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yakumo_izuru |
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// |
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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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"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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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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NoopenerLinks // Only link with rel="noopener" |
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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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SmartypantsQuotesNBSP // Enable « French guillemets » (with Smartypants) |
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TOC // Generate a table of contents |
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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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const ( |
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htmlTag = "(?:" + openTag + "|" + closeTag + "|" + htmlComment + "|" + |
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processingInstruction + "|" + declaration + "|" + cdata + ")" |
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closeTag = "</" + tagName + "\\s*[>]" |
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openTag = "<" + tagName + attribute + "*" + "\\s*/?>" |
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attribute = "(?:" + "\\s+" + attributeName + attributeValueSpec + "?)" |
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attributeValue = "(?:" + unquotedValue + "|" + singleQuotedValue + "|" + doubleQuotedValue + ")" |
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attributeValueSpec = "(?:" + "\\s*=" + "\\s*" + attributeValue + ")" |
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attributeName = "[a-zA-Z_:][a-zA-Z0-9:._-]*" |
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cdata = "<!\\[CDATA\\[[\\s\\S]*?\\]\\]>" |
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declaration = "<![A-Z]+" + "\\s+[^>]*>" |
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doubleQuotedValue = "\"[^\"]*\"" |
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htmlComment = "<!---->|<!--(?:-?[^>-])(?:-?[^-])*-->" |
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processingInstruction = "[<][?].*?[?][>]" |
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singleQuotedValue = "'[^']*'" |
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tagName = "[A-Za-z][A-Za-z0-9-]*" |
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unquotedValue = "[^\"'=<>`\\x00-\\x20]+" |
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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 Heading ID, to ensure |
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// uniqueness. |
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HeadingIDPrefix string |
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// If set, add this text to the back of each Heading ID, to ensure uniqueness. |
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HeadingIDSuffix string |
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// Increase heading levels: if the offset is 1, <h1> becomes <h2> etc. |
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// Negative offset is also valid. |
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// Resulting levels are clipped between 1 and 6. |
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HeadingLevelOffset int |
