844 lines
21 KiB
Go
844 lines
21 KiB
Go
//
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// Blackfriday Markdown Processor
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// Available at http://github.com/russross/blackfriday
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//
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// Copyright © 2011 Russ Ross <russ@russross.com>.
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// Distributed under the Simplified BSD License.
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// See README.md for details.
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//
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//
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//
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// HTML rendering backend
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//
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//
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package blackfriday
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import (
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"bytes"
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"fmt"
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"html"
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"io"
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"regexp"
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"strings"
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)
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// HTMLFlags control optional behavior of HTML renderer.
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type HTMLFlags int
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// HTML renderer configuration options.
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const (
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HTMLFlagsNone HTMLFlags = 0
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SkipHTML HTMLFlags = 1 << iota // Skip preformatted HTML blocks
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SkipStyle // Skip embedded <style> elements
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SkipImages // Skip embedded images
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SkipLinks // Skip all links
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Safelink // Only link to trusted protocols
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NofollowLinks // Only link with rel="nofollow"
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NoreferrerLinks // Only link with rel="noreferrer"
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HrefTargetBlank // Add a blank target
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CompletePage // Generate a complete HTML page
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UseXHTML // Generate XHTML output instead of HTML
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FootnoteReturnLinks // Generate a link at the end of a footnote to return to the source
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Smartypants // Enable smart punctuation substitutions
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SmartypantsFractions // Enable smart fractions (with Smartypants)
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SmartypantsDashes // Enable smart dashes (with Smartypants)
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SmartypantsLatexDashes // Enable LaTeX-style dashes (with Smartypants)
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SmartypantsAngledQuotes // Enable angled double quotes (with Smartypants) for double quotes rendering
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TagName = "[A-Za-z][A-Za-z0-9-]*"
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AttributeName = "[a-zA-Z_:][a-zA-Z0-9:._-]*"
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UnquotedValue = "[^\"'=<>`\\x00-\\x20]+"
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SingleQuotedValue = "'[^']*'"
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DoubleQuotedValue = "\"[^\"]*\""
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AttributeValue = "(?:" + UnquotedValue + "|" + SingleQuotedValue + "|" + DoubleQuotedValue + ")"
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AttributeValueSpec = "(?:" + "\\s*=" + "\\s*" + AttributeValue + ")"
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Attribute = "(?:" + "\\s+" + AttributeName + AttributeValueSpec + "?)"
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OpenTag = "<" + TagName + Attribute + "*" + "\\s*/?>"
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CloseTag = "</" + TagName + "\\s*[>]"
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HTMLComment = "<!---->|<!--(?:-?[^>-])(?:-?[^-])*-->"
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ProcessingInstruction = "[<][?].*?[?][>]"
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Declaration = "<![A-Z]+" + "\\s+[^>]*>"
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CDATA = "<!\\[CDATA\\[[\\s\\S]*?\\]\\]>"
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HTMLTag = "(?:" + OpenTag + "|" + CloseTag + "|" + HTMLComment + "|" +
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ProcessingInstruction + "|" + Declaration + "|" + CDATA + ")"
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)
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var (
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htmlTagRe = regexp.MustCompile("(?i)^" + HTMLTag)
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)
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// HTMLRendererParameters is a collection of supplementary parameters tweaking
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// the behavior of various parts of HTML renderer.
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type HTMLRendererParameters struct {
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// Prepend this text to each relative URL.
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AbsolutePrefix string
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// Add this text to each footnote anchor, to ensure uniqueness.
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FootnoteAnchorPrefix string
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// Show this text inside the <a> tag for a footnote return link, if the
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// HTML_FOOTNOTE_RETURN_LINKS flag is enabled. If blank, the string
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// <sup>[return]</sup> is used.
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FootnoteReturnLinkContents string
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// If set, add this text to the front of each Header ID, to ensure
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// uniqueness.
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HeaderIDPrefix string
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// If set, add this text to the back of each Header ID, to ensure uniqueness.
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HeaderIDSuffix string
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Title string // Document title (used if CompletePage is set)
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CSS string // Optional CSS file URL (used if CompletePage is set)
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Icon string // Optional icon file URL (used if CompletePage is set)
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Flags HTMLFlags // Flags allow customizing this renderer's behavior
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Extensions Extensions // Extensions give Smartypants and HTML renderer access to Blackfriday's global extensions
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}
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// HTMLRenderer is a type that implements the Renderer interface for HTML output.
