diff options
Diffstat (limited to 'vendor/github.com/russross/blackfriday/html.go')
| -rw-r--r-- | vendor/github.com/russross/blackfriday/html.go | 949 |
1 files changed, 0 insertions, 949 deletions
diff --git a/vendor/github.com/russross/blackfriday/html.go b/vendor/github.com/russross/blackfriday/html.go deleted file mode 100644 index 74e67ee8..00000000 --- a/vendor/github.com/russross/blackfriday/html.go +++ /dev/null @@ -1,949 +0,0 @@ -// -// Blackfriday Markdown Processor -// Available at http://github.com/russross/blackfriday -// -// Copyright © 2011 Russ Ross <russ@russross.com>. -// Distributed under the Simplified BSD License. -// See README.md for details. -// - -// -// -// HTML rendering backend -// -// - -package blackfriday - -import ( - "bytes" - "fmt" - "regexp" - "strconv" - "strings" -) - -// Html renderer configuration options. -const ( - HTML_SKIP_HTML = 1 << iota // skip preformatted HTML blocks - HTML_SKIP_STYLE // skip embedded <style> elements - HTML_SKIP_IMAGES // skip embedded images - HTML_SKIP_LINKS // skip all links - HTML_SAFELINK // only link to trusted protocols - HTML_NOFOLLOW_LINKS // only link with rel="nofollow" - HTML_NOREFERRER_LINKS // only link with rel="noreferrer" - HTML_HREF_TARGET_BLANK // add a blank target - HTML_TOC // generate a table of contents - HTML_OMIT_CONTENTS // skip the main contents (for a standalone table of contents) - HTML_COMPLETE_PAGE // generate a complete HTML page - HTML_USE_XHTML // generate XHTML output instead of HTML - HTML_USE_SMARTYPANTS // enable smart punctuation substitutions - HTML_SMARTYPANTS_FRACTIONS // enable smart fractions (with HTML_USE_SMARTYPANTS) - HTML_SMARTYPANTS_DASHES // enable smart dashes (with HTML_USE_SMARTYPANTS) - HTML_SMARTYPANTS_LATEX_DASHES // enable LaTeX-style dashes (with HTML_USE_SMARTYPANTS and HTML_SMARTYPANTS_DASHES) - HTML_SMARTYPANTS_ANGLED_QUOTES // enable angled double quotes (with HTML_USE_SMARTYPANTS) for double quotes rendering - HTML_FOOTNOTE_RETURN_LINKS // generate a link at the end of a footnote to return to the source -) - -var ( - alignments = []string{ - "left", - "right", - "center", - } - - // TODO: improve this regexp to catch all possible entities: - htmlEntity = regexp.MustCompile(`&[a-z]{2,5};`) -) - -type HtmlRendererParameters struct { - // Prepend this text to each relative URL. - AbsolutePrefix string - // Add this text to each footnote anchor, to ensure uniqueness. - FootnoteAnchorPrefix string - // Show this text inside the <a> tag for a footnote return link, if the - // HTML_FOOTNOTE_RETURN_LINKS flag is enabled. If blank, the string - // <sup>[return]</sup> is used. - FootnoteReturnLinkContents string - // If set, add this text to the front of each Header ID, to ensure - // uniqueness. - HeaderIDPrefix string - // If set, add this text to the back of each Header ID, to ensure uniqueness. - HeaderIDSuffix string -} - -// Html is a type that implements the Renderer interface for HTML output. -// -// Do not create this directly, instead use the HtmlRenderer function. -type Html struct { - flags int // HTML_* options - closeTag string // how to end singleton tags: either " />" or ">" - title string // document title - css string // optional css file url (used with HTML_COMPLETE_PAGE) - - parameters HtmlRendererParameters - - // table of contents data - tocMarker int - headerCount int - currentLevel int - toc *bytes.Buffer - - // Track header IDs to prevent ID collision in a single generation. - headerIDs map[string]int - - smartypants *smartypantsRenderer -} - -const ( - xhtmlClose = " />" - htmlClose = ">" -) - -// HtmlRenderer creates and configures an Html object, which -// satisfies the Renderer interface. -// -// flags is a set of HTML_* options ORed together. -// title is the title of the document, and css is a URL for the document's -// stylesheet. -// title and css are only used when HTML_COMPLETE_PAGE is selected. -func HtmlRenderer(flags int, title string, css string) Renderer { - return HtmlRendererWithParameters(flags, title, css, HtmlRendererParameters{}) -} - -func HtmlRendererWithParameters(flags int, title string, - css string, renderParameters HtmlRendererParameters) Renderer { - // configure the rendering engine - closeTag := htmlClose - if flags&HTML_USE_XHTML != 0 { - closeTag = xhtmlClose - } - - if renderParameters.FootnoteReturnLinkContents == "" { - renderParameters.FootnoteReturnLinkContents = `<sup>[return]</sup>` - } - - return &Html{ - flags: flags, - closeTag: closeTag, - title: title, - css: css, - parameters: renderParameters, - - headerCount: 0, - currentLevel: 0, - toc: new(bytes.Buffer), - - headerIDs: make(map[string]int), - - smartypants: smartypants(flags), - } -} - -// Using if statements is a bit faster than a switch statement. As the compiler -// improves, this should be unnecessary this is only worthwhile because -// attrEscape is the single largest CPU user in normal use. -// Also tried using map, but that gave a ~3x slowdown. -func escapeSingleChar(char byte) (string, bool) { - if char == '"' { - return """, true - } - if char == '&' { - return "&", true - } - if char == '<' { - return "<", true - } - if char == '>' { - return ">", true - } - return "", false -} - -func attrEscape(out *bytes.Buffer, src []byte) { - org := 0 - for i, ch := range src { - if entity, ok := escapeSingleChar(ch); ok { - if i > org { - // copy all the normal characters since the last escape - out.Write(src[org:i]) - } - org = i + 1 - out.WriteString(entity) - } - } - if org < len(src) { - out.Write(src[org:]) - } -} - -func entityEscapeWithSkip(out *bytes.Buffer, src []byte, skipRanges [][]int) { - end := 0 - for _, rang := range skipRanges { - attrEscape(out, src[end:rang[0]]) - out.Write(src[rang[0]:rang[1]]) - end = rang[1] - } - attrEscape(out, src[end:]) -} - -func (options *Html) GetFlags() int { - return options.flags -} - -func (options *Html) TitleBlock(out *bytes.Buffer, text []byte) { - text = bytes.TrimPrefix(text, []byte("% ")) - text = bytes.Replace(text, []byte("\n% "), []byte("\n"), -1) - out.WriteString("<h1 class=\"title\">") - out.Write(text) - out.WriteString("\n</h1>") -} - -func (options *Html) Header(out *bytes.Buffer, text func() bool, level int, id string) { - marker := out.Len() - doubleSpace(out) - - if id == "" && options.flags&HTML_TOC != 0 { - id = fmt.Sprintf("toc_%d", options.headerCount) - } - - if id != "" { - id = options.ensureUniqueHeaderID(id) - - if options.parameters.HeaderIDPrefix != "" { - id = options.parameters.HeaderIDPrefix + id - } - - if options.parameters.HeaderIDSuffix != "" { - id = id + options.parameters.HeaderIDSuffix - } - - out.WriteString(fmt.Sprintf("<h%d id=\"%s\">", level, id)) - } else { - out.WriteString(fmt.Sprintf("<h%d>", level)) - } - - tocMarker := out.Len() - if !text() { - out.Truncate(marker) - return - } - - // are we building a table of contents? - if options.flags&HTML_TOC != 0 { - options.TocHeaderWithAnchor(out.Bytes()[tocMarker:], level, id) - } - - out.WriteString(fmt.Sprintf("</h%d>\n", level)) -} - -func (options *Html) BlockHtml(out *bytes.Buffer, text []byte) { - if options.flags&HTML_SKIP_HTML != 0 { - return - } - - doubleSpace(out) - out.Write(text) - out.WriteByte('\n') -} - -func (options *Html) HRule(out *bytes.Buffer) { - doubleSpace(out) - out.WriteString("<hr") - out.WriteString(options.closeTag) - out.WriteByte('\n') -} - -func (options *Html) BlockCode(out *bytes.Buffer, text []byte, lang string) { - doubleSpace(out) - - // parse out the language names/classes - count := 0 - for _, elt := range strings.Fields(lang) { - if elt[0] == '.' { - elt = elt[1:] - } - if len(elt) == 0 { - continue - } - if count == 0 { - out.WriteString("<pre><code class=\"language-") - } else { - out.WriteByte(' ') - } - attrEscape(out, []byte(elt)) - count++ - } - - if count == 0 { - out.WriteString("<pre><code>") - } else { - out.WriteString("\">") - } - - attrEscape(out, text) - out.WriteString("</code></pre>\n") -} - -func (options *Html) BlockQuote(out *bytes.Buffer, text []byte) { - doubleSpace(out) - out.WriteString("<blockquote>\n") - out.Write(text) - out.WriteString("</blockquote>\n") -} - -func (options *Html) Table(out *bytes.Buffer, header []byte, body []byte, columnData []int) { - doubleSpace(out) - out.WriteString("<table>\n<thead>\n") - out.Write(header) - out.WriteString("</thead>\n\n<tbody>\n") - out.Write(body) - out.WriteString("</tbody>\n</table>\n") -} - -func (options *Html) TableRow(out *bytes.Buffer, text []byte) { - doubleSpace(out) - out.WriteString("<tr>\n") - out.Write(text) - out.WriteString("\n</tr>\n") -} - -func (options *Html) TableHeaderCell(out *bytes.Buffer, text []byte, align int) { - doubleSpace(out) - switch align { - case TABLE_ALIGNMENT_LEFT: - out.WriteString("<th align=\"left\">") - case TABLE_ALIGNMENT_RIGHT: - out.WriteString("<th align=\"right\">") - case TABLE_ALIGNMENT_CENTER: - out.WriteString("<th align=\"center\">") - default: - out.WriteString("<th>") - } - - out.Write(text) - out.WriteString("</th>") -} - -func (options *Html) TableCell(out *bytes.Buffer, text []byte, align int) { - doubleSpace(out) - switch align { - case TABLE_ALIGNMENT_LEFT: - out.WriteString("<td align=\"left\">") - case TABLE_ALIGNMENT_RIGHT: - out.WriteString("<td align=\"right\">") - case TABLE_ALIGNMENT_CENTER: - out.WriteString("<td align=\"center\">") - default: - out.WriteString("<td>") - } - - out.Write(text) - out.WriteString("</td>") -} - -func (options *Html) Footnotes(out *bytes.Buffer, text func() bool) { - out.WriteString("<div class=\"footnotes\">\n") - options.HRule(out) - options.List(out, text, LIST_TYPE_ORDERED) - out.WriteString("</div>\n") -} - -func (options *Html) FootnoteItem(out *bytes.Buffer, name, text []byte, flags int) { - if flags&LIST_ITEM_CONTAINS_BLOCK != 0 || flags&LIST_ITEM_BEGINNING_OF_LIST != 0 { - doubleSpace(out) - } - slug := slugify(name) - out.WriteString(`<li id="`) - out.WriteString(`fn:`) - out.WriteString(options.parameters.FootnoteAnchorPrefix) - out.Write(slug) - out.WriteString(`">`) - out.Write(text) - if options.flags&HTML_FOOTNOTE_RETURN_LINKS != 0 { - out.WriteString(` <a class="footnote-return" href="#`) - out.WriteString(`fnref:`) - out.WriteString(options.parameters.FootnoteAnchorPrefix) - out.Write(slug) - out.WriteString(`">`) - out.WriteString(options.parameters.FootnoteReturnLinkContents) - out.WriteString(`</a>`) - } - out.WriteString("</li>\n") -} - -func (options *Html) List(out *bytes.Buffer, text func() bool, flags int) { - marker := out.Len() - doubleSpace(out) - - if