| 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
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793 |
1
1
1
1
526
526
526
1
1
1
1
667
667
41
526
15356
1710
12214
1072
360
114
526
1460
959
959
959
939
132
132
501
501
501
501
481
526
6705
3015
3015
3015
3015
3015
1847
250
1597
3
1594
1594
1168
7
7
4
1161
951
662
289
5
284
111
173
173
210
55
3015
3015
3690
103
103
103
103
3587
12
12
12
12
1
1
1
1
3575
3
3
3
3
3572
1773
1773
1773
1773
1773
1773
213
1560
1560
1799
528
528
528
528
528
528
147
381
381
526
1784
698
660
660
351
23
23
23
23
23
23
23
23
23
23
330
1
329
329
329
328
315
1086
1079
1079
1079
41
1038
1038
23
526
19885
19885
8386
8386
8223
11499
526
24946
24946
24946
32980
32980
24946
17837
17837
17837
2813
2813
2735
15024
526
9560
5343
5343
5343
5343
526
598
60
60
60
60
60
60
60
60
526
1052
167
40
40
40
40
40
40
40
526
135
30
30
30
30
30
30
526
851
851
851
630
630
630
630
630
2
628
630
167
463
221
851
851
526
1514
753
1514
1514
1
17639
17639
17639
17023
1
18922
41070
1
60624
60624
60486
1
15987
1
23732
1
7261
7261
7101
7101
7101
2523
160
21
139
1
56
56
1
1
6
6
1
5484
5422
1
469
469
469
469
469
469
1
87
87
1
284
280
187
93
284
284
284
284
284
1
144
144
144
144
1
1465
1465
1465
1465
1465
1
5511
5511
1
6
52
47
52
1
469
469
469
469
1
5511
6677
6677
6677
81
81
81
81
6596
6596
6596
6596
5836
6677
1
28435
37843
37813
1
218870
180424
1
1740
1740
1
2768
5180
1
5890
5890
5890
1
7
7
1
370
1
2641
947
947
947
130
130
947
278
278
278
278
151
2490
1
15958
15958
1
11408
11408
23
23
23
11385
4162
4162
4162
4162
4152
7223
7223
7223
1
825
825
795
795
795
795
30
10
20
20
1
367
367
367
1
1
208
208
314
314
111
111
203
203
208
317
208
314
203
193
208
208
30714
31
31
30683
177
30506
30506
9186
9186
4225
26281
26281
26281
26281
1
47289
47289
47289
61747
61747
47289
7478
7478
7478
7478
2050
45239
45239
759
1
60447
8401
8401
275
1
12047
12047
12047
9409
9409
9409
9409
9409
12047
12047
1
86403
86403
32799
53604
1
7
7
1
1
2
1
2893
2883
2883
2883
2883
2883
2883
2883
2883
2883
2883
1
108
108
108
108
| /*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
var esprima = require("esprima");
var Tapable = require("tapable");
var BasicEvaluatedExpression = require("./BasicEvaluatedExpression");
function Parser(options) {
Tapable.call(this);
this.options = options;
this.initializeEvaluating();
}
module.exports = Parser;
// Syntax: https://developer.mozilla.org/en/SpiderMonkey/Parser_API
Parser.prototype = Object.create(Tapable.prototype);
Parser.prototype.initializeEvaluating = function() {
function joinRanges(startRange, endRange) {
Iif(!endRange) return startRange;
if(!startRange) return endRange;
return [startRange[0], endRange[1]];
}
this.plugin("evaluate Literal", function(expr) {
switch(typeof expr.value) {
case "number":
return new BasicEvaluatedExpression().setNumber(expr.value).setRange(expr.range);
case "string":
return new BasicEvaluatedExpression().setString(expr.value).setRange(expr.range);
case "boolean":
return new BasicEvaluatedExpression().setBoolean(expr.value).setRange(expr.range);
}
if(expr.value instanceof RegExp)
return new BasicEvaluatedExpression().setRegExp(expr.value).setRange(expr.range);
});
this.plugin("evaluate LogicalExpression", function(expr) {
if(expr.operator === "&&") {
var left = this.evaluateExpression(expr.left);
var leftAsBool = left && left.asBool();
if(leftAsBool === false) return left.setRange(expr.range);
if(leftAsBool !== true) return;
var right = this.evaluateExpression(expr.right);
return right.setRange(expr.range);