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//
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// Do not create this directly, instead use the NewHTMLRenderer function.
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type HTMLRenderer struct {
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HTMLRendererParameters
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closeTag string // how to end singleton tags: either " />" or ">"
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// Track header IDs to prevent ID collision in a single generation.
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headerIDs map[string]int
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lastOutputLen int
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disableTags int
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sr *SPRenderer
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}
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const (
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xhtmlClose = " />"
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htmlClose = ">"
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)
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// NewHTMLRenderer creates and configures an HTMLRenderer object, which
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// satisfies the Renderer interface.
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func NewHTMLRenderer(params HTMLRendererParameters) *HTMLRenderer {
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// configure the rendering engine
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closeTag := htmlClose
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if params.Flags&UseXHTML != 0 {
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closeTag = xhtmlClose
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}
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if params.FootnoteReturnLinkContents == "" {
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params.FootnoteReturnLinkContents = `<sup>[return]</sup>`
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}
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return &HTMLRenderer{
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HTMLRendererParameters: params,
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closeTag: closeTag,
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headerIDs: make(map[string]int),
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sr: NewSmartypantsRenderer(params.Flags),
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}
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}
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func isHTMLTag(tag []byte, tagname string) bool {
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found, _ := findHTMLTagPos(tag, tagname)
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return found
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}
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// Look for a character, but ignore it when it's in any kind of quotes, it
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// might be JavaScript
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func skipUntilCharIgnoreQuotes(html []byte, start int, char byte) int {
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inSingleQuote := false
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inDoubleQuote := false
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inGraveQuote := false
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i := start
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for i < len(html) {
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switch {
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case html[i] == char && !inSingleQuote && !inDoubleQuote && !inGraveQuote:
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return i
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case html[i] == '\'':
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inSingleQuote = !inSingleQuote
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case html[i] == '"':
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inDoubleQuote = !inDoubleQuote
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case html[i] == '`':
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inGraveQuote = !inGraveQuote
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}
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i++
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}
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return start
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}
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func findHTMLTagPos(tag []byte, tagname string) (bool, int) {
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i := 0
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if i < len(tag) && tag[0] != '<' {
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return false, -1
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}
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i++
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i = skipSpace(tag, i)
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if i < len(tag) && tag[i] == '/' {
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i++
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}
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i = skipSpace(tag, i)
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j := 0
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for ; i < len(tag); i, j = i+1, j+1 {
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if j >= len(tagname) {
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break
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}
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if strings.ToLower(string(tag[i]))[0] != tagname[j] {
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return false, -1
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}
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}
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if i == len(tag) {
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return false, -1
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}
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rightAngle := skipUntilCharIgnoreQuotes(tag, i, '>')
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if rightAngle >= i {
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return true, rightAngle
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}
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return false, -1
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}
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func skipSpace(tag []byte, i int) int {
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for i < len(tag) && isspace(tag[i]) {
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i++
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}
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return i
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}
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func isRelativeLink(link []byte) (yes bool) {
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// a tag begin with '#'
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if link[0] == '#' {
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return true
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}
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// link begin with '/' but not '//', the second maybe a protocol relative link
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if len(link) >= 2 && link[0] == '/' && link[1] != '/' {
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return true
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}
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// only the root '/'
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if len(link) == 1 && link[0] == '/' {
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return true
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}
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// current directory : begin with "./"
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if bytes.HasPrefix(link, []byte("./")) {
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return true
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}
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// parent directory : begin with "../"
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if bytes.HasPrefix(link, []byte("../")) {
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return true
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}
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return false
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}
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func (r *HTMLRenderer) ensureUniqueHeaderID(id string) string {
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for count, found := r.headerIDs[id]; found; count, found = r.headerIDs[id] {
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tmp := fmt.Sprintf("%s-%d", id, count+1)
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if _, tmpFound := r.headerIDs[tmp]; !tmpFound {
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r.headerIDs[id] = count + 1
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id = tmp
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} else {
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id = id + "-1"
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}
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}
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if _, found := r.headerIDs[id]; !found {
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r.headerIDs[id] = 0
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}
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return id
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}
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func (r *HTMLRenderer) addAbsPrefix(link []byte) []byte {
