How to use Options method of html Package

Best K6 code snippet using html.Options

html.go

Source:html.go Github

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1//2// Blackfriday Markdown Processor3// Available at http://github.com/russross/blackfriday4//5// Copyright © 2011 Russ Ross <russ@russross.com>.6// Distributed under the Simplified BSD License.7// See README.md for details.8//9//10//11// HTML rendering backend12//13//14package blackfriday15import (16 "bytes"17 "fmt"18 "regexp"19 "strconv"20 "strings"21)22// Html renderer configuration options.23const (24 HTML_SKIP_HTML = 1 << iota // skip preformatted HTML blocks25 HTML_SKIP_STYLE // skip embedded <style> elements26 HTML_SKIP_IMAGES // skip embedded images27 HTML_SKIP_LINKS // skip all links28 HTML_SAFELINK // only link to trusted protocols29 HTML_NOFOLLOW_LINKS // only link with rel="nofollow"30 HTML_NOREFERRER_LINKS // only link with rel="noreferrer"31 HTML_HREF_TARGET_BLANK // add a blank target32 HTML_TOC // generate a table of contents33 HTML_OMIT_CONTENTS // skip the main contents (for a standalone table of contents)34 HTML_COMPLETE_PAGE // generate a complete HTML page35 HTML_USE_XHTML // generate XHTML output instead of HTML36 HTML_USE_SMARTYPANTS // enable smart punctuation substitutions37 HTML_SMARTYPANTS_FRACTIONS // enable smart fractions (with HTML_USE_SMARTYPANTS)38 HTML_SMARTYPANTS_DASHES // enable smart dashes (with HTML_USE_SMARTYPANTS)39 HTML_SMARTYPANTS_LATEX_DASHES // enable LaTeX-style dashes (with HTML_USE_SMARTYPANTS and HTML_SMARTYPANTS_DASHES)40 HTML_SMARTYPANTS_ANGLED_QUOTES // enable angled double quotes (with HTML_USE_SMARTYPANTS) for double quotes rendering41 HTML_SMARTYPANTS_QUOTES_NBSP // enable "French guillemets" (with HTML_USE_SMARTYPANTS)42 HTML_FOOTNOTE_RETURN_LINKS // generate a link at the end of a footnote to return to the source43)44var (45 alignments = []string{46 "left",47 "right",48 "center",49 }50 // TODO: improve this regexp to catch all possible entities:51 htmlEntity = regexp.MustCompile(`&[a-z]{2,5};`)52)53type HtmlRendererParameters struct {54 // Prepend this text to each relative URL.55 AbsolutePrefix string56 // Add this text to each footnote anchor, to ensure uniqueness.57 FootnoteAnchorPrefix string58 // Show this text inside the <a> tag for a footnote return link, if the59 // HTML_FOOTNOTE_RETURN_LINKS flag is enabled. If blank, the string60 // <sup>[return]</sup> is used.61 FootnoteReturnLinkContents string62 // If set, add this text to the front of each Header ID, to ensure63 // uniqueness.64 HeaderIDPrefix string65 // If set, add this text to the back of each Header ID, to ensure uniqueness.66 HeaderIDSuffix string67}68// Html is a type that implements the Renderer interface for HTML output.69//70// Do not create this directly, instead use the HtmlRenderer function.71type Html struct {72 flags int // HTML_* options73 closeTag string // how to end singleton tags: either " />" or ">"74 title string // document title75 css string // optional css file url (used with HTML_COMPLETE_PAGE)76 parameters HtmlRendererParameters77 // table of contents data78 tocMarker int79 headerCount int80 currentLevel int81 toc *bytes.Buffer82 // Track header IDs to prevent ID collision in a single generation.83 headerIDs map[string]int84 smartypants *smartypantsRenderer85}86const (87 xhtmlClose = " />"88 htmlClose = ">"89)90// HtmlRenderer creates and configures an Html object, which91// satisfies the Renderer interface.92//93// flags is a set of HTML_* options ORed together.94// title