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antd-lua-plugin/lib/md/md4c/md4c.c

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add markdown support
2020-09-01 17:21:21 +02:00
/*
* MD4C: Markdown parser for C
* (http://github.com/mity/md4c)
*
* Copyright (c) 2016-2020 Martin Mitas
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "md4c.h"
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*****************************
*** Miscellaneous Stuff ***
*****************************/
#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199409L
/* C89/90 or old compilers in general may not understand "inline". */
#if defined __GNUC__
#define inline __inline__
#elif defined _MSC_VER
#define inline __inline
#else
#define inline
#endif
#endif
/* Make the UTF-8 support the default. */
#if !defined MD4C_USE_ASCII && !defined MD4C_USE_UTF8 && !defined MD4C_USE_UTF16
#define MD4C_USE_UTF8
#endif
/* Magic for making wide literals with MD4C_USE_UTF16. */
#ifdef _T
#undef _T
#endif
#if defined MD4C_USE_UTF16
#define _T(x) L##x
#else
#define _T(x) x
#endif
/* Misc. macros. */
#define SIZEOF_ARRAY(a) (sizeof(a) / sizeof(a[0]))
#define STRINGIZE_(x) #x
#define STRINGIZE(x) STRINGIZE_(x)
#ifndef TRUE
#define TRUE 1
#define FALSE 0
#endif
/************************
*** Internal Types ***
************************/
/* These are omnipresent so lets save some typing. */
#define CHAR MD_CHAR
#define SZ MD_SIZE
#define OFF MD_OFFSET
typedef struct MD_MARK_tag MD_MARK;
typedef struct MD_BLOCK_tag MD_BLOCK;
typedef struct MD_CONTAINER_tag MD_CONTAINER;
typedef struct MD_REF_DEF_tag MD_REF_DEF;
/* During analyzes of inline marks, we need to manage some "mark chains",
* of (yet unresolved) openers. This structure holds start/end of the chain.
* The chain internals are then realized through MD_MARK::prev and ::next.
*/
typedef struct MD_MARKCHAIN_tag MD_MARKCHAIN;
struct MD_MARKCHAIN_tag {
int head; /* Index of first mark in the chain, or -1 if empty. */
int tail; /* Index of last mark in the chain, or -1 if empty. */
};
/* Context propagated through all the parsing. */
typedef struct MD_CTX_tag MD_CTX;
struct MD_CTX_tag {
/* Immutable stuff (parameters of md_parse()). */
const CHAR* text;
SZ size;
MD_PARSER parser;
void* userdata;
/* When this is true, it allows some optimizations. */
int doc_ends_with_newline;
/* Helper temporary growing buffer. */
CHAR* buffer;
unsigned alloc_buffer;
/* Reference definitions. */
MD_REF_DEF* ref_defs;
int n_ref_defs;
int alloc_ref_defs;
void** ref_def_hashtable;
int ref_def_hashtable_size;
/* Stack of inline/span markers.
* This is only used for parsing a single block contents but by storing it
* here we may reuse the stack for subsequent blocks; i.e. we have fewer
* (re)allocations. */
MD_MARK* marks;
int n_marks;
int alloc_marks;
#if defined MD4C_USE_UTF16
char mark_char_map[128];
#else
char mark_char_map[256];
#endif
/* For resolving of inline spans. */
MD_MARKCHAIN mark_chains[13];
#define PTR_CHAIN (ctx->mark_chains[0])
#define TABLECELLBOUNDARIES (ctx->mark_chains[1])
#define ASTERISK_OPENERS_extraword_mod3_0 (ctx->mark_chains[2])
#define ASTERISK_OPENERS_extraword_mod3_1 (ctx->mark_chains[3])
#define ASTERISK_OPENERS_extraword_mod3_2 (ctx->mark_chains[4])
#define ASTERISK_OPENERS_intraword_mod3_0 (ctx->mark_chains[5])
#define ASTERISK_OPENERS_intraword_mod3_1 (ctx->mark_chains[6])
#define ASTERISK_OPENERS_intraword_mod3_2 (ctx->mark_chains[7])
#define UNDERSCORE_OPENERS (ctx->mark_chains[8])
#define TILDE_OPENERS_1 (ctx->mark_chains[9])
#define TILDE_OPENERS_2 (ctx->mark_chains[10])
#define BRACKET_OPENERS (ctx->mark_chains[11])
#define DOLLAR_OPENERS (ctx->mark_chains[12])
#define OPENERS_CHAIN_FIRST 2
#define OPENERS_CHAIN_LAST 12
int n_table_cell_boundaries;
/* For resolving links. */
int unresolved_link_head;
int unresolved_link_tail;
/* For resolving raw HTML. */
OFF html_comment_horizon;
OFF html_proc_instr_horizon;
OFF html_decl_horizon;
OFF html_cdata_horizon;
/* For block analysis.
* Notes:
* -- It holds MD_BLOCK as well as MD_LINE structures. After each
* MD_BLOCK, its (multiple) MD_LINE(s) follow.
* -- For MD_BLOCK_HTML and MD_BLOCK_CODE, MD_VERBATIMLINE(s) are used
* instead of MD_LINE(s).
*/
void* block_bytes;
MD_BLOCK* current_block;
int n_block_bytes;
int alloc_block_bytes;
/* For container block analysis. */
MD_CONTAINER* containers;
int n_containers;
int alloc_containers;
/* Minimal indentation to call the block "indented code block". */
unsigned code_indent_offset;
/* Contextual info for line analysis. */
SZ code_fence_length; /* For checking closing fence length. */
int html_block_type; /* For checking closing raw HTML condition. */
int last_line_has_list_loosening_effect;
int last_list_item_starts_with_two_blank_lines;
};
enum MD_LINETYPE_tag {
MD_LINE_BLANK,
MD_LINE_HR,
MD_LINE_ATXHEADER,
MD_LINE_SETEXTHEADER,
MD_LINE_SETEXTUNDERLINE,
MD_LINE_INDENTEDCODE,
MD_LINE_FENCEDCODE,
MD_LINE_HTML,
MD_LINE_TEXT,
MD_LINE_TABLE,
MD_LINE_TABLEUNDERLINE
};
typedef enum MD_LINETYPE_tag MD_LINETYPE;
typedef struct MD_LINE_ANALYSIS_tag MD_LINE_ANALYSIS;
struct MD_LINE_ANALYSIS_tag {
MD_LINETYPE type : 16;
unsigned data : 16;
OFF beg;
OFF end;
unsigned indent; /* Indentation level. */
};
typedef struct MD_LINE_tag MD_LINE;
struct MD_LINE_tag {
OFF beg;
OFF end;
};
typedef struct MD_VERBATIMLINE_tag MD_VERBATIMLINE;
struct MD_VERBATIMLINE_tag {
OFF beg;
OFF end;
OFF indent;
};
/*******************
*** Debugging ***
*******************/
#define MD_LOG(msg) \
do { \
if(ctx->parser.debug_log != NULL) \
ctx->parser.debug_log((msg), ctx->userdata); \
} while(0)
#ifdef DEBUG
#define MD_ASSERT(cond) \
do { \
if(!(cond)) { \
MD_LOG(__FILE__ ":" STRINGIZE(__LINE__) ": " \
"Assertion '" STRINGIZE(cond) "' failed."); \
exit(1); \
} \
} while(0)
#define MD_UNREACHABLE() MD_ASSERT(1 == 0)
#else
#ifdef __GNUC__
#define MD_ASSERT(cond) do { if(!(cond)) __builtin_unreachable(); } while(0)
#define MD_UNREACHABLE() do { __builtin_unreachable(); } while(0)
#elif defined _MSC_VER && _MSC_VER > 120
#define MD_ASSERT(cond) do { __assume(cond); } while(0)
#define MD_UNREACHABLE() do { __assume(0); } while(0)
#else
#define MD_ASSERT(cond) do {} while(0)
#define MD_UNREACHABLE() do {} while(0)
#endif
#endif
/*****************
*** Helpers ***
*****************/
/* Character accessors. */
#define CH(off) (ctx->text[(off)])
#define STR(off) (ctx->text + (off))
/* Character classification.
* Note we assume ASCII compatibility of code points < 128 here. */
#define ISIN_(ch, ch_min, ch_max) ((ch_min) <= (unsigned)(ch) && (unsigned)(ch) <= (ch_max))
#define ISANYOF_(ch, palette) (md_strchr((palette), (ch)) != NULL)
#define ISANYOF2_(ch, ch1, ch2) ((ch) == (ch1) || (ch) == (ch2))
#define ISANYOF3_(ch, ch1, ch2, ch3) ((ch) == (ch1) || (ch) == (ch2) || (ch) == (ch3))
#define ISASCII_(ch) ((unsigned)(ch) <= 127)
#define ISBLANK_(ch) (ISANYOF2_((ch), _T(' '), _T('\t')))
#define ISNEWLINE_(ch) (ISANYOF2_((ch), _T('\r'), _T('\n')))
#define ISWHITESPACE_(ch) (ISBLANK_(ch) || ISANYOF2_((ch), _T('\v'), _T('\f')))
#define ISCNTRL_(ch) ((unsigned)(ch) <= 31 || (unsigned)(ch) == 127)
#define ISPUNCT_(ch) (ISIN_(ch, 33, 47) || ISIN_(ch, 58, 64) || ISIN_(ch, 91, 96) || ISIN_(ch, 123, 126))
#define ISUPPER_(ch) (ISIN_(ch, _T('A'), _T('Z')))
#define ISLOWER_(ch) (ISIN_(ch, _T('a'), _T('z')))
#define ISALPHA_(ch) (ISUPPER_(ch) || ISLOWER_(ch))
#define ISDIGIT_(ch) (ISIN_(ch, _T('0'), _T('9')))
#define ISXDIGIT_(ch) (ISDIGIT_(ch) || ISIN_(ch, _T('A'), _T('F')) || ISIN_(ch, _T('a'), _T('f')))
#define ISALNUM_(ch) (ISALPHA_(ch) || ISDIGIT_(ch))
#define ISANYOF(off, palette) ISANYOF_(CH(off), (palette))
#define ISANYOF2(off, ch1, ch2) ISANYOF2_(CH(off), (ch1), (ch2))
#define ISANYOF3(off, ch1, ch2, ch3) ISANYOF3_(CH(off), (ch1), (ch2), (ch3))
#define ISASCII(off) ISASCII_(CH(off))
#define ISBLANK(off) ISBLANK_(CH(off))
#define ISNEWLINE(off) ISNEWLINE_(CH(off))
#define ISWHITESPACE(off) ISWHITESPACE_(CH(off))
#define ISCNTRL(off) ISCNTRL_(CH(off))
#define ISPUNCT(off) ISPUNCT_(CH(off))
#define ISUPPER(off) ISUPPER_(CH(off))
#define ISLOWER(off) ISLOWER_(CH(off))
#define ISALPHA(off) ISALPHA_(CH(off))
#define ISDIGIT(off) ISDIGIT_(CH(off))
#define ISXDIGIT(off) ISXDIGIT_(CH(off))
#define ISALNUM(off) ISALNUM_(CH(off))
#if defined MD4C_USE_UTF16
#define md_strchr wcschr
#else
#define md_strchr strchr
#endif
/* Case insensitive check of string equality. */
static inline int
md_ascii_case_eq(const CHAR* s1, const CHAR* s2, SZ n)
{
OFF i;
for(i = 0; i < n; i++) {
CHAR ch1 = s1[i];
CHAR ch2 = s2[i];
if(ISLOWER_(ch1))
ch1 += ('A'-'a');
if(ISLOWER_(ch2))
ch2 += ('A'-'a');
if(ch1 != ch2)
return FALSE;
}
return TRUE;
}
static inline int
md_ascii_eq(const CHAR* s1, const CHAR* s2, SZ n)
{
return memcmp(s1, s2, n * sizeof(CHAR)) == 0;
}
static int
md_text_with_null_replacement(MD_CTX* ctx, MD_TEXTTYPE type, const CHAR* str, SZ size)
{
OFF off = 0;
int ret = 0;
while(1) {
while(off < size && str[off] != _T('\0'))
off++;
if(off > 0) {
ret = ctx->parser.text(type, str, off, ctx->userdata);
if(ret != 0)
return ret;
str += off;
size -= off;
off = 0;
}
if(off >= size)
return 0;
ret = ctx->parser.text(MD_TEXT_NULLCHAR, _T(""), 1, ctx->userdata);
if(ret != 0)
return ret;
off++;
}
}
#define MD_CHECK(func) \
do { \
ret = (func); \
if(ret < 0) \
goto abort; \
} while(0)
#define MD_TEMP_BUFFER(sz) \
do { \
if(sz > ctx->alloc_buffer) { \
CHAR* new_buffer; \
SZ new_size = ((sz) + (sz) / 2 + 128) & ~127; \
\
new_buffer = realloc(ctx->buffer, new_size); \
if(new_buffer == NULL) { \
MD_LOG("realloc() failed."); \
ret = -1; \
goto abort; \
} \
\
ctx->buffer = new_buffer; \
ctx->alloc_buffer = new_size; \
} \
} while(0)
#define MD_ENTER_BLOCK(type, arg) \
do { \
ret = ctx->parser.enter_block((type), (arg), ctx->userdata); \
if(ret != 0) { \
MD_LOG("Aborted from enter_block() callback."); \
goto abort; \
} \
} while(0)
#define MD_LEAVE_BLOCK(type, arg) \
do { \
ret = ctx->parser.leave_block((type), (arg), ctx->userdata); \
if(ret != 0) { \
MD_LOG("Aborted from leave_block() callback."); \
goto abort; \
} \
} while(0)
#define MD_ENTER_SPAN(type, arg) \
do { \
ret = ctx->parser.enter_span((type), (arg), ctx->userdata); \
if(ret != 0) { \
MD_LOG("Aborted from enter_span() callback."); \
goto abort; \
} \
} while(0)
#define MD_LEAVE_SPAN(type, arg) \
do { \
ret = ctx->parser.leave_span((type), (arg), ctx->userdata); \
if(ret != 0) { \
MD_LOG("Aborted from leave_span() callback."); \
goto abort; \
} \
} while(0)
#define MD_TEXT(type, str, size) \
do { \
if(size > 0) { \
ret = ctx->parser.text((type), (str), (size), ctx->userdata); \
if(ret != 0) { \
MD_LOG("Aborted from text() callback."); \
goto abort; \
} \
} \
} while(0)
#define MD_TEXT_INSECURE(type, str, size) \
do { \
if(size > 0) { \
ret = md_text_with_null_replacement(ctx, type, str, size); \
if(ret != 0) { \
MD_LOG("Aborted from text() callback."); \
goto abort; \
} \
} \
} while(0)
/*************************
*** Unicode Support ***
*************************/
typedef struct MD_UNICODE_FOLD_INFO_tag MD_UNICODE_FOLD_INFO;
struct MD_UNICODE_FOLD_INFO_tag {
unsigned codepoints[3];
int n_codepoints;
};
#if defined MD4C_USE_UTF16 || defined MD4C_USE_UTF8
/* Binary search over sorted "map" of codepoints. Consecutive sequences
* of codepoints may be encoded in the map by just using the
* (MIN_CODEPOINT | 0x40000000) and (MAX_CODEPOINT | 0x80000000).
*
* Returns index of the found record in the map (in the case of ranges,
* the minimal value is used); or -1 on failure. */
static int
md_unicode_bsearch__(unsigned codepoint, const unsigned* map, size_t map_size)
{
int beg, end;
int pivot_beg, pivot_end;
beg = 0;
end = (int) map_size-1;
while(beg <= end) {
/* Pivot may be a range, not just a single value. */
pivot_beg = pivot_end = (beg + end) / 2;
if(map[pivot_end] & 0x40000000)
pivot_end++;
if(map[pivot_beg] & 0x80000000)
pivot_beg--;
if(codepoint < (map[pivot_beg] & 0x00ffffff))
end = pivot_beg - 1;
else if(codepoint > (map[pivot_end] & 0x00ffffff))
beg = pivot_end + 1;
else
return pivot_beg;
}
return -1;
}
static int
md_is_unicode_whitespace__(unsigned codepoint)
{
#define R(cp_min, cp_max) ((cp_min) | 0x40000000), ((cp_max) | 0x80000000)
#define S(cp) (cp)
/* Unicode "Zs" category.
* (generated by scripts/build_whitespace_map.py) */
static const unsigned WHITESPACE_MAP[] = {
S(0x0020), S(0x00a0), S(0x1680), R(0x2000,0x200a), S(0x202f), S(0x205f), S(0x3000)
};
#undef R
#undef S
/* The ASCII ones are the most frequently used ones, also CommonMark
* specification requests few more in this range. */
if(codepoint <= 0x7f)
return ISWHITESPACE_(codepoint);
return (md_unicode_bsearch__(codepoint, WHITESPACE_MAP, SIZEOF_ARRAY(WHITESPACE_MAP)) >= 0);
}
static int
md_is_unicode_punct__(unsigned codepoint)
{
#define R(cp_min, cp_max) ((cp_min) | 0x40000000), ((cp_max) | 0x80000000)
#define S(cp) (cp)
/* Unicode "Pc", "Pd", "Pe", "Pf", "Pi", "Po", "Ps" categories.
* (generated by scripts/build_punct_map.py) */
static const unsigned PUNCT_MAP[] = {
R(0x0021,0x0023), R(0x0025,0x002a), R(0x002c,0x002f), R(0x003a,0x003b), R(0x003f,0x0040),
R(0x005b,0x005d), S(0x005f), S(0x007b), S(0x007d), S(0x00a1), S(0x00a7), S(0x00ab), R(0x00b6,0x00b7),
S(0x00bb), S(0x00bf), S(0x037e), S(0x0387), R(0x055a,0x055f), R(0x0589,0x058a), S(0x05be), S(0x05c0),
S(0x05c3), S(0x05c6), R(0x05f3,0x05f4), R(0x0609,0x060a), R(0x060c,0x060d), S(0x061b), R(0x061e,0x061f),
R(0x066a,0x066d), S(0x06d4), R(0x0700,0x070d), R(0x07f7,0x07f9), R(0x0830,0x083e), S(0x085e),
R(0x0964,0x0965), S(0x0970), S(0x09fd), S(0x0a76), S(0x0af0), S(0x0c77), S(0x0c84), S(0x0df4), S(0x0e4f),
R(0x0e5a,0x0e5b), R(0x0f04,0x0f12), S(0x0f14), R(0x0f3a,0x0f3d), S(0x0f85), R(0x0fd0,0x0fd4),
R(0x0fd9,0x0fda), R(0x104a,0x104f), S(0x10fb), R(0x1360,0x1368), S(0x1400), S(0x166e), R(0x169b,0x169c),
R(0x16eb,0x16ed), R(0x1735,0x1736), R(0x17d4,0x17d6), R(0x17d8,0x17da), R(0x1800,0x180a),
R(0x1944,0x1945), R(0x1a1e,0x1a1f), R(0x1aa0,0x1aa6), R(0x1aa8,0x1aad), R(0x1b5a,0x1b60),
R(0x1bfc,0x1bff), R(0x1c3b,0x1c3f), R(0x1c7e,0x1c7f), R(0x1cc0,0x1cc7), S(0x1cd3), R(0x2010,0x2027),
R(0x2030,0x2043), R(0x2045,0x2051), R(0x2053,0x205e), R(0x207d,0x207e), R(0x208d,0x208e),
R(0x2308,0x230b), R(0x2329,0x232a), R(0x2768,0x2775), R(0x27c5,0x27c6), R(0x27e6,0x27ef),
R(0x2983,0x2998), R(0x29d8,0x29db), R(0x29fc,0x29fd), R(0x2cf9,0x2cfc), R(0x2cfe,0x2cff), S(0x2d70),
R(0x2e00,0x2e2e), R(0x2e30,0x2e4f), S(0x2e52), R(0x3001,0x3003), R(0x3008,0x3011), R(0x3014,0x301f),
S(0x3030), S(0x303d), S(0x30a0), S(0x30fb), R(0xa4fe,0xa4ff), R(0xa60d,0xa60f), S(0xa673), S(0xa67e),
R(0xa6f2,0xa6f7), R(0xa874,0xa877), R(0xa8ce,0xa8cf), R(0xa8f8,0xa8fa), S(0xa8fc), R(0xa92e,0xa92f),
S(0xa95f), R(0xa9c1,0xa9cd), R(0xa9de,0xa9df), R(0xaa5c,0xaa5f), R(0xaade,0xaadf), R(0xaaf0,0xaaf1),
S(0xabeb), R(0xfd3e,0xfd3f), R(0xfe10,0xfe19), R(0xfe30,0xfe52), R(0xfe54,0xfe61), S(0xfe63), S(0xfe68),
R(0xfe6a,0xfe6b), R(0xff01,0xff03), R(0xff05,0xff0a), R(0xff0c,0xff0f), R(0xff1a,0xff1b),
R(0xff1f,0xff20), R(0xff3b,0xff3d), S(0xff3f), S(0xff5b), S(0xff5d), R(0xff5f,0xff65), R(0x10100,0x10102),
S(0x1039f), S(0x103d0), S(0x1056f), S(0x10857), S(0x1091f), S(0x1093f), R(0x10a50,0x10a58), S(0x10a7f),
R(0x10af0,0x10af6), R(0x10b39,0x10b3f), R(0x10b99,0x10b9c), S(0x10ead), R(0x10f55,0x10f59),
R(0x11047,0x1104d), R(0x110bb,0x110bc), R(0x110be,0x110c1), R(0x11140,0x11143), R(0x11174,0x11175),
R(0x111c5,0x111c8), S(0x111cd), S(0x111db), R(0x111dd,0x111df), R(0x11238,0x1123d), S(0x112a9),
R(0x1144b,0x1144f), R(0x1145a,0x1145b), S(0x1145d), S(0x114c6), R(0x115c1,0x115d7), R(0x11641,0x11643),
R(0x11660,0x1166c), R(0x1173c,0x1173e), S(0x1183b), R(0x11944,0x11946), S(0x119e2), R(0x11a3f,0x11a46),
R(0x11a9a,0x11a9c), R(0x11a9e,0x11aa2), R(0x11c41,0x11c45), R(0x11c70,0x11c71), R(0x11ef7,0x11ef8),
S(0x11fff), R(0x12470,0x12474), R(0x16a6e,0x16a6f), S(0x16af5), R(0x16b37,0x16b3b), S(0x16b44),
R(0x16e97,0x16e9a), S(0x16fe2), S(0x1bc9f), R(0x1da87,0x1da8b), R(0x1e95e,0x1e95f)
};
#undef R
#undef S
/* The ASCII ones are the most frequently used ones, also CommonMark
* specification requests few more in this range. */
if(codepoint <= 0x7f)
return ISPUNCT_(codepoint);
return (md_unicode_bsearch__(codepoint, PUNCT_MAP, SIZEOF_ARRAY(PUNCT_MAP)) >= 0);
}
static void
md_get_unicode_fold_info(unsigned codepoint, MD_UNICODE_FOLD_INFO* info)
{
#define R(cp_min, cp_max) ((cp_min) | 0x40000000), ((cp_max) | 0x80000000)
#define S(cp) (cp)
/* Unicode "Pc", "Pd", "Pe", "Pf", "Pi", "Po", "Ps" categories.
