JoBoEVD/UglifyJS
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1395 Commits

Author SHA1 Message Date
Alex Lam S.L
07e4b64f3a
fix AST_Scope.clone() (#2803) 
fixes #2799
 2018-01-17 21:33:13 +08:00
Alex Lam S.L
d3ce2bc9e7
suppress unsafe_proto for LHS expressions (#2804) 2018-01-17 20:41:51 +08:00
Alex Lam S.L
79cfac77bd
extend join_vars & sequences (#2798) 2018-01-17 13:58:27 +08:00
Alex Lam S.L
b4aef753e7
general improvements around AST_ForIn (#2796) 
- compress using `collapse_vars`
- remove unused `name`
- simplify `loop_body`
 2018-01-16 17:03:12 +08:00
Alex Lam S.L
10f961c27b
enhance collapse_vars (#2788) 2018-01-15 18:47:23 +08:00
Alex Lam S.L
b483678ca7
avoid suboptimal termination in passes (#2787) 2018-01-15 16:42:31 +08:00
Alex Lam S.L
cbbe6fad60
avoid double counting within single-use functions (#2785) 
fixes #2783
 2018-01-15 16:42:15 +08:00
Alex Lam S.L
62a66dfff4
fix & extend join_vars for object assigments (#2781) 2018-01-14 17:11:31 +08:00
kzc
2cab348341 improve SymbolDef info in --output ast (#2778) 
* SymbolDef info (a.k.a. `thedef`) is now represented as a string containing `"ID name [mangled_name]"`. 
* Enhance display of `globals`, `variables`, `functions` and `enclosed`.
* `SymbolDef.next_id` starts at `1` and the `id` is adjusted for `-o ast` display.
 2018-01-14 01:40:51 +08:00
Alex Lam S.L
e49416e4aa
fix reduce_vars on AST_Accessor (#2776) 
fixes #2774
 2018-01-13 02:46:14 +08:00
kzc
d4d7d99b70 add SymbolDef IDs to --output ast (#2772) 2018-01-12 15:41:09 +08:00
Alex Lam S.L
6a696d0a7b
fix output of imported AST (#2771) 2018-01-12 01:05:49 +08:00
Alex Lam S.L
b757450cd8
fix nested unused assignments (#2769) 
fixes #2768
 2018-01-11 23:13:44 +08:00
Alex Lam S.L
23ec484806
fix corner case in #2763 (#2766) 2018-01-11 21:18:08 +08:00
Alex Lam S.L
f1e1bb419a
join object assignments (#2763) 2018-01-11 17:08:21 +08:00
Alex Lam S.L
6a0af85c8b
skip only vars in if_return (#2759) 
fixes #2747
 2018-01-10 19:08:46 +08:00
Alex Lam S.L
09269be974
enhance conditionals (#2758) 
`x ? y || z : z` --> `x && y || z`
 2018-01-10 16:59:57 +08:00
Alex Lam S.L
bf832cde16
improve synergy between compress and rename (#2755) 2018-01-09 17:55:41 +08:00
Alex Lam S.L
2972d58dbb
patch variable declaractions extracted within catch (#2753) 
fixes #2749
 2018-01-09 13:54:35 +08:00
Alex Lam S.L
2e22d38a02
improve rename reproducibility (#2754) 
fixes #2752
 2018-01-09 13:53:05 +08:00
Alex Lam S.L
ce27bcd69a
compress loops with immediate break (#2746) 
fixes #2740
 2018-01-08 14:30:18 +08:00
Alex Lam S.L
1ee8be8d91
fix recursive function inline (#2738) 
fixes #2737
 2018-01-07 15:31:24 +08:00
Alex Lam S.L
659c8a7632
handle trailing line comments correctly (#2736) 
fixes #2734
 2018-01-06 21:05:21 +08:00
Alex Lam S.L
3564b4f20d
compress RegExp() in unsafe (#2735) 2018-01-06 21:04:47 +08:00
Alex Lam S.L
3505a3604a
enhance unsafe_proto (#2733) 2018-01-06 06:16:51 +08:00
Alex Lam S.L
9f23185f2b
fix corner case with arguments as function name (#2729) 
fixes #2728
 2018-01-05 22:21:18 +08:00
Alex Lam S.L
b82feb9302
improve if_return (#2727) 2018-01-05 20:24:30 +08:00
Alex Lam S.L
7f2a591c7e
warn on deprecated features (#2726) 
- `function.arguments`
- `function.callers`

fixes #2719
 2018-01-05 19:36:02 +08:00
Alex Lam S.L
afbcebddf6
fix mangle name collision across files (#2722) 2018-01-05 05:08:09 +08:00
Alex Lam S.L
484e484571
fix corner case in inline (#2720) 2018-01-04 23:38:37 +08:00
Alex Lam S.L
a6873a3859
forbid block-scoped AST_Defun in strict mode (#2718) 2018-01-04 18:45:51 +08:00
Alex Lam S.L
7a6d452b54
preserve constant modification under strict mode (#2717) 2018-01-04 15:53:53 +08:00
Alex Lam S.L
9b58b54e2d
extend inline (#2714) 
- compress `function` with variables within loops
- restrict to `AST_Var` for better compatibility with ES6+
 2018-01-04 12:58:40 +08:00
Alex Lam S.L
c598a12af9
apply collapse_vars to loop conditions (#2712) 2018-01-04 03:18:28 +08:00
Alex Lam S.L
cfe3a98ce5
drop unused assignment based on reduce_vars (#2709) 2018-01-04 01:03:33 +08:00
Alex Lam S.L
14778e049b
fix reduce_vars on AST_Defun (#2708) 2018-01-03 17:18:38 +08:00
Alex Lam S.L
446fb0198b
extend __PURE__ to AST_New (#2706) 
fixes #2705
 2018-01-03 04:48:07 +08:00
Alex Lam S.L
7d3cddf9d6
inline functions with AST_Var (#2688) 2018-01-03 01:54:44 +08:00
Alex Lam S.L
6dead95eb3
enhance collapse_vars (#2704) 2018-01-02 18:42:15 +08:00
Alex Lam S.L
cc931b3ad8
enhance if_return (#2703) 2018-01-02 15:09:51 +08:00
Alex Lam S.L
d838b4b52e
reset argument value within loop after inline (#2699) 2018-01-02 01:24:53 +08:00
Alex Lam S.L
2f3bddbaca
scan within IIFEs of assigned values (#2702) 
fixes #2701
 2018-01-02 01:24:23 +08:00
Alex Lam S.L
673b071637
enhance join_vars & sequences (#2697) 
- nudge declarations without assignments
  - within `AST_BlockStatement`
  - across `AST_If`
 2018-01-01 00:09:26 +08:00
Alex Lam S.L
da82fa59a7
fix inline on duplicate argument names (#2698) 2017-12-31 20:59:58 +08:00
Alex Lam S.L
333792352e
reduce hoisting declarations (#2687) 2017-12-31 16:15:00 +08:00
Alex Lam S.L
ed7a0a454e
fix dead_code on escaped return assignment (#2693) 
fixes #2692
 2017-12-30 15:20:25 +08:00
Alex Lam S.L
d819559a01
minor clean-ups (#2686) 2017-12-29 14:04:52 +08:00
Alex Lam S.L
b95e3338d9
fix pure_getters on AST_Binary (#2681) 
fixes #2678
 2017-12-28 17:01:01 +08:00
Alex Lam S.L
cb62bd98d3
fix function inlining within loops (#2675) 
fixes #2663
 2017-12-28 02:53:14 +08:00
Alex Lam S.L
f30790b11b
fix dead_code on return assignments (#2668) 
fixes #2666
 2017-12-27 07:40:34 +08:00
Alex Lam S.L
5205dbcbf4
retain recursive function names (#2667) 
fixes #2665
 2017-12-27 07:00:12 +08:00
Alex Lam S.L
3ff625de7e
fix bugs on substituted AST_Defun (#2661) 
fixes #2660
 2017-12-27 05:31:37 +08:00
Alex Lam S.L
4832bc5d88
replace single-use recursive functions (#2659) 
fixes #2628
 2017-12-26 21:25:35 +08:00
Alex Lam S.L
7f342cb3e3
suppress inline within substituted AST_Scope (#2658) 
fixes #2657
 2017-12-26 18:56:59 +08:00
Alex Lam S.L
05e7d34ed4
improve unused over duplicate variable names (#2656) 2017-12-26 18:29:28 +08:00
Alex Lam S.L
0fe259e9c5
parse LF & comment correctly (#2653) 
fixes #2652
 2017-12-26 01:38:01 +08:00
Alex Lam S.L
1476c78b53
add html-minifier to benchmarks (#2646) 2017-12-25 03:07:46 +08:00
Alex Lam S.L
cb6a92892f
fix infinite loop during inline (#2645) 
fixes #2644
 2017-12-25 01:57:11 +08:00
Alex Lam S.L
efffb81735
fix comments output & improve /*@__PURE__*/ 
- fix whitespace around comments
- fix comment parsing around parentheses
- consider parentheses when parsing `/*@__PURE__*/`
- remove all `/*@__PURE__*/` on output

fixes #2638
 2017-12-24 12:38:45 +08:00
Alex Lam S.L
202f90ef8f
fix corner cases with collapse_vars, inline & reduce_vars (#2637) 
fixes #2630
 2017-12-24 01:24:12 +08:00
Alex Lam S.L
c07ea17c01
fix escape analysis on AST_PropAccess (#2636) 2017-12-24 00:36:46 +08:00
Alex Lam S.L
edb4e3bd52
make comments output more robust (#2633) 
- improve handling of comments right after `return`
- retain comments after `OutputStream`
- preserve trailing comments
- fix handling of new line before comments
- handle comments around parentheses

fixes #88
fixes #112
fixes #218
fixes #372
fixes #2629
 2017-12-22 04:59:54 +08:00
Alex Lam S.L
7ac7b0872f
remove AST hack from inline (#2627) 2017-12-20 17:05:53 +08:00
Alex Lam S.L
86ae5881b7
disable hoist_funs by default (#2626) 2017-12-20 17:05:40 +08:00
Alex Lam S.L
fac003c64f
avoid inline of function with special argument names (#2625) 2017-12-20 02:48:04 +08:00
Alex Lam S.L
2273655c17
fix inline after single-use reduce_vars (#2623) 2017-12-19 22:19:33 +08:00
Ondřej Španěl
01057cf76d Transform can be simplified when clone is not done. (#2621) 2017-12-19 17:56:16 +08:00
Alex Lam S.L
4b334edf49
handle global constant collision with local variable after inline (#2617) 
fixes #2616
 2017-12-19 03:05:30 +08:00
Alex Lam S.L
8ddcbc39e6
compress apply() & call() of function (#2613) 
- `fn.apply(a, [ ... ])` => `fn.call(a, ...)`
- `fn.call(a, ... )` => `a, fn(...)`

