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1374 Commits

Author SHA1 Message Date
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
Mihai Bazon
4201577dd7 started some refactoring (WIP) -- moving squeezer to TreeTransformer 2012-09-25 15:15:47 +03:00
Mihai Bazon
e836e2ae5f minor 2012-09-25 12:48:36 +03:00
Mihai Bazon
ea6d1ea701 it's not safe to assume that property access is side-effect-free 
(getters/setters + various browser bugs will trigger side effects; also, an
exception is thrown when the expression is undefined)
 2012-09-25 10:32:14 +03:00
Mihai Bazon
368ac8f93c some boolean cleanup 2012-09-25 10:31:03 +03:00
Mihai Bazon
42038fd67f Support input source map 
This is useful while compressing generated code; for example compressing JS
compiled by CoffeeScript (assuming you got a source map):

    uglifyjs2 --in-source-map generated.js.map \
              --source-map uglified.js.map \
              -o uglified.js

The above assumes you have a "generated.js.map" file which is the source
mapping between your CoffeeScript and the generated.js (compiled output from
CoffeeScript).  The name of the input file is not present in this example;
it will be fetched from the source map (but it can be passed manually too).

The output will be in "uglified.js" and the output map "uglified.js.map"
will actually map to the original CoffeeScript code, rather than to
generated.js.
 2012-09-24 17:02:18 +03:00
Mihai Bazon
a83b28503f properly drop mutually-referring declarations that are not otherwise 
referenced and have no side effects
 2012-09-23 12:47:34 +03:00
Mihai Bazon
76d88b59dc tree transformer api (WIP) 2012-09-22 19:41:09 +03:00
Mihai Bazon
ec7f895b54 log filename in parse errors / compressor warnings 2012-09-21 14:44:25 +03:00
Mihai Bazon
5491e1d7b1 better support for multiple input files: 
- use a single AST_Toplevel node for all files
- keep original source filename in the tokens
 2012-09-21 14:19:05 +03:00
Mihai Bazon
c4f8c2103f more on detecting side effects 2012-09-21 11:23:44 +03:00
Mihai Bazon
e8da72d304 drop unused variables 2012-09-19 12:27:38 +03:00
Mihai Bazon
a4d2340c73 fixed label scope/mangling 2012-09-18 19:26:46 +03:00
Mihai Bazon
669874d46b minor 2012-09-18 14:17:23 +03:00
Mihai Bazon
3da0ac4897 support for directives 2012-09-18 13:21:09 +03:00
Mihai Bazon
21968285e8 added AST_NaN (output as 0/0) 2012-09-18 10:53:46 +03:00
Mihai Bazon
d91613b4a8 only do the typeof x == "undefined" optimization if x is a symbol reference and it's declared in scope, or x is not a symbol reference. 2012-09-17 20:02:57 +03:00
Mihai Bazon
ee669ba878 moved typeof foo == "undefined" ==> foo === undefined under --unsafe 
because 43fd45154b (commitcomment-1864505)
 2012-09-17 18:49:52 +03:00
Mihai Bazon
e370e3b5a4 fix .undeclared (it's now a function) 2012-09-17 15:06:06 +03:00
Mihai Bazon
6ad414ef28 minor 2012-09-17 14:33:36 +03:00
Mihai Bazon
92e22c460d possible optimization for AST_Undefined 
if undefined is defined, ;-), we replace AST_Undefined nodes to a reference
to the "undefined" variable; in turn the mangler will compress it to a
single letter; this helps at least on jQuery.
 2012-09-17 12:27:32 +03:00
Mihai Bazon
14481de0e9 empty block to empty statement: {} ==> ; 2012-09-17 12:03:02 +03:00
Mihai Bazon
07f1d56f69 more smallish optimizations 2012-09-17 11:50:35 +03:00
Mihai Bazon
5e60a60b3b try negating AST_Binary 2012-09-17 11:16:44 +03:00
Mihai Bazon
5d781ec6f8 some cleanup 2012-09-16 18:10:54 +03:00
Mihai Bazon
0f418d654e more sequencesizing (WIP) 2012-09-16 16:29:17 +03:00
Mihai Bazon
21c34a1792 drop unused function 2012-09-16 15:46:47 +03:00
Mihai Bazon
7b6a402916 rewrite handle_if_return 
optimizations of if/return/continue seem to be even better now
 2012-09-16 15:46:20 +03:00
Mihai Bazon
397bf56d25 other small optimization: 
if (foo) continue;
...body...