* (generated by scripts/build_punct_map.py) */
static const unsigned FOLD_MAP_1[] = {
R(0x0041,0x005a), S(0x00b5), R(0x00c0,0x00d6), R(0x00d8,0x00de), R(0x0100,0x012e), R(0x0132,0x0136),
R(0x0139,0x0147), R(0x014a,0x0176), S(0x0178), R(0x0179,0x017d), S(0x017f), S(0x0181), S(0x0182),
S(0x0184), S(0x0186), S(0x0187), S(0x0189), S(0x018a), S(0x018b), S(0x018e), S(0x018f), S(0x0190),
S(0x0191), S(0x0193), S(0x0194), S(0x0196), S(0x0197), S(0x0198), S(0x019c), S(0x019d), S(0x019f),
R(0x01a0,0x01a4), S(0x01a6), S(0x01a7), S(0x01a9), S(0x01ac), S(0x01ae), S(0x01af), S(0x01b1), S(0x01b2),
S(0x01b3), S(0x01b5), S(0x01b7), S(0x01b8), S(0x01bc), S(0x01c4), S(0x01c5), S(0x01c7), S(0x01c8),
S(0x01ca), R(0x01cb,0x01db), R(0x01de,0x01ee), S(0x01f1), S(0x01f2), S(0x01f4), S(0x01f6), S(0x01f7),
R(0x01f8,0x021e), S(0x0220), R(0x0222,0x0232), S(0x023a), S(0x023b), S(0x023d), S(0x023e), S(0x0241),
S(0x0243), S(0x0244), S(0x0245), R(0x0246,0x024e), S(0x0345), S(0x0370), S(0x0372), S(0x0376), S(0x037f),
S(0x0386), R(0x0388,0x038a), S(0x038c), S(0x038e), S(0x038f), R(0x0391,0x03a1), R(0x03a3,0x03ab),
S(0x03c2), S(0x03cf), S(0x03d0), S(0x03d1), S(0x03d5), S(0x03d6), R(0x03d8,0x03ee), S(0x03f0), S(0x03f1),
S(0x03f4), S(0x03f5), S(0x03f7), S(0x03f9), S(0x03fa), R(0x03fd,0x03ff), R(0x0400,0x040f),
R(0x0410,0x042f), R(0x0460,0x0480), R(0x048a,0x04be), S(0x04c0), R(0x04c1,0x04cd), R(0x04d0,0x052e),
R(0x0531,0x0556), R(0x10a0,0x10c5), S(0x10c7), S(0x10cd), R(0x13f8,0x13fd), S(0x1c80), S(0x1c81),
S(0x1c82), S(0x1c83), S(0x1c84), S(0x1c85), S(0x1c86), S(0x1c87), S(0x1c88), R(0x1c90,0x1cba),
R(0x1cbd,0x1cbf), R(0x1e00,0x1e94), S(0x1e9b), R(0x1ea0,0x1efe), R(0x1f08,0x1f0f), R(0x1f18,0x1f1d),
R(0x1f28,0x1f2f), R(0x1f38,0x1f3f), R(0x1f48,0x1f4d), S(0x1f59), S(0x1f5b), S(0x1f5d), S(0x1f5f),
R(0x1f68,0x1f6f), S(0x1fb8), S(0x1fb9), S(0x1fba), S(0x1fbb), S(0x1fbe), R(0x1fc8,0x1fcb), S(0x1fd8),
S(0x1fd9), S(0x1fda), S(0x1fdb), S(0x1fe8), S(0x1fe9), S(0x1fea), S(0x1feb), S(0x1fec), S(0x1ff8),
S(0x1ff9), S(0x1ffa), S(0x1ffb), S(0x2126), S(0x212a), S(0x212b), S(0x2132), R(0x2160,0x216f), S(0x2183),
R(0x24b6,0x24cf), R(0x2c00,0x2c2e), S(0x2c60), S(0x2c62), S(0x2c63), S(0x2c64), R(0x2c67,0x2c6b),
S(0x2c6d), S(0x2c6e), S(0x2c6f), S(0x2c70), S(0x2c72), S(0x2c75), S(0x2c7e), S(0x2c7f), R(0x2c80,0x2ce2),
S(0x2ceb), S(0x2ced), S(0x2cf2), R(0xa640,0xa66c), R(0xa680,0xa69a), R(0xa722,0xa72e), R(0xa732,0xa76e),
S(0xa779), S(0xa77b), S(0xa77d), R(0xa77e,0xa786), S(0xa78b), S(0xa78d), S(0xa790), S(0xa792),
R(0xa796,0xa7a8), S(0xa7aa), S(0xa7ab), S(0xa7ac), S(0xa7ad), S(0xa7ae), S(0xa7b0), S(0xa7b1), S(0xa7b2),
S(0xa7b3), R(0xa7b4,0xa7be), S(0xa7c2), S(0xa7c4), S(0xa7c5), S(0xa7c6), S(0xa7c7), S(0xa7c9), S(0xa7f5),
R(0xab70,0xabbf), R(0xff21,0xff3a), R(0x10400,0x10427), R(0x104b0,0x104d3), R(0x10c80,0x10cb2),
R(0x118a0,0x118bf), R(0x16e40,0x16e5f), R(0x1e900,0x1e921)
};
static const unsigned FOLD_MAP_1_DATA[] = {
0x0061, 0x007a, 0x03bc, 0x00e0, 0x00f6, 0x00f8, 0x00fe, 0x0101, 0x012f, 0x0133, 0x0137, 0x013a, 0x0148,
0x014b, 0x0177, 0x00ff, 0x017a, 0x017e, 0x0073, 0x0253, 0x0183, 0x0185, 0x0254, 0x0188, 0x0256, 0x0257,
0x018c, 0x01dd, 0x0259, 0x025b, 0x0192, 0x0260, 0x0263, 0x0269, 0x0268, 0x0199, 0x026f, 0x0272, 0x0275,
0x01a1, 0x01a5, 0x0280, 0x01a8, 0x0283, 0x01ad, 0x0288, 0x01b0, 0x028a, 0x028b, 0x01b4, 0x01b6, 0x0292,
0x01b9, 0x01bd, 0x01c6, 0x01c6, 0x01c9, 0x01c9, 0x01cc, 0x01cc, 0x01dc, 0x01df, 0x01ef, 0x01f3, 0x01f3,
0x01f5, 0x0195, 0x01bf, 0x01f9, 0x021f, 0x019e, 0x0223, 0x0233, 0x2c65, 0x023c, 0x019a, 0x2c66, 0x0242,
0x0180, 0x0289, 0x028c, 0x0247, 0x024f, 0x03b9, 0x0371, 0x0373, 0x0377, 0x03f3, 0x03ac, 0x03ad, 0x03af,
0x03cc, 0x03cd, 0x03ce, 0x03b1, 0x03c1, 0x03c3, 0x03cb, 0x03c3, 0x03d7, 0x03b2, 0x03b8, 0x03c6, 0x03c0,
0x03d9, 0x03ef, 0x03ba, 0x03c1, 0x03b8, 0x03b5, 0x03f8, 0x03f2, 0x03fb, 0x037b, 0x037d, 0x0450, 0x045f,
0x0430, 0x044f, 0x0461, 0x0481, 0x048b, 0x04bf, 0x04cf, 0x04c2, 0x04ce, 0x04d1, 0x052f, 0x0561, 0x0586,
0x2d00, 0x2d25, 0x2d27, 0x2d2d, 0x13f0, 0x13f5, 0x0432, 0x0434, 0x043e, 0x0441, 0x0442, 0x0442, 0x044a,
0x0463, 0xa64b, 0x10d0, 0x10fa, 0x10fd, 0x10ff, 0x1e01, 0x1e95, 0x1e61, 0x1ea1, 0x1eff, 0x1f00, 0x1f07,
0x1f10, 0x1f15, 0x1f20, 0x1f27, 0x1f30, 0x1f37, 0x1f40, 0x1f45, 0x1f51, 0x1f53, 0x1f55, 0x1f57, 0x1f60,
0x1f67, 0x1fb0, 0x1fb1, 0x1f70, 0x1f71, 0x03b9, 0x1f72, 0x1f75, 0x1fd0, 0x1fd1, 0x1f76, 0x1f77, 0x1fe0,
0x1fe1, 0x1f7a, 0x1f7b, 0x1fe5, 0x1f78, 0x1f79, 0x1f7c, 0x1f7d, 0x03c9, 0x006b, 0x00e5, 0x214e, 0x2170,
0x217f, 0x2184, 0x24d0, 0x24e9, 0x2c30, 0x2c5e, 0x2c61, 0x026b, 0x1d7d, 0x027d, 0x2c68, 0x2c6c, 0x0251,
0x0271, 0x0250, 0x0252, 0x2c73, 0x2c76, 0x023f, 0x0240, 0x2c81, 0x2ce3, 0x2cec, 0x2cee, 0x2cf3, 0xa641,
0xa66d, 0xa681, 0xa69b, 0xa723, 0xa72f, 0xa733, 0xa76f, 0xa77a, 0xa77c, 0x1d79, 0xa77f, 0xa787, 0xa78c,
0x0265, 0xa791, 0xa793, 0xa797, 0xa7a9, 0x0266, 0x025c, 0x0261, 0x026c, 0x026a, 0x029e, 0x0287, 0x029d,
0xab53, 0xa7b5, 0xa7bf, 0xa7c3, 0xa794, 0x0282, 0x1d8e, 0xa7c8, 0xa7ca, 0xa7f6, 0x13a0, 0x13ef, 0xff41,
0xff5a, 0x10428, 0x1044f, 0x104d8, 0x104fb, 0x10cc0, 0x10cf2, 0x118c0, 0x118df, 0x16e60, 0x16e7f, 0x1e922,
0x1e943
};
static const unsigned FOLD_MAP_2[] = {
S(0x00df), S(0x0130), S(0x0149), S(0x01f0), S(0x0587), S(0x1e96), S(0x1e97), S(0x1e98), S(0x1e99),
S(0x1e9a), S(0x1e9e), S(0x1f50), R(0x1f80,0x1f87), R(0x1f88,0x1f8f), R(0x1f90,0x1f97), R(0x1f98,0x1f9f),
R(0x1fa0,0x1fa7), R(0x1fa8,0x1faf), S(0x1fb2), S(0x1fb3), S(0x1fb4), S(0x1fb6), S(0x1fbc), S(0x1fc2),
S(0x1fc3), S(0x1fc4), S(0x1fc6), S(0x1fcc), S(0x1fd6), S(0x1fe4), S(0x1fe6), S(0x1ff2), S(0x1ff3),
S(0x1ff4), S(0x1ff6), S(0x1ffc), S(0xfb00), S(0xfb01), S(0xfb02), S(0xfb05), S(0xfb06), S(0xfb13),
S(0xfb14), S(0xfb15), S(0xfb16), S(0xfb17)
};
static const unsigned FOLD_MAP_2_DATA[] = {
0x0073,0x0073, 0x0069,0x0307, 0x02bc,0x006e, 0x006a,0x030c, 0x0565,0x0582, 0x0068,0x0331, 0x0074,0x0308,
0x0077,0x030a, 0x0079,0x030a, 0x0061,0x02be, 0x0073,0x0073, 0x03c5,0x0313, 0x1f00,0x03b9, 0x1f07,0x03b9,
0x1f00,0x03b9, 0x1f07,0x03b9, 0x1f20,0x03b9, 0x1f27,0x03b9, 0x1f20,0x03b9, 0x1f27,0x03b9, 0x1f60,0x03b9,
0x1f67,0x03b9, 0x1f60,0x03b9, 0x1f67,0x03b9, 0x1f70,0x03b9, 0x03b1,0x03b9, 0x03ac,0x03b9, 0x03b1,0x0342,
0x03b1,0x03b9, 0x1f74,0x03b9, 0x03b7,0x03b9, 0x03ae,0x03b9, 0x03b7,0x0342, 0x03b7,0x03b9, 0x03b9,0x0342,
0x03c1,0x0313, 0x03c5,0x0342, 0x1f7c,0x03b9, 0x03c9,0x03b9, 0x03ce,0x03b9, 0x03c9,0x0342, 0x03c9,0x03b9,
0x0066,0x0066, 0x0066,0x0069, 0x0066,0x006c, 0x0073,0x0074, 0x0073,0x0074, 0x0574,0x0576, 0x0574,0x0565,
0x0574,0x056b, 0x057e,0x0576, 0x0574,0x056d
};
static const unsigned FOLD_MAP_3[] = {
S(0x0390), S(0x03b0), S(0x1f52), S(0x1f54), S(0x1f56), S(0x1fb7), S(0x1fc7), S(0x1fd2), S(0x1fd3),
S(0x1fd7), S(0x1fe2), S(0x1fe3), S(0x1fe7), S(0x1ff7), S(0xfb03), S(0xfb04)
};
static const unsigned FOLD_MAP_3_DATA[] = {
0x03b9,0x0308,0x0301, 0x03c5,0x0308,0x0301, 0x03c5,0x0313,0x0300, 0x03c5,0x0313,0x0301,
0x03c5,0x0313,0x0342, 0x03b1,0x0342,0x03b9, 0x03b7,0x0342,0x03b9, 0x03b9,0x0308,0x0300,
0x03b9,0x0308,0x0301, 0x03b9,0x0308,0x0342, 0x03c5,0x0308,0x0300, 0x03c5,0x0308,0x0301,
0x03c5,0x0308,0x0342, 0x03c9,0x0342,0x03b9, 0x0066,0x0066,0x0069, 0x0066,0x0066,0x006c
};
#undef R
#undef S
static const struct {
const unsigned* map;
const unsigned* data;
size_t map_size;
int n_codepoints;
} FOLD_MAP_LIST[] = {
{ FOLD_MAP_1, FOLD_MAP_1_DATA, SIZEOF_ARRAY(FOLD_MAP_1), 1 },
{ FOLD_MAP_2, FOLD_MAP_2_DATA, SIZEOF_ARRAY(FOLD_MAP_2), 2 },
{ FOLD_MAP_3, FOLD_MAP_3_DATA, SIZEOF_ARRAY(FOLD_MAP_3), 3 }
};
int i;
/* Fast path for ASCII characters. */
if(codepoint <= 0x7f) {
info->codepoints[0] = codepoint;
if(ISUPPER_(codepoint))
info->codepoints[0] += 'a' - 'A';
info->n_codepoints = 1;
return;
}
/* Try to locate the codepoint in any of the maps. */
for(i = 0; i < (int) SIZEOF_ARRAY(FOLD_MAP_LIST); i++) {
int index;
index = md_unicode_bsearch__(codepoint, FOLD_MAP_LIST[i].map, FOLD_MAP_LIST[i].map_size);
if(index >= 0) {
/* Found the mapping. */
int n_codepoints = FOLD_MAP_LIST[i].n_codepoints;
const unsigned* map = FOLD_MAP_LIST[i].map;
const unsigned* codepoints = FOLD_MAP_LIST[i].data + (index * n_codepoints);
memcpy(info->codepoints, codepoints, sizeof(unsigned) * n_codepoints);
info->n_codepoints = n_codepoints;
if(FOLD_MAP_LIST[i].map[index] != codepoint) {
/* The found mapping maps whole range of codepoints,
* i.e. we have to offset info->codepoints[0] accordingly. */
if((map[index] & 0x00ffffff)+1 == codepoints[0]) {
/* Alternating type of the range. */
info->codepoints[0] = codepoint + ((codepoint & 0x1) == (map[index] & 0x1) ? 1 : 0);
} else {
/* Range to range kind of mapping. */
info->codepoints[0] += (codepoint - (map[index] & 0x00ffffff));
}
}
return;
}
}
/* No mapping found. Map the codepoint to itself. */
info->codepoints[0] = codepoint;
info->n_codepoints = 1;
}
#endif
#if defined MD4C_USE_UTF16
#define IS_UTF16_SURROGATE_HI(word) (((WORD)(word) & 0xfc00) == 0xd800)
#define IS_UTF16_SURROGATE_LO(word) (((WORD)(word) & 0xfc00) == 0xdc00)
#define UTF16_DECODE_SURROGATE(hi, lo) (0x10000 + ((((unsigned)(hi) & 0x3ff) << 10) | (((unsigned)(lo) & 0x3ff) << 0)))
static unsigned
md_decode_utf16le__(const CHAR* str, SZ str_size, SZ* p_size)
{
if(IS_UTF16_SURROGATE_HI(str[0])) {
if(1 < str_size && IS_UTF16_SURROGATE_LO(str[1])) {
if(p_size != NULL)
*p_size = 2;
return UTF16_DECODE_SURROGATE(str[0], str[1]);
}
}
if(p_size != NULL)
*p_size = 1;
return str[0];
}
static unsigned
md_decode_utf16le_before__(MD_CTX* ctx, OFF off)
{
if(off > 2 && IS_UTF16_SURROGATE_HI(CH(off-2)) && IS_UTF16_SURROGATE_LO(CH(off-1)))
return UTF16_DECODE_SURROGATE(CH(off-2), CH(off-1));
return CH(off);
}
/* No whitespace uses surrogates, so no decoding needed here. */
#define ISUNICODEWHITESPACE_(codepoint) md_is_unicode_whitespace__(codepoint)
#define ISUNICODEWHITESPACE(off) md_is_unicode_whitespace__(CH(off))
#define ISUNICODEWHITESPACEBEFORE(off) md_is_unicode_whitespace__(CH((off)-1))
#define ISUNICODEPUNCT(off) md_is_unicode_punct__(md_decode_utf16le__(STR(off), ctx->size - (off), NULL))
#define ISUNICODEPUNCTBEFORE(off) md_is_unicode_punct__(md_decode_utf16le_before__(ctx, off))
static inline int
md_decode_unicode(const CHAR* str, OFF off, SZ str_size, SZ* p_char_size)
{
return md_decode_utf16le__(str+off, str_size-off, p_char_size);
}
#elif defined MD4C_USE_UTF8
#define IS_UTF8_LEAD1(byte) ((unsigned char)(byte) <= 0x7f)
#define IS_UTF8_LEAD2(byte) (((unsigned char)(byte) & 0xe0) == 0xc0)
#define IS_UTF8_LEAD3(byte) (((unsigned char)(byte) & 0xf0) == 0xe0)
#define IS_UTF8_LEAD4(byte) (((unsigned char)(byte) & 0xf8) == 0xf0)
#define IS_UTF8_TAIL(byte) (((unsigned char)(byte) & 0xc0) == 0x80)
static unsigned
md_decode_utf8__(const CHAR* str, SZ str_size, SZ* p_size)
{
if(!IS_UTF8_LEAD1(str[0])) {
if(IS_UTF8_LEAD2(str[0])) {
if(1 < str_size && IS_UTF8_TAIL(str[1])) {
if(p_size != NULL)
*p_size = 2;
return (((unsigned int)str[0] & 0x1f) << 6) |
(((unsigned int)str[1] & 0x3f) << 0);
}
} else if(IS_UTF8_LEAD3(str[0])) {
if(2 < str_size && IS_UTF8_TAIL(str[1]) && IS_UTF8_TAIL(str[2])) {
if(p_size != NULL)
*p_size = 3;
return (((unsigned int)str[0] & 0x0f) << 12) |
(((unsigned int)str[1] & 0x3f) << 6) |
(((unsigned int)str[2] & 0x3f) << 0);
}
} else if(IS_UTF8_LEAD4(str[0])) {
if(3 < str_size && IS_UTF8_TAIL(str[1]) && IS_UTF8_TAIL(str[2]) && IS_UTF8_TAIL(str[3])) {
if(p_size != NULL)
*p_size = 4;
return (((unsigned int)str[0] & 0x07) << 18) |
(((unsigned int)str[1] & 0x3f) << 12) |
(((unsigned int)str[2] & 0x3f) << 6) |
(((unsigned int)str[3] & 0x3f) << 0);
}
}
}
if(p_size != NULL)
*p_size = 1;
return (unsigned) str[0];
}
static unsigned
md_decode_utf8_before__(MD_CTX* ctx, OFF off)
{
if(!IS_UTF8_LEAD1(CH(off-1))) {
if(off > 1 && IS_UTF8_LEAD2(CH(off-2)) && IS_UTF8_TAIL(CH(off-1)))
return (((unsigned int)CH(off-2) & 0x1f) << 6) |
(((unsigned int)CH(off-1) & 0x3f) << 0);
if(off > 2 && IS_UTF8_LEAD3(CH(off-3)) && IS_UTF8_TAIL(CH(off-2)) && IS_UTF8_TAIL(CH(off-1)))
return (((unsigned int)CH(off-3) & 0x0f) << 12) |
(((unsigned int)CH(off-2) & 0x3f) << 6) |
(((unsigned int)CH(off-1) & 0x3f) << 0);
if(off > 3 && IS_UTF8_LEAD4(CH(off-4)) && IS_UTF8_TAIL(CH(off-3)) && IS_UTF8_TAIL(CH(off-2)) && IS_UTF8_TAIL(CH(off-1)))
return (((unsigned int)CH(off-4) & 0x07) << 18) |
(((unsigned int)CH(off-3) & 0x3f) << 12) |
(((unsigned int)CH(off-2) & 0x3f) << 6) |
(((unsigned int)CH(off-1) & 0x3f) << 0);
}
return (unsigned) CH(off-1);
}
#define ISUNICODEWHITESPACE_(codepoint) md_is_unicode_whitespace__(codepoint)
#define ISUNICODEWHITESPACE(off) md_is_unicode_whitespace__(md_decode_utf8__(STR(off), ctx->size - (off), NULL))
#define ISUNICODEWHITESPACEBEFORE(off) md_is_unicode_whitespace__(md_decode_utf8_before__(ctx, off))
#define ISUNICODEPUNCT(off) md_is_unicode_punct__(md_decode_utf8__(STR(off), ctx->size - (off), NULL))
#define ISUNICODEPUNCTBEFORE(off) md_is_unicode_punct__(md_decode_utf8_before__(ctx, off))
static inline unsigned
md_decode_unicode(const CHAR* str, OFF off, SZ str_size, SZ* p_char_size)
{
return md_decode_utf8__(str+off, str_size-off, p_char_size);
}
#else
#define ISUNICODEWHITESPACE_(codepoint) ISWHITESPACE_(codepoint)
#define ISUNICODEWHITESPACE(off) ISWHITESPACE(off)
#define ISUNICODEWHITESPACEBEFORE(off) ISWHITESPACE((off)-1)
#define ISUNICODEPUNCT(off) ISPUNCT(off)
#define ISUNICODEPUNCTBEFORE(off) ISPUNCT((off)-1)
static inline void
md_get_unicode_fold_info(unsigned codepoint, MD_UNICODE_FOLD_INFO* info)
{
info->codepoints[0] = codepoint;
if(ISUPPER_(codepoint))
info->codepoints[0] += 'a' - 'A';
info->n_codepoints = 1;
}
static inline unsigned
md_decode_unicode(const CHAR* str, OFF off, SZ str_size, SZ* p_size)
{
*p_size = 1;
return (unsigned) str[off];
}
#endif
/*************************************
*** Helper string manipulations ***
*************************************/
/* Fill buffer with copy of the string between 'beg' and 'end' but replace any
* line breaks with given replacement character.
*
* NOTE: Caller is responsible to make sure the buffer is large enough.
* (Given the output is always shorter then input, (end - beg) is good idea
* what the caller should allocate.)
*/
static void
md_merge_lines(MD_CTX* ctx, OFF beg, OFF end, const MD_LINE* lines, int n_lines,
CHAR line_break_replacement_char, CHAR* buffer, SZ* p_size)
{
CHAR* ptr = buffer;
int line_index = 0;
OFF off = beg;
while(1) {
const MD_LINE* line = &lines[line_index];
OFF line_end = line->end;
if(end < line_end)
line_end = end;
while(off < line_end) {
*ptr = CH(off);
ptr++;
off++;
}
if(off >= end) {
*p_size = ptr - buffer;
return;
}
*ptr = line_break_replacement_char;
ptr++;
line_index++;
off = lines[line_index].beg;
}
}
/* Wrapper of md_merge_lines() which allocates new buffer for the output string.
*/
static int
md_merge_lines_alloc(MD_CTX* ctx, OFF beg, OFF end, const MD_LINE* lines, int n_lines,
CHAR line_break_replacement_char, CHAR** p_str, SZ* p_size)
{
CHAR* buffer;
buffer = (CHAR*) malloc(sizeof(CHAR) * (end - beg));
if(buffer == NULL) {
MD_LOG("malloc() failed.");
return -1;
}
md_merge_lines(ctx, beg, end, lines, n_lines,
line_break_replacement_char, buffer, p_size);
*p_str = buffer;
return 0;
}
static OFF
md_skip_unicode_whitespace(const CHAR* label, OFF off, SZ size)
{
SZ char_size;
unsigned codepoint;
while(off < size) {
codepoint = md_decode_unicode(label, off, size, &char_size);
if(!ISUNICODEWHITESPACE_(codepoint) && !ISNEWLINE_(label[off]))
break;
off += char_size;
}
return off;
}
/******************************
*** Recognizing raw HTML ***
******************************/
/* md_is_html_tag() may be called when processing inlines (inline raw HTML)
* or when breaking document to blocks (checking for start of HTML block type 7).
*
* When breaking document to blocks, we do not yet know line boundaries, but
* in that case the whole tag has to live on a single line. We distinguish this
* by n_lines == 0.
*/
static int
md_is_html_tag(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, OFF max_end, OFF* p_end)
{
int attr_state;
OFF off = beg;
OFF line_end = (n_lines > 0) ? lines[0].end : ctx->size;
int i = 0;
MD_ASSERT(CH(beg) == _T('<'));
if(off + 1 >= line_end)
return FALSE;
off++;
/* For parsing attributes, we need a little state automaton below.
* State -1: no attributes are allowed.
* State 0: attribute could follow after some whitespace.
* State 1: after a whitespace (attribute name may follow).
* State 2: after attribute name ('=' MAY follow).
* State 3: after '=' (value specification MUST follow).
* State 41: in middle of unquoted attribute value.
* State 42: in middle of single-quoted attribute value.
* State 43: in middle of double-quoted attribute value.
*/
attr_state = 0;
if(CH(off) == _T('/')) {
/* Closer tag "</ ... >". No attributes may be present. */
attr_state = -1;
off++;
}
/* Tag name */
if(off >= line_end || !ISALPHA(off))
return FALSE;
off++;
while(off < line_end && (ISALNUM(off) || CH(off) == _T('-')))
off++;
/* (Optional) attributes (if not closer), (optional) '/' (if not closer)
* and final '>'. */
while(1) {
while(off < line_end && !ISNEWLINE(off)) {
if(attr_state > 40) {
if(attr_state == 41 && (ISBLANK(off) || ISANYOF(off, _T("\"'=<>`")))) {
attr_state = 0;
off--; /* Put the char back for re-inspection in the new state. */
} else if(attr_state == 42 && CH(off) == _T('\'')) {
attr_state = 0;
} else if(attr_state == 43 && CH(off) == _T('"')) {
attr_state = 0;
}
off++;
} else if(ISWHITESPACE(off)) {
if(attr_state == 0)
attr_state = 1;
off++;
} else if(attr_state <= 2 && CH(off) == _T('>')) {
/* End. */
goto done;
} else if(attr_state <= 2 && CH(off) == _T('/') && off+1 < line_end && CH(off+1) == _T('>')) {
/* End with digraph '/>' */
off++;
goto done;
} else if((attr_state == 1 || attr_state == 2) && (ISALPHA(off) || CH(off) == _T('_') || CH(off) == _T(':'))) {
off++;
/* Attribute name */
while(off < line_end && (ISALNUM(off) || ISANYOF(off, _T("_.:-"))))
off++;
attr_state = 2;
} else if(attr_state == 2 && CH(off) == _T('=')) {
/* Attribute assignment sign */
off++;
attr_state = 3;
} else if(attr_state == 3) {
/* Expecting start of attribute value. */
if(CH(off) == _T('"'))
attr_state = 43;
else if(CH(off) == _T('\''))
attr_state = 42;
else if(!ISANYOF(off, _T("\"'=<>`")) && !ISNEWLINE(off))
attr_state = 41;
else
return FALSE;
off++;
} else {
/* Anything unexpected. */
return FALSE;
}
}
/* We have to be on a single line. See definition of start condition
* of HTML block, type 7. */
if(n_lines == 0)
return FALSE;
i++;
if(i >= n_lines)
return FALSE;
off = lines[i].beg;
line_end = lines[i].end;
if(attr_state == 0 || attr_state == 41)
attr_state = 1;
if(off >= max_end)
return FALSE;
}
done:
if(off >= max_end)
return FALSE;
*p_end = off+1;
return TRUE;
}
static int
md_scan_for_html_closer(MD_CTX* ctx, const MD_CHAR* str, MD_SIZE len,
const MD_LINE* lines, int n_lines,
OFF beg, OFF max_end, OFF* p_end,
OFF* p_scan_horizon)
{
OFF off = beg;
int i = 0;
if(off < *p_scan_horizon && *p_scan_horizon >= max_end - len) {
/* We have already scanned the range up to the max_end so we know
* there is nothing to see. */
return FALSE;
}
while(TRUE) {
while(off + len <= lines[i].end && off + len <= max_end) {
if(md_ascii_eq(STR(off), str, len)) {
/* Success. */
*p_end = off + len;
return TRUE;
}
off++;
}
i++;
if(off >= max_end || i >= n_lines) {
/* Failure. */
*p_scan_horizon = off;
return FALSE;
}
off = lines[i].beg;
}
}
static int
md_is_html_comment(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, OFF max_end, OFF* p_end)
{
OFF off = beg;
MD_ASSERT(CH(beg) == _T('<'));
if(off + 4 >= lines[0].end)
return FALSE;
if(CH(off+1) != _T('!') || CH(off+2) != _T('-') || CH(off+3) != _T('-'))
return FALSE;
off += 4;
/* ">" and "->" must not follow the opening. */
if(off < lines[0].end && CH(off) == _T('>'))
return FALSE;
if(off+1 < lines[0].end && CH(off) == _T('-') && CH(off+1) == _T('>'))
return FALSE;
/* HTML comment must not contain "--", so we scan just for "--" instead
* of "-->" and verify manually that '>' follows. */
if(md_scan_for_html_closer(ctx, _T("--"), 2,
lines, n_lines, off, max_end, p_end, &ctx->html_comment_horizon))
{
if(*p_end < max_end && CH(*p_end) == _T('>')) {
*p_end = *p_end + 1;
return TRUE;
}
}
return FALSE;
}
static int
md_is_html_processing_instruction(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, OFF max_end, OFF* p_end)
{
OFF off = beg;
if(off + 2 >= lines[0].end)
return FALSE;
if(CH(off+1) != _T('?'))