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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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} |
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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 heading IDs to prevent ID collision in a single generation. |
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headingIDs 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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// U+FE0E is VARIATION SELECTOR-15. |
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// It suppresses automatic emoji presentation of the preceding |
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// U+21A9 LEFTWARDS ARROW WITH HOOK on iOS and iPadOS. |
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params.FootnoteReturnLinkContents = "<span aria-label='Return'>↩\ufe0e</span>" |
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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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headingIDs: 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) ensureUniqueHeadingID(id string) string { |
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for count, found := r.headingIDs[id]; found; count, found = r.headingIDs[id] { |
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tmp := fmt.Sprintf("%s-%d", id, count+1) |
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if _, tmpFound := r.headingIDs[tmp]; !tmpFound { |
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r.headingIDs[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.headingIDs[id]; !found { |
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r.headingIDs[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&NoopenerLinks != 0 { |
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val = append(val, "noopener") |
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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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if len(info) == 0 { |
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return attrs |
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} |
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endOfLang := bytes.IndexAny(info, "\t ") |
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if endOfLang < 0 { |
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endOfLang = len(info) |
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} |
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return append(attrs, fmt.Sprintf("class=\"language-%s\"", info[:endOfLang])) |
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} |
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func (r *HTMLRenderer) tag(w io.Writer, name []byte, attrs []string) { |
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w.Write(name) |
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if len(attrs) > 0 { |
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w.Write(spaceBytes) |
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w.Write([]byte(strings.Join(attrs, " "))) |
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} |
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w.Write(gtBytes) |
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r.lastOutputLen = 1 |
| 341 |
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} |
| 342 |
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| 343 |
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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 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)) |
| 347 |
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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)) |