} else Eif(expr.operator === "||") {
var left = this.evaluateExpression(expr.left);
var leftAsBool = left && left.asBool();
if(leftAsBool === true) return left.setRange(expr.range);
Eif(leftAsBool !== false) return;
var right = this.evaluateExpression(expr.right);
return right.setRange(expr.range);
}
});
this.plugin("evaluate BinaryExpression", function(expr) {
if(expr.operator === "+") {
var left = this.evaluateExpression(expr.left);
var right = this.evaluateExpression(expr.right);
Iif(!left || !right) return;
var res = new BasicEvaluatedExpression()
if(left.isString()) {
if(right.isString()) {
res.setString(left.string + right.string);
} else if(right.isNumber()) {
res.setString(left.string + right.number);
} else Iif(right.isWrapped() && right.prefix.isString()) {
res.setWrapped(
new BasicEvaluatedExpression()
.setString(left.string + right.prefix.string)
.setRange(joinRanges(left.range, right.prefix.range)),
right.postfix);
} else {
res.setWrapped(left, new BasicEvaluatedExpression().setString(""))
}
} else if(left.isNumber()) {
Iif(right.isString()) {
res.setString(left.number + right.string);
} else if(right.isNumber()) {
res.setNumber(left.number + right.number);
}
} else if(left.isWrapped()) {
if(left.postfix.isString() && right.isString()) {
res.setWrapped(left.prefix,
new BasicEvaluatedExpression()
.setString(left.postfix.string + right.string)
.setRange(joinRanges(left.postfix.range, right.range))
);
} else if(left.postfix.isString() && right.isNumber()) {
res.setWrapped(left.prefix,
new BasicEvaluatedExpression()
.setString(left.postfix.string + right.number)
.setRange(joinRanges(left.postfix.range, right.range))
);
} else if(right.isString()) {
res.setWrapped(left.prefix, right);
} else Iif(right.isNumber()) {
res.setWrapped(left.prefix,
new BasicEvaluatedExpression()
.setString(right.number + "")
.setRange(right.range));
} else {
res.setWrapped(left.prefix, new BasicEvaluatedExpression());
}
} else {
if(right.isString()) {
res.setWrapped(new BasicEvaluatedExpression().setString(""), right);
}
}
res.setRange(expr.range);
return res;
} else if(expr.operator === "-") {
var left = this.evaluateExpression(expr.left);
var right = this.evaluateExpression(expr.right);
Iif(!left || !right) return;
Eif(!left.isNumber() || !right.isNumber()) return;
var res = new BasicEvaluatedExpression();
res.setNumber(left.number - right.number);
res.setRange(expr.range);
return res;
} else if(expr.operator === "*") {
var left = this.evaluateExpression(expr.left);
var right = this.evaluateExpression(expr.right);
Iif(!left || !right) return;
if(!left.isNumber() || !right.isNumber()) return;
var res = new BasicEvaluatedExpression();
res.setNumber(left.number * right.number);
res.setRange(expr.range);
return res;
} else if(expr.operator === "/") {
var left = this.evaluateExpression(expr.left);
var right = this.evaluateExpression(expr.right);
Iif(!left || !right) return;
Eif(!left.isNumber() || !right.isNumber()) return;
var res = new BasicEvaluatedExpression();
res.setNumber(left.number / right.number);
res.setRange(expr.range);
return res;
} else if(expr.operator === "==" || expr.operator === "===") {
var left = this.evaluateExpression(expr.left);
var right = this.evaluateExpression(expr.right);
Iif(!left || !right) return;
var res = new BasicEvaluatedExpression();
res.setRange(expr.range);
if(left.isString() && right.isString()) {
return res.setBoolean(left.string === right.string);
} else Iif(left.isNumber() && right.isNumber()) {
return res.setBoolean(left.number === right.number);
