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1219 Commits

Author SHA1 Message Date
Alex Lam S.L
11923e3ae8 reject non-toplevel import/export (#2128) 
fixes #2124
 2017-06-21 03:18:48 +08:00
Alex Lam S.L
62d1fbf645 support export statements properly (#2126) 
- mangle & compress correctly with `toplevel`
- retain non-toplevel import/export
- parse & output `export { variable as name }`
- remove extraneous spaces from `beautify`


fixes #2038
fixes #2124
 2017-06-21 00:51:36 +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
kzc
849ba79dee retain names in export default class and function (#2122) 
fixes #2121
 2017-06-19 14:30:59 +08:00
alexlamsl
daaf1273fa Merge branch 'master' into harmony-v3.0.18 2017-06-18 15:49:49 +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
kzc
3fa862ce19 support shorthand property named "async" (#2108) 2017-06-16 12:18:18 +08:00
Alex Lam S.L
33405bb24b enforce inline scope restriction (#2106) 
fixes #2105
 2017-06-16 03:21:38 +08:00
alexlamsl
78cf35f89c Merge branch 'master' into harmony-v3.0.17 2017-06-15 19:01:36 +08:00
Alex Lam S.L
b85a358deb suppress inline of this (#2103) 
fixes #2101
 2017-06-15 12:14:16 +08:00
kzc
100e18305d first cut of async/await (#2098) 
- async arrow functions not yet supported


fixes #1789
 2017-06-15 06:15:48 +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
alexlamsl
8af362ed57 Merge branch 'master' into harmony-v3.0.16 2017-06-14 17:09:30 +08:00
Alex Lam S.L
68138f2281 fix reduce_vars on AST_Arrow (#2091) 
fixes #2090
 2017-06-14 16:40:37 +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
a7971f4e34 fix unused crash with top-level AST_Var (#2066) 
fixes #2063
 2017-06-07 19:12:35 +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
kzc
82fefc5d29 fix class expression statements (#2051) 
- class expression statements require parentheses
- allow unused class expression statements to be dropped

fixes #1782
closes #1784
 2017-06-04 02:45:26 +08:00
kzc
753932b302 drop unused arrow functions (#2050) 2017-06-04 00:20:46 +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
1edbd6556f fix beautify whitespace output within AST_Destructuring (#2046) 
fixes #2044
 2017-06-02 18:50:39 +08:00
alexlamsl
ee5c03f7f1 Merge branch 'master' into harmony-v3.0.15 2017-06-01 18:26:09 +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
alexlamsl
c814060b4a Merge branch 'master' into harmony-v3.0.14 2017-05-31 11:42:54 +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
303293e4aa fix side_effects on AST_Class (#2031) 
fixes #2028
 2017-05-31 01:44:29 +08:00
Alex Lam S.L
23265ac253 mangle destructuring function parameters (#2029) 
fixes #2025
 2017-05-30 23:41:55 +08:00
Alex Lam S.L
0cc6dedccc fix block elimination (#2023) 
fixes #1664
fixes #1672
 2017-05-30 14:59:54 +08:00
kzc
ec63588496 fix compress of IIFE with destructuring args (#2022) 2017-05-30 13:17:06 +08:00
Alex Lam S.L
c2e471e3ad fix if_return on block-scoped variables (#2021) 
fixes #1317
 2017-05-29 18:08:08 +08:00
alexlamsl
520da57fdc Merge branch 'master' into harmony-v3.0.13 2017-05-29 10:58:05 +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
alexlamsl
94d2aeee89 fix block-scoped function for ES6 
fixes #1903
 2017-05-27 19:28:07 +08:00
alexlamsl
aa835eb0f6 Merge branch 'master' into harmony-v3.0.12 2017-05-27 18:12:10 +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
39d4d7e20a fix export related issues (#2005) 
- `mangle` non-exported names
- `unused` on `export` of `function`
- `hoist_funs` on `export`
- `export default`
  - prohibit definition statements
  - parse `AST_Defun` properly
  - drop only unused class and function names


fixes #2001
fixes #2004
 2017-05-26 13:35:40 +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
02811ce35e fix issues related to export & function (#2002) 
- `unused` function names
- confusion with function call syntax

