JoBoEVD/UglifyJS
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255 Commits

Author SHA1 Message Date
Richard van Velzen
f96f796f71 Add simple optimization for empty-string concats. 
ref. #43
 2012-11-12 15:41:03 +01:00
Mihai Bazon
53355bdb24 fix invalid AST produced by dropping unused variable 
close #44
 2012-11-12 13:23:57 +02:00
Dan Wolff
b49230ab8d convert x.toString() to ""+x instead of x+"" 
In some places this can save one byte in whitespace, e.g. after return.
Example:

function f(arg) {
        // return""+arg - no space between return and ""
        return arg.toString();
}
 2012-11-11 15:53:34 +02:00
Mihai Bazon
1e5e13ed81 AST_LabelRef no longer inherits from AST_SymbolRef 2012-11-08 15:39:14 +02:00
Mihai Bazon
e312c5c2a7 fix API breakage 
close #36, #38
 2012-11-08 12:31:28 +02:00
Mihai Bazon
1a5fd3e052 optimization for if/break as first statement in a loop body 
for(...; x; ...) if (y) break; → for(...; x&&!y; ...);

similarly for `while` and some combinations (i.e. the `break` appears in the
`else` clause, etc.)
 2012-11-08 11:43:14 +02:00
Mihai Bazon
46be3f2bf1 fix another small regression 
we do need parens here: `new (foo.bar().baz)`, but not here: `new foo.bar.baz`
 2012-11-07 13:31:43 +02:00
Mihai Bazon
80da21dab4 fix regression from 5346fb94 (shouldn't parenthesize i++ in x[i++]) 2012-11-07 13:02:51 +02:00
Mihai Bazon
5276a4a873 add AST_Accessor and AST_SymbolAccessor node types 
AST_Accessor will represent the function for a setter or getter.  Since they
are not mangleable, and they should not introduce a name in scope, we have a
new node for their name (AST_SymbolAccessor) which doesn't inherit from
AST_SymbolDeclaration.

fix #37
 2012-11-07 12:43:27 +02:00
Mihai Bazon
a1ae0c8609 parenthesize property access when it's the expression in New 
refs #35
 2012-11-07 12:26:33 +02:00
Mihai Bazon
a90c1aeafe further fix for parens around New (refs #35) 2012-11-07 11:49:06 +02:00
Mihai Bazon
ff388a8d2d parenthesize a Call expression when its parent is New 
fix #35
 2012-11-07 11:36:15 +02:00
Mihai Bazon
5346fb94bb add proper parens around unary expressions 
fix #34
 2012-11-07 11:23:50 +02:00
Mihai Bazon
a4f6d46118 add option to mangle names even if eval/with is in use 
(for more fair comparison to Closure compiler)
 2012-11-06 18:19:51 +02:00
Mihai Bazon
ffccb233e5 convert while into for 2012-11-05 16:01:20 +02:00
Mihai Bazon
fba0c1aafe minor 2012-11-05 16:01:09 +02:00
Mihai Bazon
774f2ded94 minor optimization 
for `==` or `!=` against a constant, prefer to display the constant first.
should help a bit after gzip, i.e.:

    typeof foo=="undefined"
    ^^^^^^    ^^^^^^^^^^^^^

vs:

    "undefined"==typeof foo
    ^^^^^^^^^^^^^^^^^^^     (longer sequence that could repeat)

idea stolen from closure.
 2012-11-05 13:13:06 +02:00
Mihai Bazon
85af942d64 print final semicolon 
close #28
 2012-11-05 13:09:39 +02:00
Mihai Bazon
8413787efc use a Dictionary object instead of plain object for hashes 
to mitigate the `__proto__` issue

related to #30
 2012-11-02 10:58:45 +02:00
Mihai Bazon
cf409800be it's safe to negate expression in !EXP only in boolean context 
#kendo
 2012-11-01 15:49:05 +02:00
Mihai Bazon
18270dd9f3 added unsafe_comps for negating <= with > 
since it has the potential to break code, let's keep it disabled by default
 2012-11-01 15:14:56 +02:00
Mihai Bazon
d4c25c571b fix compressing UnaryPrefix 
only try negating the expression if the operator is `!`

