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398 lines
14 KiB
C
398 lines
14 KiB
C
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/*
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* MD4C: Markdown parser for C
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* (http://github.com/mity/md4c)
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*
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* Copyright (c) 2016-2020 Martin Mitas
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef MD4C_H
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#define MD4C_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if defined MD4C_USE_UTF16
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/* Magic to support UTF-16. Note that in order to use it, you have to define
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* the macro MD4C_USE_UTF16 both when building MD4C as well as when
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* including this header in your code. */
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#ifdef _WIN32
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#include <windows.h>
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typedef WCHAR MD_CHAR;
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#else
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#error MD4C_USE_UTF16 is only supported on Windows.
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#endif
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#else
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typedef char MD_CHAR;
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#endif
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typedef unsigned MD_SIZE;
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typedef unsigned MD_OFFSET;
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/* Block represents a part of document hierarchy structure like a paragraph
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* or list item.
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*/
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typedef enum MD_BLOCKTYPE {
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/* <body>...</body> */
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MD_BLOCK_DOC = 0,
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/* <blockquote>...</blockquote> */
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MD_BLOCK_QUOTE,
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/* <ul>...</ul>
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* Detail: Structure MD_BLOCK_UL_DETAIL. */
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MD_BLOCK_UL,
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/* <ol>...</ol>
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* Detail: Structure MD_BLOCK_OL_DETAIL. */
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MD_BLOCK_OL,
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/* <li>...</li>
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* Detail: Structure MD_BLOCK_LI_DETAIL. */
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MD_BLOCK_LI,
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/* <hr> */
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MD_BLOCK_HR,
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/* <h1>...</h1> (for levels up to 6)
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* Detail: Structure MD_BLOCK_H_DETAIL. */
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MD_BLOCK_H,
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/* <pre><code>...</code></pre>
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* Note the text lines within code blocks are terminated with '\n'
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* instead of explicit MD_TEXT_BR. */
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MD_BLOCK_CODE,
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/* Raw HTML block. This itself does not correspond to any particular HTML
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* tag. The contents of it _is_ raw HTML source intended to be put
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* in verbatim form to the HTML output. */
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MD_BLOCK_HTML,
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/* <p>...</p> */
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MD_BLOCK_P,
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/* <table>...</table> and its contents.
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* Detail: Structure MD_BLOCK_TD_DETAIL (used with MD_BLOCK_TH and MD_BLOCK_TD)
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* Note all of these are used only if extension MD_FLAG_TABLES is enabled. */
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MD_BLOCK_TABLE,
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MD_BLOCK_THEAD,
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MD_BLOCK_TBODY,
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MD_BLOCK_TR,
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MD_BLOCK_TH,
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MD_BLOCK_TD
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} MD_BLOCKTYPE;
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/* Span represents an in-line piece of a document which should be rendered with
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* the same font, color and other attributes. A sequence of spans forms a block
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* like paragraph or list item. */
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typedef enum MD_SPANTYPE {
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/* <em>...</em> */
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MD_SPAN_EM,
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/* <strong>...</strong> */
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MD_SPAN_STRONG,
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/* <a href="xxx">...</a>
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* Detail: Structure MD_SPAN_A_DETAIL. */
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MD_SPAN_A,
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/* <img src="xxx">...</a>
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* Detail: Structure MD_SPAN_IMG_DETAIL.
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* Note: Image text can contain nested spans and even nested images.
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* If rendered into ALT attribute of HTML <IMG> tag, it's responsibility
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* of the parser to deal with it.
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*/
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MD_SPAN_IMG,
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/* <code>...</code> */
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MD_SPAN_CODE,
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/* <del>...</del>
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* Note: Recognized only when MD_FLAG_STRIKETHROUGH is enabled.
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*/
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MD_SPAN_DEL,
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/* For recognizing inline ($) and display ($$) equations
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* Note: Recognized only when MD_FLAG_LATEXMATHSPANS is enabled.
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*/
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MD_SPAN_LATEXMATH,
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MD_SPAN_LATEXMATH_DISPLAY,
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/* Wiki links
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* Note: Recognized only when MD_FLAG_WIKILINKS is enabled.