return FALSE;
off += 2;
return md_scan_for_html_closer(ctx, _T("?>"), 2,
lines, n_lines, off, max_end, p_end, &ctx->html_proc_instr_horizon);
}
static int
md_is_html_declaration(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, OFF max_end, OFF* p_end)
{
OFF off = beg;
if(off + 2 >= lines[0].end)
return FALSE;
if(CH(off+1) != _T('!'))
return FALSE;
off += 2;
/* Declaration name. */
if(off >= lines[0].end || !ISALPHA(off))
return FALSE;
off++;
while(off < lines[0].end && ISALPHA(off))
off++;
if(off < lines[0].end && !ISWHITESPACE(off))
return FALSE;
return md_scan_for_html_closer(ctx, _T(">"), 1,
lines, n_lines, off, max_end, p_end, &ctx->html_decl_horizon);
}
static int
md_is_html_cdata(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, OFF max_end, OFF* p_end)
{
static const CHAR open_str[] = _T("<![CDATA[");
static const SZ open_size = SIZEOF_ARRAY(open_str) - 1;
OFF off = beg;
if(off + open_size >= lines[0].end)
return FALSE;
if(memcmp(STR(off), open_str, open_size) != 0)
return FALSE;
off += open_size;
if(lines[n_lines-1].end < max_end)
max_end = lines[n_lines-1].end - 2;
return md_scan_for_html_closer(ctx, _T("]]>"), 3,
lines, n_lines, off, max_end, p_end, &ctx->html_cdata_horizon);
}
static int
md_is_html_any(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, OFF max_end, OFF* p_end)
{
MD_ASSERT(CH(beg) == _T('<'));
return (md_is_html_tag(ctx, lines, n_lines, beg, max_end, p_end) ||
md_is_html_comment(ctx, lines, n_lines, beg, max_end, p_end) ||
md_is_html_processing_instruction(ctx, lines, n_lines, beg, max_end, p_end) ||
md_is_html_declaration(ctx, lines, n_lines, beg, max_end, p_end) ||
md_is_html_cdata(ctx, lines, n_lines, beg, max_end, p_end));
}
/****************************
*** Recognizing Entity ***
****************************/
static int
md_is_hex_entity_contents(MD_CTX* ctx, const CHAR* text, OFF beg, OFF max_end, OFF* p_end)
{
OFF off = beg;
while(off < max_end && ISXDIGIT_(text[off]) && off - beg <= 8)
off++;
if(1 <= off - beg && off - beg <= 6) {
*p_end = off;
return TRUE;
} else {
return FALSE;
}
}
static int
md_is_dec_entity_contents(MD_CTX* ctx, const CHAR* text, OFF beg, OFF max_end, OFF* p_end)
{
OFF off = beg;
while(off < max_end && ISDIGIT_(text[off]) && off - beg <= 8)
off++;
if(1 <= off - beg && off - beg <= 7) {
*p_end = off;
return TRUE;
} else {
return FALSE;
}
}
static int
md_is_named_entity_contents(MD_CTX* ctx, const CHAR* text, OFF beg, OFF max_end, OFF* p_end)
{
OFF off = beg;
if(off < max_end && ISALPHA_(text[off]))
off++;
else
return FALSE;
while(off < max_end && ISALNUM_(text[off]) && off - beg <= 48)
off++;
if(2 <= off - beg && off - beg <= 48) {
*p_end = off;
return TRUE;
} else {
return FALSE;
}
}
static int
md_is_entity_str(MD_CTX* ctx, const CHAR* text, OFF beg, OFF max_end, OFF* p_end)
{
int is_contents;
OFF off = beg;
MD_ASSERT(text[off] == _T('&'));
off++;
if(off+2 < max_end && text[off] == _T('#') && (text[off+1] == _T('x') || text[off+1] == _T('X')))
is_contents = md_is_hex_entity_contents(ctx, text, off+2, max_end, &off);
else if(off+1 < max_end && text[off] == _T('#'))
is_contents = md_is_dec_entity_contents(ctx, text, off+1, max_end, &off);
else
is_contents = md_is_named_entity_contents(ctx, text, off, max_end, &off);
if(is_contents && off < max_end && text[off] == _T(';')) {
*p_end = off+1;
return TRUE;
} else {
return FALSE;
}
}
static inline int
md_is_entity(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end)
{
return md_is_entity_str(ctx, ctx->text, beg, max_end, p_end);
}
/******************************
*** Attribute Management ***
******************************/
typedef struct MD_ATTRIBUTE_BUILD_tag MD_ATTRIBUTE_BUILD;
struct MD_ATTRIBUTE_BUILD_tag {
CHAR* text;
MD_TEXTTYPE* substr_types;
OFF* substr_offsets;
int substr_count;
int substr_alloc;
MD_TEXTTYPE trivial_types[1];
OFF trivial_offsets[2];
};
#define MD_BUILD_ATTR_NO_ESCAPES 0x0001
static int
md_build_attr_append_substr(MD_CTX* ctx, MD_ATTRIBUTE_BUILD* build,
MD_TEXTTYPE type, OFF off)
{
if(build->substr_count >= build->substr_alloc) {
MD_TEXTTYPE* new_substr_types;
OFF* new_substr_offsets;
build->substr_alloc = (build->substr_alloc > 0
? build->substr_alloc + build->substr_alloc / 2
: 8);
new_substr_types = (MD_TEXTTYPE*) realloc(build->substr_types,
build->substr_alloc * sizeof(MD_TEXTTYPE));
if(new_substr_types == NULL) {
MD_LOG("realloc() failed.");
return -1;
}
/* Note +1 to reserve space for final offset (== raw_size). */
new_substr_offsets = (OFF*) realloc(build->substr_offsets,
(build->substr_alloc+1) * sizeof(OFF));
if(new_substr_offsets == NULL) {
MD_LOG("realloc() failed.");
free(new_substr_types);
return -1;
}
build->substr_types = new_substr_types;
build->substr_offsets = new_substr_offsets;
}
build->substr_types[build->substr_count] = type;
build->substr_offsets[build->substr_count] = off;
build->substr_count++;
return 0;
}
static void
md_free_attribute(MD_CTX* ctx, MD_ATTRIBUTE_BUILD* build)
{
if(build->substr_alloc > 0) {
free(build->text);
free(build->substr_types);
free(build->substr_offsets);
}
}
static int
md_build_attribute(MD_CTX* ctx, const CHAR* raw_text, SZ raw_size,
unsigned flags, MD_ATTRIBUTE* attr, MD_ATTRIBUTE_BUILD* build)
{
OFF raw_off, off;
int is_trivial;
int ret = 0;
memset(build, 0, sizeof(MD_ATTRIBUTE_BUILD));
/* If there is no backslash and no ampersand, build trivial attribute
* without any malloc(). */
is_trivial = TRUE;
for(raw_off = 0; raw_off < raw_size; raw_off++) {
if(ISANYOF3_(raw_text[raw_off], _T('\\'), _T('&'), _T('\0'))) {
is_trivial = FALSE;
break;
}
}
if(is_trivial) {
build->text = (CHAR*) (raw_size ? raw_text : NULL);
build->substr_types = build->trivial_types;
build->substr_offsets = build->trivial_offsets;
build->substr_count = 1;
build->substr_alloc = 0;
build->trivial_types[0] = MD_TEXT_NORMAL;
build->trivial_offsets[0] = 0;
build->trivial_offsets[1] = raw_size;
off = raw_size;
} else {
build->text = (CHAR*) malloc(raw_size * sizeof(CHAR));
if(build->text == NULL) {
MD_LOG("malloc() failed.");
goto abort;
}
raw_off = 0;
off = 0;
while(raw_off < raw_size) {
if(raw_text[raw_off] == _T('\0')) {
MD_CHECK(md_build_attr_append_substr(ctx, build, MD_TEXT_NULLCHAR, off));
memcpy(build->text + off, raw_text + raw_off, 1);
off++;
raw_off++;
continue;
}
if(raw_text[raw_off] == _T('&')) {
OFF ent_end;
if(md_is_entity_str(ctx, raw_text, raw_off, raw_size, &ent_end)) {
MD_CHECK(md_build_attr_append_substr(ctx, build, MD_TEXT_ENTITY, off));
memcpy(build->text + off, raw_text + raw_off, ent_end - raw_off);
off += ent_end - raw_off;
raw_off = ent_end;
continue;
}
}
if(build->substr_count == 0 || build->substr_types[build->substr_count-1] != MD_TEXT_NORMAL)
MD_CHECK(md_build_attr_append_substr(ctx, build, MD_TEXT_NORMAL, off));
if(!(flags & MD_BUILD_ATTR_NO_ESCAPES) &&
raw_text[raw_off] == _T('\\') && raw_off+1 < raw_size &&
(ISPUNCT_(raw_text[raw_off+1]) || ISNEWLINE_(raw_text[raw_off+1])))
raw_off++;
build->text[off++] = raw_text[raw_off++];
}
build->substr_offsets[build->substr_count] = off;
}
attr->text = build->text;
attr->size = off;
attr->substr_offsets = build->substr_offsets;
attr->substr_types = build->substr_types;
return 0;
abort:
md_free_attribute(ctx, build);
return -1;
}
/*********************************************
*** Dictionary of Reference Definitions ***
*********************************************/
#define MD_FNV1A_BASE 2166136261U
#define MD_FNV1A_PRIME 16777619U
static inline unsigned
md_fnv1a(unsigned base, const void* data, size_t n)
{
const unsigned char* buf = (const unsigned char*) data;
unsigned hash = base;
size_t i;
for(i = 0; i < n; i++) {
hash ^= buf[i];
hash *= MD_FNV1A_PRIME;
}
return hash;
}
struct MD_REF_DEF_tag {
CHAR* label;
CHAR* title;
unsigned hash;
SZ label_size;
SZ title_size;
OFF dest_beg;
OFF dest_end;
unsigned char label_needs_free : 1;
unsigned char title_needs_free : 1;
};
/* Label equivalence is quite complicated with regards to whitespace and case
* folding. This complicates computing a hash of it as well as direct comparison
* of two labels. */
static unsigned
md_link_label_hash(const CHAR* label, SZ size)
{
unsigned hash = MD_FNV1A_BASE;
OFF off;
unsigned codepoint;
int is_whitespace = FALSE;
off = md_skip_unicode_whitespace(label, 0, size);
while(off < size) {
SZ char_size;
codepoint = md_decode_unicode(label, off, size, &char_size);
is_whitespace = ISUNICODEWHITESPACE_(codepoint) || ISNEWLINE_(label[off]);
if(is_whitespace) {
codepoint = ' ';
hash = md_fnv1a(hash, &codepoint, sizeof(unsigned));
off = md_skip_unicode_whitespace(label, off, size);
} else {
MD_UNICODE_FOLD_INFO fold_info;
md_get_unicode_fold_info(codepoint, &fold_info);
hash = md_fnv1a(hash, fold_info.codepoints, fold_info.n_codepoints * sizeof(unsigned));
off += char_size;
}
}
return hash;
}
static OFF
md_link_label_cmp_load_fold_info(const CHAR* label, OFF off, SZ size,
MD_UNICODE_FOLD_INFO* fold_info)
{
unsigned codepoint;
SZ char_size;
if(off >= size) {
/* Treat end of a link label as a whitespace. */
goto whitespace;
}
if(ISNEWLINE_(label[off])) {
/* Treat new lines as a whitespace. */
off++;
goto whitespace;
}
codepoint = md_decode_unicode(label, off, size, &char_size);
off += char_size;
if(ISUNICODEWHITESPACE_(codepoint)) {
/* Treat all whitespace as equivalent */
goto whitespace;
}
/* Get real folding info. */
md_get_unicode_fold_info(codepoint, fold_info);
return off;
whitespace:
fold_info->codepoints[0] = _T(' ');
fold_info->n_codepoints = 1;
return md_skip_unicode_whitespace(label, off, size);
}
static int
md_link_label_cmp(const CHAR* a_label, SZ a_size, const CHAR* b_label, SZ b_size)
{
OFF a_off;
OFF b_off;
int a_reached_end = FALSE;
int b_reached_end = FALSE;
MD_UNICODE_FOLD_INFO a_fi = { { 0 }, 0 };
MD_UNICODE_FOLD_INFO b_fi = { { 0 }, 0 };
OFF a_fi_off = 0;
OFF b_fi_off = 0;
int cmp;
a_off = md_skip_unicode_whitespace(a_label, 0, a_size);
b_off = md_skip_unicode_whitespace(b_label, 0, b_size);
while(!a_reached_end || !b_reached_end) {
/* If needed, load fold info for next char. */
if(a_fi_off >= a_fi.n_codepoints) {
a_fi_off = 0;
a_off = md_link_label_cmp_load_fold_info(a_label, a_off, a_size, &a_fi);
a_reached_end = (a_off >= a_size);
}
if(b_fi_off >= b_fi.n_codepoints) {
b_fi_off = 0;
b_off = md_link_label_cmp_load_fold_info(b_label, b_off, b_size, &b_fi);
b_reached_end = (b_off >= b_size);
}
cmp = b_fi.codepoints[b_fi_off] - a_fi.codepoints[a_fi_off];
if(cmp != 0)
return cmp;
a_fi_off++;
b_fi_off++;
}
return 0;
}
typedef struct MD_REF_DEF_LIST_tag MD_REF_DEF_LIST;
struct MD_REF_DEF_LIST_tag {
int n_ref_defs;
int alloc_ref_defs;
MD_REF_DEF* ref_defs[]; /* Valid items always point into ctx->ref_defs[] */
};
static int
md_ref_def_cmp(const void* a, const void* b)
{
const MD_REF_DEF* a_ref = *(const MD_REF_DEF**)a;
const MD_REF_DEF* b_ref = *(const MD_REF_DEF**)b;
if(a_ref->hash < b_ref->hash)
return -1;
else if(a_ref->hash > b_ref->hash)
return +1;
else
return md_link_label_cmp(a_ref->label, a_ref->label_size, b_ref->label, b_ref->label_size);
}
static int
md_ref_def_cmp_for_sort(const void* a, const void* b)
{
int cmp;
cmp = md_ref_def_cmp(a, b);
/* Ensure stability of the sorting. */
if(cmp == 0) {
const MD_REF_DEF* a_ref = *(const MD_REF_DEF**)a;
const MD_REF_DEF* b_ref = *(const MD_REF_DEF**)b;
if(a_ref < b_ref)
cmp = -1;
else if(a_ref > b_ref)
cmp = +1;
else
cmp = 0;
}
return cmp;
}
static int
md_build_ref_def_hashtable(MD_CTX* ctx)
{
int i, j;
if(ctx->n_ref_defs == 0)
return 0;
ctx->ref_def_hashtable_size = (ctx->n_ref_defs * 5) / 4;
ctx->ref_def_hashtable = malloc(ctx->ref_def_hashtable_size * sizeof(void*));
if(ctx->ref_def_hashtable == NULL) {
MD_LOG("malloc() failed.");
goto abort;
}
memset(ctx->ref_def_hashtable, 0, ctx->ref_def_hashtable_size * sizeof(void*));
/* Each member of ctx->ref_def_hashtable[] can be:
* -- NULL,
* -- pointer to the MD_REF_DEF in ctx->ref_defs[], or
* -- pointer to a MD_REF_DEF_LIST, which holds multiple pointers to
* such MD_REF_DEFs.
*/
for(i = 0; i < ctx->n_ref_defs; i++) {
MD_REF_DEF* def = &ctx->ref_defs[i];
void* bucket;
MD_REF_DEF_LIST* list;
def->hash = md_link_label_hash(def->label, def->label_size);
bucket = ctx->ref_def_hashtable[def->hash % ctx->ref_def_hashtable_size];
if(bucket == NULL) {
/* The bucket is empty. Make it just point to the def. */
ctx->ref_def_hashtable[def->hash % ctx->ref_def_hashtable_size] = def;
continue;
}
if(ctx->ref_defs <= (MD_REF_DEF*) bucket && (MD_REF_DEF*) bucket < ctx->ref_defs + ctx->n_ref_defs) {
/* The bucket already contains one ref. def. Lets see whether it
* is the same label (ref. def. duplicate) or different one
* (hash conflict). */
MD_REF_DEF* old_def = (MD_REF_DEF*) bucket;
if(md_link_label_cmp(def->label, def->label_size, old_def->label, old_def->label_size) == 0) {
/* Duplicate label: Ignore this ref. def. */
continue;
}
/* Make the bucket complex, i.e. able to hold more ref. defs. */
list = (MD_REF_DEF_LIST*) malloc(sizeof(MD_REF_DEF_LIST) + 2 * sizeof(MD_REF_DEF*));
if(list == NULL) {
MD_LOG("malloc() failed.");
goto abort;
}
list->ref_defs[0] = old_def;
list->ref_defs[1] = def;
list->n_ref_defs = 2;
list->alloc_ref_defs = 2;
ctx->ref_def_hashtable[def->hash % ctx->ref_def_hashtable_size] = list;
continue;
}
/* Append the def to the complex bucket list.
*
* Note in this case we ignore potential duplicates to avoid expensive
* iterating over the complex bucket. Below, we revisit all the complex
* buckets and handle it more cheaply after the complex bucket contents
* is sorted. */
list = (MD_REF_DEF_LIST*) bucket;
if(list->n_ref_defs >= list->alloc_ref_defs) {
int alloc_ref_defs = list->alloc_ref_defs + list->alloc_ref_defs / 2;
MD_REF_DEF_LIST* list_tmp = (MD_REF_DEF_LIST*) realloc(list,
sizeof(MD_REF_DEF_LIST) + alloc_ref_defs * sizeof(MD_REF_DEF*));
if(list_tmp == NULL) {
MD_LOG("realloc() failed.");
goto abort;
}
list = list_tmp;
list->alloc_ref_defs = alloc_ref_defs;
ctx->ref_def_hashtable[def->hash % ctx->ref_def_hashtable_size] = list;
}
list->ref_defs[list->n_ref_defs] = def;
list->n_ref_defs++;
}
/* Sort the complex buckets so we can use bsearch() with them. */
for(i = 0; i < ctx->ref_def_hashtable_size; i++) {
void* bucket = ctx->ref_def_hashtable[i];
MD_REF_DEF_LIST* list;
if(bucket == NULL)
continue;
if(ctx->ref_defs <= (MD_REF_DEF*) bucket && (MD_REF_DEF*) bucket < ctx->ref_defs + ctx->n_ref_defs)
continue;
list = (MD_REF_DEF_LIST*) bucket;
qsort(list->ref_defs, list->n_ref_defs, sizeof(MD_REF_DEF*), md_ref_def_cmp_for_sort);
/* Disable all duplicates in the complex bucket by forcing all such
* records to point to the 1st such ref. def. I.e. no matter which
* record is found during the lookup, it will always point to the right
* ref. def. in ctx->ref_defs[]. */
for(j = 1; j < list->n_ref_defs; j++) {
if(md_ref_def_cmp(&list->ref_defs[j-1], &list->ref_defs[j]) == 0)
list->ref_defs[j] = list->ref_defs[j-1];
}
}
return 0;
abort:
return -1;
}
static void
md_free_ref_def_hashtable(MD_CTX* ctx)
{
if(ctx->ref_def_hashtable != NULL) {
int i;
for(i = 0; i < ctx->ref_def_hashtable_size; i++) {
void* bucket = ctx->ref_def_hashtable[i];
if(bucket == NULL)
continue;
if(ctx->ref_defs <= (MD_REF_DEF*) bucket && (MD_REF_DEF*) bucket < ctx->ref_defs + ctx->n_ref_defs)
continue;
free(bucket);
}
free(ctx->ref_def_hashtable);
}
}
static const MD_REF_DEF*
md_lookup_ref_def(MD_CTX* ctx, const CHAR* label, SZ label_size)
{
unsigned hash;
void* bucket;
if(ctx->ref_def_hashtable_size == 0)
return NULL;
hash = md_link_label_hash(label, label_size);
bucket = ctx->ref_def_hashtable[hash % ctx->ref_def_hashtable_size];
if(bucket == NULL) {
return NULL;
} else if(ctx->ref_defs <= (MD_REF_DEF*) bucket && (MD_REF_DEF*) bucket < ctx->ref_defs + ctx->n_ref_defs) {
const MD_REF_DEF* def = (MD_REF_DEF*) bucket;
if(md_link_label_cmp(def->label, def->label_size, label, label_size) == 0)
return def;
else
return NULL;
} else {
MD_REF_DEF_LIST* list = (MD_REF_DEF_LIST*) bucket;
MD_REF_DEF key_buf;
const MD_REF_DEF* key = &key_buf;
const MD_REF_DEF** ret;
key_buf.label = (CHAR*) label;
key_buf.label_size = label_size;
key_buf.hash = md_link_label_hash(key_buf.label, key_buf.label_size);
ret = (const MD_REF_DEF**) bsearch(&key, list->ref_defs,
list->n_ref_defs, sizeof(MD_REF_DEF*), md_ref_def_cmp);
if(ret != NULL)
return *ret;
else
return NULL;
}
}
/***************************
*** Recognizing Links ***
***************************/
/* Note this code is partially shared between processing inlines and blocks
* as reference definitions and links share some helper parser functions.
*/
typedef struct MD_LINK_ATTR_tag MD_LINK_ATTR;
struct MD_LINK_ATTR_tag {
OFF dest_beg;
OFF dest_end;
CHAR* title;
SZ title_size;
int title_needs_free;
};
static int
md_is_link_label(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg,
OFF* p_end, int* p_beg_line_index, int* p_end_line_index,
OFF* p_contents_beg, OFF* p_contents_end)
{
OFF off = beg;
OFF contents_beg = 0;
OFF contents_end = 0;
int line_index = 0;
int len = 0;
if(CH(off) != _T('['))
return FALSE;
off++;
while(1) {
OFF line_end = lines[line_index].end;
while(off < line_end) {
if(CH(off) == _T('\\') && off+1 < ctx->size && (ISPUNCT(off+1) || ISNEWLINE(off+1))) {
if(contents_end == 0) {
contents_beg = off;
*p_beg_line_index = line_index;
}
contents_end = off + 2;
off += 2;
} else if(CH(off) == _T('[')) {
return FALSE;
} else if(CH(off) == _T(']')) {
if(contents_beg < contents_end) {
/* Success. */
*p_contents_beg = contents_beg;
*p_contents_end = contents_end;
*p_end = off+1;
*p_end_line_index = line_index;
return TRUE;
} else {
/* Link label must have some non-whitespace contents. */
return FALSE;
}
} else {
unsigned codepoint;
SZ char_size;
codepoint = md_decode_unicode(ctx->text, off, ctx->size, &char_size);
if(!ISUNICODEWHITESPACE_(codepoint)) {
if(contents_end == 0) {
contents_beg = off;
*p_beg_line_index = line_index;
}
contents_end = off + char_size;
}
off += char_size;
}
len++;
if(len > 999)
return FALSE;
}
line_index++;
len++;
if(line_index < n_lines)
off = lines[line_index].beg;
else
break;
}
return FALSE;
}
static int
md_is_link_destination_A(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end,
OFF* p_contents_beg, OFF* p_contents_end)
{
OFF off = beg;
if(off >= max_end || CH(off) != _T('<'))
return FALSE;
off++;
while(off < max_end) {
if(CH(off) == _T('\\') && off+1 < max_end && ISPUNCT(off+1)) {
off += 2;
continue;
}
if(ISNEWLINE(off) || CH(off) == _T('<'))
return FALSE;
if(CH(off) == _T('>')) {
/* Success. */
*p_contents_beg = beg+1;
*p_contents_end = off;
*p_end = off+1;
return TRUE;
}
off++;
}
return FALSE;
}
static int
md_is_link_destination_B(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end,
OFF* p_contents_beg, OFF* p_contents_end)
{
OFF off = beg;
int parenthesis_level = 0;
while(off < max_end) {
if(CH(off) == _T('\\') && off+1 < max_end && ISPUNCT(off+1)) {
off += 2;
continue;
}
if(ISWHITESPACE(off) || ISCNTRL(off))
break;
/* Link destination may include balanced pairs of unescaped '(' ')'.
* Note we limit the maximal nesting level by 32 to protect us from
* https://github.com/jgm/cmark/issues/214 */
if(CH(off) == _T('(')) {
parenthesis_level++;
if(parenthesis_level > 32)
return FALSE;
} else if(CH(off) == _T(')')) {
if(parenthesis_level == 0)
break;
parenthesis_level--;
}
off++;
}
if(parenthesis_level != 0 || off == beg)
return FALSE;
/* Success. */
*p_contents_beg = beg;
*p_contents_end = off;
*p_end = off;
return TRUE;
}
static inline int
md_is_link_destination(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end,
OFF* p_contents_beg, OFF* p_contents_end)
{
if(CH(beg) == _T('<'))
return md_is_link_destination_A(ctx, beg, max_end, p_end, p_contents_beg, p_contents_end);
else
return md_is_link_destination_B(ctx, beg, max_end, p_end, p_contents_beg, p_contents_end);
}
static int
md_is_link_title(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg,
OFF* p_end, int* p_beg_line_index, int* p_end_line_index,
OFF* p_contents_beg, OFF* p_contents_end)
{
OFF off = beg;
CHAR closer_char;
int line_index = 0;
/* White space with up to one line break. */
while(off < lines[line_index].end && ISWHITESPACE(off))
off++;
if(off >= lines[line_index].end) {
line_index++;
if(line_index >= n_lines)
return FALSE;
off = lines[line_index].beg;
}
if(off == beg)
return FALSE;
*p_beg_line_index = line_index;
/* First char determines how to detect end of it. */
switch(CH(off)) {
case _T('"'): closer_char = _T('"'); break;
case _T('\''): closer_char = _T('\''); break;
case _T('('): closer_char = _T(')'); break;
default: return FALSE;
}
off++;
*p_contents_beg = off;
while(line_index < n_lines) {
OFF line_end = lines[line_index].end;
while(off < line_end) {
if(CH(off) == _T('\\') && off+1 < ctx->size && (ISPUNCT(off+1) || ISNEWLINE(off+1))) {
off++;
} else if(CH(off) == closer_char) {
/* Success. */
*p_contents_end = off;
*p_end = off+1;
*p_end_line_index = line_index;
return TRUE;
} else if(closer_char == _T(')') && CH(off) == _T('(')) {
/* ()-style title cannot contain (unescaped '(')) */
return FALSE;
}
off++;
}
line_index++;
}
return FALSE;
}
/* Returns 0 if it is not a reference definition.
*
* Returns N > 0 if it is a reference definition. N then corresponds to the
* number of lines forming it). In this case the definition is stored for
* resolving any links referring to it.
*
* Returns -1 in case of an error (out of memory).