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if r.AbsolutePrefix != "" && isRelativeLink(link) && link[0] != '.' {
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newDest := r.AbsolutePrefix
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if link[0] != '/' {
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newDest += "/"
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}
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newDest += string(link)
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return []byte(newDest)
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}
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return link
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}
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func appendLinkAttrs(attrs []string, flags HTMLFlags, link []byte) []string {
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if isRelativeLink(link) {
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return attrs
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}
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val := []string{}
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if flags&NofollowLinks != 0 {
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val = append(val, "nofollow")
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}
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if flags&NoreferrerLinks != 0 {
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val = append(val, "noreferrer")
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}
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if flags&HrefTargetBlank != 0 {
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attrs = append(attrs, "target=\"_blank\"")
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}
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if len(val) == 0 {
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return attrs
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}
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attr := fmt.Sprintf("rel=%q", strings.Join(val, " "))
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return append(attrs, attr)
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}
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func isMailto(link []byte) bool {
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return bytes.HasPrefix(link, []byte("mailto:"))
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}
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func needSkipLink(flags HTMLFlags, dest []byte) bool {
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if flags&SkipLinks != 0 {
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return true
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}
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return flags&Safelink != 0 && !isSafeLink(dest) && !isMailto(dest)
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}
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func isSmartypantable(node *Node) bool {
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pt := node.Parent.Type
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return pt != Link && pt != CodeBlock && pt != Code
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}
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func appendLanguageAttr(attrs []string, info []byte) []string {
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infoWords := bytes.Split(info, []byte("\t "))
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if len(infoWords) > 0 && len(infoWords[0]) > 0 {
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attrs = append(attrs, fmt.Sprintf("class=\"language-%s\"", infoWords[0]))
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}
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return attrs
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}
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func tag(name string, attrs []string, selfClosing bool) []byte {
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result := "<" + name
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if attrs != nil && len(attrs) > 0 {
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result += " " + strings.Join(attrs, " ")
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}
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if selfClosing {
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result += " /"
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}
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return []byte(result + ">")
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}
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func footnoteRef(prefix string, node *Node) []byte {
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urlFrag := prefix + string(slugify(node.Destination))
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anchor := fmt.Sprintf(`<a rel="footnote" href="#fn:%s">%d</a>`, urlFrag, node.NoteID)
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return []byte(fmt.Sprintf(`<sup class="footnote-ref" id="fnref:%s">%s</sup>`, urlFrag, anchor))
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}
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func footnoteItem(prefix string, slug []byte) []byte {
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return []byte(fmt.Sprintf(`<li id="fn:%s%s">`, prefix, slug))
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}
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func footnoteReturnLink(prefix, returnLink string, slug []byte) []byte {
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const format = ` <a class="footnote-return" href="#fnref:%s%s">%s</a>`
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return []byte(fmt.Sprintf(format, prefix, slug, returnLink))
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}
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func itemOpenCR(node *Node) bool {
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if node.Prev == nil {
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return false
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}
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ld := node.Parent.ListData
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return !ld.Tight && ld.ListFlags&ListTypeDefinition == 0
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}
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func skipParagraphTags(node *Node) bool {
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grandparent := node.Parent.Parent
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if grandparent == nil || grandparent.Type != List {
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return false
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}
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tightOrTerm := grandparent.Tight || node.Parent.ListFlags&ListTypeTerm != 0
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return grandparent.Type == List && tightOrTerm
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}
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func cellAlignment(align CellAlignFlags) string {
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switch align {
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case TableAlignmentLeft:
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return "left"
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case TableAlignmentRight:
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return "right"
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case TableAlignmentCenter:
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return "center"
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default:
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return ""
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}
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}
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func esc(text []byte) []byte {
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unesc := []byte(html.UnescapeString(string(text)))
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return escCode(unesc)
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}
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func escCode(text []byte) []byte {
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e1 := []byte(html.EscapeString(string(text)))
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e2 := bytes.Replace(e1, []byte("""), []byte("""), -1)
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return bytes.Replace(e2, []byte("'"), []byte{'\''}, -1)
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}
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func (r *HTMLRenderer) out(w io.Writer, text []byte) {
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if r.disableTags > 0 {
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w.Write(htmlTagRe.ReplaceAll(text, []byte{}))
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} else {
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w.Write(text)
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}
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r.lastOutputLen = len(text)
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}
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func (r *HTMLRenderer) cr(w io.Writer) {
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if r.lastOutputLen > 0 {
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r.out(w, []byte{'\n'})
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}
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}
|
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|
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// RenderNode is a default renderer of a single node of a syntax tree. For
|
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// block nodes it will be called twice: first time with entering=true, second
|
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// time with entering=false, so that it could know when it's working on an open
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// tag and when on close. It writes the result to w.