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*/
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MD_SPAN_WIKILINK,
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/* <u>...</u>
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* Note: Recognized only when MD_FLAG_UNDERLINE is enabled. */
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MD_SPAN_U
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} MD_SPANTYPE;
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/* Text is the actual textual contents of span. */
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typedef enum MD_TEXTTYPE {
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/* Normal text. */
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MD_TEXT_NORMAL = 0,
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/* NULL character. CommonMark requires replacing NULL character with
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* the replacement char U+FFFD, so this allows caller to do that easily. */
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MD_TEXT_NULLCHAR,
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/* Line breaks.
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* Note these are not sent from blocks with verbatim output (MD_BLOCK_CODE
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* or MD_BLOCK_HTML). In such cases, '\n' is part of the text itself. */
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MD_TEXT_BR, /* <br> (hard break) */
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MD_TEXT_SOFTBR, /* '\n' in source text where it is not semantically meaningful (soft break) */
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/* Entity.
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* (a) Named entity, e.g.
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* (Note MD4C does not have a list of known entities.
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* Anything matching the regexp /&[A-Za-z][A-Za-z0-9]{1,47};/ is
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* treated as a named entity.)
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* (b) Numerical entity, e.g. Ӓ
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* (c) Hexadecimal entity, e.g. ካ
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*
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* As MD4C is mostly encoding agnostic, application gets the verbatim
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* entity text into the MD_PARSER::text_callback(). */
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MD_TEXT_ENTITY,
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/* Text in a code block (inside MD_BLOCK_CODE) or inlined code (`code`).
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* If it is inside MD_BLOCK_CODE, it includes spaces for indentation and
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* '\n' for new lines. MD_TEXT_BR and MD_TEXT_SOFTBR are not sent for this
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* kind of text. */
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MD_TEXT_CODE,
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/* Text is a raw HTML. If it is contents of a raw HTML block (i.e. not
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* an inline raw HTML), then MD_TEXT_BR and MD_TEXT_SOFTBR are not used.
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* The text contains verbatim '\n' for the new lines. */
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MD_TEXT_HTML,
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/* Text is inside an equation. This is processed the same way as inlined code
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* spans (`code`). */
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MD_TEXT_LATEXMATH
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} MD_TEXTTYPE;
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/* Alignment enumeration. */
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typedef enum MD_ALIGN {
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MD_ALIGN_DEFAULT = 0, /* When unspecified. */
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MD_ALIGN_LEFT,
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MD_ALIGN_CENTER,
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MD_ALIGN_RIGHT
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} MD_ALIGN;
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/* String attribute.
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*
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* This wraps strings which are outside of a normal text flow and which are
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* propagated within various detailed structures, but which still may contain
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* string portions of different types like e.g. entities.
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*
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* So, for example, lets consider this image:
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*
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* ![image alt text](http://example.org/image.png 'foo " bar')
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*
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* The image alt text is propagated as a normal text via the MD_PARSER::text()
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* callback. However, the image title ('foo " bar') is propagated as
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* MD_ATTRIBUTE in MD_SPAN_IMG_DETAIL::title.
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*
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* Then the attribute MD_SPAN_IMG_DETAIL::title shall provide the following:
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* -- [0]: "foo " (substr_types[0] == MD_TEXT_NORMAL; substr_offsets[0] == 0)
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* -- [1]: """ (substr_types[1] == MD_TEXT_ENTITY; substr_offsets[1] == 4)
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* -- [2]: " bar" (substr_types[2] == MD_TEXT_NORMAL; substr_offsets[2] == 10)
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* -- [3]: (n/a) (n/a ; substr_offsets[3] == 14)
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*
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* Note that these invariants are always guaranteed:
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* -- substr_offsets[0] == 0
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* -- substr_offsets[LAST+1] == size
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* -- Currently, only MD_TEXT_NORMAL, MD_TEXT_ENTITY, MD_TEXT_NULLCHAR
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* substrings can appear. This could change only of the specification
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* changes.