*/
static int
md_is_link_reference_definition(MD_CTX* ctx, const MD_LINE* lines, int n_lines)
{
OFF label_contents_beg;
OFF label_contents_end;
int label_contents_line_index = -1;
int label_is_multiline = FALSE;
OFF dest_contents_beg;
OFF dest_contents_end;
OFF title_contents_beg;
OFF title_contents_end;
int title_contents_line_index;
int title_is_multiline = FALSE;
OFF off;
int line_index = 0;
int tmp_line_index;
MD_REF_DEF* def = NULL;
int ret = 0;
/* Link label. */
if(!md_is_link_label(ctx, lines, n_lines, lines[0].beg,
&off, &label_contents_line_index, &line_index,
&label_contents_beg, &label_contents_end))
return FALSE;
label_is_multiline = (label_contents_line_index != line_index);
/* Colon. */
if(off >= lines[line_index].end || CH(off) != _T(':'))
return FALSE;
off++;
/* Optional white space with up to one line break. */
while(off < lines[line_index].end && ISWHITESPACE(off))
off++;
if(off >= lines[line_index].end) {
line_index++;
if(line_index >= n_lines)
return FALSE;
off = lines[line_index].beg;
}
/* Link destination. */
if(!md_is_link_destination(ctx, off, lines[line_index].end,
&off, &dest_contents_beg, &dest_contents_end))
return FALSE;
/* (Optional) title. Note we interpret it as an title only if nothing
* more follows on its last line. */
if(md_is_link_title(ctx, lines + line_index, n_lines - line_index, off,
&off, &title_contents_line_index, &tmp_line_index,
&title_contents_beg, &title_contents_end)
&& off >= lines[line_index + tmp_line_index].end)
{
title_is_multiline = (tmp_line_index != title_contents_line_index);
title_contents_line_index += line_index;
line_index += tmp_line_index;
} else {
/* Not a title. */
title_is_multiline = FALSE;
title_contents_beg = off;
title_contents_end = off;
title_contents_line_index = 0;
}
/* Nothing more can follow on the last line. */
if(off < lines[line_index].end)
return FALSE;
/* So, it _is_ a reference definition. Remember it. */
if(ctx->n_ref_defs >= ctx->alloc_ref_defs) {
MD_REF_DEF* new_defs;
ctx->alloc_ref_defs = (ctx->alloc_ref_defs > 0
? ctx->alloc_ref_defs + ctx->alloc_ref_defs / 2
: 16);
new_defs = (MD_REF_DEF*) realloc(ctx->ref_defs, ctx->alloc_ref_defs * sizeof(MD_REF_DEF));
if(new_defs == NULL) {
MD_LOG("realloc() failed.");
goto abort;
}
ctx->ref_defs = new_defs;
}
def = &ctx->ref_defs[ctx->n_ref_defs];
memset(def, 0, sizeof(MD_REF_DEF));
if(label_is_multiline) {
MD_CHECK(md_merge_lines_alloc(ctx, label_contents_beg, label_contents_end,
lines + label_contents_line_index, n_lines - label_contents_line_index,
_T(' '), &def->label, &def->label_size));
def->label_needs_free = TRUE;
} else {
def->label = (CHAR*) STR(label_contents_beg);
def->label_size = label_contents_end - label_contents_beg;
}
if(title_is_multiline) {
MD_CHECK(md_merge_lines_alloc(ctx, title_contents_beg, title_contents_end,
lines + title_contents_line_index, n_lines - title_contents_line_index,
_T('\n'), &def->title, &def->title_size));
def->title_needs_free = TRUE;
} else {
def->title = (CHAR*) STR(title_contents_beg);
def->title_size = title_contents_end - title_contents_beg;
}
def->dest_beg = dest_contents_beg;
def->dest_end = dest_contents_end;
/* Success. */
ctx->n_ref_defs++;
return line_index + 1;
abort:
/* Failure. */
if(def != NULL && def->label_needs_free)
free(def->label);
if(def != NULL && def->title_needs_free)
free(def->title);
return ret;
}
static int
md_is_link_reference(MD_CTX* ctx, const MD_LINE* lines, int n_lines,
OFF beg, OFF end, MD_LINK_ATTR* attr)
{
const MD_REF_DEF* def;
const MD_LINE* beg_line;
const MD_LINE* end_line;
CHAR* label;
SZ label_size;
int ret;
MD_ASSERT(CH(beg) == _T('[') || CH(beg) == _T('!'));
MD_ASSERT(CH(end-1) == _T(']'));
beg += (CH(beg) == _T('!') ? 2 : 1);
end--;
/* Find lines corresponding to the beg and end positions. */
MD_ASSERT(lines[0].beg <= beg);
beg_line = lines;
while(beg >= beg_line->end)
beg_line++;
MD_ASSERT(end <= lines[n_lines-1].end);
end_line = beg_line;
while(end >= end_line->end)
end_line++;
if(beg_line != end_line) {
MD_CHECK(md_merge_lines_alloc(ctx, beg, end, beg_line,
n_lines - (beg_line - lines), _T(' '), &label, &label_size));
} else {
label = (CHAR*) STR(beg);
label_size = end - beg;
}
def = md_lookup_ref_def(ctx, label, label_size);
if(def != NULL) {
attr->dest_beg = def->dest_beg;
attr->dest_end = def->dest_end;
attr->title = def->title;
attr->title_size = def->title_size;
attr->title_needs_free = FALSE;
}
if(beg_line != end_line)
free(label);
ret = (def != NULL);
abort:
return ret;
}
static int
md_is_inline_link_spec(MD_CTX* ctx, const MD_LINE* lines, int n_lines,
OFF beg, OFF* p_end, MD_LINK_ATTR* attr)
{
int line_index = 0;
int tmp_line_index;
OFF title_contents_beg;
OFF title_contents_end;
int title_contents_line_index;
int title_is_multiline;
OFF off = beg;
int ret = FALSE;
while(off >= lines[line_index].end)
line_index++;
MD_ASSERT(CH(off) == _T('('));
off++;
/* Optional white space with up to one line break. */
while(off < lines[line_index].end && ISWHITESPACE(off))
off++;
if(off >= lines[line_index].end && ISNEWLINE(off)) {
line_index++;
if(line_index >= n_lines)
return FALSE;
off = lines[line_index].beg;
}
/* Link destination may be omitted, but only when not also having a title. */
if(off < ctx->size && CH(off) == _T(')')) {
attr->dest_beg = off;
attr->dest_end = off;
attr->title = NULL;
attr->title_size = 0;
attr->title_needs_free = FALSE;
off++;
*p_end = off;
return TRUE;
}
/* Link destination. */
if(!md_is_link_destination(ctx, off, lines[line_index].end,
&off, &attr->dest_beg, &attr->dest_end))
return FALSE;
/* (Optional) title. */
if(md_is_link_title(ctx, lines + line_index, n_lines - line_index, off,
&off, &title_contents_line_index, &tmp_line_index,
&title_contents_beg, &title_contents_end))
{
title_is_multiline = (tmp_line_index != title_contents_line_index);
title_contents_line_index += line_index;
line_index += tmp_line_index;
} else {
/* Not a title. */
title_is_multiline = FALSE;
title_contents_beg = off;
title_contents_end = off;
title_contents_line_index = 0;
}
/* Optional whitespace followed with final ')'. */
while(off < lines[line_index].end && ISWHITESPACE(off))
off++;
if(off >= lines[line_index].end && ISNEWLINE(off)) {
line_index++;
if(line_index >= n_lines)
return FALSE;
off = lines[line_index].beg;
}
if(CH(off) != _T(')'))
goto abort;
off++;
if(title_contents_beg >= title_contents_end) {
attr->title = NULL;
attr->title_size = 0;
attr->title_needs_free = FALSE;
} else if(!title_is_multiline) {
attr->title = (CHAR*) STR(title_contents_beg);
attr->title_size = title_contents_end - title_contents_beg;
attr->title_needs_free = FALSE;
} else {
MD_CHECK(md_merge_lines_alloc(ctx, title_contents_beg, title_contents_end,
lines + title_contents_line_index, n_lines - title_contents_line_index,
_T('\n'), &attr->title, &attr->title_size));
attr->title_needs_free = TRUE;
}
*p_end = off;
ret = TRUE;
abort:
return ret;
}
static void
md_free_ref_defs(MD_CTX* ctx)
{
int i;
for(i = 0; i < ctx->n_ref_defs; i++) {
MD_REF_DEF* def = &ctx->ref_defs[i];
if(def->label_needs_free)
free(def->label);
if(def->title_needs_free)
free(def->title);
}
free(ctx->ref_defs);
}
/******************************************
*** Processing Inlines (a.k.a Spans) ***
******************************************/
/* We process inlines in few phases:
*
* (1) We go through the block text and collect all significant characters
* which may start/end a span or some other significant position into
* ctx->marks[]. Core of this is what md_collect_marks() does.
*
* We also do some very brief preliminary context-less analysis, whether
* it might be opener or closer (e.g. of an emphasis span).
*
* This speeds the other steps as we do not need to re-iterate over all
* characters anymore.
*
* (2) We analyze each potential mark types, in order by their precedence.
*
* In each md_analyze_XXX() function, we re-iterate list of the marks,
* skipping already resolved regions (in preceding precedences) and try to
* resolve them.
*
* (2.1) For trivial marks, which are single (e.g. HTML entity), we just mark
* them as resolved.
*
* (2.2) For range-type marks, we analyze whether the mark could be closer
* and, if yes, whether there is some preceding opener it could satisfy.
*
* If not we check whether it could be really an opener and if yes, we
* remember it so subsequent closers may resolve it.
*
* (3) Finally, when all marks were analyzed, we render the block contents
* by calling MD_RENDERER::text() callback, interrupting by ::enter_span()
* or ::close_span() whenever we reach a resolved mark.
*/
/* The mark structure.
*
* '\\': Maybe escape sequence.
* '\0': NULL char.
* '*': Maybe (strong) emphasis start/end.
* '_': Maybe (strong) emphasis start/end.
* '~': Maybe strikethrough start/end (needs MD_FLAG_STRIKETHROUGH).
* '`': Maybe code span start/end.
* '&': Maybe start of entity.
* ';': Maybe end of entity.
* '<': Maybe start of raw HTML or autolink.
* '>': Maybe end of raw HTML or autolink.
* '[': Maybe start of link label or link text.
* '!': Equivalent of '[' for image.
* ']': Maybe end of link label or link text.
* '@': Maybe permissive e-mail auto-link (needs MD_FLAG_PERMISSIVEEMAILAUTOLINKS).
* ':': Maybe permissive URL auto-link (needs MD_FLAG_PERMISSIVEURLAUTOLINKS).
* '.': Maybe permissive WWW auto-link (needs MD_FLAG_PERMISSIVEWWWAUTOLINKS).
* 'D': Dummy mark, it reserves a space for splitting a previous mark
* (e.g. emphasis) or to make more space for storing some special data
* related to the preceding mark (e.g. link).
*
* Note that not all instances of these chars in the text imply creation of the
* structure. Only those which have (or may have, after we see more context)
* the special meaning.
*
* (Keep this struct as small as possible to fit as much of them into CPU
* cache line.)
*/
struct MD_MARK_tag {
OFF beg;
OFF end;
/* For unresolved openers, 'prev' and 'next' form the chain of open openers
* of given type 'ch'.
*
* During resolving, we disconnect from the chain and point to the
* corresponding counterpart so opener points to its closer and vice versa.
*/
int prev;
int next;
CHAR ch;
unsigned char flags;
};
/* Mark flags (these apply to ALL mark types). */
#define MD_MARK_POTENTIAL_OPENER 0x01 /* Maybe opener. */
#define MD_MARK_POTENTIAL_CLOSER 0x02 /* Maybe closer. */
#define MD_MARK_OPENER 0x04 /* Definitely opener. */
#define MD_MARK_CLOSER 0x08 /* Definitely closer. */
#define MD_MARK_RESOLVED 0x10 /* Resolved in any definite way. */
/* Mark flags specific for various mark types (so they can share bits). */
#define MD_MARK_EMPH_INTRAWORD 0x20 /* Helper for the "rule of 3". */
#define MD_MARK_EMPH_MOD3_0 0x40
#define MD_MARK_EMPH_MOD3_1 0x80
#define MD_MARK_EMPH_MOD3_2 (0x40 | 0x80)
#define MD_MARK_EMPH_MOD3_MASK (0x40 | 0x80)
#define MD_MARK_AUTOLINK 0x20 /* Distinguisher for '<', '>'. */
#define MD_MARK_VALIDPERMISSIVEAUTOLINK 0x20 /* For permissive autolinks. */
static MD_MARKCHAIN*
md_asterisk_chain(MD_CTX* ctx, unsigned flags)
{
switch(flags & (MD_MARK_EMPH_INTRAWORD | MD_MARK_EMPH_MOD3_MASK)) {
case MD_MARK_EMPH_INTRAWORD | MD_MARK_EMPH_MOD3_0: return &ASTERISK_OPENERS_intraword_mod3_0;
case MD_MARK_EMPH_INTRAWORD | MD_MARK_EMPH_MOD3_1: return &ASTERISK_OPENERS_intraword_mod3_1;
case MD_MARK_EMPH_INTRAWORD | MD_MARK_EMPH_MOD3_2: return &ASTERISK_OPENERS_intraword_mod3_2;
case MD_MARK_EMPH_MOD3_0: return &ASTERISK_OPENERS_extraword_mod3_0;
case MD_MARK_EMPH_MOD3_1: return &ASTERISK_OPENERS_extraword_mod3_1;
case MD_MARK_EMPH_MOD3_2: return &ASTERISK_OPENERS_extraword_mod3_2;
default: MD_UNREACHABLE();
}
return NULL;
}
static MD_MARKCHAIN*
md_mark_chain(MD_CTX* ctx, int mark_index)
{
MD_MARK* mark = &ctx->marks[mark_index];
switch(mark->ch) {
case _T('*'): return md_asterisk_chain(ctx, mark->flags);
case _T('_'): return &UNDERSCORE_OPENERS;
case _T('~'): return (mark->end - mark->beg == 1) ? &TILDE_OPENERS_1 : &TILDE_OPENERS_2;
case _T('['): return &BRACKET_OPENERS;
case _T('|'): return &TABLECELLBOUNDARIES;
default: return NULL;
}
}
static MD_MARK*
md_push_mark(MD_CTX* ctx)
{
if(ctx->n_marks >= ctx->alloc_marks) {
MD_MARK* new_marks;
ctx->alloc_marks = (ctx->alloc_marks > 0
? ctx->alloc_marks + ctx->alloc_marks / 2
: 64);
new_marks = realloc(ctx->marks, ctx->alloc_marks * sizeof(MD_MARK));
if(new_marks == NULL) {
MD_LOG("realloc() failed.");
return NULL;
}
ctx->marks = new_marks;
}
return &ctx->marks[ctx->n_marks++];
}
#define PUSH_MARK_() \
do { \
mark = md_push_mark(ctx); \
if(mark == NULL) { \
ret = -1; \
goto abort; \
} \
} while(0)
#define PUSH_MARK(ch_, beg_, end_, flags_) \
do { \
PUSH_MARK_(); \
mark->beg = (beg_); \
mark->end = (end_); \
mark->prev = -1; \
mark->next = -1; \
mark->ch = (char)(ch_); \
mark->flags = (flags_); \
} while(0)
static void
md_mark_chain_append(MD_CTX* ctx, MD_MARKCHAIN* chain, int mark_index)
{
if(chain->tail >= 0)
ctx->marks[chain->tail].next = mark_index;
else
chain->head = mark_index;
ctx->marks[mark_index].prev = chain->tail;
ctx->marks[mark_index].next = -1;
chain->tail = mark_index;
}
/* Sometimes, we need to store a pointer into the mark. It is quite rare
* so we do not bother to make MD_MARK use union, and it can only happen
* for dummy marks. */
static inline void
md_mark_store_ptr(MD_CTX* ctx, int mark_index, void* ptr)
{
MD_MARK* mark = &ctx->marks[mark_index];
MD_ASSERT(mark->ch == 'D');
/* Check only members beg and end are misused for this. */
MD_ASSERT(sizeof(void*) <= 2 * sizeof(OFF));
memcpy(mark, &ptr, sizeof(void*));
}
static inline void*
md_mark_get_ptr(MD_CTX* ctx, int mark_index)
{
void* ptr;
MD_MARK* mark = &ctx->marks[mark_index];
MD_ASSERT(mark->ch == 'D');
memcpy(&ptr, mark, sizeof(void*));
return ptr;
}
static void
md_resolve_range(MD_CTX* ctx, MD_MARKCHAIN* chain, int opener_index, int closer_index)
{
MD_MARK* opener = &ctx->marks[opener_index];
MD_MARK* closer = &ctx->marks[closer_index];
/* Remove opener from the list of openers. */
if(chain != NULL) {
if(opener->prev >= 0)
ctx->marks[opener->prev].next = opener->next;
else
chain->head = opener->next;
if(opener->next >= 0)
ctx->marks[opener->next].prev = opener->prev;
else
chain->tail = opener->prev;
}
/* Interconnect opener and closer and mark both as resolved. */
opener->next = closer_index;
opener->flags |= MD_MARK_OPENER | MD_MARK_RESOLVED;
closer->prev = opener_index;
closer->flags |= MD_MARK_CLOSER | MD_MARK_RESOLVED;
}
#define MD_ROLLBACK_ALL 0
#define MD_ROLLBACK_CROSSING 1
/* In the range ctx->marks[opener_index] ... [closer_index], undo some or all
* resolvings accordingly to these rules:
*
* (1) All openers BEFORE the range corresponding to any closer inside the
* range are un-resolved and they are re-added to their respective chains
* of unresolved openers. This ensures we can reuse the opener for closers
* AFTER the range.
*
* (2) If 'how' is MD_ROLLBACK_ALL, then ALL resolved marks inside the range
* are discarded.
*
* (3) If 'how' is MD_ROLLBACK_CROSSING, only closers with openers handled
* in (1) are discarded. I.e. pairs of openers and closers which are both
* inside the range are retained as well as any unpaired marks.
*/
static void
md_rollback(MD_CTX* ctx, int opener_index, int closer_index, int how)
{
int i;
int mark_index;
/* Cut all unresolved openers at the mark index. */
for(i = OPENERS_CHAIN_FIRST; i < OPENERS_CHAIN_LAST+1; i++) {
MD_MARKCHAIN* chain = &ctx->mark_chains[i];
while(chain->tail >= opener_index)
chain->tail = ctx->marks[chain->tail].prev;
if(chain->tail >= 0)
ctx->marks[chain->tail].next = -1;
else
chain->head = -1;
}
/* Go backwards so that unresolved openers are re-added into their
* respective chains, in the right order. */
mark_index = closer_index - 1;
while(mark_index > opener_index) {
MD_MARK* mark = &ctx->marks[mark_index];
int mark_flags = mark->flags;
int discard_flag = (how == MD_ROLLBACK_ALL);
if(mark->flags & MD_MARK_CLOSER) {
int mark_opener_index = mark->prev;
/* Undo opener BEFORE the range. */
if(mark_opener_index < opener_index) {
MD_MARK* mark_opener = &ctx->marks[mark_opener_index];
MD_MARKCHAIN* chain;
mark_opener->flags &= ~(MD_MARK_OPENER | MD_MARK_CLOSER | MD_MARK_RESOLVED);
chain = md_mark_chain(ctx, opener_index);
if(chain != NULL) {
md_mark_chain_append(ctx, chain, mark_opener_index);
discard_flag = 1;
}
}
}
/* And reset our flags. */
if(discard_flag)
mark->flags &= ~(MD_MARK_OPENER | MD_MARK_CLOSER | MD_MARK_RESOLVED);
/* Jump as far as we can over unresolved or non-interesting marks. */
switch(how) {
case MD_ROLLBACK_CROSSING:
if((mark_flags & MD_MARK_CLOSER) && mark->prev > opener_index) {
/* If we are closer with opener INSIDE the range, there may
* not be any other crosser inside the subrange. */
mark_index = mark->prev;
break;
}
/* Pass through. */
default:
mark_index--;
break;
}
}
}
static void
md_build_mark_char_map(MD_CTX* ctx)
{
memset(ctx->mark_char_map, 0, sizeof(ctx->mark_char_map));
ctx->mark_char_map['\\'] = 1;
ctx->mark_char_map['*'] = 1;
ctx->mark_char_map['_'] = 1;
ctx->mark_char_map['`'] = 1;
ctx->mark_char_map['&'] = 1;
ctx->mark_char_map[';'] = 1;
ctx->mark_char_map['<'] = 1;
ctx->mark_char_map['>'] = 1;
ctx->mark_char_map['['] = 1;
ctx->mark_char_map['!'] = 1;
ctx->mark_char_map[']'] = 1;
ctx->mark_char_map['\0'] = 1;
if(ctx->parser.flags & MD_FLAG_STRIKETHROUGH)
ctx->mark_char_map['~'] = 1;
if(ctx->parser.flags & MD_FLAG_LATEXMATHSPANS)
ctx->mark_char_map['$'] = 1;
if(ctx->parser.flags & MD_FLAG_PERMISSIVEEMAILAUTOLINKS)
ctx->mark_char_map['@'] = 1;
if(ctx->parser.flags & MD_FLAG_PERMISSIVEURLAUTOLINKS)
ctx->mark_char_map[':'] = 1;
if(ctx->parser.flags & MD_FLAG_PERMISSIVEWWWAUTOLINKS)
ctx->mark_char_map['.'] = 1;
if((ctx->parser.flags & MD_FLAG_TABLES) || (ctx->parser.flags & MD_FLAG_WIKILINKS))
ctx->mark_char_map['|'] = 1;
if(ctx->parser.flags & MD_FLAG_COLLAPSEWHITESPACE) {
int i;
for(i = 0; i < (int) sizeof(ctx->mark_char_map); i++) {
if(ISWHITESPACE_(i))
ctx->mark_char_map[i] = 1;
}
}
}
/* We limit code span marks to lower than 32 backticks. This solves the
* pathologic case of too many openers, each of different length: Their
* resolving would be then O(n^2). */
#define CODESPAN_MARK_MAXLEN 32
static int
md_is_code_span(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg,
OFF* p_opener_beg, OFF* p_opener_end,
OFF* p_closer_beg, OFF* p_closer_end,
OFF last_potential_closers[CODESPAN_MARK_MAXLEN],
int* p_reached_paragraph_end)
{
OFF opener_beg = beg;
OFF opener_end;
OFF closer_beg;
OFF closer_end;
SZ mark_len;
OFF line_end;
int has_space_after_opener = FALSE;
int has_eol_after_opener = FALSE;
int has_space_before_closer = FALSE;
int has_eol_before_closer = FALSE;
int has_only_space = TRUE;
int line_index = 0;
line_end = lines[0].end;
opener_end = opener_beg;
while(opener_end < line_end && CH(opener_end) == _T('`'))
opener_end++;
has_space_after_opener = (opener_end < line_end && CH(opener_end) == _T(' '));
has_eol_after_opener = (opener_end == line_end);
/* The caller needs to know end of the opening mark even if we fail. */
*p_opener_end = opener_end;
mark_len = opener_end - opener_beg;
if(mark_len > CODESPAN_MARK_MAXLEN)
return FALSE;
/* Check whether we already know there is no closer of this length.
* If so, re-scan does no sense. This fixes issue #59. */
if(last_potential_closers[mark_len-1] >= lines[n_lines-1].end ||
(*p_reached_paragraph_end && last_potential_closers[mark_len-1] < opener_end))
return FALSE;
closer_beg = opener_end;
closer_end = opener_end;
/* Find closer mark. */
while(TRUE) {
while(closer_beg < line_end && CH(closer_beg) != _T('`')) {
if(CH(closer_beg) != _T(' '))
has_only_space = FALSE;
closer_beg++;
}
closer_end = closer_beg;
while(closer_end < line_end && CH(closer_end) == _T('`'))
closer_end++;
if(closer_end - closer_beg == mark_len) {
/* Success. */
has_space_before_closer = (closer_beg > lines[line_index].beg && CH(closer_beg-1) == _T(' '));
has_eol_before_closer = (closer_beg == lines[line_index].beg);
break;
}
if(closer_end - closer_beg > 0) {
/* We have found a back-tick which is not part of the closer. */
has_only_space = FALSE;
/* But if we eventually fail, remember it as a potential closer
* of its own length for future attempts. This mitigates needs for
* rescans. */
if(closer_end - closer_beg < CODESPAN_MARK_MAXLEN) {
if(closer_beg > last_potential_closers[closer_end - closer_beg - 1])
last_potential_closers[closer_end - closer_beg - 1] = closer_beg;
}
}
if(closer_end >= line_end) {
line_index++;
if(line_index >= n_lines) {
/* Reached end of the paragraph and still nothing. */
*p_reached_paragraph_end = TRUE;
return FALSE;
}
/* Try on the next line. */
line_end = lines[line_index].end;
closer_beg = lines[line_index].beg;
} else {
closer_beg = closer_end;
}
}
/* If there is a space or a new line both after and before the opener
* (and if the code span is not made of spaces only), consume one initial
* and one trailing space as part of the marks. */
if(!has_only_space &&
(has_space_after_opener || has_eol_after_opener) &&
(has_space_before_closer || has_eol_before_closer))
{
if(has_space_after_opener)
opener_end++;
else
opener_end = lines[1].beg;
if(has_space_before_closer)
closer_beg--;
else {
closer_beg = lines[line_index-1].end;
/* We need to eat the preceding "\r\n" but not any line trailing
* spaces. */
while(closer_beg < ctx->size && ISBLANK(closer_beg))
closer_beg++;
}
}
*p_opener_beg = opener_beg;
*p_opener_end = opener_end;
*p_closer_beg = closer_beg;
*p_closer_end = closer_end;
return TRUE;
}
static int
md_is_autolink_uri(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end)
{
OFF off = beg+1;
MD_ASSERT(CH(beg) == _T('<'));
/* Check for scheme. */
if(off >= max_end || !ISASCII(off))
return FALSE;
off++;
while(1) {
if(off >= max_end)
return FALSE;
if(off - beg > 32)
return FALSE;
if(CH(off) == _T(':') && off - beg >= 3)
break;
if(!ISALNUM(off) && CH(off) != _T('+') && CH(off) != _T('-') && CH(off) != _T('.'))
return FALSE;
off++;
}
/* Check the path after the scheme. */
while(off < max_end && CH(off) != _T('>')) {
if(ISWHITESPACE(off) || ISCNTRL(off) || CH(off) == _T('<'))
return FALSE;
off++;
}
if(off >= max_end)
return FALSE;
MD_ASSERT(CH(off) == _T('>'));
*p_end = off+1;
return TRUE;
}
static int
md_is_autolink_email(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end)
{
OFF off = beg + 1;
int label_len;
MD_ASSERT(CH(beg) == _T('<'));
/* The code should correspond to this regexp:
/^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+
@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?