where `fn` can be `function` literal or symbol reference linked through `reduce_vars`
 2017-12-18 16:23:39 +08:00
Alex Lam S.L
0b0eac1d5d
drop property assignment to constants (#2612) 2017-12-18 12:07:53 +08:00
Alex Lam S.L
b29fc8b27c
improve transversal efficiency in collapse_vars (#2611) 
fixes #2603
 2017-12-18 03:00:05 +08:00
Alex Lam S.L
7918a50d52
improve reset_opt_flags() (#2610) 2017-12-17 23:01:08 +08:00
Alex Lam S.L
21794c9b8d
account for catch variable when inline (#2605) 
fixes #2604
 2017-12-16 15:21:09 +08:00
Alex Lam S.L
6c686ce593
fix nested inline (#2602) 
fixes #2601
 2017-12-16 02:16:35 +08:00
Alex Lam S.L
db902af4c6
fix escape analysis on || and && (#2600) 
fixes #2598
 2017-12-15 19:48:14 +08:00
Alex Lam S.L
7d6907cb99
fix dead_code on nested try (#2599) 
fixes #2597
 2017-12-15 19:41:28 +08:00
Alex Lam S.L
092d9affb8
fix reduce_vars on do...while (#2596) 2017-12-15 16:33:19 +08:00
Alex Lam S.L
8f681b1d17
handle inline of function arguments (#2590) 
fixes #2476
 2017-12-15 13:28:30 +08:00
Alex Lam S.L
90313875f7
inline single-use function across loop (#2594) 2017-12-14 19:24:54 +08:00
Alex Lam S.L
3f18a61532
fix reduce_vars on single AST_Defun reference across loop (#2593) 2017-12-14 18:47:05 +08:00
Alex Lam S.L
02a6ce07eb
improve reduce_vars (#2592) 
- account for hoisting nature of `var`
 2017-12-14 15:32:13 +08:00
Alex Lam S.L
738fd52bc4
improve collapse_vars (#2591) 
- handle single-use assignments other than `AST_VarDef`
- scan `AST_Call` for candidates
 2017-12-14 15:31:35 +08:00
Alex Lam S.L
8266993c6e
fix dead_code on return/throw within try (#2588) 2017-12-14 04:38:21 +08:00
Alex Lam S.L
9a137e8613
drop local assign-only variable in return (#2587) 2017-12-14 02:59:59 +08:00
Alex Lam S.L
ef618332ea
fold cascade functionality into collapse_vars (#2586) 2017-12-14 01:20:36 +08:00
Alex Lam S.L
7f418978c9
recover lost opportunities from #2574 (#2584) 2017-12-13 18:20:53 +08:00
Alex Lam S.L
04cc395c35
improve collapse_vars on side-effect-free replacements (#2583) 2017-12-13 04:52:54 +08:00
Alex Lam S.L
e008dc1bde
minor clean-up for IIFE (#2582) 
- faster exact type match
- aggressively convert to `!`
 2017-12-13 01:27:26 +08:00
Alex Lam S.L
ebfd5c5c74
fix AST_VarDef.may_throw() (#2580) 2017-12-12 03:30:25 +08:00
Alex Lam S.L
f2ad542679
fix collapse_vars on switch (#2578) 2017-12-11 18:11:09 +08:00
Alex Lam S.L
c43118be4f
remove unused code (#2579) 
fixes #2577
 2017-12-11 17:39:08 +08:00
Alex Lam S.L
93f3b2b114
escape consecutive unpaired surrogates (#2576) 
fixes #2569
 2017-12-11 01:15:44 +08:00
Alex Lam S.L
0e16d92786
handle exceptional flow correctly in collapse_vars (#2574) 
fixes #2571
 2017-12-11 00:16:02 +08:00
Alex Lam S.L
0aff037a35
improve unused on assign-only symbols (#2568) 2017-12-09 06:19:29 +08:00
Alex Lam S.L
74a2f53683
fix escape analysis for AST_Throw (#2564) 2017-12-08 02:54:37 +08:00
Alex Lam S.L
e20935c3f2
fix escape analysis for AST_Conditional & AST_Sequence (#2563) 
fixes #2560
 2017-12-08 01:50:38 +08:00
Alex Lam S.L
3e34f62a1c
account for side-effects in conditional call inversion (#2562) 
fixes #2560
 2017-12-08 01:15:31 +08:00
Alex Lam S.L
d21cb84696
eliminate noop calls more aggressively (#2559) 2017-12-07 01:22:08 +08:00
Alex Lam S.L
3dd495ecdd
improve if_return (#2558) 
`return void x()` => `x()`
 2017-12-07 01:01:52 +08:00
Alex Lam S.L
77332a0315
fix dead_code on for (#2552) 2017-12-02 15:46:05 +08:00
Alex Lam S.L
8da3754e51
improve evaluate on typeof (#2550) 
- gated through `typeofs`
 2017-12-02 02:18:33 +08:00
Alex Lam S.L
9a6b11f8e6
improve boolean compression (#2548) 
fixes #2535
 2017-12-01 22:41:35 +08:00
Alex Lam S.L
7ac6fdcc99
improve switch case compression (#2547) 2017-12-01 14:32:00 +08:00
Alex Lam S.L
f6610baaa8
improve AST_For.init & AST_Switch.expression compression (#2546) 2017-12-01 12:53:59 +08:00
Alex Lam S.L
09b320e8a5
convert to number under boolean context (#2545) 2017-12-01 12:52:36 +08:00
Alex Lam S.L
5a1e99d713
improve compression of if conditions (#2544) 2017-12-01 06:18:31 +08:00
Alex Lam S.L
b762f2d6f4
improve compression of loop conditions (#2543) 2017-12-01 05:52:33 +08:00
Alex Lam S.L
172079a47f
improve code reuse (#2542) 2017-12-01 03:40:46 +08:00
Alex Lam S.L
c58d3936a3
fix corner case in call binding (#2541) 2017-12-01 03:18:20 +08:00
Alex Lam S.L
bc5047c1e7
fix inline on nested substitutions (#2533) 
fixes #2531
 2017-11-29 13:31:41 +08:00
Alex Lam S.L
206a54a746
fix nested hoist_props substitution (#2523) 
fixes #2519
 2017-11-28 14:39:00 +08:00
Alex Lam S.L
32def5ebf5
improve synergy between collapse_vars & unused (#2521) 2017-11-28 14:02:39 +08:00
Alex Lam S.L
ecc9f6b770
drop assignment in AST_VarDef.value (#2522) 
fixes #2516
 2017-11-28 13:08:40 +08:00
Alex Lam S.L
c141ae6f8d
fix argument/atom collision by properties (#2514) 
fixes #2513
 2017-11-25 22:52:46 +08:00
Alex Lam S.L
3b28b915eb
extend escape analysis on constant expression properties (#2509) 
fixes #2508
 2017-11-24 14:07:39 +08:00
Alex Lam S.L
eb001dc1d9
fix argument/atom collision by collapse_vars (#2507) 
fixes #2506
 2017-11-24 07:26:22 +08:00
Alex Lam S.L
aa9bdf416e
make AST_Lambda.contains_this() less magical (#2505) 2017-11-24 07:03:37 +08:00
Alex Lam S.L
8987780db6
eliminate invalid state caching in collapse_vars (#2502) 
fixes #2497
 2017-11-24 04:12:37 +08:00
Alex Lam S.L
30cfea2e7a
fix rename (#2501) 
- suppress spurious `rename` from `commander`
- handle `AST_SymbolCatch` correctly
 2017-11-24 03:05:43 +08:00
Alex Lam S.L
f4e2fb9864
expand symbol space to improve compression (#2460) 
- give globally distinct names to distinct variables
- improve ability to compress cross-scoped
- introduce `options.rename` to `minify()`
- default `true` if both `compress` & `mangle`
 2017-11-19 19:29:51 +08:00
Alex Lam S.L
b80062c490
enable hoist_props by default (#2492) 2017-11-19 14:56:23 +08:00
Alex Lam S.L
ae28a24c7f
fix cross-scope inlining of AST_Functions (#2486) 
fixes #2485
 2017-11-16 10:04:30 +08:00
Alex Lam S.L
ebe761cad0
minor consolidations (#2484) 
- unique symbol generation
- `unsafe` on `AST_Call`
 2017-11-16 04:37:37 +08:00
Alex Lam S.L
49fbe9c5ac
fix replacement logic in collapse_vars (#2475) 2017-11-13 07:37:42 +08:00
Alex Lam S.L
2ac5086831
fix top_retain on hoist_props (#2474) 
fixes #2473
 2017-11-13 00:59:41 +08:00
Alex Lam S.L
c6cfa04d10
allow symbol replacement on multiple occurrences (#2472) 
- all-or-nothing replacement
- avoid unmangleable names

fixes #2436
 2017-11-12 22:31:47 +08:00
Alex Lam S.L
cda27b0970
extend reduce_funcs to cover cross-scope substitutions (#2469) 
fixes #2468
 2017-11-11 15:30:17 +08:00
Alex Lam S.L
3c74047368
implement compress option reduce_funcs (#2466) 
- inline single-use function declarations as expressions when permissible
- depend on `reduce_vars`
- enabled by default
- disable for speed critical code

fixes #2464
 2017-11-11 05:59:35 +08:00
Alex Lam S.L
94525d859f
fix object literal tracing in reduce_vars (#2461) 2017-11-10 05:47:10 +08:00
Alex Lam S.L
1127a2caf3
fix multiple nested function substitutions (#2458) 
fixes #2449
 2017-11-09 23:30:00 +08:00
Alex Lam S.L
246d9d4e83
remove hack in collapse_vars (#2457) 
fixes #2456
 2017-11-09 20:00:58 +08:00
Alex Lam S.L
4c0b0177b6
preserve function identity in reduce_vars (#2451) 
fixes #2450
 2017-11-08 03:28:46 +08:00
Alex Lam S.L
bbedbf4ea0
handle circular function reference gracefully (#2446) 
fixes #2442
 2017-11-07 02:37:23 +08:00
Alex Lam S.L
2cfb5aa7da
account for eval & with in reduce_vars (#2441) 
fixes #2440
 2017-11-06 16:10:57 +08:00
Alex Lam S.L
6c45101870
consolidate & enhance unused (#2439) 
- defer declaration removal in `collapse_vars`
- account for `AST_SymbolFunarg` in deduplication
- private accounting for `collapse_vars`
- avoid issues with identity reference due to deep cloning

fixes #2437
 2017-11-06 14:25:10 +08:00
Alex Lam S.L
2c2fd89e34
inline single-use functions that are not constant expressions (#2434) 
fixes #2428
 2017-11-05 22:14:11 +08:00
Alex Lam S.L
5b4b07e9a7
extend function inlining safety checks (#2430) 2017-11-05 06:18:45 +08:00
Alex Lam S.L
a8aa28a7a6
consolidate single-use function reduction (#2427) 
fixes #2423
 2017-11-05 04:27:01 +08:00
Alex Lam S.L
fe5a68f9d5
maintain call argument order in collapse_vars (#2426) 
fixes #2425
 2017-11-05 00:00:18 +08:00
Alex Lam S.L
c8b6f4733d
reduce this within functions (#2421) 
- only replace same-scope usages
- augment `test/ufuzz.js` to test for `this`


fixes #2420
 2017-11-04 00:31:37 +08:00
Alex Lam S.L
a48f87abf2
compress new function containing this (#2417) 2017-10-30 23:19:27 +08:00
Alex Lam S.L
8428326ea1
enhance properties (#2412) 
- trim array items only if `side_effects`
- extend to non-identifier properties
 2017-10-29 04:11:26 +08:00
Alex Lam S.L
31f8209193 remove dead code (#2405) 2017-10-27 14:28:09 +08:00
Alex Lam S.L
9b0f86f5a1 fix reduce_vars on AST_Array.length (#2404) 2017-10-27 02:33:37 +08:00
Alex Lam S.L
ee082ace1b compress self comparisons (#2398) 2017-10-26 01:16:12 +08:00
Alex Lam S.L
4178289c38 implement hoist_props (#2396) 
fixes #2377
 2017-10-25 03:38:11 +08:00
Alex Lam S.L
74ae16f9f8 fix unsafe reduce_vars on arrays & objects (#2397) 2017-10-24 22:10:36 +08:00
Alex Lam S.L
86ea38a259 enhance unsafe evaluate of arrays & objects (#2394) 2017-10-24 02:58:30 +08:00
Alex Lam S.L
8a713e449f deduplicate declarations regardless of toplevel (#2393) 2017-10-23 01:00:50 +08:00
Alex Lam S.L
24aa07855b safer properties transform (#2391) 
`{ a: x, b: y }.a` => `[ x, y ][0]`
- `x` cannot be function containing `this`