} else Iif(left.isBoolean() && right.isBoolean()) {
return res.setBoolean(left.bool === right.bool);
}
} else if(expr.operator === "!=" || expr.operator === "!==") {
var left = this.evaluateExpression(expr.left);
var right = this.evaluateExpression(expr.right);
Iif(!left || !right) return;
var res = new BasicEvaluatedExpression();
res.setRange(expr.range);
if(left.isString() && right.isString()) {
return res.setBoolean(left.string !== right.string);
} else Iif(left.isNumber() && right.isNumber()) {
return res.setBoolean(left.number !== right.number);
} else Iif(left.isBoolean() && right.isBoolean()) {
return res.setBoolean(left.bool !== right.bool);
}
}
});
this.plugin("evaluate UnaryExpression", function(expr) {
if(expr.operator === "typeof") {
if(expr.argument.type === "Identifier") {
var res = this.applyPluginsBailResult("evaluate typeof " + expr.argument.name, expr);
if(res !== undefined) return res;
}
if(expr.argument.type === "MemberExpression") {
var expression = expr.argument;
var exprName = [];
while(expression.type === "MemberExpression" && expression.property.type === "Identifier") {
exprName.unshift(expression.property.name);
expression = expression.object;
}
Eif(expression.type === "Identifier" && this.scope.definitions.indexOf(expression.name) === -1) {
exprName.unshift(this.scope.renames["$"+expression.name] || expression.name);
exprName = exprName.join(".");
var res = this.applyPluginsBailResult("evaluate typeof " + exprName, expr);
if(res !== undefined) return res;
}
}
if(expr.argument.type === "FunctionExpression") {
return new BasicEvaluatedExpression().setString("function").setRange(expr.range);
}
var arg = this.evaluateExpression(expr.argument);
Iif(arg.isString() || arg.isWrapped()) return new BasicEvaluatedExpression().setString("string").setRange(expr.range);
else if(arg.isNumber()) return new BasicEvaluatedExpression().setString("number").setRange(expr.range);
else if(arg.isBoolean()) return new BasicEvaluatedExpression().setString("boolean").setRange(expr.range);
else Iif(arg.isArray() || arg.isConstArray() || arg.isRegExp()) return new BasicEvaluatedExpression().setString("object").setRange(expr.range);
} else if(expr.operator === "!") {
var argument = this.evaluateExpression(expr.argument);
Iif(!argument) return;
if(argument.isBoolean()) {
return new BasicEvaluatedExpression().setBoolean(!argument.bool).setRange(expr.range);
} else Iif(argument.isString()) {
return new BasicEvaluatedExpression().setBoolean(!argument.string).setRange(expr.range);
} else if(argument.isNumber()) {
return new BasicEvaluatedExpression().setBoolean(!argument.number).setRange(expr.range);
}
}
});
this.plugin("evaluate Identifier", function(expr) {
var name = this.scope.renames["$"+expr.name] || expr.name;
if(this.scope.definitions.indexOf(expr.name) === -1) {
var result = this.applyPluginsBailResult("evaluate Identifier " + name, expr);
if(result) return result;
return new BasicEvaluatedExpression().setIdentifier(name).setRange(expr.range);
} else {
return this.applyPluginsBailResult("evaluate defined Identifier " + name, expr);
}
});
this.plugin("evaluate MemberExpression", function(expression) {
var expr = expression;
var exprName = [];
while(expr.type === "MemberExpression" && expr.property.type === "Identifier") {
exprName.unshift(expr.property.name);
expr = expr.object;
}
if(expr.type === "Identifier") {
exprName.unshift(this.scope.renames["$"+expr.name] || expr.name);
exprName = exprName.join(".");
if(this.scope.definitions.indexOf(expr.name) === -1) {
