Merge pull request #251 from ewestbrook/ltn12tblsrc

Add ltn12.source.table()

doc/ltn12.html

@@ -405,6 +405,16 @@ Creates and returns a source that produces the contents of a
 <tt>string</tt>, chunk by chunk. 
 </p>
 
+<!-- table +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
+
+<p class=name id="source.table">
+ltn12.source.<b>table(</b>table<b>)</b>
+</p>
+
+<p class=description>
+Creates and returns a source that produces the numerically-indexed values of a <tt>table</tt> successively beginning at 1.  The source returns nil (end-of-stream) whenever a nil value is produced by the current index, which proceeds forward regardless.
+</p>
+
 <!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
 
 <div class=footer>

doc/reference.html

@@ -99,7 +99,8 @@ Support, Manual">
 <a href="ltn12.html#source.error">error</a>,
 <a href="ltn12.html#source.file">file</a>,
 <a href="ltn12.html#source.simplify">simplify</a>,
-<a href="ltn12.html#source.string">string</a>.
+<a href="ltn12.html#source.string">string</a>,
+<a href="ltn12.html#source.table">table</a>.
 </blockquote>
 </blockquote>
 

src/ltn12.lua

@@ -128,6 +128,16 @@ function source.string(s)
     else return source.empty() end
 end
 
+-- creates table source
+function source.table(t)
+    base.assert('table' == type(t))
+    local i = 0
+    return function()
+        i = i + 1
+        return t[i]
+    end
+end
+
 -- creates rewindable source
 function source.rewind(src)
     base.assert(src)

test/ltn12test.lua

@@ -180,6 +180,15 @@ assert(ltn12.pump.all(source, sink), "returned error")
 assert(table.concat(t) == s, "mismatch")
 print("ok")
 
+--------------------------------
+io.write("testing source.table: ")
+local inp = {'a','b','c','d','e'}
+local source = ltn12.source.table(inp)
+sink, t = ltn12.sink.table()
+assert(ltn12.pump.all(source, sink), "returned error")
+for i = 1, #inp do assert(t[i] == inp[i], "mismatch") end
+print("ok")
+
 --------------------------------
 io.write("testing source.chain (with split): ")
 source = ltn12.source.string(s)