mirror of
https://github.com/danog/blackfriday.git
synced 2024-11-30 04:29:13 +01:00
rudimentary latex backend, additional cleanup
This commit is contained in:
Russ Ross
parent
81cefb5e7c
commit
ee3fe99203
4
Makefile
4
Makefile
@ -2,7 +2,9 @@ include $(GOROOT)/src/Make.inc
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TARG=github.com/russross/blackfriday
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GOFILES=markdown.go block.go inline.go html.go smartypants.go
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GOFILES=markdown.go block.go inline.go html.go smartypants.go latex.go
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all: package markdown
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include $(GOROOT)/src/Make.pkg
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16
README.md
16
README.md
@ -79,12 +79,26 @@ implements two additional Smartypants options:
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cases). For example, `4/5` becomes `<sup>4</sup>⁄<sub>5</sub>`
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LaTeX Output
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------------
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A rudimentary LaTeX rendering backend is also included. To see an
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example of its usage, comment out this link in `main.go`:
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renderer := blackfriday.HtmlRenderer(html_flags)
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and uncomment this line:
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renderer := blackfriday.LatexRenderer(0)
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It renders some basic documents, but is only experimental at this point.
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Todo
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----
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* Code cleanup
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* Better code documentation
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* Implement a LaTeX backend
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[1]: http://daringfireball.net/projects/markdown/ "Markdown"
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2
block.go
2
block.go
@ -514,7 +514,7 @@ func blockTable(out *bytes.Buffer, rndr *render, data []byte) int {
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}
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if rndr.mk.table != nil {
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rndr.mk.table(out, header_work.Bytes(), body_work.Bytes(), rndr.mk.opaque)
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rndr.mk.table(out, header_work.Bytes(), body_work.Bytes(), col_data, rndr.mk.opaque)
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}
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}
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@ -4,8 +4,9 @@ TARG=markdown
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GOFILES=main.go
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LIBBF=github.com/russross/blackfriday
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markdown: ../_obj/github.com/russross/blackfriday.a
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PREREQ += ../_obj/$(LIBBF).a
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GC += -I../_obj/
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LD += -L../_obj/
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include $(GOROOT)/src/Make.cmd
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@ -57,8 +57,13 @@ func main() {
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html_flags |= blackfriday.HTML_SMARTYPANTS_FRACTIONS
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html_flags |= blackfriday.HTML_SMARTYPANTS_LATEX_DASHES
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// render the data
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output := blackfriday.Markdown(input, blackfriday.HtmlRenderer(html_flags), extensions)
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// render the data into HTML (comment this out to deselect HTML)
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renderer := blackfriday.HtmlRenderer(html_flags)
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// render the data into LaTeX (uncomment to select LaTeX)
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//renderer := blackfriday.LatexRenderer(0)
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output := blackfriday.Markdown(input, renderer, extensions)
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// output the result
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if len(os.Args) == 3 {
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316
html.go
316
html.go
@ -65,8 +65,8 @@ func HtmlRenderer(flags int) *Renderer {
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r.listitem = htmlListitem
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r.paragraph = htmlParagraph
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r.table = htmlTable
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r.tableRow = htmlTablerow
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r.tableCell = htmlTablecell
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r.tableRow = htmlTableRow
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r.tableCell = htmlTableCell
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r.autolink = htmlAutolink
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r.codespan = htmlCodespan
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@ -120,7 +120,7 @@ func HtmlTocRenderer(flags int) *Renderer {
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return r
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}
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func attrEscape(ob *bytes.Buffer, src []byte) {
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func attrEscape(out *bytes.Buffer, src []byte) {
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for i := 0; i < len(src); i++ {
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// directly copy normal characters
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org := i
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@ -128,7 +128,7 @@ func attrEscape(ob *bytes.Buffer, src []byte) {
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i++
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}
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if i > org {
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ob.Write(src[org:i])
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out.Write(src[org:i])
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}
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// escape a character
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@ -137,36 +137,36 @@ func attrEscape(ob *bytes.Buffer, src []byte) {
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}
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switch src[i] {
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case '<':
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ob.WriteString("<")
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out.WriteString("<")
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case '>':
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ob.WriteString(">")
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out.WriteString(">")
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case '&':
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ob.WriteString("&")
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out.WriteString("&")
