rudimentary latex backend, additional cleanup

Makefile

@@ -2,7 +2,9 @@ include $(GOROOT)/src/Make.inc
 
 TARG=github.com/russross/blackfriday
 
-GOFILES=markdown.go block.go inline.go html.go smartypants.go
+GOFILES=markdown.go block.go inline.go html.go smartypants.go latex.go
+
+all: package markdown
 
 include $(GOROOT)/src/Make.pkg
 

README.md

@@ -79,12 +79,26 @@ implements two additional Smartypants options:
     cases). For example, `4/5` becomes `<sup>4</sup>&frasl;<sub>5</sub>`
 
 
+LaTeX Output
+------------
+
+A rudimentary LaTeX rendering backend is also included. To see an
+example of its usage, comment out this link in `main.go`:
+
+    renderer := blackfriday.HtmlRenderer(html_flags)
+
+and uncomment this line:
+
+    renderer := blackfriday.LatexRenderer(0)
+
+It renders some basic documents, but is only experimental at this point.
+
+
 Todo
 ----
 
 *   Code cleanup
 *   Better code documentation
-*   Implement a LaTeX backend
 
 
    [1]: http://daringfireball.net/projects/markdown/ "Markdown"

block.go

@@ -514,7 +514,7 @@ func blockTable(out *bytes.Buffer, rndr *render, data []byte) int {
 		}
 
 		if rndr.mk.table != nil {
-			rndr.mk.table(out, header_work.Bytes(), body_work.Bytes(), rndr.mk.opaque)
+			rndr.mk.table(out, header_work.Bytes(), body_work.Bytes(), col_data, rndr.mk.opaque)
 		}
 	}
 

example/Makefile

@@ -4,8 +4,9 @@ TARG=markdown
 
 GOFILES=main.go
 
-LIBBF=github.com/russross/blackfriday
+markdown: ../_obj/github.com/russross/blackfriday.a
 
-PREREQ += ../_obj/$(LIBBF).a
+GC += -I../_obj/
+LD += -L../_obj/
 
 include $(GOROOT)/src/Make.cmd

example/main.go

@@ -57,8 +57,13 @@ func main() {
 	html_flags |= blackfriday.HTML_SMARTYPANTS_FRACTIONS
 	html_flags |= blackfriday.HTML_SMARTYPANTS_LATEX_DASHES
 
-	// render the data
+	// render the data into HTML (comment this out to deselect HTML)
-	output := blackfriday.Markdown(input, blackfriday.HtmlRenderer(html_flags), extensions)
+    renderer := blackfriday.HtmlRenderer(html_flags)
+
+    // render the data into LaTeX (uncomment to select LaTeX)
+    //renderer := blackfriday.LatexRenderer(0)
+
+	output := blackfriday.Markdown(input, renderer, extensions)
 
 	// output the result
 	if len(os.Args) == 3 {

html.go

@@ -65,8 +65,8 @@ func HtmlRenderer(flags int) *Renderer {
 	r.listitem = htmlListitem
 	r.paragraph = htmlParagraph
 	r.table = htmlTable
-	r.tableRow = htmlTablerow
+	r.tableRow = htmlTableRow
-	r.tableCell = htmlTablecell
+	r.tableCell = htmlTableCell
 
 	r.autolink = htmlAutolink
 	r.codespan = htmlCodespan
@@ -120,7 +120,7 @@ func HtmlTocRenderer(flags int) *Renderer {
 	return r
 }
 
-func attrEscape(ob *bytes.Buffer, src []byte) {
+func attrEscape(out *bytes.Buffer, src []byte) {
 	for i := 0; i < len(src); i++ {
 		// directly copy normal characters
 		org := i
@@ -128,7 +128,7 @@ func attrEscape(ob *bytes.Buffer, src []byte) {
 			i++
 		}
 		if i > org {
-			ob.Write(src[org:i])
+			out.Write(src[org:i])
 		}
 
 		// escape a character
@@ -137,36 +137,36 @@ func attrEscape(ob *bytes.Buffer, src []byte) {
 		}
 		switch src[i] {
 		case '<':
-			ob.WriteString("&lt;")
+			out.WriteString("&lt;")
 		case '>':
-			ob.WriteString("&gt;")
+			out.WriteString("&gt;")
 		case '&':
-			ob.WriteString("&amp;")
+			out.WriteString("&amp;")
 		case '"':
-			ob.WriteString("&quot;")
+			out.WriteString("&quot;")
 		}
 	}
 }
 