#kendo
 2012-11-01 13:35:08 +02:00
Mihai Bazon
abe0ebbf02 don't move expressions containing the binary in operator into the for initializer 
(opera can't parse it)

close #25
 2012-10-30 14:50:47 +02:00
Mihai Bazon
cb3cafa14d cripple scope to make IE happy :-( 
close #24
 2012-10-25 18:52:35 +03:00
Mihai Bazon
70fd2b1f33 fix for if (...) return; else return ...; 
(it was assumed that the first `return` always contains a value)

close #22
 2012-10-24 09:33:32 +03:00
Mihai Bazon
30faaf13ed more sequence optimizations (lift some sequences above binary/unary expressions so that we can avoid parens) 2012-10-22 11:58:06 +03:00
Mihai Bazon
fc8314e810 minor fix for dropping unused definitions. 
function f(x, y) {
        var g = function() { return h() };
        var h = function() { return g() };
        return x + y;
    }

now compresses to `function f(x, y) { return x + y }`
 2012-10-19 12:57:29 +03:00
Mihai Bazon
afb7faa6fa more optimizations for some break/continue cases 2012-10-18 15:14:57 +03:00
Mihai Bazon
253bd8559b more small optimizations 
(unlikely to help for hand-written code)
 2012-10-17 21:57:08 +03:00
Mihai Bazon
6a099fba66 define aborts on AST_If: true if both branches abort 2012-10-17 16:17:14 +03:00
Mihai Bazon
a21f3c6cdd employ a better parser for command-line arguments 
to support passing commas in strings in for example:

    uglifyjs2 -cd TEST="'a,b'" <<EOF
    console.log(TEST);
    EOF

    → console.log("a,b")

close #14
 2012-10-17 15:56:45 +03:00
Mihai Bazon
8f66458598 the sort option is broken anyway, removed it 
we need to mangle names from outermost to innermost scope; mangling names
from inner scopes before we got to the outer scope won't work correctly,
therefore sorting doesn't make sense.
 2012-10-17 15:24:47 +03:00
Mihai Bazon
6472f9410e add semicolons option in the code generator (default: true) 
pass `false` to separate statements with newlines instead of semicolons
 2012-10-17 14:52:08 +03:00
Mihai Bazon
8957b3a694 fix small glitches in source map generation 2012-10-16 15:54:12 +03:00
Mihai Bazon
fcc0229087 drop unused function arguments 
also add test for "drop_unused" (the last one fails for now)
 2012-10-13 15:04:44 +03:00
Mihai Bazon
b071c9d079 add parens to AST_Seq whose parent is AST_Unary 2012-10-13 14:32:08 +03:00
Mihai Bazon
851b48e4a3 fix compressing benchmark.js (it tried to evaluate a statement) 
the following code in benchmark.js triggered the issue:

    support.decompilation = Function(
      'return (' + (function(x) { return { 'x': '' + (1 + x) + '', 'y': 0 }; }) + ')'
    )()(0).x === '1';

technically that could be resolved into a constant expression, but seems
it's being used here for browser bugs detection :-\
 2012-10-13 12:57:10 +03:00
Mihai Bazon
708abb1ab1 minor 2012-10-13 12:42:01 +03:00
Mihai Bazon
370d3e0917 fix regression from fb5c01c073 
is_digit takes a char code now, not a string
 2012-10-13 12:24:27 +03:00
Mihai Bazon
b51fe0dcc3 fix end tokens in spidermonkey ast import 2012-10-13 11:37:58 +03:00
Mihai Bazon
8149be551e minor 2012-10-12 14:55:54 +03:00
Mihai Bazon
1b6f8d463f remove the $self hack 
operations are destructive anyway, so there's no point to clone the nodes in
the transformer.  speed++
 2012-10-12 11:07:35 +03:00
Mihai Bazon
72cb5328ee fix in_boolean_context() (two tests were broken) 2012-10-12 10:49:41 +03:00
Mihai Bazon
fc39553714 use AST_Lambda for object setters/getters 
so that the optimization that drops the name if unused doesn't apply.
close #12
 2012-10-12 10:11:01 +03:00
Mihai Bazon
d9d67317b1 fix pos in syntax error exception 2012-10-11 15:25:38 +03:00
Mihai Bazon
fb5c01c073 stealing more hacks from acorn in the name of speed 2012-10-11 15:17:42 +03:00
Mihai Bazon
f4584af42c using makeComparator from acorn to generate functions that tests whether a 
string is keyword, reserved etc.

