rss-tools/vendor/golang.org/x/net/html/parse.go (view raw)
| 1 | // Copyright 2010 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package html |
| 6 | |
| 7 | import ( |
| 8 | "errors" |
| 9 | "fmt" |
| 10 | "io" |
| 11 | "strings" |
| 12 | |
| 13 | a "golang.org/x/net/html/atom" |
| 14 | ) |
| 15 | |
| 16 | // A parser implements the HTML5 parsing algorithm: |
| 17 | // https://html.spec.whatwg.org/multipage/syntax.html#tree-construction |
| 18 | type parser struct { |
| 19 | // tokenizer provides the tokens for the parser. |
| 20 | tokenizer *Tokenizer |
| 21 | // tok is the most recently read token. |
| 22 | tok Token |
| 23 | // Self-closing tags like <hr/> are treated as start tags, except that |
| 24 | // hasSelfClosingToken is set while they are being processed. |
| 25 | hasSelfClosingToken bool |
| 26 | // doc is the document root element. |
| 27 | doc *Node |
| 28 | // The stack of open elements (section 12.2.4.2) and active formatting |
| 29 | // elements (section 12.2.4.3). |
| 30 | oe, afe nodeStack |
| 31 | // Element pointers (section 12.2.4.4). |
| 32 | head, form *Node |
| 33 | // Other parsing state flags (section 12.2.4.5). |
| 34 | scripting, framesetOK bool |
| 35 | // The stack of template insertion modes |
| 36 | templateStack insertionModeStack |
| 37 | // im is the current insertion mode. |
| 38 | im insertionMode |
| 39 | // originalIM is the insertion mode to go back to after completing a text |
| 40 | // or inTableText insertion mode. |
| 41 | originalIM insertionMode |
| 42 | // fosterParenting is whether new elements should be inserted according to |
| 43 | // the foster parenting rules (section 12.2.6.1). |
| 44 | fosterParenting bool |
| 45 | // quirks is whether the parser is operating in "quirks mode." |
| 46 | quirks bool |
| 47 | // fragment is whether the parser is parsing an HTML fragment. |
| 48 | fragment bool |
| 49 | // context is the context element when parsing an HTML fragment |
| 50 | // (section 12.4). |
| 51 | context *Node |
| 52 | } |
| 53 | |
| 54 | func (p *parser) top() *Node { |
| 55 | if n := p.oe.top(); n != nil { |
| 56 | return n |
| 57 | } |
| 58 | return p.doc |
| 59 | } |
| 60 | |
| 61 | // Stop tags for use in popUntil. These come from section 12.2.4.2. |
| 62 | var ( |
| 63 | defaultScopeStopTags = map[string][]a.Atom{ |
| 64 | "": {a.Applet, a.Caption, a.Html, a.Table, a.Td, a.Th, a.Marquee, a.Object, a.Template}, |
| 65 | "math": {a.AnnotationXml, a.Mi, a.Mn, a.Mo, a.Ms, a.Mtext}, |
| 66 | "svg": {a.Desc, a.ForeignObject, a.Title}, |
| 67 | } |
| 68 | ) |
| 69 | |
| 70 | type scope int |
| 71 | |
| 72 | const ( |
| 73 | defaultScope scope = iota |
| 74 | listItemScope |
| 75 | buttonScope |
| 76 | tableScope |
| 77 | tableRowScope |
| 78 | tableBodyScope |
| 79 | selectScope |
| 80 | ) |
| 81 | |
| 82 | // popUntil pops the stack of open elements at the highest element whose tag |
| 83 | // is in matchTags, provided there is no higher element in the scope's stop |
| 84 | // tags (as defined in section 12.2.4.2). It returns whether or not there was |
| 85 | // such an element. If there was not, popUntil leaves the stack unchanged. |
| 86 | // |
| 87 | // For example, the set of stop tags for table scope is: "html", "table". If |
| 88 | // the stack was: |
| 89 | // ["html", "body", "font", "table", "b", "i", "u"] |
| 90 | // then popUntil(tableScope, "font") would return false, but |
| 91 | // popUntil(tableScope, "i") would return true and the stack would become: |
| 92 | // ["html", "body", "font", "table", "b"] |
| 93 | // |
| 94 | // If an element's tag is in both the stop tags and matchTags, then the stack |
| 95 | // will be popped and the function returns true (provided, of course, there was |
| 96 | // no higher element in the stack that was also in the stop tags). For example, |
| 97 | // popUntil(tableScope, "table") returns true and leaves: |
| 98 | // ["html", "body", "font"] |
| 99 | func (p *parser) popUntil(s scope, matchTags ...a.Atom) bool { |
| 100 | if i := p.indexOfElementInScope(s, matchTags...); i != -1 { |
| 101 | p.oe = p.oe[:i] |
| 102 | return true |
| 103 | } |
| 104 | return false |
| 105 | } |
| 106 | |
| 107 | // indexOfElementInScope returns the index in p.oe of the highest element whose |
| 108 | // tag is in matchTags that is in scope. If no matching element is in scope, it |
| 109 | // returns -1. |
| 110 | func (p *parser) indexOfElementInScope(s scope, matchTags ...a.Atom) int { |
| 111 | for i := len(p.oe) - 1; i >= 0; i-- { |
| 112 | tagAtom := p.oe[i].DataAtom |
| 113 | if p.oe[i].Namespace == "" { |
| 114 | for _, t := range matchTags { |
| 115 | if t == tagAtom { |
| 116 | return i |
| 117 | } |
| 118 | } |
| 119 | switch s { |
| 120 | case defaultScope: |
| 121 | // No-op. |
| 122 | case listItemScope: |
| 123 | if tagAtom == a.Ol || tagAtom == a.Ul { |
| 124 | return -1 |
| 125 | } |
| 126 | case buttonScope: |
| 127 | if tagAtom == a.Button { |
| 128 | return -1 |
| 129 | } |
| 130 | case tableScope: |
| 131 | if tagAtom == a.Html || tagAtom == a.Table || tagAtom == a.Template { |
| 132 | return -1 |
| 133 | } |
| 134 | case selectScope: |
| 135 | if tagAtom != a.Optgroup && tagAtom != a.Option { |
| 136 | return -1 |
| 137 | } |
| 138 | default: |
| 139 | panic(fmt.Sprintf("html: internal error: indexOfElementInScope unknown scope: %d", s)) |
| 140 | } |
| 141 | } |
| 142 | switch s { |
| 143 | case defaultScope, listItemScope, buttonScope: |
| 144 | for _, t := range defaultScopeStopTags[p.oe[i].Namespace] { |
| 145 | if t == tagAtom { |
| 146 | return -1 |
| 147 | } |
| 148 | } |
| 149 | } |
| 150 | } |
| 151 | return -1 |
| 152 | } |
| 153 | |
| 154 | // elementInScope is like popUntil, except that it doesn't modify the stack of |
| 155 | // open elements. |
| 156 | func (p *parser) elementInScope(s scope, matchTags ...a.Atom) bool { |
| 157 | return p.indexOfElementInScope(s, matchTags...) != -1 |
| 158 | } |
| 159 | |
| 160 | // clearStackToContext pops elements off the stack of open elements until a |
| 161 | // scope-defined element is found. |
| 162 | func (p *parser) clearStackToContext(s scope) { |
| 163 | for i := len(p.oe) - 1; i >= 0; i-- { |
| 164 | tagAtom := p.oe[i].DataAtom |
| 165 | switch s { |
| 166 | case tableScope: |
| 167 | if tagAtom == a.Html || tagAtom == a.Table || tagAtom == a.Template { |
| 168 | p.oe = p.oe[:i+1] |
| 169 | return |
| 170 | } |
| 171 | case tableRowScope: |
| 172 | if tagAtom == a.Html || tagAtom == a.Tr || tagAtom == a.Template { |
| 173 | p.oe = p.oe[:i+1] |
| 174 | return |
| 175 | } |
| 176 | case tableBodyScope: |
| 177 | if tagAtom == a.Html || tagAtom == a.Tbody || tagAtom == a.Tfoot || tagAtom == a.Thead || tagAtom == a.Template { |
| 178 | p.oe = p.oe[:i+1] |
| 179 | return |
| 180 | } |
| 181 | default: |
| 182 | panic(fmt.Sprintf("html: internal error: clearStackToContext unknown scope: %d", s)) |
| 183 | } |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | // parseGenericRawTextElement implements the generic raw text element parsing |
| 188 | // algorithm defined in 12.2.6.2. |
| 189 | // https://html.spec.whatwg.org/multipage/parsing.html#parsing-elements-that-contain-only-text |
| 190 | // TODO: Since both RAWTEXT and RCDATA states are treated as tokenizer's part |
| 191 | // officially, need to make tokenizer consider both states. |
| 192 | func (p *parser) parseGenericRawTextElement() { |
| 193 | p.addElement() |
| 194 | p.originalIM = p.im |
| 195 | p.im = textIM |
| 196 | } |
| 197 | |
| 198 | // generateImpliedEndTags pops nodes off the stack of open elements as long as |
| 199 | // the top node has a tag name of dd, dt, li, optgroup, option, p, rb, rp, rt or rtc. |
| 200 | // If exceptions are specified, nodes with that name will not be popped off. |
| 201 | func (p *parser) generateImpliedEndTags(exceptions ...string) { |
| 202 | var i int |
| 203 | loop: |
| 204 | for i = len(p.oe) - 1; i >= 0; i-- { |
| 205 | n := p.oe[i] |
| 206 | if n.Type != ElementNode { |
| 207 | break |
| 208 | } |
| 209 | switch n.DataAtom { |
| 210 | case a.Dd, a.Dt, a.Li, a.Optgroup, a.Option, a.P, a.Rb, a.Rp, a.Rt, a.Rtc: |
| 211 | for _, except := range exceptions { |
| 212 | if n.Data == except { |
| 213 | break loop |
| 214 | } |
| 215 | } |
| 216 | continue |
| 217 | } |
| 218 | break |
| 219 | } |
| 220 | |
| 221 | p.oe = p.oe[:i+1] |
| 222 | } |
| 223 | |
| 224 | // addChild adds a child node n to the top element, and pushes n onto the stack |
| 225 | // of open elements if it is an element node. |
| 226 | func (p *parser) addChild(n *Node) { |
| 227 | if p.shouldFosterParent() { |
| 228 | p.fosterParent(n) |
| 229 | } else { |
| 230 | p.top().AppendChild(n) |
| 231 | } |
| 232 | |
| 233 | if n.Type == ElementNode { |
| 234 | p.insertOpenElement(n) |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | func (p *parser) insertOpenElement(n *Node) { |
| 239 | p.oe = append(p.oe, n) |
| 240 | if len(p.oe) > 512 { |
| 241 | panic("html: open stack of elements exceeds 512 nodes") |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | // shouldFosterParent returns whether the next node to be added should be |
| 246 | // foster parented. |
| 247 | func (p *parser) shouldFosterParent() bool { |
| 248 | if p.fosterParenting { |
| 249 | switch p.top().DataAtom { |
| 250 | case a.Table, a.Tbody, a.Tfoot, a.Thead, a.Tr: |
| 251 | return true |
| 252 | } |
| 253 | } |
| 254 | return false |
| 255 | } |
| 256 | |
| 257 | // fosterParent adds a child node according to the foster parenting rules. |
| 258 | // Section 12.2.6.1, "foster parenting". |
| 259 | func (p *parser) fosterParent(n *Node) { |
| 260 | var table, parent, prev, template *Node |
| 261 | var i int |
| 262 | for i = len(p.oe) - 1; i >= 0; i-- { |
| 263 | if p.oe[i].DataAtom == a.Table { |
| 264 | table = p.oe[i] |
| 265 | break |
| 266 | } |
| 267 | } |
| 268 | |
| 269 | var j int |
| 270 | for j = len(p.oe) - 1; j >= 0; j-- { |
| 271 | if p.oe[j].DataAtom == a.Template { |
| 272 | template = p.oe[j] |
| 273 | break |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | if template != nil && (table == nil || j > i) { |
| 278 | template.AppendChild(n) |
| 279 | return |
| 280 | } |
| 281 | |
| 282 | if table == nil { |