is the title of the document, and css is a URL for the document's95// stylesheet.96// title and css are only used when HTML_COMPLETE_PAGE is selected.97func HtmlRenderer(flags int, title string, css string) Renderer {98 return HtmlRendererWithParameters(flags, title, css, HtmlRendererParameters{})99}100func HtmlRendererWithParameters(flags int, title string,101 css string, renderParameters HtmlRendererParameters) Renderer {102 // configure the rendering engine103 closeTag := htmlClose104 if flags&HTML_USE_XHTML != 0 {105 closeTag = xhtmlClose106 }107 if renderParameters.FootnoteReturnLinkContents == "" {108 renderParameters.FootnoteReturnLinkContents = `<sup>[return]</sup>`109 }110 return &Html{111 flags: flags,112 closeTag: closeTag,113 title: title,114 css: css,115 parameters: renderParameters,116 headerCount: 0,117 currentLevel: 0,118 toc: new(bytes.Buffer),119 headerIDs: make(map[string]int),120 smartypants: smartypants(flags),121 }122}123// Using if statements is a bit faster than a switch statement. As the compiler124// improves, this should be unnecessary this is only worthwhile because125// attrEscape is the single largest CPU user in normal use.126// Also tried using map, but that gave a ~3x slowdown.127func escapeSingleChar(char byte) (string, bool) {128 if char == '"' {129 return "&quot;", true130 }131 if char == '&' {132 return "&amp;", true133 }134 if char == '<' {135 return "&lt;", true136 }137 if char == '>' {138 return "&gt;", true139 }140 return "", false141}142func attrEscape(out *bytes.Buffer, src []byte) {143 org := 0144 for i, ch := range src {145 if entity, ok := escapeSingleChar(ch); ok {146 if i > org {147 // copy all the normal characters since the last escape148 out.Write(src[org:i])149 }150 org = i + 1151 out.WriteString(entity)152 }153 }154 if org < len(src) {155 out.Write(src[org:])156 }157}158func entityEscapeWithSkip(out *bytes.Buffer, src []byte, skipRanges [][]int) {159 end := 0160 for _, rang := range skipRanges {161 attrEscape(out, src[end:rang[0]])162 out.Write(src[rang[0]:rang[1]])163 end = rang[1]164 }165 attrEscape(out, src[end:])166}167func (options *Html) GetFlags() int {168 return options.flags169}170func (options *Html) TitleBlock(out *bytes.Buffer, text []byte) {171 text = bytes.TrimPrefix(text, []byte("% "))172 text = bytes.Replace(text, []byte("\n% "), []byte("\n"), -1)173 out.WriteString("<h1 class=\"title\">")174 out.Write(text)175 out.WriteString("\n</h1>")176}177func (options *Html) Header(out *bytes.Buffer, text func() bool, level int, id string) {178 marker := out.Len()179 doubleSpace(out)180 if id == "" && options.flags&HTML_TOC != 0 {181 id = fmt.Sprintf("toc_%d", options.headerCount)182 }183 if id != "" {184 id = options.ensureUniqueHeaderID(id)185 if options.parameters.HeaderIDPrefix != "" {186 id = options.parameters.HeaderIDPrefix + id187 }188 if options.parameters.HeaderIDSuffix != "" {189 id = id + options.parameters.HeaderIDSuffix190 }191 out.WriteString(fmt.Sprintf("<h%d id=\"%s\">", level, id))192 } else {193 out.WriteString(fmt.Sprintf("<h%d>", level))194 }195 tocMarker := out.Len()196 if !text() {197 out.Truncate(marker)198 return199 }200 // are we building a table of contents?201 if options.flags&HTML_TOC != 0 {202 options.TocHeaderWithAnchor(out.Bytes()[tocMarker:], level, id)203 }204 out.WriteString(fmt.Sprintf("</h%d>\n", level))205}206func (options *Html) BlockHtml(out *bytes.Buffer, text []byte) {207 if options.flags&HTML_SKIP_HTML != 0 {208 return209 }210 doubleSpace(out)211 out.Write(text)212 out.WriteByte('\n')213}214func (options *Html) HRule(out *bytes.Buffer) {215 doubleSpace(out)216 out.WriteString("<hr")217 out.WriteString(options.closeTag)218 out.WriteByte('\n')219}220func (options *Html) BlockCode(out *bytes.Buffer, text []byte, info string) {221 doubleSpace(out)222 endOfLang := strings.IndexAny(info, "\t ")223 if endOfLang < 0 {224 endOfLang = len(info)225 }226 lang := info[:endOfLang]227 if len(lang) == 0 || lang == "." {228 out.WriteString("<pre><code>")229 } else {230 out.WriteString("<pre><code class=\"language-")231 attrEscape(out, []byte(lang))232 out.WriteString("\">")233 }234 attrEscape(out, text)235 out.WriteString("</code></pre>\n")236}237func (options *Html) BlockQuote(out *bytes.Buffer, text []byte) {238 doubleSpace(out)239 out.WriteString("<blockquote>\n")240 out.Write(text)241 out.WriteString("</blockquote>\n")242}243func (options *Html) Table(out *bytes.Buffer, header []byte, body []byte, columnData []int) {244 doubleSpace(out)245 out.WriteString("<table>\n<thead>\n")246 out.Write(header)247 out.WriteString("</thead>\n\n<tbody>\n")248 out.Write(body)249 out.WriteString("</tbody>\n</table>\n")250}251func (options *Html) TableRow(out *bytes.Buffer, text []byte) {252 doubleSpace(out)253 out.WriteString("<tr>\n")254 out.Write(text)255 out.WriteString("\n</tr>\n")256}257func (options *Html) TableHeaderCell(out *bytes.Buffer, text []byte, align int) {258 doubleSpace(out)259 switch align {260 case TABLE_ALIGNMENT_LEFT:261 out.WriteString("<th align=\"left\">")262 case TABLE_ALIGNMENT_RIGHT:263 out.WriteString("<th align=\"right\">")264 case TABLE_ALIGNMENT_CENTER:265 out.WriteString("<th align=\"center\">")266 default:267 out.WriteString("<th>")268 }269 out.Write(text)270 out.WriteString("</th>")271}272func (options *Html) TableCell(out *bytes.Buffer, text []byte, align int) {273 doubleSpace(out)274 switch align {275 case TABLE_ALIGNMENT_LEFT:276 out.WriteString("<td align=\"left\">")277 case TABLE_ALIGNMENT_RIGHT:278 out.WriteString("<td align=\"right\">")279 case TABLE_ALIGNMENT_CENTER:280 out.WriteString("<td align=\"center\">")281 default:282 out.WriteString("<td>")283 }284 out.Write(text)285 out.WriteString("</td>")286}287func (options *Html) Footnotes(out *bytes.Buffer, text func() bool) {288 out.WriteString("<div class=\"footnotes\">\n")289 options.HRule(out)290 options.List(out, text, LIST_TYPE_ORDERED)291 out.WriteString("</div>\n")292}293func (options *Html) FootnoteItem(out *bytes.Buffer, name, text []byte, flags int) {294 if flags&LIST_ITEM_CONTAINS_BLOCK != 0 || flags&LIST_ITEM_BEGINNING_OF_LIST != 0 {295 doubleSpace(out)296 }297 slug := slugify(name)298 out.WriteString(`<li id="`)299 out.WriteString(`fn:`)300 out.WriteString(options.parameters.FootnoteAnchorPrefix)301 out.Write(slug)302 out.WriteString(`">`)303 out.Write(text)304 if options.flags&HTML_FOOTNOTE_RETURN_LINKS != 0 {305 out.WriteString(` <a class="footnote-return" href="#`)306 out.WriteString(`fnref:`)307 out.WriteString(options.parameters.FootnoteAnchorPrefix)308 out.Write(slug)309 out.WriteString(`">`)310 out.WriteString(options.parameters.FootnoteReturnLinkContents)311 out.WriteString(`</a>`)312 }313 out.WriteString("</li>\n")314}315func (options *Html) List(out *bytes.Buffer, text func() bool, flags int) {316 marker := out.Len()317 doubleSpace(out)318 if flags&LIST_TYPE_DEFINITION != 0 {319 out.WriteString("<dl>")320 } else if flags&LIST_TYPE_ORDERED != 0 {321 out.WriteString("<ol>")322 } else {323 out.WriteString("<ul>")324 }325 if !text() {326 out.Truncate(marker)327 return328 }329 if