-func htmlHeader(ob *bytes.Buffer, text []byte, level int, opaque interface{}) {
+func htmlHeader(out *bytes.Buffer, text []byte, level int, opaque interface{}) {
 	options := opaque.(*htmlOptions)
 
-	if ob.Len() > 0 {
+	if out.Len() > 0 {
-		ob.WriteByte('\n')
+		out.WriteByte('\n')
 	}
 
 	if options.flags&HTML_TOC != 0 {
-		ob.WriteString(fmt.Sprintf("<h%d id=\"toc_%d\">", level, options.toc_data.header_count))
+		out.WriteString(fmt.Sprintf("<h%d id=\"toc_%d\">", level, options.toc_data.header_count))
 		options.toc_data.header_count++
 	} else {
-		ob.WriteString(fmt.Sprintf("<h%d>", level))
+		out.WriteString(fmt.Sprintf("<h%d>", level))
 	}
 
-	ob.Write(text)
+	out.Write(text)
-	ob.WriteString(fmt.Sprintf("</h%d>\n", level))
+	out.WriteString(fmt.Sprintf("</h%d>\n", level))
 }
 
-func htmlRawBlock(ob *bytes.Buffer, text []byte, opaque interface{}) {
+func htmlRawBlock(out *bytes.Buffer, text []byte, opaque interface{}) {
 	sz := len(text)
 	for sz > 0 && text[sz-1] == '\n' {
 		sz--
@@ -178,30 +178,30 @@ func htmlRawBlock(ob *bytes.Buffer, text []byte, opaque interface{}) {
 	if org >= sz {
 		return
 	}
-	if ob.Len() > 0 {
+	if out.Len() > 0 {
-		ob.WriteByte('\n')
+		out.WriteByte('\n')
 	}
-	ob.Write(text[org:sz])
+	out.Write(text[org:sz])
-	ob.WriteByte('\n')
+	out.WriteByte('\n')
 }
 
-func htmlHrule(ob *bytes.Buffer, opaque interface{}) {
+func htmlHrule(out *bytes.Buffer, opaque interface{}) {
 	options := opaque.(*htmlOptions)
 
-	if ob.Len() > 0 {
+	if out.Len() > 0 {
-		ob.WriteByte('\n')
+		out.WriteByte('\n')
 	}
-	ob.WriteString("<hr")
+	out.WriteString("<hr")
-	ob.WriteString(options.close_tag)
+	out.WriteString(options.close_tag)
 }
 
-func htmlBlockcode(ob *bytes.Buffer, text []byte, lang string, opaque interface{}) {
+func htmlBlockcode(out *bytes.Buffer, text []byte, lang string, opaque interface{}) {
-	if ob.Len() > 0 {
+	if out.Len() > 0 {
-		ob.WriteByte('\n')
+		out.WriteByte('\n')
 	}
 
 	if lang != "" {
-		ob.WriteString("<pre><code class=\"")
+		out.WriteString("<pre><code class=\"")
 
 		for i, cls := 0, 0; i < len(lang); i, cls = i+1, cls+1 {
 			for i < len(lang) && isspace(lang[i]) {
@@ -219,22 +219,22 @@ func htmlBlockcode(ob *bytes.Buffer, text []byte, lang string, opaque interface{
 				}
 
 				if cls > 0 {
-					ob.WriteByte(' ')
+					out.WriteByte(' ')
 				}
-				attrEscape(ob, []byte(lang[org:]))
+				attrEscape(out, []byte(lang[org:]))
 			}
 		}
 
-		ob.WriteString("\">")
+		out.WriteString("\">")
 	} else {
-		ob.WriteString("<pre><code>")
+		out.WriteString("<pre><code>")
 	}
 