(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/
*/
/* Username (before '@'). */
while(off < max_end && (ISALNUM(off) || ISANYOF(off, _T(".!#$%&'*+/=?^_`{|}~-"))))
off++;
if(off <= beg+1)
return FALSE;
/* '@' */
if(off >= max_end || CH(off) != _T('@'))
return FALSE;
off++;
/* Labels delimited with '.'; each label is sequence of 1 - 63 alnum
* characters or '-', but '-' is not allowed as first or last char. */
label_len = 0;
while(off < max_end) {
if(ISALNUM(off))
label_len++;
else if(CH(off) == _T('-') && label_len > 0)
label_len++;
else if(CH(off) == _T('.') && label_len > 0 && CH(off-1) != _T('-'))
label_len = 0;
else
break;
if(label_len > 63)
return FALSE;
off++;
}
if(label_len <= 0 || off >= max_end || CH(off) != _T('>') || CH(off-1) == _T('-'))
return FALSE;
*p_end = off+1;
return TRUE;
}
static int
md_is_autolink(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end, int* p_missing_mailto)
{
if(md_is_autolink_uri(ctx, beg, max_end, p_end)) {
*p_missing_mailto = FALSE;
return TRUE;
}
if(md_is_autolink_email(ctx, beg, max_end, p_end)) {
*p_missing_mailto = TRUE;
return TRUE;
}
return FALSE;
}
static int
md_collect_marks(MD_CTX* ctx, const MD_LINE* lines, int n_lines, int table_mode)
{
int i;
int ret = 0;
MD_MARK* mark;
OFF codespan_last_potential_closers[CODESPAN_MARK_MAXLEN] = { 0 };
int codespan_scanned_till_paragraph_end = FALSE;
for(i = 0; i < n_lines; i++) {
const MD_LINE* line = &lines[i];
OFF off = line->beg;
OFF line_end = line->end;
while(TRUE) {
CHAR ch;
#ifdef MD4C_USE_UTF16
/* For UTF-16, mark_char_map[] covers only ASCII. */
#define IS_MARK_CHAR(off) ((CH(off) < SIZEOF_ARRAY(ctx->mark_char_map)) && \
(ctx->mark_char_map[(unsigned char) CH(off)]))
#else
/* For 8-bit encodings, mark_char_map[] covers all 256 elements. */
#define IS_MARK_CHAR(off) (ctx->mark_char_map[(unsigned char) CH(off)])
#endif
/* Optimization: Use some loop unrolling. */
while(off + 3 < line_end && !IS_MARK_CHAR(off+0) && !IS_MARK_CHAR(off+1)
&& !IS_MARK_CHAR(off+2) && !IS_MARK_CHAR(off+3))
off += 4;
while(off < line_end && !IS_MARK_CHAR(off+0))
off++;
if(off >= line_end)
break;
ch = CH(off);
/* A backslash escape.
* It can go beyond line->end as it may involve escaped new
* line to form a hard break. */
if(ch == _T('\\') && off+1 < ctx->size && (ISPUNCT(off+1) || ISNEWLINE(off+1))) {
/* Hard-break cannot be on the last line of the block. */
if(!ISNEWLINE(off+1) || i+1 < n_lines)
PUSH_MARK(ch, off, off+2, MD_MARK_RESOLVED);
off += 2;
continue;
}
/* A potential (string) emphasis start/end. */
if(ch == _T('*') || ch == _T('_')) {
OFF tmp = off+1;
int left_level; /* What precedes: 0 = whitespace; 1 = punctuation; 2 = other char. */
int right_level; /* What follows: 0 = whitespace; 1 = punctuation; 2 = other char. */
while(tmp < line_end && CH(tmp) == ch)
tmp++;
if(off == line->beg || ISUNICODEWHITESPACEBEFORE(off))
left_level = 0;
else if(ISUNICODEPUNCTBEFORE(off))
left_level = 1;
else
left_level = 2;
if(tmp == line_end || ISUNICODEWHITESPACE(tmp))
right_level = 0;
else if(ISUNICODEPUNCT(tmp))
right_level = 1;
else
right_level = 2;
/* Intra-word underscore doesn't have special meaning. */
if(ch == _T('_') && left_level == 2 && right_level == 2) {
left_level = 0;
right_level = 0;
}
if(left_level != 0 || right_level != 0) {
unsigned flags = 0;
if(left_level > 0 && left_level >= right_level)
flags |= MD_MARK_POTENTIAL_CLOSER;
if(right_level > 0 && right_level >= left_level)
flags |= MD_MARK_POTENTIAL_OPENER;
if(left_level == 2 && right_level == 2)
flags |= MD_MARK_EMPH_INTRAWORD;
/* For "the rule of three" we need to remember the original
* size of the mark (modulo three), before we potentially
* split the mark when being later resolved partially by some
* shorter closer. */
switch((tmp - off) % 3) {
case 0: flags |= MD_MARK_EMPH_MOD3_0; break;
case 1: flags |= MD_MARK_EMPH_MOD3_1; break;
case 2: flags |= MD_MARK_EMPH_MOD3_2; break;
}
PUSH_MARK(ch, off, tmp, flags);
/* During resolving, multiple asterisks may have to be
* split into independent span start/ends. Consider e.g.
* "**foo* bar*". Therefore we push also some empty dummy
* marks to have enough space for that. */
off++;
while(off < tmp) {
PUSH_MARK('D', off, off, 0);
off++;
}
continue;
}
off = tmp;
continue;
}
/* A potential code span start/end. */
if(ch == _T('`')) {
OFF opener_beg, opener_end;
OFF closer_beg, closer_end;
int is_code_span;
is_code_span = md_is_code_span(ctx, lines + i, n_lines - i, off,
&opener_beg, &opener_end, &closer_beg, &closer_end,
codespan_last_potential_closers,
&codespan_scanned_till_paragraph_end);
if(is_code_span) {
PUSH_MARK(_T('`'), opener_beg, opener_end, MD_MARK_OPENER | MD_MARK_RESOLVED);
PUSH_MARK(_T('`'), closer_beg, closer_end, MD_MARK_CLOSER | MD_MARK_RESOLVED);
ctx->marks[ctx->n_marks-2].next = ctx->n_marks-1;
ctx->marks[ctx->n_marks-1].prev = ctx->n_marks-2;
off = closer_end;
/* Advance the current line accordingly. */
while(off > line_end) {
i++;
line++;
line_end = line->end;
}
continue;
}
off = opener_end;
continue;
}
/* A potential entity start. */
if(ch == _T('&')) {
PUSH_MARK(ch, off, off+1, MD_MARK_POTENTIAL_OPENER);
off++;
continue;
}
/* A potential entity end. */
if(ch == _T(';')) {
/* We surely cannot be entity unless the previous mark is '&'. */
if(ctx->n_marks > 0 && ctx->marks[ctx->n_marks-1].ch == _T('&'))
PUSH_MARK(ch, off, off+1, MD_MARK_POTENTIAL_CLOSER);
off++;
continue;
}
/* A potential autolink or raw HTML start/end. */
if(ch == _T('<')) {
int is_autolink;
OFF autolink_end;
int missing_mailto;
if(!(ctx->parser.flags & MD_FLAG_NOHTMLSPANS)) {
int is_html;
OFF html_end;
/* Given the nature of the raw HTML, we have to recognize
* it here. Doing so later in md_analyze_lt_gt() could
* open can of worms of quadratic complexity. */
is_html = md_is_html_any(ctx, lines + i, n_lines - i, off,
lines[n_lines-1].end, &html_end);
if(is_html) {
PUSH_MARK(_T('<'), off, off, MD_MARK_OPENER | MD_MARK_RESOLVED);
PUSH_MARK(_T('>'), html_end, html_end, MD_MARK_CLOSER | MD_MARK_RESOLVED);
ctx->marks[ctx->n_marks-2].next = ctx->n_marks-1;
ctx->marks[ctx->n_marks-1].prev = ctx->n_marks-2;
off = html_end;
/* Advance the current line accordingly. */
while(off > line_end) {
i++;
line++;
line_end = line->end;
}
continue;
}
}
is_autolink = md_is_autolink(ctx, off, lines[n_lines-1].end,
&autolink_end, &missing_mailto);
if(is_autolink) {
PUSH_MARK((missing_mailto ? _T('@') : _T('<')), off, off+1,
MD_MARK_OPENER | MD_MARK_RESOLVED | MD_MARK_AUTOLINK);
PUSH_MARK(_T('>'), autolink_end-1, autolink_end,
MD_MARK_CLOSER | MD_MARK_RESOLVED | MD_MARK_AUTOLINK);
ctx->marks[ctx->n_marks-2].next = ctx->n_marks-1;
ctx->marks[ctx->n_marks-1].prev = ctx->n_marks-2;
off = autolink_end;
continue;
}
off++;
continue;
}
/* A potential link or its part. */
if(ch == _T('[') || (ch == _T('!') && off+1 < line_end && CH(off+1) == _T('['))) {
OFF tmp = (ch == _T('[') ? off+1 : off+2);
PUSH_MARK(ch, off, tmp, MD_MARK_POTENTIAL_OPENER);
off = tmp;
/* Two dummies to make enough place for data we need if it is
* a link. */
PUSH_MARK('D', off, off, 0);
PUSH_MARK('D', off, off, 0);
continue;
}
if(ch == _T(']')) {
PUSH_MARK(ch, off, off+1, MD_MARK_POTENTIAL_CLOSER);
off++;
continue;
}
/* A potential permissive e-mail autolink. */
if(ch == _T('@')) {
if(line->beg + 1 <= off && ISALNUM(off-1) &&
off + 3 < line->end && ISALNUM(off+1))
{
PUSH_MARK(ch, off, off+1, MD_MARK_POTENTIAL_OPENER);
/* Push a dummy as a reserve for a closer. */
PUSH_MARK('D', off, off, 0);
}
off++;
continue;
}
/* A potential permissive URL autolink. */
if(ch == _T(':')) {
static struct {
const CHAR* scheme;
SZ scheme_size;
const CHAR* suffix;
SZ suffix_size;
} scheme_map[] = {
/* In the order from the most frequently used, arguably. */
{ _T("http"), 4, _T("//"), 2 },
{ _T("https"), 5, _T("//"), 2 },
{ _T("ftp"), 3, _T("//"), 2 }
};
int scheme_index;
for(scheme_index = 0; scheme_index < (int) SIZEOF_ARRAY(scheme_map); scheme_index++) {
const CHAR* scheme = scheme_map[scheme_index].scheme;
const SZ scheme_size = scheme_map[scheme_index].scheme_size;
const CHAR* suffix = scheme_map[scheme_index].suffix;
const SZ suffix_size = scheme_map[scheme_index].suffix_size;
if(line->beg + scheme_size <= off && md_ascii_eq(STR(off-scheme_size), scheme, scheme_size) &&
(line->beg + scheme_size == off || ISWHITESPACE(off-scheme_size-1) || ISANYOF(off-scheme_size-1, _T("*_~(["))) &&
off + 1 + suffix_size < line->end && md_ascii_eq(STR(off+1), suffix, suffix_size))
{
PUSH_MARK(ch, off-scheme_size, off+1+suffix_size, MD_MARK_POTENTIAL_OPENER);
/* Push a dummy as a reserve for a closer. */
PUSH_MARK('D', off, off, 0);
off += 1 + suffix_size;
continue;
}
}
off++;
continue;
}
/* A potential permissive WWW autolink. */
if(ch == _T('.')) {
if(line->beg + 3 <= off && md_ascii_eq(STR(off-3), _T("www"), 3) &&
(line->beg + 3 == off || ISWHITESPACE(off-4) || ISANYOF(off-4, _T("*_~(["))) &&
off + 1 < line_end)
{
PUSH_MARK(ch, off-3, off+1, MD_MARK_POTENTIAL_OPENER);
/* Push a dummy as a reserve for a closer. */
PUSH_MARK('D', off, off, 0);
off++;
continue;
}
off++;
continue;
}
/* A potential table cell boundary or wiki link label delimiter. */
if((table_mode || ctx->parser.flags & MD_FLAG_WIKILINKS) && ch == _T('|')) {
PUSH_MARK(ch, off, off+1, 0);
off++;
continue;
}
/* A potential strikethrough start/end. */
if(ch == _T('~')) {
OFF tmp = off+1;
while(tmp < line_end && CH(tmp) == _T('~'))
tmp++;
if(tmp - off < 3) {
unsigned flags = 0;
if(tmp < line_end && !ISUNICODEWHITESPACE(tmp))
flags |= MD_MARK_POTENTIAL_OPENER;
if(off > line->beg && !ISUNICODEWHITESPACEBEFORE(off))
flags |= MD_MARK_POTENTIAL_CLOSER;
if(flags != 0)
PUSH_MARK(ch, off, tmp, flags);
}
off = tmp;
continue;
}
/* A potential equation start/end */
if(ch == _T('$')) {
/* We can have at most two consecutive $ signs,
* where two dollar signs signify a display equation. */
OFF tmp = off+1;
while(tmp < line_end && CH(tmp) == _T('$'))
tmp++;
if (tmp - off <= 2)
PUSH_MARK(ch, off, tmp, MD_MARK_POTENTIAL_OPENER | MD_MARK_POTENTIAL_CLOSER);
off = tmp;
continue;
}
/* Turn non-trivial whitespace into single space. */
if(ISWHITESPACE_(ch)) {
OFF tmp = off+1;
while(tmp < line_end && ISWHITESPACE(tmp))
tmp++;
if(tmp - off > 1 || ch != _T(' '))
PUSH_MARK(ch, off, tmp, MD_MARK_RESOLVED);
off = tmp;
continue;
}
/* NULL character. */
if(ch == _T('\0')) {
PUSH_MARK(ch, off, off+1, MD_MARK_RESOLVED);
off++;
continue;
}
off++;
}
}
/* Add a dummy mark at the end of the mark vector to simplify
* process_inlines(). */
PUSH_MARK(127, ctx->size, ctx->size, MD_MARK_RESOLVED);
abort:
return ret;
}
static void
md_analyze_bracket(MD_CTX* ctx, int mark_index)
{
/* We cannot really resolve links here as for that we would need
* more context. E.g. a following pair of brackets (reference link),
* or enclosing pair of brackets (if the inner is the link, the outer
* one cannot be.)
*
* Therefore we here only construct a list of resolved '[' ']' pairs
* ordered by position of the closer. This allows ur to analyze what is
* or is not link in the right order, from inside to outside in case
* of nested brackets.
*
* The resolving itself is deferred into md_resolve_links().
*/
MD_MARK* mark = &ctx->marks[mark_index];
if(mark->flags & MD_MARK_POTENTIAL_OPENER) {
md_mark_chain_append(ctx, &BRACKET_OPENERS, mark_index);
return;
}
if(BRACKET_OPENERS.tail >= 0) {
/* Pop the opener from the chain. */
int opener_index = BRACKET_OPENERS.tail;
MD_MARK* opener = &ctx->marks[opener_index];
if(opener->prev >= 0)
ctx->marks[opener->prev].next = -1;
else
BRACKET_OPENERS.head = -1;
BRACKET_OPENERS.tail = opener->prev;
/* Interconnect the opener and closer. */
opener->next = mark_index;
mark->prev = opener_index;
/* Add the pair into chain of potential links for md_resolve_links().
* Note we misuse opener->prev for this as opener->next points to its
* closer. */
if(ctx->unresolved_link_tail >= 0)
ctx->marks[ctx->unresolved_link_tail].prev = opener_index;
else
ctx->unresolved_link_head = opener_index;
ctx->unresolved_link_tail = opener_index;
opener->prev = -1;
}
}
/* Forward declaration. */
static void md_analyze_link_contents(MD_CTX* ctx, const MD_LINE* lines, int n_lines,
int mark_beg, int mark_end);
static int
md_resolve_links(MD_CTX* ctx, const MD_LINE* lines, int n_lines)
{
int opener_index = ctx->unresolved_link_head;
OFF last_link_beg = 0;
OFF last_link_end = 0;
OFF last_img_beg = 0;
OFF last_img_end = 0;
while(opener_index >= 0) {
MD_MARK* opener = &ctx->marks[opener_index];
int closer_index = opener->next;
MD_MARK* closer = &ctx->marks[closer_index];
int next_index = opener->prev;
MD_MARK* next_opener;
MD_MARK* next_closer;
MD_LINK_ATTR attr;
int is_link = FALSE;
if(next_index >= 0) {
next_opener = &ctx->marks[next_index];
next_closer = &ctx->marks[next_opener->next];
} else {
next_opener = NULL;
next_closer = NULL;
}
/* If nested ("[ [ ] ]"), we need to make sure that:
* - The outer does not end inside of (...) belonging to the inner.
* - The outer cannot be link if the inner is link (i.e. not image).
*
* (Note we here analyze from inner to outer as the marks are ordered
* by closer->beg.)
*/
if((opener->beg < last_link_beg && closer->end < last_link_end) ||
(opener->beg < last_img_beg && closer->end < last_img_end) ||
(opener->beg < last_link_end && opener->ch == '['))
{
opener_index = next_index;
continue;
}
/* Recognize and resolve wiki links.
* Wiki-links maybe '[[destination]]' or '[[destination|label]]'.
*/
if ((ctx->parser.flags & MD_FLAG_WIKILINKS) &&
(opener->end - opener->beg == 1) && /* not image */
next_opener != NULL && /* double '[' opener */
next_opener->ch == '[' &&
(next_opener->beg == opener->beg - 1) &&
(next_opener->end - next_opener->beg == 1) &&
next_closer != NULL && /* double ']' closer */
next_closer->ch == ']' &&
(next_closer->beg == closer->beg + 1) &&
(next_closer->end - next_closer->beg == 1))
{
MD_MARK* delim = NULL;
int delim_index;
OFF dest_beg, dest_end;
is_link = TRUE;
/* We don't allow destination to be longer than 100 characters.
* Lets scan to see whether there is '|'. (If not then the whole
* wiki-link has to be below the 100 characters.) */
delim_index = opener_index + 1;
while(delim_index < closer_index) {
MD_MARK* m = &ctx->marks[delim_index];
if(m->ch == '|') {
delim = m;
break;
}
if(m->ch != 'D' && m->beg - opener->end > 100)
break;
delim_index++;
}
dest_beg = opener->end;
dest_end = (delim != NULL) ? delim->beg : closer->beg;
if(dest_end - dest_beg == 0 || dest_end - dest_beg > 100)
is_link = FALSE;
/* There may not be any new line in the destination. */
if(is_link) {
OFF off;
for(off = dest_beg; off < dest_end; off++) {
if(ISNEWLINE(off)) {
is_link = FALSE;
break;
}
}
}
if(is_link) {
if(delim != NULL) {
if(delim->end < closer->beg) {
opener->end = delim->beg;
} else {
/* The pipe is just before the closer: [[foo|]] */
closer->beg = delim->beg;
delim = NULL;
}
}
opener->beg = next_opener->beg;
opener->next = closer_index;
opener->flags |= MD_MARK_OPENER | MD_MARK_RESOLVED;
closer->end = next_closer->end;
closer->prev = opener_index;
closer->flags |= MD_MARK_CLOSER | MD_MARK_RESOLVED;
last_link_beg = opener->beg;
last_link_end = closer->end;
if(delim != NULL) {
delim->flags |= MD_MARK_RESOLVED;
md_rollback(ctx, opener_index, delim_index, MD_ROLLBACK_ALL);
md_analyze_link_contents(ctx, lines, n_lines, opener_index+1, closer_index);
} else {
md_rollback(ctx, opener_index, closer_index, MD_ROLLBACK_ALL);
}
opener_index = next_opener->prev;
continue;
}
}
if(next_opener != NULL && next_opener->beg == closer->end) {
if(next_closer->beg > closer->end + 1) {
/* Might be full reference link. */
is_link = md_is_link_reference(ctx, lines, n_lines, next_opener->beg, next_closer->end, &attr);
} else {
/* Might be shortcut reference link. */
is_link = md_is_link_reference(ctx, lines, n_lines, opener->beg, closer->end, &attr);
}
if(is_link < 0)
return -1;
if(is_link) {
/* Eat the 2nd "[...]". */
closer->end = next_closer->end;
}
} else {
if(closer->end < ctx->size && CH(closer->end) == _T('(')) {
/* Might be inline link. */
OFF inline_link_end = UINT_MAX;
is_link = md_is_inline_link_spec(ctx, lines, n_lines, closer->end, &inline_link_end, &attr);
if(is_link < 0)
return -1;
/* Check the closing ')' is not inside an already resolved range
* (i.e. a range with a higher priority), e.g. a code span. */
if(is_link) {
int i = closer_index + 1;
while(i < ctx->n_marks) {
MD_MARK* mark = &ctx->marks[i];
if(mark->beg >= inline_link_end)
break;
if((mark->flags & (MD_MARK_OPENER | MD_MARK_RESOLVED)) == (MD_MARK_OPENER | MD_MARK_RESOLVED)) {
if(ctx->marks[mark->next].beg >= inline_link_end) {
/* Cancel the link status. */
if(attr.title_needs_free)
free(attr.title);
is_link = FALSE;
break;
}
i = mark->next + 1;
} else {
i++;
}
}
}
if(is_link) {
/* Eat the "(...)" */
closer->end = inline_link_end;
}
}
if(!is_link) {
/* Might be collapsed reference link. */
is_link = md_is_link_reference(ctx, lines, n_lines, opener->beg, closer->end, &attr);
if(is_link < 0)
return -1;
}
}
if(is_link) {
/* Resolve the brackets as a link. */
opener->flags |= MD_MARK_OPENER | MD_MARK_RESOLVED;
closer->flags |= MD_MARK_CLOSER | MD_MARK_RESOLVED;
/* If it is a link, we store the destination and title in the two
* dummy marks after the opener. */
MD_ASSERT(ctx->marks[opener_index+1].ch == 'D');
ctx->marks[opener_index+1].beg = attr.dest_beg;
ctx->marks[opener_index+1].end = attr.dest_end;
MD_ASSERT(ctx->marks[opener_index+2].ch == 'D');
md_mark_store_ptr(ctx, opener_index+2, attr.title);
/* The title might or might not have been allocated for us. */
if(attr.title_needs_free)
md_mark_chain_append(ctx, &PTR_CHAIN, opener_index+2);
ctx->marks[opener_index+2].prev = attr.title_size;
if(opener->ch == '[') {
last_link_beg = opener->beg;
last_link_end = closer->end;
} else {
last_img_beg = opener->beg;
last_img_end = closer->end;
}
md_analyze_link_contents(ctx, lines, n_lines, opener_index+1, closer_index);
}
opener_index = next_index;
}
return 0;
}
/* Analyze whether the mark '&' starts a HTML entity.
* If so, update its flags as well as flags of corresponding closer ';'. */
static void
md_analyze_entity(MD_CTX* ctx, int mark_index)
{
MD_MARK* opener = &ctx->marks[mark_index];
MD_MARK* closer;
OFF off;
/* Cannot be entity if there is no closer as the next mark.
* (Any other mark between would mean strange character which cannot be
* part of the entity.
*
* So we can do all the work on '&' and do not call this later for the
* closing mark ';'.
*/
if(mark_index + 1 >= ctx->n_marks)
return;
closer = &ctx->marks[mark_index+1];
if(closer->ch != ';')
return;
if(md_is_entity(ctx, opener->beg, closer->end, &off)) {
MD_ASSERT(off == closer->end);
md_resolve_range(ctx, NULL, mark_index, mark_index+1);
opener->end = closer->end;
}
}
static void
md_analyze_table_cell_boundary(MD_CTX* ctx, int mark_index)
{
MD_MARK* mark = &ctx->marks[mark_index];
mark->flags |= MD_MARK_RESOLVED;
md_mark_chain_append(ctx, &TABLECELLBOUNDARIES, mark_index);
ctx->n_table_cell_boundaries++;
}
/* Split a longer mark into two. The new mark takes the given count of
* characters. May only be called if an adequate number of dummy 'D' marks
* follows.
*/
static int
md_split_emph_mark(MD_CTX* ctx, int mark_index, SZ n)
{
MD_MARK* mark = &ctx->marks[mark_index];
int new_mark_index = mark_index + (mark->end - mark->beg - n);
MD_MARK* dummy = &ctx->marks[new_mark_index];
MD_ASSERT(mark->end - mark->beg > n);
MD_ASSERT(dummy->ch == 'D');
memcpy(dummy, mark, sizeof(MD_MARK));
mark->end -= n;
dummy->beg = mark->end;
return new_mark_index;
}
static void
md_analyze_emph(MD_CTX* ctx, int mark_index)
{
MD_MARK* mark = &ctx->marks[mark_index];
MD_MARKCHAIN* chain = md_mark_chain(ctx, mark_index);
/* If we can be a closer, try to resolve with the preceding opener. */
if(mark->flags & MD_MARK_POTENTIAL_CLOSER) {
MD_MARK* opener = NULL;
int opener_index;
if(mark->ch == _T('*')) {
MD_MARKCHAIN* opener_chains[6];
int i, n_opener_chains;
unsigned flags = mark->flags;
/* Apply the "rule of three". */
n_opener_chains = 0;
opener_chains[n_opener_chains++] = &ASTERISK_OPENERS_intraword_mod3_0;
if((flags & MD_MARK_EMPH_MOD3_MASK) != MD_MARK_EMPH_MOD3_2)
opener_chains[n_opener_chains++] = &ASTERISK_OPENERS_intraword_mod3_1;
if((flags & MD_MARK_EMPH_MOD3_MASK) != MD_MARK_EMPH_MOD3_1)
opener_chains[n_opener_chains++] = &ASTERISK_OPENERS_intraword_mod3_2;
opener_chains[n_opener_chains++] = &ASTERISK_OPENERS_extraword_mod3_0;
if(!(flags & MD_MARK_EMPH_INTRAWORD) || (flags & MD_MARK_EMPH_MOD3_MASK) != MD_MARK_EMPH_MOD3_2)
opener_chains[n_opener_chains++] = &ASTERISK_OPENERS_extraword_mod3_1;
if(!(flags & MD_MARK_EMPH_INTRAWORD) || (flags & MD_MARK_EMPH_MOD3_MASK) != MD_MARK_EMPH_MOD3_1)
opener_chains[n_opener_chains++] = &ASTERISK_OPENERS_extraword_mod3_2;
/* Opener is the most recent mark from the allowed chains. */
for(i = 0; i < n_opener_chains; i++) {
if(opener_chains[i]->tail >= 0) {
int tmp_index = opener_chains[i]->tail;
MD_MARK* tmp_mark = &ctx->marks[tmp_index];
if(opener == NULL || tmp_mark->end > opener->end) {
opener_index = tmp_index;
opener = tmp_mark;
}
}
}
} else {
/* Simple emph. mark */
if(chain->tail >= 0) {
opener_index = chain->tail;
opener = &ctx->marks[opener_index];
}
}
/* Resolve, if we have found matching opener. */
if(opener != NULL) {
SZ opener_size = opener->end - opener->beg;
SZ closer_size = mark->end - mark->beg;
MD_MARKCHAIN* opener_chain = md_mark_chain(ctx, opener_index);
if(opener_size > closer_size) {
opener_index = md_split_emph_mark(ctx, opener_index, closer_size);
md_mark_chain_append(ctx, opener_chain, opener_index);
} else if(opener_size < closer_size) {
md_split_emph_mark(ctx, mark_index, closer_size - opener_size);
}
md_rollback(ctx, opener_index, mark_index, MD_ROLLBACK_CROSSING);
md_resolve_range(ctx, opener_chain, opener_index, mark_index);
return;
}
}
/* If we could not resolve as closer, we may be yet be an opener. */
if(mark->flags & MD_MARK_POTENTIAL_OPENER)
md_mark_chain_append(ctx, chain, mark_index);
}
static void
md_analyze_tilde(MD_CTX* ctx, int mark_index)
{
MD_MARK* mark = &ctx->marks[mark_index];
MD_MARKCHAIN* chain = md_mark_chain(ctx, mark_index);
/* We attempt to be Github Flavored Markdown compatible here. GFM accepts
* only tildes sequences of length 1 and 2, and the length of the opener
* and closer has to match. */
if((mark->flags & MD_MARK_POTENTIAL_CLOSER) && chain->head >= 0) {
int opener_index = chain->head;
md_rollback(ctx, opener_index, mark_index, MD_ROLLBACK_CROSSING);
md_resolve_range(ctx, chain, opener_index, mark_index);
return;
}
if(mark->flags & MD_MARK_POTENTIAL_OPENER)
md_mark_chain_append(ctx, chain, mark_index);
}
static void
md_analyze_dollar(MD_CTX* ctx, int mark_index)
{
/* This should mimic the way inline equations work in LaTeX, so there
* can only ever be one item in the chain (i.e. the dollars can't be
* nested). This is basically the same as the md_analyze_tilde function,
* except that we require matching openers and closers to be of the same
* length.
