-
Notifications
You must be signed in to change notification settings - Fork 1.2k
/
output.js
1972 lines (1862 loc) · 65.6 KB
/
output.js
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
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/***********************************************************************
A JavaScript tokenizer / parser / beautifier / compressor.
https://github.com/mishoo/UglifyJS
-------------------------------- (C) ---------------------------------
Author: Mihai Bazon
<mihai.bazon@gmail.com>
http://mihai.bazon.net/blog
Distributed under the BSD license:
Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above
copyright notice, this list of conditions and the following
disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials
provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
***********************************************************************/
"use strict";
function is_some_comments(comment) {
// multiline comment
return comment.type == "comment2" && /@preserve|@license|@cc_on/i.test(comment.value);
}
function OutputStream(options) {
options = defaults(options, {
annotations : false,
ascii_only : false,
beautify : false,
braces : false,
comments : false,
extendscript : false,
galio : false,
ie : false,
indent_level : 4,
indent_start : 0,
inline_script : true,
keep_quoted_props: false,
max_line_len : false,
preamble : null,
preserve_line : false,
quote_keys : false,
quote_style : 0,
semicolons : true,
shebang : true,
source_map : null,
v8 : false,
webkit : false,
width : 80,
wrap_iife : false,
}, true);
// Convert comment option to RegExp if necessary and set up comments filter
var comment_filter = return_false; // Default case, throw all comments away
if (options.comments) {
var comments = options.comments;
if (typeof options.comments === "string" && /^\/.*\/[a-zA-Z]*$/.test(options.comments)) {
var regex_pos = options.comments.lastIndexOf("/");
comments = new RegExp(
options.comments.substr(1, regex_pos - 1),
options.comments.substr(regex_pos + 1)
);
}
if (comments instanceof RegExp) {
comment_filter = function(comment) {
return comment.type != "comment5" && comments.test(comment.value);
};
} else if (typeof comments === "function") {
comment_filter = function(comment) {
return comment.type != "comment5" && comments(this, comment);
};
} else if (comments === "some") {
comment_filter = is_some_comments;
} else { // NOTE includes "all" option
comment_filter = return_true;
}
}
function make_indent(value) {
if (typeof value == "number") return new Array(value + 1).join(" ");
if (!value) return "";
if (!/^\s*$/.test(value)) throw new Error("unsupported indentation: " + JSON.stringify("" + value));
return value;
}
var current_col = 0;
var current_line = 1;
var current_indent = make_indent(options.indent_start);
var full_indent = make_indent(options.indent_level);
var half_indent = full_indent.length + 1 >> 1;
var last;
var line_end = 0;
var line_fixed = true;
var mappings = options.source_map && [];
var mapping_name;
var mapping_token;
var might_need_space;
var might_need_semicolon;
var need_newline_indented = false;
var need_space = false;
var output;
var stack;
var stored = "";
function reset() {
last = "";
might_need_space = false;
might_need_semicolon = false;
stack = [];
var str = output;
output = "";
return str;
}
reset();
var to_utf8 = options.ascii_only ? function(str, identifier) {
if (identifier) str = str.replace(/[\ud800-\udbff][\udc00-\udfff]/g, function(ch) {
return "\\u{" + (ch.charCodeAt(0) - 0xd7c0 << 10 | ch.charCodeAt(1) - 0xdc00).toString(16) + "}";
});
return str.replace(/[\u0000-\u001f\u007f-\uffff]/g, function(ch) {
var code = ch.charCodeAt(0).toString(16);
if (code.length <= 2 && !identifier) {
while (code.length < 2) code = "0" + code;
return "\\x" + code;
} else {
while (code.length < 4) code = "0" + code;
return "\\u" + code;
}
});
} : function(str) {
var s = "";
for (var i = 0, j = 0; i < str.length; i++) {
var code = str.charCodeAt(i);
