File: ILTokenizer.cs

package info (click to toggle)
mono 4.6.2.7+dfsg-1
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 778,148 kB
  • ctags: 914,052
  • sloc: cs: 5,779,509; xml: 2,773,713; ansic: 432,645; sh: 14,749; makefile: 12,361; perl: 2,488; python: 1,434; cpp: 849; asm: 531; sql: 95; sed: 16; php: 1
file content (371 lines) | stat: -rw-r--r-- 17,415 bytes parent folder | download | duplicates (2)
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
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
// ILTokenizer.cs
// Author: Sergey Chaban (serge@wildwestsoftware.com)

using System;
using System.IO;
using System.Text;
using System.Collections;
using System.Globalization;

namespace Mono.ILASM {

        public delegate void NewTokenEvent (object sender, NewTokenEventArgs args);

        public class NewTokenEventArgs : EventArgs {

                public readonly ILToken Token;

                public NewTokenEventArgs (ILToken token)
                {
                        Token = token;
                }
        }

        /// <summary>
        /// </summary>
        public class ILTokenizer : ITokenStream {

                private static readonly string idchars = "_$@?.`";

                private static Hashtable keywords;
                private static Hashtable directives;

                private ILToken lastToken;
                private ILReader reader;
                private StringHelper strBuilder;
                private NumberHelper numBuilder;
                private bool in_byte_array;
                
                public event NewTokenEvent NewTokenEvent;

                static ILTokenizer()
                {
                        keywords = ILTables.Keywords;
                        directives = ILTables.Directives;
                }

                /// <summary>
                /// </summary>
                /// <param name="reader"></param>
                public ILTokenizer (StreamReader reader)
                {
                        this.reader = new ILReader (reader);
                        strBuilder = new StringHelper (this);
                        numBuilder = new NumberHelper (this);
                        lastToken = ILToken.Invalid.Clone () as ILToken;
                }

                public ILReader Reader {
                        get {
                                return reader;
                        }
                }

		public Location Location {
			get {
				return reader.Location;
			}
		}

                public bool InByteArray {
                        get { return in_byte_array; }
                        set { in_byte_array = value; }
                }

                public ILToken GetNextToken ()
                {
                        if (lastToken == ILToken.EOF) return ILToken.EOF;

                        int ch;
                        int next;
                        ILToken res = ILToken.EOF.Clone () as ILToken;

                        
                        while ((ch = reader.Read ()) != -1) {

                                // Comments
                                if (ch == '/') {
                                        next = reader.Peek ();
                                        if (next == '/') {
                                                // double-slash comment, skip to the end of the line.
                                                for (reader.Read ();
                                                        next != -1 && next != '\n';
                                                        next = reader.Read ());
                                                continue;
                                        } else if (next == '*') {
                                                reader.Read ();
                                                for (next = reader.Read (); next != -1; next = reader.Read ()) {
                                                        if (next == '*' && reader.Peek () == '/') {
                                                                reader.Read ();
                                                                goto end;
                                                        }
                                                }
                                        end:
                                                continue;
                                        }
                                }

                                // HEXBYTES are flagged by the parser otherwise it is
                                // impossible to figure them out
                                if (in_byte_array) {
                                        string hx = String.Empty;

                                        if (Char.IsWhiteSpace ((char) ch))
                                                continue;

                                        if (ch == ')') {
                                                res = ILToken.CloseParens;
                                                break;
                                        }

                                        if (!is_hex (ch))
                                                throw new ILTokenizingException (reader.Location, ((char) ch).ToString ());
                                        hx += (char) ch;
                                        if (is_hex (reader.Peek ()))
                                                hx += (char) reader.Read ();
                                        else if (!Char.IsWhiteSpace ((char) reader.Peek ()) && reader.Peek () != ')')
                                                throw new ILTokenizingException (reader.Location,
                                                                ((char) reader.Peek ()).ToString ());
                                        res.token = Token.HEXBYTE;
                                        res.val = Byte.Parse (hx, NumberStyles.HexNumber);

                                        while (Char.IsWhiteSpace ((char) reader.Peek ()))
                                                reader.Read ();
                                        break;
                                }
                                
                                // Ellipsis
                                if (ch == '.' && reader.Peek () == '.') {
                                        reader.MarkLocation ();
                                        int ch2 = reader.Read ();
                                        if (reader.Peek () == '.') {
                                                res = ILToken.Ellipsis;
                                                reader.Read ();
                                                break;
                                        }
                                        reader.Unread (ch2);
                                        reader.RestoreLocation ();
                                }

                                if (ch == '.' || ch == '#') {
                                        next = reader.Peek ();
                                        if (ch == '.' && Char.IsDigit((char) next)) {
                                                numBuilder.Start (ch);
                                                reader.Unread (ch);
                                                numBuilder.Build ();
                                                if (numBuilder.ResultToken != ILToken.Invalid) {
                                                        res.CopyFrom (numBuilder.ResultToken);
                                                        break;
                                                }
                                        } else {
                                                if (strBuilder.Start (next) && strBuilder.TokenId == Token.ID) {
                                                        reader.MarkLocation ();
                                                        string dirBody = strBuilder.Build ();
                                                        string dir = new string ((char) ch, 1) + dirBody;
                                                        if (IsDirective (dir)) {
                                                                res = ILTables.Directives [dir] as ILToken;
                                                        } else {
                                                                reader.Unread (dirBody.ToCharArray ());
                                                                reader.RestoreLocation ();
                                                                res = ILToken.Dot;
                                                        }
                                                } else {
                                                        res = ILToken.Dot;
                                                }
                                                break;
                                        }
                                }