| 351 |
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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)) |
| 356 |
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} |
| 357 |
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| 358 |
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func itemOpenCR(node *Node) bool { |
| 359 |
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if node.Prev == nil { |
| 360 |
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return false |
| 361 |
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} |
| 362 |
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ld := node.Parent.ListData |
| 363 |
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return !ld.Tight && ld.ListFlags&ListTypeDefinition == 0 |
| 364 |
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} |
| 365 |
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func skipParagraphTags(node *Node) bool { |
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grandparent := node.Parent.Parent |
| 368 |
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if grandparent == nil || grandparent.Type != List { |
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return false |
| 370 |
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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 |
| 373 |
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} |
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| 375 |
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func cellAlignment(align CellAlignFlags) string { |
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switch align { |
| 377 |
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case TableAlignmentLeft: |
| 378 |
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return "left" |
| 379 |
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case TableAlignmentRight: |
| 380 |
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return "right" |
| 381 |
|
|
case TableAlignmentCenter: |
| 382 |
|
|
return "center" |
| 383 |
|
|
default: |
| 384 |
|
|
return "" |
| 385 |
|
|
} |
| 386 |
|
|
} |
| 387 |
|
|
|
| 388 |
|
|
func (r *HTMLRenderer) out(w io.Writer, text []byte) { |
| 389 |
|
|
if r.disableTags > 0 { |
| 390 |
|
|
w.Write(htmlTagRe.ReplaceAll(text, []byte{})) |
| 391 |
|
|
} else { |
| 392 |
|
|
w.Write(text) |
| 393 |
|
|
} |
| 394 |
|
|
r.lastOutputLen = len(text) |
| 395 |
|
|
} |
| 396 |
|
|
|
| 397 |
|
|
func (r *HTMLRenderer) cr(w io.Writer) { |
| 398 |
|
|
if r.lastOutputLen > 0 { |
| 399 |
|
|
r.out(w, nlBytes) |
| 400 |
|
|
} |
| 401 |
|
|
} |
| 402 |
|
|
|
| 403 |
|
|
var ( |
| 404 |
|
|
nlBytes = []byte{'\n'} |
| 405 |
|
|
gtBytes = []byte{'>'} |
| 406 |
|
|
spaceBytes = []byte{' '} |
| 407 |
|
|
) |
| 408 |
|
|
|
| 409 |
|
|
var ( |
| 410 |
|
|
brTag = []byte("<br>") |
| 411 |
|
|
brXHTMLTag = []byte("<br />") |
| 412 |
|
|
emTag = []byte("<em>") |
| 413 |
|
|
emCloseTag = []byte("</em>") |
| 414 |
|
|
strongTag = []byte("<strong>") |
| 415 |
|
|
strongCloseTag = []byte("</strong>") |
| 416 |
|
|
delTag = []byte("<del>") |
| 417 |
|
|
delCloseTag = []byte("</del>") |
| 418 |
|
|
ttTag = []byte("<tt>") |
| 419 |
|
|
ttCloseTag = []byte("</tt>") |
| 420 |
|
|
aTag = []byte("<a") |
| 421 |
|
|
aCloseTag = []byte("</a>") |
| 422 |
|
|
preTag = []byte("<pre>") |
| 423 |
|
|
preCloseTag = []byte("</pre>") |
| 424 |
|
|
codeTag = []byte("<code>") |
| 425 |
|
|
codeCloseTag = []byte("</code>") |
| 426 |
|
|
pTag = []byte("<p>") |
| 427 |
|
|
pCloseTag = []byte("</p>") |
| 428 |
|
|
blockquoteTag = []byte("<blockquote>") |
| 429 |
|
|
blockquoteCloseTag = []byte("</blockquote>") |
| 430 |
|
|