| 283 | // The foster parent is the html element. |
| 284 | parent = p.oe[0] |
| 285 | } else { |
| 286 | parent = table.Parent |
| 287 | } |
| 288 | if parent == nil { |
| 289 | parent = p.oe[i-1] |
| 290 | } |
| 291 | |
| 292 | if table != nil { |
| 293 | prev = table.PrevSibling |
| 294 | } else { |
| 295 | prev = parent.LastChild |
| 296 | } |
| 297 | if prev != nil && prev.Type == TextNode && n.Type == TextNode { |
| 298 | prev.Data += n.Data |
| 299 | return |
| 300 | } |
| 301 | |
| 302 | parent.InsertBefore(n, table) |
| 303 | } |
| 304 | |
| 305 | // addText adds text to the preceding node if it is a text node, or else it |
| 306 | // calls addChild with a new text node. |
| 307 | func (p *parser) addText(text string) { |
| 308 | if text == "" { |
| 309 | return |
| 310 | } |
| 311 | |
| 312 | if p.shouldFosterParent() { |
| 313 | p.fosterParent(&Node{ |
| 314 | Type: TextNode, |
| 315 | Data: text, |
| 316 | }) |
| 317 | return |
| 318 | } |
| 319 | |
| 320 | t := p.top() |
| 321 | if n := t.LastChild; n != nil && n.Type == TextNode { |
| 322 | n.Data += text |
| 323 | return |
| 324 | } |
| 325 | p.addChild(&Node{ |
| 326 | Type: TextNode, |
| 327 | Data: text, |
| 328 | }) |
| 329 | } |
| 330 | |
| 331 | // addElement adds a child element based on the current token. |
| 332 | func (p *parser) addElement() { |
| 333 | p.addChild(&Node{ |
| 334 | Type: ElementNode, |
| 335 | DataAtom: p.tok.DataAtom, |
| 336 | Data: p.tok.Data, |
| 337 | Attr: p.tok.Attr, |
| 338 | }) |
| 339 | } |
| 340 | |
| 341 | // Section 12.2.4.3. |
| 342 | func (p *parser) addFormattingElement() { |
| 343 | tagAtom, attr := p.tok.DataAtom, p.tok.Attr |
| 344 | p.addElement() |
| 345 | |
| 346 | // Implement the Noah's Ark clause, but with three per family instead of two. |
| 347 | identicalElements := 0 |
| 348 | findIdenticalElements: |
| 349 | for i := len(p.afe) - 1; i >= 0; i-- { |
| 350 | n := p.afe[i] |
| 351 | if n.Type == scopeMarkerNode { |
| 352 | break |
| 353 | } |
| 354 | if n.Type != ElementNode { |
| 355 | continue |
| 356 | } |
| 357 | if n.Namespace != "" { |
| 358 | continue |
| 359 | } |
| 360 | if n.DataAtom != tagAtom { |
| 361 | continue |
| 362 | } |
| 363 | if len(n.Attr) != len(attr) { |
| 364 | continue |
| 365 | } |
| 366 | compareAttributes: |
| 367 | for _, t0 := range n.Attr { |
| 368 | for _, t1 := range attr { |
| 369 | if t0.Key == t1.Key && t0.Namespace == t1.Namespace && t0.Val == t1.Val { |
| 370 | // Found a match for this attribute, continue with the next attribute. |
| 371 | continue compareAttributes |
| 372 | } |
| 373 | } |
| 374 | // If we get here, there is no attribute that matches a. |
| 375 | // Therefore the element is not identical to the new one. |
| 376 | continue findIdenticalElements |
| 377 | } |
| 378 | |
| 379 | identicalElements++ |
| 380 | if identicalElements >= 3 { |
| 381 | p.afe.remove(n) |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | p.afe = append(p.afe, p.top()) |
| 386 | } |
| 387 | |
| 388 | // Section 12.2.4.3. |
| 389 | func (p *parser) clearActiveFormattingElements() { |
| 390 | for { |
| 391 | if n := p.afe.pop(); len(p.afe) == 0 || n.Type == scopeMarkerNode { |
| 392 | return |
| 393 | } |
| 394 | } |
| 395 | } |
| 396 | |
| 397 | // Section 12.2.4.3. |
| 398 | func (p *parser) reconstructActiveFormattingElements() { |
| 399 | n := p.afe.top() |
| 400 | if n == nil { |
| 401 | return |
| 402 | } |
| 403 | if n.Type == scopeMarkerNode || p.oe.index(n) != -1 { |
| 404 | return |
| 405 | } |
| 406 | i := len(p.afe) - 1 |
| 407 | for n.Type != scopeMarkerNode && p.oe.index(n) == -1 { |
| 408 | if i == 0 { |
| 409 | i = -1 |
| 410 | break |
| 411 | } |
| 412 | i-- |
| 413 | n = p.afe[i] |
| 414 | } |
| 415 | for { |
| 416 | i++ |
| 417 | clone := p.afe[i].clone() |
| 418 | p.addChild(clone) |
| 419 | p.afe[i] = clone |
| 420 | if i == len(p.afe)-1 { |
| 421 | break |
| 422 | } |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | // Section 12.2.5. |
| 427 | func (p *parser) acknowledgeSelfClosingTag() { |
| 428 | p.hasSelfClosingToken = false |
| 429 | } |
| 430 | |
| 431 | // An insertion mode (section 12.2.4.1) is the state transition function from |
| 432 | // a particular state in the HTML5 parser's state machine. It updates the |
| 433 | // parser's fields depending on parser.tok (where ErrorToken means EOF). |
| 434 | // It returns whether the token was consumed. |
| 435 | type insertionMode func(*parser) bool |
| 436 | |
| 437 | // setOriginalIM sets the insertion mode to return to after completing a text or |
| 438 | // inTableText insertion mode. |
| 439 | // Section 12.2.4.1, "using the rules for". |
| 440 | func (p *parser) setOriginalIM() { |
| 441 | if p.originalIM != nil { |
| 442 | panic("html: bad parser state: originalIM was set twice") |
| 443 | } |
| 444 | p.originalIM = p.im |
| 445 | } |
| 446 | |
| 447 | // Section 12.2.4.1, "reset the insertion mode". |
| 448 | func (p *parser) resetInsertionMode() { |
| 449 | for i := len(p.oe) - 1; i >= 0; i-- { |
| 450 | n := p.oe[i] |
| 451 | last := i == 0 |
| 452 | if last && p.context != nil { |
| 453 | n = p.context |
| 454 | } |
| 455 | |
| 456 | switch n.DataAtom { |
| 457 | case a.Select: |
| 458 | if !last { |
| 459 | for ancestor, first := n, p.oe[0]; ancestor != first; { |
| 460 | ancestor = p.oe[p.oe.index(ancestor)-1] |
| 461 | switch ancestor.DataAtom { |
| 462 | case a.Template: |
| 463 | p.im = inSelectIM |
| 464 | return |
| 465 | case a.Table: |
| 466 | p.im = inSelectInTableIM |
| 467 | return |
| 468 | } |
| 469 | } |
| 470 | } |
| 471 | p.im = inSelectIM |
| 472 | case a.Td, a.Th: |
| 473 | // TODO: remove this divergence from the HTML5 spec. |
| 474 | // |
| 475 | // See https://bugs.chromium.org/p/chromium/issues/detail?id=829668 |
| 476 | p.im = inCellIM |
| 477 | case a.Tr: |
| 478 | p.im = inRowIM |
| 479 | case a.Tbody, a.Thead, a.Tfoot: |
| 480 | p.im = inTableBodyIM |
| 481 | case a.Caption: |
| 482 | p.im = inCaptionIM |
| 483 | case a.Colgroup: |
| 484 | p.im = inColumnGroupIM |
| 485 | case a.Table: |
| 486 | p.im = inTableIM |
| 487 | case a.Template: |
| 488 | // TODO: remove this divergence from the HTML5 spec. |
| 489 | if n.Namespace != "" { |
| 490 | continue |
| 491 | } |
| 492 | p.im = p.templateStack.top() |
| 493 | case a.Head: |
| 494 | // TODO: remove this divergence from the HTML5 spec. |
| 495 | // |
| 496 | // See https://bugs.chromium.org/p/chromium/issues/detail?id=829668 |
| 497 | p.im = inHeadIM |
| 498 | case a.Body: |
| 499 | p.im = inBodyIM |
| 500 | case a.Frameset: |
| 501 | p.im = inFramesetIM |
| 502 | case a.Html: |
| 503 | if p.head == nil { |
| 504 | p.im = beforeHeadIM |
| 505 | } else { |
| 506 | p.im = afterHeadIM |
| 507 | } |
| 508 | default: |
| 509 | if last { |
| 510 | p.im = inBodyIM |
| 511 | return |
| 512 | } |
| 513 | continue |
| 514 | } |
| 515 | return |
| 516 | } |
| 517 | } |
| 518 | |
| 519 | const whitespace = " \t\r\n\f" |
| 520 | |
| 521 | // Section 12.2.6.4.1. |
| 522 | func initialIM(p *parser) bool { |
| 523 | switch p.tok.Type { |
| 524 | case TextToken: |
| 525 | p.tok.Data = strings.TrimLeft(p.tok.Data, whitespace) |
| 526 | if len(p.tok.Data) == 0 { |
| 527 | // It was all whitespace, so ignore it. |
| 528 | return true |
| 529 | } |
| 530 | case CommentToken: |
| 531 | p.doc.AppendChild(&Node{ |
| 532 | Type: CommentNode, |
| 533 | Data: p.tok.Data, |
| 534 | }) |
| 535 | return true |
| 536 | case DoctypeToken: |
| 537 | n, quirks := parseDoctype(p.tok.Data) |
| 538 | p.doc.AppendChild(n) |
| 539 | p.quirks = quirks |
| 540 | p.im = beforeHTMLIM |
| 541 | return true |
| 542 | } |
| 543 | p.quirks = true |
| 544 | p.im = beforeHTMLIM |
| 545 | return false |
| 546 | } |
| 547 | |
| 548 | // Section 12.2.6.4.2. |
| 549 | func beforeHTMLIM(p *parser) bool { |
| 550 | switch p.tok.Type { |
| 551 | case DoctypeToken: |
| 552 | // Ignore the token. |
| 553 | return true |
| 554 | case TextToken: |
| 555 | p.tok.Data = strings.TrimLeft(p.tok.Data, whitespace) |
| 556 | if len(p.tok.Data) == 0 { |
| 557 | // It was all whitespace, so ignore it. |
| 558 | return true |
| 559 | } |
| 560 | case StartTagToken: |
| 561 | if p.tok.DataAtom == a.Html { |
| 562 | p.addElement() |
| 563 | p.im = beforeHeadIM |
| 564 | return true |
| 565 | } |
| 566 | case EndTagToken: |
| 567 | switch p.tok.DataAtom { |
| 568 | case a.Head, a.Body, a.Html, a.Br: |
| 569 | p.parseImpliedToken(StartTagToken, a.Html, a.Html.String()) |
| 570 | return false |
| 571 | default: |
| 572 | // Ignore the token. |
| 573 | return true |
| 574 | } |
| 575 | case CommentToken: |
| 576 | p.doc.AppendChild(&Node{ |
| 577 | Type: CommentNode, |
| 578 | Data: p.tok.Data, |
| 579 | }) |
| 580 | return true |
| 581 | } |
| 582 | p.parseImpliedToken(StartTagToken, a.Html, a.Html.String()) |
| 583 | return false |
| 584 | } |
| 585 | |
| 586 | // Section 12.2.6.4.3. |
| 587 | func beforeHeadIM(p *parser) bool { |
| 588 | switch p.tok.Type { |
| 589 | case TextToken: |
| 590 | p.tok.Data = strings.TrimLeft(p.tok.Data, whitespace) |
| 591 | if len(p.tok.Data) == 0 { |
| 592 | // It was all whitespace, so ignore it. |
| 593 | return true |
| 594 | } |
| 595 | case StartTagToken: |
| 596 | switch p.tok.DataAtom { |
| 597 | case a.Head: |
| 598 | p.addElement() |
| 599 | p.head = p.top() |
| 600 | p.im = inHeadIM |
| 601 | return true |
| 602 | case a.Html: |
| 603 | return inBodyIM(p) |
| 604 | } |
| 605 | case EndTagToken: |
| 606 | switch p.tok.DataAtom { |
| 607 | case a.Head, a.Body, a.Html, a.Br: |
| 608 | p.parseImpliedToken(StartTagToken, a.Head, a.Head.String()) |
| 609 | return false |
| 610 | default: |
| 611 | // Ignore the token. |
| 612 | return true |
| 613 | } |
| 614 | case CommentToken: |
| 615 | p.addChild(&Node{ |
| 616 | Type: CommentNode, |
| 617 | Data: p.tok.Data, |
| 618 | }) |
| 619 | return true |
| 620 | case DoctypeToken: |
| 621 | // Ignore the token. |
| 622 | return true |
| 623 | } |
| 624 | |
| 625 | p.parseImpliedToken(StartTagToken, a.Head, a.Head.String()) |
| 626 | return false |
| 627 | } |
| 628 | |
| 629 | // Section 12.2.6.4.4. |
| 630 | func inHeadIM(p *parser) bool { |
| 631 | switch p.tok.Type { |
| 632 | case TextToken: |
