--- /dev/null
+// Copyright 2011 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 (
+ "strings"
+)
+
+// parseDoctype parses the data from a DoctypeToken into a name,
+// public identifier, and system identifier. It returns a Node whose Type
+// is DoctypeNode, whose Data is the name, and which has attributes
+// named "system" and "public" for the two identifiers if they were present.
+// quirks is whether the document should be parsed in "quirks mode".
+func parseDoctype(s string) (n *Node, quirks bool) {
+ n = &Node{Type: DoctypeNode}
+
+ // Find the name.
+ space := strings.IndexAny(s, whitespace)
+ if space == -1 {
+ space = len(s)
+ }
+ n.Data = s[:space]
+ // The comparison to "html" is case-sensitive.
+ if n.Data != "html" {
+ quirks = true
+ }
+ n.Data = strings.ToLower(n.Data)
+ s = strings.TrimLeft(s[space:], whitespace)
+
+ if len(s) < 6 {
+ // It can't start with "PUBLIC" or "SYSTEM".
+ // Ignore the rest of the string.
+ return n, quirks || s != ""
+ }
+
+ key := strings.ToLower(s[:6])
+ s = s[6:]
+ for key == "public" || key == "system" {
+ s = strings.TrimLeft(s, whitespace)
+ if s == "" {
+ break
+ }
+ quote := s[0]
+ if quote != '"' && quote != '\'' {
+ break
+ }
+ s = s[1:]
+ q := strings.IndexRune(s, rune(quote))
+ var id string
+ if q == -1 {
+ id = s
+ s = ""
+ } else {
+ id = s[:q]
+ s = s[q+1:]
+ }
+ n.Attr = append(n.Attr, Attribute{Key: key, Val: id})
+ if key == "public" {
+ key = "system"
+ } else {
+ key = ""
+ }
+ }
+
+ if key != "" || s != "" {
+ quirks = true
+ } else if len(n.Attr) > 0 {
+ if n.Attr[0].Key == "public" {
+ public := strings.ToLower(n.Attr[0].Val)
+ switch public {
+ case "-//w3o//dtd w3 html strict 3.0//en//", "-/w3d/dtd html 4.0 transitional/en", "html":
+ quirks = true
+ default:
+ for _, q := range quirkyIDs {
+ if strings.HasPrefix(public, q) {
+ quirks = true
+ break
+ }
+ }
+ }
+ // The following two public IDs only cause quirks mode if there is no system ID.
+ if len(n.Attr) == 1 && (strings.HasPrefix(public, "-//w3c//dtd html 4.01 frameset//") ||
+ strings.HasPrefix(public, "-//w3c//dtd html 4.01 transitional//")) {
+ quirks = true
+ }
+ }
+ if lastAttr := n.Attr[len(n.Attr)-1]; lastAttr.Key == "system" &&
+ strings.ToLower(lastAttr.Val) == "http://www.ibm.com/data/dtd/v11/ibmxhtml1-transitional.dtd" {
+ quirks = true
+ }
+ }
+
+ return n, quirks
+}
+
+// quirkyIDs is a list of public doctype identifiers that cause a document
+// to be interpreted in quirks mode. The identifiers should be in lower case.
+var quirkyIDs = []string{
+ "+//silmaril//dtd html pro v0r11 19970101//",
+ "-//advasoft ltd//dtd html 3.0 aswedit + extensions//",
+ "-//as//dtd html 3.0 aswedit + extensions//",
+ "-//ietf//dtd html 2.0 level 1//",
+ "-//ietf//dtd html 2.0 level 2//",
+ "-//ietf//dtd html 2.0 strict level 1//",
+ "-//ietf//dtd html 2.0 strict level 2//",
+ "-//ietf//dtd html 2.0 strict//",
+ "-//ietf//dtd html 2.0//",
+ "-//ietf//dtd html 2.1e//",
+ "-//ietf//dtd html 3.0//",
+ "-//ietf//dtd html 3.2 final//",
+ "-//ietf//dtd html 3.2//",
+ "-//ietf//dtd html 3//",
+ "-//ietf//dtd html level 0//",
+ "-//ietf//dtd html level 1//",
+ "-//ietf//dtd html level 2//",
+ "-//ietf//dtd html level 3//",
+ "-//ietf//dtd html strict level 0//",
+ "-//ietf//dtd html strict level 1//",
+ "-//ietf//dtd html strict level 2//",
+ "-//ietf//dtd html strict level 3//",
+ "-//ietf//dtd html strict//",
+ "-//ietf//dtd html//",
+ "-//metrius//dtd metrius presentational//",
+ "-//microsoft//dtd internet explorer 2.0 html strict//",
+ "-//microsoft//dtd internet explorer 2.0 html//",
+ "-//microsoft//dtd internet explorer 2.0 tables//",
+ "-//microsoft//dtd internet explorer 3.0 html strict//",
+ "-//microsoft//dtd internet explorer 3.0 html//",
+ "-//microsoft//dtd internet explorer 3.0 tables//",
+ "-//netscape comm. corp.//dtd html//",
+ "-//netscape comm. corp.//dtd strict html//",
+ "-//o'reilly and associates//dtd html 2.0//",
+ "-//o'reilly and associates//dtd html extended 1.0//",
+ "-//o'reilly and associates//dtd html extended relaxed 1.0//",
+ "-//softquad software//dtd hotmetal pro 6.0::19990601::extensions to html 4.0//",
+ "-//softquad//dtd hotmetal pro 4.0::19971010::extensions to html 4.0//",
+ "-//spyglass//dtd html 2.0 extended//",
+ "-//sq//dtd html 2.0 hotmetal + extensions//",
+ "-//sun microsystems corp.//dtd hotjava html//",
+ "-//sun microsystems corp.//dtd hotjava strict html//",
+ "-//w3c//dtd html 3 1995-03-24//",
+ "-//w3c//dtd html 3.2 draft//",
+ "-//w3c//dtd html 3.2 final//",
+ "-//w3c//dtd html 3.2//",
+ "-//w3c//dtd html 3.2s draft//",
+ "-//w3c//dtd html 4.0 frameset//",
+ "-//w3c//dtd html 4.0 transitional//",
+ "-//w3c//dtd html experimental 19960712//",
+ "-//w3c//dtd html experimental 970421//",
+ "-//w3c//dtd w3 html//",
+ "-//w3o//dtd w3 html 3.0//",
+ "-//webtechs//dtd mozilla html 2.0//",
+ "-//webtechs//dtd mozilla html//",
+}
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