if (is_surrogate_pair_head(code)) {
if (is_surrogate_pair_tail(str.charCodeAt(i + 1))) {
i++;
continue;
}
} else if (!is_surrogate_pair_tail(code)) {
continue;
}
s += str.slice(j, i) + "\\u" + code.toString(16);
j = i + 1;
}
return j == 0 ? str : s + str.slice(j);
};
function quote_single(str) {
return "'" + str.replace(/\x27/g, "\\'") + "'";
}
function quote_double(str) {
return '"' + str.replace(/\x22/g, '\\"') + '"';
}
var quote_string = [
null,
quote_single,
quote_double,
function(str, quote) {
return quote == "'" ? quote_single(str) : quote_double(str);
},
][options.quote_style] || function(str, quote, dq, sq) {
return dq > sq ? quote_single(str) : quote_double(str);
};
function make_string(str, quote) {
var dq = 0, sq = 0;
str = str.replace(/[\\\b\f\n\r\v\t\x22\x27\u2028\u2029\0\ufeff]/g, function(s, i) {
switch (s) {
case '"': ++dq; return '"';
case "'": ++sq; return "'";
case "\\": return "\\\\";
case "\n": return "\\n";
case "\r": return "\\r";
case "\t": return "\\t";
case "\b": return "\\b";
case "\f": return "\\f";
case "\x0B": return options.ie ? "\\x0B" : "\\v";
case "\u2028": return "\\u2028";
case "\u2029": return "\\u2029";
case "\ufeff": return "\\ufeff";
case "\0":
return /[0-9]/.test(str.charAt(i+1)) ? "\\x00" : "\\0";
}
return s;
});
return quote_string(to_utf8(str), quote, dq, sq);
}
/* -----[ beautification/minification ]----- */
var adjust_mappings = mappings ? function(line, col) {
mappings.forEach(function(mapping) {
mapping.line += line;
mapping.col += col;
});
} : noop;
var flush_mappings = mappings ? function() {
mappings.forEach(function(mapping) {
options.source_map.add(
mapping.token.file,
mapping.line, mapping.col,
mapping.token.line, mapping.token.col,
!mapping.name && mapping.token.type == "name" ? mapping.token.value : mapping.name
);
});
mappings = [];
} : noop;
function insert_newlines(count) {
stored += output.slice(0, line_end);
output = output.slice(line_end);
var new_col = output.length;
adjust_mappings(count, new_col - current_col);
current_line += count;
current_col = new_col;
while (count--) stored += "\n";
}
var fix_line = options.max_line_len ? function(flush) {
if (line_fixed) {
if (current_col > options.max_line_len) {
AST_Node.warn("Output exceeds {max_line_len} characters", options);
}
return;
}
if (current_col > options.max_line_len) {
insert_newlines(1);
line_fixed = true;
}
if (line_fixed || flush) flush_mappings();
} : noop;
var stat_end_chars = makePredicate("; }");
var asi_skip_chars = makePredicate("( [ + * / - , . `");
var asi_skip_words = makePredicate("in instanceof");
function require_space(prev, ch, str) {
return is_identifier_char(prev) && (is_identifier_char(ch) || ch == "\\")
|| (ch == "/" && ch == prev)
|| ((ch == "+" || ch == "-") && ch == last)
|| last == "--" && ch == ">"
|| last == "!" && str == "--"
|| prev == "/" && (str == "in" || str == "instanceof");
}
var print = options.beautify
|| options.comments
|| options.max_line_len
|| options.preserve_line
|| options.shebang
|| !options.semicolons
|| options.source_map
|| options.width ? function(str) {
var ch = str.charAt(0);
if (need_newline_indented && ch) {
need_newline_indented = false;
if (ch != "\n") {
print("\n");
indent();
}
}
if (need_space && ch) {
need_space = false;
if (!/[\s;})]/.test(ch)) {
space();
}
}
var prev = last.slice(-1);
if (might_need_semicolon) {
might_need_semicolon = false;
if (prev != ";" && !stat_end_chars[ch]) {
var need_semicolon = asi_skip_chars[ch] || asi_skip_words[str];
if (need_semicolon || options.semicolons) {
output += ";";
current_col++;
if (!line_fixed) {
fix_line();
if (line_fixed && !need_semicolon && output == ";") {
output = "";
current_col = 0;
}
}
if (line_end == output.length - 1) line_end++;
} else {
fix_line();
output += "\n";
current_line++;
current_col = 0;
// reset the semicolon flag, since we didn't print one
// now and might still have to later
if (/^\s+$/.test(str)) might_need_semicolon = true;
}