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case '"':
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ob.WriteString(""")
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out.WriteString(""")
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}
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}
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}
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func htmlHeader(ob *bytes.Buffer, text []byte, level int, opaque interface{}) {
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func htmlHeader(out *bytes.Buffer, text []byte, level int, opaque interface{}) {
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options := opaque.(*htmlOptions)
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if ob.Len() > 0 {
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ob.WriteByte('\n')
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if out.Len() > 0 {
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out.WriteByte('\n')
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}
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if options.flags&HTML_TOC != 0 {
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ob.WriteString(fmt.Sprintf("<h%d id=\"toc_%d\">", level, options.toc_data.header_count))
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out.WriteString(fmt.Sprintf("<h%d id=\"toc_%d\">", level, options.toc_data.header_count))
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options.toc_data.header_count++
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} else {
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ob.WriteString(fmt.Sprintf("<h%d>", level))
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out.WriteString(fmt.Sprintf("<h%d>", level))
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}
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ob.Write(text)
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ob.WriteString(fmt.Sprintf("</h%d>\n", level))
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out.Write(text)
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out.WriteString(fmt.Sprintf("</h%d>\n", level))
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}
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func htmlRawBlock(ob *bytes.Buffer, text []byte, opaque interface{}) {
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func htmlRawBlock(out *bytes.Buffer, text []byte, opaque interface{}) {
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sz := len(text)
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for sz > 0 && text[sz-1] == '\n' {
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sz--
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@ -178,30 +178,30 @@ func htmlRawBlock(ob *bytes.Buffer, text []byte, opaque interface{}) {
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if org >= sz {
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return
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}
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if ob.Len() > 0 {
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ob.WriteByte('\n')
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if out.Len() > 0 {
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out.WriteByte('\n')
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}
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ob.Write(text[org:sz])
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ob.WriteByte('\n')
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out.Write(text[org:sz])
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out.WriteByte('\n')
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}
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func htmlHrule(ob *bytes.Buffer, opaque interface{}) {
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func htmlHrule(out *bytes.Buffer, opaque interface{}) {
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options := opaque.(*htmlOptions)
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if ob.Len() > 0 {
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ob.WriteByte('\n')
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if out.Len() > 0 {
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out.WriteByte('\n')
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}
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ob.WriteString("<hr")
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ob.WriteString(options.close_tag)
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out.WriteString("<hr")
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out.WriteString(options.close_tag)
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}
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func htmlBlockcode(ob *bytes.Buffer, text []byte, lang string, opaque interface{}) {
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if ob.Len() > 0 {
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ob.WriteByte('\n')
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func htmlBlockcode(out *bytes.Buffer, text []byte, lang string, opaque interface{}) {
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if out.Len() > 0 {
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out.WriteByte('\n')
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}
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if lang != "" {
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ob.WriteString("<pre><code class=\"")
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out.WriteString("<pre><code class=\"")
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for i, cls := 0, 0; i < len(lang); i, cls = i+1, cls+1 {
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for i < len(lang) && isspace(lang[i]) {
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@ -219,22 +219,22 @@ func htmlBlockcode(ob *bytes.Buffer, text []byte, lang string, opaque interface{
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}
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if cls > 0 {
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ob.WriteByte(' ')
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out.WriteByte(' ')
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}
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attrEscape(ob, []byte(lang[org:]))
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attrEscape(out, []byte(lang[org:]))
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}
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}
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ob.WriteString("\">")
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out.WriteString("\">")
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} else {
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ob.WriteString("<pre><code>")
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out.WriteString("<pre><code>")
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}
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if len(text) > 0 {
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attrEscape(ob, text)
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attrEscape(out, text)
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}
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ob.WriteString("</code></pre>\n")
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out.WriteString("</code></pre>\n")
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}
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/*
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@ -255,13 +255,13 @@ func htmlBlockcode(ob *bytes.Buffer, text []byte, lang string, opaque interface{
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* E.g.