 	if len(text) > 0 {
-		attrEscape(ob, text)
+		attrEscape(out, text)
 	}
 
-	ob.WriteString("</code></pre>\n")
+	out.WriteString("</code></pre>\n")
 }
 
 /*
@@ -255,13 +255,13 @@ func htmlBlockcode(ob *bytes.Buffer, text []byte, lang string, opaque interface{
  * E.g.
  *              ~~~~ {.python .numbered}        =>      <pre lang="python"><code>
  */
-func htmlBlockcodeGithub(ob *bytes.Buffer, text []byte, lang string, opaque interface{}) {
+func htmlBlockcodeGithub(out *bytes.Buffer, text []byte, lang string, opaque interface{}) {
-	if ob.Len() > 0 {
+	if out.Len() > 0 {
-		ob.WriteByte('\n')
+		out.WriteByte('\n')
 	}
 
 	if len(lang) > 0 {
-		ob.WriteString("<pre lang=\"")
+		out.WriteString("<pre lang=\"")
 
 		i := 0
 		for i < len(lang) && !isspace(lang[i]) {
@@ -269,102 +269,102 @@ func htmlBlockcodeGithub(ob *bytes.Buffer, text []byte, lang string, opaque inte
 		}
 
 		if lang[0] == '.' {
-			attrEscape(ob, []byte(lang[1:i]))
+			attrEscape(out, []byte(lang[1:i]))
 		} else {
-			attrEscape(ob, []byte(lang[:i]))
+			attrEscape(out, []byte(lang[:i]))
 		}
 
-		ob.WriteString("\"><code>")
+		out.WriteString("\"><code>")
 	} else {
-		ob.WriteString("<pre><code>")
+		out.WriteString("<pre><code>")
 	}
 
 	if len(text) > 0 {
-		attrEscape(ob, text)
+		attrEscape(out, text)
 	}
 
-	ob.WriteString("</code></pre>\n")
+	out.WriteString("</code></pre>\n")
 }
 
 
-func htmlBlockquote(ob *bytes.Buffer, text []byte, opaque interface{}) {
+func htmlBlockquote(out *bytes.Buffer, text []byte, opaque interface{}) {
-	ob.WriteString("<blockquote>\n")
+	out.WriteString("<blockquote>\n")
-	ob.Write(text)
+	out.Write(text)
-	ob.WriteString("</blockquote>")
+	out.WriteString("</blockquote>")
 }
 
-func htmlTable(ob *bytes.Buffer, header []byte, body []byte, opaque interface{}) {
+func htmlTable(out *bytes.Buffer, header []byte, body []byte, columnData []int, opaque interface{}) {
-	if ob.Len() > 0 {
+	if out.Len() > 0 {
-		ob.WriteByte('\n')
+		out.WriteByte('\n')
 	}
-	ob.WriteString("<table><thead>\n")
+	out.WriteString("<table><thead>\n")
-	ob.Write(header)
+	out.Write(header)
-	ob.WriteString("\n</thead><tbody>\n")
+	out.WriteString("\n</thead><tbody>\n")
-	ob.Write(body)
+	out.Write(body)
-	ob.WriteString("\n</tbody></table>")
+	out.WriteString("\n</tbody></table>")
 }
 
-func htmlTablerow(ob *bytes.Buffer, text []byte, opaque interface{}) {
+func htmlTableRow(out *bytes.Buffer, text []byte, opaque interface{}) {
-	if ob.Len() > 0 {
+	if out.Len() > 0 {
-		ob.WriteByte('\n')
+		out.WriteByte('\n')
 	}
-	ob.WriteString("<tr>\n")
+	out.WriteString("<tr>\n")
-	ob.Write(text)
+	out.Write(text)
-	ob.WriteString("\n</tr>")
+	out.WriteString("\n</tr>")
 }
 
-func htmlTablecell(ob *bytes.Buffer, text []byte, align int, opaque interface{}) {
+func htmlTableCell(out *bytes.Buffer, text []byte, align int, opaque interface{}) {
-	if ob.Len() > 0 {
+	if out.Len() > 0 {
-		ob.WriteByte('\n')
+		out.WriteByte('\n')
 	}
 	switch align {
 	case TABLE_ALIGNMENT_LEFT:
-		ob.WriteString("<td align=\"left\">")
+		out.WriteString("<td align=\"left\">")
 	case TABLE_ALIGNMENT_RIGHT:
-		ob.WriteString("<td align=\"right\">")
+		out.WriteString("<td align=\"right\">")
 	case TABLE_ALIGNMENT_CENTER:
-		ob.WriteString("<td align=\"center\">")
+		out.WriteString("<td align=\"center\">")
 	default:
-		ob.WriteString("<td>")
+		out.WriteString("<td>")
 	}
 
-	ob.Write(text)
+	out.Write(text)
-	ob.WriteString("</td>")
+	out.WriteString("</td>")
 }
 