if (!options.beautify) might_need_space = false;
}
}
if (might_need_space) {
if (require_space(prev, ch, str)) {
output += " ";
current_col++;
}
if (prev != "<" || str != "!") might_need_space = false;
}
if (mapping_token) {
mappings.push({
token: mapping_token,
name: mapping_name,
line: current_line,
col: current_col,
});
mapping_token = false;
if (line_fixed) flush_mappings();
}
output += str;
var a = str.split(/\r?\n/), n = a.length - 1;
current_line += n;
current_col += a[0].length;
if (n > 0) {
fix_line();
current_col = a[n].length;
}
last = str;
} : function(str) {
var ch = str.charAt(0);
var prev = last.slice(-1);
if (might_need_semicolon) {
might_need_semicolon = false;
if (prev == ":" && ch == "}" || (!ch || ";}".indexOf(ch) < 0) && prev != ";") {
output += ";";
might_need_space = false;
}
}
if (might_need_space) {
if (require_space(prev, ch, str)) output += " ";
if (prev != "<" || str != "!") might_need_space = false;
}
output += str;
last = str;
};
var space = options.beautify ? function() {
print(" ");
} : function() {
might_need_space = true;
};
var indent = options.beautify ? function(half) {
if (need_newline_indented) print("\n");
print(half ? current_indent.slice(0, -half_indent) : current_indent);
} : noop;
var with_indent = options.beautify ? function(cont) {
var save_indentation = current_indent;
current_indent += full_indent;
cont();
current_indent = save_indentation;
} : function(cont) { cont() };
var may_add_newline = options.max_line_len || options.preserve_line ? function() {
fix_line();
line_end = output.length;
line_fixed = false;
} : noop;
var newline = options.beautify ? function() {
print("\n");
line_end = output.length;
} : may_add_newline;
var semicolon = options.beautify ? function() {
print(";");
} : function() {
might_need_semicolon = true;
};
function force_semicolon() {
if (might_need_semicolon) print(";");
print(";");
}
function with_block(cont, end) {
print("{");
newline();
with_indent(cont);
add_mapping(end);
indent();
print("}");
}
function with_parens(cont) {
print("(");
may_add_newline();
cont();
may_add_newline();
print(")");
}
function with_square(cont) {
print("[");
may_add_newline();
cont();
may_add_newline();
print("]");
}
function comma() {
may_add_newline();
print(",");
may_add_newline();
space();
}
function colon() {
print(":");
space();
}
var add_mapping = mappings ? function(token, name) {
mapping_token = token;
mapping_name = name;
} : noop;
function get() {
if (!line_fixed) fix_line(true);
return stored + output;
}
function has_nlb() {
return /(^|\n) *$/.test(output);
}
function pad_comment(token, force) {
if (need_newline_indented) return;
if (token.nlb && (force || !has_nlb())) {
need_newline_indented = true;
} else if (force) {
need_space = true;
}
}
function print_comment(comment) {
var value = comment.value.replace(/[@#]__PURE__/g, " ");
if (/^\s*$/.test(value) && !/^\s*$/.test(comment.value)) return false;
if (/comment[134]/.test(comment.type)) {
print("//" + value);
need_newline_indented = true;
} else if (comment.type == "comment2") {
print("/*" + value + "*/");
}
return true;
}
function should_merge_comments(node, parent) {
if (parent instanceof AST_Binary) return parent.left === node;
if (parent.TYPE == "Call") return parent.expression === node;
if (parent instanceof AST_Conditional) return parent.condition === node;
if (parent instanceof AST_Dot) return parent.expression === node;
if (parent instanceof AST_Exit) return true;
if (parent instanceof AST_Sequence) return parent.expressions[0] === node;
if (parent instanceof AST_Sub) return parent.expression === node;
if (parent instanceof AST_UnaryPostfix) return true;
if (parent instanceof AST_Yield) return true;
}
function prepend_comments(node) {
var self = this;
var scan;
if (node instanceof AST_Exit) {
scan = node.value;
} else if (node instanceof AST_Yield) {
scan = node.expression;
}
var comments = dump(node);
if (!comments) comments = [];
if (scan) {
var tw = new TreeWalker(function(node) {