`[ x, y, z ][1]` => `(x, z, y)`
- only if `z` is side-effect-free
 2017-10-22 20:10:13 +08:00
Alex Lam S.L
5fd723f143 fix unsafe expansion of object literals (#2390) 2017-10-22 15:00:36 +08:00
Alex Lam S.L
516eaef50c fix unsafe evaluation of AST_Sub (#2389) 2017-10-22 13:14:15 +08:00
Alex Lam S.L
4ae1fb3ed8 fix unsafe evaluation of objects (#2388) 2017-10-22 04:19:40 +08:00
Alex Lam S.L
011123223b fix unsafe escape analysis in reduce_vars (#2387) 2017-10-22 03:23:31 +08:00
Alex Lam S.L
c927cea632 unsafe fix-ups for #2351 (#2379) 2017-10-21 04:08:26 +08:00
Alex Lam S.L
0f2ef3367c enhance collapse_vars around lazy operations (#2369) 2017-10-19 04:52:00 +08:00
Alex Lam S.L
7e5b5cac97 fix AST_PropAccess in collapse_vars (take 3) (#2375) 
Suppress scanning beyond assignment to `a.b`
 2017-10-18 02:54:51 +08:00
Alex Lam S.L
c1346e06b7 clean up lazy operator detection (#2373) 2017-10-17 23:25:45 +08:00
Alex Lam S.L
0d2fe8e3ef fix AST_PropAccess in collapse_vars (take 2) (#2372) 
fixes #2364
 2017-10-17 22:59:15 +08:00
Alex Lam S.L
f2b9c11e2a fix AST_PropAccess in collapse_vars (#2370) 
fixes #2364
 2017-10-17 18:33:03 +08:00
Alex Lam S.L
fe647b083e account for side-effects from AST_This in collapse_vars (#2365) 2017-10-17 01:18:55 +08:00
Alex Lam S.L
b810e2f8da perform reduce_vars on safe literals (#2351) 
- constant expression
- single reference
- same scope
- not across loop body
 2017-10-09 12:25:06 +08:00
Alex Lam S.L
1abe14296e collapse a.b whenever safe (#2350) 2017-10-08 13:17:48 +08:00
Alex Lam S.L
dd71639264 enhance reduce_vars for AST_Accessor (#2339) 
fixes #2336
 2017-10-01 03:01:50 +08:00
Alex Lam S.L
2dcc552ce0 trap invalid use of reserved words (#2338) 
fixes #2337
 2017-10-01 02:10:41 +08:00
kzc
7e3e9da860 fix "use asm" numeric output (#2328) 
fixes #2324
 2017-09-21 04:42:40 +08:00
Alex Lam S.L
00f509405b suppress collapse_vars of this into "use strict" (#2326) 
fixes #2319
 2017-09-20 05:23:20 +08:00
Alex Lam S.L
4f0953f7e9 handle LHS side-effects on cascade & collapse_vars (#2314) 
fixes #2313
 2017-09-16 11:45:19 +08:00
Alex Lam S.L
182a47bfb1 improve source mapping (#2312) 
fixes #2310
 2017-09-15 12:46:48 +08:00
Mateusz Burzyński
8158b1bdcf Testing all leading comments against being PURE comments (#2305) 2017-09-10 02:08:15 +08:00
Alex Lam S.L
aacf3edc68 extend unsafe on pure global functions (#2303) 2017-09-07 22:08:34 +08:00
kzc
8b89072190 add Date and other known globals to unsafe compress option (#2302) 2017-09-07 02:44:26 +08:00
Alex Lam S.L
395a17ccda fix collapse_vars on default function argument (#2299) 
Avoid collision with local variable `undefined` under certain corner cases.

fixes #2298
 2017-09-04 02:32:33 +08:00
Alex Lam S.L
3f355866cf correctly count declarations after hoist_vars (#2297) 
fixes #2295
 2017-09-03 17:23:31 +08:00
Alex Lam S.L
e5cf7972ea fix unused patching of AST_For.init blocks (#2289) 
fixes #2288
 2017-08-29 01:10:04 +08:00
Erik Desjardins
16d40915b4 don't escape null characters as \0 when followed by any digit (#2273) 
fixes #2272
 2017-08-14 12:30:08 +08:00
Alex Lam S.L
e7c21e87e3 fix ie8 mangling of top-level AST_SymbolCatch (#2263) 
fixes #2254
 2017-08-01 02:38:32 +08:00
Alex Lam S.L
a845897758 improve mangle.properties (#2261) 
- include dead code when `keep_quoted`
- unify `keep_quoted` & `reserved`
- make `test/run-tests.js` consistent with `minify()`

fixes #2256
 2017-07-29 23:02:04 +08:00
Alex Lam S.L
6a5e74b44e unescape surrogate pairs only (#2246) 
fixes #2242
 2017-07-23 12:38:21 +08:00
Alex Lam S.L
b35dfc2599 reject malformed CLI parameters (#2239) 
fixes #2237
 2017-07-15 23:50:27 +08:00
Alex Lam S.L
9e1da9235e ensure ie8 works with mangled properties (#2238) 
fixes #2234
 2017-07-15 22:50:59 +08:00
Alex Lam S.L
a5ffe2c23f drop unused builtin globals under unsafe (#2236) 
fixes #2233
 2017-07-15 15:16:11 +08:00
Alex Lam S.L
9282e7b0c6 fix unsafe evaluate of Object static methods (#2232) 
fixes #2231
 2017-07-14 19:52:01 +08:00
Alex Lam S.L
5229cb2b1b drop unused compound assignments (#2230) 
fixes #2226
 2017-07-14 00:39:34 +08:00
Alex Lam S.L
458e3e15f0 enhance passes (#2229) 
- remove hardcoded upper limit
- continue based on node count reduction
- emit verbose statistics

fixes #2226
 2017-07-13 02:18:59 +08:00
Alex Lam S.L
10a938cb79 enhance source mapping on IIFEs (#2224) 
fixes #2213
 2017-07-11 02:34:28 +08:00
Alex Lam S.L
71ee91e716 handle duplicate argument names in collapse_vars (#2215) 2017-07-08 04:42:35 +08:00
Alex Lam S.L
4f70d2e28c inlining of static methods & constants (#2211) 
- guard by `unsafe`
- support `Array`, `Math`, `Number`, `Object` & `String`

fixes #2207
 2017-07-07 05:35:32 +08:00
Alex Lam S.L
4b6ca5e742 inline property access of object literal (#2209) 
- only if property value is side-effect-free
- guard by `unsafe`

fixes #2208
 2017-07-06 21:51:58 +08:00
Alex Lam S.L
9306da3c58 suppress collapse_vars of this as call argument (#2204) 
fixes #2203
 2017-07-06 01:03:52 +08:00
Alex Lam S.L
1ac25fc032 improve compress granularity through typeofs (#2201) 
fixes #2198
 2017-07-05 19:20:33 +08:00
Alex Lam S.L
5f046c724b minor clean-ups to evaluate (#2197) 2017-07-03 18:52:39 +08:00
Alex Lam S.L
af0262b7e5 improve parenthesis emission (#2196) 
- eliminate `throw` usages
- suppress extraneous parenthesis
  - `new function() {foo.bar()}.baz`
  - `for (function() { "foo" in bar; };;);`
 2017-07-03 04:17:37 +08:00
Alex Lam S.L
6b3aeff1d8 clean up TreeWalker.pop() (#2195) 
Remove superfluous parameter.
 2017-07-03 03:23:38 +08:00
Alex Lam S.L
20e4f8277f refactor throw usage within compress (#2193) 
Eliminate exceptional constructs from normal control flow.
 2017-07-03 02:10:56 +08:00
Alex Lam S.L
8b69a3d18e drop argument value after collapse_vars (#2190) 2017-07-02 04:28:11 +08:00
Alex Lam S.L
d40950b741 improve inline efficiency (#2188) 
... by teaching `collapse_vars` some new tricks.

fixes #2187
 2017-07-02 01:05:14 +08:00
Alex Lam S.L
bdeadffbf5 improve usability of name cache under minify() (#2176) 
fixes #2174
 2017-06-29 12:48:34 +08:00
Alex Lam S.L
f0a99125ee improve unsafe_Func (#2171) 
- minimise disturbance to `compute_char_frequency()`
- remove extraneous quotation marks
 2017-06-27 23:53:42 +08:00
Alex Lam S.L
1e4de2e6d3 parse @global_defs as expressions (#2169) 
- let parser rejects non-conformant input
- eliminate need for extraneous parenthesis
 2017-06-27 10:31:19 +08:00
Alex Lam S.L
9db4c42380 fix cascade & collapse on property access of constants (#2158) 2017-06-24 21:30:06 +08:00
Alex Lam S.L
94e5e00c03 refactor compute_char_frequency() (#2152) 
- minimise maintenance when updating AST
- maximise code sharing between `master` & `harmony`
 2017-06-23 20:05:31 +08:00
Alex Lam S.L
dc6bcaa18e synchronise mangle.properties for minify() & test/compress (#2151) 2017-06-23 15:53:13 +08:00
Alex Lam S.L
d58b184835 refactor Compressor.toplevel (#2149) 2017-06-23 13:11:40 +08:00
Alex Lam S.L
b3a57ff019 minimise reduce_vars cloning overhead (#2148) 2017-06-23 06:59:53 +08:00
Alex Lam S.L
3d5bc08185 fix reduce_vars on this (#2145) 
fixes #2140
 2017-06-23 04:44:57 +08:00
Alex Lam S.L
0692435f01 fix for-in loop parsing (#2144) 2017-06-23 04:14:30 +08:00
Alex Lam S.L
343ea326c2 ensure mangling works if catch reuses a scope variable (#2123) 
fixes #2120
 2017-06-20 02:14:05 +08:00
Alex Lam S.L
0a0f4f5591 make defensive copies when inline (#2116) 
fixes #2114
 2017-06-17 14:32:37 +08:00
Alex Lam S.L
931daa85bf fix loss of context in collapse_vars & cascade (#2112) 
fixes #2110
 2017-06-16 21:18:43 +08:00
Alex Lam S.L
00e4f7b3c1 in-place tigten_body() (#2111) 
By reducing copies of `AST_Node` arrays, we should be able to reduce:
- memory pressure
- potential bugs caused by multiple references in AST
- duplicated executions of `OPT()`
 2017-06-16 19:19:54 +08:00
Alex Lam S.L
11e63bc335 correctly determine scope of AST_This (#2109) 
fixes #2107
 2017-06-16 14:54:46 +08:00
Alex Lam S.L
33405bb24b enforce inline scope restriction (#2106) 
fixes #2105
 2017-06-16 03:21:38 +08:00
Alex Lam S.L
b85a358deb suppress inline of this (#2103) 
fixes #2101
 2017-06-15 12:14:16 +08:00
Alex Lam S.L
3f961bbba0 compute uses_arguments correctly in figure_out_scope() (#2099) 
fixes #2097
 2017-06-15 03:28:26 +08:00
Alex Lam S.L
2bdc8802dd fix variable accounting in inline (#2085) 
fixes #2084
 2017-06-13 01:40:14 +08:00
Alex Lam S.L
293c566d6c marshal mangle[.properties].reserved from non-Array values (#2072) 2017-06-09 04:29:12 +08:00
Alex Lam S.L
9c306406f1 fix iteration over object with inherited properties (#2068) 
fixes #2055
 2017-06-08 03:27:03 +08:00
Alex Lam S.L
9db0695b10 fix cascade on multi-branch evaluations (#2067) 
Partially reverts #2059 as this has better coverage and performance.