-func htmlList(ob *bytes.Buffer, text []byte, flags int, opaque interface{}) {
+func htmlList(out *bytes.Buffer, text []byte, flags int, opaque interface{}) {
-	if ob.Len() > 0 {
+	if out.Len() > 0 {
-		ob.WriteByte('\n')
+		out.WriteByte('\n')
 	}
 	if flags&LIST_TYPE_ORDERED != 0 {
-		ob.WriteString("<ol>\n")
+		out.WriteString("<ol>\n")
 	} else {
-		ob.WriteString("<ul>\n")
+		out.WriteString("<ul>\n")
 	}
-	ob.Write(text)
+	out.Write(text)
 	if flags&LIST_TYPE_ORDERED != 0 {
-		ob.WriteString("</ol>\n")
+		out.WriteString("</ol>\n")
 	} else {
-		ob.WriteString("</ul>\n")
+		out.WriteString("</ul>\n")
 	}
 }
 
-func htmlListitem(ob *bytes.Buffer, text []byte, flags int, opaque interface{}) {
+func htmlListitem(out *bytes.Buffer, text []byte, flags int, opaque interface{}) {
-	ob.WriteString("<li>")
+	out.WriteString("<li>")
 	size := len(text)
 	for size > 0 && text[size-1] == '\n' {
 		size--
 	}
-	ob.Write(text[:size])
+	out.Write(text[:size])
-	ob.WriteString("</li>\n")
+	out.WriteString("</li>\n")
 }
 
-func htmlParagraph(ob *bytes.Buffer, text []byte, opaque interface{}) {
+func htmlParagraph(out *bytes.Buffer, text []byte, opaque interface{}) {
 	options := opaque.(*htmlOptions)
 	i := 0
 
-	if ob.Len() > 0 {
+	if out.Len() > 0 {
-		ob.WriteByte('\n')
+		out.WriteByte('\n')
 	}
 
 	if len(text) == 0 {
@@ -379,7 +379,7 @@ func htmlParagraph(ob *bytes.Buffer, text []byte, opaque interface{}) {
 		return
 	}
 
-	ob.WriteString("<p>")
+	out.WriteString("<p>")
 	if options.flags&HTML_HARD_WRAP != 0 {
 		for i < len(text) {
 			org := i
@@ -388,24 +388,24 @@ func htmlParagraph(ob *bytes.Buffer, text []byte, opaque interface{}) {
 			}
 
 			if i > org {
-				ob.Write(text[org:i])
+				out.Write(text[org:i])
 			}
 
 			if i >= len(text) {
 				break
 			}
 
-			ob.WriteString("<br>")
+			out.WriteString("<br>")
-			ob.WriteString(options.close_tag)
+			out.WriteString(options.close_tag)
 			i++
 		}
 	} else {
-		ob.Write(text[i:])
+		out.Write(text[i:])
 	}
-	ob.WriteString("</p>\n")
+	out.WriteString("</p>\n")
 }
 
-func htmlAutolink(ob *bytes.Buffer, link []byte, kind int, opaque interface{}) int {
+func htmlAutolink(out *bytes.Buffer, link []byte, kind int, opaque interface{}) int {
 	options := opaque.(*htmlOptions)
 
 	if len(link) == 0 {
@@ -415,12 +415,12 @@ func htmlAutolink(ob *bytes.Buffer, link []byte, kind int, opaque interface{}) i
 		return 0
 	}
 
-	ob.WriteString("<a href=\"")
+	out.WriteString("<a href=\"")
 	if kind == LINK_TYPE_EMAIL {
-		ob.WriteString("mailto:")
+		out.WriteString("mailto:")
 	}
-	ob.Write(link)
+	out.Write(link)
-	ob.WriteString("\">")
+	out.WriteString("\">")
 
 	/*
 	 * Pretty print: if we get an email address as
@@ -428,95 +428,95 @@ func htmlAutolink(ob *bytes.Buffer, link []byte, kind int, opaque interface{}) i
 	 * want to print the `mailto:` prefix
 	 */
 	if bytes.HasPrefix(link, []byte("mailto:")) {
-		attrEscape(ob, link[7:])
+		attrEscape(out, link[7:])
 	} else {
-		attrEscape(ob, link)
+		attrEscape(out, link)
 	}
 
-	ob.WriteString("</a>")
+	out.WriteString("</a>")
 
 	return 1
 }
 
-func htmlCodespan(ob *bytes.Buffer, text []byte, opaque interface{}) int {
+func htmlCodespan(out *bytes.Buffer, text []byte, opaque interface{}) int {
-	ob.WriteString("<code>")
+	out.WriteString("<code>")
-	attrEscape(ob, text)
+	attrEscape(out, text)
-	ob.WriteString("</code>")
+	out.WriteString("</code>")
 	return 1
 }
 
-func htmlDoubleEmphasis(ob *bytes.Buffer, text []byte, opaque interface{}) int {