flags&LIST_TYPE_DEFINITION != 0 { - out.WriteString("<dl>") - } else if flags&LIST_TYPE_ORDERED != 0 { - out.WriteString("<ol>") - } else { - out.WriteString("<ul>") - } - if !text() { - out.Truncate(marker) - return - } - if flags&LIST_TYPE_DEFINITION != 0 { - out.WriteString("</dl>\n") - } else if flags&LIST_TYPE_ORDERED != 0 { - out.WriteString("</ol>\n") - } else { - out.WriteString("</ul>\n") - } -} - -func (options *Html) ListItem(out *bytes.Buffer, text []byte, flags int) { - if (flags&LIST_ITEM_CONTAINS_BLOCK != 0 && flags&LIST_TYPE_DEFINITION == 0) || - flags&LIST_ITEM_BEGINNING_OF_LIST != 0 { - doubleSpace(out) - } - if flags&LIST_TYPE_TERM != 0 { - out.WriteString("<dt>") - } else if flags&LIST_TYPE_DEFINITION != 0 { - out.WriteString("<dd>") - } else { - out.WriteString("<li>") - } - out.Write(text) - if flags&LIST_TYPE_TERM != 0 { - out.WriteString("</dt>\n") - } else if flags&LIST_TYPE_DEFINITION != 0 { - out.WriteString("</dd>\n") - } else { - out.WriteString("</li>\n") - } -} - -func (options *Html) Paragraph(out *bytes.Buffer, text func() bool) { - marker := out.Len() - doubleSpace(out) - - out.WriteString("<p>") - if !text() { - out.Truncate(marker) - return - } - out.WriteString("</p>\n") -} - -func (options *Html) AutoLink(out *bytes.Buffer, link []byte, kind int) { - skipRanges := htmlEntity.FindAllIndex(link, -1) - if options.flags&HTML_SAFELINK != 0 && !isSafeLink(link) && kind != LINK_TYPE_EMAIL { - // mark it but don't link it if it is not a safe link: no smartypants - out.WriteString("<tt>") - entityEscapeWithSkip(out, link, skipRanges) - out.WriteString("</tt>") - return - } - - out.WriteString("<a href=\"") - if kind == LINK_TYPE_EMAIL { - out.WriteString("mailto:") - } else { - options.maybeWriteAbsolutePrefix(out, link) - } - - entityEscapeWithSkip(out, link, skipRanges) - - var relAttrs []string - if options.flags&HTML_NOFOLLOW_LINKS != 0 && !isRelativeLink(link) { - relAttrs = append(relAttrs, "nofollow") - } - if options.flags&HTML_NOREFERRER_LINKS != 0 && !isRelativeLink(link) { - relAttrs = append(relAttrs, "noreferrer") - } - if len(relAttrs) > 0 { - out.WriteString(fmt.Sprintf("\" rel=\"%s", strings.Join(relAttrs, " "))) - } - - // blank target only add to external link - if options.flags&HTML_HREF_TARGET_BLANK != 0 && !isRelativeLink(link) { - out.WriteString("\" target=\"_blank") - } - - out.WriteString("\">") - - // Pretty print: if we get an email address as - // an actual URI, e.g. `mailto:foo@bar.com`, we don't - // want to print the `mailto:` prefix - switch { - case bytes.HasPrefix(link, []byte("mailto://")): - attrEscape(out, link[len("mailto://"):]) - case bytes.HasPrefix(link, []byte("mailto:")): - attrEscape(out, link[len("mailto:"):]) - default: - entityEscapeWithSkip(out, link, skipRanges) - } - - out.WriteString("</a>") -} - -func (options *Html) CodeSpan(out *bytes.Buffer, text []byte) { - out.WriteString("<code>") - attrEscape(out, text) - out.WriteString("</code>") -} - -func (options *Html) DoubleEmphasis(out *bytes.Buffer, text []byte) { - out.WriteString("<strong>") - out.Write(text) - out.WriteString("</strong>") -} - -func (options *Html) Emphasis(out *bytes.Buffer, text []byte) { - if len(text) == 0 { - return - } - out.WriteString("<em>") - out.Write(text) - out.WriteString("</em>") -} - -func (options *Html) maybeWriteAbsolutePrefix(out *bytes.Buffer, link []byte) { - if options.parameters.AbsolutePrefix != "" && isRelativeLink(link) && link[0] != '.' { - out.WriteString(options.parameters.AbsolutePrefix) - if