speeds up the parser a bit, though not spectacular.. still far from acorn.
 2012-10-11 11:52:05 +03:00
Mihai Bazon
172aa7a93c cleanup 
- use prototype-less objects where feasible (minor speed improvement)
- get rid of HOP
 2012-10-11 11:07:42 +03:00
Mihai Bazon
5053a29bc0 fix propagation of symbol references 2012-10-11 10:28:48 +03:00
Mihai Bazon
9cdaed9860 fix node name 2012-10-10 23:16:40 +03:00
Mihai Bazon
dacce1b1fa seems cleaner if AST_Label doesn't inherit from AST_SymbolDeclaration 2012-10-10 11:37:51 +03:00
Mihai Bazon
f26f3b44bc small improvements in wrap_commonjs: 
- use MAP.splice instead of a BlockStatement to inject code (avoids some
  warnings in the linter)
- use the original symbol in exports, so that we get the proper source mapping
 2012-10-10 11:28:05 +03:00
Mihai Bazon
c5ecbfc756 drop unused variable 2012-10-10 11:27:06 +03:00
Mihai Bazon
3799ac8973 add --lint and display {file} in scope_warnings 2012-10-10 11:26:59 +03:00
Mihai Bazon
86182afa7f minor 2012-10-09 22:56:59 +03:00
Mihai Bazon
a84d07e312 add AST_Infinity node 2012-10-09 18:35:53 +03:00
Mihai Bazon
88beddfa91 make --comments keep @cc_on too 2012-10-09 18:25:00 +03:00
Mihai Bazon
1b0aab2ce9 added $propdoc to AST nodes and some cleanups 
hopefully we can make the AST documentation self-generating
 2012-10-09 18:20:39 +03:00
Mihai Bazon
9ead49641d minor AST cleanup (AST_BlockStatement may inherit from AST_Block) 2012-10-09 13:59:17 +03:00
Mihai Bazon
e1862cd36f add --ast-help 
displays a rather cruel description of the AST classes, derived
directly from the node definitions.
 2012-10-09 13:21:21 +03:00
Mihai Bazon
2c025f23db fix detecting symbols in use 2012-10-09 13:13:55 +03:00
Mihai Bazon
d4970b35ac should not expose base54.sort() in the API docs, I think 2012-10-08 13:37:27 +03:00
Mihai Bazon
dd8286bce1 added --self to easily get a browser-runnable version of UglifyJS 2012-10-08 12:55:18 +03:00
Mihai Bazon
093a9031dc eliminate redundant directives in the same scope 2012-10-08 12:53:17 +03:00
Mihai Bazon
80a18fe2fa for certain nodes that we invent we might not have a original source file to 
map from, so just use "?".  and in any case, don't fail hard when addMapping throws.
 2012-10-08 12:52:25 +03:00
Mihai Bazon
455ac5435d remove unused code 2012-10-05 22:59:05 +03:00
Mihai Bazon
4a2b91220a minor 2012-10-05 20:24:56 +03:00
Mihai Bazon
a1e0885930 replace (function(){ ...no side effects ... })() with undefined. 2012-10-05 16:51:16 +03:00
Mihai Bazon
7ae09120ed prevent mangling only when eval is *called*, not when it's just referenced 2012-10-05 16:17:31 +03:00
Mihai Bazon
ecd9f21467 fixed import of locations from SpiderMonkey AST 2012-10-05 15:05:06 +03:00
Mihai Bazon
a9b6f9909a use the appropriate constructor for symbols 2012-10-04 17:28:35 +03:00
Mihai Bazon
708ec0467c minor 2012-10-04 17:28:09 +03:00
Mihai Bazon
682a58a1f5 removed some unused variables 2012-10-04 08:49:18 +03:00