flags&LIST_TYPE_DEFINITION != 0 {330 out.WriteString("</dl>\n")331 } else if flags&LIST_TYPE_ORDERED != 0 {332 out.WriteString("</ol>\n")333 } else {334 out.WriteString("</ul>\n")335 }336}337func (options *Html) ListItem(out *bytes.Buffer, text []byte, flags int) {338 if (flags&LIST_ITEM_CONTAINS_BLOCK != 0 && flags&LIST_TYPE_DEFINITION == 0) ||339 flags&LIST_ITEM_BEGINNING_OF_LIST != 0 {340 doubleSpace(out)341 }342 if flags&LIST_TYPE_TERM != 0 {343 out.WriteString("<dt>")344 } else if flags&LIST_TYPE_DEFINITION != 0 {345 out.WriteString("<dd>")346 } else {347 out.WriteString("<li>")348 }349 out.Write(text)350 if flags&LIST_TYPE_TERM != 0 {351 out.WriteString("</dt>\n")352 } else if flags&LIST_TYPE_DEFINITION != 0 {353 out.WriteString("</dd>\n")354 } else {355 out.WriteString("</li>\n")356 }357}358func (options *Html) Paragraph(out *bytes.Buffer, text func() bool) {359 marker := out.Len()360 doubleSpace(out)361 out.WriteString("<p>")362 if !text() {363 out.Truncate(marker)364 return365 }366 out.WriteString("</p>\n")367}368func (options *Html) AutoLink(out *bytes.Buffer, link []byte, kind int) {369 skipRanges := htmlEntity.FindAllIndex(link, -1)370 if options.flags&HTML_SAFELINK != 0 && !isSafeLink(link) && kind != LINK_TYPE_EMAIL {371 // mark it but don't link it if it is not a safe link: no smartypants372 out.WriteString("<tt>")373 entityEscapeWithSkip(out, link, skipRanges)374 out.WriteString("</tt>")375 return376 }377 out.WriteString("<a href=\"")378 if kind == LINK_TYPE_EMAIL {379 out.WriteString("mailto:")380 } else {381 options.maybeWriteAbsolutePrefix(out, link)382 }383 entityEscapeWithSkip(out, link, skipRanges)384 var relAttrs []string385 if options.flags&HTML_NOFOLLOW_LINKS != 0 && !isRelativeLink(link) {386 relAttrs = append(relAttrs, "nofollow")387 }388 if options.flags&HTML_NOREFERRER_LINKS != 0 && !isRelativeLink(link) {389 relAttrs = append(relAttrs, "noreferrer")390 }391 if len(relAttrs) > 0 {392 out.WriteString(fmt.Sprintf("\" rel=\"%s", strings.Join(relAttrs, " ")))393 }394 // blank target only add to external link395 if options.flags&HTML_HREF_TARGET_BLANK != 0 && !isRelativeLink(link) {396 out.WriteString("\" target=\"_blank")397 }398 out.WriteString("\">")399 // Pretty print: if we get an email address as400 // an actual URI, e.g. `mailto:foo@bar.com`, we don't401 // want to print the `mailto:` prefix402 switch {403 case bytes.HasPrefix(link, []byte("mailto://")):404 attrEscape(out, link[len("mailto://"):])405 case bytes.HasPrefix(link, []byte("mailto:")):406 attrEscape(out, link[len("mailto:"):])407 default:408 entityEscapeWithSkip(out, link, skipRanges)409 }410 out.WriteString("</a>")411}412func (options *Html) CodeSpan(out *bytes.Buffer, text []byte) {413 out.WriteString("<code>")414 attrEscape(out, text)415 out.WriteString("</code>")416}417func (options *Html) DoubleEmphasis(out *bytes.Buffer, text []byte) {418 out.WriteString("<strong>")419 out.Write(text)420 out.WriteString("</strong>")421}422func (options *Html) Emphasis(out *bytes.Buffer, text []byte) {423 if len(text) == 0 {424 return425 }426 out.WriteString("<em>")427 out.Write(text)428 out.WriteString("</em>")429}430func (options *Html) maybeWriteAbsolutePrefix(out *bytes.Buffer, link []byte) {431 if options.parameters.AbsolutePrefix != "" && isRelativeLink(link) && link[0] != '.' {432 out.WriteString(options.parameters.AbsolutePrefix)433 if link[0] != '/' {434 out.WriteByte('/')435 }436 }437}438func (options *Html) Image(out *bytes.Buffer, link []byte, title []byte, alt []byte) {439 if options.flags&HTML_SKIP_IMAGES != 0 {440 return441 }442 out.WriteString("<img src=\"")443 options.maybeWriteAbsolutePrefix(out, link)444 attrEscape(out, link)445 out.WriteString("\" alt=\"")446 if len(alt) > 0 {447 attrEscape(out, alt)448 }449 if len(title) > 0 {450 out.WriteString("\" title=\"")451 attrEscape(out, title)452 }453 out.WriteByte('"')454 out.WriteString(options.closeTag)455}456func (options *Html) LineBreak(out *bytes.Buffer) {457 out.WriteString("<br")458 out.WriteString(options.closeTag)459 out.WriteByte('\n')460}461func (options *Html) Link(out *bytes.Buffer, link []byte, title []byte, content []byte) {462 if options.flags&HTML_SKIP_LINKS != 0 {463 // write the link text out but don't link it, just mark it with typewriter font464 out.WriteString("<tt>")465 attrEscape(out, content)466 out.WriteString("</tt>")467 return468 }469 if options.flags&HTML_SAFELINK != 0 && !isSafeLink(link) {470 // write the link text out but don't link it, just mark it with typewriter font471 out.WriteString("<tt>")472 attrEscape(out, content)473 out.WriteString("</tt>")474 return475 }476 out.WriteString("<a href=\"")477 options.maybeWriteAbsolutePrefix(out, link)478 attrEscape(out, link)479 if len(title) > 0 {480 out.WriteString("\" title=\"")481 attrEscape(out, title)482 }483 var relAttrs []string484 if options.flags&HTML_NOFOLLOW_LINKS != 0 && !isRelativeLink(link) {485 relAttrs = append(relAttrs, "nofollow")486 }487 if options.flags&HTML_NOREFERRER_LINKS != 0 && !isRelativeLink(link) {488 relAttrs = append(relAttrs, "noreferrer")489 }490 if len(relAttrs) > 0 {491 out.WriteString(fmt.Sprintf("\" rel=\"%s", strings.Join(relAttrs, " ")))492 }493 // blank target only add to external link494 if options.flags&HTML_HREF_TARGET_BLANK != 0 && !isRelativeLink(link) {495 out.WriteString("\" target=\"_blank")496 }497 out.WriteString("\">")498 out.Write(content)499 out.WriteString("</a>")500 return501}502func (options *Html) RawHtmlTag(out *bytes.Buffer, text []byte) {503 if options.flags&HTML_SKIP_HTML != 0 {504 return505 }506 if options.flags&HTML_SKIP_STYLE != 0 && isHtmlTag(text, "style") {507 return508 }509 if options.flags&HTML_SKIP_LINKS != 0 && isHtmlTag(text, "a") {510 return511 }512 if options.flags&HTML_SKIP_IMAGES != 0 && isHtmlTag(text, "img") {513 return514 }515 out.Write(text)516}517func (options *Html) TripleEmphasis(out *bytes.Buffer, text []byte) {518 out.WriteString("<strong><em>")519 out.Write(text)520 out.WriteString("</em></strong>")521}522func (options *Html) StrikeThrough(out *bytes.Buffer, text []byte) {523 out.WriteString("<del>")524 out.Write(text)525 out.WriteString("</del>")526}527func (options *Html) FootnoteRef(out *bytes.Buffer, ref []byte, id int) {528 slug := slugify(ref)529 out.WriteString(`<sup class="footnote-ref" id="`)530 out.WriteString(`fnref:`)531 out.WriteString(options.parameters.FootnoteAnchorPrefix)532 out.Write(slug)533 out.WriteString(`"><a href="#`)534 out.WriteString(`fn:`)535 out.WriteString(options.parameters.FootnoteAnchorPrefix)536 out.Write(slug)537 out.WriteString(`">`)538 out.WriteString(strconv.Itoa(id))539 out.WriteString(`</a></sup>`)540}541func (options *Html) Entity(out *bytes.Buffer, entity []byte) {542 out.Write(entity)543}544func (options *Html) NormalText(out *bytes.Buffer, text []byte) {545 if options.flags&HTML_USE_SMARTYPANTS != 0 {546 options.Smartypants(out, text)547 } else {548 attrEscape(out, text)549 }550}551func (options *Html) Smartypants(out *bytes.Buffer, text []byte) {552 smrt := smartypantsData{false, false}553 // first do normal entity escaping554 