                                // Numbers && Hexbytes
                                if (numBuilder.Start (ch)) {
                                        if ((ch == '-') && !(Char.IsDigit ((char) reader.Peek ()))) {
                                                res = ILToken.Dash;
                                                break;
                                        } else {
                                                reader.Unread (ch);
                                                numBuilder.Build ();
                                                if (numBuilder.ResultToken != ILToken.Invalid) {
                                                        res.CopyFrom (numBuilder.ResultToken);
                                                        break;
                                                }
                                        }
                                }

                                // Punctuation
                                ILToken punct = ILToken.GetPunctuation (ch);
                                if (punct != null) {
                                        if (punct == ILToken.Colon && reader.Peek () == ':') {
                                                reader.Read ();
                                                res = ILToken.DoubleColon;
                                        } else {
                                                res = punct;
                                        }
                                        break;
                                }

                                // ID | QSTRING | SQSTRING | INSTR_* | KEYWORD
                                if (strBuilder.Start (ch)) {
                                        reader.Unread (ch);
                                        string val = strBuilder.Build ();
                                        if (strBuilder.TokenId == Token.ID) {
                                                ILToken opcode;
                                                next = reader.Peek ();
                                                if (next == '.') {
                                                        reader.MarkLocation ();
                                                        reader.Read ();
                                                        next = reader.Peek ();
                                                        if (IsIdChar ((char) next)) {
                                                                string opTail = BuildId ();
                                                                string full_str = String.Format ("{0}.{1}", val, opTail);
                                                                opcode = InstrTable.GetToken (full_str);

                                                                if (opcode == null) {
                                                                        if (strBuilder.TokenId != Token.ID) {
                                                                                reader.Unread (opTail.ToCharArray ());
										reader.Unread ('.');
                                                                                reader.RestoreLocation ();
                                                                                res.val = val;
                                                                        } else {
                                                                                res.token = Token.COMP_NAME;
                                                                                res.val = full_str;
                                                                        }
                                                                        break;
                                                                } else {
                                                                        res = opcode;
                                                                        break;
                                                                }

                                                        } else if (Char.IsWhiteSpace ((char) next)) {
								// Handle 'tail.' and 'unaligned.'
								opcode = InstrTable.GetToken (val + ".");
								if (opcode != null) {
									res = opcode;
									break;
								}
								// Let the parser handle the dot
								reader.Unread ('.');
                                                        }
                                                }
                                                opcode = InstrTable.GetToken (val);
                                                if (opcode != null) {
                                                        res = opcode;
                                                        break;
                                                }
                                                if (IsKeyword (val)) {
                                                        res = ILTables.Keywords [val] as ILToken;
                                                        break;
                                                }
                                        }

                                        res.token = strBuilder.TokenId;
                                        res.val = val;
                                        break;
                                }
                        }

                        OnNewToken (res);
                        lastToken.CopyFrom (res);
                        return res;
                }


                /// <summary>
                /// </summary>
                public ILToken NextToken {
                        get {
                                return GetNextToken ();
                        }
                }


                /// <summary>
                /// </summary>
                public ILToken LastToken {
                        get {
                                return lastToken;
                        }
                }

                bool is_hex (int e)
                {
                        return (e >= '0' && e <= '9') || (e >= 'A' && e <= 'F') || (e >= 'a' && e <= 'f');
                }

                private static bool IsIdStartChar (char ch)
                {
                        return (Char.IsLetter (ch) || (idchars.IndexOf (ch) != -1));
                }


                private static bool IsIdChar (char ch)
                {
                        return (Char.IsLetterOrDigit (ch) || (idchars.IndexOf (ch) != -1));
                }

                /// <summary>
                /// </summary>
                /// <param name="name"></param>
                /// <returns></returns>
                public static bool IsOpcode (string name)
                {
                        return InstrTable.IsInstr (name);
                }


                /// <summary>
                /// </summary>
                /// <param name="name"></param>
                /// <returns></returns>
                public static bool IsDirective (string name)
                {
                        char ch = name [0];
                        bool res = (ch == '.' || ch == '#');

                        if (res) {
                                res = directives.Contains (name);
                        }

                        return res;
                }

                private string BuildId ()
                {
                        StringBuilder idsb = new StringBuilder ();
                        int ch, last;

                        last = -1;
                        while ((ch = reader.Read ()) != -1) {
                                if (IsIdChar ((char) ch) || ch == '.') {
                                        idsb.Append ((char) ch);
                                } else {
                                        reader.Unread (ch);
                                        // Never end an id on a DOT
                                        if (last == '.') {
                                                reader.Unread (last);
                                                idsb.Length -= 1;
                                        }        
                                        break;
                                }
                                last = ch;
                        }

                        return idsb.ToString ();
                }

                /// <summary>
                /// </summary>
                /// <param name="name"></param>
                /// <returns></returns>
                public static bool IsKeyword (string name)
                {
                        return keywords.Contains (name);
                }

                private void OnNewToken (ILToken token)
                {
                        if (NewTokenEvent != null)
                                NewTokenEvent (this, new NewTokenEventArgs (token));
                }

        }
}