hrTag = []byte("<hr>") |
| 431 |
|
|
hrXHTMLTag = []byte("<hr />") |
| 432 |
|
|
ulTag = []byte("<ul>") |
| 433 |
|
|
ulCloseTag = []byte("</ul>") |
| 434 |
|
|
olTag = []byte("<ol>") |
| 435 |
|
|
olCloseTag = []byte("</ol>") |
| 436 |
|
|
dlTag = []byte("<dl>") |
| 437 |
|
|
dlCloseTag = []byte("</dl>") |
| 438 |
|
|
liTag = []byte("<li>") |
| 439 |
|
|
liCloseTag = []byte("</li>") |
| 440 |
|
|
ddTag = []byte("<dd>") |
| 441 |
|
|
ddCloseTag = []byte("</dd>") |
| 442 |
|
|
dtTag = []byte("<dt>") |
| 443 |
|
|
dtCloseTag = []byte("</dt>") |
| 444 |
|
|
tableTag = []byte("<table>") |
| 445 |
|
|
tableCloseTag = []byte("</table>") |
| 446 |
|
|
tdTag = []byte("<td") |
| 447 |
|
|
tdCloseTag = []byte("</td>") |
| 448 |
|
|
thTag = []byte("<th") |
| 449 |
|
|
thCloseTag = []byte("</th>") |
| 450 |
|
|
theadTag = []byte("<thead>") |
| 451 |
|
|
theadCloseTag = []byte("</thead>") |
| 452 |
|
|
tbodyTag = []byte("<tbody>") |
| 453 |
|
|
tbodyCloseTag = []byte("</tbody>") |
| 454 |
|
|
trTag = []byte("<tr>") |
| 455 |
|
|
trCloseTag = []byte("</tr>") |
| 456 |
|
|
h1Tag = []byte("<h1") |
| 457 |
|
|
h1CloseTag = []byte("</h1>") |
| 458 |
|
|
h2Tag = []byte("<h2") |
| 459 |
|
|
h2CloseTag = []byte("</h2>") |
| 460 |
|
|
h3Tag = []byte("<h3") |
| 461 |
|
|
h3CloseTag = []byte("</h3>") |
| 462 |
|
|
h4Tag = []byte("<h4") |
| 463 |
|
|
h4CloseTag = []byte("</h4>") |
| 464 |
|
|
h5Tag = []byte("<h5") |
| 465 |
|
|
h5CloseTag = []byte("</h5>") |
| 466 |
|
|
h6Tag = []byte("<h6") |
| 467 |
|
|
h6CloseTag = []byte("</h6>") |
| 468 |
|
|
|
| 469 |
|
|
footnotesDivBytes = []byte("\n<div class=\"footnotes\">\n\n") |
| 470 |
|
|
footnotesCloseDivBytes = []byte("\n</div>\n") |
| 471 |
|
|
) |
| 472 |
|
|
|
| 473 |
|
|
func headingTagsFromLevel(level int) ([]byte, []byte) { |
| 474 |
|
|
if level <= 1 { |
| 475 |
|
|
return h1Tag, h1CloseTag |
| 476 |
|
|
} |
| 477 |
|
|
switch level { |
| 478 |
|
|
case 2: |
| 479 |
|
|
return h2Tag, h2CloseTag |
| 480 |
|
|
case 3: |
| 481 |
|
|
return h3Tag, h3CloseTag |
| 482 |
|
|
case 4: |
| 483 |
|
|
return h4Tag, h4CloseTag |
| 484 |
|
|
case 5: |
| 485 |
|
|
return h5Tag, h5CloseTag |
| 486 |
|
|
} |
| 487 |
|
|
return h6Tag, h6CloseTag |
| 488 |
|
|
} |
| 489 |
|
|
|
| 490 |
|
|
func (r *HTMLRenderer) outHRTag(w io.Writer) { |
| 491 |
|
|
if r.Flags&UseXHTML == 0 { |
| 492 |
|
|
r.out(w, hrTag) |
| 493 |
|
|
} else { |
| 494 |
|
|
r.out(w, hrXHTMLTag) |
| 495 |
|
|
} |
| 496 |
|
|
} |
| 497 |
|
|
|
| 498 |
|
|
// RenderNode is a default renderer of a single node of a syntax tree. For |
| 499 |
|
|
// block nodes it will be called twice: first time with entering=true, second |
| 500 |
|
|
// time with entering=false, so that it could know when it's working on an open |
| 501 |
|
|
// tag and when on close. It writes the result to w. |
| 502 |
|
|
// |
| 503 |
|
|
// The return value is a way to tell the calling walker to adjust its walk |
| 504 |
|
|
// pattern: e.g. it can terminate the traversal by returning Terminate. Or it |
| 505 |
|
|
// can ask the walker to skip a subtree of this node by returning SkipChildren. |
| 506 |
|
|
// The typical behavior is to return GoToNext, which asks for the usual |
| 507 |
|
|
// traversal to the next node. |
| 508 |
|
|
func (r *HTMLRenderer) RenderNode(w io.Writer, node *Node, entering bool) WalkStatus { |
| 509 |
|
|
attrs := []string{} |
| 510 |
|
|
switch node.Type { |
| 511 |
|
|
case Text: |
| 512 |
|
|
if r.Flags&Smartypants != 0 { |
| 513 |
|
|
var tmp bytes.Buffer |
| 514 |
|
|
escapeHTML(&tmp, node.Literal) |
| 515 |
|
|
r.sr.Process(w, tmp.Bytes()) |
| 516 |
|
|
} else { |
| 517 |
|
|
if node.Parent.Type == Link { |
| 518 |
|
|
