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-rw-r--r--src/pkg/html/parse.go800
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diff --git a/src/pkg/html/parse.go b/src/pkg/html/parse.go
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+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package html
+
+import (
+ "io"
+ "os"
+)
+
+// A parser implements the HTML5 parsing algorithm:
+// http://www.whatwg.org/specs/web-apps/current-work/multipage/tokenization.html#tree-construction
+type parser struct {
+ // tokenizer provides the tokens for the parser.
+ tokenizer *Tokenizer
+ // tok is the most recently read token.
+ tok Token
+ // Self-closing tags like <hr/> are re-interpreted as a two-token sequence:
+ // <hr> followed by </hr>. hasSelfClosingToken is true if we have just read
+ // the synthetic start tag and the next one due is the matching end tag.
+ hasSelfClosingToken bool
+ // doc is the document root element.
+ doc *Node
+ // The stack of open elements (section 11.2.3.2) and active formatting
+ // elements (section 11.2.3.3).
+ oe, afe nodeStack
+ // Element pointers (section 11.2.3.4).
+ head, form *Node
+ // Other parsing state flags (section 11.2.3.5).
+ scripting, framesetOK bool
+}
+
+func (p *parser) top() *Node {
+ if n := p.oe.top(); n != nil {
+ return n
+ }
+ return p.doc
+}
+
+// stopTags for use in popUntil. These come from section 11.2.3.2.
+var (
+ defaultScopeStopTags = []string{"applet", "caption", "html", "table", "td", "th", "marquee", "object"}
+ listItemScopeStopTags = []string{"applet", "caption", "html", "table", "td", "th", "marquee", "object", "ol", "ul"}
+ buttonScopeStopTags = []string{"applet", "caption", "html", "table", "td", "th", "marquee", "object", "button"}
+ tableScopeStopTags = []string{"html", "table"}
+)
+
+// popUntil pops the stack of open elements at the highest element whose tag
+// is in matchTags, provided there is no higher element in stopTags. It returns
+// whether or not there was such an element. If there was not, popUntil leaves
+// the stack unchanged.
+//
+// For example, if the stack was:
+// ["html", "body", "font", "table", "b", "i", "u"]
+// then popUntil([]string{"html, "table"}, "font") would return false, but
+// popUntil([]string{"html, "table"}, "i") would return true and the resultant
+// stack would be:
+// ["html", "body", "font", "table", "b"]
+//
+// If an element's tag is in both stopTags and matchTags, then the stack will
+// be popped and the function returns true (provided, of course, there was no
+// higher element in the stack that was also in stopTags). For example,
+// popUntil([]string{"html, "table"}, "table") would return true and leave:
+// ["html", "body", "font"]
+func (p *parser) popUntil(stopTags []string, matchTags ...string) bool {
+ for i := len(p.oe) - 1; i >= 0; i-- {
+ tag := p.oe[i].Data
+ for _, t := range matchTags {
+ if t == tag {
+ p.oe = p.oe[:i]
+ return true
+ }
+ }
+ for _, t := range stopTags {
+ if t == tag {
+ return false
+ }
+ }
+ }
+ return false
+}
+
+// addChild adds a child node n to the top element, and pushes n onto the stack
+// of open elements if it is an element node.
+func (p *parser) addChild(n *Node) {
+ p.top().Add(n)
+ if n.Type == ElementNode {
+ p.oe = append(p.oe, n)
+ }
+}
+
+// addText adds text to the preceding node if it is a text node, or else it
+// calls addChild with a new text node.
+func (p *parser) addText(text string) {
+ // TODO: distinguish whitespace text from others.
+ t := p.top()
+ if i := len(t.Child); i > 0 && t.Child[i-1].Type == TextNode {
+ t.Child[i-1].Data += text
+ return
+ }
+ p.addChild(&Node{
+ Type: TextNode,
+ Data: text,
+ })
+}
+
+// addElement calls addChild with an element node.
+func (p *parser) addElement(tag string, attr []Attribute) {
+ p.addChild(&Node{
+ Type: ElementNode,
+ Data: tag,
+ Attr: attr,
+ })
+}
+
+// Section 11.2.3.3.