*
* E.g.: $abc$$def$$ => abc (display equation) def (end equation) */
if(DOLLAR_OPENERS.head >= 0) {
/* If the potential closer has a non-matching number of $, discard */
MD_MARK* open = &ctx->marks[DOLLAR_OPENERS.head];
MD_MARK* close = &ctx->marks[mark_index];
int opener_index = DOLLAR_OPENERS.head;
md_rollback(ctx, opener_index, mark_index, MD_ROLLBACK_ALL);
if (open->end - open->beg == close->end - close->beg) {
/* We are the matching closer */
md_resolve_range(ctx, &DOLLAR_OPENERS, opener_index, mark_index);
} else {
/* We don't match the opener, so discard old opener and insert as opener */
md_mark_chain_append(ctx, &DOLLAR_OPENERS, mark_index);
}
} else {
/* No unmatched openers, so we are opener */
md_mark_chain_append(ctx, &DOLLAR_OPENERS, mark_index);
}
}
static void
md_analyze_permissive_url_autolink(MD_CTX* ctx, int mark_index)
{
MD_MARK* opener = &ctx->marks[mark_index];
int closer_index = mark_index + 1;
MD_MARK* closer = &ctx->marks[closer_index];
MD_MARK* next_resolved_mark;
OFF off = opener->end;
int n_dots = FALSE;
int has_underscore_in_last_seg = FALSE;
int has_underscore_in_next_to_last_seg = FALSE;
int n_opened_parenthesis = 0;
/* Check for domain. */
while(off < ctx->size) {
if(ISALNUM(off) || CH(off) == _T('-')) {
off++;
} else if(CH(off) == _T('.')) {
/* We must see at least one period. */
n_dots++;
has_underscore_in_next_to_last_seg = has_underscore_in_last_seg;
has_underscore_in_last_seg = FALSE;
off++;
} else if(CH(off) == _T('_')) {
/* No underscore may be present in the last two domain segments. */
has_underscore_in_last_seg = TRUE;
off++;
} else {
break;
}
}
if(off > opener->end && CH(off-1) == _T('.')) {
off--;
n_dots--;
}
if(off <= opener->end || n_dots == 0 || has_underscore_in_next_to_last_seg || has_underscore_in_last_seg)
return;
/* Check for path. */
next_resolved_mark = closer + 1;
while(next_resolved_mark->ch == 'D' || !(next_resolved_mark->flags & MD_MARK_RESOLVED))
next_resolved_mark++;
while(off < next_resolved_mark->beg && CH(off) != _T('<') && !ISWHITESPACE(off) && !ISNEWLINE(off)) {
/* Parenthesis must be balanced. */
if(CH(off) == _T('(')) {
n_opened_parenthesis++;
} else if(CH(off) == _T(')')) {
if(n_opened_parenthesis > 0)
n_opened_parenthesis--;
else
break;
}
off++;
}
/* These cannot be last char In such case they are more likely normal
* punctuation. */
if(ISANYOF(off-1, _T("?!.,:*_~")))
off--;
/* Ok. Lets call it auto-link. Adapt opener and create closer to zero
* length so all the contents becomes the link text. */
MD_ASSERT(closer->ch == 'D');
opener->end = opener->beg;
closer->ch = opener->ch;
closer->beg = off;
closer->end = off;
md_resolve_range(ctx, NULL, mark_index, closer_index);
}
/* The permissive autolinks do not have to be enclosed in '<' '>' but we
* instead impose stricter rules what is understood as an e-mail address
* here. Actually any non-alphanumeric characters with exception of '.'
* are prohibited both in username and after '@'. */
static void
md_analyze_permissive_email_autolink(MD_CTX* ctx, int mark_index)
{
MD_MARK* opener = &ctx->marks[mark_index];
int closer_index;
MD_MARK* closer;
OFF beg = opener->beg;
OFF end = opener->end;
int dot_count = 0;
MD_ASSERT(CH(beg) == _T('@'));
/* Scan for name before '@'. */
while(beg > 0 && (ISALNUM(beg-1) || ISANYOF(beg-1, _T(".-_+"))))
beg--;
/* Scan for domain after '@'. */
while(end < ctx->size && (ISALNUM(end) || ISANYOF(end, _T(".-_")))) {
if(CH(end) == _T('.'))
dot_count++;
end++;
}
if(CH(end-1) == _T('.')) { /* Final '.' not part of it. */
dot_count--;
end--;
}
else if(ISANYOF2(end-1, _T('-'), _T('_'))) /* These are forbidden at the end. */
return;
if(CH(end-1) == _T('@') || dot_count == 0)
return;
/* Ok. Lets call it auto-link. Adapt opener and create closer to zero
* length so all the contents becomes the link text. */
closer_index = mark_index + 1;
closer = &ctx->marks[closer_index];
MD_ASSERT(closer->ch == 'D');
opener->beg = beg;
opener->end = beg;
closer->ch = opener->ch;
closer->beg = end;
closer->end = end;
md_resolve_range(ctx, NULL, mark_index, closer_index);
}
static inline void
md_analyze_marks(MD_CTX* ctx, const MD_LINE* lines, int n_lines,
int mark_beg, int mark_end, const CHAR* mark_chars)
{
int i = mark_beg;
while(i < mark_end) {
MD_MARK* mark = &ctx->marks[i];
/* Skip resolved spans. */
if(mark->flags & MD_MARK_RESOLVED) {
if(mark->flags & MD_MARK_OPENER) {
MD_ASSERT(i < mark->next);
i = mark->next + 1;
} else {
i++;
}
continue;
}
/* Skip marks we do not want to deal with. */
if(!ISANYOF_(mark->ch, mark_chars)) {
i++;
continue;
}
/* Analyze the mark. */
switch(mark->ch) {
case '[': /* Pass through. */
case '!': /* Pass through. */
case ']': md_analyze_bracket(ctx, i); break;
case '&': md_analyze_entity(ctx, i); break;
case '|': md_analyze_table_cell_boundary(ctx, i); break;
case '_': /* Pass through. */
case '*': md_analyze_emph(ctx, i); break;
case '~': md_analyze_tilde(ctx, i); break;
case '$': md_analyze_dollar(ctx, i); break;
case '.': /* Pass through. */
case ':': md_analyze_permissive_url_autolink(ctx, i); break;
case '@': md_analyze_permissive_email_autolink(ctx, i); break;
}
i++;
}
}
/* Analyze marks (build ctx->marks). */
static int
md_analyze_inlines(MD_CTX* ctx, const MD_LINE* lines, int n_lines, int table_mode)
{
int ret;
/* Reset the previously collected stack of marks. */
ctx->n_marks = 0;
/* Collect all marks. */
MD_CHECK(md_collect_marks(ctx, lines, n_lines, table_mode));
/* We analyze marks in few groups to handle their precedence. */
/* (1) Entities; code spans; autolinks; raw HTML. */
md_analyze_marks(ctx, lines, n_lines, 0, ctx->n_marks, _T("&"));
/* (2) Links. */
md_analyze_marks(ctx, lines, n_lines, 0, ctx->n_marks, _T("[]!"));
MD_CHECK(md_resolve_links(ctx, lines, n_lines));
BRACKET_OPENERS.head = -1;
BRACKET_OPENERS.tail = -1;
ctx->unresolved_link_head = -1;
ctx->unresolved_link_tail = -1;
if(table_mode) {
/* (3) Analyze table cell boundaries.
* Note we reset TABLECELLBOUNDARIES chain prior to the call md_analyze_marks(),
* not after, because caller may need it. */
MD_ASSERT(n_lines == 1);
TABLECELLBOUNDARIES.head = -1;
TABLECELLBOUNDARIES.tail = -1;
ctx->n_table_cell_boundaries = 0;
md_analyze_marks(ctx, lines, n_lines, 0, ctx->n_marks, _T("|"));
return ret;
}
/* (4) Emphasis and strong emphasis; permissive autolinks. */
md_analyze_link_contents(ctx, lines, n_lines, 0, ctx->n_marks);
abort:
return ret;
}
static void
md_analyze_link_contents(MD_CTX* ctx, const MD_LINE* lines, int n_lines,
int mark_beg, int mark_end)
{
int i;
md_analyze_marks(ctx, lines, n_lines, mark_beg, mark_end, _T("*_~$@:."));
for(i = OPENERS_CHAIN_FIRST; i <= OPENERS_CHAIN_LAST; i++) {
ctx->mark_chains[i].head = -1;
ctx->mark_chains[i].tail = -1;
}
}
static int
md_enter_leave_span_a(MD_CTX* ctx, int enter, MD_SPANTYPE type,
const CHAR* dest, SZ dest_size, int prohibit_escapes_in_dest,
const CHAR* title, SZ title_size)
{
MD_ATTRIBUTE_BUILD href_build = { 0 };
MD_ATTRIBUTE_BUILD title_build = { 0 };
MD_SPAN_A_DETAIL det;
int ret = 0;
/* Note we here rely on fact that MD_SPAN_A_DETAIL and
* MD_SPAN_IMG_DETAIL are binary-compatible. */
memset(&det, 0, sizeof(MD_SPAN_A_DETAIL));
MD_CHECK(md_build_attribute(ctx, dest, dest_size,
(prohibit_escapes_in_dest ? MD_BUILD_ATTR_NO_ESCAPES : 0),
&det.href, &href_build));
MD_CHECK(md_build_attribute(ctx, title, title_size, 0, &det.title, &title_build));
if(enter)
MD_ENTER_SPAN(type, &det);
else
MD_LEAVE_SPAN(type, &det);
abort:
md_free_attribute(ctx, &href_build);
md_free_attribute(ctx, &title_build);
return ret;
}
static int
md_enter_leave_span_wikilink(MD_CTX* ctx, int enter, const CHAR* target, SZ target_size)
{
MD_ATTRIBUTE_BUILD target_build = { 0 };
MD_SPAN_WIKILINK_DETAIL det;
int ret = 0;
memset(&det, 0, sizeof(MD_SPAN_WIKILINK_DETAIL));
MD_CHECK(md_build_attribute(ctx, target, target_size, 0, &det.target, &target_build));
if (enter)
MD_ENTER_SPAN(MD_SPAN_WIKILINK, &det);
else
MD_LEAVE_SPAN(MD_SPAN_WIKILINK, &det);
abort:
md_free_attribute(ctx, &target_build);
return ret;
}
/* Render the output, accordingly to the analyzed ctx->marks. */
static int
md_process_inlines(MD_CTX* ctx, const MD_LINE* lines, int n_lines)
{
MD_TEXTTYPE text_type;
const MD_LINE* line = lines;
MD_MARK* prev_mark = NULL;
MD_MARK* mark;
OFF off = lines[0].beg;
OFF end = lines[n_lines-1].end;
int enforce_hardbreak = 0;
int ret = 0;
/* Find first resolved mark. Note there is always at least one resolved
* mark, the dummy last one after the end of the latest line we actually
* never really reach. This saves us of a lot of special checks and cases
* in this function. */
mark = ctx->marks;
while(!(mark->flags & MD_MARK_RESOLVED))
mark++;
text_type = MD_TEXT_NORMAL;
while(1) {
/* Process the text up to the next mark or end-of-line. */
OFF tmp = (line->end < mark->beg ? line->end : mark->beg);
if(tmp > off) {
MD_TEXT(text_type, STR(off), tmp - off);
off = tmp;
}
/* If reached the mark, process it and move to next one. */
if(off >= mark->beg) {
switch(mark->ch) {
case '\\': /* Backslash escape. */
if(ISNEWLINE(mark->beg+1))
enforce_hardbreak = 1;
else
MD_TEXT(text_type, STR(mark->beg+1), 1);
break;
case ' ': /* Non-trivial space. */
MD_TEXT(text_type, _T(" "), 1);
break;
case '`': /* Code span. */
if(mark->flags & MD_MARK_OPENER) {
MD_ENTER_SPAN(MD_SPAN_CODE, NULL);
text_type = MD_TEXT_CODE;
} else {
MD_LEAVE_SPAN(MD_SPAN_CODE, NULL);
text_type = MD_TEXT_NORMAL;
}
break;
case '_': /* Underline (or emphasis if we fall through). */
if(ctx->parser.flags & MD_FLAG_UNDERLINE) {
if(mark->flags & MD_MARK_OPENER) {
while(off < mark->end) {
MD_ENTER_SPAN(MD_SPAN_U, NULL);
off++;
}
} else {
while(off < mark->end) {
MD_LEAVE_SPAN(MD_SPAN_U, NULL);
off++;
}
}
break;
}
/* Fall though. */
case '*': /* Emphasis, strong emphasis. */
if(mark->flags & MD_MARK_OPENER) {
if((mark->end - off) % 2) {
MD_ENTER_SPAN(MD_SPAN_EM, NULL);
off++;
}
while(off + 1 < mark->end) {
MD_ENTER_SPAN(MD_SPAN_STRONG, NULL);
off += 2;
}
} else {
while(off + 1 < mark->end) {
MD_LEAVE_SPAN(MD_SPAN_STRONG, NULL);
off += 2;
}
if((mark->end - off) % 2) {
MD_LEAVE_SPAN(MD_SPAN_EM, NULL);
off++;
}
}
break;
case '~':
if(mark->flags & MD_MARK_OPENER)
MD_ENTER_SPAN(MD_SPAN_DEL, NULL);
else
MD_LEAVE_SPAN(MD_SPAN_DEL, NULL);
break;
case '$':
if(mark->flags & MD_MARK_OPENER) {
MD_ENTER_SPAN((mark->end - off) % 2 ? MD_SPAN_LATEXMATH : MD_SPAN_LATEXMATH_DISPLAY, NULL);
text_type = MD_TEXT_LATEXMATH;
} else {
MD_LEAVE_SPAN((mark->end - off) % 2 ? MD_SPAN_LATEXMATH : MD_SPAN_LATEXMATH_DISPLAY, NULL);
text_type = MD_TEXT_NORMAL;
}
break;
case '[': /* Link, wiki link, image. */
case '!':
case ']':
{
const MD_MARK* opener = (mark->ch != ']' ? mark : &ctx->marks[mark->prev]);
const MD_MARK* closer = &ctx->marks[opener->next];
const MD_MARK* dest_mark;
const MD_MARK* title_mark;
if ((opener->ch == '[' && closer->ch == ']') &&
opener->end - opener->beg >= 2 &&
closer->end - closer->beg >= 2)
{
int has_label = (opener->end - opener->beg > 2);
SZ target_sz;
if(has_label)
target_sz = opener->end - (opener->beg+2);
else
target_sz = closer->beg - opener->end;
MD_CHECK(md_enter_leave_span_wikilink(ctx, (mark->ch != ']'),
has_label ? STR(opener->beg+2) : STR(opener->end),
target_sz));
break;
}
dest_mark = opener+1;
MD_ASSERT(dest_mark->ch == 'D');
title_mark = opener+2;
MD_ASSERT(title_mark->ch == 'D');
MD_CHECK(md_enter_leave_span_a(ctx, (mark->ch != ']'),
(opener->ch == '!' ? MD_SPAN_IMG : MD_SPAN_A),
STR(dest_mark->beg), dest_mark->end - dest_mark->beg, FALSE,
md_mark_get_ptr(ctx, title_mark - ctx->marks), title_mark->prev));
/* link/image closer may span multiple lines. */
if(mark->ch == ']') {
while(mark->end > line->end)
line++;
}
break;
}
case '<':
case '>': /* Autolink or raw HTML. */
if(!(mark->flags & MD_MARK_AUTOLINK)) {
/* Raw HTML. */
if(mark->flags & MD_MARK_OPENER)
text_type = MD_TEXT_HTML;
else
text_type = MD_TEXT_NORMAL;
break;
}
/* Pass through, if auto-link. */
case '@': /* Permissive e-mail autolink. */
case ':': /* Permissive URL autolink. */
case '.': /* Permissive WWW autolink. */
{
MD_MARK* opener = ((mark->flags & MD_MARK_OPENER) ? mark : &ctx->marks[mark->prev]);
MD_MARK* closer = &ctx->marks[opener->next];
const CHAR* dest = STR(opener->end);
SZ dest_size = closer->beg - opener->end;
/* For permissive auto-links we do not know closer mark
* position at the time of md_collect_marks(), therefore
* it can be out-of-order in ctx->marks[].
*
* With this flag, we make sure that we output the closer
* only if we processed the opener. */
if(mark->flags & MD_MARK_OPENER)
closer->flags |= MD_MARK_VALIDPERMISSIVEAUTOLINK;
if(opener->ch == '@' || opener->ch == '.') {
dest_size += 7;
MD_TEMP_BUFFER(dest_size * sizeof(CHAR));
memcpy(ctx->buffer,
(opener->ch == '@' ? _T("mailto:") : _T("http://")),
7 * sizeof(CHAR));
memcpy(ctx->buffer + 7, dest, (dest_size-7) * sizeof(CHAR));
dest = ctx->buffer;
}
if(closer->flags & MD_MARK_VALIDPERMISSIVEAUTOLINK)
MD_CHECK(md_enter_leave_span_a(ctx, (mark->flags & MD_MARK_OPENER),
MD_SPAN_A, dest, dest_size, TRUE, NULL, 0));
break;
}
case '&': /* Entity. */
MD_TEXT(MD_TEXT_ENTITY, STR(mark->beg), mark->end - mark->beg);
break;
case '\0':
MD_TEXT(MD_TEXT_NULLCHAR, _T(""), 1);
break;
case 127:
goto abort;
}
off = mark->end;
/* Move to next resolved mark. */
prev_mark = mark;
mark++;
while(!(mark->flags & MD_MARK_RESOLVED) || mark->beg < off)
mark++;
}
/* If reached end of line, move to next one. */
if(off >= line->end) {
/* If it is the last line, we are done. */
if(off >= end)
break;
if(text_type == MD_TEXT_CODE || text_type == MD_TEXT_LATEXMATH) {
OFF tmp;
MD_ASSERT(prev_mark != NULL);
MD_ASSERT(ISANYOF2_(prev_mark->ch, '`', '$') && (prev_mark->flags & MD_MARK_OPENER));
MD_ASSERT(ISANYOF2_(mark->ch, '`', '$') && (mark->flags & MD_MARK_CLOSER));
/* Inside a code span, trailing line whitespace has to be
* outputted. */
tmp = off;
while(off < ctx->size && ISBLANK(off))
off++;
if(off > tmp)
MD_TEXT(text_type, STR(tmp), off-tmp);
/* and new lines are transformed into single spaces. */
if(prev_mark->end < off && off < mark->beg)
MD_TEXT(text_type, _T(" "), 1);
} else if(text_type == MD_TEXT_HTML) {
/* Inside raw HTML, we output the new line verbatim, including
* any trailing spaces. */
OFF tmp = off;
while(tmp < end && ISBLANK(tmp))
tmp++;
if(tmp > off)
MD_TEXT(MD_TEXT_HTML, STR(off), tmp - off);
MD_TEXT(MD_TEXT_HTML, _T("\n"), 1);
} else {
/* Output soft or hard line break. */
MD_TEXTTYPE break_type = MD_TEXT_SOFTBR;
if(text_type == MD_TEXT_NORMAL) {
if(enforce_hardbreak)
break_type = MD_TEXT_BR;
else if((CH(line->end) == _T(' ') && CH(line->end+1) == _T(' ')))
break_type = MD_TEXT_BR;
}
MD_TEXT(break_type, _T("\n"), 1);
}
/* Move to the next line. */
line++;
off = line->beg;
enforce_hardbreak = 0;
}
}
abort:
return ret;
}
/***************************
*** Processing Tables ***
***************************/
static void
md_analyze_table_alignment(MD_CTX* ctx, OFF beg, OFF end, MD_ALIGN* align, int n_align)
{
static const MD_ALIGN align_map[] = { MD_ALIGN_DEFAULT, MD_ALIGN_LEFT, MD_ALIGN_RIGHT, MD_ALIGN_CENTER };
OFF off = beg;
while(n_align > 0) {
int index = 0; /* index into align_map[] */
while(CH(off) != _T('-'))
off++;
if(off > beg && CH(off-1) == _T(':'))
index |= 1;
while(off < end && CH(off) == _T('-'))
off++;
if(off < end && CH(off) == _T(':'))
index |= 2;
*align = align_map[index];
align++;
n_align--;
}
}
/* Forward declaration. */
static int md_process_normal_block_contents(MD_CTX* ctx, const MD_LINE* lines, int n_lines);
static int
md_process_table_cell(MD_CTX* ctx, MD_BLOCKTYPE cell_type, MD_ALIGN align, OFF beg, OFF end)
{
MD_LINE line;
MD_BLOCK_TD_DETAIL det;
int ret = 0;
while(beg < end && ISWHITESPACE(beg))
beg++;
while(end > beg && ISWHITESPACE(end-1))
end--;
det.align = align;
line.beg = beg;
line.end = end;
MD_ENTER_BLOCK(cell_type, &det);
MD_CHECK(md_process_normal_block_contents(ctx, &line, 1));
MD_LEAVE_BLOCK(cell_type, &det);
abort:
return ret;
}
static int
md_process_table_row(MD_CTX* ctx, MD_BLOCKTYPE cell_type, OFF beg, OFF end,
const MD_ALIGN* align, int col_count)
{
MD_LINE line;
OFF* pipe_offs = NULL;
int i, j, k, n;
int ret = 0;
line.beg = beg;
line.end = end;
/* Break the line into table cells by identifying pipe characters who
* form the cell boundary. */
MD_CHECK(md_analyze_inlines(ctx, &line, 1, TRUE));
/* We have to remember the cell boundaries in local buffer because
* ctx->marks[] shall be reused during cell contents processing. */
n = ctx->n_table_cell_boundaries + 2;
pipe_offs = (OFF*) malloc(n * sizeof(OFF));
if(pipe_offs == NULL) {
MD_LOG("malloc() failed.");
ret = -1;
goto abort;
}
j = 0;
pipe_offs[j++] = beg;
for(i = TABLECELLBOUNDARIES.head; i >= 0; i = ctx->marks[i].next) {
MD_MARK* mark = &ctx->marks[i];
pipe_offs[j++] = mark->end;
}
pipe_offs[j++] = end+1;
/* Process cells. */
MD_ENTER_BLOCK(MD_BLOCK_TR, NULL);
k = 0;
for(i = 0; i < j-1 && k < col_count; i++) {
if(pipe_offs[i] < pipe_offs[i+1]-1)
MD_CHECK(md_process_table_cell(ctx, cell_type, align[k++], pipe_offs[i], pipe_offs[i+1]-1));
}
/* Make sure we call enough table cells even if the current table contains
* too few of them. */
while(k < col_count)
MD_CHECK(md_process_table_cell(ctx, cell_type, align[k++], 0, 0));
MD_LEAVE_BLOCK(MD_BLOCK_TR, NULL);
abort:
free(pipe_offs);
/* Free any temporary memory blocks stored within some dummy marks. */
for(i = PTR_CHAIN.head; i >= 0; i = ctx->marks[i].next)
free(md_mark_get_ptr(ctx, i));
PTR_CHAIN.head = -1;
PTR_CHAIN.tail = -1;
return ret;
}
static int
md_process_table_block_contents(MD_CTX* ctx, int col_count, const MD_LINE* lines, int n_lines)
{
MD_ALIGN* align;
int i;
int ret = 0;
/* At least two lines have to be present: The column headers and the line
* with the underlines. */
MD_ASSERT(n_lines >= 2);
align = malloc(col_count * sizeof(MD_ALIGN));
if(align == NULL) {
MD_LOG("malloc() failed.");
ret = -1;
goto abort;
}
md_analyze_table_alignment(ctx, lines[1].beg, lines[1].end, align, col_count);
MD_ENTER_BLOCK(MD_BLOCK_THEAD, NULL);
MD_CHECK(md_process_table_row(ctx, MD_BLOCK_TH,
lines[0].beg, lines[0].end, align, col_count));
MD_LEAVE_BLOCK(MD_BLOCK_THEAD, NULL);
MD_ENTER_BLOCK(MD_BLOCK_TBODY, NULL);
for(i = 2; i < n_lines; i++) {
MD_CHECK(md_process_table_row(ctx, MD_BLOCK_TD,
lines[i].beg, lines[i].end, align, col_count));
}
MD_LEAVE_BLOCK(MD_BLOCK_TBODY, NULL);
abort:
free(align);
return ret;
}
/**************************
*** Processing Block ***
**************************/
#define MD_BLOCK_CONTAINER_OPENER 0x01
#define MD_BLOCK_CONTAINER_CLOSER 0x02
#define MD_BLOCK_CONTAINER (MD_BLOCK_CONTAINER_OPENER | MD_BLOCK_CONTAINER_CLOSER)
#define MD_BLOCK_LOOSE_LIST 0x04
#define MD_BLOCK_SETEXT_HEADER 0x08
struct MD_BLOCK_tag {
MD_BLOCKTYPE type : 8;
unsigned flags : 8;
/* MD_BLOCK_H: Header level (1 - 6)
* MD_BLOCK_CODE: Non-zero if fenced, zero if indented.
* MD_BLOCK_LI: Task mark character (0 if not task list item, 'x', 'X' or ' ').
* MD_BLOCK_TABLE: Column count (as determined by the table underline).
*/
unsigned data : 16;
/* Leaf blocks: Count of lines (MD_LINE or MD_VERBATIMLINE) on the block.
* MD_BLOCK_LI: Task mark offset in the input doc.
* MD_BLOCK_OL: Start item number.
