html: adjust foreign attributes.

Pass tests10.dat, test 22: <!DOCTYPE html><body xlink:href=foo><svg xlink:href=foo></svg> | <!DOCTYPE html> | <html> | <head> | <body> | xlink:href="foo" | <svg svg> | xlink href="foo" Also pass tests through test 29: <div><svg><path></svg><path> R=andybalholm CC=golang-dev https://golang.org/cl/5489117

html: adjust foreign attributes.
d5e45e3a · Nigel Tao · b28f0175 · d5e45e3a · d5e45e3a · d5e45e3a
Commit d5e45e3a authored Dec 25, 2011 by Nigel Tao
Showing with 49 additions and 8 deletions

foreign.go src/pkg/html/foreign.go +19 -0

parse.go src/pkg/html/parse.go +2 -2

parse_test.go src/pkg/html/parse_test.go +14 -3

render.go src/pkg/html/render.go +8 -0

token.go src/pkg/html/token.go +6 -3

No files found.
--- a/src/pkg/html/foreign.go
+++ b/src/pkg/html/foreign.go
@@ -4,6 +4,25 @@

 package html

+import (
+	"strings"
+)
+
+func adjustForeignAttributes(aa []Attribute) {
+	for i, a := range aa {
+		if a.Key == "" || a.Key[0] != 'x' {
+			continue
+		}
+		switch a.Key {
+		case "xlink:actuate", "xlink:arcrole", "xlink:href", "xlink:role", "xlink:show",
+			"xlink:title", "xlink:type", "xml:base", "xml:lang", "xml:space", "xmlns:xlink":
+			j := strings.Index(a.Key, ":")
+			aa[i].Namespace = a.Key[:j]
+			aa[i].Key = a.Key[j+1:]
+		}
+	}
+}
+
 // Section 12.2.5.5.
 var breakout = map[string]bool{
 	"b":          true,

--- a/src/pkg/html/parse.go
+++ b/src/pkg/html/parse.go
@@ -807,7 +807,7 @@ func inBodyIM(p *parser) bool {
 				// TODO: adjust SVG attributes.
 				namespace = "svg"
 			}
-			// TODO: adjust foreign attributes.
+			adjustForeignAttributes(p.tok.Attr)
 			p.addElement(p.tok.Data, p.tok.Attr)
 			p.top().Namespace = namespace
 			return true
@@ -1678,7 +1678,7 @@ func parseForeignContent(p *parser) bool {
 		default:
 			panic("html: bad parser state: unexpected namespace")
 		}
-		// TODO: adjust foreign attributes.
+		adjustForeignAttributes(p.tok.Attr)
 		p.addElement(p.tok.Data, p.tok.Attr)
 	case EndTagToken:
 		for i := len(p.oe) - 1; i >= 0; i-- {

--- a/src/pkg/html/parse_test.go
+++ b/src/pkg/html/parse_test.go
@@ -103,10 +103,21 @@ func dumpLevel(w io.Writer, n *Node, level int) error {
 		} else {
 			fmt.Fprintf(w, "<%s>", n.Data)
 		}
-		for _, a := range n.Attr {
+		attr := n.Attr
+		if len(attr) == 2 && attr[0].Namespace == "xml" && attr[1].Namespace == "xlink" {
+			// Some of the test cases in tests10.dat change the order of adjusted
+			// foreign attributes, but that behavior is not in the spec, and could
+			// simply be an implementation detail of html5lib's python map ordering.
+			attr[0], attr[1] = attr[1], attr[0]
+		}
+		for _, a := range attr {
 			io.WriteString(w, "\n")
 			dumpIndent(w, level+1)
-			fmt.Fprintf(w, `%s="%s"`, a.Key, a.Val)
+			if a.Namespace != "" {
+				fmt.Fprintf(w, `%s %s="%s"`, a.Namespace, a.Key, a.Val)
+			} else {
+				fmt.Fprintf(w, `%s="%s"`, a.Key, a.Val)
+			}
 		}
 	case TextNode:
 		fmt.Fprintf(w, `"%s"`, n.Data)
@@ -173,7 +184,7 @@ func TestParser(t *testing.T) {
 		{"tests4.dat", -1},
 		{"tests5.dat", -1},
 		{"tests6.dat", 47},
-		{"tests10.dat", 22},
+		{"tests10.dat", 30},
 	}
 	for _, tf := range testFiles {
 		f, err := os.Open("testdata/webkit/" + tf.filename)

--- a/src/pkg/html/render.go
+++ b/src/pkg/html/render.go
@@ -149,6 +149,14 @@ func render1(w writer, n *Node) error {
 		if err := w.WriteByte(' '); err != nil {
 			return err
 		}
+		if a.Namespace != "" {
+			if _, err := w.WriteString(a.Namespace); err != nil {
+				return err
+			}
+			if err := w.WriteByte(':'); err != nil {
+				return err
+			}
+		}
 		if _, err := w.WriteString(a.Key); err != nil {
 			return err
 		}

--- a/src/pkg/html/token.go
+++ b/src/pkg/html/token.go
@@ -52,11 +52,14 @@ func (t TokenType) String() string {
 	return "Invalid(" + strconv.Itoa(int(t)) + ")"
 }

-// An Attribute is an attribute key-value pair. Key is alphabetic (and hence
+// An Attribute is an attribute namespace-key-value triple. Namespace is
+// non-empty for foreign attributes like xlink, Key is alphabetic (and hence
 // does not contain escapable characters like '&', '<' or '>'), and Val is
 // unescaped (it looks like "a<b" rather than "a&lt;b").
+//
+// Namespace is only used by the parser, not the tokenizer.
 type Attribute struct {
-	Key, Val string
+	Namespace, Key, Val string
 }

 // A Token consists of a TokenType and some Data (tag name for start and end
@@ -756,7 +759,7 @@ func (z *Tokenizer) Token() Token {
 		for moreAttr {
 			var key, val []byte
 			key, val, moreAttr = z.TagAttr()
-			attr = append(attr, Attribute{string(key), string(val)})
+			attr = append(attr, Attribute{"", string(key), string(val)})
 		}
 		t.Data = string(name)
 		t.Attr = attr