+func (p *parser) addFormattingElement(tag string, attr []Attribute) {
+ p.addElement(tag, attr)
+ p.afe = append(p.afe, p.top())
+ // TODO.
+}
+
+// Section 11.2.3.3.
+func (p *parser) clearActiveFormattingElements() {
+ for {
+ n := p.afe.pop()
+ if len(p.afe) == 0 || n.Type == scopeMarkerNode {
+ return
+ }
+ }
+}
+
+// Section 11.2.3.3.
+func (p *parser) reconstructActiveFormattingElements() {
+ n := p.afe.top()
+ if n == nil {
+ return
+ }
+ if n.Type == scopeMarkerNode || p.oe.index(n) != -1 {
+ return
+ }
+ i := len(p.afe) - 1
+ for n.Type != scopeMarkerNode && p.oe.index(n) == -1 {
+ if i == 0 {
+ i = -1
+ break
+ }
+ i--
+ n = p.afe[i]
+ }
+ for {
+ i++
+ n = p.afe[i]
+ p.addChild(n.clone())
+ p.afe[i] = n
+ if i == len(p.afe)-1 {
+ break
+ }
+ }
+}
+
+// read reads the next token. This is usually from the tokenizer, but it may
+// be the synthesized end tag implied by a self-closing tag.
+func (p *parser) read() os.Error {
+ if p.hasSelfClosingToken {
+ p.hasSelfClosingToken = false
+ p.tok.Type = EndTagToken
+ p.tok.Attr = nil
+ return nil
+ }
+ p.tokenizer.Next()
+ p.tok = p.tokenizer.Token()
+ switch p.tok.Type {
+ case ErrorToken:
+ return p.tokenizer.Error()
+ case SelfClosingTagToken:
+ p.hasSelfClosingToken = true
+ p.tok.Type = StartTagToken
+ }
+ return nil
+}
+
+// Section 11.2.4.
+func (p *parser) acknowledgeSelfClosingTag() {
+ p.hasSelfClosingToken = false
+}
+
+// An insertion mode (section 11.2.3.1) is the state transition function from
+// a particular state in the HTML5 parser's state machine. It updates the
+// parser's fields depending on parser.token (where ErrorToken means EOF). In
+// addition to returning the next insertionMode state, it also returns whether
+// the token was consumed.
+type insertionMode func(*parser) (insertionMode, bool)
+
+// useTheRulesFor runs the delegate insertionMode over p, returning the actual
+// insertionMode unless the delegate caused a state transition.
+// Section 11.2.3.1, "using the rules for".
+func useTheRulesFor(p *parser, actual, delegate insertionMode) (insertionMode, bool) {
+ im, consumed := delegate(p)
+ if im != delegate {
+ return im, consumed
+ }
+ return actual, consumed
+}
+
+// Section 11.2.5.4.1.
+func initialIM(p *parser) (insertionMode, bool) {
+ if p.tok.Type == DoctypeToken {
+ p.addChild(&Node{
+ Type: DoctypeNode,
+ Data: p.tok.Data,
+ })
+ return beforeHTMLIM, true
+ }
+ // TODO: set "quirks mode"? It's defined in the DOM spec instead of HTML5 proper,
+ // and so switching on "quirks mode" might belong in a different package.
+ return beforeHTMLIM, false
+}
+
+// Section 11.2.5.4.2.
+func beforeHTMLIM(p *parser) (insertionMode, bool) {
+ var (
+ add bool
+ attr []Attribute
+ implied bool
+ )
+ switch p.tok.Type {
+ case ErrorToken:
+ implied = true
+ case TextToken:
+ // TODO: distinguish whitespace text from others.
+ implied = true
+ case StartTagToken:
+ if p.tok.Data == "html" {
+ add = true
+ attr = p.tok.Attr
+ } else {
+ implied = true
+ }
+ case EndTagToken:
+ switch p.tok.Data {
+ case "head", "body", "html", "br":
+ implied = true
+ default:
+ // Ignore the token.
+ }
+ }
+ if add || implied {
+ p.addElement("html", attr)
+ }
+ return beforeHeadIM, !implied
+}
+
+// Section 11.2.5.4.3.