| 633 | s := strings.TrimLeft(p.tok.Data, whitespace) |
| 634 | if len(s) < len(p.tok.Data) { |
| 635 | // Add the initial whitespace to the current node. |
| 636 | p.addText(p.tok.Data[:len(p.tok.Data)-len(s)]) |
| 637 | if s == "" { |
| 638 | return true |
| 639 | } |
| 640 | p.tok.Data = s |
| 641 | } |
| 642 | case StartTagToken: |
| 643 | switch p.tok.DataAtom { |
| 644 | case a.Html: |
| 645 | return inBodyIM(p) |
| 646 | case a.Base, a.Basefont, a.Bgsound, a.Link, a.Meta: |
| 647 | p.addElement() |
| 648 | p.oe.pop() |
| 649 | p.acknowledgeSelfClosingTag() |
| 650 | return true |
| 651 | case a.Noscript: |
| 652 | if p.scripting { |
| 653 | p.parseGenericRawTextElement() |
| 654 | return true |
| 655 | } |
| 656 | p.addElement() |
| 657 | p.im = inHeadNoscriptIM |
| 658 | // Don't let the tokenizer go into raw text mode when scripting is disabled. |
| 659 | p.tokenizer.NextIsNotRawText() |
| 660 | return true |
| 661 | case a.Script, a.Title: |
| 662 | p.addElement() |
| 663 | p.setOriginalIM() |
| 664 | p.im = textIM |
| 665 | return true |
| 666 | case a.Noframes, a.Style: |
| 667 | p.parseGenericRawTextElement() |
| 668 | return true |
| 669 | case a.Head: |
| 670 | // Ignore the token. |
| 671 | return true |
| 672 | case a.Template: |
| 673 | // TODO: remove this divergence from the HTML5 spec. |
| 674 | // |
| 675 | // We don't handle all of the corner cases when mixing foreign |
| 676 | // content (i.e. <math> or <svg>) with <template>. Without this |
| 677 | // early return, we can get into an infinite loop, possibly because |
| 678 | // of the "TODO... further divergence" a little below. |
| 679 | // |
| 680 | // As a workaround, if we are mixing foreign content and templates, |
| 681 | // just ignore the rest of the HTML. Foreign content is rare and a |
| 682 | // relatively old HTML feature. Templates are also rare and a |
| 683 | // relatively new HTML feature. Their combination is very rare. |
| 684 | for _, e := range p.oe { |
| 685 | if e.Namespace != "" { |
| 686 | p.im = ignoreTheRemainingTokens |
| 687 | return true |
| 688 | } |
| 689 | } |
| 690 | |
| 691 | p.addElement() |
| 692 | p.afe = append(p.afe, &scopeMarker) |
| 693 | p.framesetOK = false |
| 694 | p.im = inTemplateIM |
| 695 | p.templateStack = append(p.templateStack, inTemplateIM) |
| 696 | return true |
| 697 | } |
| 698 | case EndTagToken: |
| 699 | switch p.tok.DataAtom { |
| 700 | case a.Head: |
| 701 | p.oe.pop() |
| 702 | p.im = afterHeadIM |
| 703 | return true |
| 704 | case a.Body, a.Html, a.Br: |
| 705 | p.parseImpliedToken(EndTagToken, a.Head, a.Head.String()) |
| 706 | return false |
| 707 | case a.Template: |
| 708 | if !p.oe.contains(a.Template) { |
| 709 | return true |
| 710 | } |
| 711 | // TODO: remove this further divergence from the HTML5 spec. |
| 712 | // |
| 713 | // See https://bugs.chromium.org/p/chromium/issues/detail?id=829668 |
| 714 | p.generateImpliedEndTags() |
| 715 | for i := len(p.oe) - 1; i >= 0; i-- { |
| 716 | if n := p.oe[i]; n.Namespace == "" && n.DataAtom == a.Template { |
| 717 | p.oe = p.oe[:i] |
| 718 | break |
| 719 | } |
| 720 | } |
| 721 | p.clearActiveFormattingElements() |
| 722 | p.templateStack.pop() |
| 723 | p.resetInsertionMode() |
| 724 | return true |
| 725 | default: |
| 726 | // Ignore the token. |
| 727 | return true |
| 728 | } |
| 729 | case CommentToken: |
| 730 | p.addChild(&Node{ |
| 731 | Type: CommentNode, |
| 732 | Data: p.tok.Data, |
| 733 | }) |
| 734 | return true |
| 735 | case DoctypeToken: |
| 736 | // Ignore the token. |
| 737 | return true |
| 738 | } |
| 739 | |
| 740 | p.parseImpliedToken(EndTagToken, a.Head, a.Head.String()) |
| 741 | return false |
| 742 | } |
| 743 | |
| 744 | // Section 12.2.6.4.5. |
| 745 | func inHeadNoscriptIM(p *parser) bool { |
| 746 | switch p.tok.Type { |
| 747 | case DoctypeToken: |
| 748 | // Ignore the token. |
| 749 | return true |
| 750 | case StartTagToken: |
| 751 | switch p.tok.DataAtom { |
| 752 | case a.Html: |
| 753 | return inBodyIM(p) |
| 754 | case a.Basefont, a.Bgsound, a.Link, a.Meta, a.Noframes, a.Style: |
| 755 | return inHeadIM(p) |
| 756 | case a.Head: |
| 757 | // Ignore the token. |
| 758 | return true |
| 759 | case a.Noscript: |
| 760 | // Don't let the tokenizer go into raw text mode even when a <noscript> |
| 761 | // tag is in "in head noscript" insertion mode. |
| 762 | p.tokenizer.NextIsNotRawText() |
| 763 | // Ignore the token. |
| 764 | return true |
| 765 | } |
| 766 | case EndTagToken: |
| 767 | switch p.tok.DataAtom { |
| 768 | case a.Noscript, a.Br: |
| 769 | default: |
| 770 | // Ignore the token. |
| 771 | return true |
| 772 | } |
| 773 | case TextToken: |
| 774 | s := strings.TrimLeft(p.tok.Data, whitespace) |
| 775 | if len(s) == 0 { |
| 776 | // It was all whitespace. |
| 777 | return inHeadIM(p) |
| 778 | } |
| 779 | case CommentToken: |
| 780 | return inHeadIM(p) |
| 781 | } |
| 782 | p.oe.pop() |
| 783 | if p.top().DataAtom != a.Head { |
| 784 | panic("html: the new current node will be a head element.") |
| 785 | } |
| 786 | p.im = inHeadIM |
| 787 | if p.tok.DataAtom == a.Noscript { |
| 788 | return true |
| 789 | } |
| 790 | return false |
| 791 | } |
| 792 | |
| 793 | // Section 12.2.6.4.6. |
| 794 | func afterHeadIM(p *parser) bool { |
| 795 | switch p.tok.Type { |
| 796 | case TextToken: |
| 797 | s := strings.TrimLeft(p.tok.Data, whitespace) |
| 798 | if len(s) < len(p.tok.Data) { |
| 799 | // Add the initial whitespace to the current node. |
| 800 | p.addText(p.tok.Data[:len(p.tok.Data)-len(s)]) |
| 801 | if s == "" { |
| 802 | return true |
| 803 | } |
| 804 | p.tok.Data = s |
| 805 | } |
| 806 | case StartTagToken: |
| 807 | switch p.tok.DataAtom { |
| 808 | case a.Html: |
| 809 | return inBodyIM(p) |
| 810 | case a.Body: |
| 811 | p.addElement() |
| 812 | p.framesetOK = false |
| 813 | p.im = inBodyIM |
| 814 | return true |
| 815 | case a.Frameset: |
| 816 | p.addElement() |
| 817 | p.im = inFramesetIM |
| 818 | return true |
| 819 | case a.Base, a.Basefont, a.Bgsound, a.Link, a.Meta, a.Noframes, a.Script, a.Style, a.Template, a.Title: |
| 820 | p.insertOpenElement(p.head) |
| 821 | defer p.oe.remove(p.head) |
| 822 | return inHeadIM(p) |
| 823 | case a.Head: |
| 824 | // Ignore the token. |
| 825 | return true |
| 826 | } |
| 827 | case EndTagToken: |
| 828 | switch p.tok.DataAtom { |
| 829 | case a.Body, a.Html, a.Br: |
| 830 | // Drop down to creating an implied <body> tag. |
| 831 | case a.Template: |
| 832 | return inHeadIM(p) |
| 833 | default: |
| 834 | // Ignore the token. |
| 835 | return true |
| 836 | } |
| 837 | case CommentToken: |
| 838 | p.addChild(&Node{ |
| 839 | Type: CommentNode, |
| 840 | Data: p.tok.Data, |
| 841 | }) |
| 842 | return true |
| 843 | case DoctypeToken: |
| 844 | // Ignore the token. |
| 845 | return true |
| 846 | } |
| 847 | |
| 848 | p.parseImpliedToken(StartTagToken, a.Body, a.Body.String()) |
| 849 | p.framesetOK = true |
| 850 | if p.tok.Type == ErrorToken { |
| 851 | // Stop parsing. |
| 852 | return true |
| 853 | } |
| 854 | return false |
| 855 | } |
| 856 | |
| 857 | // copyAttributes copies attributes of src not found on dst to dst. |
| 858 | func copyAttributes(dst *Node, src Token) { |
| 859 | if len(src.Attr) == 0 { |
| 860 | return |
| 861 | } |
| 862 | attr := map[string]string{} |
| 863 | for _, t := range dst.Attr { |
| 864 | attr[t.Key] = t.Val |
| 865 | } |
| 866 | for _, t := range src.Attr { |
| 867 | if _, ok := attr[t.Key]; !ok { |
| 868 | dst.Attr = append(dst.Attr, t) |
| 869 | attr[t.Key] = t.Val |
| 870 | } |
| 871 | } |
| 872 | } |
| 873 | |
| 874 | // Section 12.2.6.4.7. |
| 875 | func inBodyIM(p *parser) bool { |
| 876 | switch p.tok.Type { |
| 877 | case TextToken: |
| 878 | d := p.tok.Data |
| 879 | switch n := p.oe.top(); n.DataAtom { |
| 880 | case a.Pre, a.Listing: |
| 881 | if n.FirstChild == nil { |
| 882 | // Ignore a newline at the start of a <pre> block. |
| 883 | if d != "" && d[0] == '\r' { |
| 884 | d = d[1:] |
| 885 | } |
| 886 | if d != "" && d[0] == '\n' { |
| 887 | d = d[1:] |
| 888 | } |
| 889 | } |
| 890 | } |
| 891 | d = strings.Replace(d, "\x00", "", -1) |
| 892 | if d == "" { |
| 893 | return true |
| 894 | } |
| 895 | p.reconstructActiveFormattingElements() |
| 896 | p.addText(d) |
| 897 | if p.framesetOK && strings.TrimLeft(d, whitespace) != "" { |
| 898 | // There were non-whitespace characters inserted. |
| 899 | p.framesetOK = false |
| 900 | } |
| 901 | case StartTagToken: |
| 902 | switch p.tok.DataAtom { |
| 903 | case a.Html: |
| 904 | if p.oe.contains(a.Template) { |
| 905 | return true |
| 906 | } |
| 907 | copyAttributes(p.oe[0], p.tok) |
| 908 | case a.Base, a.Basefont, a.Bgsound, a.Link, a.Meta, a.Noframes, a.Script, a.Style, a.Template, a.Title: |
| 909 | return inHeadIM(p) |
| 910 | case a.Body: |
| 911 | if p.oe.contains(a.Template) { |
| 912 | return true |
| 913 | } |
| 914 | if len(p.oe) >= 2 { |
| 915 | body := p.oe[1] |
| 916 | if body.Type == ElementNode && body.DataAtom == a.Body { |
| 917 | p.framesetOK = false |
| 918 | copyAttributes(body, p.tok) |
| 919 | } |
| 920 | } |
| 921 | case a.Frameset: |
| 922 | if !p.framesetOK || len(p.oe) < 2 || p.oe[1].DataAtom != a.Body { |
| 923 | // Ignore the token. |
| 924 | return true |
| 925 | } |
| 926 | body := p.oe[1] |
| 927 | if body.Parent != nil { |
| 928 | body.Parent.RemoveChild(body) |
| 929 | } |
| 930 | p.oe = p.oe[:1] |
| 931 | p.addElement() |
| 932 | p.im = inFramesetIM |
| 933 | return true |
| 934 | case a.Address, a.Article, a.Aside, a.Blockquote, a.Center, a.Details, a.Dialog, a.Dir, a.Div, a.Dl, a.Fieldset, a.Figcaption, a.Figure, a.Footer, a.Header, a.Hgroup, a.Main, a.Menu, a.Nav, a.Ol, a.P, a.Search, a.Section, a.Summary, a.Ul: |
| 935 | p.popUntil(buttonScope, a.P) |
| 936 | p.addElement() |
| 937 | case a.H1, a.H2, a.H3, a.H4, a.H5, a.H6: |
| 938 | p.popUntil(buttonScope, a.P) |
| 939 | switch n := p.top(); n.DataAtom { |
| 940 | case a.H1, a.H2, a.H3, a.H4, a.H5, a.H6: |
| 941 | p.oe.pop() |
| 942 | } |
| 943 | p.addElement() |
| 944 | case a.Pre, a.Listing: |
| 945 | p.popUntil(buttonScope, a.P) |
| 946 | p.addElement() |
| 947 | // The newline, if any, will be dealt with by the TextToken case. |
| 948 | p.framesetOK = false |