+func htmlDoubleEmphasis(out *bytes.Buffer, text []byte, opaque interface{}) int {
 	if len(text) == 0 {
 		return 0
 	}
-	ob.WriteString("<strong>")
+	out.WriteString("<strong>")
-	ob.Write(text)
+	out.Write(text)
-	ob.WriteString("</strong>")
+	out.WriteString("</strong>")
 	return 1
 }
 
-func htmlEmphasis(ob *bytes.Buffer, text []byte, opaque interface{}) int {
+func htmlEmphasis(out *bytes.Buffer, text []byte, opaque interface{}) int {
 	if len(text) == 0 {
 		return 0
 	}
-	ob.WriteString("<em>")
+	out.WriteString("<em>")
-	ob.Write(text)
+	out.Write(text)
-	ob.WriteString("</em>")
+	out.WriteString("</em>")
 	return 1
 }
 
-func htmlImage(ob *bytes.Buffer, link []byte, title []byte, alt []byte, opaque interface{}) int {
+func htmlImage(out *bytes.Buffer, link []byte, title []byte, alt []byte, opaque interface{}) int {
 	options := opaque.(*htmlOptions)
 	if len(link) == 0 {
 		return 0
 	}
-	ob.WriteString("<img src=\"")
+	out.WriteString("<img src=\"")
-	attrEscape(ob, link)
+	attrEscape(out, link)
-	ob.WriteString("\" alt=\"")
+	out.WriteString("\" alt=\"")
 	if len(alt) > 0 {
-		attrEscape(ob, alt)
+		attrEscape(out, alt)
 	}
 	if len(title) > 0 {
-		ob.WriteString("\" title=\"")
+		out.WriteString("\" title=\"")
-		attrEscape(ob, title)
+		attrEscape(out, title)
 	}
 
-	ob.WriteByte('"')
+	out.WriteByte('"')
-	ob.WriteString(options.close_tag)
+	out.WriteString(options.close_tag)
 	return 1
 }
 
-func htmlLinebreak(ob *bytes.Buffer, opaque interface{}) int {
+func htmlLinebreak(out *bytes.Buffer, opaque interface{}) int {
 	options := opaque.(*htmlOptions)
-	ob.WriteString("<br")
+	out.WriteString("<br")
-	ob.WriteString(options.close_tag)
+	out.WriteString(options.close_tag)
 	return 1
 }
 
-func htmlLink(ob *bytes.Buffer, link []byte, title []byte, content []byte, opaque interface{}) int {
+func htmlLink(out *bytes.Buffer, link []byte, title []byte, content []byte, opaque interface{}) int {
 	options := opaque.(*htmlOptions)
 
 	if options.flags&HTML_SAFELINK != 0 && !isSafeLink(link) {
 		return 0
 	}
 
-	ob.WriteString("<a href=\"")
+	out.WriteString("<a href=\"")
 	if len(link) > 0 {
-		ob.Write(link)
+		out.Write(link)
 	}
 	if len(title) > 0 {
-		ob.WriteString("\" title=\"")
+		out.WriteString("\" title=\"")
-		attrEscape(ob, title)
+		attrEscape(out, title)
 	}
-	ob.WriteString("\">")
+	out.WriteString("\">")
 	if len(content) > 0 {
-		ob.Write(content)
+		out.Write(content)
 	}
-	ob.WriteString("</a>")
+	out.WriteString("</a>")
 	return 1
 }
 
-func htmlRawTag(ob *bytes.Buffer, text []byte, opaque interface{}) int {
+func htmlRawTag(out *bytes.Buffer, text []byte, opaque interface{}) int {
 	options := opaque.(*htmlOptions)
 	if options.flags&HTML_SKIP_HTML != 0 {
 		return 1
@@ -530,72 +530,72 @@ func htmlRawTag(ob *bytes.Buffer, text []byte, opaque interface{}) int {
 	if options.flags&HTML_SKIP_IMAGES != 0 && isHtmlTag(text, "img") {
 		return 1
 	}
-	ob.Write(text)
+	out.Write(text)
 	return 1
 }
 
-func htmlTripleEmphasis(ob *bytes.Buffer, text []byte, opaque interface{}) int {
+func htmlTripleEmphasis(out *bytes.Buffer, text []byte, opaque interface{}) int {
 	if len(text) == 0 {
 		return 0
 	}
-	ob.WriteString("<strong><em>")
+	out.WriteString("<strong><em>")
-	ob.Write(text)
+	out.Write(text)
-	ob.WriteString("</em></strong>")
+	out.WriteString("</em></strong>")
 	return 1
 }
 
-func htmlStrikethrough(ob *bytes.Buffer, text []byte, opaque interface{}) int {