var result = this.applyPluginsBailResult("evaluate Identifier " + exprName, expression);
if(result) return result;
return new BasicEvaluatedExpression().setIdentifier(exprName).setRange(expression.range);
} else {
return this.applyPluginsBailResult("evaluate defined Identifier " + exprName, expression);
}
}
});
this.plugin("evaluate CallExpression", function(expr) {
if(expr.callee.type !== "MemberExpression") return;
Iif(expr.callee.property.type !== "Identifier") return;
var param = this.evaluateExpression(expr.callee.object);
Iif(!param) return;
return this.applyPluginsBailResult("evaluate CallExpression ." + expr.callee.property.name, expr, param);
});
this.plugin("evaluate CallExpression .replace", function(expr, param) {
if(!param.isString()) return;
Iif(expr.arguments.length !== 2) return;
var arg1 = this.evaluateExpression(expr.arguments[0]);
var arg2 = this.evaluateExpression(expr.arguments[1]);
Iif(!arg1.isString() && !arg1.isRegExp()) return;
arg1 = arg1.regExp || arg1.string;
Iif(!arg2.isString()) return;
arg2 = arg2.string;
return new BasicEvaluatedExpression().setString(param.string.replace(arg1, arg2)).setRange(expr.range);
});
["substr", "substring"].forEach(function(fn) {
this.plugin("evaluate CallExpression ." + fn, function(expr, param) {
if(!param.isString()) return;
var result, str = param.string;
switch(expr.arguments.length) {
case 1:
var arg1 = this.evaluateExpression(expr.arguments[0]);
Iif(!arg1.isNumber()) return;
result = str[fn](arg1.number);
break;
case 2:
var arg1 = this.evaluateExpression(expr.arguments[0]);
var arg2 = this.evaluateExpression(expr.arguments[0]);
if(!arg1.isNumber()) return;
if(!arg2.isNumber()) return;
result = str[fn](arg1.number, arg2.number);
break;
default:
return;
}
return new BasicEvaluatedExpression().setString(result).setRange(expr.range);
});
}, this);
this.plugin("evaluate CallExpression .split", function(expr, param) {
if(!param.isString()) return;
Iif(expr.arguments.length !== 1) return;
var result;
var arg = this.evaluateExpression(expr.arguments[0]);
Eif(arg.isString()) {
result = param.string.split(arg.string);
} else if(arg.isRegExp()) {
result = param.string.split(arg.regExp);
} else return;
return new BasicEvaluatedExpression().setArray(result).setRange(expr.range);
});
this.plugin("evaluate ConditionalExpression", function(expr) {
var condition = this.evaluateExpression(expr.test);
var conditionValue = condition.asBool();
if(conditionValue === undefined) {
var consequent = this.evaluateExpression(expr.consequent);
var alternate = this.evaluateExpression(expr.alternate);
Iif(!consequent || !alternate) return;
var res = new BasicEvaluatedExpression();
if(consequent.isConditional())
res.setOptions(consequent.options);
else
res.setOptions([consequent]);
if(alternate.isConditional())
res.addOptions(alternate.options);
else
res.addOptions([alternate]);
} else {
var res = this.evaluateExpression(conditionValue ? expr.consequent : expr.alternate);
}
res.setRange(expr.range);
return res;
});
this.plugin("evaluate ArrayExpression", function(expr) {
var items = expr.elements.map(function(element) {
return this.evaluateExpression(element);
}, this);
Iif(items.filter(function(i) { return !i; }).length > 0) return;
return new BasicEvaluatedExpression().setItems(items).setRange(expr.range);
});
};
Parser.prototype.getRenameIdentifier = function getRenameIdentifier(expr) {
var result = this.evaluateExpression(expr);
Iif(!result) return;
if(result.isIdentifier()) return result.identifier;