*/
unsigned n_lines;
};
struct MD_CONTAINER_tag {
CHAR ch;
unsigned is_loose : 8;
unsigned is_task : 8;
unsigned start;
unsigned mark_indent;
unsigned contents_indent;
OFF block_byte_off;
OFF task_mark_off;
};
static int
md_process_normal_block_contents(MD_CTX* ctx, const MD_LINE* lines, int n_lines)
{
int i;
int ret;
MD_CHECK(md_analyze_inlines(ctx, lines, n_lines, FALSE));
MD_CHECK(md_process_inlines(ctx, lines, n_lines));
abort:
/* Free any temporary memory blocks stored within some dummy marks. */
for(i = PTR_CHAIN.head; i >= 0; i = ctx->marks[i].next)
free(md_mark_get_ptr(ctx, i));
PTR_CHAIN.head = -1;
PTR_CHAIN.tail = -1;
return ret;
}
static int
md_process_verbatim_block_contents(MD_CTX* ctx, MD_TEXTTYPE text_type, const MD_VERBATIMLINE* lines, int n_lines)
{
static const CHAR indent_chunk_str[] = _T(" ");
static const SZ indent_chunk_size = SIZEOF_ARRAY(indent_chunk_str) - 1;
int i;
int ret = 0;
for(i = 0; i < n_lines; i++) {
const MD_VERBATIMLINE* line = &lines[i];
int indent = line->indent;
MD_ASSERT(indent >= 0);
/* Output code indentation. */
while(indent > (int) indent_chunk_size) {
MD_TEXT(text_type, indent_chunk_str, indent_chunk_size);
indent -= indent_chunk_size;
}
if(indent > 0)
MD_TEXT(text_type, indent_chunk_str, indent);
/* Output the code line itself. */
MD_TEXT_INSECURE(text_type, STR(line->beg), line->end - line->beg);
/* Enforce end-of-line. */
MD_TEXT(text_type, _T("\n"), 1);
}
abort:
return ret;
}
static int
md_process_code_block_contents(MD_CTX* ctx, int is_fenced, const MD_VERBATIMLINE* lines, int n_lines)
{
if(is_fenced) {
/* Skip the first line in case of fenced code: It is the fence.
* (Only the starting fence is present due to logic in md_analyze_line().) */
lines++;
n_lines--;
} else {
/* Ignore blank lines at start/end of indented code block. */
while(n_lines > 0 && lines[0].beg == lines[0].end) {
lines++;
n_lines--;
}
while(n_lines > 0 && lines[n_lines-1].beg == lines[n_lines-1].end) {
n_lines--;
}
}
if(n_lines == 0)
return 0;
return md_process_verbatim_block_contents(ctx, MD_TEXT_CODE, lines, n_lines);
}
static int
md_setup_fenced_code_detail(MD_CTX* ctx, const MD_BLOCK* block, MD_BLOCK_CODE_DETAIL* det,
MD_ATTRIBUTE_BUILD* info_build, MD_ATTRIBUTE_BUILD* lang_build)
{
const MD_VERBATIMLINE* fence_line = (const MD_VERBATIMLINE*)(block + 1);
OFF beg = fence_line->beg;
OFF end = fence_line->end;
OFF lang_end;
CHAR fence_ch = CH(fence_line->beg);
int ret = 0;
/* Skip the fence itself. */
while(beg < ctx->size && CH(beg) == fence_ch)
beg++;
/* Trim initial spaces. */
while(beg < ctx->size && CH(beg) == _T(' '))
beg++;
/* Trim trailing spaces. */
while(end > beg && CH(end-1) == _T(' '))
end--;
/* Build info string attribute. */
MD_CHECK(md_build_attribute(ctx, STR(beg), end - beg, 0, &det->info, info_build));
/* Build info string attribute. */
lang_end = beg;
while(lang_end < end && !ISWHITESPACE(lang_end))
lang_end++;
MD_CHECK(md_build_attribute(ctx, STR(beg), lang_end - beg, 0, &det->lang, lang_build));
det->fence_char = fence_ch;
abort:
return ret;
}
static int
md_process_leaf_block(MD_CTX* ctx, const MD_BLOCK* block)
{
union {
MD_BLOCK_H_DETAIL header;
MD_BLOCK_CODE_DETAIL code;
} det;
MD_ATTRIBUTE_BUILD info_build;
MD_ATTRIBUTE_BUILD lang_build;
int is_in_tight_list;
int clean_fence_code_detail = FALSE;
int ret = 0;
memset(&det, 0, sizeof(det));
if(ctx->n_containers == 0)
is_in_tight_list = FALSE;
else
is_in_tight_list = !ctx->containers[ctx->n_containers-1].is_loose;
switch(block->type) {
case MD_BLOCK_H:
det.header.level = block->data;
break;
case MD_BLOCK_CODE:
/* For fenced code block, we may need to set the info string. */
if(block->data != 0) {
memset(&det.code, 0, sizeof(MD_BLOCK_CODE_DETAIL));
clean_fence_code_detail = TRUE;
MD_CHECK(md_setup_fenced_code_detail(ctx, block, &det.code, &info_build, &lang_build));
}
break;
default:
/* Noop. */
break;
}
if(!is_in_tight_list || block->type != MD_BLOCK_P)
MD_ENTER_BLOCK(block->type, (void*) &det);
/* Process the block contents accordingly to is type. */
switch(block->type) {
case MD_BLOCK_HR:
/* noop */
break;
case MD_BLOCK_CODE:
MD_CHECK(md_process_code_block_contents(ctx, (block->data != 0),
(const MD_VERBATIMLINE*)(block + 1), block->n_lines));
break;
case MD_BLOCK_HTML:
MD_CHECK(md_process_verbatim_block_contents(ctx, MD_TEXT_HTML,
(const MD_VERBATIMLINE*)(block + 1), block->n_lines));
break;
case MD_BLOCK_TABLE:
MD_CHECK(md_process_table_block_contents(ctx, block->data,
(const MD_LINE*)(block + 1), block->n_lines));
break;
default:
MD_CHECK(md_process_normal_block_contents(ctx,
(const MD_LINE*)(block + 1), block->n_lines));
break;
}
if(!is_in_tight_list || block->type != MD_BLOCK_P)
MD_LEAVE_BLOCK(block->type, (void*) &det);
abort:
if(clean_fence_code_detail) {
md_free_attribute(ctx, &info_build);
md_free_attribute(ctx, &lang_build);
}
return ret;
}
static int
md_process_all_blocks(MD_CTX* ctx)
{
int byte_off = 0;
int ret = 0;
/* ctx->containers now is not needed for detection of lists and list items
* so we reuse it for tracking what lists are loose or tight. We rely
* on the fact the vector is large enough to hold the deepest nesting
* level of lists. */
ctx->n_containers = 0;
while(byte_off < ctx->n_block_bytes) {
MD_BLOCK* block = (MD_BLOCK*)((char*)ctx->block_bytes + byte_off);
union {
MD_BLOCK_UL_DETAIL ul;
MD_BLOCK_OL_DETAIL ol;
MD_BLOCK_LI_DETAIL li;
} det;
switch(block->type) {
case MD_BLOCK_UL:
det.ul.is_tight = (block->flags & MD_BLOCK_LOOSE_LIST) ? FALSE : TRUE;
det.ul.mark = (CHAR) block->data;
break;
case MD_BLOCK_OL:
det.ol.start = block->n_lines;
det.ol.is_tight = (block->flags & MD_BLOCK_LOOSE_LIST) ? FALSE : TRUE;
det.ol.mark_delimiter = (CHAR) block->data;
break;
case MD_BLOCK_LI:
det.li.is_task = (block->data != 0);
det.li.task_mark = (CHAR) block->data;
det.li.task_mark_offset = (OFF) block->n_lines;
break;
default:
/* noop */
break;
}
if(block->flags & MD_BLOCK_CONTAINER) {
if(block->flags & MD_BLOCK_CONTAINER_CLOSER) {
MD_LEAVE_BLOCK(block->type, &det);
if(block->type == MD_BLOCK_UL || block->type == MD_BLOCK_OL || block->type == MD_BLOCK_QUOTE)
ctx->n_containers--;
}
if(block->flags & MD_BLOCK_CONTAINER_OPENER) {
MD_ENTER_BLOCK(block->type, &det);
if(block->type == MD_BLOCK_UL || block->type == MD_BLOCK_OL) {
ctx->containers[ctx->n_containers].is_loose = (block->flags & MD_BLOCK_LOOSE_LIST);
ctx->n_containers++;
} else if(block->type == MD_BLOCK_QUOTE) {
/* This causes that any text in a block quote, even if
* nested inside a tight list item, is wrapped with
* <p>...</p>. */
ctx->containers[ctx->n_containers].is_loose = TRUE;
ctx->n_containers++;
}
}
} else {
MD_CHECK(md_process_leaf_block(ctx, block));
if(block->type == MD_BLOCK_CODE || block->type == MD_BLOCK_HTML)
byte_off += block->n_lines * sizeof(MD_VERBATIMLINE);
else
byte_off += block->n_lines * sizeof(MD_LINE);
}
byte_off += sizeof(MD_BLOCK);
}
ctx->n_block_bytes = 0;
abort:
return ret;
}
/************************************
*** Grouping Lines into Blocks ***
************************************/
static void*
md_push_block_bytes(MD_CTX* ctx, int n_bytes)
{
void* ptr;
if(ctx->n_block_bytes + n_bytes > ctx->alloc_block_bytes) {
void* new_block_bytes;
ctx->alloc_block_bytes = (ctx->alloc_block_bytes > 0
? ctx->alloc_block_bytes + ctx->alloc_block_bytes / 2
: 512);
new_block_bytes = realloc(ctx->block_bytes, ctx->alloc_block_bytes);
if(new_block_bytes == NULL) {
MD_LOG("realloc() failed.");
return NULL;
}
/* Fix the ->current_block after the reallocation. */
if(ctx->current_block != NULL) {
OFF off_current_block = (char*) ctx->current_block - (char*) ctx->block_bytes;
ctx->current_block = (MD_BLOCK*) ((char*) new_block_bytes + off_current_block);
}
ctx->block_bytes = new_block_bytes;
}
ptr = (char*)ctx->block_bytes + ctx->n_block_bytes;
ctx->n_block_bytes += n_bytes;
return ptr;
}
static int
md_start_new_block(MD_CTX* ctx, const MD_LINE_ANALYSIS* line)
{
MD_BLOCK* block;
MD_ASSERT(ctx->current_block == NULL);
block = (MD_BLOCK*) md_push_block_bytes(ctx, sizeof(MD_BLOCK));
if(block == NULL)
return -1;
switch(line->type) {
case MD_LINE_HR:
block->type = MD_BLOCK_HR;
break;
case MD_LINE_ATXHEADER:
case MD_LINE_SETEXTHEADER:
block->type = MD_BLOCK_H;
break;
case MD_LINE_FENCEDCODE:
case MD_LINE_INDENTEDCODE:
block->type = MD_BLOCK_CODE;
break;
case MD_LINE_TEXT:
block->type = MD_BLOCK_P;
break;
case MD_LINE_HTML:
block->type = MD_BLOCK_HTML;
break;
case MD_LINE_BLANK:
case MD_LINE_SETEXTUNDERLINE:
case MD_LINE_TABLEUNDERLINE:
default:
MD_UNREACHABLE();
break;
}
block->flags = 0;
block->data = line->data;
block->n_lines = 0;
ctx->current_block = block;
return 0;
}
/* Eat from start of current (textual) block any reference definitions and
* remember them so we can resolve any links referring to them.
*
* (Reference definitions can only be at start of it as they cannot break
* a paragraph.)
*/
static int
md_consume_link_reference_definitions(MD_CTX* ctx)
{
MD_LINE* lines = (MD_LINE*) (ctx->current_block + 1);
int n_lines = ctx->current_block->n_lines;
int n = 0;
/* Compute how many lines at the start of the block form one or more
* reference definitions. */
while(n < n_lines) {
int n_link_ref_lines;
n_link_ref_lines = md_is_link_reference_definition(ctx,
lines + n, n_lines - n);
/* Not a reference definition? */
if(n_link_ref_lines == 0)
break;
/* We fail if it is the ref. def. but it could not be stored due
* a memory allocation error. */
if(n_link_ref_lines < 0)
return -1;
n += n_link_ref_lines;
}
/* If there was at least one reference definition, we need to remove
* its lines from the block, or perhaps even the whole block. */
if(n > 0) {
if(n == n_lines) {
/* Remove complete block. */
ctx->n_block_bytes -= n * sizeof(MD_LINE);
ctx->n_block_bytes -= sizeof(MD_BLOCK);
ctx->current_block = NULL;
} else {
/* Remove just some initial lines from the block. */
memmove(lines, lines + n, (n_lines - n) * sizeof(MD_LINE));
ctx->current_block->n_lines -= n;
ctx->n_block_bytes -= n * sizeof(MD_LINE);
}
}
return 0;
}
static int
md_end_current_block(MD_CTX* ctx)
{
int ret = 0;
if(ctx->current_block == NULL)
return ret;
/* Check whether there is a reference definition. (We do this here instead
* of in md_analyze_line() because reference definition can take multiple
* lines.) */
if(ctx->current_block->type == MD_BLOCK_P ||
(ctx->current_block->type == MD_BLOCK_H && (ctx->current_block->flags & MD_BLOCK_SETEXT_HEADER)))
{
MD_LINE* lines = (MD_LINE*) (ctx->current_block + 1);
if(CH(lines[0].beg) == _T('[')) {
MD_CHECK(md_consume_link_reference_definitions(ctx));
if(ctx->current_block == NULL)
return ret;
}
}
if(ctx->current_block->type == MD_BLOCK_H && (ctx->current_block->flags & MD_BLOCK_SETEXT_HEADER)) {
int n_lines = ctx->current_block->n_lines;
if(n_lines > 1) {
/* Get rid of the underline. */
ctx->current_block->n_lines--;
ctx->n_block_bytes -= sizeof(MD_LINE);
} else {
/* Only the underline has left after eating the ref. defs.
* Keep the line as beginning of a new ordinary paragraph. */
ctx->current_block->type = MD_BLOCK_P;
return 0;
}
}
/* Mark we are not building any block anymore. */
ctx->current_block = NULL;
abort:
return ret;
}
static int
md_add_line_into_current_block(MD_CTX* ctx, const MD_LINE_ANALYSIS* analysis)
{
MD_ASSERT(ctx->current_block != NULL);
if(ctx->current_block->type == MD_BLOCK_CODE || ctx->current_block->type == MD_BLOCK_HTML) {
MD_VERBATIMLINE* line;
line = (MD_VERBATIMLINE*) md_push_block_bytes(ctx, sizeof(MD_VERBATIMLINE));
if(line == NULL)
return -1;
line->indent = analysis->indent;
line->beg = analysis->beg;
line->end = analysis->end;
} else {
MD_LINE* line;
line = (MD_LINE*) md_push_block_bytes(ctx, sizeof(MD_LINE));
if(line == NULL)
return -1;
line->beg = analysis->beg;
line->end = analysis->end;
}
ctx->current_block->n_lines++;
return 0;
}
static int
md_push_container_bytes(MD_CTX* ctx, MD_BLOCKTYPE type, unsigned start,
unsigned data, unsigned flags)
{
MD_BLOCK* block;
int ret = 0;
MD_CHECK(md_end_current_block(ctx));
block = (MD_BLOCK*) md_push_block_bytes(ctx, sizeof(MD_BLOCK));
if(block == NULL)
return -1;
block->type = type;
block->flags = flags;
block->data = data;
block->n_lines = start;
abort:
return ret;
}
/***********************
*** Line Analysis ***
***********************/
static int
md_is_hr_line(MD_CTX* ctx, OFF beg, OFF* p_end, OFF* p_killer)
{
OFF off = beg + 1;
int n = 1;
while(off < ctx->size && (CH(off) == CH(beg) || CH(off) == _T(' ') || CH(off) == _T('\t'))) {
if(CH(off) == CH(beg))
n++;
off++;
}
if(n < 3) {
*p_killer = off;
return FALSE;
}
/* Nothing else can be present on the line. */
if(off < ctx->size && !ISNEWLINE(off)) {
*p_killer = off;
return FALSE;
}
*p_end = off;
return TRUE;
}
static int
md_is_atxheader_line(MD_CTX* ctx, OFF beg, OFF* p_beg, OFF* p_end, unsigned* p_level)
{
int n;
OFF off = beg + 1;
while(off < ctx->size && CH(off) == _T('#') && off - beg < 7)
off++;
n = off - beg;
if(n > 6)
return FALSE;
*p_level = n;
if(!(ctx->parser.flags & MD_FLAG_PERMISSIVEATXHEADERS) && off < ctx->size &&
CH(off) != _T(' ') && CH(off) != _T('\t') && !ISNEWLINE(off))
return FALSE;
while(off < ctx->size && CH(off) == _T(' '))
off++;
*p_beg = off;
*p_end = off;
return TRUE;
}
static int
md_is_setext_underline(MD_CTX* ctx, OFF beg, OFF* p_end, unsigned* p_level)
{
OFF off = beg + 1;
while(off < ctx->size && CH(off) == CH(beg))
off++;
/* Optionally, space(s) can follow. */
while(off < ctx->size && CH(off) == _T(' '))
off++;
/* But nothing more is allowed on the line. */
if(off < ctx->size && !ISNEWLINE(off))
return FALSE;
*p_level = (CH(beg) == _T('=') ? 1 : 2);
*p_end = off;
return TRUE;
}
static int
md_is_table_underline(MD_CTX* ctx, OFF beg, OFF* p_end, unsigned* p_col_count)
{
OFF off = beg;
int found_pipe = FALSE;
unsigned col_count = 0;
if(off < ctx->size && CH(off) == _T('|')) {
found_pipe = TRUE;
off++;
while(off < ctx->size && ISWHITESPACE(off))
off++;
}
while(1) {
OFF cell_beg;
int delimited = FALSE;
/* Cell underline ("-----", ":----", "----:" or ":----:") */
cell_beg = off;
if(off < ctx->size && CH(off) == _T(':'))
off++;
while(off < ctx->size && CH(off) == _T('-'))
off++;
if(off < ctx->size && CH(off) == _T(':'))
off++;
if(off - cell_beg < 3)
return FALSE;
col_count++;
/* Pipe delimiter (optional at the end of line). */
while(off < ctx->size && ISWHITESPACE(off))
off++;
if(off < ctx->size && CH(off) == _T('|')) {
delimited = TRUE;
found_pipe = TRUE;
off++;
while(off < ctx->size && ISWHITESPACE(off))
off++;
}
/* Success, if we reach end of line. */
if(off >= ctx->size || ISNEWLINE(off))
break;
if(!delimited)
return FALSE;
}
if(!found_pipe)
return FALSE;
*p_end = off;
*p_col_count = col_count;
return TRUE;
}
static int
md_is_opening_code_fence(MD_CTX* ctx, OFF beg, OFF* p_end)
{
OFF off = beg;
while(off < ctx->size && CH(off) == CH(beg))
off++;
/* Fence must have at least three characters. */
if(off - beg < 3)
return FALSE;
ctx->code_fence_length = off - beg;
/* Optionally, space(s) can follow. */
while(off < ctx->size && CH(off) == _T(' '))
off++;
/* Optionally, an info string can follow. */
while(off < ctx->size && !ISNEWLINE(off)) {
/* Backtick-based fence must not contain '`' in the info string. */
if(CH(beg) == _T('`') && CH(off) == _T('`'))
return FALSE;
off++;
}
*p_end = off;
return TRUE;
}
static int
md_is_closing_code_fence(MD_CTX* ctx, CHAR ch, OFF beg, OFF* p_end)
{
OFF off = beg;
int ret = FALSE;
/* Closing fence must have at least the same length and use same char as
* opening one. */
while(off < ctx->size && CH(off) == ch)
off++;
if(off - beg < ctx->code_fence_length)
goto out;
/* Optionally, space(s) can follow */
while(off < ctx->size && CH(off) == _T(' '))
off++;
/* But nothing more is allowed on the line. */
if(off < ctx->size && !ISNEWLINE(off))
goto out;
ret = TRUE;
out:
/* Note we set *p_end even on failure: If we are not closing fence, caller
* would eat the line anyway without any parsing. */
*p_end = off;
return ret;
}
/* Returns type of the raw HTML block, or FALSE if it is not HTML block.
* (Refer to CommonMark specification for details about the types.)
*/
static int
md_is_html_block_start_condition(MD_CTX* ctx, OFF beg)
{
typedef struct TAG_tag TAG;
struct TAG_tag {
const CHAR* name;
unsigned len : 8;
};
/* Type 6 is started by a long list of allowed tags. We use two-level
* tree to speed-up the search. */
#ifdef X
#undef X
#endif
#define X(name) { _T(name), (sizeof(name)-1) / sizeof(CHAR) }
#define Xend { NULL, 0 }
static const TAG t1[] = { X("script"), X("pre"), X("style"), Xend };
static const TAG a6[] = { X("address"), X("article"), X("aside"), Xend };
static const TAG b6[] = { X("base"), X("basefont"), X("blockquote"), X("body"), Xend };
static const TAG c6[] = { X("caption"), X("center"), X("col"), X("colgroup"), Xend };
static const TAG d6[] = { X("dd"), X("details"), X("dialog"), X("dir"),
X("div"), X("dl"), X("dt"), Xend };
static const TAG f6[] = { X("fieldset"), X("figcaption"), X("figure"), X("footer"),
X("form"), X("frame"), X("frameset"), Xend };
static const TAG h6[] = { X("h1"), X("head"), X("header"), X("hr"), X("html"), Xend };
static const TAG i6[] = { X("iframe"), Xend };
static const TAG l6[] = { X("legend"), X("li"), X("link"), Xend };
static const TAG m6[] = { X("main"), X("menu"), X("menuitem"), Xend };
static const TAG n6[] = { X("nav"), X("noframes"), Xend };
static const TAG o6[] = { X("ol"), X("optgroup"), X("option"), Xend };
static const TAG p6[] = { X("p"), X("param"), Xend };
static const TAG s6[] = { X("section"), X("source"), X("summary"), Xend };
static const TAG t6[] = { X("table"), X("tbody"), X("td"), X("tfoot"), X("th"),
X("thead"), X("title"), X("tr"), X("track"), Xend };
static const TAG u6[] = { X("ul"), Xend };
static const TAG xx[] = { Xend };
#undef X
static const TAG* map6[26] = {
a6, b6, c6, d6, xx, f6, xx, h6, i6, xx, xx, l6, m6,
n6, o6, p6, xx, xx, s6, t6, u6, xx, xx, xx, xx, xx
};
OFF off = beg + 1;
int i;
/* Check for type 1: <script, <pre, or <style */
for(i = 0; t1[i].name != NULL; i++) {
if(off + t1[i].len <= ctx->size) {
if(md_ascii_case_eq(STR(off), t1[i].name, t1[i].len))
return 1;
}
}
/* Check for type 2: <!-- */
if(off + 3 < ctx->size && CH(off) == _T('!') && CH(off+1) == _T('-') && CH(off+2) == _T('-'))
return 2;
/* Check for type 3: <? */
if(off < ctx->size && CH(off) == _T('?'))
return 3;
/* Check for type 4 or 5: <! */
if(off < ctx->size && CH(off) == _T('!')) {
/* Check for type 4: <! followed by uppercase letter. */
if(off + 1 < ctx->size && ISUPPER(off+1))
return 4;
/* Check for type 5: <![CDATA[ */
if(off + 8 < ctx->size) {
if(md_ascii_eq(STR(off), _T("![CDATA["), 8))
return 5;
}
}
/* Check for type 6: Many possible starting tags listed above. */
if(off + 1 < ctx->size && (ISALPHA(off) || (CH(off) == _T('/') && ISALPHA(off+1)))) {
int slot;
const TAG* tags;
if(CH(off) == _T('/'))
off++;
slot = (ISUPPER(off) ? CH(off) - 'A' : CH(off) - 'a');
tags = map6[slot];
for(i = 0; tags[i].name != NULL; i++) {
if(off + tags[i].len <= ctx->size) {
if(md_ascii_case_eq(STR(off), tags[i].name, tags[i].len)) {
OFF tmp = off + tags[i].len;
if(tmp >= ctx->size)
return 6;
if(ISBLANK(tmp) || ISNEWLINE(tmp) || CH(tmp) == _T('>'))
return 6;
if(tmp+1 < ctx->size && CH(tmp) == _T('/') && CH(tmp+1) == _T('>'))
return 6;
break;
}
}
}
}
/* Check for type 7: any COMPLETE other opening or closing tag. */
if(off + 1 < ctx->size) {
OFF end;
if(md_is_html_tag(ctx, NULL, 0, beg, ctx->size, &end)) {
/* Only optional whitespace and new line may follow. */
while(end < ctx->size && ISWHITESPACE(end))
end++;
if(end >= ctx->size || ISNEWLINE(end))
return 7;
}
}
return FALSE;
}
/* Case sensitive check whether there is a substring 'what' between 'beg'
* and end of line. */
static int
md_line_contains(MD_CTX* ctx, OFF beg, const CHAR* what, SZ what_len, OFF* p_end)
{
OFF i;
for(i = beg; i + what_len < ctx->size; i++) {
if(ISNEWLINE(i))
break;
if(memcmp(STR(i), what, what_len * sizeof(CHAR)) == 0) {
*p_end = i + what_len;
return TRUE;
}
}
*p_end = i;
return FALSE;
}
/* Returns type of HTML block end condition or FALSE if not an end condition.
*
* Note it fills p_end even when it is not end condition as the caller
* does not need to analyze contents of a raw HTML block.
