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html: parse and render comment nodes.

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The first additional test case in parse_test.go is:
<!--><div>--<!-->

The second one is unrelated to the comment change, but also passes:
<p><hr></p>

R=andybalholm
CC=golang-dev
https://golang.org/cl/5299047
This commit is contained in:
Nigel Tao 2011-10-20 11:45:30 +11:00
parent 57d07e32d8
commit 64306c9fd0
3 changed files with 92 additions and 8 deletions
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84
src/pkg/html/parse.go
View File

@ -236,8 +236,15 @@ func (p *parser) setOriginalIM(im insertionMode) {
// Section 11.2.5.4.1.
func initialIM(p *parser) (insertionMode, bool) {
if p.tok.Type == DoctypeToken {
p.addChild(&Node{
switch p.tok.Type {
case CommentToken:
p.doc.Add(&Node{
Type: CommentNode,
Data: p.tok.Data,
})
return initialIM, true
case DoctypeToken:
p.doc.Add(&Node{
Type: DoctypeNode,
Data: p.tok.Data,
})
@ -275,6 +282,12 @@ func beforeHTMLIM(p *parser) (insertionMode, bool) {
default:
// Ignore the token.
}
case CommentToken:
p.doc.Add(&Node{
Type: CommentNode,
Data: p.tok.Data,
})
return beforeHTMLIM, true
}
if add || implied {
p.addElement("html", attr)
@ -312,6 +325,12 @@ func beforeHeadIM(p *parser) (insertionMode, bool) {
default:
// Ignore the token.
}
case CommentToken:
p.addChild(&Node{
Type: CommentNode,
Data: p.tok.Data,
})
return beforeHeadIM, true
}
if add || implied {
p.addElement("head", attr)
@ -344,11 +363,17 @@ func inHeadIM(p *parser) (insertionMode, bool) {
pop = true
}
// TODO.
case CommentToken:
p.addChild(&Node{
Type: CommentNode,
Data: p.tok.Data,
})
return inHeadIM, true
}
if pop || implied {
n := p.oe.pop()
if n.Data != "head" {
panic("html: bad parser state")
panic("html: bad parser state: <head> element not found, in the in-head insertion mode")
}
return afterHeadIM, !implied
}
@ -387,6 +412,12 @@ func afterHeadIM(p *parser) (insertionMode, bool) {
}
case EndTagToken:
// TODO.
case CommentToken:
p.addChild(&Node{
Type: CommentNode,
Data: p.tok.Data,
})
return afterHeadIM, true
}
if add || implied {
p.addElement("body", attr)
@ -469,6 +500,11 @@ func inBodyIM(p *parser) (insertionMode, bool) {
p.oe.pop()
}
}
case CommentToken:
p.addChild(&Node{
Type: CommentNode,
Data: p.tok.Data,
})
}
return inBodyIM, true
@ -644,6 +680,12 @@ func inTableIM(p *parser) (insertionMode, bool) {
// Ignore the token.
return inTableIM, true
}
case CommentToken:
p.addChild(&Node{
Type: CommentNode,
Data: p.tok.Data,
})
return inTableIM, true
}
if add {
// TODO: clear the stack back to a table context.
@ -693,6 +735,12 @@ func inTableBodyIM(p *parser) (insertionMode, bool) {
// Ignore the token.
return inTableBodyIM, true
}
case CommentToken:
p.addChild(&Node{
Type: CommentNode,
Data: p.tok.Data,
})
return inTableBodyIM, true
}
if add {
// TODO: clear the stack back to a table body context.
@ -737,6 +785,12 @@ func inRowIM(p *parser) (insertionMode, bool) {
default:
// TODO.
}
case CommentToken:
p.addChild(&Node{
Type: CommentNode,
Data: p.tok.Data,
})
return inRowIM, true
}
return useTheRulesFor(p, inRowIM, inTableIM)
}
@ -763,6 +817,12 @@ func inCellIM(p *parser) (insertionMode, bool) {
// TODO: check for matching element in table scope.
closeTheCellAndReprocess = true
}
case CommentToken:
p.addChild(&Node{
Type: CommentNode,
Data: p.tok.Data,
})
return inCellIM, true
}
if closeTheCellAndReprocess {
if p.popUntil(tableScopeStopTags, "td") || p.popUntil(tableScopeStopTags, "th") {
@ -790,7 +850,18 @@ func afterBodyIM(p *parser) (insertionMode, bool) {
default:
// TODO.
}
case CommentToken:
// The comment is attached to the <html> element.
if len(p.oe) < 1 || p.oe[0].Data != "html" {
panic("html: bad parser state: <html> element not found, in the after-body insertion mode")
}
p.oe[0].Add(&Node{
Type: CommentNode,
Data: p.tok.Data,
})
return afterBodyIM, true
}
// TODO: should this be "return inBodyIM, true"?
return afterBodyIM, true
}
@ -806,6 +877,12 @@ func afterAfterBodyIM(p *parser) (insertionMode, bool) {
if p.tok.Data == "html" {
return useTheRulesFor(p, afterAfterBodyIM, inBodyIM)
}
case CommentToken:
p.doc.Add(&Node{
Type: CommentNode,
Data: p.tok.Data,
})
return afterAfterBodyIM, true
}
return inBodyIM, false
}
@ -821,6 +898,7 @@ func Parse(r io.Reader) (*Node, os.Error) {
scripting: true,
framesetOK: true,
}
p.tokenizer.ReturnComments = true
// Iterate until EOF. Any other error will cause an early return.
im, consumed := initialIM, true
for {

4
src/pkg/html/parse_test.go
View File

@ -84,7 +84,7 @@ func dumpLevel(w io.Writer, n *Node, level int) os.Error {
case TextNode:
fmt.Fprintf(w, "%q", n.Data)
case CommentNode:
return os.NewError("COMMENT")
fmt.Fprintf(w, "<!-- %s -->", n.Data)
case DoctypeNode:
fmt.Fprintf(w, "<!DOCTYPE %s>", n.Data)
case scopeMarkerNode:
@ -123,7 +123,7 @@ func TestParser(t *testing.T) {
rc := make(chan io.Reader)
go readDat(filename, rc)
// TODO(nigeltao): Process all test cases, not just a subset.
for i := 0; i < 27; i++ {
for i := 0; i < 29; i++ {
// Parse the #data section.
b, err := ioutil.ReadAll(<-rc)
if err != nil {

12
src/pkg/html/render.go
View File

@ -30,9 +30,6 @@ type writer interface {
// would become a tree containing <html>, <head> and <body> elements. Another
// example is that the programmatic equivalent of "a<head>b</head>c" becomes
// "<html><head><head/><body>abc</body></html>".
//
// Comment nodes are elided from the output, analogous to Parse skipping over
// any <!--comment--> input.
func Render(w io.Writer, n *Node) os.Error {
if x, ok := w.(writer); ok {
return render(x, n)
@ -61,6 +58,15 @@ func render(w writer, n *Node) os.Error {
case ElementNode:
// No-op.
case CommentNode:
if _, err := w.WriteString("<!--"); err != nil {
return err
}
if _, err := w.WriteString(n.Data); err != nil {
return err
}
if _, err := w.WriteString("-->"); err != nil {
return err
}
return nil
case DoctypeNode:
if _, err := w.WriteString("<!DOCTYPE "); err != nil {