| 949 | case a.Form: |
| 950 | if p.form != nil && !p.oe.contains(a.Template) { |
| 951 | // Ignore the token |
| 952 | return true |
| 953 | } |
| 954 | p.popUntil(buttonScope, a.P) |
| 955 | p.addElement() |
| 956 | if !p.oe.contains(a.Template) { |
| 957 | p.form = p.top() |
| 958 | } |
| 959 | case a.Li: |
| 960 | p.framesetOK = false |
| 961 | for i := len(p.oe) - 1; i >= 0; i-- { |
| 962 | node := p.oe[i] |
| 963 | switch node.DataAtom { |
| 964 | case a.Li: |
| 965 | p.oe = p.oe[:i] |
| 966 | case a.Address, a.Div, a.P: |
| 967 | continue |
| 968 | default: |
| 969 | if !isSpecialElement(node) { |
| 970 | continue |
| 971 | } |
| 972 | } |
| 973 | break |
| 974 | } |
| 975 | p.popUntil(buttonScope, a.P) |
| 976 | p.addElement() |
| 977 | case a.Dd, a.Dt: |
| 978 | p.framesetOK = false |
| 979 | for i := len(p.oe) - 1; i >= 0; i-- { |
| 980 | node := p.oe[i] |
| 981 | switch node.DataAtom { |
| 982 | case a.Dd, a.Dt: |
| 983 | p.oe = p.oe[:i] |
| 984 | case a.Address, a.Div, a.P: |
| 985 | continue |
| 986 | default: |
| 987 | if !isSpecialElement(node) { |
| 988 | continue |
| 989 | } |
| 990 | } |
| 991 | break |
| 992 | } |
| 993 | p.popUntil(buttonScope, a.P) |
| 994 | p.addElement() |
| 995 | case a.Plaintext: |
| 996 | p.popUntil(buttonScope, a.P) |
| 997 | p.addElement() |
| 998 | case a.Button: |
| 999 | p.popUntil(defaultScope, a.Button) |
| 1000 | p.reconstructActiveFormattingElements() |
| 1001 | p.addElement() |
| 1002 | p.framesetOK = false |
| 1003 | case a.A: |
| 1004 | for i := len(p.afe) - 1; i >= 0 && p.afe[i].Type != scopeMarkerNode; i-- { |
| 1005 | if n := p.afe[i]; n.Type == ElementNode && n.DataAtom == a.A { |
| 1006 | p.inBodyEndTagFormatting(a.A, "a") |
| 1007 | p.oe.remove(n) |
| 1008 | p.afe.remove(n) |
| 1009 | break |
| 1010 | } |
| 1011 | } |
| 1012 | p.reconstructActiveFormattingElements() |
| 1013 | p.addFormattingElement() |
| 1014 | case a.B, a.Big, a.Code, a.Em, a.Font, a.I, a.S, a.Small, a.Strike, a.Strong, a.Tt, a.U: |
| 1015 | p.reconstructActiveFormattingElements() |
| 1016 | p.addFormattingElement() |
| 1017 | case a.Nobr: |
| 1018 | p.reconstructActiveFormattingElements() |
| 1019 | if p.elementInScope(defaultScope, a.Nobr) { |
| 1020 | p.inBodyEndTagFormatting(a.Nobr, "nobr") |
| 1021 | p.reconstructActiveFormattingElements() |
| 1022 | } |
| 1023 | p.addFormattingElement() |
| 1024 | case a.Applet, a.Marquee, a.Object: |
| 1025 | p.reconstructActiveFormattingElements() |
| 1026 | p.addElement() |
| 1027 | p.afe = append(p.afe, &scopeMarker) |
| 1028 | p.framesetOK = false |
| 1029 | case a.Table: |
| 1030 | if !p.quirks { |
| 1031 | p.popUntil(buttonScope, a.P) |
| 1032 | } |
| 1033 | p.addElement() |
| 1034 | p.framesetOK = false |
| 1035 | p.im = inTableIM |
| 1036 | return true |
| 1037 | case a.Area, a.Br, a.Embed, a.Img, a.Input, a.Keygen, a.Wbr: |
| 1038 | p.reconstructActiveFormattingElements() |
| 1039 | p.addElement() |
| 1040 | p.oe.pop() |
| 1041 | p.acknowledgeSelfClosingTag() |
| 1042 | if p.tok.DataAtom == a.Input { |
| 1043 | for _, t := range p.tok.Attr { |
| 1044 | if t.Key == "type" { |
| 1045 | if strings.EqualFold(t.Val, "hidden") { |
| 1046 | // Skip setting framesetOK = false |
| 1047 | return true |
| 1048 | } |
| 1049 | } |
| 1050 | } |
| 1051 | } |
| 1052 | p.framesetOK = false |
| 1053 | case a.Param, a.Source, a.Track: |
| 1054 | p.addElement() |
| 1055 | p.oe.pop() |
| 1056 | p.acknowledgeSelfClosingTag() |
| 1057 | case a.Hr: |
| 1058 | p.popUntil(buttonScope, a.P) |
| 1059 | p.addElement() |
| 1060 | p.oe.pop() |
| 1061 | p.acknowledgeSelfClosingTag() |
| 1062 | p.framesetOK = false |
| 1063 | case a.Image: |
| 1064 | p.tok.DataAtom = a.Img |
| 1065 | p.tok.Data = a.Img.String() |
| 1066 | return false |
| 1067 | case a.Textarea: |
| 1068 | p.addElement() |
| 1069 | p.setOriginalIM() |
| 1070 | p.framesetOK = false |
| 1071 | p.im = textIM |
| 1072 | case a.Xmp: |
| 1073 | p.popUntil(buttonScope, a.P) |
| 1074 | p.reconstructActiveFormattingElements() |
| 1075 | p.framesetOK = false |
| 1076 | p.parseGenericRawTextElement() |
| 1077 | case a.Iframe: |
| 1078 | p.framesetOK = false |
| 1079 | p.parseGenericRawTextElement() |
| 1080 | case a.Noembed: |
| 1081 | p.parseGenericRawTextElement() |
| 1082 | case a.Noscript: |
| 1083 | if p.scripting { |
| 1084 | p.parseGenericRawTextElement() |
| 1085 | return true |
| 1086 | } |
| 1087 | p.reconstructActiveFormattingElements() |
| 1088 | p.addElement() |
| 1089 | // Don't let the tokenizer go into raw text mode when scripting is disabled. |
| 1090 | p.tokenizer.NextIsNotRawText() |
| 1091 | case a.Select: |
| 1092 | p.reconstructActiveFormattingElements() |
| 1093 | p.addElement() |
| 1094 | p.framesetOK = false |
| 1095 | p.im = inSelectIM |
| 1096 | return true |
| 1097 | case a.Optgroup, a.Option: |
| 1098 | if p.top().DataAtom == a.Option { |
| 1099 | p.oe.pop() |
| 1100 | } |
| 1101 | p.reconstructActiveFormattingElements() |
| 1102 | p.addElement() |
| 1103 | case a.Rb, a.Rtc: |
| 1104 | if p.elementInScope(defaultScope, a.Ruby) { |
| 1105 | p.generateImpliedEndTags() |
| 1106 | } |
| 1107 | p.addElement() |
| 1108 | case a.Rp, a.Rt: |
| 1109 | if p.elementInScope(defaultScope, a.Ruby) { |
| 1110 | p.generateImpliedEndTags("rtc") |
| 1111 | } |
| 1112 | p.addElement() |
| 1113 | case a.Math, a.Svg: |
| 1114 | p.reconstructActiveFormattingElements() |
| 1115 | if p.tok.DataAtom == a.Math { |
| 1116 | adjustAttributeNames(p.tok.Attr, mathMLAttributeAdjustments) |
| 1117 | } else { |
| 1118 | adjustAttributeNames(p.tok.Attr, svgAttributeAdjustments) |
| 1119 | } |
| 1120 | adjustForeignAttributes(p.tok.Attr) |
| 1121 | p.addElement() |
| 1122 | p.top().Namespace = p.tok.Data |
| 1123 | if p.hasSelfClosingToken { |
| 1124 | p.oe.pop() |
| 1125 | p.acknowledgeSelfClosingTag() |
| 1126 | } |
| 1127 | return true |
| 1128 | case a.Caption, a.Col, a.Colgroup, a.Frame, a.Head, a.Tbody, a.Td, a.Tfoot, a.Th, a.Thead, a.Tr: |
| 1129 | // Ignore the token. |
| 1130 | default: |
| 1131 | p.reconstructActiveFormattingElements() |
| 1132 | p.addElement() |
| 1133 | } |
| 1134 | case EndTagToken: |
| 1135 | switch p.tok.DataAtom { |
| 1136 | case a.Body: |
| 1137 | if p.elementInScope(defaultScope, a.Body) { |
| 1138 | p.im = afterBodyIM |
| 1139 | } |
| 1140 | case a.Html: |
| 1141 | if p.elementInScope(defaultScope, a.Body) { |
| 1142 | p.parseImpliedToken(EndTagToken, a.Body, a.Body.String()) |
| 1143 | return false |
| 1144 | } |
| 1145 | return true |
| 1146 | case a.Address, a.Article, a.Aside, a.Blockquote, a.Button, a.Center, a.Details, a.Dialog, a.Dir, a.Div, a.Dl, a.Fieldset, a.Figcaption, a.Figure, a.Footer, a.Header, a.Hgroup, a.Listing, a.Main, a.Menu, a.Nav, a.Ol, a.Pre, a.Search, a.Section, a.Summary, a.Ul: |
| 1147 | p.popUntil(defaultScope, p.tok.DataAtom) |
| 1148 | case a.Form: |
| 1149 | if p.oe.contains(a.Template) { |
| 1150 | i := p.indexOfElementInScope(defaultScope, a.Form) |
| 1151 | if i == -1 { |
| 1152 | // Ignore the token. |
| 1153 | return true |
| 1154 | } |
| 1155 | p.generateImpliedEndTags() |
| 1156 | if p.oe[i].DataAtom != a.Form { |
| 1157 | // Ignore the token. |
| 1158 | return true |
| 1159 | } |
| 1160 | p.popUntil(defaultScope, a.Form) |
| 1161 | } else { |
| 1162 | node := p.form |
| 1163 | p.form = nil |
| 1164 | i := p.indexOfElementInScope(defaultScope, a.Form) |
| 1165 | if node == nil || i == -1 || p.oe[i] != node { |
| 1166 | // Ignore the token. |
| 1167 | return true |
| 1168 | } |
| 1169 | p.generateImpliedEndTags() |
| 1170 | p.oe.remove(node) |
| 1171 | } |
| 1172 | case a.P: |
| 1173 | if !p.elementInScope(buttonScope, a.P) { |
| 1174 | p.parseImpliedToken(StartTagToken, a.P, a.P.String()) |
| 1175 | } |
| 1176 | p.popUntil(buttonScope, a.P) |
| 1177 | case a.Li: |
| 1178 | p.popUntil(listItemScope, a.Li) |
| 1179 | case a.Dd, a.Dt: |
| 1180 | p.popUntil(defaultScope, p.tok.DataAtom) |
| 1181 | case a.H1, a.H2, a.H3, a.H4, a.H5, a.H6: |
| 1182 | p.popUntil(defaultScope, a.H1, a.H2, a.H3, a.H4, a.H5, a.H6) |
| 1183 | case a.A, a.B, a.Big, a.Code, a.Em, a.Font, a.I, a.Nobr, a.S, a.Small, a.Strike, a.Strong, a.Tt, a.U: |
| 1184 | p.inBodyEndTagFormatting(p.tok.DataAtom, p.tok.Data) |
| 1185 | case a.Applet, a.Marquee, a.Object: |
| 1186 | if p.popUntil(defaultScope, p.tok.DataAtom) { |
| 1187 | p.clearActiveFormattingElements() |
| 1188 | } |
| 1189 | case a.Br: |
| 1190 | p.tok.Type = StartTagToken |
| 1191 | return false |
| 1192 | case a.Template: |
| 1193 | return inHeadIM(p) |
| 1194 | default: |
| 1195 | p.inBodyEndTagOther(p.tok.DataAtom, p.tok.Data) |
| 1196 | } |
| 1197 | case CommentToken: |
| 1198 | p.addChild(&Node{ |
| 1199 | Type: CommentNode, |
| 1200 | Data: p.tok.Data, |
| 1201 | }) |
| 1202 | case ErrorToken: |
| 1203 | // TODO: remove this divergence from the HTML5 spec. |
| 1204 | if len(p.templateStack) > 0 { |
| 1205 | p.im = inTemplateIM |
| 1206 | return false |
| 1207 | } |
| 1208 | for _, e := range p.oe { |
| 1209 | switch e.DataAtom { |
| 1210 | case a.Dd, a.Dt, a.Li, a.Optgroup, a.Option, a.P, a.Rb, a.Rp, a.Rt, a.Rtc, a.Tbody, a.Td, a.Tfoot, a.Th, |
| 1211 | a.Thead, a.Tr, a.Body, a.Html: |
| 1212 | default: |
| 1213 | return true |
| 1214 | } |
| 1215 | } |
| 1216 | } |
| 1217 | |
| 1218 | return true |
| 1219 | } |
| 1220 | |
| 1221 | func (p *parser) inBodyEndTagFormatting(tagAtom a.Atom, tagName string) { |
| 1222 | // This is the "adoption agency" algorithm, described at |
| 1223 | // https://html.spec.whatwg.org/multipage/syntax.html#adoptionAgency |
| 1224 | |
| 1225 | // TODO: this is a fairly literal line-by-line translation of that algorithm. |
| 1226 | // Once the code successfully parses the comprehensive test suite, we should |
| 1227 | // refactor this code to be more idiomatic. |
| 1228 | |
| 1229 | // Steps 1-2 |
| 1230 | if current := p.oe.top(); current.Data == tagName && p.afe.index(current) == -1 { |
| 1231 | p.oe.pop() |
| 1232 | return |
| 1233 | } |
| 1234 | |
| 1235 | // Steps 3-5. The outer loop. |
| 1236 | for i := 0; i < 8; i++ { |
| 1237 | // Step 6. Find the formatting element. |
| 1238 | var formattingElement *Node |
| 1239 | for j := len(p.afe) - 1; j >= 0; j-- { |
| 1240 | if p.afe[j].Type == scopeMarkerNode { |