fixes #2062
 2017-06-07 19:52:01 +08:00
Alex Lam S.L
b9ad53d1ab fix inline handling of AST_Call.args (#2059) 2017-06-06 22:55:25 +08:00
Alex Lam S.L
3493a182b2 implement function inlining (#2053) 
- empty body
- single `AST_Return`
- single `AST_SimpleStatement`
- avoid `/*#__PURE__*/`

Miscellaneous
- enhance single-use function substitution

fixes #281
 2017-06-06 05:49:53 +08:00
Alex Lam S.L
27c5284d3d workaround webkit parsing error (#2056) 
apply `webkit` to jetstream tests
 2017-06-06 04:06:42 +08:00
Alex Lam S.L
540220b91b fix AST_Function scope invariance (#2052) 
improve function name hack in `run_code()`
 2017-06-04 19:27:43 +08:00
Alex Lam S.L
1743621889 clean up lib/parse.js (#2047) 
- remove unused definitions
- replace `array_to_hash()`
 2017-06-03 14:00:59 +08:00
Alex Lam S.L
bac14ba881 fix non-identifier getter/setter name (#2041) 
fixes #2040
 2017-06-01 18:11:16 +08:00
Alex Lam S.L
ec095ed647 whitelist unsafe evaluate candidates (#2039) 
- all arguments may accept constant values
- return constant value
- free of side effects
- available & identical across locales and runtime environments
 2017-06-01 04:33:05 +08:00
Alex Lam S.L
17e73121fa enhance unsafe evaluate (#2037) 2017-06-01 00:56:28 +08:00
Alex Lam S.L
e9645e017f introduce unsafe_Func (#2033) 
Separate flag for #203 functionality.
 2017-05-31 03:38:00 +08:00
Alex Lam S.L
1aa38051fb better fix for #512 & #2010 (#2019) 
- remove duplicated functionalities
- fix similar issue with `else`
 2017-05-29 10:51:41 +08:00
Alex Lam S.L
c6c9f4f5a8 implement --help options (#2017) 2017-05-28 18:21:44 +08:00
Alex Lam S.L
7b13159cda fix hoist_funs on block-scoped function under "use strict" (#2013) 
Technically not part of ES5, but commonly used code exists in the wild.
 2017-05-27 17:44:59 +08:00
Alex Lam S.L
95094b9c22 fix if_return on AST_Defun (#2010) 
Previous fiix for #1052 perturbs declaration order of functions which leads to incorrect behaviour under "use strict".
 2017-05-27 13:41:49 +08:00
Alex Lam S.L
dc33facfcb fix dead_code on block-scoped function under "use strict" (#2006) 
Technically not part of ES5, but commonly used code exists in the wild.
 2017-05-26 16:08:51 +08:00
Alex Lam S.L
c70fb60384 clean up lib/scope.js (#2003) 
fixes #2004
 2017-05-26 03:58:35 +08:00
Alex Lam S.L
793d61499b report timing breakdown (#2000) 
fix corner cases with `sourceMap`

fixes #1998
 2017-05-25 07:15:55 +08:00
Alex Lam S.L
e667f0acb8 fix source map offset (#1993) 
Account for whitespace insertions.

fixes #505
fixes #890
 2017-05-23 20:25:48 +08:00
Alex Lam S.L
efdb65913b improve usability of global_defs in minify() (#1987) 
Use `@key` to `parse()` string value as `AST_Node`.

fixes #1986
 2017-05-22 01:38:43 +08:00
Alex Lam S.L
58fae7dc07 enhance if_return to handle return void... (#1977) 
fixes #512
 2017-05-20 15:58:46 +08:00
Alex Lam S.L
eae26756f1 introduce unsafe_regexp (#1970) 
fixes #1964
 2017-05-19 09:06:29 +08:00
Alex Lam S.L
569c21e952 improve RegExp handling (#1959) 
- remove `options.output.unescape_regexps`
- preserve original pattern whenever possible

fixes #54
fixes #1929
 2017-05-17 20:10:50 +08:00
Alex Lam S.L
87c3a2c0ce remove space_colon (#1960) 
Always emit space after colon when `options.output.beautify` is enabled.
 2017-05-17 14:07:34 +08:00
Alex Lam S.L
9464d3c20f fix parsing of property access after new line (#1944) 
Account for comments when detecting property access in `tokenizer`.

fixes #1943
 2017-05-16 05:40:49 +08:00
Alex Lam S.L
265008c948 improve keyword-related parser errors (#1941) 
fixes #1937
 2017-05-15 23:02:55 +08:00
Alex Lam S.L
e005099fb1 fix & improve coverage of estree (#1935) 
- fix `estree` conversion of getter/setter
- fix non-directive literal in `to_mozilla_ast()`
- revamp `test/mozilla-ast.js`
  - reuse `test/ufuzz.js` for code generation
  - use `acorn.parse()` for creating `estree`
- extend `test/ufuzz.js` for `acorn` workaround
  - catch variable redefinition
  - non-trivial literal as directive
  - adjust options for tolerance

Miscellaneous
- optional semi-colon when parsing directives

fixes #1914
closes #1915
 2017-05-15 02:37:53 +08:00
Alex Lam S.L
3ca902258c fix bugs with getter/setter (#1926) 
- `reduce_vars`
- `side_effects`
- property access for object
- `AST_SymbolAccessor` as key names

enhance `test/ufuzz.js`
- add object getter & setter
  - property assignment to setter
  - avoid infinite recursion in setter
- fix & adjust assignment operators
  - 50% `=`
  - 25% `+=`
  - 2.5% each for the rest
- avoid "Invalid array length"
- fix `console.log()`
  - bypass getter
  - curb recursive reference
- deprecate `-E`, always report runtime errors
 2017-05-14 02:10:34 +08:00
Alex Lam S.L
c391576d52 remove support for const (#1910) 
As this is not part of ES5.
 2017-05-12 14:57:41 +08:00
Alex Lam S.L
ac73c5d421 avoid arguments and eval in reduce_vars (#1924) 
fixes #1922
 2017-05-12 12:34:55 +08:00
Alex Lam S.L
1d407e761e fix invalid transform on const (#1919) 
- preserve (re)assignment to `const` for runtime error
- suppress `cascade` on `const`, as runtime behaviour is ill-defined
 2017-05-12 04:51:44 +08:00
Alex Lam S.L
a3b2eb75bd return Error from minify() (#1880) 
Have `minify()` return `Error` in `result.error` rather than throwing it.
 2017-05-08 07:05:19 +08:00
Alex Lam S.L
da295de82b support dumping AST (#1879) 
Re-order `AST_Binary` properties to make dump more readable.

closes #769
 2017-05-08 06:23:01 +08:00
Alex Lam S.L
e54748365c support minify() output as AST (#1878) 
- `options.output.ast` (default `false`)
- `options.output.code` (default `true`)
 2017-05-08 02:11:45 +08:00
Alex Lam S.L
2c7ee956fd fix unsafe on evaluate of reduce_vars (#1870) 
Determine if variables with non-constant values can escape and be modified.

fixes #1865
 2017-05-06 23:18:55 +08:00
Alex Lam S.L
ecf3563c45 kill opera (#1869) 2017-05-06 17:42:07 +08:00
Alex Lam S.L
dee5a27516 enhance collapse_vars (#1862) 
- extend expression types
  - `a++`
  - `a=x;`
- extend scan range
  - `for(init;;);`
  - `switch(expr){case expr:}`
  - `a = x; a = a || y;`
- terminate upon `debugger;`

closes #1821
fixes #27
fixes #315
fixes #1858
 2017-05-06 16:15:43 +08:00
Alex Lam S.L
5a25d24b56 rename variables for better readability (#1863) 2017-05-02 20:47:10 +08:00
kzc
ea9289771b improve literal return optimization (#1860) 2017-05-02 00:10:11 +08:00
Alex Lam S.L
2cb55b2ad0 enforce toplevel on other compress options (#1855) 
Respect "funcs" and "vars" properly.

fixes #1850
 2017-04-30 22:52:36 +08:00
Alex Lam S.L
9e62628171 fix unused on for-in statements (#1843) 
Only need to avoid `var` within the initialisation block.