+func htmlStrikethrough(out *bytes.Buffer, text []byte, opaque interface{}) int {
 	if len(text) == 0 {
 		return 0
 	}
-	ob.WriteString("<del>")
+	out.WriteString("<del>")
-	ob.Write(text)
+	out.Write(text)
-	ob.WriteString("</del>")
+	out.WriteString("</del>")
 	return 1
 }
 
-func htmlNormalText(ob *bytes.Buffer, text []byte, opaque interface{}) {
+func htmlNormalText(out *bytes.Buffer, text []byte, opaque interface{}) {
-	attrEscape(ob, text)
+	attrEscape(out, text)
 }
 
-func htmlTocHeader(ob *bytes.Buffer, text []byte, level int, opaque interface{}) {
+func htmlTocHeader(out *bytes.Buffer, text []byte, level int, opaque interface{}) {
 	options := opaque.(*htmlOptions)
 	for level > options.toc_data.current_level {
 		if options.toc_data.current_level > 0 {
-			ob.WriteString("<li>")
+			out.WriteString("<li>")
 		}
-		ob.WriteString("<ul>\n")
+		out.WriteString("<ul>\n")
 		options.toc_data.current_level++
 	}
 
 	for level < options.toc_data.current_level {
-		ob.WriteString("</ul>")
+		out.WriteString("</ul>")
 		if options.toc_data.current_level > 1 {
-			ob.WriteString("</li>\n")
+			out.WriteString("</li>\n")
 		}
 		options.toc_data.current_level--
 	}
 
-	ob.WriteString("<li><a href=\"#toc_")
+	out.WriteString("<li><a href=\"#toc_")
-	ob.WriteString(strconv.Itoa(options.toc_data.header_count))
+	out.WriteString(strconv.Itoa(options.toc_data.header_count))
-	ob.WriteString("\">")
+	out.WriteString("\">")
 	options.toc_data.header_count++
 
 	if len(text) > 0 {
-		ob.Write(text)
+		out.Write(text)
 	}
-	ob.WriteString("</a></li>\n")
+	out.WriteString("</a></li>\n")
 }
 
-func htmlTocFinalize(ob *bytes.Buffer, opaque interface{}) {
+func htmlTocFinalize(out *bytes.Buffer, opaque interface{}) {
 	options := opaque.(*htmlOptions)
 	for options.toc_data.current_level > 1 {
-		ob.WriteString("</ul></li>\n")
+		out.WriteString("</ul></li>\n")
 		options.toc_data.current_level--
 	}
 
 	if options.toc_data.current_level > 0 {
-		ob.WriteString("</ul>\n")
+		out.WriteString("</ul>\n")
 	}
 }
 

latex.go

@@ -0,0 +1,305 @@
+//
+// Black Friday Markdown Processor
+// Originally based on http://github.com/tanoku/upskirt
+// by Russ Ross <russ@russross.com>
+//
+
+//
+//
+// LaTeX rendering backend
+//
+//
+
+package blackfriday
+
+import (
+	"bytes"
+)
+
+func LatexRenderer(flags int) *Renderer {
+	// block-level rendering
+	r := new(Renderer)
+	r.blockcode = latexBlockcode
+	r.blockquote = latexBlockquote
+	//r.blockhtml = ?
+	r.header = latexHeader
+	r.hrule = latexHrule
+	r.list = latexList
+	r.listitem = latexListitem
+	r.paragraph = latexParagraph
+	r.table = latexTable
+	r.tableRow = latexTableRow
+	r.tableCell = latexTableCell
+
+	// inline rendering
+	r.autolink = latexAutolink
+	r.codespan = latexCodespan
+	r.doubleEmphasis = latexDoubleEmphasis
+	r.emphasis = latexEmphasis
+	r.image = latexImage
+	r.linebreak = latexLinebreak
+	r.link = latexLink
+	//r.rawHtmlTag = ?
+	r.strikethrough = latexStrikethrough
+
+	r.normalText = latexNormalText
+
+	r.documentHeader = latexDocumentHeader
+	r.documentFooter = latexDocumentFooter
+
+	r.opaque = nil
+	return r
+}
+
+// render code chunks using verbatim, or listings if we have a language
+func latexBlockcode(out *bytes.Buffer, text []byte, lang string, opaque interface{}) {
+	if lang == "" {
+		out.WriteString("\n\\begin{verbatim}\n")
+	} else {
+		out.WriteString("\n\\begin{lstlisting}[language=")
+		out.WriteString(lang)
+		out.WriteString("]\n")
+	}
+	out.Write(text)
+	if lang == "" {