link[0] != '/' { - out.WriteByte('/') - } - } -} - -func (options *Html) Image(out *bytes.Buffer, link []byte, title []byte, alt []byte) { - if options.flags&HTML_SKIP_IMAGES != 0 { - return - } - - out.WriteString("<img src=\"") - options.maybeWriteAbsolutePrefix(out, link) - attrEscape(out, link) - out.WriteString("\" alt=\"") - if len(alt) > 0 { - attrEscape(out, alt) - } - if len(title) > 0 { - out.WriteString("\" title=\"") - attrEscape(out, title) - } - - out.WriteByte('"') - out.WriteString(options.closeTag) -} - -func (options *Html) LineBreak(out *bytes.Buffer) { - out.WriteString("<br") - out.WriteString(options.closeTag) - out.WriteByte('\n') -} - -func (options *Html) Link(out *bytes.Buffer, link []byte, title []byte, content []byte) { - if options.flags&HTML_SKIP_LINKS != 0 { - // write the link text out but don't link it, just mark it with typewriter font - out.WriteString("<tt>") - attrEscape(out, content) - out.WriteString("</tt>") - return - } - - if options.flags&HTML_SAFELINK != 0 && !isSafeLink(link) { - // write the link text out but don't link it, just mark it with typewriter font - out.WriteString("<tt>") - attrEscape(out, content) - out.WriteString("</tt>") - return - } - - out.WriteString("<a href=\"") - options.maybeWriteAbsolutePrefix(out, link) - attrEscape(out, link) - if len(title) > 0 { - out.WriteString("\" title=\"") - attrEscape(out, title) - } - var relAttrs []string - if options.flags&HTML_NOFOLLOW_LINKS != 0 && !isRelativeLink(link) { - relAttrs = append(relAttrs, "nofollow") - } - if options.flags&HTML_NOREFERRER_LINKS != 0 && !isRelativeLink(link) { - relAttrs = append(relAttrs, "noreferrer") - } - if len(relAttrs) > 0 { - out.WriteString(fmt.Sprintf("\" rel=\"%s", strings.Join(relAttrs, " "))) - } - - // blank target only add to external link - if options.flags&HTML_HREF_TARGET_BLANK != 0 && !isRelativeLink(link) { - out.WriteString("\" target=\"_blank") - } - - out.WriteString("\">") - out.Write(content) - out.WriteString("</a>") - return -} - -func (options *Html) RawHtmlTag(out *bytes.Buffer, text []byte) { - if options.flags&HTML_SKIP_HTML != 0 { - return - } - if options.flags&HTML_SKIP_STYLE != 0 && isHtmlTag(text, "style") { - return - } - if options.flags&HTML_SKIP_LINKS != 0 && isHtmlTag(text, "a") { - return - } - if options.flags&HTML_SKIP_IMAGES != 0 && isHtmlTag(text, "img") { - return - } - out.Write(text) -} - -func (options *Html) TripleEmphasis(out *bytes.Buffer, text []byte) { - out.WriteString("<strong><em>") - out.Write(text) - out.WriteString("</em></strong>") -} - -func (options *Html) StrikeThrough(out *bytes.Buffer, text []byte) { - out.WriteString("<del>") - out.Write(text) - out.WriteString("</del>") -} - -func (options *Html) FootnoteRef(out *bytes.Buffer, ref []byte, id int) { - slug := slugify(ref) - out.WriteString(`<sup class="footnote-ref" id="`) - out.WriteString(`fnref:`) - out.WriteString(options.parameters.FootnoteAnchorPrefix) - out.Write(slug) - out.WriteString(`"><a rel="footnote" href="#`) - out.WriteString(`fn:`) - out.WriteString(options.parameters.FootnoteAnchorPrefix) - out.Write(slug) - out.WriteString(`">`) - out.WriteString(strconv.Itoa(id)) - out.WriteString(`</a></sup>`) -} - -func (options *Html) Entity(out *bytes.Buffer, entity []byte) { - out.Write(entity) -} - -func (options *Html) NormalText(out *bytes.Buffer, text []byte) { - if options.flags&HTML_USE_SMARTYPANTS != 0 { - options.Smartypants(out, text) - } else { - attrEscape(out, text) - } -} - -func (options *Html) Smartypants(out *bytes.Buffer, text []byte) { - smrt := smartypantsData{false, false} - - // first do normal entity escaping - var escaped bytes.Buffer - attrEscape(&escaped, text) - text = escaped.Bytes() - - mark := 0 - for i := 0; i < len(text); i++ { - if action := options.smartypants[text[i]]; action != nil { - if i > mark { - out.Write(text[mark:i]) - } - - previousChar := byte(0) - if i > 0 { - previousChar = text[i-1] - } - i += action(out, &smrt, previousChar, text[i:]) - mark = i + 1 - } - } - - if mark < len(text) { - out.Write(text[mark:]) - } -} - -func (options *Html) DocumentHeader(out *bytes.Buffer) { - if options.flags&HTML_COMPLETE_PAGE == 0 { - return - } - - ending := "" - if options.flags&HTML_USE_XHTML != 0 { - out.WriteString("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" ") - out.WriteString("\"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n") - out.WriteString("<html xmlns=\"http://www.w3.org/1999/xhtml\">\n") - ending = " /" - } else { - out.WriteString("<!DOCTYPE html>\n") - out.WriteString("<html>\n") - } - out.WriteString("<head>\n") - out.WriteString(" <title>") - options.NormalText(out, []byte(options.title)) - out.WriteString("</title>\n") - out.WriteString(" <meta name=\"GENERATOR\" content=\"Blackfriday Markdown Processor v") - out.WriteString(VERSION) - out.WriteString("\"") - out.WriteString(ending) - out.WriteString(">\n") - out.WriteString(" <meta charset=\"utf-8\"") - out.WriteString(ending) - out.WriteString(">\n") - if options.css != "" { - out.WriteString(" <link rel=\"stylesheet\" type=\"text/css\" href=\"") - attrEscape(out, []byte(options.css)) - out.WriteString("\"") - out.WriteString(ending) - out.WriteString(">\n") - } - out.WriteString("</head>\n") - out.WriteString("<body>\n") - - options.tocMarker = out.Len() -} - -func (options *Html) DocumentFooter(out *bytes.Buffer) { - // finalize and insert the table of contents - if options.flags&HTML_TOC != 0 { - options.TocFinalize() - - // now we have to insert the table of contents into the document - var temp bytes.Buffer - - // start by making a copy of everything after the document header - temp.Write(out.Bytes()[options.tocMarker:]) - - // now clear the copied material from the main output buffer - out.Truncate(options.tocMarker) - - // corner case spacing issue - if options.flags&HTML_COMPLETE_PAGE != 0 { - out.WriteByte('\n') - } - - // insert the table of contents - out.WriteString("<nav>\n") - out.Write(options.toc.Bytes()) - out.WriteString("</nav>\n") - - // corner case spacing issue - if options.flags&HTML_COMPLETE_PAGE == 0 && options.flags&HTML_OMIT_CONTENTS == 0 { - out.WriteByte('\n') - } - - // write out everything that came after it - if options.flags&HTML_OMIT_CONTENTS == 0 { - out.Write(temp.Bytes()) - } - } - - if options.flags&HTML_COMPLETE_PAGE != 0 { - out.WriteString("\n</body>\n") - out.WriteString("</html>\n") - } - -} - -func (options *Html) TocHeaderWithAnchor(text []byte, level int, anchor string) { - for level > options.currentLevel { - switch { - case bytes.HasSuffix(options.toc.Bytes(), []byte("</li>\n")): - // this sublist can nest underneath a header - size := options.toc.Len() - options.toc.Truncate(size - len("</li>\n")) - - case options.currentLevel > 0: - options.toc.WriteString("<li>") - } - if options.toc.Len() > 0 { - options.toc.WriteByte('\n') - } - options.toc.WriteString("<ul>\n") - options.currentLevel++ - } - - for level < options.currentLevel { - options.toc.WriteString("</ul>") - if options.currentLevel > 1 { - options.toc.WriteString("</li>\n") - } - options.currentLevel-- - } - - options.toc.WriteString("<li><a href=\"#") - if anchor != "" { - options.toc.WriteString(anchor) - } else { - options.toc.WriteString("toc_") - options.toc.WriteString(strconv.Itoa(options.headerCount)) - } - options.toc.WriteString("\">") - options.headerCount++ - - options.toc.Write(text) - - options.toc.WriteString("</a></li>\n") -} - -func (options *Html) TocHeader(text []byte, level int) { - options.TocHeaderWithAnchor(text, level, "") -} - -func (options *Html) TocFinalize() { - for options.currentLevel > 1 { - options.toc.WriteString("</ul></li>\n") - options.currentLevel-- - } - - if options.currentLevel > 0 { - options.toc.WriteString("</ul>\n") - } -} - -func isHtmlTag(tag []byte, tagname string) bool { - found, _ := findHtmlTagPos(tag, tagname) - return found -} - -// Look for a character, but ignore it when it's in any kind of quotes, it -// might be JavaScript -func skipUntilCharIgnoreQuotes(html []byte, start int, char byte) int { - inSingleQuote := false - inDoubleQuote := false - inGraveQuote := false - i := start - for i < len(html) { - switch { - case html[i] == char && !inSingleQuote && !inDoubleQuote && !inGraveQuote: - return i - case html[i] == '\'': - inSingleQuote = !inSingleQuote - case html[i] == '"': - inDoubleQuote = !inDoubleQuote - case html[i] == '`': - inGraveQuote = !inGraveQuote - } - i++ - } - return start -} - -func findHtmlTagPos(tag []byte, tagname string) (bool, int) { - i := 0 - if i < len(tag) && tag[0] != '<' { - return false, -1 - } - i++ - i = skipSpace(tag, i) - - if i < len(tag) && tag[i] == '/' { - i++ - } - - i = skipSpace(tag, i) - j := 0 - for ; i < len(tag); i, j = i+1, j+1 { - if j >= len(tagname) { - break - } - - if strings.ToLower(string(tag[i]))[0] != tagname[j] { - return false, -1 - } - } - - if i == len(tag) { - return false, -1 - } - - rightAngle := skipUntilCharIgnoreQuotes(tag, i, '>') - if rightAngle > i { - return true, rightAngle - } - - return false, -1 -} - -func skipUntilChar(text []byte, start int, char byte) int { - i := start - for i < len(text) && text[i] != char { - i++ - } - return i -} - -func skipSpace(tag []byte, i int) int { - for i < len(tag) && isspace(tag[i]) { - i++ - } - return i -} - -func skipChar(data []byte, start int, char byte) int { - i := start - for i < len(data) && data[i] == char { - i++ - } - return i -} - -func doubleSpace(out *bytes.Buffer) { - if out.Len() > 0 { - out.WriteByte('\n') - } -} - -func isRelativeLink(link []byte) (yes bool) { - // a tag begin with '#' - if link[0] == '#' { - return true - } - - // link begin with '/' but not '//', the second maybe a protocol relative link - if len(link) >= 2 && link[0] == '/' && link[1] != '/' { - return true - } - - // only the root '/' - if len(link) == 1 && link[0] == '/' { - return true - } - - // current directory : begin with "./" - if bytes.HasPrefix(link, []byte("./")) { - return true - } - - // parent directory : begin with "../" - if bytes.HasPrefix(link, []byte("../")) { - return true - } - - return false -} - -func (options *Html) ensureUniqueHeaderID(id string) string { - for count, found := options.headerIDs[id]; found; count, found = options.headerIDs[id] { - tmp := fmt.Sprintf("%s-%d", id, count+1) - - if _, tmpFound := options.headerIDs[tmp]; !tmpFound { - options.headerIDs[id] = count + 1 - id = tmp - } else { - id = id + "-1" - } - } - - if _, found := options.headerIDs[id]; !found { - options.headerIDs[id] = 0 - } - - return id -} |