var escaped bytes.Buffer555 attrEscape(&escaped, text)556 text = escaped.Bytes()557 mark := 0558 for i := 0; i < len(text); i++ {559 if action := options.smartypants[text[i]]; action != nil {560 if i > mark {561 out.Write(text[mark:i])562 }563 previousChar := byte(0)564 if i > 0 {565 previousChar = text[i-1]566 }567 i += action(out, &smrt, previousChar, text[i:])568 mark = i + 1569 }570 }571 if mark < len(text) {572 out.Write(text[mark:])573 }574}575func (options *Html) DocumentHeader(out *bytes.Buffer) {576 if options.flags&HTML_COMPLETE_PAGE == 0 {577 return578 }579 ending := ""580 if options.flags&HTML_USE_XHTML != 0 {581 out.WriteString("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" ")582 out.WriteString("\"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n")583 out.WriteString("<html xmlns=\"http://www.w3.org/1999/xhtml\">\n")584 ending = " /"585 } else {586 out.WriteString("<!DOCTYPE html>\n")587 out.WriteString("<html>\n")588 }589 out.WriteString("<head>\n")590 out.WriteString(" <title>")591 options.NormalText(out, []byte(options.title))592 out.WriteString("</title>\n")593 out.WriteString(" <meta name=\"GENERATOR\" content=\"Blackfriday Markdown Processor v")594 out.WriteString(VERSION)595 out.WriteString("\"")596 out.WriteString(ending)597 out.WriteString(">\n")598 out.WriteString(" <meta charset=\"utf-8\"")599 out.WriteString(ending)600 out.WriteString(">\n")601 if options.css != "" {602 out.WriteString(" <link rel=\"stylesheet\" type=\"text/css\" href=\"")603 attrEscape(out, []byte(options.css))604 out.WriteString("\"")605 out.WriteString(ending)606 out.WriteString(">\n")607 }608 out.WriteString("</head>\n")609 out.WriteString("<body>\n")610 options.tocMarker = out.Len()611}612func (options *Html) DocumentFooter(out *bytes.Buffer) {613 // finalize and insert the table of contents614 if options.flags&HTML_TOC != 0 {615 options.TocFinalize()616 // now we have to insert the table of contents into the document617 var temp bytes.Buffer618 // start by making a copy of everything after the document header619 temp.Write(out.Bytes()[options.tocMarker:])620 // now clear the copied material from the main output buffer621 out.Truncate(options.tocMarker)622 // corner case spacing issue623 if options.flags&HTML_COMPLETE_PAGE != 0 {624 out.WriteByte('\n')625 }626 // insert the table of contents627 out.WriteString("<nav>\n")628 out.Write(options.toc.Bytes())629 out.WriteString("</nav>\n")630 // corner case spacing issue631 if options.flags&HTML_COMPLETE_PAGE == 0 && options.flags&HTML_OMIT_CONTENTS == 0 {632 out.WriteByte('\n')633 }634 // write out everything that came after it635 if options.flags&HTML_OMIT_CONTENTS == 0 {636 out.Write(temp.Bytes())637 }638 }639 if options.flags&HTML_COMPLETE_PAGE != 0 {640 out.WriteString("\n</body>\n")641 out.WriteString("</html>\n")642 }643}644func (options *Html) TocHeaderWithAnchor(text []byte, level int, anchor string) {645 for level > options.currentLevel {646 switch {647 case bytes.HasSuffix(options.toc.Bytes(), []byte("</li>\n")):648 // this sublist can nest underneath a header649 size := options.toc.Len()650 options.toc.Truncate(size - len("</li>\n"))651 case options.currentLevel > 0:652 options.toc.WriteString("<li>")653 }654 if options.toc.Len() > 0 {655 options.toc.WriteByte('\n')656 }657 options.toc.WriteString("<ul>\n")658 options.currentLevel++659 }660 for level < options.currentLevel {661 options.toc.WriteString("</ul>")662 if options.currentLevel > 1 {663 options.toc.WriteString("</li>\n")664 }665 options.currentLevel--666 }667 options.toc.WriteString("<li><a href=\"#")668 if anchor != "" {669 options.toc.WriteString(anchor)670 } else {671 options.toc.WriteString("toc_")672 options.toc.WriteString(strconv.Itoa(options.headerCount))673 }674 options.toc.WriteString("\">")675 options.headerCount++676 options.toc.Write(text)677 options.toc.WriteString("</a></li>\n")678}679func (options *Html) TocHeader(text []byte, level int) {680 options.TocHeaderWithAnchor(text, level, "")681}682func (options *Html) TocFinalize() {683 for options.currentLevel > 1 {684 options.toc.WriteString("</ul></li>\n")685 options.currentLevel--686 }687 if options.currentLevel > 0 {688 options.toc.WriteString("</ul>\n")689 }690}691func isHtmlTag(tag []byte, tagname string) bool {692 found, _ := findHtmlTagPos(tag, tagname)693 return found694}695// Look for a character, but ignore it when it's in any kind of quotes, it696// might be JavaScript697func skipUntilCharIgnoreQuotes(html []byte, start int, char byte) int {698 inSingleQuote := false699 inDoubleQuote := false700 inGraveQuote := false701 i := start702 for i < len(html) {703 switch {704 case html[i] == char && !inSingleQuote && !inDoubleQuote && !inGraveQuote:705 return i706 case html[i] == '\'':707 inSingleQuote = !inSingleQuote708 case html[i] == '"':709 inDoubleQuote = !inDoubleQuote710 case html[i] == '`':711 inGraveQuote = !inGraveQuote712 }713 i++714 }715 return start716}717func findHtmlTagPos(tag []byte, tagname string) (bool, int) {718 i := 0719 if i < len(tag) && tag[0] != '<' {720 return false, -1721 }722 i++723 i = skipSpace(tag, i)724 if i < len(tag) && tag[i] == '/' {725 i++726 }727 i = skipSpace(tag, i)728 j := 0729 for ; i < len(tag); i, j = i+1, j+1 {730 if j >= len(tagname) {731 break732 }733 if strings.ToLower(string(tag[i]))[0] != tagname[j] {734 return false, -1735 }736 }737 if i == len(tag) {738 return false, -1739 }740 rightAngle := skipUntilCharIgnoreQuotes(tag, i, '>')741 if rightAngle > i {742 return true, rightAngle743 }744 return false, -1745}746func skipUntilChar(text []byte, start int, char byte) int {747 i := start748 for i < len(text) && text[i] != char {749 i++750 }751 return i752}753func skipSpace(tag []byte, i int) int {754 for i < len(tag) && isspace(tag[i]) {755 i++756 }757 return i758}759func skipChar(data []byte, start int, char byte) int {760 i := start761 for i < len(data) && data[i] == char {762 i++763 }764 return i765}766func doubleSpace(out *bytes.Buffer) {767 if out.Len() > 0 {768 out.WriteByte('\n')769 }770}771func isRelativeLink(link []byte) (yes bool) {772 // a tag begin with '#'773 if link[0] == '#' {774 return true775 }776 // link begin with '/' but not '//', the second maybe a protocol relative link777 if len(link) >= 2 && link[0] == '/' && link[1] != '/' {778 return true779 }780 // only the root '/'781 if len(link) == 1 && link[0] == '/' {782 return true783 }784 // current directory : begin with "./"785 if bytes.HasPrefix(link, []byte("./")) {786 return true787 }788 // parent directory : begin with "../"789 if bytes.HasPrefix(link, []byte("../")) {790 return true791 }792 return false793}794func (options *Html) ensureUniqueHeaderID(id string) string {795 for count, found := options.headerIDs[id]; found; count, found = options.headerIDs[id] {796 tmp := fmt.Sprintf("%s-%d", id, count+1)797 if _, tmpFound := options.headerIDs[tmp]; !tmpFound {798 options.headerIDs[id] = count + 1799 id = tmp800 } else {801 id = id + "-1"802 }803 }804 if _, found := options.headerIDs[id]; !found {805 options.headerIDs[id] = 0806 }807 return id808}...