| 1241 | break |
| 1242 | } |
| 1243 | if p.afe[j].DataAtom == tagAtom { |
| 1244 | formattingElement = p.afe[j] |
| 1245 | break |
| 1246 | } |
| 1247 | } |
| 1248 | if formattingElement == nil { |
| 1249 | p.inBodyEndTagOther(tagAtom, tagName) |
| 1250 | return |
| 1251 | } |
| 1252 | |
| 1253 | // Step 7. Ignore the tag if formatting element is not in the stack of open elements. |
| 1254 | feIndex := p.oe.index(formattingElement) |
| 1255 | if feIndex == -1 { |
| 1256 | p.afe.remove(formattingElement) |
| 1257 | return |
| 1258 | } |
| 1259 | // Step 8. Ignore the tag if formatting element is not in the scope. |
| 1260 | if !p.elementInScope(defaultScope, tagAtom) { |
| 1261 | // Ignore the tag. |
| 1262 | return |
| 1263 | } |
| 1264 | |
| 1265 | // Step 9. This step is omitted because it's just a parse error but no need to return. |
| 1266 | |
| 1267 | // Steps 10-11. Find the furthest block. |
| 1268 | var furthestBlock *Node |
| 1269 | for _, e := range p.oe[feIndex:] { |
| 1270 | if isSpecialElement(e) { |
| 1271 | furthestBlock = e |
| 1272 | break |
| 1273 | } |
| 1274 | } |
| 1275 | if furthestBlock == nil { |
| 1276 | e := p.oe.pop() |
| 1277 | for e != formattingElement { |
| 1278 | e = p.oe.pop() |
| 1279 | } |
| 1280 | p.afe.remove(e) |
| 1281 | return |
| 1282 | } |
| 1283 | |
| 1284 | // Steps 12-13. Find the common ancestor and bookmark node. |
| 1285 | commonAncestor := p.oe[feIndex-1] |
| 1286 | bookmark := p.afe.index(formattingElement) |
| 1287 | |
| 1288 | // Step 14. The inner loop. Find the lastNode to reparent. |
| 1289 | lastNode := furthestBlock |
| 1290 | node := furthestBlock |
| 1291 | x := p.oe.index(node) |
| 1292 | // Step 14.1. |
| 1293 | j := 0 |
| 1294 | for { |
| 1295 | // Step 14.2. |
| 1296 | j++ |
| 1297 | // Step. 14.3. |
| 1298 | x-- |
| 1299 | node = p.oe[x] |
| 1300 | // Step 14.4. Go to the next step if node is formatting element. |
| 1301 | if node == formattingElement { |
| 1302 | break |
| 1303 | } |
| 1304 | // Step 14.5. Remove node from the list of active formatting elements if |
| 1305 | // inner loop counter is greater than three and node is in the list of |
| 1306 | // active formatting elements. |
| 1307 | if ni := p.afe.index(node); j > 3 && ni > -1 { |
| 1308 | p.afe.remove(node) |
| 1309 | // If any element of the list of active formatting elements is removed, |
| 1310 | // we need to take care whether bookmark should be decremented or not. |
| 1311 | // This is because the value of bookmark may exceed the size of the |
| 1312 | // list by removing elements from the list. |
| 1313 | if ni <= bookmark { |
| 1314 | bookmark-- |
| 1315 | } |
| 1316 | continue |
| 1317 | } |
| 1318 | // Step 14.6. Continue the next inner loop if node is not in the list of |
| 1319 | // active formatting elements. |
| 1320 | if p.afe.index(node) == -1 { |
| 1321 | p.oe.remove(node) |
| 1322 | continue |
| 1323 | } |
| 1324 | // Step 14.7. |
| 1325 | clone := node.clone() |
| 1326 | p.afe[p.afe.index(node)] = clone |
| 1327 | p.oe[p.oe.index(node)] = clone |
| 1328 | node = clone |
| 1329 | // Step 14.8. |
| 1330 | if lastNode == furthestBlock { |
| 1331 | bookmark = p.afe.index(node) + 1 |
| 1332 | } |
| 1333 | // Step 14.9. |
| 1334 | if lastNode.Parent != nil { |
| 1335 | lastNode.Parent.RemoveChild(lastNode) |
| 1336 | } |
| 1337 | node.AppendChild(lastNode) |
| 1338 | // Step 14.10. |
| 1339 | lastNode = node |
| 1340 | } |
| 1341 | |
| 1342 | // Step 15. Reparent lastNode to the common ancestor, |
| 1343 | // or for misnested table nodes, to the foster parent. |
| 1344 | if lastNode.Parent != nil { |
| 1345 | lastNode.Parent.RemoveChild(lastNode) |
| 1346 | } |
| 1347 | switch commonAncestor.DataAtom { |
| 1348 | case a.Table, a.Tbody, a.Tfoot, a.Thead, a.Tr: |
| 1349 | p.fosterParent(lastNode) |
| 1350 | default: |
| 1351 | commonAncestor.AppendChild(lastNode) |
| 1352 | } |
| 1353 | |
| 1354 | // Steps 16-18. Reparent nodes from the furthest block's children |
| 1355 | // to a clone of the formatting element. |
| 1356 | clone := formattingElement.clone() |
| 1357 | reparentChildren(clone, furthestBlock) |
| 1358 | furthestBlock.AppendChild(clone) |
| 1359 | |
| 1360 | // Step 19. Fix up the list of active formatting elements. |
| 1361 | if oldLoc := p.afe.index(formattingElement); oldLoc != -1 && oldLoc < bookmark { |
| 1362 | // Move the bookmark with the rest of the list. |
| 1363 | bookmark-- |
| 1364 | } |
| 1365 | p.afe.remove(formattingElement) |
| 1366 | p.afe.insert(bookmark, clone) |
| 1367 | |
| 1368 | // Step 20. Fix up the stack of open elements. |
| 1369 | p.oe.remove(formattingElement) |
| 1370 | p.oe.insert(p.oe.index(furthestBlock)+1, clone) |
| 1371 | } |
| 1372 | } |
| 1373 | |
| 1374 | // inBodyEndTagOther performs the "any other end tag" algorithm for inBodyIM. |
| 1375 | // "Any other end tag" handling from 12.2.6.5 The rules for parsing tokens in foreign content |
| 1376 | // https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-inforeign |
| 1377 | func (p *parser) inBodyEndTagOther(tagAtom a.Atom, tagName string) { |
| 1378 | for i := len(p.oe) - 1; i >= 0; i-- { |
| 1379 | // Two element nodes have the same tag if they have the same Data (a |
| 1380 | // string-typed field). As an optimization, for common HTML tags, each |
| 1381 | // Data string is assigned a unique, non-zero DataAtom (a uint32-typed |
| 1382 | // field), since integer comparison is faster than string comparison. |
| 1383 | // Uncommon (custom) tags get a zero DataAtom. |
| 1384 | // |
| 1385 | // The if condition here is equivalent to (p.oe[i].Data == tagName). |
| 1386 | if (p.oe[i].DataAtom == tagAtom) && |
| 1387 | ((tagAtom != 0) || (p.oe[i].Data == tagName)) { |
| 1388 | p.oe = p.oe[:i] |
| 1389 | break |
| 1390 | } |
| 1391 | if isSpecialElement(p.oe[i]) { |
| 1392 | break |
| 1393 | } |
| 1394 | } |
| 1395 | } |
| 1396 | |
| 1397 | // Section 12.2.6.4.8. |
| 1398 | func textIM(p *parser) bool { |
| 1399 | switch p.tok.Type { |
| 1400 | case ErrorToken: |
| 1401 | p.oe.pop() |
| 1402 | case TextToken: |
| 1403 | d := p.tok.Data |
| 1404 | if n := p.oe.top(); n.DataAtom == a.Textarea && n.FirstChild == nil { |
| 1405 | // Ignore a newline at the start of a <textarea> block. |
| 1406 | if d != "" && d[0] == '\r' { |
| 1407 | d = d[1:] |
| 1408 | } |
| 1409 | if d != "" && d[0] == '\n' { |
| 1410 | d = d[1:] |
| 1411 | } |
| 1412 | } |
| 1413 | if d == "" { |
| 1414 | return true |
| 1415 | } |
| 1416 | p.addText(d) |
| 1417 | return true |
| 1418 | case EndTagToken: |
| 1419 | p.oe.pop() |
| 1420 | } |
| 1421 | p.im = p.originalIM |
| 1422 | p.originalIM = nil |
| 1423 | return p.tok.Type == EndTagToken |
| 1424 | } |
| 1425 | |
| 1426 | // Section 12.2.6.4.9. |
| 1427 | func inTableIM(p *parser) bool { |
| 1428 | switch p.tok.Type { |
| 1429 | case TextToken: |
| 1430 | p.tok.Data = strings.Replace(p.tok.Data, "\x00", "", -1) |
| 1431 | switch p.oe.top().DataAtom { |
| 1432 | case a.Table, a.Tbody, a.Tfoot, a.Thead, a.Tr: |
| 1433 | if strings.Trim(p.tok.Data, whitespace) == "" { |
| 1434 | p.addText(p.tok.Data) |
| 1435 | return true |
| 1436 | } |
| 1437 | } |
| 1438 | case StartTagToken: |
| 1439 | switch p.tok.DataAtom { |
| 1440 | case a.Caption: |
| 1441 | p.clearStackToContext(tableScope) |
| 1442 | p.afe = append(p.afe, &scopeMarker) |
| 1443 | p.addElement() |
| 1444 | p.im = inCaptionIM |
| 1445 | return true |
| 1446 | case a.Colgroup: |
| 1447 | p.clearStackToContext(tableScope) |
| 1448 | p.addElement() |
| 1449 | p.im = inColumnGroupIM |
| 1450 | return true |
| 1451 | case a.Col: |
| 1452 | p.parseImpliedToken(StartTagToken, a.Colgroup, a.Colgroup.String()) |
| 1453 | return false |
| 1454 | case a.Tbody, a.Tfoot, a.Thead: |
| 1455 | p.clearStackToContext(tableScope) |
| 1456 | p.addElement() |
| 1457 | p.im = inTableBodyIM |
| 1458 | return true |
| 1459 | case a.Td, a.Th, a.Tr: |
| 1460 | p.parseImpliedToken(StartTagToken, a.Tbody, a.Tbody.String()) |
| 1461 | return false |
| 1462 | case a.Table: |
| 1463 | if p.popUntil(tableScope, a.Table) { |
| 1464 | p.resetInsertionMode() |
| 1465 | return false |
| 1466 | } |
| 1467 | // Ignore the token. |
| 1468 | return true |
| 1469 | case a.Style, a.Script, a.Template: |
| 1470 | return inHeadIM(p) |
| 1471 | case a.Input: |
| 1472 | for _, t := range p.tok.Attr { |
| 1473 | if t.Key == "type" && strings.EqualFold(t.Val, "hidden") { |
| 1474 | p.addElement() |
| 1475 | p.oe.pop() |
| 1476 | return true |
| 1477 | } |
| 1478 | } |
| 1479 | // Otherwise drop down to the default action. |
| 1480 | case a.Form: |
| 1481 | if p.oe.contains(a.Template) || p.form != nil { |
| 1482 | // Ignore the token. |
| 1483 | return true |
| 1484 | } |
| 1485 | p.addElement() |
| 1486 | p.form = p.oe.pop() |
| 1487 | case a.Select: |
| 1488 | p.reconstructActiveFormattingElements() |
| 1489 | switch p.top().DataAtom { |
| 1490 | case a.Table, a.Tbody, a.Tfoot, a.Thead, a.Tr: |
| 1491 | p.fosterParenting = true |
| 1492 | } |
| 1493 | p.addElement() |
| 1494 | p.fosterParenting = false |
| 1495 | p.framesetOK = false |
| 1496 | p.im = inSelectInTableIM |
| 1497 | return true |
| 1498 | } |
| 1499 | case EndTagToken: |
| 1500 | switch p.tok.DataAtom { |
| 1501 | case a.Table: |
| 1502 | if p.popUntil(tableScope, a.Table) { |
| 1503 | p.resetInsertionMode() |
| 1504 | return true |
| 1505 | } |
| 1506 | // Ignore the token. |
| 1507 | return true |
| 1508 | case a.Body, a.Caption, a.Col, a.Colgroup, a.Html, a.Tbody, a.Td, a.Tfoot, a.Th, a.Thead, a.Tr: |
| 1509 | // Ignore the token. |
| 1510 | return true |
| 1511 | case a.Template: |
| 1512 | return inHeadIM(p) |
| 1513 | } |
| 1514 | case CommentToken: |
| 1515 | p.addChild(&Node{ |
| 1516 | Type: CommentNode, |
| 1517 | Data: p.tok.Data, |
| 1518 | }) |
| 1519 | return true |
| 1520 | case DoctypeToken: |
| 1521 | // Ignore the token. |
| 1522 | return true |
| 1523 | case ErrorToken: |
| 1524 | return inBodyIM(p) |
| 1525 | } |
| 1526 | |
| 1527 | p.fosterParenting = true |
| 1528 | defer func() { p.fosterParenting = false }() |
| 1529 | |
| 1530 | return inBodyIM(p) |
| 1531 | } |
| 1532 | |
| 1533 | // Section 12.2.6.4.11. |
| 1534 | func inCaptionIM(p *parser) bool { |
