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1 | // Copyright 2011 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 | "strings" | |
9 | ) | |
10 | ||
11 | // parseDoctype parses the data from a DoctypeToken into a name, | |
12 | // public identifier, and system identifier. It returns a Node whose Type | |
13 | // is DoctypeNode, whose Data is the name, and which has attributes | |
14 | // named "system" and "public" for the two identifiers if they were present. | |
15 | // quirks is whether the document should be parsed in "quirks mode". | |
16 | func parseDoctype(s string) (n *Node, quirks bool) { | |
17 | n = &Node{Type: DoctypeNode} | |
18 | ||
19 | // Find the name. | |
20 | space := strings.IndexAny(s, whitespace) | |
21 | if space == -1 { | |
22 | space = len(s) | |
23 | } | |
24 | n.Data = s[:space] | |
25 | // The comparison to "html" is case-sensitive. | |
26 | if n.Data != "html" { | |
27 | quirks = true | |
28 | } | |
29 | n.Data = strings.ToLower(n.Data) | |
30 | s = strings.TrimLeft(s[space:], whitespace) | |
31 | ||
32 | if len(s) < 6 { | |
33 | // It can't start with "PUBLIC" or "SYSTEM". | |
34 | // Ignore the rest of the string. | |
35 | return n, quirks || s != "" | |
36 | } | |
37 | ||
38 | key := strings.ToLower(s[:6]) | |
39 | s = s[6:] | |
40 | for key == "public" || key == "system" { | |
41 | s = strings.TrimLeft(s, whitespace) | |
42 | if s == "" { | |
43 | break | |
44 | } | |
45 | quote := s[0] | |
46 | if quote != '"' && quote != '\'' { | |
47 | break | |
48 | } | |
49 | s = s[1:] | |
50 | q := strings.IndexRune(s, rune(quote)) | |
51 | var id string | |
52 | if q == -1 { | |
53 | id = s | |
54 | s = "" | |
55 | } else { | |
56 | id = s[:q] | |
57 | s = s[q+1:] | |
58 | } | |
59 | n.Attr = append(n.Attr, Attribute{Key: key, Val: id}) | |
60 | if key == "public" { | |
61 | key = "system" | |
62 | } else { | |
63 | key = "" | |
64 | } | |
65 | } | |
66 | ||
67 | if key != "" || s != "" { | |
68 | quirks = true | |
69 | } else if len(n.Attr) > 0 { | |
70 | if n.Attr[0].Key == "public" { | |
71 | public := strings.ToLower(n.Attr[0].Val) | |
72 | switch public { | |
73 | case "-//w3o//dtd w3 html strict 3.0//en//", "-/w3d/dtd html 4.0 transitional/en", "html": | |
74 | quirks = true | |
75 | default: | |
76 | for _, q := range quirkyIDs { | |
77 | if strings.HasPrefix(public, q) { | |
78 | quirks = true | |
79 | break | |
80 | } | |
81 | } | |
82 | } | |
83 | // The following two public IDs only cause quirks mode if there is no system ID. | |
84 | if len(n.Attr) == 1 && (strings.HasPrefix(public, "-//w3c//dtd html 4.01 frameset//") || | |
85 | strings.HasPrefix(public, "-//w3c//dtd html 4.01 transitional//")) { | |
86 | quirks = true | |
87 | } | |
88 | } | |
89 | if lastAttr := n.Attr[len(n.Attr)-1]; lastAttr.Key == "system" && | |
90 | strings.ToLower(lastAttr.Val) == "http://www.ibm.com/data/dtd/v11/ibmxhtml1-transitional.dtd" { | |
91 | quirks = true | |
92 | } | |
93 | } | |
94 | ||
95 | return n, quirks | |
96 | } | |
97 | ||
98 | // quirkyIDs is a list of public doctype identifiers that cause a document | |
99 | // to be interpreted in quirks mode. The identifiers should be in lower case. | |
100 | var quirkyIDs = []string{ | |
101 | "+//silmaril//dtd html pro v0r11 19970101//", | |
102 | "-//advasoft ltd//dtd html 3.0 aswedit + extensions//", | |
103 | "-//as//dtd html 3.0 aswedit + extensions//", | |
104 | "-//ietf//dtd html 2.0 level 1//", | |
105 | "-//ietf//dtd html 2.0 level 2//", | |
106 | "-//ietf//dtd html 2.0 strict level 1//", | |
107 | "-//ietf//dtd html 2.0 strict level 2//", | |
108 | "-//ietf//dtd html 2.0 strict//", | |
109 | "-//ietf//dtd html 2.0//", | |
110 | "-//ietf//dtd html 2.1e//", | |
111 | "-//ietf//dtd html 3.0//", | |
112 | "-//ietf//dtd html 3.2 final//", | |
113 | "-//ietf//dtd html 3.2//", | |
114 | "-//ietf//dtd html 3//", | |
115 | "-//ietf//dtd html level 0//", | |
116 | "-//ietf//dtd html level 1//", | |
117 | "-//ietf//dtd html level 2//", | |
118 | "-//ietf//dtd html level 3//", | |
119 | "-//ietf//dtd html strict level 0//", | |
120 | "-//ietf//dtd html strict level 1//", | |
121 | "-//ietf//dtd html strict level 2//", | |
122 | "-//ietf//dtd html strict level 3//", | |
123 | "-//ietf//dtd html strict//", | |
124 | "-//ietf//dtd html//", | |
125 | "-//metrius//dtd metrius presentational//", | |
126 | "-//microsoft//dtd internet explorer 2.0 html strict//", | |
127 | "-//microsoft//dtd internet explorer 2.0 html//", | |
128 | "-//microsoft//dtd internet explorer 2.0 tables//", | |
129 | "-//microsoft//dtd internet explorer 3.0 html strict//", | |
130 | "-//microsoft//dtd internet explorer 3.0 html//", | |
131 | "-//microsoft//dtd internet explorer 3.0 tables//", | |
132 | "-//netscape comm. corp.//dtd html//", | |
133 | "-//netscape comm. corp.//dtd strict html//", | |
134 | "-//o'reilly and associates//dtd html 2.0//", | |
135 | "-//o'reilly and associates//dtd html extended 1.0//", | |
136 | "-//o'reilly and associates//dtd html extended relaxed 1.0//", | |
137 | "-//softquad software//dtd hotmetal pro 6.0::19990601::extensions to html 4.0//", | |
138 | "-//softquad//dtd hotmetal pro 4.0::19971010::extensions to html 4.0//", | |
139 | "-//spyglass//dtd html 2.0 extended//", | |
140 | "-//sq//dtd html 2.0 hotmetal + extensions//", | |
141 | "-//sun microsystems corp.//dtd hotjava html//", | |
142 | "-//sun microsystems corp.//dtd hotjava strict html//", | |
143 | "-//w3c//dtd html 3 1995-03-24//", | |
144 | "-//w3c//dtd html 3.2 draft//", | |
145 | "-//w3c//dtd html 3.2 final//", | |
146 | "-//w3c//dtd html 3.2//", | |
147 | "-//w3c//dtd html 3.2s draft//", | |
148 | "-//w3c//dtd html 4.0 frameset//", | |
149 | "-//w3c//dtd html 4.0 transitional//", | |
150 | "-//w3c//dtd html experimental 19960712//", | |
151 | "-//w3c//dtd html experimental 970421//", | |
152 | "-//w3c//dtd w3 html//", | |
153 | "-//w3o//dtd w3 html 3.0//", | |
154 | "-//webtechs//dtd mozilla html 2.0//", | |
155 | "-//webtechs//dtd mozilla html//", | |
156 | } |