escLink(w, node.Literal) |
| 519 |
|
|
} else { |
| 520 |
|
|
escapeHTML(w, node.Literal) |
| 521 |
|
|
} |
| 522 |
|
|
} |
| 523 |
|
|
case Softbreak: |
| 524 |
|
|
r.cr(w) |
| 525 |
|
|
// TODO: make it configurable via out(renderer.softbreak) |
| 526 |
|
|
case Hardbreak: |
| 527 |
|
|
if r.Flags&UseXHTML == 0 { |
| 528 |
|
|
r.out(w, brTag) |
| 529 |
|
|
} else { |
| 530 |
|
|
r.out(w, brXHTMLTag) |
| 531 |
|
|
} |
| 532 |
|
|
r.cr(w) |
| 533 |
|
|
case Emph: |
| 534 |
|
|
if entering { |
| 535 |
|
|
r.out(w, emTag) |
| 536 |
|
|
} else { |
| 537 |
|
|
r.out(w, emCloseTag) |
| 538 |
|
|
} |
| 539 |
|
|
case Strong: |
| 540 |
|
|
if entering { |
| 541 |
|
|
r.out(w, strongTag) |
| 542 |
|
|
} else { |
| 543 |
|
|
r.out(w, strongCloseTag) |
| 544 |
|
|
} |
| 545 |
|
|
case Del: |
| 546 |
|
|
if entering { |
| 547 |
|
|
r.out(w, delTag) |
| 548 |
|
|
} else { |
| 549 |
|
|
r.out(w, delCloseTag) |
| 550 |
|
|
} |
| 551 |
|
|
case HTMLSpan: |
| 552 |
|
|
if r.Flags&SkipHTML != 0 { |
| 553 |
|
|
break |
| 554 |
|
|
} |
| 555 |
|
|
r.out(w, node.Literal) |
| 556 |
|
|
case Link: |
| 557 |
|
|
// mark it but don't link it if it is not a safe link: no smartypants |
| 558 |
|
|
dest := node.LinkData.Destination |
| 559 |
|
|
if needSkipLink(r.Flags, dest) { |
| 560 |
|
|
if entering { |
| 561 |
|
|
r.out(w, ttTag) |
| 562 |
|
|
} else { |
| 563 |
|
|
r.out(w, ttCloseTag) |
| 564 |
|
|
} |
| 565 |
|
|
} else { |
| 566 |
|
|
if entering { |
| 567 |
|
|
dest = r.addAbsPrefix(dest) |
| 568 |
|
|
var hrefBuf bytes.Buffer |
| 569 |
|
|
hrefBuf.WriteString("href=\"") |
| 570 |
|
|
escLink(&hrefBuf, dest) |
| 571 |
|
|
hrefBuf.WriteByte('"') |
| 572 |
|
|
attrs = append(attrs, hrefBuf.String()) |
| 573 |
|
|
if node.NoteID != 0 { |
| 574 |
|
|
r.out(w, footnoteRef(r.FootnoteAnchorPrefix, node)) |
| 575 |
|
|
break |
| 576 |
|
|
} |
| 577 |
|
|
attrs = appendLinkAttrs(attrs, r.Flags, dest) |
| 578 |
|
|
if len(node.LinkData.Title) > 0 { |
| 579 |
|
|
var titleBuff bytes.Buffer |
| 580 |
|
|
titleBuff.WriteString("title=\"") |
| 581 |
|
|
escapeHTML(&titleBuff, node.LinkData.Title) |
| 582 |
|
|
titleBuff.WriteByte('"') |
| 583 |
|
|
attrs = append(attrs, titleBuff.String()) |
| 584 |
|
|
} |
| 585 |
|
|
r.tag(w, aTag, attrs) |
| 586 |
|
|
} else { |
| 587 |
|
|
if node.NoteID != 0 { |
| 588 |
|
|
break |
| 589 |
|
|
} |
| 590 |
|
|
r.out(w, aCloseTag) |
| 591 |
|
|
} |
| 592 |
|
|
} |
| 593 |
|
|
case Image: |
| 594 |
|
|
if r.Flags&SkipImages != 0 { |
| 595 |
|
|
return SkipChildren |
| 596 |
|
|
} |
| 597 |
|
|
if entering { |
| 598 |
|
|
dest := node.LinkData.Destination |
| 599 |
|
|
dest = r.addAbsPrefix(dest) |
| 600 |
|
|
if r.disableTags == 0 { |
| 601 |
|
|
//if options.safe && potentiallyUnsafe(dest) { |
| 602 |
|
|
//out(w, `<img src="" alt="`) |
| 603 |
|
|
//} else { |
| 604 |
|
|
r.out(w, []byte(`<img src="`)) |
| 605 |
|
|
escLink(w, dest) |
| 606 |
|
|
r.out(w, []byte(`" alt="`)) |
| 607 |
|
|
//} |
| 608 |
|
|
} |
| 609 |
|
|
r.disableTags++ |
| 610 |
|
|
} else { |
| 611 |
|
|
r.disableTags-- |
| 612 |
|
|
if r.disableTags == 0 { |
| 613 |
|
|
if node.LinkData.Title != nil { |
| 614 |
|
|
r.out(w, []byte(`" title="`)) |
| 615 |
|
|
escapeHTML(w, node.LinkData.Title) |
| 616 |
|
|
} |
| 617 |
|
|
r.out(w, []byte(`" />`)) |
| 618 |
|
|
} |
| 619 |
|
|
} |
| 620 |
|
|
case Code: |
| 621 |
|
|
r.out(w, codeTag) |
| 622 |
|
|
escapeAllHTML(w, node.Literal) |
| 623 |
|
|
r.out(w, codeCloseTag) |
| 624 |
|
|
case Document: |
| 625 |
|
|
break |
| 626 |
|
|
case Paragraph: |
| 627 |
|
|
if skipParagraphTags(node) { |
| 628 |
|
|
break |
| 629 |
|
|
} |
| 630 |
|
|
if entering { |
| 631 |
|
|
// TODO: untangle this clusterfuck about when the newlines need |