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* ~~~~ {.python .numbered} => <pre lang="python"><code>
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*/
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func htmlBlockcodeGithub(ob *bytes.Buffer, text []byte, lang string, opaque interface{}) {
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if ob.Len() > 0 {
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ob.WriteByte('\n')
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func htmlBlockcodeGithub(out *bytes.Buffer, text []byte, lang string, opaque interface{}) {
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if out.Len() > 0 {
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out.WriteByte('\n')
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}
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if len(lang) > 0 {
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ob.WriteString("<pre lang=\"")
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out.WriteString("<pre lang=\"")
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i := 0
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for i < len(lang) && !isspace(lang[i]) {
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@ -269,102 +269,102 @@ func htmlBlockcodeGithub(ob *bytes.Buffer, text []byte, lang string, opaque inte
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}
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if lang[0] == '.' {
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attrEscape(ob, []byte(lang[1:i]))
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attrEscape(out, []byte(lang[1:i]))
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} else {
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attrEscape(ob, []byte(lang[:i]))
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attrEscape(out, []byte(lang[:i]))
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}
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ob.WriteString("\"><code>")
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out.WriteString("\"><code>")
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} else {
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ob.WriteString("<pre><code>")
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out.WriteString("<pre><code>")
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}
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if len(text) > 0 {
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attrEscape(ob, text)
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attrEscape(out, text)
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}
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ob.WriteString("</code></pre>\n")
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out.WriteString("</code></pre>\n")
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}
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func htmlBlockquote(ob *bytes.Buffer, text []byte, opaque interface{}) {
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ob.WriteString("<blockquote>\n")
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ob.Write(text)
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ob.WriteString("</blockquote>")
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func htmlBlockquote(out *bytes.Buffer, text []byte, opaque interface{}) {
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out.WriteString("<blockquote>\n")
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out.Write(text)
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out.WriteString("</blockquote>")
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}
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func htmlTable(ob *bytes.Buffer, header []byte, body []byte, opaque interface{}) {
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if ob.Len() > 0 {
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ob.WriteByte('\n')
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func htmlTable(out *bytes.Buffer, header []byte, body []byte, columnData []int, opaque interface{}) {
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if out.Len() > 0 {
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out.WriteByte('\n')
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}
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ob.WriteString("<table><thead>\n")
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ob.Write(header)
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ob.WriteString("\n</thead><tbody>\n")
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ob.Write(body)
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ob.WriteString("\n</tbody></table>")
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out.WriteString("<table><thead>\n")
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out.Write(header)
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out.WriteString("\n</thead><tbody>\n")
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out.Write(body)
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out.WriteString("\n</tbody></table>")
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}
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func htmlTablerow(ob *bytes.Buffer, text []byte, opaque interface{}) {
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if ob.Len() > 0 {
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ob.WriteByte('\n')
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func htmlTableRow(out *bytes.Buffer, text []byte, opaque interface{}) {
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if out.Len() > 0 {
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out.WriteByte('\n')
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}
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ob.WriteString("<tr>\n")
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ob.Write(text)
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ob.WriteString("\n</tr>")
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out.WriteString("<tr>\n")
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out.Write(text)
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out.WriteString("\n</tr>")
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}