fixes #1841
 2017-04-24 03:14:01 +08:00
Alex Lam S.L
9bf72cf758 improve parser under "use strict" (#1836) 
- `const` without value
- `delete` of expression
- redefining `arguments` or `eval`

extend `test/ufuzz.js`
- optionally generate "use strict"
- improve handling of test cases with syntax errors
- group IIFE generation
- generate bare anonymous functions
- workaround `console.log()` for `new function()`
- generate expressions with `this`


fixes #1810
 2017-04-23 20:05:22 +08:00
Alex Lam S.L
45ce369480 fix AST_For.init patch-up in drop_unused() (#1839) 
fixes #1838
 2017-04-23 01:51:56 +08:00
Alex Lam S.L
ca32a09032 fix label-related bugs (#1835) 
- deep cloning of `AST_LabeledStatement`
- `L:do{...}while(false)`
- empty statement with label within block

extend `test/ufuzz.js`
- generate labels for blocks & loops
- generate for-in statements
- skip suspicious option search if `minify()` errs


fixes #1833
 2017-04-22 22:15:04 +08:00
Alex Lam S.L
f05d4f7af3 improve unused (#1832) 
- extract leading value with side-effects out of `var` statement
- reduce scanning of `AST_Definitions` from 3 passes to just once
 2017-04-20 13:06:14 +08:00
Alex Lam S.L
88e7a542cd fix unused on labeled for-loop (#1831) 
fixes #1830
 2017-04-20 04:18:38 +08:00
Alex Lam S.L
4dcff038cb improve collapse_vars on AST_Var (#1828) 
Perform the same cascaded scanning within `var` statement as we do on array of statements.
 2017-04-19 04:49:09 +08:00
Alex Lam S.L
b4b9305db0 fix parser bugs & CLI reporting (#1827) 
fixes #1825
 2017-04-19 04:27:13 +08:00
Alex Lam S.L
28cfb65c47 extend cascade into a.b (#1829) 
fixes #27
 2017-04-19 04:17:15 +08:00
Alex Lam S.L
0f4f01b66c clean up collapse_vars (#1826) 
- remove overlap in functionality of singular, consecutive reference of constant value
- remove workarounds for previous bugs in `lib/scope.js`
- distribute recursive `collapse_single_use_vars()` calls to their respective `OPT(AST_Node)`
- enable collapsing of variables within a single `AST_Definitions`
 2017-04-18 21:45:34 +08:00
Alex Lam S.L
5d9f1da3ab support safe reassignments in reduce_vars (#1823) 
`var a=1;a=2;x(a)` => `x(2)`

fix pre-existing issues
- reference counting on assignment
- walking of anonymous functions
- chained assignment
 2017-04-18 13:38:42 +08:00
Alex Lam S.L
d1aa09c5c7 fix reduce_vars on conditionals (#1822) 2017-04-18 01:44:23 +08:00
Alex Lam S.L
6d5f341999 fix reduce_vars on boolean binary expressions (#1819) 
Side effects of `&&` and `||` have not mattered until #1814, which takes assignment expressions into account.
 2017-04-17 17:24:29 +08:00
Alex Lam S.L
4ffb6fce76 compress duplicated variable definitions (#1817) 
These are surprisingly common, as people reuse the same variable name within loops or switch branches.
 2017-04-17 17:11:29 +08:00
Alex Lam S.L
71a8d0d236 fix reduce_vars within try-block (#1818) 
Possible partial execution due to exceptions.
 2017-04-17 14:03:29 +08:00
Alex Lam S.L
1a498db2d3 enhance reduce_vars (#1814) 
- allow immediate assignment after declaration of variable
- relax modification rule for immutable value
- fix order of visit for TreeWalker
- remove extraneous code
 2017-04-17 01:36:50 +08:00
Alex Lam S.L
44dfa5a318 fix variable substitution (#1816) 
- let `collapse_vars` take care of value containing any symbols
- improve overhead accounting
 2017-04-16 17:25:39 +08:00
Alex Lam S.L
ec443e422c unify CLI & API under minify() (#1811) 
- rename `screw_ie8` to `ie8`
- rename `mangle.except` to `mangle.reserved`
- rename `mangle.properties.ignore_quoted` to `mangle.properties.keep_quoted` 
- compact `sourceMap` options
- more stringent verification on input `options`
- toplevel shorthands
  - `ie8`
  - `keep_fnames`
  - `toplevel`
  - `warnings`
- support arrays and unquoted string values on CLI
- drop `fromString` from `minify()`
  - `minify()` no longer handles any `fs` operations
- unify order of operations for `mangle_properties()` on CLI & API
  - `bin/uglifyjs` used to `mangle_properties()` before even `Compressor`
  - `minify()` used to `mangle_properties()` after `Compressor` but before `mangle_names()`
  - both will now do `Compressor`, `mangle_names()` then `mangle_properties()`
- `options.parse` / `--parse` for parser options beyond `bare_returns`
- add `mangle.properties.builtins` to disable built-in reserved list
  - disable with `--mangle-props builtins` on CLI
- `warnings` now off by default
- add `--warn` and `--verbose` on CLI
- drop `--enclose`
- drop `--export-all`
- drop `--reserved-file`
  - use `--mangle reserved` instead
- drop `--reserve-domprops`
  - enabled by default, disable with `--mangle-props domprops`
- drop `--prefix`
  - use `--source-map base` instead
- drop `--lint`
- remove `bin/extract-props.js`
- limit exposure of internal APIs
- update documentations

closes #96
closes #102
closes #136
closes #166
closes #243
closes #254
closes #261
closes #311
closes #700
closes #748
closes #912
closes #1072
closes #1366
fixes #101
fixes #123
fixes #124
fixes #263
fixes #379
fixes #419
fixes #423
fixes #461
fixes #465
fixes #576
fixes #737
fixes #772
fixes #958
fixes #1036
fixes #1142
fixes #1175
fixes #1220
fixes #1223
fixes #1280
fixes #1359
fixes #1368
 2017-04-15 23:50:50 +08:00
Alex Lam S.L
32deb365d5 drop angular (#1812) 
Remove support for `@ngInject` as there are proper alternatives anyway.
 2017-04-15 05:52:29 +08:00
Alex Lam S.L
2244743545 convert AST_Seq from binary tree to array (#1460) 
- rename `AST_Seq` to `AST_Sequence`
- raise default sequences_limit from 200 to 800
 2017-04-12 21:56:27 +08:00
Alex Lam S.L
d6fbc365e2 fix LHS cases for NaN & friends (#1804) 
`Infinity = beyond` should not become `1/0 = beyond`
 2017-04-09 03:18:14 +08:00
Alex Lam S.L
0479ff0c54 fix a couple of bugs in global_defs (#1802) 
- `optimize()` substituted expression
- compute nested property string correctly

fixes #1801

Miscellaneous
- reset optimisation flags on all node types
 2017-04-08 16:46:25 +08:00
Alex Lam S.L
cf72fe552f fix delete corner cases (#1799) 
- assignment
- boolean
- conditional
- sequence
 2017-04-08 14:25:28 +08:00
Alex Lam S.L
c2a1bceb77 fix pure_getters for chained property access (#1798) 2017-04-07 17:06:01 +08:00
Alex Lam S.L
e3c9c22c75 fix corner cases with delete (#1796) 
`delete Infinity` returns `false` where as `delete (1/0)` returns `true`
 2017-04-07 15:39:59 +08:00
Alex Lam S.L
0f4cd73dcc introduce "strict" to pure_getters (#1795) 2017-04-07 13:31:58 +08:00
Alex Lam S.L
281e882d27 fix reduce_vars on catch variable (#1794) 
Improved catch handling in `figure_out_scope()` means special case treatment of IE8 is no longer valid in `reset_opt_flags()`.

Also fixed recursive assignment in variable definition.
 2017-04-07 12:32:56 +08:00
Alex Lam S.L
cc6aa3e5ac fix incorrect context in variable substitution (#1791) 
`AST_Node.optimize()` is context-aware, so don't cache its results to be used elsewhere.

Also fixed a few cases of AST corruption and beef up safety of `pure_getters`.
 2017-04-07 03:42:17 +08:00
Alex Lam S.L
e869779a98 enable inline_script by default (#1793) 2017-04-07 00:45:51 +08:00
Alex Lam S.L
06cdb74279 improve pure_getters (#1786) 
- property access to `null` & `undefined` always has side effects
- utilise `reduce_vars` to determine safe property access
- may-be cases treated as side effects unless `unsafe`
 2017-04-06 11:18:59 +08:00
Alex Lam S.L
ff289b90a9 implement delayed resolution for reduce_vars (#1788) 
Although it would be nice to enforce `AST_Node` cloning during transformation, that ship has sailed a long time ago.

We now get the assigned value when resolving `AST_SymbolRef` instead of `reset_opt_flags()`, which has the added advantage of improved compressor efficiency.

fixes #1787
 2017-04-05 21:06:42 +08:00
Alex Lam S.L
9b6bc67c33 optimise do{...}while(false) (#1785) 
- better heuristics to avoid issues like #1532
- fix `TreeWalker.loopcontrol_target()`
  - `continue` cannot refer to `switch` blocks
 2017-04-04 23:48:22 +08:00
Alex Lam S.L
951770fc68 exclude mangling of special property names (#1779) 
- `null`
- `true`
- `false`
- numeric literals
 2017-04-04 03:50:19 +08:00
Alex Lam S.L
48b3fe9952 fix mangleProperties on identifiers (#1776) 
- fix handling of "-Infinity"
- add test case for "-0"

reverts #1481
 2017-04-03 23:17:47 +08:00
Alex Lam S.L
59a4e56bc8 fix mangleProperties of undefined & Infinity (#1772) 
`NaN` already works by the happy accident of `Number.NaN`

fixes #1770
 2017-04-03 12:31:05 +08:00
Alex Lam S.L
9469c03ac9 fix corner case in switch (#1765) 2017-04-02 17:07:20 +08:00
Alex Lam S.L
d57527697f avoid confusion of NaN & Infinity with catch symbol of the same name (#1763) 
fixes #1760
fixes #1761
 2017-04-02 16:14:09 +08:00
Alex Lam S.L
f7ca4f2297 fix corner cases in switch and undefined (#1762) 
- fix side effects in switch condition for singular blocks
- fix `undefined` confusion with local variable
- gate `OPT(AST_Switch)` with `switches`

fixes #1758
fixes #1759
 2017-04-02 14:52:25 +08:00
Alex Lam S.L
ee3fe0f4cd fix switch branch elimination (#1752) 
Merge unreachable case body with previous fallthrough case

fixes #1750
 2017-04-01 17:19:57 +08:00
Alex Lam S.L
257ddc3bdb improve compression of undefined, NaN & Infinitiy (#1748) 
- migrate transformation logic from `OutputStream` to `Compressor`
- always turn `undefined` into `void 0` (unless `unsafe`)
- always keep `NaN` except when avoiding local variable redefinition
- introduce `keep_infinity` to suppress `1/0` transform, except when avoiding local variable redefinition

supersedes #1723
fixes #1730
 2017-04-01 03:02:14 +08:00
Alex Lam S.L
1ddc05725d combine rules for binary boolean operations (#1744) 2017-03-31 18:47:44 +08:00
Alex Lam S.L
a0c3836ba0 sort options in alphabetical order (#1743) 
They started off as functional groups I guess, but given the sheer number of options this is becoming too difficult to read.
 2017-03-31 16:41:04 +08:00
Alex Lam S.L
11e9bdc427 fix missing preamble when shebang is absent (#1742) 2017-03-31 15:26:57 +08:00
Alex Lam S.L
c595b84032 fix catch symbol mangling (#1734) 
Only need to look up the immediate non-block/catch scope for the same-name special case.

fixes #1733
 2017-03-31 02:57:47 +08:00
Alex Lam S.L
7cb1adf455 remove paranthesis for -(x*y) (#1732) 2017-03-30 16:09:00 +08:00
Alex Lam S.L
7bea38a05d optimize try-catch-finally (#1731) 
- eliminate empty blocks
- flatten out if try-block does not throw
 2017-03-30 12:16:58 +08:00
Alex Lam S.L
beb9659778 speed up IIFE elimination (#1728) 
- `side_effects` will clean up inner statements, so checking for an empty function body should suffice
- drop side effects when dropping `return` from statement
 2017-03-29 23:27:35 +08:00
Alex Lam S.L
f1a833a7aa speed up equivalent_to() and AST_Switch (#1727) 2017-03-29 22:08:26 +08:00
Alex Lam S.L
2e41cd6394 fix missing parentheses around NaN/Infinity shorthands (#1726) 
fixes #1724
fixes #1725
 2017-03-29 20:53:03 +08:00
Alex Lam S.L
09f77c7d4d output optimal representations of NaN & Infinity (#1723) 
- move these optimisations out from `Compressor` to `OutputStream`
- fixes behaviour inconsistency when running uglified code from global or module levels due to redefinition
 2017-03-29 18:31:55 +08:00
Alex Lam S.L
fef0bf9ee0 improve beautified output of switch blocks (#1721) 2017-03-29 04:40:05 +08:00
Alex Lam S.L
eb48a035e7 fix corner case in unused (#1718) 
When fixing catch-related issue in #1715, it tries to optimise for duplicate definitions but did not take anonymous functions into account.