if (!should_merge_comments(node, tw.parent())) return true;
var before = dump(node);
if (before) comments = comments.concat(before);
});
tw.push(node);
scan.walk(tw);
}
if (current_line == 1 && current_col == 0) {
if (comments.length > 0 && options.shebang && comments[0].type == "comment5") {
print("#!" + comments.shift().value + "\n");
indent();
}
var preamble = options.preamble;
if (preamble) print(preamble.replace(/\r\n?|\u2028|\u2029|(^|\S)\s*$/g, "$1\n"));
}
comments = comments.filter(comment_filter, node);
var printed = false;
comments.forEach(function(comment, index) {
pad_comment(comment, index);
if (print_comment(comment)) printed = true;
});
if (printed) pad_comment(node.start, true);
function dump(node) {
var token = node.start;
if (!token) {
if (!scan) return;
node.start = token = new AST_Token();
}
var comments = token.comments_before;
if (!comments) {
if (!scan) return;
token.comments_before = comments = [];
}
if (comments._dumped === self) return;
comments._dumped = self;
return comments;
}
}
function append_comments(node, tail) {
var self = this;
var token = node.end;
if (!token) return;
var comments = token[tail ? "comments_before" : "comments_after"];
if (!comments || comments._dumped === self) return;
if (!(node instanceof AST_Statement || all(comments, function(c) {
return !/comment[134]/.test(c.type);
}))) return;
comments._dumped = self;
comments.filter(comment_filter, node).forEach(function(comment, index) {
pad_comment(comment, index || !tail);
print_comment(comment);
});
}
return {
get : get,
reset : reset,
indent : indent,
should_break : options.beautify && options.width ? function() {
return current_col >= options.width;
} : return_false,
has_parens : function() { return last.slice(-1) == "(" },
newline : newline,
print : print,
space : space,
comma : comma,
colon : colon,
last : function() { return last },
semicolon : semicolon,
force_semicolon : force_semicolon,
to_utf8 : to_utf8,
print_name : function(name) { print(to_utf8(name.toString(), true)) },
print_string : options.inline_script ? function(str, quote) {
str = make_string(str, quote).replace(/<\x2f(script)([>\/\t\n\f\r ])/gi, "<\\/$1$2");
print(str.replace(/\x3c!--/g, "\\x3c!--").replace(/--\x3e/g, "--\\x3e"));
} : function(str, quote) {
print(make_string(str, quote));
},
with_indent : with_indent,
with_block : with_block,
with_parens : with_parens,
with_square : with_square,
add_mapping : add_mapping,
option : function(opt) { return options[opt] },
prepend_comments: options.comments || options.shebang ? prepend_comments : noop,
append_comments : options.comments ? append_comments : noop,
push_node : function(node) { stack.push(node) },
pop_node : options.preserve_line ? function() {
var node = stack.pop();
if (node.start && node.start.line > current_line) {
insert_newlines(node.start.line - current_line);
}
} : function() {
stack.pop();
},
parent : function(n) {
return stack[stack.length - 2 - (n || 0)];
},
};
}
/* -----[ code generators ]----- */
(function() {
/* -----[ utils ]----- */
function DEFPRINT(nodetype, generator) {
nodetype.DEFMETHOD("_codegen", generator);
}
var use_asm = false;
AST_Node.DEFMETHOD("print", function(stream, force_parens) {
var self = this;
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
}
stream.pop_node();
function doit() {
stream.prepend_comments(self);
self.add_source_map(stream);
self._codegen(stream);
stream.append_comments(self);
}
});
var readonly = OutputStream({
inline_script: false,
shebang: false,
width: false,
});
AST_Node.DEFMETHOD("print_to_string", function(options) {
if (options) {
var stream = OutputStream(options);
this.print(stream);
return stream.get();
}
this.print(readonly);
return readonly.reset();
});
/* -----[ PARENTHESES ]----- */
function PARENS(nodetype, func) {
nodetype.DEFMETHOD("needs_parens", func);
}
PARENS(AST_Node, return_false);
// a function expression needs parens around it when it's provably
// the first token to appear in a statement.