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*/
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typedef struct MD_ATTRIBUTE {
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const MD_CHAR* text;
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MD_SIZE size;
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const MD_TEXTTYPE* substr_types;
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const MD_OFFSET* substr_offsets;
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} MD_ATTRIBUTE;
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/* Detailed info for MD_BLOCK_UL. */
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typedef struct MD_BLOCK_UL_DETAIL {
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int is_tight; /* Non-zero if tight list, zero if loose. */
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MD_CHAR mark; /* Item bullet character in MarkDown source of the list, e.g. '-', '+', '*'. */
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} MD_BLOCK_UL_DETAIL;
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/* Detailed info for MD_BLOCK_OL. */
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typedef struct MD_BLOCK_OL_DETAIL {
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unsigned start; /* Start index of the ordered list. */
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int is_tight; /* Non-zero if tight list, zero if loose. */
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MD_CHAR mark_delimiter; /* Character delimiting the item marks in MarkDown source, e.g. '.' or ')' */
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} MD_BLOCK_OL_DETAIL;
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/* Detailed info for MD_BLOCK_LI. */
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typedef struct MD_BLOCK_LI_DETAIL {
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int is_task; /* Can be non-zero only with MD_FLAG_TASKLISTS */
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MD_CHAR task_mark; /* If is_task, then one of 'x', 'X' or ' '. Undefined otherwise. */
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MD_OFFSET task_mark_offset; /* If is_task, then offset in the input of the char between '[' and ']'. */
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} MD_BLOCK_LI_DETAIL;
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/* Detailed info for MD_BLOCK_H. */
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typedef struct MD_BLOCK_H_DETAIL {
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unsigned level; /* Header level (1 - 6) */
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} MD_BLOCK_H_DETAIL;
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/* Detailed info for MD_BLOCK_CODE. */
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typedef struct MD_BLOCK_CODE_DETAIL {
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MD_ATTRIBUTE info;
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MD_ATTRIBUTE lang;
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MD_CHAR fence_char; /* The character used for fenced code block; or zero for indented code block. */
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} MD_BLOCK_CODE_DETAIL;
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/* Detailed info for MD_BLOCK_TH and MD_BLOCK_TD. */
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typedef struct MD_BLOCK_TD_DETAIL {
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MD_ALIGN align;
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} MD_BLOCK_TD_DETAIL;
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/* Detailed info for MD_SPAN_A. */
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typedef struct MD_SPAN_A_DETAIL {
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MD_ATTRIBUTE href;
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MD_ATTRIBUTE title;
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} MD_SPAN_A_DETAIL;
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/* Detailed info for MD_SPAN_IMG. */
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typedef struct MD_SPAN_IMG_DETAIL {
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MD_ATTRIBUTE src;
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MD_ATTRIBUTE title;
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} MD_SPAN_IMG_DETAIL;
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/* Detailed info for MD_SPAN_WIKILINK. */
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typedef struct MD_SPAN_WIKILINK {
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MD_ATTRIBUTE target;
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} MD_SPAN_WIKILINK_DETAIL;
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/* Flags specifying extensions/deviations from CommonMark specification.
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*
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* By default (when MD_PARSER::flags == 0), we follow CommonMark specification.
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* The following flags may allow some extensions or deviations from it.
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*/
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#define MD_FLAG_COLLAPSEWHITESPACE 0x0001 /* In MD_TEXT_NORMAL, collapse non-trivial whitespace into single ' ' */
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#define MD_FLAG_PERMISSIVEATXHEADERS 0x0002 /* Do not require space in ATX headers ( ###header ) */
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#define MD_FLAG_PERMISSIVEURLAUTOLINKS 0x0004 /* Recognize URLs as autolinks even without '<', '>' */
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#define MD_FLAG_PERMISSIVEEMAILAUTOLINKS 0x0008 /* Recognize e-mails as autolinks even without '<', '>' and 'mailto:' */
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#define MD_FLAG_NOINDENTEDCODEBLOCKS 0x0010 /* Disable indented code blocks. (Only fenced code works.) */
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#define MD_FLAG_NOHTMLBLOCKS 0x0020 /* Disable raw HTML blocks. */
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#define MD_FLAG_NOHTMLSPANS 0x0040 /* Disable raw HTML (inline). */
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#define MD_FLAG_TABLES 0x0100 /* Enable tables extension. */
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#define MD_FLAG_STRIKETHROUGH 0x0200 /* Enable strikethrough extension. */
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#define MD_FLAG_PERMISSIVEWWWAUTOLINKS 0x0400 /* Enable WWW autolinks (even without any scheme prefix, if they begin with 'www.') */
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#define MD_FLAG_TASKLISTS 0x0800 /* Enable task list extension. */
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#define MD_FLAG_LATEXMATHSPANS 0x1000 /* Enable $ and $$ containing LaTeX equations. */
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#define MD_FLAG_WIKILINKS 0x2000 /* Enable wiki links extension. */
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#define MD_FLAG_UNDERLINE 0x4000 /* Enable underline extension (and disables '_' for normal emphasis). */
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#define MD_FLAG_PERMISSIVEAUTOLINKS (MD_FLAG_PERMISSIVEEMAILAUTOLINKS | MD_FLAG_PERMISSIVEURLAUTOLINKS | MD_FLAG_PERMISSIVEWWWAUTOLINKS)
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#define MD_FLAG_NOHTML (MD_FLAG_NOHTMLBLOCKS | MD_FLAG_NOHTMLSPANS)
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/* Convenient sets of flags corresponding to well-known Markdown dialects.