Remove such optimisation for now and we can cover this as a more general rule later.
 2017-03-29 01:00:21 +08:00
Alex Lam S.L
c909ffb715 fix unused on var of the same name within catch (#1716) 
fixes #1715
 2017-03-28 21:25:49 +08:00
Alex Lam S.L
f71f4905b0 fix is_number() on += (#1714) 
fixes #1710
 2017-03-28 17:08:16 +08:00
Alex Lam S.L
fb177a6312 drop anonymous function name when overshadowed by other declarations (#1712) 
fixes #1709
 2017-03-28 17:02:20 +08:00
Alex Lam S.L
65da9acce6 handle var within catch of the same name (#1711) 
The following code prints `1`:

var a = 1;
!function(){
  a = 4;
  try{
    throw 2;
  } catch (a) {
    var a = 3;
  }
}();
console.log(a);

fixes #1708
 2017-03-28 16:42:39 +08:00
Alex Lam S.L
67d0237f73 fix tail trimming of switch blocks (#1707) 
now guarded under `dead_code`

fixes #1705
 2017-03-28 03:59:13 +08:00
Alex Lam S.L
984a21704e fix mangle for variable declared within catch block (#1706) 
fixes #1704
 2017-03-28 03:26:35 +08:00
Alex Lam S.L
c526da59a1 has_side_effects() should take AST_Switch.expression into account (#1699) 
fixes #1698
 2017-03-27 18:09:35 +08:00
Alex Lam S.L
581630e0a7 fix typeof side effects (#1696) 
`statement_to_expression()` drops `typeof` even if it operates on undeclared variables.

Since we now have `drop_side_effect_free()`, replace and remove this deprecated functionality.
 2017-03-27 04:37:42 +08:00
Alex Lam S.L
f5952933a0 preserve side effects in switch expression (#1694) 
fixes #1690
 2017-03-27 02:32:46 +08:00
Alex Lam S.L
f001e4cb9d fix cascade on anonymous function reference (#1693) 
Unlike normal variables and even function definitions, these cannot be reassigned, even though assignment expressions would "leak" the assigned value as normal.
 2017-03-27 01:58:21 +08:00
Alex Lam S.L
57ce5bd9e0 handle overlapped variable definitions (#1691) 
Process variable definitions with or without assigned values against:
- `arguments`
- named function arguments
- multiple definitions within same scope

Essentially demote variable declarations with no value assignments.

Also fixed invalid use of `AST_VarDef` over `arguments` - should use a member of `AST_SymbolDeclaration` instead.
 2017-03-27 01:30:21 +08:00
Alex Lam S.L
861a79ac9f fix delete related issues in collapse_vars and reduce_vars (#1689) 2017-03-26 19:14:30 +08:00
Alex Lam S.L
e76fb354eb fix cascade on delete operator (#1687) 
Conditions including strict mode would make `delete` return `true` or `false`, and are too complex to be evaluated by the compressor.

Suppress assignment folding into said operator.

fixes #1685
 2017-03-26 18:08:44 +08:00
Alex Lam S.L
3276740779 fallthrough should not execute case expression (#1683) 
- de-duplicate trailing cases only, avoid all potential side-effects
- enable switch statement fuzzing

fixes #1680
 2017-03-26 16:52:38 +08:00
kzc
5509e51098 optimize conditional when condition symbol matches consequent (#1684) 2017-03-26 16:36:33 +08:00
Alex Lam S.L
94f84727ce suppress switch branch de-duplication upon side effects (#1682) 
fixes #1679
 2017-03-26 13:32:43 +08:00
Alex Lam S.L
8a4f86528f fix side-effects detection on switch statements (#1678) 
extension of #1675
 2017-03-26 12:05:44 +08:00
Alex Lam S.L
f83d370f57 improve switch optimisations (#1677) 
- correctly determine reachability of (default) branches
- gracefully handle multiple default branches
- optimise branches with duplicate bodies

fixes #376
fixes #441
fixes #1674
 2017-03-26 05:15:46 +08:00
Alex Lam S.L
b19aa58cff fix has_side_effects() (#1675) 
`AST_Try` is an `AST_Block`, so besides try block we also need to inspect catch and finally blocks for possible side effects.

Also extend this functionality to handle `AST_If` and `AST_LabeledStatement` while we are at it.

fixes #1673
 2017-03-25 23:03:26 +08:00
Alex Lam S.L
0a65de89b9 fix reduce_vars on AST_Switch (#1671) 
Take conditional nature of switch branches into account.

fixes #1670
 2017-03-25 21:17:30 +08:00
Alex Lam S.L
6e86ee950d fix typeof side-effects (#1669) 
`has_side_effects()` does not take `typeof`'s magical power of not tripping over undeclared variable into account.

fixes #1668
 2017-03-25 17:40:18 +08:00
Alex Lam S.L
8ca2401ebe fix dead_code on AST_Switch (#1667) 
Need to call `extract_declarations_from_unreachable_code()`.

fixes #1663
 2017-03-25 16:21:42 +08:00
Alex Lam S.L
a30092e20f fix invalid AST_For.init (#1657) 
Turns out the only place in `Compressor` which can generate invalid `AST_For.init` is within `drop_unused()`, so focus the fix-up efforts.

supercedes #1652
fixes #1656
 2017-03-25 03:18:36 +08:00
Alex Lam S.L
32283a0def fix cascade of evaluate optimisation (#1654) 
Operator has changed, so break out from rest of the rules.

fixes #1649
 2017-03-24 22:09:19 +08:00
Alex Lam S.L
ac51d4c5a0 fix corner case in AST_For.init (#1652) 
Enforce `null` as value for empty initialisation blocks.

fixes #1648
 2017-03-24 19:31:17 +08:00
Alex Lam S.L
0432a7abb9 fix assignment extraction from conditional (#1651) 
fixes #1645
fixes #1646
 2017-03-24 18:52:48 +08:00
Alex Lam S.L
f3a1694a41 fix assignment substitution in sequences (#1643) 
take side effects of binary boolean operations into account

fixes #1639
 2017-03-24 14:30:31 +08:00
Alex Lam S.L
2e0dc97003 improve error marker placement (#1644) 
For AST_UnaryPrefix, points to the operator rather than end of expression.
 2017-03-24 14:28:40 +08:00
kzc
79334dda10 fix regression: CLI options with hyphens like -b ascii-only (#1640) 
fixes #1637
 2017-03-24 11:55:03 +08:00
Alex Lam S.L
e918748d88 improve collapsible value detection (#1638) 
- #1634 bars variables with cross-scope references in between to collapse
- but if assigned value is side-effect-free, no states can be modified, so it is safe to move
 2017-03-24 02:55:32 +08:00
Alex Lam S.L
48ffbef51d account for cross-scope modifications in collapse_vars (#1634) 
mostly done by @kzc

fixes #1631
 2017-03-23 07:17:34 +08:00
Alex Lam S.L
c0f3feae9f introduce compressor.info() (#1633) 
report the following only when `options.warnings = "verbose"`
- unused elements due to inlining
- collpased variables
 2017-03-23 06:49:49 +08:00
Alex Lam S.L
4bceb85cbf throw parse error on invalid assignments (#1627) 
fixes #1626
 2017-03-21 14:11:32 +08:00
Alex Lam S.L
96f8befdd7 fix commit 88fb83a (#1622) 
The following is wrong:
    `a == (b ? a : c)` => `b`
Because:
- `b` may not be boolean
- `a` might have side effects
- `a == a` is not always `true` (think `NaN`)
- `a == c` is not always `false`
 2017-03-19 11:59:42 +08:00
Alex Lam S.L
cd58635dcc fix AST_Binary.lift_sequences() (#1621) 
Commit eab99a1c fails to account for side effects from compound assignments.
 2017-03-19 03:04:22 +08:00
Alex Lam S.L
274331d0ea transform String.charAt() to index access (#1620) 
Guarded by `unsafe` as `charAt()` can be overridden.
 2017-03-19 02:17:15 +08:00
Alex Lam S.L
ac40301813 fix chained evaluation (#1610) 
`reduce_vars` enables substitution of variables but did not clone the value's `AST_Node`.

This confuses `collapse_vars` and result in invalid AST and subsequent crash.

fixes #1609
 2017-03-17 00:26:48 +08:00
Alex Lam S.L
5ae04b3545 make collapse_vars consistent with toplevel (#1608) 
fixes #1605
 2017-03-16 13:22:26 +08:00
Alex Lam S.L
a80b228d8b fix hoist_vars on reduce_vars (#1607) 
`hoist_vars` converts variable declarations into plain assignments, which then confuses `reduce_vars`

fixes #1606
 2017-03-16 12:03:30 +08:00
Alex Lam S.L
cf4bf4ceb1 fix stack issues with AST_Node.evaluate() (#1603) 
As patched in #1597, `make_node_from_constant()` makes inconsistent and sometimes incorrect calls to `optimize()` and `transform()`.

Fix those issues properly by changing the semantics of `evaluate()` and `make_node_from_constant()`, with the side effect that `evaluate()` no longer eagerly converts constant to `AST_Node`.
 2017-03-16 01:02:59 +08:00
Alex Lam S.L
8223b2e0db fix AST_Node.optimize() (#1602) 
Liberal use of `Compressor.transform()` and `AST_Node.optimize()` presents an issue for look-up operations like `TreeWalker.in_boolean_context()` and `TreeWalker.parent()`.

This is an incremental fix such that `AST_Node.optimize()` would now contain the correct stack information when called correctly.
 2017-03-15 18:44:13 +08:00
Alex Lam S.L
381bd3836e minor clean-ups (#1600) 
- remove obsolete optimisation in `AST_Binary` after #1477
- improve `TreeWalker.has_directive()` readability and resilience against multiple visits
 2017-03-14 13:19:05 +08:00
Alex Lam S.L
e3a3db73ae temporary fix for boolean bug (#1597) 
fixes #1592
 2017-03-11 04:59:55 +08:00
Alex Lam S.L
d9344f30b8 disallow parameter substitution for named IIFEs (#1596) 
Self-referenced function has non-fixed values assigned to its parameters.

Let `unused` & `!keep_fnames` do the scanning, then apply `reduce_vars` only to unnamed functions.

fixes #1595
 2017-03-11 03:34:55 +08:00
Alex Lam S.L
cf45e2f79b fixup for #1585 (#1589) 
As patched on `harmony`, `statement()` is the only user of `embed_tokens()` with a missing error branch.