+func beforeHeadIM(p *parser) (insertionMode, bool) {
+ var (
+ add bool
+ attr []Attribute
+ implied bool
+ )
+ switch p.tok.Type {
+ case ErrorToken:
+ implied = true
+ case TextToken:
+ // TODO: distinguish whitespace text from others.
+ implied = true
+ case StartTagToken:
+ switch p.tok.Data {
+ case "head":
+ add = true
+ attr = p.tok.Attr
+ case "html":
+ return useTheRulesFor(p, beforeHeadIM, inBodyIM)
+ default:
+ implied = true
+ }
+ case EndTagToken:
+ switch p.tok.Data {
+ case "head", "body", "html", "br":
+ implied = true
+ default:
+ // Ignore the token.
+ }
+ }
+ if add || implied {
+ p.addElement("head", attr)
+ }
+ return inHeadIM, !implied
+}
+
+// Section 11.2.5.4.4.
+func inHeadIM(p *parser) (insertionMode, bool) {
+ var (
+ pop bool
+ implied bool
+ )
+ switch p.tok.Type {
+ case ErrorToken, TextToken:
+ implied = true
+ case StartTagToken:
+ switch p.tok.Data {
+ case "meta":
+ // TODO.
+ case "script":
+ // TODO.
+ default:
+ implied = true
+ }
+ case EndTagToken:
+ if p.tok.Data == "head" {
+ pop = true
+ }
+ // TODO.
+ }
+ if pop || implied {
+ n := p.oe.pop()
+ if n.Data != "head" {
+ panic("html: bad parser state")
+ }
+ return afterHeadIM, !implied
+ }
+ return inHeadIM, !implied
+}
+
+// Section 11.2.5.4.6.
+func afterHeadIM(p *parser) (insertionMode, bool) {
+ var (
+ add bool
+ attr []Attribute
+ framesetOK bool
+ implied bool
+ )
+ switch p.tok.Type {
+ case ErrorToken, TextToken:
+ implied = true
+ framesetOK = true
+ case StartTagToken:
+ switch p.tok.Data {
+ case "html":
+ // TODO.
+ case "body":
+ add = true
+ attr = p.tok.Attr
+ framesetOK = false
+ case "frameset":
+ // TODO.
+ case "base", "basefont", "bgsound", "link", "meta", "noframes", "script", "style", "title":
+ // TODO.
+ case "head":
+ // TODO.
+ default:
+ implied = true
+ framesetOK = true
+ }
+ case EndTagToken:
+ // TODO.
+ }
+ if add || implied {
+ p.addElement("body", attr)
+ p.framesetOK = framesetOK
+ }
+ return inBodyIM, !implied
+}
+
+// Section 11.2.5.4.7.
+func inBodyIM(p *parser) (insertionMode, bool) {
+ var endP bool
+ switch p.tok.Type {
+ case TextToken:
+ p.reconstructActiveFormattingElements()
+ p.addText(p.tok.Data)
+ p.framesetOK = false
+ case StartTagToken:
+ switch p.tok.Data {
+ case "address", "article", "aside", "blockquote", "center", "details", "dir", "div", "dl", "fieldset", "figcaption", "figure", "footer", "header", "hgroup", "menu", "nav", "ol", "p", "section", "summary", "ul":
+ // TODO: Do the proper "does the stack of open elements has a p element in button scope" algorithm in section 11.2.3.2.
+ n := p.top()
+ if n.Type == ElementNode && n.Data == "p" {
+ endP = true
+ } else {
+ p.addElement(p.tok.Data, p.tok.Attr)
+ }
+ case "h1", "h2", "h3", "h4", "h5", "h6":
+ // TODO: auto-insert </p> if necessary.
+ switch n := p.top(); n.Data {
+ case "h1", "h2", "h3", "h4", "h5", "h6":
+ p.oe.pop()
+ }
+ p.addElement(p.tok.Data, p.tok.Attr)
+ case "a":
+ if n := p.afe.forTag("a"); n != nil {
+ p.inBodyEndTagFormatting("a")
+ p.oe.remove(n)
+ p.afe.remove(n)
+ }
+ p.reconstructActiveFormattingElements()
+ p.addFormattingElement(p.tok.Data, p.tok.Attr)
+ case "b", "big", "code", "em", "font", "i", "s", "small", "strike", "strong", "tt", "u":
+ p.reconstructActiveFormattingElements()
+ p.addFormattingElement(p.tok.Data, p.tok.Attr)
+ case "area", "br", "embed", "img", "input", "keygen", "wbr":
+ p.reconstructActiveFormattingElements()
+ p.addElement(p.tok.Data, p.tok.Attr)
+ p.oe.pop()
+ p.acknowledgeSelfClosingTag()
+ p.framesetOK = false
+ case "table":
+ // TODO: auto-insert </p> if necessary, depending on quirks mode.