return;
};
Parser.prototype.walkStatements = function walkStatements(statements) {
statements.forEach(function(statement) {
this.walkStatement(statement);
}, this);
};
Parser.prototype.walkStatement = function walkStatement(statement) {
Iif(this.applyPluginsBailResult("statement", statement) !== undefined) return;
if(this["walk" + statement.type])
this["walk" + statement.type](statement);
};
// Real Statements
Parser.prototype.walkBlockStatement = function walkBlockStatement(statement) {
this.walkStatements(statement.body);
};
Parser.prototype.walkExpressionStatement = function walkExpressionStatement(statement) {
this.walkExpression(statement.expression);
};
Parser.prototype.walkIfStatement = function walkIfStatement(statement) {
var result = this.applyPluginsBailResult("statement if", statement);
if(result === undefined) {
this.walkExpression(statement.test);
this.walkStatement(statement.consequent);
if(statement.alternate)
this.walkStatement(statement.alternate);
} else {
if(result)
this.walkStatement(statement.consequent);
else Iif(statement.alternate)
this.walkStatement(statement.alternate);
}
};
Parser.prototype.walkLabeledStatement = function walkLabeledStatement(statement) {
var result = this.applyPluginsBailResult("label " + statement.label.name, statement);
Iif(result !== true)
this.walkStatement(statement.body);
};
Parser.prototype.walkWithStatement = function walkWithStatement(statement) {
this.walkExpression(statement.object);
this.walkStatement(statement.body);
};
Parser.prototype.walkSwitchStatement = function walkSwitchStatement(statement) {
this.walkExpression(statement.discriminant);
this.walkSwitchCases(statement.cases);
};
Parser.prototype.walkReturnStatement =
Parser.prototype.walkThrowStatement = function walkArgumentStatement(statement) {
if(statement.argument)
this.walkExpression(statement.argument);
};
Parser.prototype.walkTryStatement = function walkTryStatement(statement) {
Iif(this.scope.inTry) {
this.walkStatement(statement.block);
} else {
this.scope.inTry = true;
this.walkStatement(statement.block);
this.scope.inTry = false;
}
this.walkCatchClauses(statement.handlers);
Iif(statement.finalizer)
this.walkStatement(statement.finalizer);
};
Parser.prototype.walkWhileStatement =
Parser.prototype.walkDoWhileStatement = function walkLoopStatement(statement) {
this.walkExpression(statement.test);
this.walkStatement(statement.body);
};
Parser.prototype.walkForStatement = function walkForStatement(statement) {
if(statement.init) {
if(statement.init.type === "VariableDeclaration")
this.walkStatement(statement.init);
else
this.walkExpression(statement.init);
}
Eif(statement.test)
this.walkExpression(statement.test);
Eif(statement.update)
this.walkExpression(statement.update);
this.walkStatement(statement.body);
};
Parser.prototype.walkForInStatement = function walkForInStatement(statement) {
Eif(statement.left.type === "VariableDeclaration")
this.walkStatement(statement.left);
else
this.walkExpression(statement.left);
this.walkExpression(statement.right);
this.walkStatement(statement.body);
};
// Declarations
Parser.prototype.walkFunctionDeclaration = function walkFunctionDeclaration(statement) {
this.scope.renames["$"+statement.id.name] = undefined;
this.scope.definitions.push(statement.id.name);
this.inScope(statement.params, function() {
Eif(statement.body.type === "BlockStatement")
this.walkStatement(statement.body);
else
this.walkExpression(statement.body);
}.bind(this));
};
Parser.prototype.walkVariableDeclaration = function walkVariableDeclaration(statement) {
