blob: f11ee6538f680449e5a6b79e4ecf2c09f66dd1c7 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Collections.Generic;
using System.Diagnostics;
using System.Web.Razor.Parser;
using System.Web.Razor.Parser.SyntaxTree;
using System.Web.Razor.Text;
using System.Web.Razor.Tokenizer.Symbols;
namespace System.Web.Razor.Tokenizer
{
// Tokenizer _loosely_ based on http://dev.w3.org/html5/spec/Overview.html#tokenization
public class HtmlTokenizer : Tokenizer<HtmlSymbol, HtmlSymbolType>
{
private const char TransitionChar = '@';
public HtmlTokenizer(ITextDocument source)
: base(source)
{
CurrentState = Data;
}
protected override State StartState
{
get { return Data; }
}
public override HtmlSymbolType RazorCommentType
{
get { return HtmlSymbolType.RazorComment; }
}
public override HtmlSymbolType RazorCommentTransitionType
{
get { return HtmlSymbolType.RazorCommentTransition; }
}
public override HtmlSymbolType RazorCommentStarType
{
get { return HtmlSymbolType.RazorCommentStar; }
}
internal static IEnumerable<HtmlSymbol> Tokenize(string content)
{
using (SeekableTextReader reader = new SeekableTextReader(content))
{
HtmlTokenizer tok = new HtmlTokenizer(reader);
HtmlSymbol sym;
while ((sym = tok.NextSymbol()) != null)
{
yield return sym;
}
}
}
protected override HtmlSymbol CreateSymbol(SourceLocation start, string content, HtmlSymbolType type, IEnumerable<RazorError> errors)
{
return new HtmlSymbol(start, content, type, errors);
}
// http://dev.w3.org/html5/spec/Overview.html#data-state
private StateResult Data()
{
if (ParserHelpers.IsWhitespace(CurrentCharacter))
{
return Stay(Whitespace());
}
else if (ParserHelpers.IsNewLine(CurrentCharacter))
{
return Stay(Newline());
}
else if (CurrentCharacter == '@')
{
TakeCurrent();
if (CurrentCharacter == '*')
{
return Transition(EndSymbol(HtmlSymbolType.RazorCommentTransition), AfterRazorCommentTransition);
}
else if (CurrentCharacter == '@')
{
// Could be escaped comment transition
return Transition(EndSymbol(HtmlSymbolType.Transition), () =>
{
TakeCurrent();
return Transition(EndSymbol(HtmlSymbolType.Transition), Data);
});
}
return Stay(EndSymbol(HtmlSymbolType.Transition));
}
else if (AtSymbol())
{
return Stay(Symbol());
}
else
{
return Transition(Text);
}
}
private StateResult Text()
{
char prev = '\0';
while (!EndOfFile && !ParserHelpers.IsWhitespaceOrNewLine(CurrentCharacter) && !AtSymbol())
{
prev = CurrentCharacter;
TakeCurrent();
}
if (CurrentCharacter == '@')
{
char next = Peek();
if (ParserHelpers.IsLetterOrDecimalDigit(prev) && ParserHelpers.IsLetterOrDecimalDigit(next))
{
TakeCurrent(); // Take the "@"
return Stay(); // Stay in the Text state
}
}
// Output the Text token and return to the Data state to tokenize the next character (if there is one)
return Transition(EndSymbol(HtmlSymbolType.Text), Data);
}
private HtmlSymbol Symbol()
{
Debug.Assert(AtSymbol());
char sym = CurrentCharacter;
TakeCurrent();
switch (sym)
{
case '<':
return EndSymbol(HtmlSymbolType.OpenAngle);
case '!':
return EndSymbol(HtmlSymbolType.Bang);
case '/':
return EndSymbol(HtmlSymbolType.Solidus);
case '?':
return EndSymbol(HtmlSymbolType.QuestionMark);
case '[':
return EndSymbol(HtmlSymbolType.LeftBracket);
case '>':
return EndSymbol(HtmlSymbolType.CloseAngle);
case ']':
return EndSymbol(HtmlSymbolType.RightBracket);
case '=':
return EndSymbol(HtmlSymbolType.Equals);
case '"':
return EndSymbol(HtmlSymbolType.DoubleQuote);
case '\'':
return EndSymbol(HtmlSymbolType.SingleQuote);
case '-':
Debug.Assert(CurrentCharacter == '-');
TakeCurrent();
return EndSymbol(HtmlSymbolType.DoubleHyphen);
default:
Debug.Fail("Unexpected symbol!");
return EndSymbol(HtmlSymbolType.Unknown);
}
}
private HtmlSymbol Whitespace()
{
while (ParserHelpers.IsWhitespace(CurrentCharacter))
{
TakeCurrent();
}
return EndSymbol(HtmlSymbolType.WhiteSpace);
}
private HtmlSymbol Newline()
{
Debug.Assert(ParserHelpers.IsNewLine(CurrentCharacter));
// CSharp Spec §2.3.1
bool checkTwoCharNewline = CurrentCharacter == '\r';
TakeCurrent();
if (checkTwoCharNewline && CurrentCharacter == '\n')
{
TakeCurrent();
}
return EndSymbol(HtmlSymbolType.NewLine);
}
private bool AtSymbol()
{
return CurrentCharacter == '<' ||
CurrentCharacter == '<' ||
CurrentCharacter == '!' ||
CurrentCharacter == '/' ||
CurrentCharacter == '?' ||
CurrentCharacter == '[' ||
CurrentCharacter == '>' ||
CurrentCharacter == ']' ||
CurrentCharacter == '=' ||
CurrentCharacter == '"' ||
CurrentCharacter == '\'' ||
CurrentCharacter == '@' ||
(CurrentCharacter == '-' && Peek() == '-');
}
}
}
|