| 632 |
|
|
// to be added and when not. |
| 633 |
|
|
if node.Prev != nil { |
| 634 |
|
|
switch node.Prev.Type { |
| 635 |
|
|
case HTMLBlock, List, Paragraph, Heading, CodeBlock, BlockQuote, HorizontalRule: |
| 636 |
|
|
r.cr(w) |
| 637 |
|
|
} |
| 638 |
|
|
} |
| 639 |
|
|
if node.Parent.Type == BlockQuote && node.Prev == nil { |
| 640 |
|
|
r.cr(w) |
| 641 |
|
|
} |
| 642 |
|
|
r.out(w, pTag) |
| 643 |
|
|
} else { |
| 644 |
|
|
r.out(w, pCloseTag) |
| 645 |
|
|
if !(node.Parent.Type == Item && node.Next == nil) { |
| 646 |
|
|
r.cr(w) |
| 647 |
|
|
} |
| 648 |
|
|
} |
| 649 |
|
|
case BlockQuote: |
| 650 |
|
|
if entering { |
| 651 |
|
|
r.cr(w) |
| 652 |
|
|
r.out(w, blockquoteTag) |
| 653 |
|
|
} else { |
| 654 |
|
|
r.out(w, blockquoteCloseTag) |
| 655 |
|
|
r.cr(w) |
| 656 |
|
|
} |
| 657 |
|
|
case HTMLBlock: |
| 658 |
|
|
if r.Flags&SkipHTML != 0 { |
| 659 |
|
|
break |
| 660 |
|
|
} |
| 661 |
|
|
r.cr(w) |
| 662 |
|
|
r.out(w, node.Literal) |
| 663 |
|
|
r.cr(w) |
| 664 |
|
|
case Heading: |
| 665 |
|
|
headingLevel := r.HTMLRendererParameters.HeadingLevelOffset + node.Level |
| 666 |
|
|
openTag, closeTag := headingTagsFromLevel(headingLevel) |
| 667 |
|
|
if entering { |
| 668 |
|
|
if node.IsTitleblock { |
| 669 |
|
|
attrs = append(attrs, `class="title"`) |
| 670 |
|
|
} |
| 671 |
|
|
if node.HeadingID != "" { |
| 672 |
|
|
id := r.ensureUniqueHeadingID(node.HeadingID) |
| 673 |
|
|
if r.HeadingIDPrefix != "" { |
| 674 |
|
|
id = r.HeadingIDPrefix + id |
| 675 |
|
|
} |
| 676 |
|
|
if r.HeadingIDSuffix != "" { |
| 677 |
|
|
id = id + r.HeadingIDSuffix |
| 678 |
|
|
} |
| 679 |
|
|
attrs = append(attrs, fmt.Sprintf(`id="%s"`, id)) |
| 680 |
|
|
} |
| 681 |
|
|
r.cr(w) |
| 682 |
|
|
r.tag(w, openTag, attrs) |
| 683 |
|
|
} else { |
| 684 |
|
|
r.out(w, closeTag) |
| 685 |
|
|
if !(node.Parent.Type == Item && node.Next == nil) { |
| 686 |
|
|
r.cr(w) |
| 687 |
|
|
} |
| 688 |
|
|
} |
| 689 |
|
|
case HorizontalRule: |
| 690 |
|
|
r.cr(w) |
| 691 |
|
|
r.outHRTag(w) |
| 692 |
|
|
r.cr(w) |
| 693 |
|
|
case List: |
| 694 |
|
|
openTag := ulTag |
| 695 |
|
|
closeTag := ulCloseTag |
| 696 |
|
|
if node.ListFlags&ListTypeOrdered != 0 { |
| 697 |
|
|
openTag = olTag |
| 698 |
|
|
closeTag = olCloseTag |
| 699 |
|
|
} |
| 700 |
|
|
if node.ListFlags&ListTypeDefinition != 0 { |
| 701 |
|
|
openTag = dlTag |
| 702 |
|
|
closeTag = dlCloseTag |
| 703 |
|
|
} |
| 704 |
|
|
if entering { |
| 705 |
|
|
if node.IsFootnotesList { |
| 706 |
|
|
r.out(w, footnotesDivBytes) |
| 707 |
|
|
r.outHRTag(w) |
| 708 |
|
|
r.cr(w) |
| 709 |
|
|
} |
| 710 |
|
|
r.cr(w) |
| 711 |
|
|
if node.Parent.Type == Item && node.Parent.Parent.Tight { |
| 712 |
|
|
r.cr(w) |
| 713 |
|
|
} |
| 714 |
|
|
r.tag(w, openTag[:len(openTag)-1], attrs) |
| 715 |
|
|
r.cr(w) |
| 716 |
|
|
} else { |
| 717 |
|
|
r.out(w, closeTag) |
| 718 |
|
|
//cr(w) |
| 719 |
|
|
//if node.parent.Type != Item { |
| 720 |
|
|
// cr(w) |
| 721 |
|
|
//} |
| 722 |
|
|
if node.Parent.Type == Item && node.Next != nil { |
| 723 |
|
|
r.cr(w) |
| 724 |
|
|
} |
| 725 |
|
|
if node.Parent.Type == Document || node.Parent.Type == BlockQuote { |
| 726 |
|
|
r.cr(w) |
| 727 |
|
|
} |
| 728 |
|
|
if node.IsFootnotesList { |
| 729 |
|
|
r.out(w, footnotesCloseDivBytes) |
| 730 |
|
|
} |
| 731 |
|
|
} |
| 732 |
|
|
case Item: |
| 733 |
|
|
openTag := liTag |
| 734 |
|
|
closeTag := liCloseTag |
| 735 |
|
|
if node.ListFlags&ListTypeDefinition != 0 { |
| 736 |
|
|
openTag = ddTag |
| 737 |
|
|
closeTag = ddCloseTag |
| 738 |
|
|
} |
| 739 |
|
|
if node.ListFlags&ListTypeTerm != 0 { |
| 740 |
|
|
openTag = dtTag |
| 741 |
|
|
closeTag = dtCloseTag |