+		out.WriteString("\n\\end{verbatim}\n")
+	} else {
+		out.WriteString("\n\\end{lstlisting}\n")
+	}
+}
+
+func latexBlockquote(out *bytes.Buffer, text []byte, opaque interface{}) {
+	out.WriteString("\n\\begin{quotation}\n")
+	out.Write(text)
+	out.WriteString("\n\\end{quotation}\n")
+}
+
+//blockhtml  func(out *bytes.Buffer, text []byte, opaque interface{})
+
+func latexHeader(out *bytes.Buffer, text []byte, level int, opaque interface{}) {
+	switch level {
+	case 1:
+		out.WriteString("\n\\section{")
+	case 2:
+		out.WriteString("\n\\subsection{")
+	case 3:
+		out.WriteString("\n\\subsubsection{")
+	case 4:
+		out.WriteString("\n\\paragraph{")
+	case 5:
+		out.WriteString("\n\\subparagraph{")
+	case 6:
+		out.WriteString("\n\\textbf{")
+	}
+	out.Write(text)
+	out.WriteString("}\n")
+}
+
+func latexHrule(out *bytes.Buffer, opaque interface{}) {
+	out.WriteString("\n\\HRule\n")
+}
+
+func latexList(out *bytes.Buffer, text []byte, flags int, opaque interface{}) {
+	if flags&LIST_TYPE_ORDERED != 0 {
+		out.WriteString("\n\\begin{enumerate}\n")
+	} else {
+		out.WriteString("\n\\begin{itemize}\n")
+	}
+	out.Write(text)
+	if flags&LIST_TYPE_ORDERED != 0 {
+		out.WriteString("\n\\end{enumerate}\n")
+	} else {
+		out.WriteString("\n\\end{itemize}\n")
+	}
+}
+
+func latexListitem(out *bytes.Buffer, text []byte, flags int, opaque interface{}) {
+	out.WriteString("\n\\item ")
+	out.Write(text)
+}
+
+func latexParagraph(out *bytes.Buffer, text []byte, opaque interface{}) {
+	out.WriteString("\n")
+	out.Write(text)
+	out.WriteString("\n")
+}
+
+func latexTable(out *bytes.Buffer, header []byte, body []byte, columnData []int, opaque interface{}) {
+	out.WriteString("\n\\begin{tabular}{")
+	for _, elt := range columnData {
+		switch elt {
+		case TABLE_ALIGNMENT_LEFT:
+			out.WriteByte('l')
+		case TABLE_ALIGNMENT_RIGHT:
+			out.WriteByte('r')
+		default:
+			out.WriteByte('c')
+		}
+	}
+	out.WriteString("}\n")
+	out.Write(header)
+	out.WriteString(" \\\\\n\\hline\n")
+	out.Write(body)
+	out.WriteString("\n\\end{tabular}\n")
+}
+
+func latexTableRow(out *bytes.Buffer, text []byte, opaque interface{}) {
+	if out.Len() > 0 {
+		out.WriteString(" \\\\\n")
+	}
+	out.Write(text)
+}
+
+func latexTableCell(out *bytes.Buffer, text []byte, align int, opaque interface{}) {
+	if out.Len() > 0 {
+		out.WriteString(" & ")
+	}
+	out.Write(text)
+}
+
+func latexAutolink(out *bytes.Buffer, link []byte, kind int, opaque interface{}) int {
+	out.WriteString("\\href{")
+	if kind == LINK_TYPE_EMAIL {
+		out.WriteString("mailto:")
+	}
+	out.Write(link)
+	out.WriteString("}{")
+	out.Write(link)
+	out.WriteString("}")
+	return 1
+}
+
+func latexCodespan(out *bytes.Buffer, text []byte, opaque interface{}) int {
+	out.WriteString("\\texttt{")
+	escapeSpecialChars(out, text)
+	out.WriteString("}")
+	return 1
+}
+
+func latexDoubleEmphasis(out *bytes.Buffer, text []byte, opaque interface{}) int {
+	out.WriteString("\\textbf{")
+	out.Write(text)
+	out.WriteString("}")
+	return 1
+}
+
+func latexEmphasis(out *bytes.Buffer, text []byte, opaque interface{}) int {
+	out.WriteString("\\textit{")
+	out.Write(text)
+	out.WriteString("}")
+	return 1
+}
+
+func latexImage(out *bytes.Buffer, link []byte, title []byte, alt []byte, opaque interface{}) int {
+	if bytes.HasPrefix(link, []byte("http://")) || bytes.HasPrefix(link, []byte("https://")) {
+		// treat it like a link
+		out.WriteString("\\href{")
+		out.Write(link)
+		out.WriteString("}{")
+		out.Write(alt)