*/
static int
md_is_html_block_end_condition(MD_CTX* ctx, OFF beg, OFF* p_end)
{
switch(ctx->html_block_type) {
case 1:
{
OFF off = beg;
while(off < ctx->size && !ISNEWLINE(off)) {
if(CH(off) == _T('<')) {
if(md_ascii_case_eq(STR(off), _T("</script>"), 9)) {
*p_end = off + 9;
return TRUE;
}
if(md_ascii_case_eq(STR(off), _T("</style>"), 8)) {
*p_end = off + 8;
return TRUE;
}
if(md_ascii_case_eq(STR(off), _T("</pre>"), 6)) {
*p_end = off + 6;
return TRUE;
}
}
off++;
}
*p_end = off;
return FALSE;
}
case 2:
return (md_line_contains(ctx, beg, _T("-->"), 3, p_end) ? 2 : FALSE);
case 3:
return (md_line_contains(ctx, beg, _T("?>"), 2, p_end) ? 3 : FALSE);
case 4:
return (md_line_contains(ctx, beg, _T(">"), 1, p_end) ? 4 : FALSE);
case 5:
return (md_line_contains(ctx, beg, _T("]]>"), 3, p_end) ? 5 : FALSE);
case 6: /* Pass through */
case 7:
*p_end = beg;
return (ISNEWLINE(beg) ? ctx->html_block_type : FALSE);
default:
MD_UNREACHABLE();
}
return FALSE;
}
static int
md_is_container_compatible(const MD_CONTAINER* pivot, const MD_CONTAINER* container)
{
/* Block quote has no "items" like lists. */
if(container->ch == _T('>'))
return FALSE;
if(container->ch != pivot->ch)
return FALSE;
if(container->mark_indent > pivot->contents_indent)
return FALSE;
return TRUE;
}
static int
md_push_container(MD_CTX* ctx, const MD_CONTAINER* container)
{
if(ctx->n_containers >= ctx->alloc_containers) {
MD_CONTAINER* new_containers;
ctx->alloc_containers = (ctx->alloc_containers > 0
? ctx->alloc_containers + ctx->alloc_containers / 2
: 16);
new_containers = realloc(ctx->containers, ctx->alloc_containers * sizeof(MD_CONTAINER));
if(new_containers == NULL) {
MD_LOG("realloc() failed.");
return -1;
}
ctx->containers = new_containers;
}
memcpy(&ctx->containers[ctx->n_containers++], container, sizeof(MD_CONTAINER));
return 0;
}
static int
md_enter_child_containers(MD_CTX* ctx, int n_children, unsigned data)
{
int i;
int ret = 0;
for(i = ctx->n_containers - n_children; i < ctx->n_containers; i++) {
MD_CONTAINER* c = &ctx->containers[i];
int is_ordered_list = FALSE;
switch(c->ch) {
case _T(')'):
case _T('.'):
is_ordered_list = TRUE;
/* Pass through */
case _T('-'):
case _T('+'):
case _T('*'):
/* Remember offset in ctx->block_bytes so we can revisit the
* block if we detect it is a loose list. */
md_end_current_block(ctx);
c->block_byte_off = ctx->n_block_bytes;
MD_CHECK(md_push_container_bytes(ctx,
(is_ordered_list ? MD_BLOCK_OL : MD_BLOCK_UL),
c->start, data, MD_BLOCK_CONTAINER_OPENER));
MD_CHECK(md_push_container_bytes(ctx, MD_BLOCK_LI,
c->task_mark_off,
(c->is_task ? CH(c->task_mark_off) : 0),
MD_BLOCK_CONTAINER_OPENER));
break;
case _T('>'):
MD_CHECK(md_push_container_bytes(ctx, MD_BLOCK_QUOTE, 0, 0, MD_BLOCK_CONTAINER_OPENER));
break;
default:
MD_UNREACHABLE();
break;
}
}
abort:
return ret;
}
static int
md_leave_child_containers(MD_CTX* ctx, int n_keep)
{
int ret = 0;
while(ctx->n_containers > n_keep) {
MD_CONTAINER* c = &ctx->containers[ctx->n_containers-1];
int is_ordered_list = FALSE;
switch(c->ch) {
case _T(')'):
case _T('.'):
is_ordered_list = TRUE;
/* Pass through */
case _T('-'):
case _T('+'):
case _T('*'):
MD_CHECK(md_push_container_bytes(ctx, MD_BLOCK_LI,
c->task_mark_off, (c->is_task ? CH(c->task_mark_off) : 0),
MD_BLOCK_CONTAINER_CLOSER));
MD_CHECK(md_push_container_bytes(ctx,
(is_ordered_list ? MD_BLOCK_OL : MD_BLOCK_UL), 0,
c->ch, MD_BLOCK_CONTAINER_CLOSER));
break;
case _T('>'):
MD_CHECK(md_push_container_bytes(ctx, MD_BLOCK_QUOTE, 0,
0, MD_BLOCK_CONTAINER_CLOSER));
break;
default:
MD_UNREACHABLE();
break;
}
ctx->n_containers--;
}
abort:
return ret;
}
static int
md_is_container_mark(MD_CTX* ctx, unsigned indent, OFF beg, OFF* p_end, MD_CONTAINER* p_container)
{
OFF off = beg;
OFF max_end;
if(indent >= ctx->code_indent_offset)
return FALSE;
/* Check for block quote mark. */
if(off < ctx->size && CH(off) == _T('>')) {
off++;
p_container->ch = _T('>');
p_container->is_loose = FALSE;
p_container->is_task = FALSE;
p_container->mark_indent = indent;
p_container->contents_indent = indent + 1;
*p_end = off;
return TRUE;
}
/* Check for list item bullet mark. */
if(off+1 < ctx->size && ISANYOF(off, _T("-+*")) && (ISBLANK(off+1) || ISNEWLINE(off+1))) {
p_container->ch = CH(off);
p_container->is_loose = FALSE;
p_container->is_task = FALSE;
p_container->mark_indent = indent;
p_container->contents_indent = indent + 1;
*p_end = off + 1;
return TRUE;
}
/* Check for ordered list item marks. */
max_end = off + 9;
if(max_end > ctx->size)
max_end = ctx->size;
p_container->start = 0;
while(off < max_end && ISDIGIT(off)) {
p_container->start = p_container->start * 10 + CH(off) - _T('0');
off++;
}
if(off > beg && off+1 < ctx->size &&
(CH(off) == _T('.') || CH(off) == _T(')')) &&
(ISBLANK(off+1) || ISNEWLINE(off+1)))
{
p_container->ch = CH(off);
p_container->is_loose = FALSE;
p_container->is_task = FALSE;
p_container->mark_indent = indent;
p_container->contents_indent = indent + off - beg + 1;
*p_end = off + 1;
return TRUE;
}
return FALSE;
}
static unsigned
md_line_indentation(MD_CTX* ctx, unsigned total_indent, OFF beg, OFF* p_end)
{
OFF off = beg;
unsigned indent = total_indent;
while(off < ctx->size && ISBLANK(off)) {
if(CH(off) == _T('\t'))
indent = (indent + 4) & ~3;
else
indent++;
off++;
}
*p_end = off;
return indent - total_indent;
}
static const MD_LINE_ANALYSIS md_dummy_blank_line = { MD_LINE_BLANK, 0 };
/* Analyze type of the line and find some its properties. This serves as a
* main input for determining type and boundaries of a block. */
static int
md_analyze_line(MD_CTX* ctx, OFF beg, OFF* p_end,
const MD_LINE_ANALYSIS* pivot_line, MD_LINE_ANALYSIS* line)
{
unsigned total_indent = 0;
int n_parents = 0;
int n_brothers = 0;
int n_children = 0;
MD_CONTAINER container = { 0 };
int prev_line_has_list_loosening_effect = ctx->last_line_has_list_loosening_effect;
OFF off = beg;
OFF hr_killer = 0;
int ret = 0;
line->indent = md_line_indentation(ctx, total_indent, off, &off);
total_indent += line->indent;
line->beg = off;
/* Given the indentation and block quote marks '>', determine how many of
* the current containers are our parents. */
while(n_parents < ctx->n_containers) {
MD_CONTAINER* c = &ctx->containers[n_parents];
if(c->ch == _T('>') && line->indent < ctx->code_indent_offset &&
off < ctx->size && CH(off) == _T('>'))
{
/* Block quote mark. */
off++;
total_indent++;
line->indent = md_line_indentation(ctx, total_indent, off, &off);
total_indent += line->indent;
/* The optional 1st space after '>' is part of the block quote mark. */
if(line->indent > 0)
line->indent--;
line->beg = off;
} else if(c->ch != _T('>') && line->indent >= c->contents_indent) {
/* List. */
line->indent -= c->contents_indent;
} else {
break;
}
n_parents++;
}
if(off >= ctx->size || ISNEWLINE(off)) {
/* Blank line does not need any real indentation to be nested inside
* a list. */
if(n_brothers + n_children == 0) {
while(n_parents < ctx->n_containers && ctx->containers[n_parents].ch != _T('>'))
n_parents++;
}
}
while(TRUE) {
/* Check whether we are fenced code continuation. */
if(pivot_line->type == MD_LINE_FENCEDCODE) {
line->beg = off;
/* We are another MD_LINE_FENCEDCODE unless we are closing fence
* which we transform into MD_LINE_BLANK. */
if(line->indent < ctx->code_indent_offset) {
if(md_is_closing_code_fence(ctx, CH(pivot_line->beg), off, &off)) {
line->type = MD_LINE_BLANK;
ctx->last_line_has_list_loosening_effect = FALSE;
break;
}
}
/* Change indentation accordingly to the initial code fence. */
if(n_parents == ctx->n_containers) {
if(line->indent > pivot_line->indent)
line->indent -= pivot_line->indent;
else
line->indent = 0;
line->type = MD_LINE_FENCEDCODE;
break;
}
}
/* Check whether we are HTML block continuation. */
if(pivot_line->type == MD_LINE_HTML && ctx->html_block_type > 0) {
int html_block_type;
html_block_type = md_is_html_block_end_condition(ctx, off, &off);
if(html_block_type > 0) {
MD_ASSERT(html_block_type == ctx->html_block_type);
/* Make sure this is the last line of the block. */
ctx->html_block_type = 0;
/* Some end conditions serve as blank lines at the same time. */
if(html_block_type == 6 || html_block_type == 7) {
line->type = MD_LINE_BLANK;
line->indent = 0;
break;
}
}
if(n_parents == ctx->n_containers) {
line->type = MD_LINE_HTML;
break;
}
}
/* Check for blank line. */
if(off >= ctx->size || ISNEWLINE(off)) {
if(pivot_line->type == MD_LINE_INDENTEDCODE && n_parents == ctx->n_containers) {
line->type = MD_LINE_INDENTEDCODE;
if(line->indent > ctx->code_indent_offset)
line->indent -= ctx->code_indent_offset;
else
line->indent = 0;
ctx->last_line_has_list_loosening_effect = FALSE;
} else {
line->type = MD_LINE_BLANK;
ctx->last_line_has_list_loosening_effect = (n_parents > 0 &&
n_brothers + n_children == 0 &&
ctx->containers[n_parents-1].ch != _T('>'));
#if 1
/* See https://github.com/mity/md4c/issues/6
*
* This ugly checking tests we are in (yet empty) list item but not
* its very first line (with the list item mark).
*
* If we are such blank line, then any following non-blank line
* which would be part of this list item actually ends the list
* because "a list item can begin with at most one blank line."
*/
if(n_parents > 0 && ctx->containers[n_parents-1].ch != _T('>') &&
n_brothers + n_children == 0 && ctx->current_block == NULL &&
ctx->n_block_bytes > (int) sizeof(MD_BLOCK))
{
MD_BLOCK* top_block = (MD_BLOCK*) ((char*)ctx->block_bytes + ctx->n_block_bytes - sizeof(MD_BLOCK));
if(top_block->type == MD_BLOCK_LI)
ctx->last_list_item_starts_with_two_blank_lines = TRUE;
}
#endif
}
break;
} else {
#if 1
/* This is 2nd half of the hack. If the flag is set (that is there
* were 2nd blank line at the start of the list item) and we would also
* belonging to such list item, than interrupt the list. */
ctx->last_line_has_list_loosening_effect = FALSE;
if(ctx->last_list_item_starts_with_two_blank_lines) {
if(n_parents > 0 && ctx->containers[n_parents-1].ch != _T('>') &&
n_brothers + n_children == 0 && ctx->current_block == NULL &&
ctx->n_block_bytes > (int) sizeof(MD_BLOCK))
{
MD_BLOCK* top_block = (MD_BLOCK*) ((char*)ctx->block_bytes + ctx->n_block_bytes - sizeof(MD_BLOCK));
if(top_block->type == MD_BLOCK_LI)
n_parents--;
}
ctx->last_list_item_starts_with_two_blank_lines = FALSE;
}
#endif
}
/* Check whether we are Setext underline. */
if(line->indent < ctx->code_indent_offset && pivot_line->type == MD_LINE_TEXT
&& (CH(off) == _T('=') || CH(off) == _T('-'))
&& (n_parents == ctx->n_containers))
{
unsigned level;
if(md_is_setext_underline(ctx, off, &off, &level)) {
line->type = MD_LINE_SETEXTUNDERLINE;
line->data = level;
break;
}
}
/* Check for thematic break line. */
if(line->indent < ctx->code_indent_offset && ISANYOF(off, _T("-_*")) && off >= hr_killer) {
if(md_is_hr_line(ctx, off, &off, &hr_killer)) {
line->type = MD_LINE_HR;
break;
}
}
/* Check for "brother" container. I.e. whether we are another list item
* in already started list. */
if(n_parents < ctx->n_containers && n_brothers + n_children == 0) {
OFF tmp;
if(md_is_container_mark(ctx, line->indent, off, &tmp, &container) &&
md_is_container_compatible(&ctx->containers[n_parents], &container))
{
pivot_line = &md_dummy_blank_line;
off = tmp;
total_indent += container.contents_indent - container.mark_indent;
line->indent = md_line_indentation(ctx, total_indent, off, &off);
total_indent += line->indent;
line->beg = off;
/* Some of the following whitespace actually still belongs to the mark. */
if(off >= ctx->size || ISNEWLINE(off)) {
container.contents_indent++;
} else if(line->indent <= ctx->code_indent_offset) {
container.contents_indent += line->indent;
line->indent = 0;
} else {
container.contents_indent += 1;
line->indent--;
}
ctx->containers[n_parents].mark_indent = container.mark_indent;
ctx->containers[n_parents].contents_indent = container.contents_indent;
n_brothers++;
continue;
}
}
/* Check for indented code.
* Note indented code block cannot interrupt a paragraph. */
if(line->indent >= ctx->code_indent_offset &&
(pivot_line->type == MD_LINE_BLANK || pivot_line->type == MD_LINE_INDENTEDCODE))
{
line->type = MD_LINE_INDENTEDCODE;
MD_ASSERT(line->indent >= ctx->code_indent_offset);
line->indent -= ctx->code_indent_offset;
line->data = 0;
break;
}
/* Check for start of a new container block. */
if(line->indent < ctx->code_indent_offset &&
md_is_container_mark(ctx, line->indent, off, &off, &container))
{
if(pivot_line->type == MD_LINE_TEXT && n_parents == ctx->n_containers &&
(off >= ctx->size || ISNEWLINE(off)) && container.ch != _T('>'))
{
/* Noop. List mark followed by a blank line cannot interrupt a paragraph. */
} else if(pivot_line->type == MD_LINE_TEXT && n_parents == ctx->n_containers &&
(container.ch == _T('.') || container.ch == _T(')')) && container.start != 1)
{
/* Noop. Ordered list cannot interrupt a paragraph unless the start index is 1. */
} else {
total_indent += container.contents_indent - container.mark_indent;
line->indent = md_line_indentation(ctx, total_indent, off, &off);
total_indent += line->indent;
line->beg = off;
line->data = container.ch;
/* Some of the following whitespace actually still belongs to the mark. */
if(off >= ctx->size || ISNEWLINE(off)) {
container.contents_indent++;
} else if(line->indent <= ctx->code_indent_offset) {
container.contents_indent += line->indent;
line->indent = 0;
} else {
container.contents_indent += 1;
line->indent--;
}
if(n_brothers + n_children == 0)
pivot_line = &md_dummy_blank_line;
if(n_children == 0)
MD_CHECK(md_leave_child_containers(ctx, n_parents + n_brothers));
n_children++;
MD_CHECK(md_push_container(ctx, &container));
continue;
}
}
/* Check whether we are table continuation. */
if(pivot_line->type == MD_LINE_TABLE && n_parents == ctx->n_containers) {
line->type = MD_LINE_TABLE;
break;
}
/* Check for ATX header. */
if(line->indent < ctx->code_indent_offset && CH(off) == _T('#')) {
unsigned level;
if(md_is_atxheader_line(ctx, off, &line->beg, &off, &level)) {
line->type = MD_LINE_ATXHEADER;
line->data = level;
break;
}
}
/* Check whether we are starting code fence. */
if(CH(off) == _T('`') || CH(off) == _T('~')) {
if(md_is_opening_code_fence(ctx, off, &off)) {
line->type = MD_LINE_FENCEDCODE;
line->data = 1;
break;
}
}
/* Check for start of raw HTML block. */
if(CH(off) == _T('<') && !(ctx->parser.flags & MD_FLAG_NOHTMLBLOCKS))
{
ctx->html_block_type = md_is_html_block_start_condition(ctx, off);
/* HTML block type 7 cannot interrupt paragraph. */
if(ctx->html_block_type == 7 && pivot_line->type == MD_LINE_TEXT)
ctx->html_block_type = 0;
if(ctx->html_block_type > 0) {
/* The line itself also may immediately close the block. */
if(md_is_html_block_end_condition(ctx, off, &off) == ctx->html_block_type) {
/* Make sure this is the last line of the block. */
ctx->html_block_type = 0;
}
line->type = MD_LINE_HTML;
break;
}
}
/* Check for table underline. */
if((ctx->parser.flags & MD_FLAG_TABLES) && pivot_line->type == MD_LINE_TEXT &&
(CH(off) == _T('|') || CH(off) == _T('-') || CH(off) == _T(':')) &&
n_parents == ctx->n_containers)
{
unsigned col_count;
if(ctx->current_block != NULL && ctx->current_block->n_lines == 1 &&
md_is_table_underline(ctx, off, &off, &col_count))
{
line->data = col_count;
line->type = MD_LINE_TABLEUNDERLINE;
break;
}
}
/* By default, we are normal text line. */
line->type = MD_LINE_TEXT;
if(pivot_line->type == MD_LINE_TEXT && n_brothers + n_children == 0) {
/* Lazy continuation. */
n_parents = ctx->n_containers;
}
/* Check for task mark. */
if((ctx->parser.flags & MD_FLAG_TASKLISTS) && n_brothers + n_children > 0 &&
ISANYOF_(ctx->containers[ctx->n_containers-1].ch, _T("-+*.)")))
{
OFF tmp = off;
while(tmp < ctx->size && tmp < off + 3 && ISBLANK(tmp))
tmp++;
if(tmp + 2 < ctx->size && CH(tmp) == _T('[') &&
ISANYOF(tmp+1, _T("xX ")) && CH(tmp+2) == _T(']') &&
(tmp + 3 == ctx->size || ISBLANK(tmp+3) || ISNEWLINE(tmp+3)))
{
MD_CONTAINER* task_container = (n_children > 0 ? &ctx->containers[ctx->n_containers-1] : &container);
task_container->is_task = TRUE;
task_container->task_mark_off = tmp + 1;
off = tmp + 3;
while(ISWHITESPACE(off))
off++;
line->beg = off;
}
}
break;
}
/* Scan for end of the line.
*
* Note this is quite a bottleneck of the parsing as we here iterate almost
* over compete document.
*/
#if defined __linux__ && !defined MD4C_USE_UTF16
/* Recent glibc versions have superbly optimized strcspn(), even using
* vectorization if available. */
if(ctx->doc_ends_with_newline && off < ctx->size) {
while(TRUE) {
off += (OFF) strcspn(STR(off), "\r\n");
/* strcspn() can stop on zero terminator; but that can appear
* anywhere in the Markfown input... */
if(CH(off) == _T('\0'))
off++;
else
break;
}
} else
#endif
{
/* Optimization: Use some loop unrolling. */
while(off + 3 < ctx->size && !ISNEWLINE(off+0) && !ISNEWLINE(off+1)
&& !ISNEWLINE(off+2) && !ISNEWLINE(off+3))
off += 4;
while(off < ctx->size && !ISNEWLINE(off))
off++;
}
/* Set end of the line. */
line->end = off;
/* But for ATX header, we should exclude the optional trailing mark. */
if(line->type == MD_LINE_ATXHEADER) {
OFF tmp = line->end;
while(tmp > line->beg && CH(tmp-1) == _T(' '))
tmp--;
while(tmp > line->beg && CH(tmp-1) == _T('#'))
tmp--;
if(tmp == line->beg || CH(tmp-1) == _T(' ') || (ctx->parser.flags & MD_FLAG_PERMISSIVEATXHEADERS))
line->end = tmp;
}
/* Trim trailing spaces. */
if(line->type != MD_LINE_INDENTEDCODE && line->type != MD_LINE_FENCEDCODE) {
while(line->end > line->beg && CH(line->end-1) == _T(' '))
line->end--;
}
/* Eat also the new line. */
if(off < ctx->size && CH(off) == _T('\r'))
off++;
if(off < ctx->size && CH(off) == _T('\n'))
off++;
*p_end = off;
/* If we belong to a list after seeing a blank line, the list is loose. */
if(prev_line_has_list_loosening_effect && line->type != MD_LINE_BLANK && n_parents + n_brothers > 0) {
MD_CONTAINER* c = &ctx->containers[n_parents + n_brothers - 1];
if(c->ch != _T('>')) {
MD_BLOCK* block = (MD_BLOCK*) (((char*)ctx->block_bytes) + c->block_byte_off);
block->flags |= MD_BLOCK_LOOSE_LIST;
}
}
/* Leave any containers we are not part of anymore. */
if(n_children == 0 && n_parents + n_brothers < ctx->n_containers)
MD_CHECK(md_leave_child_containers(ctx, n_parents + n_brothers));
/* Enter any container we found a mark for. */
if(n_brothers > 0) {
MD_ASSERT(n_brothers == 1);
MD_CHECK(md_push_container_bytes(ctx, MD_BLOCK_LI,
ctx->containers[n_parents].task_mark_off,
(ctx->containers[n_parents].is_task ? CH(ctx->containers[n_parents].task_mark_off) : 0),
MD_BLOCK_CONTAINER_CLOSER));
MD_CHECK(md_push_container_bytes(ctx, MD_BLOCK_LI,
container.task_mark_off,
(container.is_task ? CH(container.task_mark_off) : 0),
MD_BLOCK_CONTAINER_OPENER));
ctx->containers[n_parents].is_task = container.is_task;
ctx->containers[n_parents].task_mark_off = container.task_mark_off;
}
if(n_children > 0)
MD_CHECK(md_enter_child_containers(ctx, n_children, line->data));
abort:
return ret;
}
static int
md_process_line(MD_CTX* ctx, const MD_LINE_ANALYSIS** p_pivot_line, MD_LINE_ANALYSIS* line)
{
const MD_LINE_ANALYSIS* pivot_line = *p_pivot_line;
int ret = 0;
/* Blank line ends current leaf block. */
if(line->type == MD_LINE_BLANK) {
MD_CHECK(md_end_current_block(ctx));
*p_pivot_line = &md_dummy_blank_line;
return 0;
}
/* Some line types form block on their own. */
if(line->type == MD_LINE_HR || line->type == MD_LINE_ATXHEADER) {
MD_CHECK(md_end_current_block(ctx));
/* Add our single-line block. */
MD_CHECK(md_start_new_block(ctx, line));
MD_CHECK(md_add_line_into_current_block(ctx, line));
MD_CHECK(md_end_current_block(ctx));
*p_pivot_line = &md_dummy_blank_line;
return 0;
}
/* MD_LINE_SETEXTUNDERLINE changes meaning of the current block and ends it. */
if(line->type == MD_LINE_SETEXTUNDERLINE) {
MD_ASSERT(ctx->current_block != NULL);
ctx->current_block->type = MD_BLOCK_H;
ctx->current_block->data = line->data;
ctx->current_block->flags |= MD_BLOCK_SETEXT_HEADER;
MD_CHECK(md_add_line_into_current_block(ctx, line));
MD_CHECK(md_end_current_block(ctx));
if(ctx->current_block == NULL) {
*p_pivot_line = &md_dummy_blank_line;
} else {
/* This happens if we have consumed all the body as link ref. defs.
* and downgraded the underline into start of a new paragraph block. */
line->type = MD_LINE_TEXT;
*p_pivot_line = line;
}
return 0;
}
/* MD_LINE_TABLEUNDERLINE changes meaning of the current block. */
if(line->type == MD_LINE_TABLEUNDERLINE) {
MD_ASSERT(ctx->current_block != NULL);
MD_ASSERT(ctx->current_block->n_lines == 1);
ctx->current_block->type = MD_BLOCK_TABLE;
ctx->current_block->data = line->data;
MD_ASSERT(pivot_line != &md_dummy_blank_line);
((MD_LINE_ANALYSIS*)pivot_line)->type = MD_LINE_TABLE;
MD_CHECK(md_add_line_into_current_block(ctx, line));
return 0;
}
/* The current block also ends if the line has different type. */
if(line->type != pivot_line->type)
MD_CHECK(md_end_current_block(ctx));
/* The current line may start a new block. */
if(ctx->current_block == NULL) {
MD_CHECK(md_start_new_block(ctx, line));
*p_pivot_line = line;
}
/* In all other cases the line is just a continuation of the current block. */
MD_CHECK(md_add_line_into_current_block(ctx, line));
abort:
return ret;
}
static int
md_process_doc(MD_CTX *ctx)
{
const MD_LINE_ANALYSIS* pivot_line = &md_dummy_blank_line;
MD_LINE_ANALYSIS line_buf[2];
MD_LINE_ANALYSIS* line = &line_buf[0];
OFF off = 0;
int ret = 0;
MD_ENTER_BLOCK(MD_BLOCK_DOC, NULL);
while(off < ctx->size) {
if(line == pivot_line)
line = (line == &line_buf[0] ? &line_buf[1] : &line_buf[0]);
MD_CHECK(md_analyze_line(ctx, off, &off, pivot_line, line));
MD_CHECK(md_process_line(ctx, &pivot_line, line));
}
md_end_current_block(ctx);
MD_CHECK(md_build_ref_def_hashtable(ctx));
/* Process all blocks. */
MD_CHECK(md_leave_child_containers(ctx, 0));
MD_CHECK(md_process_all_blocks(ctx));
MD_LEAVE_BLOCK(MD_BLOCK_DOC, NULL);
abort:
#if 0
/* Output some memory consumption statistics. */
{
char buffer[256];
sprintf(buffer, "Alloced %u bytes for block buffer.",
(unsigned)(ctx->alloc_block_bytes));
MD_LOG(buffer);
sprintf(buffer, "Alloced %u bytes for containers buffer.",
(unsigned)(ctx->alloc_containers * sizeof(MD_CONTAINER)));
MD_LOG(buffer);
sprintf(buffer, "Alloced %u bytes for marks buffer.",
(unsigned)(ctx->alloc_marks * sizeof(MD_MARK)));
MD_LOG(buffer);
sprintf(buffer, "Alloced %u bytes for aux. buffer.",
(unsigned)(ctx->alloc_buffer * sizeof(MD_CHAR)));
MD_LOG(buffer);
}
#endif
return ret;
}
/********************
*** Public API ***
********************/
int
md_parse(const MD_CHAR* text, MD_SIZE size, const MD_PARSER* parser, void* userdata)
{
MD_CTX ctx;
int i;
int ret;
if(parser->abi_version != 0) {
if(parser->debug_log != NULL)
parser->debug_log("Unsupported abi_version.", userdata);
return -1;
}
/* Setup context structure. */
memset(&ctx, 0, sizeof(MD_CTX));
ctx.text = text;
ctx.size = size;
memcpy(&ctx.parser, parser, sizeof(MD_PARSER));
ctx.userdata = userdata;
ctx.code_indent_offset = (ctx.parser.flags & MD_FLAG_NOINDENTEDCODEBLOCKS) ? (OFF)(-1) : 4;
md_build_mark_char_map(&ctx);
ctx.doc_ends_with_newline = (size > 0 && ISNEWLINE_(text[size-1]));
/* Reset all unresolved opener mark chains. */
for(i = 0; i < (int) SIZEOF_ARRAY(ctx.mark_chains); i++) {
ctx.mark_chains[i].head = -1;
ctx.mark_chains[i].tail = -1;
}
ctx.unresolved_link_head = -1;
ctx.unresolved_link_tail = -1;
/* All the work. */
ret = md_process_doc(&ctx);
/* Clean-up. */
md_free_ref_defs(&ctx);
md_free_ref_def_hashtable(&ctx);
free(ctx.buffer);
free(ctx.marks);
free(ctx.block_bytes);
free(ctx.containers);
return ret;
}
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