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*
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* Note we may only support subset of features of the referred dialect.
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* The constant just enables those extensions which bring us as close as
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* possible given what features we implement.
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*
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* ABI compatibility note: Meaning of these can change in time as new
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* extensions, bringing the dialect closer to the original, are implemented.
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*/
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#define MD_DIALECT_COMMONMARK 0
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#define MD_DIALECT_GITHUB (MD_FLAG_PERMISSIVEAUTOLINKS | MD_FLAG_TABLES | MD_FLAG_STRIKETHROUGH | MD_FLAG_TASKLISTS)
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/* Parser structure.
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*/
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typedef struct MD_PARSER {
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/* Reserved. Set to zero.
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*/
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unsigned abi_version;
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/* Dialect options. Bitmask of MD_FLAG_xxxx values.
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*/
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unsigned flags;
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/* Caller-provided rendering callbacks.
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*
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* For some block/span types, more detailed information is provided in a
|
||
|
|
* type-specific structure pointed by the argument 'detail'.
|
||
|
|
*
|
||
|
|
* The last argument of all callbacks, 'userdata', is just propagated from
|
||
|
|
* md_parse() and is available for any use by the application.
|
||
|
|
*
|
||
|
|
* Note any strings provided to the callbacks as their arguments or as
|
||
|
|
* members of any detail structure are generally not zero-terminated.
|
||
|
|
* Application has to take the respective size information into account.
|
||
|
|
*
|
||
|
|
* Any rendering callback may abort further parsing of the document by
|
||
|
|
* returning non-zero.
|
||
|
|
*/
|
||
|
|
int (*enter_block)(MD_BLOCKTYPE /*type*/, void* /*detail*/, void* /*userdata*/);
|
||
|
|
int (*leave_block)(MD_BLOCKTYPE /*type*/, void* /*detail*/, void* /*userdata*/);
|
||
|
|
|
||
|
|
int (*enter_span)(MD_SPANTYPE /*type*/, void* /*detail*/, void* /*userdata*/);
|
||
|
|
int (*leave_span)(MD_SPANTYPE /*type*/, void* /*detail*/, void* /*userdata*/);
|
||
|
|
|
||
|
|
int (*text)(MD_TEXTTYPE /*type*/, const MD_CHAR* /*text*/, MD_SIZE /*size*/, void* /*userdata*/);
|
||
|
|
|
||
|
|
/* Debug callback. Optional (may be NULL).
|
||
|
|
*
|
||
|
|
* If provided and something goes wrong, this function gets called.
|
||
|
|
* This is intended for debugging and problem diagnosis for developers;
|
||
|
|
* it is not intended to provide any errors suitable for displaying to an
|
||
|
|
* end user.
|
||
|
|
*/
|
||
|
|
void (*debug_log)(const char* /*msg*/, void* /*userdata*/);
|
||
|
|
|
||
|
|
/* Reserved. Set to NULL.
|
||
|
|
*/
|
||
|
|
void (*syntax)(void);
|
||
|
|
} MD_PARSER;
|
||
|
|
|
||
|
|
|
||
|
|
/* For backward compatibility. Do not use in new code.
|
||
|
|
*/
|
||
|
|
typedef MD_PARSER MD_RENDERER;
|
||
|
|
|
||
|
|
|
||
|
|
/* Parse the Markdown document stored in the string 'text' of size 'size'.
|
||
|
|
* The parser provides callbacks to be called during the parsing so the
|
||
|
|
* caller can render the document on the screen or convert the Markdown
|
||
|
|
* to another format.
|
||
|
|
*
|
||
|
|
* Zero is returned on success. If a runtime error occurs (e.g. a memory
|
||
|
|
* fails), -1 is returned. If the processing is aborted due any callback
|
||
|
|
* returning non-zero, the return value of the callback is returned.
|
||
|
|
*/
|
||
|
|
int md_parse(const MD_CHAR* text, MD_SIZE size, const MD_PARSER* parser, void* userdata);
|
||
|
|
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
} /* extern "C" { */
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* MD4C_H */
|