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//
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// The return value is a way to tell the calling walker to adjust its walk
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// pattern: e.g. it can terminate the traversal by returning Terminate. Or it
|
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// can ask the walker to skip a subtree of this node by returning SkipChildren.
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// The typical behavior is to return GoToNext, which asks for the usual
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// traversal to the next node.
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func (r *HTMLRenderer) RenderNode(w io.Writer, node *Node, entering bool) WalkStatus {
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attrs := []string{}
|
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switch node.Type {
|
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case Text:
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node.Literal = esc(node.Literal)
|
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if r.Flags&Smartypants != 0 {
|
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node.Literal = r.sr.Process(node.Literal)
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}
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r.out(w, node.Literal)
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case Softbreak:
|
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r.out(w, []byte{'\n'})
|
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// TODO: make it configurable via out(renderer.softbreak)
|
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case Hardbreak:
|
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r.out(w, tag("br", nil, true))
|
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r.cr(w)
|
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case Emph:
|
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if entering {
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r.out(w, tag("em", nil, false))
|
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} else {
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r.out(w, tag("/em", nil, false))
|
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}
|
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case Strong:
|
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if entering {
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r.out(w, tag("strong", nil, false))
|
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} else {
|
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r.out(w, tag("/strong", nil, false))
|
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}
|
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case Del:
|
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if entering {
|
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r.out(w, tag("del", nil, false))
|
|
} else {
|
|
r.out(w, tag("/del", nil, false))
|
|
}
|
|
case HTMLSpan:
|
|
if r.Flags&SkipHTML != 0 {
|
|
break
|
|
}
|
|
if r.Flags&SkipStyle != 0 && isHTMLTag(node.Literal, "style") {
|
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break
|
|
}
|
|
//if options.safe {
|
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// out(w, "<!-- raw HTML omitted -->")
|
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//} else {
|
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r.out(w, node.Literal)
|
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//}
|
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case Link:
|
|
// mark it but don't link it if it is not a safe link: no smartypants
|
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dest := node.LinkData.Destination
|
|
if needSkipLink(r.Flags, dest) {
|
|
if entering {
|
|
r.out(w, tag("tt", nil, false))
|
|
} else {
|
|
r.out(w, tag("/tt", nil, false))
|
|
}
|
|
} else {
|
|
if entering {
|
|
dest = r.addAbsPrefix(dest)
|
|
//if (!(options.safe && potentiallyUnsafe(node.destination))) {
|
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attrs = append(attrs, fmt.Sprintf("href=%q", esc(dest)))
|
|
//}
|
|
if node.NoteID != 0 {
|
|
r.out(w, footnoteRef(r.FootnoteAnchorPrefix, node))
|
|
break
|
|
}
|
|
attrs = appendLinkAttrs(attrs, r.Flags, dest)
|
|
if len(node.LinkData.Title) > 0 {
|
|
attrs = append(attrs, fmt.Sprintf("title=%q", esc(node.LinkData.Title)))
|
|
}
|
|
r.out(w, tag("a", attrs, false))
|
|
} else {
|
|
if node.NoteID != 0 {
|
|
break
|
|
}
|
|
r.out(w, tag("/a", nil, false))
|
|
}
|
|
}
|
|
case Image:
|
|
if r.Flags&SkipImages != 0 {
|
|
return SkipChildren
|
|
}
|
|
if entering {
|
|
dest := node.LinkData.Destination
|
|
dest = r.addAbsPrefix(dest)
|
|
if r.disableTags == 0 {
|
|
//if options.safe && potentiallyUnsafe(dest) {
|
|
//out(w, `<img src="" alt="`)
|
|
//} else {
|
|
r.out(w, []byte(fmt.Sprintf(`<img src="%s" alt="`, esc(dest))))
|
|
//}
|
|
}
|
|
r.disableTags++
|
|
} else {
|
|
r.disableTags--
|
|
if r.disableTags == 0 {
|
|
if node.LinkData.Title != nil {
|
|
r.out(w, []byte(`" title="`))
|
|
r.out(w, esc(node.LinkData.Title))
|
|
}
|
|
r.out(w, []byte(`" />`))
|
|
}
|
|
}
|
|
case Code:
|
|
r.out(w, tag("code", nil, false))
|
|
r.out(w, escCode(node.Literal))
|
|
r.out(w, tag("/code", nil, false))
|
|
case Document:
|
|
break
|
|
case Paragraph:
|
|
if skipParagraphTags(node) {
|
|
break
|
|
}
|
|
if entering {
|
|
// TODO: untangle this clusterfuck about when the newlines need
|
|
// to be added and when not.