function needs_parens_function(output) {
var p = output.parent();
if (!output.has_parens() && first_in_statement(output, false, true)) {
// export default function() {}
// export default (function foo() {});
// export default (function() {})(foo);
// export default (function() {})`foo`;
// export default (function() {}) ? foo : bar;
return this.name || !(p instanceof AST_ExportDefault);
}
if (output.option("webkit") && p instanceof AST_PropAccess && p.expression === this) return true;
if (output.option("wrap_iife") && p instanceof AST_Call && p.expression === this) return true;
}
PARENS(AST_AsyncFunction, needs_parens_function);
PARENS(AST_AsyncGeneratorFunction, needs_parens_function);
PARENS(AST_ClassExpression, needs_parens_function);
PARENS(AST_Function, needs_parens_function);
PARENS(AST_GeneratorFunction, needs_parens_function);
// same goes for an object literal, because otherwise it would be
// interpreted as a block of code.
function needs_parens_obj(output) {
return !output.has_parens() && first_in_statement(output, true);
}
PARENS(AST_Object, needs_parens_obj);
function needs_parens_unary(output) {
var p = output.parent();
// (-x) ** y
if (p instanceof AST_Binary) return p.operator == "**" && p.left === this;
// (await x)(y)
// new (await x)
if (p instanceof AST_Call) return p.expression === this;
// class extends (x++) {}
// class x extends (typeof y) {}
if (p instanceof AST_Class) return true;
// (x++)[y]
// (typeof x).y
// https://github.com/mishoo/UglifyJS/issues/115
if (p instanceof AST_PropAccess) return p.expression === this;
// (~x)`foo`
if (p instanceof AST_Template) return p.tag === this;
}
PARENS(AST_Await, needs_parens_unary);
PARENS(AST_Unary, needs_parens_unary);
PARENS(AST_Sequence, function(output) {
var p = output.parent();
// [ 1, (2, 3), 4 ] ---> [ 1, 3, 4 ]
return p instanceof AST_Array
// () ---> (foo, bar)
|| is_arrow(p) && p.value === this
// await (foo, bar)
|| p instanceof AST_Await
// 1 + (2, 3) + 4 ---> 8
|| p instanceof AST_Binary
// new (foo, bar) or foo(1, (2, 3), 4)
|| p instanceof AST_Call
// class extends (foo, bar) {}
// class foo extends (bar, baz) {}
|| p instanceof AST_Class
// class { foo = (bar, baz) }
// class { [(foo, bar)]() {} }
|| p instanceof AST_ClassProperty
// (false, true) ? (a = 10, b = 20) : (c = 30)
// ---> 20 (side effect, set a := 10 and b := 20)
|| p instanceof AST_Conditional
// [ a = (1, 2) ] = [] ---> a == 2
|| p instanceof AST_DefaultValue
// { [(1, 2)]: foo } = bar
// { 1: (2, foo) } = bar
|| p instanceof AST_DestructuredKeyVal
// export default (foo, bar)
|| p instanceof AST_ExportDefault
// for (foo of (bar, baz));
|| p instanceof AST_ForOf
// { [(1, 2)]: 3 }[2] ---> 3
// { foo: (1, 2) }.foo ---> 2
|| p instanceof AST_ObjectProperty
// (1, {foo:2}).foo or (1, {foo:2})["foo"] ---> 2
|| p instanceof AST_PropAccess && p.expression === this
// ...(foo, bar, baz)
|| p instanceof AST_Spread
// (foo, bar)`baz`
|| p instanceof AST_Template && p.tag === this
// !(foo, bar, baz)
|| p instanceof AST_Unary
// var a = (1, 2), b = a + a; ---> b == 4
|| p instanceof AST_VarDef
// yield (foo, bar)
|| p instanceof AST_Yield;
});
PARENS(AST_Binary, function(output) {
var p = output.parent();
// await (foo && bar)
if (p instanceof AST_Await) return true;
// this deals with precedence:
// 3 * (2 + 1)
// 3 - (2 - 1)
// (1 ** 2) ** 3