Updated test case and match up with `harmony` to facilitate future merging.
 2017-03-10 10:49:41 +08:00
Alex Lam S.L
9e6b128374 fix catch variable reference in IE8 (#1587) 
`AST_Scope.def_variable()` will overwrite `AST_Symbol.thedef`, so save a copy before calling.

fixes #1586
 2017-03-10 03:15:21 +08:00
Michael Mior
93cdb194f4 Correctly raise a parse exception with a missing loop body (#1585) 2017-03-10 03:08:43 +08:00
Alex Lam S.L
b633706ce4 fix & improve function argument compression (#1584) 
- one-use function call => IIFE should take `eval()` & `arguments` into account
- if unused parameter cannot be eliminated, replace it with `0`

fixes #1583
 2017-03-09 19:11:05 +08:00
Alex Lam S.L
7e465d4a01 scan RHS of dropped assignments (#1581) 
- similar case as #1578 but against #1450 instead
- fix `this` binding in #1450 as well

closes #1580
 2017-03-09 05:22:27 +08:00
Alex Lam S.L
711f88dcb4 scan assignment value in drop_unused() (#1578) 
those were not optimised for `unused` before, which made it necessary for `reduce_vars` to have separate steps for `keep_fnames`

docs update by @kzc

closes #1577
 2017-03-08 18:37:32 +08:00
Alex Lam S.L
c7cdcf06a6 fix function name eliminiation (#1576) 
Function expression can be assigned to a variable and be given a name. Ensure function name is the reduced variable before clearing it out.

fixes #1573
fixes #1575
 2017-03-08 12:39:57 +08:00
Alex Lam S.L
dedbeeff15 plan B for IE8 do-while semi-colon fix (#1572) 
- omitting trailing semi-colon in do-while breaks non-browser parser, e.g. uglify-js 1.x
- trailing semi-colon only breaks IE8 if followed by `else` or `while`
- always use braces in do-while body to workaround 2nd case with no size loss in compression

fixes #1568
 2017-03-08 05:07:05 +08:00
Alex Lam S.L
bd6dee52ab fix return from recursive IIFE (#1570) 
`side-effects` did not account for IIFEs being able to reference itself thus making its return value potentially significant
 2017-03-08 03:31:51 +08:00
Alex Lam S.L
8a8a94a596 fix deep cloning of labels (#1565) 
`AST_Label.references` get `.initialize()` to `[]` every time after `.clone()`

So walk down the tree to pick up the cloned `AST_LoopControl` pieces and put it back together.
 2017-03-07 18:38:27 +08:00
Alex Lam S.L
8153b7bd8a transform function calls to IIFEs (#1560) 
- expose function body to call sites for potential optimisations
- suppress substitution of variable used within `AST_Defun`
 2017-03-07 15:37:52 +08:00
Alex Lam S.L
d787d70127 avoid substitution of global variables (#1557) 
- unless `toplevel` is enabled
- global `const` works as before
 2017-03-07 03:11:03 +08:00
kzc
3ac2421932 collapse_vars: do not replace a constant in loop condition or init (#1562) 2017-03-07 01:42:33 +08:00
Alex Lam S.L
a9fc9ddc33 suppress semicolons after do/while (#1556) 
- unless both `beautify` & `screw-ie8` are enabled
- deprecate workaround for if-do-while-else

fixes #186
 2017-03-06 17:31:35 +08:00
Alex Lam S.L
067e5a5762 fixup for #1553 (#1555) 
- `++a` is the one that is foldable
- transform `a++` into `++a` for better optimisation
 2017-03-05 17:15:37 +08:00
Alex Lam S.L
35a849dc48 collapse assignment with adjacent subsequent usage (#1553) 
- consolidate `cascade` optimisations
- support ++/-- postfixes
- remove redundant optimisation identified in #1460

fixes #368
 2017-03-05 14:56:14 +08:00
Alex Lam S.L
b70591be1a handle variable declaration within catch blocks (#1546) 
accounts for IE8- scoping
 2017-03-05 13:13:44 +08:00
Alex Lam S.L
b33e7f88e6 improve unsafe on undefined (#1548) 
`unsafe` turns undefined keyword into a variable of the same name if found, but that interferes with other related optimisations.

Keep track of such transformations to ensure zero information loss in the process.
 2017-03-05 13:09:27 +08:00
Alex Lam S.L
1f0333e9f1 stay safe with constants in IE8- (#1547) 
- `undefined` etc. can be redefined at top-level for IE8-, so disable related optimisations
- fixed `--support-ie8` catch mangle bug
 2017-03-05 12:51:11 +08:00
Alex Lam S.L
eb98a7f2f3 fix handling of shebang and preamble (#1545) 
fixes #1332
 2017-03-05 12:16:02 +08:00
Alex Lam S.L
78d1bb92d4 fix a corner case in #1530 (#1552) 2017-03-05 12:12:59 +08:00
kzc
ce54c9ccee disallow collapse_vars constant replacement in for-in statements (#1543) 2017-03-04 02:39:54 +08:00
Alex Lam S.L
07accd2fbb process code with implicit return statement (#1522) 
Bookmarklet for instance implicitedly assumes a "completion value" without using `return`.
The `expression` option now supports such use cases.
Optimisations on IIFEs also enhanced.

fixes #354
fixes #543
fixes #625
fixes #628
fixes #640
closes #1293
 2017-03-03 18:13:07 +08:00
Alex Lam S.L
18059cc94f compress numerical expressions (#1513) 
safe operations
- `a === b` => `a == b`
- `a + -b`  => `a - b`
- `-a + b`  => `b - a`
- `a+ +b`   => `+b+a`

associative operations
(bit-wise operations are safe, otherwise `unsafe_math`)
- `a + (b + c)`       => `(a + b) + c`
- `(n + 2) + 3`       => `5 + n`
- `(2 * n) * 3`       => `6 * n`
- `(a | 1) | (2 | d)` => `(3 | a) | b`

fixes #412
 2017-03-03 18:04:32 +08:00
Alex Lam S.L
b5e0e8c203 facilitate fix for #1531 (#1542) 2017-03-03 07:12:24 +08:00
Alex Lam S.L
17b81350d4 fix chained assignment with unused (#1540) 
When #1450 optimises `a=b=42`, it stops after the first variable even if both are unused.

fixes #1539
 2017-03-03 04:45:20 +08:00
kzc
4d63d4f5b3 collapse_vars should not replace constant in for-in init section (#1538) 
fixes #1537
 2017-03-03 03:51:15 +08:00
Alex Lam S.L
70d72ad806 properly cover all cases of for-in loop variables (#1536) 2017-03-03 02:39:57 +08:00
Alex Lam S.L
fe9227a41b fix reference marking in for-in loops (#1535) 
fixes #1533
 2017-03-03 00:56:06 +08:00
Alex Lam S.L
b49e142a26 disable do{...}while(false) optimisation (#1534) 
- fails to handle `break` in body

fixes #1532
 2017-03-03 00:54:41 +08:00
kzc
ee3b39b909 optimize trivial IIFEs returning constants (#1530) 2017-03-02 15:11:40 +08:00
Alex Lam S.L
9699ffb1af trim unused invocation parameters (#1526) 2017-03-02 11:33:59 +08:00
Alex Lam S.L
fdc9b9413b minor improvement to string optimisation (#1514) 
- "" + "a"     => "a"
- "" + a + "b" => a + "b"
- "a" + ""     => "a" (improving on #45)
 2017-03-02 11:31:39 +08:00
Alex Lam S.L
7aa69117e1 fix corner cases in reduce_vars (#1524) 
Avoid variable substitution in the following cases:
- use of variable before declaration
- declaration within conditional code blocks
- declaration within loop body

fixes #1518
fixes #1525
 2017-03-02 00:20:53 +08:00
Alex Lam S.L
c2334baa48 fix crash on missing props to string_template() (#1523) 
Patched up `make_node()` without `orig`.

There may be other cases where `start` could be missing, so make it print "undefined" instead of crashing.

fixes #1518
 2017-03-01 15:25:26 +08:00
Alex Lam S.L
f5cbe19b75 invert reduce_vars tracking flag (#1519) 
Modules like webpack and grunt-contrib-uglify still uses `ast.transform(compressor)` before `Compressor.compress(ast)` was introduced.

Workaround this compatibility issue by deactivating `reduce_vars` in such case.

Also fix use case with omitted `options` when calling `Compressor()`.

fixes #1516
 2017-03-01 04:12:10 +08:00
Alex Lam S.L
b34fa11a13 fix evaluate on object getter & setter (#1515) 2017-03-01 02:03:47 +08:00
Alex Lam S.L
4365a51237 temporarily disables reduce_vars (#1517) 
... as we investigate #1516
 2017-03-01 00:25:43 +08:00
Alex Lam S.L
858e6c78a4 warn & drop #__PURE__ iff IIFE is dropped (#1511) 
- consolidate `side-effects` optimisations
- improve string `+` optimisation
- enhance literal & `conditionals` optimisations
 2017-02-28 02:25:44 +08:00
Alex Lam S.L
872270b149 improve error messages (#1506) 
- better inheritance of `Error` sub-classes
- mark parse error against source in CLI

closes #235
closes #348
closes #524
closes #1356
closes #1405
 2017-02-27 03:40:54 +08:00
Alex Lam S.L
13be50a4a9 faster tree transversal (#1462) 
- convert `[].forEach()` to for-loops
 2017-02-26 05:58:26 +08:00
Alex Lam S.L
16cd5d57a5 consolidate evaluate & reduce_vars (#1505) 
- improve marking efficiency
- apply smarter `const` replacement to `var`

fixes #1501
 2017-02-26 00:40:33 +08:00
Ondřej Španěl
852f78491a Avoid using exports when undefined (#1471) 
Makes direct usage within web browser easier, even if officially unsupported.
 2017-02-24 08:51:24 +08:00
Alex Lam S.L
229e42cdee Merge pull request #1485 from alexlamsl/merge-2.8.0 
2.8.0 staging
 2017-02-24 07:33:57 +08:00
alexlamsl
4e49302916 enable collapse_vars & reduce_vars by default 
- fix corner cases in `const` optimisation
- deprecate `/*@const*/`

fixes #1497
closes #1498
 2017-02-24 01:46:57 +08:00
kzc
1e51586996 Support marking a call as pure 
A function call or IIFE with an immediately preceding comment
containing `@__PURE__` or `#__PURE__` is deemed to be a
side-effect-free pure function call and can potentially be
dropped.

Depends on `side_effects` option.