| 1535 | switch p.tok.Type { |
| 1536 | case StartTagToken: |
| 1537 | switch p.tok.DataAtom { |
| 1538 | case a.Caption, a.Col, a.Colgroup, a.Tbody, a.Td, a.Tfoot, a.Thead, a.Tr: |
| 1539 | if !p.popUntil(tableScope, a.Caption) { |
| 1540 | // Ignore the token. |
| 1541 | return true |
| 1542 | } |
| 1543 | p.clearActiveFormattingElements() |
| 1544 | p.im = inTableIM |
| 1545 | return false |
| 1546 | case a.Select: |
| 1547 | p.reconstructActiveFormattingElements() |
| 1548 | p.addElement() |
| 1549 | p.framesetOK = false |
| 1550 | p.im = inSelectInTableIM |
| 1551 | return true |
| 1552 | } |
| 1553 | case EndTagToken: |
| 1554 | switch p.tok.DataAtom { |
| 1555 | case a.Caption: |
| 1556 | if p.popUntil(tableScope, a.Caption) { |
| 1557 | p.clearActiveFormattingElements() |
| 1558 | p.im = inTableIM |
| 1559 | } |
| 1560 | return true |
| 1561 | case a.Table: |
| 1562 | if !p.popUntil(tableScope, a.Caption) { |
| 1563 | // Ignore the token. |
| 1564 | return true |
| 1565 | } |
| 1566 | p.clearActiveFormattingElements() |
| 1567 | p.im = inTableIM |
| 1568 | return false |
| 1569 | case a.Body, a.Col, a.Colgroup, a.Html, a.Tbody, a.Td, a.Tfoot, a.Th, a.Thead, a.Tr: |
| 1570 | // Ignore the token. |
| 1571 | return true |
| 1572 | } |
| 1573 | } |
| 1574 | return inBodyIM(p) |
| 1575 | } |
| 1576 | |
| 1577 | // Section 12.2.6.4.12. |
| 1578 | func inColumnGroupIM(p *parser) bool { |
| 1579 | switch p.tok.Type { |
| 1580 | case TextToken: |
| 1581 | s := strings.TrimLeft(p.tok.Data, whitespace) |
| 1582 | if len(s) < len(p.tok.Data) { |
| 1583 | // Add the initial whitespace to the current node. |
| 1584 | p.addText(p.tok.Data[:len(p.tok.Data)-len(s)]) |
| 1585 | if s == "" { |
| 1586 | return true |
| 1587 | } |
| 1588 | p.tok.Data = s |
| 1589 | } |
| 1590 | case CommentToken: |
| 1591 | p.addChild(&Node{ |
| 1592 | Type: CommentNode, |
| 1593 | Data: p.tok.Data, |
| 1594 | }) |
| 1595 | return true |
| 1596 | case DoctypeToken: |
| 1597 | // Ignore the token. |
| 1598 | return true |
| 1599 | case StartTagToken: |
| 1600 | switch p.tok.DataAtom { |
| 1601 | case a.Html: |
| 1602 | return inBodyIM(p) |
| 1603 | case a.Col: |
| 1604 | p.addElement() |
| 1605 | p.oe.pop() |
| 1606 | p.acknowledgeSelfClosingTag() |
| 1607 | return true |
| 1608 | case a.Template: |
| 1609 | return inHeadIM(p) |
| 1610 | } |
| 1611 | case EndTagToken: |
| 1612 | switch p.tok.DataAtom { |
| 1613 | case a.Colgroup: |
| 1614 | if p.oe.top().DataAtom == a.Colgroup { |
| 1615 | p.oe.pop() |
| 1616 | p.im = inTableIM |
| 1617 | } |
| 1618 | return true |
| 1619 | case a.Col: |
| 1620 | // Ignore the token. |
| 1621 | return true |
| 1622 | case a.Template: |
| 1623 | return inHeadIM(p) |
| 1624 | } |
| 1625 | case ErrorToken: |
| 1626 | return inBodyIM(p) |
| 1627 | } |
| 1628 | if p.oe.top().DataAtom != a.Colgroup { |
| 1629 | return true |
| 1630 | } |
| 1631 | p.oe.pop() |
| 1632 | p.im = inTableIM |
| 1633 | return false |
| 1634 | } |
| 1635 | |
| 1636 | // Section 12.2.6.4.13. |
| 1637 | func inTableBodyIM(p *parser) bool { |
| 1638 | switch p.tok.Type { |
| 1639 | case StartTagToken: |
| 1640 | switch p.tok.DataAtom { |
| 1641 | case a.Tr: |
| 1642 | p.clearStackToContext(tableBodyScope) |
| 1643 | p.addElement() |
| 1644 | p.im = inRowIM |
| 1645 | return true |
| 1646 | case a.Td, a.Th: |
| 1647 | p.parseImpliedToken(StartTagToken, a.Tr, a.Tr.String()) |
| 1648 | return false |
| 1649 | case a.Caption, a.Col, a.Colgroup, a.Tbody, a.Tfoot, a.Thead: |
| 1650 | if p.popUntil(tableScope, a.Tbody, a.Thead, a.Tfoot) { |
| 1651 | p.im = inTableIM |
| 1652 | return false |
| 1653 | } |
| 1654 | // Ignore the token. |
| 1655 | return true |
| 1656 | } |
| 1657 | case EndTagToken: |
| 1658 | switch p.tok.DataAtom { |
| 1659 | case a.Tbody, a.Tfoot, a.Thead: |
| 1660 | if p.elementInScope(tableScope, p.tok.DataAtom) { |
| 1661 | p.clearStackToContext(tableBodyScope) |
| 1662 | p.oe.pop() |
| 1663 | p.im = inTableIM |
| 1664 | } |
| 1665 | return true |
| 1666 | case a.Table: |
| 1667 | if p.popUntil(tableScope, a.Tbody, a.Thead, a.Tfoot) { |
| 1668 | p.im = inTableIM |
| 1669 | return false |
| 1670 | } |
| 1671 | // Ignore the token. |
| 1672 | return true |
| 1673 | case a.Body, a.Caption, a.Col, a.Colgroup, a.Html, a.Td, a.Th, a.Tr: |
| 1674 | // Ignore the token. |
| 1675 | return true |
| 1676 | } |
| 1677 | case CommentToken: |
| 1678 | p.addChild(&Node{ |
| 1679 | Type: CommentNode, |
| 1680 | Data: p.tok.Data, |
| 1681 | }) |
| 1682 | return true |
| 1683 | } |
| 1684 | |
| 1685 | return inTableIM(p) |
| 1686 | } |
| 1687 | |
| 1688 | // Section 13.2.6.4.14. |
| 1689 | func inRowIM(p *parser) bool { |
| 1690 | switch p.tok.Type { |
| 1691 | case StartTagToken: |
| 1692 | switch p.tok.DataAtom { |
| 1693 | case a.Td, a.Th: |
| 1694 | p.clearStackToContext(tableRowScope) |
| 1695 | p.addElement() |
| 1696 | p.afe = append(p.afe, &scopeMarker) |
| 1697 | p.im = inCellIM |
| 1698 | return true |
| 1699 | case a.Caption, a.Col, a.Colgroup, a.Tbody, a.Tfoot, a.Thead, a.Tr: |
| 1700 | if p.elementInScope(tableScope, a.Tr) { |
| 1701 | p.clearStackToContext(tableRowScope) |
| 1702 | p.oe.pop() |
| 1703 | p.im = inTableBodyIM |
| 1704 | return false |
| 1705 | } |
| 1706 | // Ignore the token. |
| 1707 | return true |
| 1708 | } |
| 1709 | case EndTagToken: |
| 1710 | switch p.tok.DataAtom { |
| 1711 | case a.Tr: |
| 1712 | if p.elementInScope(tableScope, a.Tr) { |
| 1713 | p.clearStackToContext(tableRowScope) |
| 1714 | p.oe.pop() |
| 1715 | p.im = inTableBodyIM |
| 1716 | return true |
| 1717 | } |
| 1718 | // Ignore the token. |
| 1719 | return true |
| 1720 | case a.Table: |
| 1721 | if p.elementInScope(tableScope, a.Tr) { |
| 1722 | p.clearStackToContext(tableRowScope) |
| 1723 | p.oe.pop() |
| 1724 | p.im = inTableBodyIM |
| 1725 | return false |
| 1726 | } |
| 1727 | // Ignore the token. |
| 1728 | return true |
| 1729 | case a.Tbody, a.Tfoot, a.Thead: |
| 1730 | if p.elementInScope(tableScope, p.tok.DataAtom) && p.elementInScope(tableScope, a.Tr) { |
| 1731 | p.clearStackToContext(tableRowScope) |
| 1732 | p.oe.pop() |
| 1733 | p.im = inTableBodyIM |
| 1734 | return false |
| 1735 | } |
| 1736 | // Ignore the token. |
| 1737 | return true |
| 1738 | case a.Body, a.Caption, a.Col, a.Colgroup, a.Html, a.Td, a.Th: |
| 1739 | // Ignore the token. |
| 1740 | return true |
| 1741 | } |
| 1742 | } |
| 1743 | |
| 1744 | return inTableIM(p) |
| 1745 | } |
| 1746 | |
| 1747 | // Section 12.2.6.4.15. |
| 1748 | func inCellIM(p *parser) bool { |
| 1749 | switch p.tok.Type { |
| 1750 | case StartTagToken: |
| 1751 | switch p.tok.DataAtom { |
| 1752 | case a.Caption, a.Col, a.Colgroup, a.Tbody, a.Td, a.Tfoot, a.Th, a.Thead, a.Tr: |
| 1753 | if p.popUntil(tableScope, a.Td, a.Th) { |
| 1754 | // Close the cell and reprocess. |
| 1755 | p.clearActiveFormattingElements() |
| 1756 | p.im = inRowIM |
| 1757 | return false |
| 1758 | } |
| 1759 | // Ignore the token. |
| 1760 | return true |
| 1761 | case a.Select: |
| 1762 | p.reconstructActiveFormattingElements() |
| 1763 | p.addElement() |
| 1764 | p.framesetOK = false |
| 1765 | p.im = inSelectInTableIM |
| 1766 | return true |
| 1767 | } |
| 1768 | case EndTagToken: |
| 1769 | switch p.tok.DataAtom { |
| 1770 | case a.Td, a.Th: |
| 1771 | if !p.popUntil(tableScope, p.tok.DataAtom) { |
| 1772 | // Ignore the token. |
| 1773 | return true |
| 1774 | } |
| 1775 | p.clearActiveFormattingElements() |
| 1776 | p.im = inRowIM |
| 1777 | return true |
| 1778 | case a.Body, a.Caption, a.Col, a.Colgroup, a.Html: |
| 1779 | // Ignore the token. |
| 1780 | return true |
| 1781 | case a.Table, a.Tbody, a.Tfoot, a.Thead, a.Tr: |
| 1782 | if !p.elementInScope(tableScope, p.tok.DataAtom) { |
| 1783 | // Ignore the token. |
| 1784 | return true |
| 1785 | } |
| 1786 | // Close the cell and reprocess. |
| 1787 | if p.popUntil(tableScope, a.Td, a.Th) { |
| 1788 | p.clearActiveFormattingElements() |
| 1789 | } |
| 1790 | p.im = inRowIM |
| 1791 | return false |
| 1792 | } |
| 1793 | } |
| 1794 | return inBodyIM(p) |
| 1795 | } |
| 1796 | |
| 1797 | // Section 12.2.6.4.16. |
| 1798 | func inSelectIM(p *parser) bool { |
| 1799 | switch p.tok.Type { |
| 1800 | case TextToken: |
| 1801 | p.addText(strings.Replace(p.tok.Data, "\x00", "", -1)) |
| 1802 | case StartTagToken: |
| 1803 | switch p.tok.DataAtom { |
| 1804 | case a.Html: |
| 1805 | return inBodyIM(p) |
| 1806 | case a.Option: |
| 1807 | if p.top().DataAtom == a.Option { |
| 1808 | p.oe.pop() |
| 1809 | } |
| 1810 | p.addElement() |
| 1811 | case a.Optgroup: |
| 1812 | if p.top().DataAtom == a.Option { |
| 1813 | p.oe.pop() |
| 1814 | } |
| 1815 | if p.top().DataAtom == a.Optgroup { |
| 1816 | p.oe.pop() |
| 1817 | } |
| 1818 | p.addElement() |
| 1819 | case a.Select: |
| 1820 | if !p.popUntil(selectScope, a.Select) { |
| 1821 | // Ignore the token. |
| 1822 | return true |
| 1823 | } |
| 1824 | p.resetInsertionMode() |
| 1825 | case a.Input, a.Keygen, a.Textarea: |
| 1826 | if p.elementInScope(selectScope, a.Select) { |
| 1827 | p.parseImpliedToken(EndTagToken, a.Select, a.Select.String()) |
| 1828 | return false |
| 1829 | } |
| 1830 | // In order to properly ignore <textarea>, we need to change the tokenizer mode. |
| 1831 | p.tokenizer.NextIsNotRawText() |
| 1832 | // Ignore the token. |
| 1833 | return true |
| 1834 | case a.Script, a.Template: |
| 1835 | return inHeadIM(p) |
| 1836 | case a.Iframe, a.Noembed, a.Noframes, a.Noscript, a.Plaintext, a.Style, a.Title, a.Xmp: |
| 1837 | // Don't let the tokenizer go into raw text mode when there are raw tags |
| 1838 | // to be ignored. These tags should be ignored from the tokenizer |
| 1839 | // properly. |
| 1840 | p.tokenizer.NextIsNotRawText() |
| 1841 | // Ignore the token. |
| 1842 | return true |
| 1843 | } |
| 1844 | case EndTagToken: |
| 1845 | switch p.tok.DataAtom { |
| 1846 | case a.Option: |
| 1847 | if p.top().DataAtom == a.Option { |
| 1848 | p.oe.pop() |
| 1849 | } |
| 1850 | case a.Optgroup: |
| 1851 | i := len(p.oe) - 1 |
| 1852 | if p.oe[i].DataAtom == a.Option { |
| 1853 | i-- |
| 1854 | } |
| 1855 | if p.oe[i].DataAtom == a.Optgroup { |
| 1856 | p.oe = p.oe[:i] |
| 1857 | } |
| 1858 | case a.Select: |
