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
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
|
// Copyright (c) 2013-2021 Bruyère Jean-Philippe <jp_bruyere@hotmail.com>
//
// This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
using System;
using Crow.Text;
using System.Collections.Generic;
using System.Diagnostics;
namespace Crow
{
public class XmlSource {
public Token[] Tokens;
public readonly string Source;
SyntaxNode RootNode;
public XmlSource (string _source) {
Source = _source;
Tokenizer tokenizer = new Tokenizer();
Tokens = tokenizer.Tokenize (Source);
SyntaxAnalyser syntaxAnalyser = new SyntaxAnalyser (this);
Stopwatch sw = Stopwatch.StartNew ();
syntaxAnalyser.Process ();
sw.Stop();
/*foreach (Token t in Tokens)
Console.WriteLine ($"{t,-40} {Source.AsSpan(t.Start, t.Length).ToString()}");
syntaxAnalyser.Root.Dump();*/
Console.WriteLine ($"Syntax Analysis done in {sw.ElapsedMilliseconds}(ms) {sw.ElapsedTicks}(ticks)");
foreach (SyntaxException ex in syntaxAnalyser.Exceptions)
Console.WriteLine ($"{ex}");
RootNode = syntaxAnalyser.Root;
}
public Token FindTokenIncludingPosition (int pos) {
if (Tokens == null || Tokens.Length == 0)
return default;
int idx = Array.BinarySearch (Tokens, 0, Tokens.Length, new Token () {Start = pos});
return idx == 0 ? Tokens[0] : idx < 0 ? Tokens[~idx - 1] : Tokens[idx - 1];
}
public SyntaxNode FindNodeIncludingPosition (int pos) {
if (RootNode == null)
return null;
if (!RootNode.Contains (pos))
return null;
return RootNode.FindNodeIncludingPosition (pos);
}
public T FindNodeIncludingPosition<T> (int pos) {
if (RootNode == null)
return default;
if (!RootNode.Contains (pos))
return default;
return RootNode.FindNodeIncludingPosition<T> (pos);
}
public class TokenizerException : Exception {
public readonly int Position;
public TokenizerException(string message, int position, Exception innerException = null)
: base (message, innerException) {
Position = position;
}
}
class Tokenizer {
enum States
{
Init,//first statement of prolog, xmldecl should only apear in this state
prolog,//misc before doctypedecl
ProcessingInstrucitons,
DTD,
DTDObject,//doctype finished
Xml,
StartTag,//inside start tag
Content,//after start tag with no closing slash
EndTag
}
States curState = States.Init;
List<Token> Toks = new List<Token>(100);
public Tokenizer () {}
void skipWhiteSpaces (ref SpanCharReader reader) {
while(!reader.EndOfSpan) {
switch (reader.Peak) {
case '\x85':
case '\x2028':
case '\xA':
reader.Read();
addTok (ref reader, TokenType.LineBreak);
break;
case '\xD':
reader.Read();
if (reader.IsNextCharIn ('\xA', '\x85'))
reader.Read();
addTok (ref reader, TokenType.LineBreak);
break;
case '\x20':
case '\x9':
char c = reader.Read();
while (reader.TryPeak (c))
reader.Read();
addTok (ref reader, c == '\x20' ? TokenType.WhiteSpace : TokenType.Tabulation);
break;
default:
return;
}
}
}
bool readName (ref SpanCharReader reader) {
if (reader.EndOfSpan)
return false;
char c = reader.Peak;
if (char.IsLetter(c) || c == '_' || c == ':') {
reader.Advance ();
while (reader.TryPeak (ref c)) {
if (!(char.IsLetterOrDigit(c) || c == '.' || c == '-' || c == '\xB7'))
return true;
reader.Advance ();
}
return true;
}
return false;
}
int startOfTok;
void addTok (ref SpanCharReader reader, TokenType tokType) {
if (reader.CurrentPosition == startOfTok)
return;
Toks.Add (new Token(tokType, startOfTok, reader.CurrentPosition));
startOfTok = reader.CurrentPosition;
}
public Token[] Tokenize (string source) {
SpanCharReader reader = new SpanCharReader(source);
startOfTok = 0;
int curObjectLevel = 0;
curState = States.Init;
while(!reader.EndOfSpan) {
skipWhiteSpaces (ref reader);
if (reader.EndOfSpan)
break;
switch (reader.Peak) {
case '<':
reader.Advance ();
if (reader.TryPeak ('?')) {
reader.Advance ();
addTok (ref reader, TokenType.PI_Start);
readName (ref reader);
addTok (ref reader, TokenType.PI_Target);
curState = States.ProcessingInstrucitons;
} else if (reader.TryPeak ('!')) {
reader.Advance ();
if (reader.TryPeak ("--")) {
reader.Advance (2);
addTok (ref reader, TokenType.BlockCommentStart);
if (reader.TryReadUntil ("-->")) {
addTok (ref reader, TokenType.BlockComment);
reader.Advance (3);
addTok (ref reader, TokenType.BlockCommentEnd);
} else if (reader.TryPeak ("-->")) {
reader.Advance (3);
addTok (ref reader, TokenType.BlockCommentEnd);
}
} else {
addTok (ref reader, TokenType.DTDObjectOpen);
if (readName (ref reader)) {
addTok (ref reader, TokenType.Keyword);
curState = States.DTDObject;
}
}
} else if (reader.TryPeak('/')) {
reader.Advance ();
addTok (ref reader, TokenType.EndElementOpen);
if (readName (ref reader)) {
addTok (ref reader, TokenType.ElementName);
if (reader.TryPeak('>')) {
reader.Advance ();
addTok (ref reader, TokenType.ClosingSign);
if (--curObjectLevel > 0)
curState = States.Content;
else
curState = States.Xml;
}
}
}else{
addTok (ref reader, TokenType.ElementOpen);
if (readName (ref reader)) {
addTok (ref reader, TokenType.ElementName);
curState = States.StartTag;
}
}
break;
case '?':
reader.Advance ();
if (reader.TryPeak ('>')){
reader.Advance ();
addTok (ref reader, TokenType.PI_End);
}else
addTok (ref reader, TokenType.Unknown);
curState = States.prolog;
break;
case '\'':
case '"':
char q = reader.Read();
addTok (ref reader, TokenType.AttributeValueOpen);
if (reader.TryReadUntil (q)) {
addTok (ref reader, TokenType.AttributeValue);
reader.Advance ();
addTok (ref reader, TokenType.AttributeValueClose);
} else
addTok (ref reader, TokenType.AttributeValue);
break;
case '=':
reader.Advance();
addTok (ref reader, TokenType.EqualSign);
break;
case '>':
reader.Advance();
addTok (ref reader, TokenType.ClosingSign);
curObjectLevel++;
curState = States.Content;
break;
case '/':
reader.Advance();
if (reader.TryRead ('>')) {
addTok (ref reader, TokenType.EmptyElementClosing);
if (--curObjectLevel > 0)
curState = States.Content;
else
curState = States.Xml;
}else
addTok (ref reader, TokenType.Unknown);
break;
default:
if (curState == States.StartTag || curState == States.ProcessingInstrucitons) {
if (readName(ref reader))
addTok (ref reader, TokenType.AttributeName);
else if (reader.TryAdvance())
addTok (ref reader, TokenType.Unknown);
} else {
reader.TryReadUntil ('<');
addTok (ref reader, TokenType.Content);
}
break;
}
}
return Toks.ToArray();
}
}
}
}
|