Eif(statement.declarations)
this.walkVariableDeclarators(statement.declarations);
};
Parser.prototype.walkSwitchCases = function walkSwitchCases(switchCases) {
switchCases.forEach(function(switchCase) {
if(switchCase.test)
this.walkExpression(switchCase.test);
this.walkStatements(switchCase.consequent);
}, this);
};
Parser.prototype.walkCatchClauses = function walkCatchClauses(catchClauses) {
catchClauses.forEach(function(catchClause) {
Iif(catchClause.guard)
this.walkExpression(catchClause.guard);
this.inScope([catchClause.param], function() {
this.walkStatement(catchClause.body);
}.bind(this));
}, this);
};
Parser.prototype.walkVariableDeclarators = function walkVariableDeclarators(declarators) {
declarators.forEach(function(declarator) {
switch(declarator.type) {
case "VariableDeclarator":
var renameIdentifier = declarator.init && this.getRenameIdentifier(declarator.init);
if(renameIdentifier && declarator.id.type === "Identifier" && this.applyPluginsBailResult("can-rename " + renameIdentifier, declarator.init)) {
// renaming with "var a = b;"
Eif(!this.applyPluginsBailResult("rename " + renameIdentifier, declarator.init)) {
this.scope.renames["$"+declarator.id.name] = this.scope.renames["$"+renameIdentifier] || renameIdentifier;
var idx = this.scope.definitions.indexOf(declarator.id.name);
if(idx >= 0) this.scope.definitions.splice(idx, 1);
}
} else Eif(declarator.id.type === "Identifier" && !this.applyPluginsBailResult("var " + declarator.id.name, declarator)) {
this.scope.renames["$"+declarator.id.name] = undefined;
this.scope.definitions.push(declarator.id.name);
if(declarator.init)
this.walkExpression(declarator.init);
} else {
this.walkExpression(declarator.id);
if(declarator.init)
this.walkExpression(declarator.init);
}
break;
}
}, this);
};
Parser.prototype.walkExpressions = function walkExpressions(expressions) {
expressions.forEach(function(expression) {
if(expression)
this.walkExpression(expression);
}, this);
};
Parser.prototype.walkExpression = function walkExpression(expression) {
if(this["walk" + expression.type])
return this["walk" + expression.type](expression);
};
Parser.prototype.walkArrayExpression = function walkArrayExpression(expression) {
Eif(expression.elements)
this.walkExpressions(expression.elements);
};
Parser.prototype.walkObjectExpression = function walkObjectExpression(expression) {
expression.properties.forEach(function(prop) {
this.walkExpression(prop.value);
}, this);
};
Parser.prototype.walkFunctionExpression = function walkFunctionExpression(expression) {
this.inScope(expression.params, function() {
Eif(expression.body.type === "BlockStatement")
this.walkStatement(expression.body);
else
this.walkExpression(expression.body);
}.bind(this));
};
Parser.prototype.walkSequenceExpression = function walkSequenceExpression(expression) {
Eif(expression.expressions)
this.walkExpressions(expression.expressions);
};
Parser.prototype.walkUpdateExpression = function walkUpdateExpression(expression) {
this.walkExpression(expression.argument);
};
Parser.prototype.walkUnaryExpression = function walkUnaryExpression(expression) {
if(expression.operator === "typeof") {
var expr = expression.argument;
var exprName = [];
while(expr.type === "MemberExpression" && expr.property.type === "Identifier") {
exprName.unshift(expr.property.name);
expr = expr.object;
}
if(expr.type === "Identifier" && this.scope.definitions.indexOf(expr.name) === -1) {
exprName.unshift(this.scope.renames["$"+expr.name] || expr.name);