| 1859 | if !p.popUntil(selectScope, a.Select) { |
| 1860 | // Ignore the token. |
| 1861 | return true |
| 1862 | } |
| 1863 | p.resetInsertionMode() |
| 1864 | case a.Template: |
| 1865 | return inHeadIM(p) |
| 1866 | } |
| 1867 | case CommentToken: |
| 1868 | p.addChild(&Node{ |
| 1869 | Type: CommentNode, |
| 1870 | Data: p.tok.Data, |
| 1871 | }) |
| 1872 | case DoctypeToken: |
| 1873 | // Ignore the token. |
| 1874 | return true |
| 1875 | case ErrorToken: |
| 1876 | return inBodyIM(p) |
| 1877 | } |
| 1878 | |
| 1879 | return true |
| 1880 | } |
| 1881 | |
| 1882 | // Section 12.2.6.4.17. |
| 1883 | func inSelectInTableIM(p *parser) bool { |
| 1884 | switch p.tok.Type { |
| 1885 | case StartTagToken, EndTagToken: |
| 1886 | switch p.tok.DataAtom { |
| 1887 | case a.Caption, a.Table, a.Tbody, a.Tfoot, a.Thead, a.Tr, a.Td, a.Th: |
| 1888 | if p.tok.Type == EndTagToken && !p.elementInScope(tableScope, p.tok.DataAtom) { |
| 1889 | // Ignore the token. |
| 1890 | return true |
| 1891 | } |
| 1892 | // This is like p.popUntil(selectScope, a.Select), but it also |
| 1893 | // matches <math select>, not just <select>. Matching the MathML |
| 1894 | // tag is arguably incorrect (conceptually), but it mimics what |
| 1895 | // Chromium does. |
| 1896 | for i := len(p.oe) - 1; i >= 0; i-- { |
| 1897 | if n := p.oe[i]; n.DataAtom == a.Select { |
| 1898 | p.oe = p.oe[:i] |
| 1899 | break |
| 1900 | } |
| 1901 | } |
| 1902 | p.resetInsertionMode() |
| 1903 | return false |
| 1904 | } |
| 1905 | } |
| 1906 | return inSelectIM(p) |
| 1907 | } |
| 1908 | |
| 1909 | // Section 12.2.6.4.18. |
| 1910 | func inTemplateIM(p *parser) bool { |
| 1911 | switch p.tok.Type { |
| 1912 | case TextToken, CommentToken, DoctypeToken: |
| 1913 | return inBodyIM(p) |
| 1914 | case StartTagToken: |
| 1915 | switch p.tok.DataAtom { |
| 1916 | case a.Base, a.Basefont, a.Bgsound, a.Link, a.Meta, a.Noframes, a.Script, a.Style, a.Template, a.Title: |
| 1917 | return inHeadIM(p) |
| 1918 | case a.Caption, a.Colgroup, a.Tbody, a.Tfoot, a.Thead: |
| 1919 | p.templateStack.pop() |
| 1920 | p.templateStack = append(p.templateStack, inTableIM) |
| 1921 | p.im = inTableIM |
| 1922 | return false |
| 1923 | case a.Col: |
| 1924 | p.templateStack.pop() |
| 1925 | p.templateStack = append(p.templateStack, inColumnGroupIM) |
| 1926 | p.im = inColumnGroupIM |
| 1927 | return false |
| 1928 | case a.Tr: |
| 1929 | p.templateStack.pop() |
| 1930 | p.templateStack = append(p.templateStack, inTableBodyIM) |
| 1931 | p.im = inTableBodyIM |
| 1932 | return false |
| 1933 | case a.Td, a.Th: |
| 1934 | p.templateStack.pop() |
| 1935 | p.templateStack = append(p.templateStack, inRowIM) |
| 1936 | p.im = inRowIM |
| 1937 | return false |
| 1938 | default: |
| 1939 | p.templateStack.pop() |
| 1940 | p.templateStack = append(p.templateStack, inBodyIM) |
| 1941 | p.im = inBodyIM |
| 1942 | return false |
| 1943 | } |
| 1944 | case EndTagToken: |
| 1945 | switch p.tok.DataAtom { |
| 1946 | case a.Template: |
| 1947 | return inHeadIM(p) |
| 1948 | default: |
| 1949 | // Ignore the token. |
| 1950 | return true |
| 1951 | } |
| 1952 | case ErrorToken: |
| 1953 | if !p.oe.contains(a.Template) { |
| 1954 | // Ignore the token. |
| 1955 | return true |
| 1956 | } |
| 1957 | // TODO: remove this divergence from the HTML5 spec. |
| 1958 | // |
| 1959 | // See https://bugs.chromium.org/p/chromium/issues/detail?id=829668 |
| 1960 | p.generateImpliedEndTags() |
| 1961 | for i := len(p.oe) - 1; i >= 0; i-- { |
| 1962 | if n := p.oe[i]; n.Namespace == "" && n.DataAtom == a.Template { |
| 1963 | p.oe = p.oe[:i] |
| 1964 | break |
| 1965 | } |
| 1966 | } |
| 1967 | p.clearActiveFormattingElements() |
| 1968 | p.templateStack.pop() |
| 1969 | p.resetInsertionMode() |
| 1970 | return false |
| 1971 | } |
| 1972 | return false |
| 1973 | } |
| 1974 | |
| 1975 | // Section 12.2.6.4.19. |
| 1976 | func afterBodyIM(p *parser) bool { |
| 1977 | switch p.tok.Type { |
| 1978 | case ErrorToken: |
| 1979 | // Stop parsing. |
| 1980 | return true |
| 1981 | case TextToken: |
| 1982 | s := strings.TrimLeft(p.tok.Data, whitespace) |
| 1983 | if len(s) == 0 { |
| 1984 | // It was all whitespace. |
| 1985 | return inBodyIM(p) |
| 1986 | } |
| 1987 | case StartTagToken: |
| 1988 | if p.tok.DataAtom == a.Html { |
| 1989 | return inBodyIM(p) |
| 1990 | } |
| 1991 | case EndTagToken: |
| 1992 | if p.tok.DataAtom == a.Html { |
| 1993 | if !p.fragment { |
| 1994 | p.im = afterAfterBodyIM |
| 1995 | } |
| 1996 | return true |
| 1997 | } |
| 1998 | case CommentToken: |
| 1999 | // The comment is attached to the <html> element. |
| 2000 | if len(p.oe) < 1 || p.oe[0].DataAtom != a.Html { |
| 2001 | panic("html: bad parser state: <html> element not found, in the after-body insertion mode") |
| 2002 | } |
| 2003 | p.oe[0].AppendChild(&Node{ |
| 2004 | Type: CommentNode, |
| 2005 | Data: p.tok.Data, |
| 2006 | }) |
| 2007 | return true |
| 2008 | } |
| 2009 | p.im = inBodyIM |
| 2010 | return false |
| 2011 | } |
| 2012 | |
| 2013 | // Section 12.2.6.4.20. |
| 2014 | func inFramesetIM(p *parser) bool { |
| 2015 | switch p.tok.Type { |
| 2016 | case CommentToken: |
| 2017 | p.addChild(&Node{ |
| 2018 | Type: CommentNode, |
| 2019 | Data: p.tok.Data, |
| 2020 | }) |
| 2021 | case TextToken: |
| 2022 | // Ignore all text but whitespace. |
| 2023 | s := strings.Map(func(c rune) rune { |
| 2024 | switch c { |
| 2025 | case ' ', '\t', '\n', '\f', '\r': |
| 2026 | return c |
| 2027 | } |
| 2028 | return -1 |
| 2029 | }, p.tok.Data) |
| 2030 | if s != "" { |
| 2031 | p.addText(s) |
| 2032 | } |
| 2033 | case StartTagToken: |
| 2034 | switch p.tok.DataAtom { |
| 2035 | case a.Html: |
| 2036 | return inBodyIM(p) |
| 2037 | case a.Frameset: |
| 2038 | p.addElement() |
| 2039 | case a.Frame: |
| 2040 | p.addElement() |
| 2041 | p.oe.pop() |
| 2042 | p.acknowledgeSelfClosingTag() |
| 2043 | case a.Noframes: |
| 2044 | return inHeadIM(p) |
| 2045 | } |
| 2046 | case EndTagToken: |
| 2047 | switch p.tok.DataAtom { |
| 2048 | case a.Frameset: |
| 2049 | if p.oe.top().DataAtom != a.Html { |
| 2050 | p.oe.pop() |
| 2051 | if p.oe.top().DataAtom != a.Frameset { |
| 2052 | p.im = afterFramesetIM |
| 2053 | return true |
| 2054 | } |
| 2055 | } |
| 2056 | } |
| 2057 | default: |
| 2058 | // Ignore the token. |
| 2059 | } |
| 2060 | return true |
| 2061 | } |
| 2062 | |
| 2063 | // Section 12.2.6.4.21. |
| 2064 | func afterFramesetIM(p *parser) bool { |
| 2065 | switch p.tok.Type { |
| 2066 | case CommentToken: |
| 2067 | p.addChild(&Node{ |
| 2068 | Type: CommentNode, |
| 2069 | Data: p.tok.Data, |
| 2070 | }) |
| 2071 | case TextToken: |
| 2072 | // Ignore all text but whitespace. |
| 2073 | s := strings.Map(func(c rune) rune { |
| 2074 | switch c { |
| 2075 | case ' ', '\t', '\n', '\f', '\r': |
| 2076 | return c |
| 2077 | } |
| 2078 | return -1 |
| 2079 | }, p.tok.Data) |
| 2080 | if s != "" { |
| 2081 | p.addText(s) |
| 2082 | } |
| 2083 | case StartTagToken: |
| 2084 | switch p.tok.DataAtom { |
| 2085 | case a.Html: |
| 2086 | return inBodyIM(p) |
| 2087 | case a.Noframes: |
| 2088 | return inHeadIM(p) |
| 2089 | } |
| 2090 | case EndTagToken: |
| 2091 | switch p.tok.DataAtom { |
| 2092 | case a.Html: |
| 2093 | p.im = afterAfterFramesetIM |
| 2094 | return true |
| 2095 | } |
| 2096 | default: |
| 2097 | // Ignore the token. |
| 2098 | } |
| 2099 | return true |
| 2100 | } |
| 2101 | |
| 2102 | // Section 12.2.6.4.22. |
| 2103 | func afterAfterBodyIM(p *parser) bool { |
| 2104 | switch p.tok.Type { |
| 2105 | case ErrorToken: |
| 2106 | // Stop parsing. |
| 2107 | return true |
| 2108 | case TextToken: |
| 2109 | s := strings.TrimLeft(p.tok.Data, whitespace) |
| 2110 | if len(s) == 0 { |
| 2111 | // It was all whitespace. |
| 2112 | return inBodyIM(p) |
| 2113 | } |
| 2114 | case StartTagToken: |
| 2115 | if p.tok.DataAtom == a.Html { |
| 2116 | return inBodyIM(p) |
| 2117 | } |
| 2118 | case CommentToken: |
| 2119 | p.doc.AppendChild(&Node{ |
| 2120 | Type: CommentNode, |
| 2121 | Data: p.tok.Data, |
| 2122 | }) |
| 2123 | return true |
| 2124 | case DoctypeToken: |
| 2125 | return inBodyIM(p) |
| 2126 | } |
| 2127 | p.im = inBodyIM |
| 2128 | return false |
| 2129 | } |
| 2130 | |
| 2131 | // Section 12.2.6.4.23. |
| 2132 | func afterAfterFramesetIM(p *parser) bool { |
| 2133 | switch p.tok.Type { |
| 2134 | case CommentToken: |
| 2135 | p.doc.AppendChild(&Node{ |
| 2136 | Type: CommentNode, |
| 2137 | Data: p.tok.Data, |
| 2138 | }) |
| 2139 | case TextToken: |
| 2140 | // Ignore all text but whitespace. |
| 2141 | s := strings.Map(func(c rune) rune { |
| 2142 | switch c { |
| 2143 | case ' ', '\t', '\n', '\f', '\r': |
| 2144 | return c |
| 2145 | } |
| 2146 | return -1 |
| 2147 | }, p.tok.Data) |
| 2148 | if s != "" { |
| 2149 | p.tok.Data = s |
| 2150 | return inBodyIM(p) |
| 2151 | } |
| 2152 | case StartTagToken: |
| 2153 | switch p.tok.DataAtom { |
| 2154 | case a.Html: |
| 2155 | return inBodyIM(p) |
| 2156 | case a.Noframes: |
| 2157 | return inHeadIM(p) |
| 2158 | } |
| 2159 | case DoctypeToken: |
| 2160 | return inBodyIM(p) |
| 2161 | default: |
| 2162 | // Ignore the token. |
| 2163 | } |
| 2164 | return true |
| 2165 | } |
| 2166 | |
| 2167 | func ignoreTheRemainingTokens(p *parser) bool { |
| 2168 | return true |
| 2169 | } |
| 2170 | |
| 2171 | const whitespaceOrNUL = whitespace + "\x00" |
| 2172 | |
| 2173 | // Section 12.2.6.5 |
| 2174 | func parseForeignContent(p *parser) bool { |
| 2175 | switch p.tok.Type { |
| 2176 | case TextToken: |
| 2177 | if p.framesetOK { |
| 2178 | p.framesetOK = strings.TrimLeft(p.tok.Data, whitespaceOrNUL) == "" |
| 2179 | } |
| 2180 | p.tok.Data = strings.Replace(p.tok.Data, "\x00", "\ufffd", -1) |
| 2181 | p.addText(p.tok.Data) |
| 2182 | case CommentToken: |
| 2183 | p.addChild(&Node{ |
| 2184 | Type: CommentNode, |
| 2185 | Data: p.tok.Data, |
| 2186 | }) |
| 2187 | case StartTagToken: |
| 2188 | if !p.fragment { |
| 2189 | b := breakout[p.tok.Data] |
| 2190 | if p.tok.DataAtom == a.Font { |
| 2191 | loop: |
| 2192 | for _, attr := range p.tok.Attr { |
| 2193 | switch attr.Key { |
| 2194 | case "color", "face", "size": |
| 2195 | b = true |
| 2196 | break loop |
| 2197 | } |
| 2198 | } |
| 2199 | } |