|
|
if node.Prev != nil {
|
|
switch node.Prev.Type {
|
|
case HTMLBlock, List, Paragraph, Header, CodeBlock, BlockQuote, HorizontalRule:
|
|
r.cr(w)
|
|
}
|
|
}
|
|
if node.Parent.Type == BlockQuote && node.Prev == nil {
|
|
r.cr(w)
|
|
}
|
|
r.out(w, tag("p", attrs, false))
|
|
} else {
|
|
r.out(w, tag("/p", attrs, false))
|
|
if !(node.Parent.Type == Item && node.Next == nil) {
|
|
r.cr(w)
|
|
}
|
|
}
|
|
case BlockQuote:
|
|
if entering {
|
|
r.cr(w)
|
|
r.out(w, tag("blockquote", attrs, false))
|
|
} else {
|
|
r.out(w, tag("/blockquote", nil, false))
|
|
r.cr(w)
|
|
}
|
|
case HTMLBlock:
|
|
if r.Flags&SkipHTML != 0 {
|
|
break
|
|
}
|
|
r.cr(w)
|
|
r.out(w, node.Literal)
|
|
r.cr(w)
|
|
case Header:
|
|
tagname := fmt.Sprintf("h%d", node.Level)
|
|
if entering {
|
|
if node.IsTitleblock {
|
|
attrs = append(attrs, `class="title"`)
|
|
}
|
|
if node.HeaderID != "" {
|
|
id := r.ensureUniqueHeaderID(node.HeaderID)
|
|
if r.HeaderIDPrefix != "" {
|
|
id = r.HeaderIDPrefix + id
|
|
}
|
|
if r.HeaderIDSuffix != "" {
|
|
id = id + r.HeaderIDSuffix
|
|
}
|
|
attrs = append(attrs, fmt.Sprintf(`id="%s"`, id))
|
|
}
|
|
r.cr(w)
|
|
r.out(w, tag(tagname, attrs, false))
|
|
} else {
|
|
r.out(w, tag("/"+tagname, nil, false))
|
|
if !(node.Parent.Type == Item && node.Next == nil) {
|
|
r.cr(w)
|
|
}
|
|
}
|
|
case HorizontalRule:
|
|
r.cr(w)
|
|
r.out(w, tag("hr", attrs, r.Flags&UseXHTML != 0))
|
|
r.cr(w)
|
|
case List:
|
|
tagName := "ul"
|
|
if node.ListFlags&ListTypeOrdered != 0 {
|
|
tagName = "ol"
|
|
}
|
|
if node.ListFlags&ListTypeDefinition != 0 {
|
|
tagName = "dl"
|
|
}
|
|
if entering {
|
|
if node.IsFootnotesList {
|
|
r.out(w, []byte("\n<div class=\"footnotes\">\n\n"))
|
|
r.out(w, tag("hr", attrs, r.Flags&UseXHTML != 0))
|
|
r.cr(w)
|
|
}
|
|
r.cr(w)
|
|
if node.Parent.Type == Item && node.Parent.Parent.Tight {
|
|
r.cr(w)
|
|
}
|
|
r.out(w, tag(tagName, attrs, false))
|
|
r.cr(w)
|
|
} else {
|
|
r.out(w, tag("/"+tagName, nil, false))
|
|
//cr(w)
|
|
//if node.parent.Type != Item {
|
|
// cr(w)
|
|
//}
|
|
if node.Parent.Type == Item && node.Next != nil {
|
|
r.cr(w)
|
|
}
|
|
if node.Parent.Type == Document || node.Parent.Type == BlockQuote {
|
|
r.cr(w)
|
|
}
|
|
if node.IsFootnotesList {
|
|
r.out(w, []byte("\n</div>\n"))
|
|
}
|
|
}
|
|
case Item:
|
|
tagName := "li"
|
|
if node.ListFlags&ListTypeDefinition != 0 {
|
|
tagName = "dd"
|
|
}
|
|
if node.ListFlags&ListTypeTerm != 0 {
|
|
tagName = "dt"
|
|
}
|
|
if entering {
|
|
if itemOpenCR(node) {
|
|
r.cr(w)
|
|
}
|
|
if node.ListData.RefLink != nil {
|
|
slug := slugify(node.ListData.RefLink)
|
|
r.out(w, footnoteItem(r.FootnoteAnchorPrefix, slug))
|
|
break
|
|