exprName = exprName.join(".");
var result = this.applyPluginsBailResult("typeof " + exprName, expression);
if(result === true)
return;
}
}
this.walkExpression(expression.argument);
};
Parser.prototype.walkBinaryExpression =
Parser.prototype.walkLogicalExpression = function walkLeftRightExpression(expression) {
this.walkExpression(expression.left);
this.walkExpression(expression.right);
};
Parser.prototype.walkAssignmentExpression = function walkAssignmentExpression(expression) {
var renameIdentifier = this.getRenameIdentifier(expression.right);
if(expression.left.type === "Identifier" && renameIdentifier && !this.applyPluginsBailResult("rename " + renameIdentifier, expression.right)) {
// renaming "a = b;"
this.scope.renames["$"+expression.left.name] = renameIdentifier;
var idx = this.scope.definitions.indexOf(expression.left.name);
Eif(idx >= 0) this.scope.definitions.splice(idx, 1);
} else if(expression.left.type === "Identifier") {
Eif(!this.applyPluginsBailResult("assigned " + expression.left.name, expression)) {
this.walkExpression(expression.right);
}
this.scope.renames["$"+expression.left.name] = undefined;
if(!this.applyPluginsBailResult("assign " + expression.left.name, expression)) {
this.walkExpression(expression.left);
}
} else {
this.walkExpression(expression.right);
this.scope.renames["$"+expression.left.name] = undefined;
this.walkExpression(expression.left);
}
};
Parser.prototype.walkConditionalExpression = function walkConditionalExpression(expression) {
var result = this.applyPluginsBailResult("expression ?:", expression);
if(result === undefined) {
this.walkExpression(expression.test);
this.walkExpression(expression.consequent);
Eif(expression.alternate)
this.walkExpression(expression.alternate);
} else {
if(result)
this.walkExpression(expression.consequent);
else Eif(expression.alternate)
this.walkExpression(expression.alternate);
}
};
Parser.prototype.walkNewExpression = function walkNewExpression(expression) {
this.walkExpression(expression.callee);
Eif(expression.arguments)
this.walkExpressions(expression.arguments);
};
Parser.prototype.walkCallExpression = function walkCallExpression(expression) {
function walkIIFE(functionExpression, args) {
var params = functionExpression.params;
var args = args.map(function(arg, idx) {
var renameIdentifier = this.getRenameIdentifier(arg);
if(!renameIdentifier) {
this.walkExpression(arg);
return;
} else Iif(this.applyPluginsBailResult("rename " + renameIdentifier, arg)) {
return;
}
return renameIdentifier;
}, this);
this.inScope(params.filter(function(identifier, idx) {
return !args[idx];
}), function() {
args.forEach(function(arg, idx) {
if(!arg) return;
if(!params[idx] || params[idx].type !== "Identifier") return;
this.scope.renames["$"+params[idx].name] = arg;
}, this);
Eif(functionExpression.body.type === "BlockStatement")
this.walkStatement(functionExpression.body);
else
this.walkExpression(functionExpression.body);
}.bind(this));
}
if(expression.callee.type === "MemberExpression" && expression.callee.object.type === "FunctionExpression" && expression.callee.property.type === "Identifier" && ["call", "bind"].indexOf(expression.callee.property.name) >= 0 && expression.arguments && expression.arguments.length > 1) {
// (function(...) { }.call/bind(?, ...))
walkIIFE.call(this, expression.callee.object, expression.arguments.slice(1));
this.walkExpression(expression.arguments[0]);
} else if(expression.callee.type === "FunctionExpression" && expression.arguments) {
// (function(...) { }(...))