| 2200 | if b { |
| 2201 | for i := len(p.oe) - 1; i >= 0; i-- { |
| 2202 | n := p.oe[i] |
| 2203 | if n.Namespace == "" || htmlIntegrationPoint(n) || mathMLTextIntegrationPoint(n) { |
| 2204 | p.oe = p.oe[:i+1] |
| 2205 | break |
| 2206 | } |
| 2207 | } |
| 2208 | return false |
| 2209 | } |
| 2210 | } |
| 2211 | current := p.adjustedCurrentNode() |
| 2212 | switch current.Namespace { |
| 2213 | case "math": |
| 2214 | adjustAttributeNames(p.tok.Attr, mathMLAttributeAdjustments) |
| 2215 | case "svg": |
| 2216 | // Adjust SVG tag names. The tokenizer lower-cases tag names, but |
| 2217 | // SVG wants e.g. "foreignObject" with a capital second "O". |
| 2218 | if x := svgTagNameAdjustments[p.tok.Data]; x != "" { |
| 2219 | p.tok.DataAtom = a.Lookup([]byte(x)) |
| 2220 | p.tok.Data = x |
| 2221 | } |
| 2222 | adjustAttributeNames(p.tok.Attr, svgAttributeAdjustments) |
| 2223 | default: |
| 2224 | panic("html: bad parser state: unexpected namespace") |
| 2225 | } |
| 2226 | adjustForeignAttributes(p.tok.Attr) |
| 2227 | namespace := current.Namespace |
| 2228 | p.addElement() |
| 2229 | p.top().Namespace = namespace |
| 2230 | if namespace != "" { |
| 2231 | // Don't let the tokenizer go into raw text mode in foreign content |
| 2232 | // (e.g. in an SVG <title> tag). |
| 2233 | p.tokenizer.NextIsNotRawText() |
| 2234 | } |
| 2235 | if p.hasSelfClosingToken { |
| 2236 | p.oe.pop() |
| 2237 | p.acknowledgeSelfClosingTag() |
| 2238 | } |
| 2239 | case EndTagToken: |
| 2240 | if strings.EqualFold(p.oe[len(p.oe)-1].Data, p.tok.Data) { |
| 2241 | p.oe = p.oe[:len(p.oe)-1] |
| 2242 | return true |
| 2243 | } |
| 2244 | for i := len(p.oe) - 1; i >= 0; i-- { |
| 2245 | if strings.EqualFold(p.oe[i].Data, p.tok.Data) { |
| 2246 | p.oe = p.oe[:i] |
| 2247 | return true |
| 2248 | } |
| 2249 | if i > 0 && p.oe[i-1].Namespace == "" { |
| 2250 | break |
| 2251 | } |
| 2252 | } |
| 2253 | return p.im(p) |
| 2254 | default: |
| 2255 | // Ignore the token. |
| 2256 | } |
| 2257 | return true |
| 2258 | } |
| 2259 | |
| 2260 | // Section 12.2.4.2. |
| 2261 | func (p *parser) adjustedCurrentNode() *Node { |
| 2262 | if len(p.oe) == 1 && p.fragment && p.context != nil { |
| 2263 | return p.context |
| 2264 | } |
| 2265 | return p.oe.top() |
| 2266 | } |
| 2267 | |
| 2268 | // Section 12.2.6. |
| 2269 | func (p *parser) inForeignContent() bool { |
| 2270 | if len(p.oe) == 0 { |
| 2271 | return false |
| 2272 | } |
| 2273 | n := p.adjustedCurrentNode() |
| 2274 | if n.Namespace == "" { |
| 2275 | return false |
| 2276 | } |
| 2277 | if mathMLTextIntegrationPoint(n) { |
| 2278 | if p.tok.Type == StartTagToken && p.tok.DataAtom != a.Mglyph && p.tok.DataAtom != a.Malignmark { |
| 2279 | return false |
| 2280 | } |
| 2281 | if p.tok.Type == TextToken { |
| 2282 | return false |
| 2283 | } |
| 2284 | } |
| 2285 | if n.Namespace == "math" && n.DataAtom == a.AnnotationXml && p.tok.Type == StartTagToken && p.tok.DataAtom == a.Svg { |
| 2286 | return false |
| 2287 | } |
| 2288 | if htmlIntegrationPoint(n) && (p.tok.Type == StartTagToken || p.tok.Type == TextToken) { |
| 2289 | return false |
| 2290 | } |
| 2291 | if p.tok.Type == ErrorToken { |
| 2292 | return false |
| 2293 | } |
| 2294 | return true |
| 2295 | } |
| 2296 | |
| 2297 | // parseImpliedToken parses a token as though it had appeared in the parser's |
| 2298 | // input. |
| 2299 | func (p *parser) parseImpliedToken(t TokenType, dataAtom a.Atom, data string) { |
| 2300 | realToken, selfClosing := p.tok, p.hasSelfClosingToken |
| 2301 | p.tok = Token{ |
| 2302 | Type: t, |
| 2303 | DataAtom: dataAtom, |
| 2304 | Data: data, |
| 2305 | } |
| 2306 | p.hasSelfClosingToken = false |
| 2307 | p.parseCurrentToken() |
| 2308 | p.tok, p.hasSelfClosingToken = realToken, selfClosing |
| 2309 | } |
| 2310 | |
| 2311 | // parseCurrentToken runs the current token through the parsing routines |
| 2312 | // until it is consumed. |
| 2313 | func (p *parser) parseCurrentToken() { |
| 2314 | if p.tok.Type == SelfClosingTagToken { |
| 2315 | p.hasSelfClosingToken = true |
| 2316 | p.tok.Type = StartTagToken |
| 2317 | } |
| 2318 | |
| 2319 | consumed := false |
| 2320 | for !consumed { |
| 2321 | if p.inForeignContent() { |
| 2322 | consumed = parseForeignContent(p) |
| 2323 | } else { |
| 2324 | consumed = p.im(p) |
| 2325 | } |
| 2326 | } |
| 2327 | |
| 2328 | if p.hasSelfClosingToken { |
| 2329 | // This is a parse error, but ignore it. |
| 2330 | p.hasSelfClosingToken = false |
| 2331 | } |
| 2332 | } |
| 2333 | |
| 2334 | func (p *parser) parse() (err error) { |
| 2335 | defer func() { |
| 2336 | if panicErr := recover(); panicErr != nil { |
| 2337 | err = fmt.Errorf("%s", panicErr) |
| 2338 | } |
| 2339 | }() |
| 2340 | // Iterate until EOF. Any other error will cause an early return. |
| 2341 | for err != io.EOF { |
| 2342 | // CDATA sections are allowed only in foreign content. |
| 2343 | n := p.oe.top() |
| 2344 | p.tokenizer.AllowCDATA(n != nil && n.Namespace != "") |
| 2345 | // Read and parse the next token. |
| 2346 | p.tokenizer.Next() |
| 2347 | p.tok = p.tokenizer.Token() |
| 2348 | if p.tok.Type == ErrorToken { |
| 2349 | err = p.tokenizer.Err() |
| 2350 | if err != nil && err != io.EOF { |
| 2351 | return err |
| 2352 | } |
| 2353 | } |
| 2354 | p.parseCurrentToken() |
| 2355 | } |
| 2356 | return nil |
| 2357 | } |
| 2358 | |
| 2359 | // Parse returns the parse tree for the HTML from the given Reader. |
| 2360 | // |
| 2361 | // It implements the HTML5 parsing algorithm |
| 2362 | // (https://html.spec.whatwg.org/multipage/syntax.html#tree-construction), |
| 2363 | // which is very complicated. The resultant tree can contain implicitly created |
| 2364 | // nodes that have no explicit <tag> listed in r's data, and nodes' parents can |
| 2365 | // differ from the nesting implied by a naive processing of start and end |
| 2366 | // <tag>s. Conversely, explicit <tag>s in r's data can be silently dropped, |
| 2367 | // with no corresponding node in the resulting tree. |
| 2368 | // |
| 2369 | // Parse will reject HTML that is nested deeper than 512 elements. |
| 2370 | // |
| 2371 | // The input is assumed to be UTF-8 encoded. |
| 2372 | func Parse(r io.Reader) (*Node, error) { |
| 2373 | return ParseWithOptions(r) |
| 2374 | } |
| 2375 | |
| 2376 | // ParseFragment parses a fragment of HTML and returns the nodes that were |
| 2377 | // found. If the fragment is the InnerHTML for an existing element, pass that |
| 2378 | // element in context. |
| 2379 | // |
| 2380 | // It has the same intricacies as Parse. |
| 2381 | func ParseFragment(r io.Reader, context *Node) ([]*Node, error) { |
| 2382 | return ParseFragmentWithOptions(r, context) |
| 2383 | } |
| 2384 | |
| 2385 | // ParseOption configures a parser. |
| 2386 | type ParseOption func(p *parser) |
| 2387 | |
| 2388 | // ParseOptionEnableScripting configures the scripting flag. |
| 2389 | // https://html.spec.whatwg.org/multipage/webappapis.html#enabling-and-disabling-scripting |
| 2390 | // |
| 2391 | // By default, scripting is enabled. |
| 2392 | func ParseOptionEnableScripting(enable bool) ParseOption { |
| 2393 | return func(p *parser) { |
| 2394 | p.scripting = enable |
| 2395 | } |
| 2396 | } |
| 2397 | |
| 2398 | // ParseWithOptions is like Parse, with options. |
| 2399 | func ParseWithOptions(r io.Reader, opts ...ParseOption) (*Node, error) { |
| 2400 | p := &parser{ |
| 2401 | tokenizer: NewTokenizer(r), |
| 2402 | doc: &Node{ |
| 2403 | Type: DocumentNode, |
| 2404 | }, |
| 2405 | scripting: true, |
| 2406 | framesetOK: true, |
| 2407 | im: initialIM, |
| 2408 | } |
| 2409 | |
| 2410 | for _, f := range opts { |
| 2411 | f(p) |
| 2412 | } |
| 2413 | |
| 2414 | if err := p.parse(); err != nil { |
| 2415 | return nil, err |
| 2416 | } |
| 2417 | return p.doc, nil |
| 2418 | } |
| 2419 | |
| 2420 | // ParseFragmentWithOptions is like ParseFragment, with options. |
| 2421 | func ParseFragmentWithOptions(r io.Reader, context *Node, opts ...ParseOption) ([]*Node, error) { |
| 2422 | contextTag := "" |
| 2423 | if context != nil { |
| 2424 | if context.Type != ElementNode { |
| 2425 | return nil, errors.New("html: ParseFragment of non-element Node") |
| 2426 | } |
| 2427 | // The next check isn't just context.DataAtom.String() == context.Data because |
| 2428 | // it is valid to pass an element whose tag isn't a known atom. For example, |
| 2429 | // DataAtom == 0 and Data = "tagfromthefuture" is perfectly consistent. |
| 2430 | if context.DataAtom != a.Lookup([]byte(context.Data)) { |
| 2431 | return nil, fmt.Errorf("html: inconsistent Node: DataAtom=%q, Data=%q", context.DataAtom, context.Data) |
| 2432 | } |
| 2433 | contextTag = context.DataAtom.String() |
| 2434 | } |
| 2435 | p := &parser{ |
| 2436 | doc: &Node{ |
| 2437 | Type: DocumentNode, |
| 2438 | }, |
| 2439 | scripting: true, |
| 2440 | fragment: true, |
| 2441 | context: context, |
| 2442 | } |
| 2443 | if context != nil && context.Namespace != "" { |
| 2444 | p.tokenizer = NewTokenizer(r) |
| 2445 | } else { |
| 2446 | p.tokenizer = NewTokenizerFragment(r, contextTag) |
| 2447 | } |
| 2448 | |
| 2449 | for _, f := range opts { |
| 2450 | f(p) |
| 2451 | } |
| 2452 | |
| 2453 | root := &Node{ |
| 2454 | Type: ElementNode, |
| 2455 | DataAtom: a.Html, |
| 2456 | Data: a.Html.String(), |
| 2457 | } |
| 2458 | p.doc.AppendChild(root) |
| 2459 | p.oe = nodeStack{root} |
| 2460 | if context != nil && context.DataAtom == a.Template { |
| 2461 | p.templateStack = append(p.templateStack, inTemplateIM) |
| 2462 | } |
| 2463 | p.resetInsertionMode() |
| 2464 | |
| 2465 | for n := context; n != nil; n = n.Parent { |
| 2466 | if n.Type == ElementNode && n.DataAtom == a.Form { |
| 2467 | p.form = n |
| 2468 | break |
| 2469 | } |
| 2470 | } |
| 2471 | |
| 2472 | if err := p.parse(); err != nil { |
| 2473 | return nil, err |
| 2474 | } |
| 2475 | |
| 2476 | parent := p.doc |
| 2477 | if context != nil { |
| 2478 | parent = root |
| 2479 | } |
| 2480 | |
| 2481 | var result []*Node |
| 2482 | for c := parent.FirstChild; c != nil; { |
| 2483 | next := c.NextSibling |
| 2484 | parent.RemoveChild(c) |
| 2485 | result = append(result, c) |
| 2486 | c = next |
| 2487 | } |
| 2488 | return result, nil |
| 2489 | } |