+ p.addElement(p.tok.Data, p.tok.Attr)
+ p.framesetOK = false
+ return inTableIM, true
+ case "hr":
+ // TODO: auto-insert </p> if necessary.
+ p.addElement(p.tok.Data, p.tok.Attr)
+ p.oe.pop()
+ p.acknowledgeSelfClosingTag()
+ p.framesetOK = false
+ default:
+ // TODO.
+ p.addElement(p.tok.Data, p.tok.Attr)
+ }
+ case EndTagToken:
+ switch p.tok.Data {
+ case "body":
+ // TODO: autoclose the stack of open elements.
+ return afterBodyIM, true
+ case "a", "b", "big", "code", "em", "font", "i", "nobr", "s", "small", "strike", "strong", "tt", "u":
+ p.inBodyEndTagFormatting(p.tok.Data)
+ default:
+ // TODO: any other end tag
+ if p.tok.Data == p.top().Data {
+ p.oe.pop()
+ }
+ }
+ }
+ if endP {
+ // TODO: do the proper algorithm.
+ n := p.oe.pop()
+ if n.Type != ElementNode || n.Data != "p" {
+ panic("unreachable")
+ }
+ }
+ return inBodyIM, !endP
+}
+
+func (p *parser) inBodyEndTagFormatting(tag string) {
+ // This is the "adoption agency" algorithm, described at
+ // http://www.whatwg.org/specs/web-apps/current-work/multipage/tokenization.html#adoptionAgency
+
+ // TODO: this is a fairly literal line-by-line translation of that algorithm.
+ // Once the code successfully parses the comprehensive test suite, we should
+ // refactor this code to be more idiomatic.
+
+ // Steps 1-3. The outer loop.
+ for i := 0; i < 8; i++ {
+ // Step 4. Find the formatting element.
+ var formattingElement *Node
+ for j := len(p.afe) - 1; j >= 0; j-- {
+ if p.afe[j].Type == scopeMarkerNode {
+ break
+ }
+ if p.afe[j].Data == tag {
+ formattingElement = p.afe[j]
+ break
+ }
+ }
+ if formattingElement == nil {
+ return
+ }
+ feIndex := p.oe.index(formattingElement)
+ if feIndex == -1 {
+ p.afe.remove(formattingElement)
+ return
+ }
+
+ // Steps 5-6. Find the furthest block.
+ var furthestBlock *Node
+ for _, e := range p.oe[feIndex:] {
+ if isSpecialElement[e.Data] {
+ furthestBlock = e
+ break
+ }
+ }
+ if furthestBlock == nil {
+ e := p.oe.pop()
+ for e != formattingElement {
+ e = p.oe.pop()
+ }
+ p.afe.remove(e)
+ return
+ }
+
+ // Steps 7-8. Find the common ancestor and bookmark node.
+ commonAncestor := p.oe[feIndex-1]
+ bookmark := p.afe.index(formattingElement)
+
+ // Step 9. The inner loop. Find the lastNode to reparent.
+ lastNode := furthestBlock
+ node := furthestBlock
+ x := p.oe.index(node)
+ // Steps 9.1-9.3.
+ for j := 0; j < 3; j++ {
+ // Step 9.4.
+ x--
+ node = p.oe[x]
+ // Step 9.5.
+ if p.afe.index(node) == -1 {
+ p.oe.remove(node)
+ continue
+ }
+ // Step 9.6.
+ if node == formattingElement {
+ break
+ }
+ // Step 9.7.
+ clone := node.clone()
+ p.afe[p.afe.index(node)] = clone
+ p.oe[p.oe.index(node)] = clone
+ node = clone
+ // Step 9.8.
+ if lastNode == furthestBlock {
+ bookmark = p.afe.index(node) + 1
+ }
+ // Step 9.9.