if (p instanceof AST_Binary) {
var po = p.operator, pp = PRECEDENCE[po];
var so = this.operator, sp = PRECEDENCE[so];
return pp > sp
|| po == "??" && (so == "&&" || so == "||")
|| (pp == sp && this === p[po == "**" ? "left" : "right"]);
}
// (foo && bar)()
if (p instanceof AST_Call) return p.expression === this;
// class extends (foo && bar) {}
// class foo extends (bar || null) {}
if (p instanceof AST_Class) return true;
// (foo && bar)["prop"], (foo && bar).prop
if (p instanceof AST_PropAccess) return p.expression === this;
// (foo && bar)``
if (p instanceof AST_Template) return p.tag === this;
// typeof (foo && bar)
if (p instanceof AST_Unary) return true;
});
function need_chain_parens(node, parent) {
if (!node.terminal) return false;
if (!(parent instanceof AST_Call || parent instanceof AST_PropAccess)) return false;
return parent.expression === node;
}
PARENS(AST_PropAccess, function(output) {
var node = this;
var p = output.parent();
// i.e. new (foo().bar)
//
// if there's one call into this subtree, then we need
// parens around it too, otherwise the call will be
// interpreted as passing the arguments to the upper New
// expression.
if (p instanceof AST_New && p.expression === node && root_expr(node).TYPE == "Call") return true;
// (foo?.bar)()
// (foo?.bar).baz
// new (foo?.bar)()
return need_chain_parens(node, p);
});
PARENS(AST_Call, function(output) {
var node = this;
var p = output.parent();
if (p instanceof AST_New) return p.expression === node;
// https://bugs.webkit.org/show_bug.cgi?id=123506
if (output.option("webkit")
&& node.expression instanceof AST_Function
&& p instanceof AST_PropAccess
&& p.expression === node) {
var g = output.parent(1);
if (g instanceof AST_Assign && g.left === p) return true;
}
// (foo?.())()
// (foo?.()).bar
// new (foo?.())()
return need_chain_parens(node, p);
});
PARENS(AST_New, function(output) {
if (need_constructor_parens(this, output)) return false;
var p = output.parent();
// (new foo)(bar)
if (p instanceof AST_Call) return p.expression === this;
// (new Date).getTime(), (new Date)["getTime"]()
if (p instanceof AST_PropAccess) return true;
// (new foo)`bar`
if (p instanceof AST_Template) return p.tag === this;
});
PARENS(AST_Number, function(output) {
if (!output.option("galio")) return false;
// https://github.com/mishoo/UglifyJS/pull/1009
var p = output.parent();
return p instanceof AST_PropAccess && p.expression === this && /^0/.test(make_num(this.value));
});
function needs_parens_assign_cond(self, output) {
var p = output.parent();
// await (a = foo)
if (p instanceof AST_Await) return true;
// 1 + (a = 2) + 3 → 6, side effect setting a = 2
if (p instanceof AST_Binary) return !(p instanceof AST_Assign);
// (a = func)() —or— new (a = Object)()
if (p instanceof AST_Call) return p.expression === self;
// class extends (a = foo) {}
// class foo extends (bar ? baz : moo) {}
if (p instanceof AST_Class) return true;
// (a = foo) ? bar : baz
if (p instanceof AST_Conditional) return p.condition === self;
// (a = foo)["prop"] —or— (a = foo).prop
if (p instanceof AST_PropAccess) return p.expression === self;
// (a = foo)`bar`
if (p instanceof AST_Template) return p.tag === self;
// !(a = false) → true
if (p instanceof AST_Unary) return true;
}
PARENS(AST_Arrow, function(output) {
return needs_parens_assign_cond(this, output);
});
PARENS(AST_Assign, function(output) {