fixes #2001
 2017-05-26 03:12:52 +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
c988e5f4d6 remove AST_ArrowParametersOrSeq (#1997) 2017-05-24 17:45:18 +08:00
alexlamsl
37e549ff4f Merge branch 'master' into harmony-v3.0.11 2017-05-23 22:29:04 +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
kzc
7bcb442e4c fix destructuring bugs in mangle and compress (#1992) 
- destructuring mangle
- destructuring array default values

fixes #1335
 2017-05-23 02:53:01 +08:00
kzc
a658cd84a5 fix destructuring of non string keys (#1989) 2017-05-22 16:38:03 +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
alexlamsl
a3053c537a Merge branch 'master' into harmony-v3.0.10 2017-05-21 01:36:38 +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
a2172e1a99 fix parsing of yield as object key (#1976) 
fixes #1974
 2017-05-20 13:11:37 +08:00
alexlamsl
02b14528fa Merge branch 'master' into harmony-v3.0.9 2017-05-19 09:51:00 +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
3db2001633 suppress unused on block variables (#1969) 
fixes #1968
 2017-05-19 00:28:19 +08:00
alexlamsl
5f29fced0a Merge branch 'master' into harmony-v3.0.8 2017-05-18 14:54:18 +08:00
kzc
b1b918e6d6 better extends paren fix (#1962) 2017-05-18 02:36:29 +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
kzc
ebb469e4cd fix class extends expression (#1956) 2017-05-17 03:29:25 +08:00
kzc
c22d26b483 support export default of anonymous functions and classes (#1954) 2017-05-17 03:28:24 +08:00
alexlamsl
99fb3e8f0d Merge branch 'master' into harmony-v3.0.6 2017-05-16 06:48:23 +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
756c9aa7dc keep minify() options in sync (#1940) 2017-05-15 20:29:48 +08:00
alexlamsl
81243c4e71 Merge branch 'master' into harmony-v3.0.5 2017-05-15 18:58:54 +08:00
alexlamsl
cd6e849555 Revert "remove support for const (#1910)" 
This reverts commit c391576d52.
 2017-05-15 18:38:16 +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
kzc
4d8f289eb0 fix export default expression; (#1932) 2017-05-13 12:56:46 +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
945ba64160 Merge pull request #1923 from alexlamsl/harmony-v3.0.4 
Merging from master for 3.0.4
 2017-05-12 06:52:21 +08:00
Anthony Van de Gejuchte
c699200398 Make sure globals can be accessed from the browser (#1920) 
Note: no tests as there are no integration tests
 2017-05-12 05:50:35 +08:00
alexlamsl
daf44f2b21 Merge branch 'master' into harmony-v3.0.4 2017-05-12 05:13:11 +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
Gyusun Yeom
fcd90db30d fix safari syntax error - declare twice (#1851) 
To avoid Safari bug, scope of for loop should enclose parent scope variables.