+ if lastNode.Parent != nil {
+ lastNode.Parent.Remove(lastNode)
+ }
+ node.Add(lastNode)
+ // Step 9.10.
+ lastNode = node
+ }
+
+ // Step 10. Reparent lastNode to the common ancestor,
+ // or for misnested table nodes, to the foster parent.
+ if lastNode.Parent != nil {
+ lastNode.Parent.Remove(lastNode)
+ }
+ switch commonAncestor.Data {
+ case "table", "tbody", "tfoot", "thead", "tr":
+ // TODO: fix up misnested table nodes; find the foster parent.
+ fallthrough
+ default:
+ commonAncestor.Add(lastNode)
+ }
+
+ // Steps 11-13. Reparent nodes from the furthest block's children
+ // to a clone of the formatting element.
+ clone := formattingElement.clone()
+ reparentChildren(clone, furthestBlock)
+ furthestBlock.Add(clone)
+
+ // Step 14. Fix up the list of active formatting elements.
+ p.afe.remove(formattingElement)
+ p.afe.insert(bookmark, clone)
+
+ // Step 15. Fix up the stack of open elements.
+ p.oe.remove(formattingElement)
+ p.oe.insert(p.oe.index(furthestBlock)+1, clone)
+ }
+}
+
+// Section 11.2.5.4.9.
+func inTableIM(p *parser) (insertionMode, bool) {
+ var (
+ add bool
+ data string
+ attr []Attribute
+ consumed bool
+ )
+ switch p.tok.Type {
+ case ErrorToken:
+ // Stop parsing.
+ return nil, true
+ case TextToken:
+ // TODO.
+ case StartTagToken:
+ switch p.tok.Data {
+ case "tbody", "tfoot", "thead":
+ add = true
+ data = p.tok.Data
+ attr = p.tok.Attr
+ consumed = true
+ case "td", "th", "tr":
+ add = true
+ data = "tbody"
+ default:
+ // TODO.
+ }
+ case EndTagToken:
+ switch p.tok.Data {
+ case "table":
+ if p.popUntil(tableScopeStopTags, "table") {
+ // TODO: "reset the insertion mode appropriately" as per 11.2.3.1.
+ return inBodyIM, false
+ }
+ // Ignore the token.
+ return inTableIM, true
+ case "body", "caption", "col", "colgroup", "html", "tbody", "td", "tfoot", "th", "thead", "tr":
+ // Ignore the token.
+ return inTableIM, true
+ }
+ }
+ if add {
+ // TODO: clear the stack back to a table context.
+ p.addElement(data, attr)
+ return inTableBodyIM, consumed
+ }
+ // TODO: return useTheRulesFor(inTableIM, inBodyIM, p) unless etc. etc. foster parenting.
+ return inTableIM, true
+}
+
+// Section 11.2.5.4.13.
+func inTableBodyIM(p *parser) (insertionMode, bool) {
+ var (
+ add bool
+ data string
+ attr []Attribute
+ consumed bool
+ )
+ switch p.tok.Type {
+ case ErrorToken:
+ // TODO.
+ case TextToken:
+ // TODO.
+ case StartTagToken:
+ switch p.tok.Data {
+ case "tr":
+ add = true
+ data = p.tok.Data
+ attr = p.tok.Attr
+ consumed = true
+ case "td", "th":
+ add = true
+ data = "tr"
+ consumed = false
+ default:
+ // TODO.
+ }
+ case EndTagToken:
+ switch p.tok.Data {
+ case "table":
+ if p.popUntil(tableScopeStopTags, "tbody", "thead", "tfoot") {
+ return inTableIM, false
+ }
+ // Ignore the token.
+ return inTableBodyIM, true
+ case "body", "caption", "col", "colgroup", "html", "td", "th", "tr":
+ // Ignore the token.
+ return inTableBodyIM, true
+ }
+ }
+ if add {
+ // TODO: clear the stack back to a table body context.
+ p.addElement(data, attr)
+ return inRowIM, consumed
+ }
+ return useTheRulesFor(p, inTableBodyIM, inTableIM)
+}
+
+// Section 11.2.5.4.14.
+func inRowIM(p *parser) (insertionMode, bool) {
+ switch p.tok.Type {
+ case ErrorToken:
+ // TODO.