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1import (2func main() {3 c := colly.NewCollector()4 c.OnHTML("a[href]", func(e *colly.HTMLElement) {5 link := e.Attr("href")6 fmt.Printf("Link found: %q -> %s\n", e.Text, link)7 })8 c.OnRequest(func(r *colly.Request) {9 fmt.Println("Visiting", r.URL)10 })11 c.OnError(func(_ *colly.Response, err error) {12 fmt.Println("Something went wrong:", err)13 })

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1import (2func main() {3 if err != nil {4 fmt.Println(err)5 }6 defer resp.Body.Close()7 doc, err := html.Parse(resp.Body)8 if err != nil {9 fmt.Println(err)10 }11 options := html.NewTokenizerOptions(doc)12 token := options.Token()13 fmt.Println(token.Data)14 fmt.Println(token.Text())15 fmt.Println(token.String())16 fmt.Println(token.Type)17 fmt.Println(token.DataAtom)18 fmt.Println(token.Attr)19 fmt.Println(token.HasAttr)20 fmt.Println(token.AttrVal)21 fmt.Println(token.Line)22 fmt.Println(token.Column)23 fmt.Println(token.IsEmptyElement)24 fmt.Println(token.HasChildNodes)25 fmt.Println(token.FirstChild)26 fmt.Println(token.LastChild)27 fmt.Println(token.NextSibling)28 fmt.Println(token.PrevSibling)29 fmt.Println(token.Parent)30 fmt.Println(token.AppendChild)31 fmt.Println(token.InsertBefore)32 fmt.Println(token.RemoveChild)33 fmt.Println(token.ReplaceChild)34 fmt.Println(token.CloneNode)35 fmt.Println(token.SetUserData)36 fmt.Println(token.UserData)37 fmt.Println(token.GetAttribute

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1import (2func main() {3 f, err := os.Open("1.html")4 if err != nil {5 fmt.Println(err)6 }7 defer f.Close()8 doc, err := html.Parse(f)9 if err != nil {10 fmt.Println(err)11 }12 fmt.Println("title:", html.Title(doc))13 fmt.Println("body:", html.Body(doc))14 fmt.Println("head:", html.Head(doc))15 fmt.Println("doctype:", html.Doctype(doc))16 fmt.Println("first child:", html.FirstChild(doc))17 fmt.Println("last child:", html.LastChild(doc))18 fmt.Println("next sibling:", html.NextSibling(doc))19 fmt.Println("prev sibling:", html.PrevSibling(doc))20 fmt.Println("parent:", html.Parent(doc))21 fmt.Println("root node:", html.RootNode(doc))22 fmt.Println("text:", html.Text(doc))23 fmt.Println("type:", html.Type(doc))24 fmt.Println("has child:", html.HasChildNodes(doc))25 fmt.Println("has attr:", html.HasAttributes(doc))26 fmt.Println("attr:", html.Attribute([]html.Attribute{}, "attr"))27 fmt.Println("attr value:", html.AttributeValue([]html.Attribute{}, "attr"))28 fmt.Println("attr key:", html.AttributeKey([]html.Attribute{}, "attr"))29 fmt.Println("attr namespace:", html.AttributeNamespace([]html.Attribute{}, "attr"))30 fmt.Println("node name:", html.NodeName(doc))31 fmt.Println("node data:", html.NodeData(doc))32 fmt.Println("node type:", html.NodeType(doc))33 fmt.Println("node namespace:", html.NodeNamespace(doc))34 fmt.Println("node attr:", html.NodeAttr(doc))35 fmt.Println("node first child:", html.NodeFirstChild(doc))36 fmt.Println("node last child:", html.NodeLastChild(doc))37 fmt.Println("node next sibling:", html.NodeNextSibling(doc))38 fmt.Println("node prev sibling:", html.NodePrevSibling(doc))39 fmt.Println("node parent:", html.NodeParent(doc))40 fmt.Println("node root node:", html.NodeRootNode(doc))41 fmt.Println("node text:", html.NodeText(doc))42 fmt.Println("node has child:", html.NodeHasChildNodes(doc))43 fmt.Println("node has attr:", html.NodeHasAttributes(doc))44 fmt.Println("node attr:", html.NodeAttribute(doc, "attr"))45 fmt.Println("node attr value:", html.NodeAttributeValue(doc, "attr"))46 fmt.Println("node attr key:", html.NodeAttributeKey(doc, "attr"))

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1import (2func main() {3 if err != nil {4 panic(err)5 }6 defer resp.Body.Close()7 node, err := htmlquery.Parse(resp.Body)8 if err != nil {9 panic(err)10 }11 fmt.Println("No. of options are", len(options))12}

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1import (2func main() {3 if err != nil {4 log.Fatal(err)5 }6 req.Header.Add("Accept", "text/html")7 client := new(http.Client)8 resp, err := client.Do(req)9 if err != nil {10 log.Fatal(err)11 }12 defer resp.Body.Close()13 doc, err := html.Parse(resp.Body)14 if err != nil {15 log.Fatal(err)16 }17 options, err := html.Options(doc)18 if err != nil {19 log.Fatal(err)20 }21 for k, v := range options {22 fmt.Println(k, v)23 }24}

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1import (2func main() {3 driver := agouti.ChromeDriver()4 err := driver.Start()5 if err != nil {6 fmt.Println(err)7 }8 page, err := driver.NewPage()9 if err != nil {10 fmt.Println(err)11 }12 if err != nil {13 fmt.Println(err)14 }15 err = page.FindByID("dropdown").Select("option2")16 if err != nil {17 fmt.Println(err)18 }19 err = driver.Stop()20 if err != nil {21 fmt.Println(err)22 }23}

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