fixes #1753
 2017-05-11 16:48:43 +08:00
kzc
9d59c693c2 fix for-of loop with const iterator (#1899) 2017-05-10 11:36:03 +08:00
Alex Lam S.L
2944e3df7d fix collapse_vars on destructuring declarations (#1889) 
fixes #1886
 2017-05-09 17:44:28 +08:00
alexlamsl
81f1311b24 Merge branch 'master' into harmony-v3.0.1 2017-05-09 02:10:06 +08:00
Alex Lam S.L
2433bb4e52 fix Unicode handling in parser (#1884) 
There was an implicit assumption that first character within surrogate header range implies the next character must form a surrogate pair, which is not necessarily true.
 2017-05-09 01:58:31 +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
alexlamsl
b4c18f6b83 Merge branch 'master' into harmony-v3.0.0 2017-05-07 15:34:16 +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
kzc
73d6438773 fix \\n and \\r in template strings (#1857) 
fixes #1856
 2017-04-30 17:05:32 +08:00
kzc
5c6316a37d fix class method formatting (#1853) 
fixes #1852
 2017-04-29 18:13:25 +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
alexlamsl
0d8597e904 Merge branch 'master' into harmony-v2.8.22 2017-04-09 15:50:38 +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
Anthony Van de Gejuchte
c20bb99a62 Put expression after extend between parentheses if necessary (#1780) 2017-04-04 12:38:13 +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
Anthony Van de Gejuchte
2377171200 Fix walker not able to handle destr pattern in spread when compressing (#1438) 2017-04-04 01:23:22 +08:00
Anthony Van de Gejuchte
603d92effc Allow AST_DefaultAssign as parameter (#1778) 
This may be the case for parsing arrow functions,
as left side expressions are converted to destructuring patterns
before being converted to parameters.
 2017-04-04 00:46:05 +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
Anthony Van de Gejuchte
17f0cc359f Allow empty destructuring (#1773) 2017-04-03 17:21:27 +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
alexlamsl
4614b5b46e Merge branch 'master' into harmony-v2.8.21 2017-04-02 17:25:20 +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
Ondřej Španěl
2f93058c6e More variants of import added (#1738) 
- `import * from "x.js"`
- `import * as Name from "x.js"`
 2017-03-31 17:52:56 +08:00
Ondřej Španěl
a729c43e87 Another variant of export added - export {Name}. (#1737) 2017-03-31 17:51:27 +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
alexlamsl
d717bf9ce8 Merge branch 'master' into harmony 2017-03-31 12:54:03 +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
Ondřej Španěl
5dea52266b [ES6] Implemented parse for export Name from Module variants. (#1701) 
- add `AST_Export` new variants output
- add tests to `test/compress/`
- update `$propdoc` of `AST_Export` ("exported_names" & "module_name")
- add tests for `export ...  as ...` variants
 2017-03-30 17:07:50 +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
alexlamsl
1e2b0aaa04 Merge branch 'master' into harmony-v2.8.17 2017-03-28 22:03:46 +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
kzc
6a54de79b5 optimize trivial arrow functions with a return statement in braces (#1681) 
fixes #1676
 2017-03-26 12:03:11 +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
alexlamsl
97d0fc271d Merge branch 'master' into harmony-v2.8.15 2017-03-23 15:28:17 +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
alexlamsl
44d6b47bdc Merge branch 'master' into harmony-v2.8.14 2017-03-19 15:31:18 +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
alexlamsl
75c3c8963f Merge branch 'master' into harmony-v2.8.13 2017-03-18 02:52:45 +08:00
Alex Zaworski
d26b7522d9 Allow 'name' as object literal shorthand property (#1617) 
fixes #1613
 2017-03-18 01:29:13 +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
alexlamsl
8f7ab602e2 Merge branch 'master' into harmony-v2.8.12 2017-03-14 13:17:42 +08:00
Alex Lam S.L
1dd339f95e fix unused crashes (#1599) 
- `AST_DefaultAssign` on `keep_fargs`
- `AST_Expansion on` `keep_fargs`
- `AST_Destructuring` on top-level declarations without `toplevel`
 2017-03-14 13:13:43 +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
alexlamsl
f4a12b34f2 Merge branch 'master' into harmony-v2.8.11 2017-03-10 11:17:49 +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
alexlamsl
8f4b45f4f8 Merge branch 'master' into harmony-v2.8.10 2017-03-09 06:02:28 +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
952e2656eb Merge pull request #1567 from alexlamsl/harmony-v2.8.8 
Merging from master for 2.8.8
 2017-03-07 23:56:23 +08:00
qinayi
240383a314 is_block_scope return true when current node is an instance of AST_IterationStatement. then the scope of let variable can be figured out accurately (#1561) 2017-03-07 23:50:58 +08:00
alexlamsl
250b782b1e Merge branch 'master' into harmony-v2.8.8 2017-03-07 20:25:52 +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
alexlamsl
aa605495f8 Merge branch 'master' into harmony-v2.8.6 2017-03-05 21:42:34 +08:00
kzc
33a26d456b patch up #1543 for harmony 
fixes #1537
 2017-03-05 21:39:31 +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
alexlamsl
49d9ac1c43 Merge branch 'master' into harmony-v2.8.6 2017-03-05 16:03:56 +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
alexlamsl
f704e9b65c fix destructing crash in reduce_vars 
fixes #1531
 2017-03-03 07:23:46 +08:00