}
|
|
r.out(w, tag(tagName, nil, false))
|
|
} else {
|
|
if node.ListData.RefLink != nil {
|
|
slug := slugify(node.ListData.RefLink)
|
|
if r.Flags&FootnoteReturnLinks != 0 {
|
|
r.out(w, footnoteReturnLink(r.FootnoteAnchorPrefix, r.FootnoteReturnLinkContents, slug))
|
|
}
|
|
}
|
|
r.out(w, tag("/"+tagName, nil, false))
|
|
r.cr(w)
|
|
}
|
|
case CodeBlock:
|
|
attrs = appendLanguageAttr(attrs, node.Info)
|
|
r.cr(w)
|
|
r.out(w, tag("pre", nil, false))
|
|
r.out(w, tag("code", attrs, false))
|
|
r.out(w, escCode(node.Literal))
|
|
r.out(w, tag("/code", nil, false))
|
|
r.out(w, tag("/pre", nil, false))
|
|
if node.Parent.Type != Item {
|
|
r.cr(w)
|
|
}
|
|
case Table:
|
|
if entering {
|
|
r.cr(w)
|
|
r.out(w, tag("table", nil, false))
|
|
} else {
|
|
r.out(w, tag("/table", nil, false))
|
|
r.cr(w)
|
|
}
|
|
case TableCell:
|
|
tagName := "td"
|
|
if node.IsHeader {
|
|
tagName = "th"
|
|
}
|
|
if entering {
|
|
align := cellAlignment(node.Align)
|
|
if align != "" {
|
|
attrs = append(attrs, fmt.Sprintf(`align="%s"`, align))
|
|
}
|
|
if node.Prev == nil {
|
|
r.cr(w)
|
|
}
|
|
r.out(w, tag(tagName, attrs, false))
|
|
} else {
|
|
r.out(w, tag("/"+tagName, nil, false))
|
|
r.cr(w)
|
|
}
|
|
case TableHead:
|
|
if entering {
|
|
r.cr(w)
|
|
r.out(w, tag("thead", nil, false))
|
|
} else {
|
|
r.out(w, tag("/thead", nil, false))
|
|
r.cr(w)
|
|
}
|
|
case TableBody:
|
|
if entering {
|
|
r.cr(w)
|
|
r.out(w, tag("tbody", nil, false))
|
|
// XXX: this is to adhere to a rather silly test. Should fix test.
|
|
if node.FirstChild == nil {
|
|
r.cr(w)
|
|
}
|
|
} else {
|
|
r.out(w, tag("/tbody", nil, false))
|
|
r.cr(w)
|
|
}
|
|
case TableRow:
|
|
if entering {
|
|
r.cr(w)
|
|
r.out(w, tag("tr", nil, false))
|
|
} else {
|
|
r.out(w, tag("/tr", nil, false))
|
|
r.cr(w)
|
|
}
|
|
default:
|
|
panic("Unknown node type " + node.Type.String())
|
|
}
|
|
return GoToNext
|
|
}
|
|
|
|
func (r *HTMLRenderer) writeDocumentHeader(w *bytes.Buffer) {
|
|
if r.Flags&CompletePage == 0 {
|
|
return
|
|
}
|
|
ending := ""
|
|
if r.Flags&UseXHTML != 0 {
|
|
w.WriteString("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" ")
|
|
w.WriteString("\"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n")
|
|
w.WriteString("<html xmlns=\"http://www.w3.org/1999/xhtml\">\n")
|
|
ending = " /"
|
|
} else {
|
|
w.WriteString("<!DOCTYPE html>\n")
|
|
w.WriteString("<html>\n")
|
|
}
|
|
w.WriteString("<head>\n")
|
|
w.WriteString(" <title>")
|
|
if r.Flags&Smartypants != 0 {
|
|
w.Write(r.sr.Process([]byte(r.Title)))
|
|
} else {
|
|
w.Write(esc([]byte(r.Title)))
|
|
}
|
|
w.WriteString("</title>\n")
|
|
w.WriteString(" <meta name=\"GENERATOR\" content=\"Blackfriday Markdown Processor v")