| 742 |
|
|
} |
| 743 |
|
|
if entering { |
| 744 |
|
|
if itemOpenCR(node) { |
| 745 |
|
|
r.cr(w) |
| 746 |
|
|
} |
| 747 |
|
|
if node.ListData.RefLink != nil { |
| 748 |
|
|
slug := slugify(node.ListData.RefLink) |
| 749 |
|
|
r.out(w, footnoteItem(r.FootnoteAnchorPrefix, slug)) |
| 750 |
|
|
break |
| 751 |
|
|
} |
| 752 |
|
|
r.out(w, openTag) |
| 753 |
|
|
} else { |
| 754 |
|
|
if node.ListData.RefLink != nil { |
| 755 |
|
|
slug := slugify(node.ListData.RefLink) |
| 756 |
|
|
if r.Flags&FootnoteReturnLinks != 0 { |
| 757 |
|
|
r.out(w, footnoteReturnLink(r.FootnoteAnchorPrefix, r.FootnoteReturnLinkContents, slug)) |
| 758 |
|
|
} |
| 759 |
|
|
} |
| 760 |
|
|
r.out(w, closeTag) |
| 761 |
|
|
r.cr(w) |
| 762 |
|
|
} |
| 763 |
|
|
case CodeBlock: |
| 764 |
|
|
attrs = appendLanguageAttr(attrs, node.Info) |
| 765 |
|
|
r.cr(w) |
| 766 |
|
|
r.out(w, preTag) |
| 767 |
|
|
r.tag(w, codeTag[:len(codeTag)-1], attrs) |
| 768 |
|
|
escapeAllHTML(w, node.Literal) |
| 769 |
|
|
r.out(w, codeCloseTag) |
| 770 |
|
|
r.out(w, preCloseTag) |
| 771 |
|
|
if node.Parent.Type != Item { |
| 772 |
|
|
r.cr(w) |
| 773 |
|
|
} |
| 774 |
|
|
case Table: |
| 775 |
|
|
if entering { |
| 776 |
|
|
r.cr(w) |
| 777 |
|
|
r.out(w, tableTag) |
| 778 |
|
|
} else { |
| 779 |
|
|
r.out(w, tableCloseTag) |
| 780 |
|
|
r.cr(w) |
| 781 |
|
|
} |
| 782 |
|
|
case TableCell: |
| 783 |
|
|
openTag := tdTag |
| 784 |
|
|
closeTag := tdCloseTag |
| 785 |
|
|
if node.IsHeader { |
| 786 |
|
|
openTag = thTag |
| 787 |
|
|
closeTag = thCloseTag |
| 788 |
|
|
} |
| 789 |
|
|
if entering { |
| 790 |
|
|
align := cellAlignment(node.Align) |
| 791 |
|
|
if align != "" { |
| 792 |
|
|
attrs = append(attrs, fmt.Sprintf(`align="%s"`, align)) |
| 793 |
|
|
} |
| 794 |
|
|
if node.Prev == nil { |
| 795 |
|
|
r.cr(w) |
| 796 |
|
|
} |
| 797 |
|
|
r.tag(w, openTag, attrs) |
| 798 |
|
|
} else { |
| 799 |
|
|
r.out(w, closeTag) |
| 800 |
|
|
r.cr(w) |
| 801 |
|
|
} |
| 802 |
|
|
case TableHead: |
| 803 |
|
|
if entering { |
| 804 |
|
|
r.cr(w) |
| 805 |
|
|
r.out(w, theadTag) |
| 806 |
|
|
} else { |
| 807 |
|
|
r.out(w, theadCloseTag) |
| 808 |
|
|
r.cr(w) |
| 809 |
|
|
} |
| 810 |
|
|
case TableBody: |
| 811 |
|
|
if entering { |
| 812 |
|
|
r.cr(w) |
| 813 |
|
|
r.out(w, tbodyTag) |
| 814 |
|
|
// XXX: this is to adhere to a rather silly test. Should fix test. |
| 815 |
|
|
if node.FirstChild == nil { |
| 816 |
|
|
r.cr(w) |
| 817 |
|
|
} |
| 818 |
|
|
} else { |
| 819 |
|
|
r.out(w, tbodyCloseTag) |
| 820 |
|
|
r.cr(w) |
| 821 |
|
|
} |
| 822 |
|
|
case TableRow: |
| 823 |
|
|
if entering { |
| 824 |
|
|
r.cr(w) |
| 825 |
|
|
r.out(w, trTag) |
| 826 |
|
|
} else { |
| 827 |
|
|
r.out(w, trCloseTag) |
| 828 |
|
|
r.cr(w) |
| 829 |
|
|
} |
| 830 |
|
|
default: |
| 831 |
|
|
panic("Unknown node type " + node.Type.String()) |
| 832 |
|
|
} |
| 833 |
|
|
return GoToNext |
| 834 |
|
|
} |
| 835 |
|
|
|
| 836 |
|
|
// RenderHeader writes HTML document preamble and TOC if requested. |
| 837 |
|
|
func (r *HTMLRenderer) RenderHeader(w io.Writer, ast *Node) { |
| 838 |
|
|
r.writeDocumentHeader(w) |
| 839 |
|
|
if r.Flags&TOC != 0 { |
| 840 |
|
|
r.writeTOC(w, ast) |
| 841 |
|
|
} |
| 842 |
|
|
} |
| 843 |
|
|
|
| 844 |
|
|
// RenderFooter writes HTML document footer. |
| 845 |
|
|
func (r *HTMLRenderer) RenderFooter(w io.Writer, ast *Node) { |
| 846 |
|
|
if r.Flags&CompletePage == 0 { |
| 847 |
|
|
return |
| 848 |
|
|
} |
| 849 |
|
|
io.WriteString(w, "\n</body>\n</html>\n") |
| 850 |
|
|
} |
| 851 |
|
|
|
| 852 |
|
|
func (r *HTMLRenderer) writeDocumentHeader(w io.Writer) { |
| 853 |
|
|
if r.Flags&CompletePage == 0 { |
| 854 |
|
|
return |
| 855 |
|
|
} |