+ case TextToken:
+ // TODO.
+ case StartTagToken:
+ switch p.tok.Data {
+ case "td", "th":
+ // TODO: clear the stack back to a table row context.
+ p.addElement(p.tok.Data, p.tok.Attr)
+ p.afe = append(p.afe, &scopeMarker)
+ return inCellIM, true
+ default:
+ // TODO.
+ }
+ case EndTagToken:
+ switch p.tok.Data {
+ case "tr":
+ // TODO.
+ case "table":
+ if p.popUntil(tableScopeStopTags, "tr") {
+ return inTableBodyIM, false
+ }
+ // Ignore the token.
+ return inRowIM, true
+ case "tbody", "tfoot", "thead":
+ // TODO.
+ case "body", "caption", "col", "colgroup", "html", "td", "th":
+ // Ignore the token.
+ return inRowIM, true
+ default:
+ // TODO.
+ }
+ }
+ return useTheRulesFor(p, inRowIM, inTableIM)
+}
+
+// Section 11.2.5.4.15.
+func inCellIM(p *parser) (insertionMode, bool) {
+ var (
+ closeTheCellAndReprocess bool
+ )
+ switch p.tok.Type {
+ case StartTagToken:
+ switch p.tok.Data {
+ case "caption", "col", "colgroup", "tbody", "td", "tfoot", "th", "thead", "tr":
+ // TODO: check for "td" or "th" in table scope.
+ closeTheCellAndReprocess = true
+ }
+ case EndTagToken:
+ switch p.tok.Data {
+ case "td", "th":
+ // TODO.
+ case "body", "caption", "col", "colgroup", "html":
+ // TODO.
+ case "table", "tbody", "tfoot", "thead", "tr":
+ // TODO: check for matching element in table scope.
+ closeTheCellAndReprocess = true
+ }
+ }
+ if closeTheCellAndReprocess {
+ if p.popUntil(tableScopeStopTags, "td") || p.popUntil(tableScopeStopTags, "th") {
+ p.clearActiveFormattingElements()
+ return inRowIM, false
+ }
+ }
+ return useTheRulesFor(p, inCellIM, inBodyIM)
+}
+
+// Section 11.2.5.4.18.
+func afterBodyIM(p *parser) (insertionMode, bool) {
+ switch p.tok.Type {
+ case ErrorToken:
+ // TODO.
+ case TextToken:
+ // TODO.
+ case StartTagToken:
+ // TODO.
+ case EndTagToken:
+ switch p.tok.Data {
+ case "html":
+ // TODO: autoclose the stack of open elements.
+ return afterAfterBodyIM, true
+ default:
+ // TODO.
+ }
+ }
+ return afterBodyIM, true
+}
+
+// Section 11.2.5.4.21.
+func afterAfterBodyIM(p *parser) (insertionMode, bool) {
+ switch p.tok.Type {
+ case ErrorToken:
+ // Stop parsing.
+ return nil, true
+ case TextToken:
+ // TODO.
+ case StartTagToken:
+ if p.tok.Data == "html" {
+ return useTheRulesFor(p, afterAfterBodyIM, inBodyIM)
+ }
+ }
+ return inBodyIM, false
+}
+
+// Parse returns the parse tree for the HTML from the given Reader.
+// The input is assumed to be UTF-8 encoded.
+func Parse(r io.Reader) (*Node, os.Error) {
+ p := &parser{
+ tokenizer: NewTokenizer(r),
+ doc: &Node{
+ Type: DocumentNode,
+ },
+ scripting: true,
+ framesetOK: true,
+ }
+ // Iterate until EOF. Any other error will cause an early return.
+ im, consumed := initialIM, true
+ for {
+ if consumed {
+ if err := p.read(); err != nil {
+ if err == os.EOF {
+ break
+ }
+ return nil, err
+ }
+ }
+ im, consumed = im(p)
+ }
+ // Loop until the final token (the ErrorToken signifying EOF) is consumed.
+ for {
+ if im, consumed = im(p); consumed {
+ break
+ }
+ }
+ return p.doc, nil
+}
generated by cgit v1.2.3 (git 2.39.1) at 2025-07-24 06:21:15 +0000