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func htmlTablecell(ob *bytes.Buffer, text []byte, align int, opaque interface{}) {
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if ob.Len() > 0 {
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ob.WriteByte('\n')
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func htmlTableCell(out *bytes.Buffer, text []byte, align int, opaque interface{}) {
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if out.Len() > 0 {
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out.WriteByte('\n')
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}
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switch align {
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case TABLE_ALIGNMENT_LEFT:
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ob.WriteString("<td align=\"left\">")
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out.WriteString("<td align=\"left\">")
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case TABLE_ALIGNMENT_RIGHT:
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ob.WriteString("<td align=\"right\">")
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out.WriteString("<td align=\"right\">")
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case TABLE_ALIGNMENT_CENTER:
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ob.WriteString("<td align=\"center\">")
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out.WriteString("<td align=\"center\">")
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default:
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ob.WriteString("<td>")
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out.WriteString("<td>")
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}
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ob.Write(text)
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ob.WriteString("</td>")
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out.Write(text)
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out.WriteString("</td>")
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}
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func htmlList(ob *bytes.Buffer, text []byte, flags int, opaque interface{}) {
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if ob.Len() > 0 {
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ob.WriteByte('\n')
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func htmlList(out *bytes.Buffer, text []byte, flags int, opaque interface{}) {
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if out.Len() > 0 {
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out.WriteByte('\n')
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}
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if flags&LIST_TYPE_ORDERED != 0 {
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ob.WriteString("<ol>\n")
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out.WriteString("<ol>\n")
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} else {
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ob.WriteString("<ul>\n")
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out.WriteString("<ul>\n")
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}
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ob.Write(text)
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out.Write(text)
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if flags&LIST_TYPE_ORDERED != 0 {
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ob.WriteString("</ol>\n")
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out.WriteString("</ol>\n")
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} else {
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ob.WriteString("</ul>\n")
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out.WriteString("</ul>\n")
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}
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}
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func htmlListitem(ob *bytes.Buffer, text []byte, flags int, opaque interface{}) {
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ob.WriteString("<li>")
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func htmlListitem(out *bytes.Buffer, text []byte, flags int, opaque interface{}) {
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out.WriteString("<li>")
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size := len(text)
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for size > 0 && text[size-1] == '\n' {
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size--
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}
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ob.Write(text[:size])
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ob.WriteString("</li>\n")
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out.Write(text[:size])
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out.WriteString("</li>\n")
|
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}
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func htmlParagraph(ob *bytes.Buffer, text []byte, opaque interface{}) {
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func htmlParagraph(out *bytes.Buffer, text []byte, opaque interface{}) {
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options := opaque.(*htmlOptions)
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i := 0
|
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|
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if ob.Len() > 0 {
|
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ob.WriteByte('\n')
|
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if out.Len() > 0 {
|
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out.WriteByte('\n')
|
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}
|
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|
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if len(text) == 0 {
|
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@ -379,7 +379,7 @@ func htmlParagraph(ob *bytes.Buffer, text []byte, opaque interface{}) {
|
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return
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}
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|