| 856 |
|
|
ending := "" |
| 857 |
|
|
if r.Flags&UseXHTML != 0 { |
| 858 |
|
|
io.WriteString(w, "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" ") |
| 859 |
|
|
io.WriteString(w, "\"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n") |
| 860 |
|
|
io.WriteString(w, "<html xmlns=\"http://www.w3.org/1999/xhtml\">\n") |
| 861 |
|
|
ending = " /" |
| 862 |
|
|
} else { |
| 863 |
|
|
io.WriteString(w, "<!DOCTYPE html>\n") |
| 864 |
|
|
io.WriteString(w, "<html>\n") |
| 865 |
|
|
} |
| 866 |
|
|
io.WriteString(w, "<head>\n") |
| 867 |
|
|
io.WriteString(w, " <title>") |
| 868 |
|
|
if r.Flags&Smartypants != 0 { |
| 869 |
|
|
r.sr.Process(w, []byte(r.Title)) |
| 870 |
|
|
} else { |
| 871 |
|
|
escapeHTML(w, []byte(r.Title)) |
| 872 |
|
|
} |
| 873 |
|
|
io.WriteString(w, "</title>\n") |
| 874 |
|
|
io.WriteString(w, " <meta name=\"GENERATOR\" content=\"Blackfriday Markdown Processor v") |
| 875 |
|
|
io.WriteString(w, Version) |
| 876 |
|
|
io.WriteString(w, "\"") |
| 877 |
|
|
io.WriteString(w, ending) |
| 878 |
|
|
io.WriteString(w, ">\n") |
| 879 |
|
|
io.WriteString(w, " <meta charset=\"utf-8\"") |
| 880 |
|
|
io.WriteString(w, ending) |
| 881 |
|
|
io.WriteString(w, ">\n") |
| 882 |
|
|
if r.CSS != "" { |
| 883 |
|
|
io.WriteString(w, " <link rel=\"stylesheet\" type=\"text/css\" href=\"") |
| 884 |
|
|
escapeHTML(w, []byte(r.CSS)) |
| 885 |
|
|
io.WriteString(w, "\"") |
| 886 |
|
|
io.WriteString(w, ending) |
| 887 |
|
|
io.WriteString(w, ">\n") |
| 888 |
|
|
} |
| 889 |
|
|
if r.Icon != "" { |
| 890 |
|
|
io.WriteString(w, " <link rel=\"icon\" type=\"image/x-icon\" href=\"") |
| 891 |
|
|
escapeHTML(w, []byte(r.Icon)) |
| 892 |
|
|
io.WriteString(w, "\"") |
| 893 |
|
|
io.WriteString(w, ending) |
| 894 |
|
|
io.WriteString(w, ">\n") |
| 895 |
|
|
} |
| 896 |
|
|
io.WriteString(w, "</head>\n") |
| 897 |
|
|
io.WriteString(w, "<body>\n\n") |
| 898 |
|
|
} |
| 899 |
|
|
|
| 900 |
|
|
func (r *HTMLRenderer) writeTOC(w io.Writer, ast *Node) { |
| 901 |
|
|
buf := bytes.Buffer{} |
| 902 |
|
|
|
| 903 |
|
|
inHeading := false |
| 904 |
|
|
tocLevel := 0 |
| 905 |
|
|
headingCount := 0 |
| 906 |
|
|
|
| 907 |
|
|
ast.Walk(func(node *Node, entering bool) WalkStatus { |
| 908 |
|
|
if node.Type == Heading && !node.HeadingData.IsTitleblock { |
| 909 |
|
|
inHeading = entering |
| 910 |
|
|
if entering { |
| 911 |
|
|
node.HeadingID = fmt.Sprintf("toc_%d", headingCount) |
| 912 |
|
|
if node.Level == tocLevel { |
| 913 |
|
|
buf.WriteString("</li>\n\n<li>") |
| 914 |
|
|
} else if node.Level < tocLevel { |
| 915 |
|
|
for node.Level < tocLevel { |
| 916 |
|
|
tocLevel-- |
| 917 |
|
|
buf.WriteString("</li>\n</ul>") |
| 918 |
|
|
} |
| 919 |
|
|
buf.WriteString("</li>\n\n<li>") |
| 920 |
|
|
} else { |
| 921 |
|
|
for node.Level > tocLevel { |
| 922 |
|
|
tocLevel++ |
| 923 |
|
|
buf.WriteString("\n<ul>\n<li>") |
| 924 |
|
|
} |
| 925 |
|
|
} |
| 926 |
|
|
|
| 927 |
|
|
fmt.Fprintf(&buf, `<a href="#toc_%d">`, headingCount) |
| 928 |
|
|
headingCount++ |
| 929 |
|
|
} else { |
| 930 |
|
|
buf.WriteString("</a>") |
| 931 |
|
|
} |
| 932 |
|
|
return GoToNext |
| 933 |
|
|
} |
| 934 |
|
|
|
| 935 |
|
|
if inHeading { |
| 936 |
|
|
return r.RenderNode(&buf, node, entering) |
| 937 |
|
|
} |
| 938 |
|
|
|
| 939 |
|
|
return GoToNext |
| 940 |
|
|
}) |
| 941 |
|
|
|
| 942 |
|
|
for ; tocLevel > 0; tocLevel-- { |
| 943 |
|
|
buf.WriteString("</li>\n</ul>") |
| 944 |
|
|
} |
| 945 |
|
|
|
| 946 |
|
|
if buf.Len() > 0 { |
| 947 |
|
|
io.WriteString(w, "<nav>\n") |
| 948 |
|
|
w.Write(buf.Bytes()) |
| 949 |
|
|
io.WriteString(w, "\n\n</nav>\n") |
| 950 |
|
|
} |
| 951 |
|
|
r.lastOutputLen = buf.Len() |
| 952 |
|
|
} |