Mihai Bazon
f20c251882 moving code around 2012-10-03 21:39:47 +03:00
Mihai Bazon
2bd8a118c2 define AST_Node.from_mozilla_ast(ast) 
returns an UglifyJS2 AST given a Mozilla AST.  Still needs some work to do
(need to create specific nodes like AST_SymbolRef, AST_SymbolLambda
etc. instead of base AST_Symbol, in order for the mangler/compressor to work
properly)
 2012-10-03 20:03:17 +03:00
Mihai Bazon
11863d6f9a more cleanup (dropped AST_SwitchBlock) 2012-10-03 15:52:31 +03:00
Mihai Bazon
3412498795 AST cleanup (dropped AST_StatementBase) 2012-10-03 15:41:11 +03:00
Mihai Bazon
c11de17e99 added option for side-effect-free statements, fix test 2012-10-03 13:08:03 +03:00
Mihai Bazon
e0f5075e45 fix endless loop in tests 2012-10-03 12:49:47 +03:00
Mihai Bazon
0678ae2076 fix for a = !b && !c && !d && !e → a=!(b||c||d||e) 2012-10-03 11:34:05 +03:00
Mihai Bazon
378ed17809 disable hoist_vars by default and change comparations to comparisons 2012-10-03 11:27:05 +03:00
Mihai Bazon
815abcfe18 support for --comments option to keep comments containing @license or @preserve 2012-10-02 16:40:42 +03:00
Mihai Bazon
075f93ec0d line numbers start at 1 2012-10-02 16:39:53 +03:00
Mihai Bazon
2a5456260e added option to keep some comments in the output 2012-10-02 14:32:30 +03:00
Mihai Bazon
36be211e99 option to exclude certain names from mangling 2012-10-02 14:02:33 +03:00
Mihai Bazon
dde5b22b5e support defines 2012-10-02 13:20:07 +03:00
Mihai Bazon
e1098b04a7 "use strict"; 2012-10-02 12:45:58 +03:00
Mihai Bazon
211792757c more constant folding (for names defined with const) 2012-10-02 12:45:17 +03:00
Mihai Bazon
347160c631 add AST_SymbolConst for names defined with const 2012-10-02 12:22:39 +03:00
Mihai Bazon
ff696cd7bc drop more unused names 2012-10-02 12:02:33 +03:00
Mihai Bazon
9e5dd81f1e a shy attempt to obey width in the beautifier; added bracketize option to always print brackets around if/do/while/for statements; export more options via the CLI 2012-10-02 11:22:38 +03:00
Mihai Bazon
896444482a minor 2012-09-28 11:12:47 +03:00
Mihai Bazon
05e15b1c0c fix mangling 
(bug in our code prevented the mangler from using a name that was in use
prior to mangling but not after it)
 2012-09-27 00:01:16 +03:00
Mihai Bazon
13278c6649 removed the "squeeze" method (it's now effectively "transform") 2012-09-26 19:52:32 +03:00
Mihai Bazon
15d58f5917 some speedup and more savings from unused vars that have side effects in initialization 2012-09-26 19:05:49 +03:00
Mihai Bazon
78be8f5296 compressor successfully moved to TreeTransformer 2012-09-26 14:27:01 +03:00
Mihai Bazon
a24e7ee976 checkpoint (refactoring, WIP) 2012-09-26 12:16:16 +03:00
Mihai Bazon
242dd10131 more cleanups 2012-09-25 20:39:15 +03:00
Mihai Bazon
9321d418bc moving code around (refactoring, WIP) 2012-09-25 15:59:27 +03:00
Mihai Bazon
10c7f52074 discard all \uFEFF characters (https://github.com/mishoo/UglifyJS/issues/462) 2012-09-25 15:30:59 +03:00