+		out.WriteString("}")
+	} else {
+		out.WriteString("\\includegraphics{")
+		out.Write(link)
+		out.WriteString("}")
+	}
+	return 1
+}
+
+func latexLinebreak(out *bytes.Buffer, opaque interface{}) int {
+	out.WriteString(" \\\\\n")
+	return 1
+}
+
+func latexLink(out *bytes.Buffer, link []byte, title []byte, content []byte, opaque interface{}) int {
+	out.WriteString("\\href{")
+	out.Write(link)
+	out.WriteString("}{")
+	out.Write(content)
+	out.WriteString("}")
+	return 1
+}
+
+func latexRawHtmlTag(out *bytes.Buffer, tag []byte, opaque interface{}) int {
+	return 0
+}
+
+func latexTripleEmphasis(out *bytes.Buffer, text []byte, opaque interface{}) int {
+	out.WriteString("\\textbf{\\textit{")
+	out.Write(text)
+	out.WriteString("}}")
+	return 1
+}
+
+func latexStrikethrough(out *bytes.Buffer, text []byte, opaque interface{}) int {
+	out.WriteString("\\sout{")
+	out.Write(text)
+	out.WriteString("}")
+	return 1
+}
+
+func needsBackslash(c byte) bool {
+	for _, r := range []byte("_{}%$&\\~") {
+		if c == r {
+			return true
+		}
+	}
+	return false
+}
+
+func escapeSpecialChars(out *bytes.Buffer, text []byte) {
+	for i := 0; i < len(text); i++ {
+		// directly copy normal characters
+		org := i
+
+		for i < len(text) && !needsBackslash(text[i]) {
+			i++
+		}
+		if i > org {
+			out.Write(text[org:i])
+		}
+
+		// escape a character
+		if i >= len(text) {
+			break
+		}
+		out.WriteByte('\\')
+		out.WriteByte(text[i])
+	}
+}
+
+func latexNormalText(out *bytes.Buffer, text []byte, opaque interface{}) {
+	escapeSpecialChars(out, text)
+}
+
+// header and footer
+func latexDocumentHeader(out *bytes.Buffer, opaque interface{}) {
+	out.WriteString("\\documentclass{article}\n")
+	out.WriteString("\n")
+	out.WriteString("\\usepackage{graphicx}\n")
+	out.WriteString("\\usepackage{listings}\n")
+	out.WriteString("\\usepackage[margin=1in]{geometry}\n")
+	out.WriteString("\\usepackage[utf8]{inputenc}\n")
+	out.WriteString("\\usepackage{verbatim}\n")
+	out.WriteString("\\usepackage[normalem]{ulem}\n")
+	out.WriteString("\\usepackage{hyperref}\n")
+	out.WriteString("\n")
+	out.WriteString("\\hypersetup{colorlinks,%\n")
+	out.WriteString("  citecolor=black,%\n")
+	out.WriteString("  filecolor=black,%\n")
+	out.WriteString("  linkcolor=black,%\n")
+	out.WriteString("  urlcolor=black,%\n")
+	out.WriteString("  pdfstartview=FitH,%\n")
+	out.WriteString("  breaklinks=true,%\n")
+	out.WriteString("  pdfauthor={Black Friday Markdown Processor}}\n")
+	out.WriteString("\n")
+	out.WriteString("\\newcommand{\\HRule}{\\rule{\\linewidth}{0.5mm}}\n")
+	out.WriteString("\\addtolength{\\parskip}{0.5\\baselineskip}\n")
+	out.WriteString("\\parindent=0pt\n")
+	out.WriteString("\n")
+	out.WriteString("\\begin{document}\n")
+}
+
+func latexDocumentFooter(out *bytes.Buffer, opaque interface{}) {
+	out.WriteString("\n\\end{document}\n")
+}

markdown.go

@@ -104,7 +104,7 @@ type Renderer struct {
 	list       func(out *bytes.Buffer, text []byte, flags int, opaque interface{})
 	listitem   func(out *bytes.Buffer, text []byte, flags int, opaque interface{})
 	paragraph  func(out *bytes.Buffer, text []byte, opaque interface{})
-	table      func(out *bytes.Buffer, header []byte, body []byte, opaque interface{})
+	table      func(out *bytes.Buffer, header []byte, body []byte, columnData []int, opaque interface{})
 	tableRow   func(out *bytes.Buffer, text []byte, opaque interface{})
 	tableCell  func(out *bytes.Buffer, text []byte, flags int, opaque interface{})