`[#@]__PURE__` hint will be removed from comment when pure
call is dropped.

fixes #1261
closes #1448
 2017-02-21 14:24:18 +08:00
Ondřej Španěl
d48a3080ac Fix: AST_Accessor missing start / end tokens 
fixes #1492
closes #1493
 2017-02-21 13:32:16 +08:00
alexlamsl
26fbeece1c fix pure_funcs & improve side_effects 
- only drops side-effect-free arguments
- drop side-effect-free parts with discarded value from `AST_Seq` & `AST_SimpleStatement`

closes #1494
 2017-02-21 13:31:59 +08:00
alexlamsl
8898b8a0fe clean up max_line_len 
- never exceed specified limit
- otherwise warning is shown
- enabled only for final output

closes #1496
 2017-02-21 13:29:58 +08:00
alexlamsl
ec64acd2c8 introduce unsafe_proto 
- `Array.prototype.slice` => `[].slice`

closes #1491
 2017-02-21 13:29:58 +08:00
alexlamsl
ac0b61ed6e remove extraneous spaces between ++/+/--/- 
fixes #1377
closes #1488
 2017-02-21 13:29:58 +08:00
alexlamsl
09f9ae2de9 improve --beautify bracketize 
reduce whitespaces from if-else statements

fixes #1482
closes #1483
 2017-02-21 13:29:58 +08:00
alexlamsl
e275148998 enhance global_defs 
- support arrays, objects & AST_Node
- support `"a.b":1` on both cli & API
- emit warning if variable is modified
- override top-level variables

fixes #1416
closes #1198
closes #1469
 2017-02-21 13:29:58 +08:00
alexlamsl
974247c8c0 evaluate AST_SymbolRef as parameter 
fix invalid boolean conversion now exposed in `make_node_from_constant()`

closes #1477
 2017-02-21 13:29:58 +08:00
alexlamsl
a0f4fd390a improve reduce_vars and fix a bug 
- update modified flag between compress() passes
- support IIFE arguments
- fix corner case with multiple definitions

closes #1473
 2017-02-21 13:29:58 +08:00
alexlamsl
b8b133d91a improve keep_fargs & keep_fnames 
- utilise in_use_ids instead of unreferenced()
- drop_unused now up-to-date for subsequent passes

closes #1476
 2017-02-21 13:29:58 +08:00
kzc
6ffbecb72b smarter const replacement taking name length into account 
closes #1459
 2017-02-21 13:29:58 +08:00
alexlamsl
f0ff6189be clean up negate_iife 
- remove extra tree scanning phase for `negate_iife`
- `negate_iife` now only deals with the narrowest form, i.e. IIFE sitting directly under `AST_SimpleStatement`
- `booleans`, `conditionals` etc. will now take care the rest via more accurate accounting
- `a(); void b();` => `a(); b();`

fixes #1288
closes #1451
 2017-02-21 13:29:58 +08:00
alexlamsl
6b3c49e458 improve string concatenation 
shuffle associative operations to minimise parentheses and aid other uglification efforts

closes #1454
 2017-02-21 13:29:57 +08:00
alexlamsl
f584ca8d07 -c sequences=N suboptimal at N expression cutoff 
N = 2:
  a;
  b;
  c;
  d;
was:
  a, b;
  c;
  d;
now:
  a, b;
  c, d;

fixes #1455
closes #1457
 2017-02-21 13:29:57 +08:00
alexlamsl
ae4db00991 tweak do-while loops 
- `do{...}while(false)` => `{...}`
- clean up `AST_While` logic

closes #1452
 2017-02-21 13:29:57 +08:00
alexlamsl
100307ab31 fixes & improvements to [].join() 
fixes
- [a].join() => "" + a
- ["a", , "b"].join() => "a,,b"
- ["a", null, "b"].join() => "a,,b"
- ["a", undefined, "b"].join() => "a,,b"

improvements
- ["a", "b"].join(null) => "anullb"
- ["a", "b"].join(undefined) => "a,b"
- [a + "b", c].join("") => a + "b" + c

closes #1453
 2017-02-21 13:29:57 +08:00
alexlamsl
148047fbbf drop unused: toplevel, assign-only 
- assign statement does not count towards variable usage by default
- only works with assignments on the same scope level as declaration
- can be disabled with `unused` set to "keep_assign"
- `toplevel` to drop unused top-level variables and/or functions
- `top_retain` to whitelist top-level exceptions

closes #1450
 2017-02-21 13:29:57 +08:00
kzc
d11dca3cf9 fix stray else in compress with conditionals=false 
closes #1449
 2017-02-21 13:29:57 +08:00
alexlamsl
e5badb9541 enable typeof "undefined" for general use 
move out of unsafe, guard corner case with screw_id8 instead

closes #1446
 2017-02-18 19:01:42 +08:00
alexlamsl
fa668a28b4 fix corner case in keep_fnames 
happens when inner function:
- just below top level
- not referenced
- `unused` is disabled

closes #1445
 2017-02-18 19:00:54 +08:00
alexlamsl
686a496b1c remove unused AST_Scope.nesting & AST_SymbolRef.frame 
they are computed but never used

closes #1444
 2017-02-18 18:59:40 +08:00
alexlamsl
11676f9d72 fix crash in unsafe replacement of undefined 
remove extraneous call to AST_SymbolRef.reference()

closes #1443
 2017-02-18 18:58:23 +08:00
Anthony Van de Gejuchte
dd31d12a91 Improve optimizing function() { if(c){return foo} bar();} 
closes #1437
 2017-02-18 18:56:18 +08:00
Anat Dagan
81f1df14d7 in mangle_names there is a check that the variable name is legal and that it is not a reserved word. This should apply to propsmangle as well. 2017-02-10 14:13:47 +02:00
Alex Lam S.L
1eaa211e09 fix mangling collision with keep_fnames (#1431) 
* fix mangling collision with keep_fnames
fixes #1423

* pass mangle options to figure_out_scope()
bring command-line in line with minify()
 2017-01-26 12:18:28 +01:00
Alex Lam S.L
0610c020b1 optimise binary operands with evaluate() (#1427) 
- remove call to evaluate() in is_constant() and let nested optimize() does its job instead
- reject RegExp in is_constant() and remove special case logic under collapse_vars
- operands to conditionals optimisation are now always evaluate()-ed
- throw error in constant_value() instead of returning undefined to catch possible bugs, similar to make_node_from_constant()
- optimise binary boolean operators under `evaluate` instead of `conditionals`
 2017-01-26 12:16:50 +01:00
Alex Lam S.L
0d7d4918eb augment evaluate to extract within objects (#1425) 
- gated by `unsafe`
- replaces previous optimisation specific to String.length
- "123"[0] => 1
- [1, 2, 3][0] => 1
- [1, 2, 3].length => 3
- does not apply to objects with overridden prototype functions
 2017-01-26 12:14:18 +01:00
alexlamsl
48284844a4 add missing LHS cases which global_defs should avoid 2017-01-19 21:06:28 +01:00
Martijn Swaagman
98f330658f Generate source map data from normalized files 
If using `inSourceMap` this fix will ensure the copying of `sourcesContent` is based on potentially normalized `sources` values (https://github.com/mozilla/source-map/blob/master/lib/source-map-consumer.js#L304-L309).

For example `normalize` (https://github.com/mozilla/source-map/blob/master/lib/util.js#L80-L123) will rewrite `./dist/mySource.js` to `dist/mySource.js` in the target `_sources` of the `SourceMapConsumer`. As a result `orig_map.sourceContentFor(source, true);` would return `null` since the orginal `source` was no longer available in the consumer. By using the keys generating from the `SourceMapConsumer.constructor` consistency is ensured.
 2016-11-29 20:42:56 +01:00
Ashley (Scirra)
2a9989dd18 Add --mangle-props-debug and fix --mangle-props=unquoted collision 
Patch by @AshleyScirra

Based on: PR #1316

Renamed the CLI debug option to --mangle-props-debug

Fixes: #1321 name collision in --mangle-props=unquoted
 2016-11-29 20:25:39 +01:00
Anthony Van de Gejuchte
79b98a9fe8 Do not overwrite options.comments + cleanup 2016-11-29 20:24:08 +01:00
Anthony Van de Gejuchte
8d74f34373 Don't filter shebangs when using the 'some' comment filter 
Also clarify documentation a bit more about using regexp as filter
 2016-10-23 21:31:03 +02:00
Jann Horn
266ddd9639 fix uses_arguments handling (broken since 6605d15783) 
Using the symbol declaration tracking of UglifyJS doesn't make sense here
anyway, `arguments` always comes from something in the current scope.

fixes #1299
 2016-10-23 21:29:18 +02:00
Richard van Velzen
6389e52305 Remove console.log and add extra test case 2016-10-06 14:11:32 +02:00
Richard van Velzen
e05510f3bc Add an option to wrap IIFEs in parenthesis 
For #1307.
 2016-10-06 14:11:32 +02:00
kzc
fc9804b909 Fix (typeof side_effect()) in boolean context 
Fixes #1289 with suggestion by @rvanvelzen
 2016-10-06 13:50:11 +02:00
alexlamsl
4761d07e0b Optimize unmodified variables 2016-10-01 11:36:11 +02:00
Anthony Van de Gejuchte
0111497fc9 Make all comment options in cli available in js api 
Also removing more code within "loop" while at it.
 2016-09-06 17:54:45 +02:00
kzc
25fc02743a Account for side effects in string + expr optimization 2016-09-01 09:24:56 -04:00
kzc
0bd8053524 implement optimization: (x = 2 * x) ---> (x *= 2) 2016-08-30 08:43:02 -04:00
Richard van Velzen
8430123e9d Fix negate_iife transform to return a correct tree for nested IIFEs 
Fix for #1256, partially reverts d854523783
 2016-08-17 11:55:59 +02:00
kzc
d854523783 Fix negate_iife regression #1254 2016-08-17 01:29:34 -04:00
kzc
de619ae5a6 Fix --mangle-props and --mangle-props=unquoted 
Fixes: #1247

Fix --mangle-props and --name-cache inconsistency.
AST_Dot and AST_Sub properties are now mangled by --mangle-props
without regard to being used in an assignment statement.

Note: if --mangle-props is used then *all* javascript files used must
be uglified with the same mangle options.

Fix the ignore_quoted=true mangle option, also known as
`--mangle-props=unquoted`.  If a given property is quoted anywhere
it will not be mangled in any quoted or non-quoted context.
 2016-08-14 21:51:25 +02:00
kzc
fb049d3a81 Fix unneeded parens around unary args in new expression. 2016-08-14 21:38:38 +02:00
Anthony Van de Gejuchte
642273c290 Legacy octal integer strict mode fixes 2016-07-21 14:42:16 +02:00
Lauri Pokka
41a9329409 lib/sourcemap.js: Copy sourceContent from old souce-map to the new source-map. Should fix #882 2016-07-17 19:36:15 +02:00
Anthony Van de Gejuchte
7eb52d2837 Keep const in own scope while compressing 
- Fixes #1205
- Fix provided by @kzc
 2016-07-15 13:20:52 +02:00
kzc
eb63fece2f Fix mangle with option keep_fnames=true for Safari. 
Fixes: #1202
 2016-07-15 13:18:14 +02:00
Anthony Van de Gejuchte
2d8af8947e Fix error style for regex errors 2016-07-15 13:14:30 +02:00
Anthony Van de Gejuchte
698705a820 Don't convert all strings to directives from moz-ast 2016-07-03 12:36:57 +02:00
kzc
b40d5de69c Change the default sequences limit to 200 to speed up compress. 
Has little or no impact on minification size in the majority of
cases but can speed up rollup builds significantly.

This sequences change also has the beneficial side effect of avoiding
"stack size exceeded" errors on very large input files.

The user is free to alter the sequences limit if they are so inclined.
The previous sequences limit was 2000. 20 is often sufficient.
 2016-07-01 09:41:31 +02:00