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1019 Commits

Author SHA1 Message Date
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
alexlamsl
0b77d861a8 Merge branch 'master' into harmony-v2.8.5 2017-03-03 07:17:52 +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
alexlamsl
80f3ad3ce0 Merge branch 'master' into harmony-v2.8.4 2017-03-02 11:16:55 +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
alexlamsl
8a7a4749c7 Merge branch 'master' into harmony-v2.8.2 2017-03-01 11:06:33 +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
alexlamsl
478aaab469 fix parser test 
not sure if `start.pos` is correct, but oh well
 2017-02-28 14:08:31 +08:00
kzc
a0eaff750d fix parsing of arrow function with bind 
fixes #1510
 2017-02-28 02:47:33 +08:00
alexlamsl
57777b6cfa Merge branch 'master' into harmony-2.8.0 2017-02-28 02:28:58 +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
kzc
8d205f7f39 fix parser handling of comments 2017-02-27 14:54:47 +08:00
alexlamsl
c59bf5e8d8 fix SymbolDef.global 
properly compute for top-level block-variables
 2017-02-27 06:20:08 +08:00
alexlamsl
d2d3a6e065 fix double-descend() 
for `AST_Export` in `AST_Toplevel.figure_out_scope()`
 2017-02-27 06:06:09 +08:00
alexlamsl
7755733716 fix "Starting destructuring." 
commit 32f76f7ff does not take into account `AST_SymbolFunarg` is also `AST_SymbolVar`, so don't need to call `AST_Scope.def_variable()` twice
 2017-02-27 05:30:18 +08:00
alexlamsl
b3a987b0df fix up drop_unused() 2017-02-27 05:11:01 +08:00
alexlamsl
88a338f29e Merge branch 'master' into harmony-2.8.0 2017-02-27 04:37:48 +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
Anthony Van de Gejuchte
07734b000a Destructuring consistency fixes (#1417) 
- Use AST_Destructuring for lhf assignment patterns
- Use AST_DefaultAssign for default assignments
- Add more checks for lhs expressions
- Add lots of testing
- Cleanup ast (e.g. remove default property)
- Fix #1402 based on a patch from @kzc
- Refine spread allowance in array destructring pattern
- Add destructuring AST tree checker
 2017-02-24 08:49:19 +08:00
Anthony Van de Gejuchte
85c1cba760 Remove duplicated code (#1456) 
[ES6] Remove duplicated code
 2017-02-24 08:48:13 +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
Richard van Velzen
4bd31607f6 Merge branch 'master' into harmony 2017-01-26 13:02:22 +01:00
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
Anthony Van de Gejuchte
4728bc73ad Allow parsing regexp after arrow token (#1439) 2017-01-26 12:06:46 +01:00
alexlamsl
48284844a4 add missing LHS cases which global_defs should avoid 2017-01-19 21:06:28 +01:00
Anthony Van de Gejuchte
52ce9a333c Fix compression with unused containing destructuring 2017-01-19 21:04:28 +01:00
kzc
abbeb266b5 [ES6] output parens for yield when parented by AST_Dot or AST_Sub (#1419) 2017-01-19 17:15:59 +01:00
Anthony Van de Gejuchte
b11c5151bc Fix regression with non-ascii function identifiers 
Regression since 110a1ac885
 2017-01-19 16:47:37 +01:00
Richard van Velzen
ee26e7f11b Merge branch 'master' into harmony 2016-11-29 20:50:27 +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
Anthony Van de Gejuchte
1b2c02c944 Fix nlb property for template strings tokens starting with nlb 
Also add .gitattributes to checkout lf eol style
 2016-11-29 20:36:00 +01:00
Anthony Van de Gejuchte
0aa526e72c Do not allow arrow functions in the middle of an expression 2016-11-29 20:32:05 +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
c2112d5886 Fix case where a lonely var is used as computed property 2016-11-29 20:19:01 +01:00
Anthony Van de Gejuchte
5f6825f9ec Introduce is_block_scope to AST_Node to determine block scope. 
Will return false if AST_Node is instance of AST_Scope for now.
 2016-10-24 21:28:32 +02:00
Anthony Van de Gejuchte
7e80a979a7 Remove AST_ObjectComputedKeyVal 2016-10-23 22:12:30 +02:00
Richard van Velzen
b7bb706150 Merge branch 'master' into harmony 2016-10-23 22:11:27 +02:00
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
Anthony Van de Gejuchte
32c2cc33bb Improve binding patterns for arrow functions 2016-10-23 21:13:12 +02:00
Anthony Van de Gejuchte
947b8750e8 Make classes implicitly strict mode 2016-10-17 20:24:38 +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
kzc
88f6ff38d1 [ES6] fix template string escaping of \${...} 2016-10-01 11:32:36 +02:00
kzc
4198095a9c [ES6] fix parsing spread arguments that are expressions 2016-09-29 13:34:22 -04:00
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
Anthony Van de Gejuchte
13ed445607 Improve support for binding pattern 
Including improvements for parameters, variable assignment and
catch parameter.
 2016-09-05 17:48:48 +02:00
Richard van Velzen
1db50c3b16 Don't parenthesize arrow functions in parameter lists 2016-09-02 09:35:31 +02:00
kzc
25fc02743a Account for side effects in string + expr optimization 2016-09-01 09:24:56 -04:00
Richard van Velzen
7f6b5d662b Merge branch 'master' into harmony 2016-08-30 15:16:23 +02:00
kzc
0bd8053524 implement optimization: (x = 2 * x) ---> (x *= 2) 2016-08-30 08:43:02 -04:00
Anthony Van de Gejuchte
1c15d0db45 Fix quoting of properties 
- Make AST_ConciseMethod child of AST_ObjectProperty.
- Fix some typos.
 2016-08-26 15:06:24 +02:00
Richard van Velzen
45d81f881b Merge branch 'master' into harmony 2016-08-17 20:21:38 +02:00
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
Richard van Velzen
8c7d23dfb1 Merge branch 'master' into harmony 2016-08-17 08:50:31 +02:00
kzc
d854523783 Fix negate_iife regression #1254 2016-08-17 01:29:34 -04:00