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ob.WriteString("<p>")
|
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out.WriteString("<p>")
|
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if options.flags&HTML_HARD_WRAP != 0 {
|
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for i < len(text) {
|
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org := i
|
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@ -388,24 +388,24 @@ func htmlParagraph(ob *bytes.Buffer, text []byte, opaque interface{}) {
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}
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|
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if i > org {
|
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ob.Write(text[org:i])
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out.Write(text[org:i])
|
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}
|
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|
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if i >= len(text) {
|
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break
|
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}
|
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|
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ob.WriteString("<br>")
|
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ob.WriteString(options.close_tag)
|
||||
out.WriteString("<br>")
|
||||
out.WriteString(options.close_tag)
|
||||
i++
|
||||
}
|
||||
} else {
|
||||
ob.Write(text[i:])
|
||||
out.Write(text[i:])
|
||||
}
|
||||
ob.WriteString("</p>\n")
|
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out.WriteString("</p>\n")
|
||||
}
|
||||
|
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func htmlAutolink(ob *bytes.Buffer, link []byte, kind int, opaque interface{}) int {
|
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func htmlAutolink(out *bytes.Buffer, link []byte, kind int, opaque interface{}) int {
|
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options := opaque.(*htmlOptions)
|
||||
|
||||
if len(link) == 0 {
|
||||
@ -415,12 +415,12 @@ func htmlAutolink(ob *bytes.Buffer, link []byte, kind int, opaque interface{}) i
|
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return 0
|
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}
|
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|
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ob.WriteString("<a href=\"")
|
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out.WriteString("<a href=\"")
|
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if kind == LINK_TYPE_EMAIL {
|
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ob.WriteString("mailto:")
|
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out.WriteString("mailto:")
|
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}
|
||||
ob.Write(link)
|
||||
ob.WriteString("\">")
|
||||
out.Write(link)
|
||||
out.WriteString("\">")
|
||||
|
||||
/*
|
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* Pretty print: if we get an email address as
|
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@ -428,95 +428,95 @@ func htmlAutolink(ob *bytes.Buffer, link []byte, kind int, opaque interface{}) i
|
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* want to print the `mailto:` prefix
|
||||
*/
|
||||
if bytes.HasPrefix(link, []byte("mailto:")) {
|
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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 {
|
||||
ob.WriteString("<code>")
|
||||
attrEscape(ob, text)
|
||||
ob.WriteString("</code>")
|
||||
func htmlCodespan(out *bytes.Buffer, text []byte, opaque interface{}) int {
|
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out.WriteString("<code>")
|
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attrEscape(out, text)
|
||||
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>")
|
||||
ob.Write(text)
|
||||
ob.WriteString("</strong>")
|
||||
out.WriteString("<strong>")
|
||||
out.Write(text)
|
||||
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>")
|
||||
ob.Write(text)
|
||||
ob.WriteString("</em>")
|
||||
out.WriteString("<em>")
|
||||
out.Write(text)
|
||||
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=\"")
|
||||
attrEscape(ob, link)
|
||||
ob.WriteString("\" alt=\"")
|
||||
out.WriteString("<img src=\"")
|
||||
attrEscape(out, link)
|
||||
out.WriteString("\" alt=\"")
|
||||
if len(alt) > 0 {
|
||||
attrEscape(ob, alt)
|
||||
attrEscape(out, alt)
|
||||
}
|
||||
if len(title) > 0 {
|
||||
ob.WriteString("\" title=\"")
|
||||
attrEscape(ob, title)
|
||||
out.WriteString("\" title=\"")
|
||||
attrEscape(out, title)
|
||||
}
|
||||
|
||||
ob.WriteByte('"')
|
||||
ob.WriteString(options.close_tag)
|
||||
out.WriteByte('"')
|
||||
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")
|
||||
ob.WriteString(options.close_tag)
|
||||
out.WriteString("<br")
|
||||
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=\"")
|
||||
attrEscape(ob, title)
|
||||
out.WriteString("\" 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>")
|
||||
ob.Write(text)
|
||||
ob.WriteString("</em></strong>")
|
||||
out.WriteString("<strong><em>")
|
||||
out.Write(text)
|
||||
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>")
|
||||
ob.Write(text)
|
||||
ob.WriteString("</del>")
|
||||
out.WriteString("<del>")
|
||||
out.Write(text)
|
||||
out.WriteString("</del>")
|
||||
return 1
|
||||
}
|
||||
|
||||
func htmlNormalText(ob *bytes.Buffer, text []byte, opaque interface{}) {
|
||||
attrEscape(ob, text)
|
||||
func htmlNormalText(out *bytes.Buffer, text []byte, opaque interface{}) {
|
||||
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_")
|
||||
ob.WriteString(strconv.Itoa(options.toc_data.header_count))
|
||||
ob.WriteString("\">")
|
||||
out.WriteString("<li><a href=\"#toc_")
|
||||
out.WriteString(strconv.Itoa(options.toc_data.header_count))
|
||||
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")
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
305
latex.go
Normal file
305
latex.go
Normal file
@ -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")
|
||||
}
|
||||
@ -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{})
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user