walkIIFE.call(this, expression.callee, expression.arguments);
} else {
var callee = this.evaluateExpression(expression.callee);
if(callee.isIdentifier()) {
var result = this.applyPluginsBailResult("call " + callee.identifier, expression);
if(result === true)
return;
}
Eif(expression.callee)
this.walkExpression(expression.callee);
Eif(expression.arguments)
this.walkExpressions(expression.arguments);
}
};
Parser.prototype.walkMemberExpression = function walkMemberExpression(expression) {
var expr = expression;
var exprName = [];
while(expr.type === "MemberExpression" && expr.property.type === "Identifier") {
exprName.unshift(expr.property.name);
expr = expr.object;
}
if(expr.type === "Identifier" && this.scope.definitions.indexOf(expr.name) === -1) {
exprName.unshift(this.scope.renames["$"+expr.name] || expr.name);
exprName = exprName.join(".");
var result = this.applyPluginsBailResult("expression " + exprName, expression);
if(result === true)
return;
}
this.walkExpression(expression.object);
if(expression.property.type !== "Identifier")
this.walkExpression(expression.property);
};
Parser.prototype.walkIdentifier = function walkIdentifier(expression) {
if(this.scope.definitions.indexOf(expression.name) === -1) {
var result = this.applyPluginsBailResult("expression " + (this.scope.renames["$"+expression.name] || expression.name), expression);
if(result === true)
return;
}
};
Parser.prototype.inScope = function inScope(params, fn) {
var oldScope = this.scope;
this.scope = {
inTry: false,
definitions: oldScope.definitions.slice(),
renames: Object.create(oldScope.renames)
};
params.forEach(function(param) {
Eif(typeof param !== "string") {
Iif(param.type !== "Identifier")
return;
param = param.name;
}
this.scope.renames["$"+param] = undefined;
this.scope.definitions.push(param);
}, this);
fn();
this.scope = oldScope;
};
Parser.prototype.evaluateExpression = function evaluateExpression(expression) {
var result = this.applyPluginsBailResult("evaluate " + expression.type, expression);
if(result !== undefined)
return result;
return new BasicEvaluatedExpression().setRange(expression.range);
};
Parser.prototype.parseString = function parseString(expression) {
switch(expression.type) {
case "BinaryExpression":
if(expression.operator === "+")
return this.parseString(expression.left) + this.parseString(expression.right);
break;
case "Literal":
return expression.value+"";
}
throw new Error(expression.type + " is not supported as parameter for require");
};
Parser.prototype.parseCalculatedString = function parseCalculatedString(expression) {
switch(expression.type) {
case "BinaryExpression":
if(expression.operator === "+") {
var left = this.parseCalculatedString(expression.left);
var right = this.parseCalculatedString(expression.right);
if(left.code) {
return {range: left.range, value: left.value, code: true};
} else if(right.code) {
return {range: [left.range[0], right.range ? right.range[1] : left.range[1]], value: left.value + right.value, code: true};
} else {
return {range: [left.range[0], right.range[1]], value: left.value + right.value};
}
}
break;
case "ConditionalExpression":
var consequent = this.parseCalculatedString(expression.consequent);
var alternate = this.parseCalculatedString(expression.alternate);
var items = [];
if(consequent.conditional)
Array.prototype.push.apply(items, consequent.conditional);
else if(!consequent.code)
items.push(consequent);
else break;
if(alternate.conditional)
Array.prototype.push.apply(items, alternate.conditional);
else if(!alternate.code)
items.push(alternate);
else break;
return {value: "", code: true, conditional: items};
case "Literal":
return {range: expression.range, value: expression.value+""};
break;
}
return {value: "", code: true};
};
["parseString", "parseCalculatedString"].forEach(function(fn) {
Parser.prototype[fn + "Array"] = function parseXXXArray(expression) {
switch(expression.type) {
case "ArrayExpression":
var arr = [];
if(expression.elements)
expression.elements.forEach(function(expr) {
arr.push(this[fn](expr));
}, this);
return arr;
}
return [this[fn](expression)];
};
});
Parser.prototype.parse = function parse(source, initialState) {
var ast = esprima.parse(source, {range: true, loc: true, raw: true});
Iif(!ast || typeof ast !== "object")
throw new Error("Source couldn't be parsed");
var oldScope = this.scope;
var oldState = this.state;
this.scope = {
inTry: false,
definitions: [],
renames: {}
};
var state = this.state = initialState || {};
Eif(this.applyPluginsBailResult("program", ast) === undefined)
this.walkStatements(ast.body);
this.scope = oldScope;
this.state = oldState;
return state;
};
Parser.prototype.evaluate = function evaluate(source) {
var ast = esprima.parse("("+source+")", {range: true, loc: true, raw: true});
Iif(!ast || typeof ast !== "object" || ast.type !== "Program")
throw new Error("evaluate: Source couldn't be parsed");
Iif(ast.body.length !== 1 || ast.body[0].type !== "ExpressionStatement")
throw new Error("evaluate: Source is not a expression");
return this.evaluateExpression(ast.body[0].expression);
};
|