|
|
w.WriteString(Version)
|
|
w.WriteString("\"")
|
|
w.WriteString(ending)
|
|
w.WriteString(">\n")
|
|
w.WriteString(" <meta charset=\"utf-8\"")
|
|
w.WriteString(ending)
|
|
w.WriteString(">\n")
|
|
if r.CSS != "" {
|
|
w.WriteString(" <link rel=\"stylesheet\" type=\"text/css\" href=\"")
|
|
w.Write(esc([]byte(r.CSS)))
|
|
w.WriteString("\"")
|
|
w.WriteString(ending)
|
|
w.WriteString(">\n")
|
|
}
|
|
if r.Icon != "" {
|
|
w.WriteString(" <link rel=\"icon\" type=\"image/x-icon\" href=\"")
|
|
w.Write(esc([]byte(r.Icon)))
|
|
w.WriteString("\"")
|
|
w.WriteString(ending)
|
|
w.WriteString(">\n")
|
|
}
|
|
w.WriteString("</head>\n")
|
|
w.WriteString("<body>\n\n")
|
|
}
|
|
|
|
func (r *HTMLRenderer) writeTOC(w *bytes.Buffer, ast *Node) {
|
|
buf := bytes.Buffer{}
|
|
|
|
inHeader := false
|
|
tocLevel := 0
|
|
headerCount := 0
|
|
|
|
ast.Walk(func(node *Node, entering bool) WalkStatus {
|
|
if node.Type == Header && !node.HeaderData.IsTitleblock {
|
|
inHeader = entering
|
|
if entering {
|
|
node.HeaderID = fmt.Sprintf("toc_%d", headerCount)
|
|
if node.Level == tocLevel {
|
|
buf.WriteString("</li>\n\n<li>")
|
|
} else if node.Level < tocLevel {
|
|
for node.Level < tocLevel {
|
|
tocLevel--
|
|
buf.WriteString("</li>\n</ul>")
|
|
}
|
|
buf.WriteString("</li>\n\n<li>")
|
|
} else {
|
|
for node.Level > tocLevel {
|
|
tocLevel++
|
|
buf.WriteString("\n<ul>\n<li>")
|
|
}
|
|
}
|
|
|
|
fmt.Fprintf(&buf, `<a href="#toc_%d">`, headerCount)
|
|
headerCount++
|
|
} else {
|
|
buf.WriteString("</a>")
|
|
}
|
|
return GoToNext
|
|
}
|
|
|
|
if inHeader {
|
|
return r.RenderNode(&buf, node, entering)
|
|
}
|
|
|
|
return GoToNext
|
|
})
|
|
|
|
for ; tocLevel > 0; tocLevel-- {
|
|
buf.WriteString("</li>\n</ul>")
|
|
}
|
|
|
|
if buf.Len() > 0 {
|
|
w.WriteString("<nav>\n")
|
|
w.Write(buf.Bytes())
|
|
w.WriteString("\n\n</nav>\n")
|
|
}
|
|
}
|
|
|
|
func (r *HTMLRenderer) writeDocumentFooter(w *bytes.Buffer) {
|
|
if r.Flags&CompletePage == 0 {
|
|
return
|
|
}
|
|
w.WriteString("\n</body>\n</html>\n")
|
|
}
|
|
|
|
// Render walks the specified syntax (sub)tree and returns a HTML document.
|
|
func (r *HTMLRenderer) Render(ast *Node) []byte {
|
|
//println("render_Blackfriday")
|
|
//dump(ast)
|
|
var buff bytes.Buffer
|
|
r.writeDocumentHeader(&buff)
|
|
if r.Extensions&TOC != 0 || r.Extensions&OmitContents != 0 {
|
|
r.writeTOC(&buff, ast)
|
|
if r.Extensions&OmitContents != 0 {
|
|
return buff.Bytes()
|
|
}
|
|
}
|
|
ast.Walk(func(node *Node, entering bool) WalkStatus {
|
|
return r.RenderNode(&buff, node, entering)
|
|
})
|
|
r.writeDocumentFooter(&buff)
|
|
return buff.Bytes()
|
|
}
|