if (needs_parens_assign_cond(this, output)) return true;
// v8 parser bug ---> workaround
// f([1], [a] = []) ---> f([1], ([a] = []))
if (output.option("v8")) return this.left instanceof AST_Destructured;
// ({ p: a } = o);
if (this.left instanceof AST_DestructuredObject) return needs_parens_obj(output);
});
PARENS(AST_AsyncArrow, function(output) {
return needs_parens_assign_cond(this, output);
});
PARENS(AST_Conditional, function(output) {
return needs_parens_assign_cond(this, output)
// https://github.com/mishoo/UglifyJS/issues/1144
|| output.option("extendscript") && output.parent() instanceof AST_Conditional;
});
PARENS(AST_Yield, function(output) {
return needs_parens_assign_cond(this, output);
});
/* -----[ PRINTERS ]----- */
DEFPRINT(AST_Directive, function(output) {
var quote = this.quote;
var value = this.value;
switch (output.option("quote_style")) {
case 0:
case 2:
if (value.indexOf('"') == -1) quote = '"';
break;
case 1:
if (value.indexOf("'") == -1) quote = "'";
break;
}
output.print(quote + value + quote);
output.semicolon();
});
DEFPRINT(AST_Debugger, function(output) {
output.print("debugger");
output.semicolon();
});
/* -----[ statements ]----- */
function display_body(body, is_toplevel, output, allow_directives) {
var last = body.length - 1;
var in_directive = allow_directives;
var was_asm = use_asm;
body.forEach(function(stmt, i) {
if (in_directive) {
if (stmt instanceof AST_Directive) {
if (stmt.value == "use asm") use_asm = true;
} else if (!(stmt instanceof AST_EmptyStatement)) {
if (stmt instanceof AST_SimpleStatement && stmt.body instanceof AST_String) {
output.force_semicolon();
}
in_directive = false;
}
}
if (stmt instanceof AST_EmptyStatement) return;
output.indent();
stmt.print(output);
if (i == last && is_toplevel) return;
output.newline();
if (is_toplevel) output.newline();
});
use_asm = was_asm;
}
DEFPRINT(AST_Toplevel, function(output) {
display_body(this.body, true, output, true);
output.print("");
});
DEFPRINT(AST_LabeledStatement, function(output) {
this.label.print(output);
output.colon();
var body = this.body;
if (body instanceof AST_EmptyStatement) {
output.force_semicolon();
} else {
body.print(output);
}
});
DEFPRINT(AST_SimpleStatement, function(output) {
this.body.print(output);
output.semicolon();
});
function print_braced_empty(self, output) {
output.print("{");
output.with_indent(function() {
output.append_comments(self, true);
});
output.print("}");
}
function print_braced(self, output, allow_directives) {
if (self.body.length > 0) {
output.with_block(function() {
display_body(self.body, false, output, allow_directives);
}, self.end);
} else print_braced_empty(self, output);
}
DEFPRINT(AST_BlockStatement, function(output) {
print_braced(this, output);
});
DEFPRINT(AST_EmptyStatement, function(output) {
output.semicolon();
});
DEFPRINT(AST_Do, function(output) {
var self = this;
output.print("do");
make_block(self.body, output);
output.space();
output.print("while");
output.space();
output.with_parens(function() {
self.condition.print(output);
});
output.semicolon();
});
DEFPRINT(AST_While, function(output) {
var self = this;
output.print("while");
output.space();
output.with_parens(function() {
self.condition.print(output);
});
force_statement(self.body, output);
});
DEFPRINT(AST_For, function(output) {
var self = this;
output.print("for");