==>

if (!foo) { ...body ... }

Only when the parent block is the target loop of the `continue` statement.
 2012-09-15 16:10:35 +03:00
Mihai Bazon
4e0262bdfb figure out label targets 2012-09-15 16:05:17 +03:00
Mihai Bazon
86c14d0988 join_vars: 
var XXX;
for (var YYY; ...)

==>

for (var XXX,YYY; ...)
 2012-09-15 10:54:59 +03:00
Mihai Bazon
43fd45154b compress typeof x == "undefined" to x === undefined, which further gets 
shortened to x === void 0 (or x === [][0] in unsafe mode)
 2012-09-14 19:56:59 +03:00
Mihai Bazon
50d1670e42 minor 
when unsafe, compress undefined as [][0]
 2012-09-14 19:04:18 +03:00
Mihai Bazon
5e83e7ec17 adding an imaginary "return undefined" can sometimes help 
function f() {
  if (foo) return x();
  if (!bar) return y();
}

==>

function f() {
  return foo ? x() : bar ? void 0 : y();
}
 2012-09-14 16:26:30 +03:00
Mihai Bazon
924aa58060 more optimizations that v1 does and some cleanups 
- a = a + x ==> a+=x
- joining consecutive var statements (hoisting is not always desirable)
- x == false ==> x == 0, x != true ==> x != 1
- x, x ==> x; x = exp(), x ==> x = exp()
- discarding useless break-s
 2012-09-14 15:36:38 +03:00
Mihai Bazon
d72c1d1293 few more optimizations: 
- do multiple passes in tighten_body if it was changed
- transform if (foo) return x; return y; ==> return foo?x:y
- don't optimize !0 as true (use best_of after evaluation of constant expr)

With hoist_vars off we now beat UglifyJS v1 on jQuery-1.8.1
 2012-09-13 15:20:57 +03:00
Mihai Bazon
f5027ec1fc minor 2012-09-12 16:29:20 +03:00
Mihai Bazon
a132841fb9 more AST_If optimizations 2012-09-12 16:10:03 +03:00
Mihai Bazon
2b1e4628e0 side effect fixes and small optimization for gzip 
prefer to always use > and >= operators (idea from Closure)
 2012-09-12 13:41:46 +03:00
Mihai Bazon
2b4093ba83 fixed run-tests and an issue about reversing the condition in AST_If 2012-09-12 13:00:13 +03:00
Mihai Bazon
9a629abe00 minor 2012-09-11 18:37:08 +03:00
Mihai Bazon
8e82d8d94c fixed some mess with symbols/scope 
- all symbols now have a `thedef` property which is a SymbolDef object,
  instead of the `uniq` that we had before (pointing to the first occurrence
  of the name as declaration).

- for undeclared symbols we still create a SymbolDef object in the toplevel
  scope but mark it "undeclared"

- we can now call figure_out_scope after squeezing, which is useful in order
  not to mangle names that were dropped by the squeezer
 2012-09-11 15:42:28 +03:00
Mihai Bazon
da407d46c6 checkpoint 
- discard statements with no side effects (unsafe? could be)
- safer hoist_vars (needs some revamping of scope/mangling)
 2012-09-11 13:15:55 +03:00
Mihai Bazon
1579c0fb97 hoist_vars is pretty bad, it seems. cancelled it for now. 2012-09-10 22:40:18 +03:00
Mihai Bazon
6b9aeb5325 adaptive base54 digits depending on char frequency (WIP) 2012-09-10 22:29:18 +03:00
Mihai Bazon
a41e6cfabb more progress on the compressor (WIP) 2012-09-10 16:37:05 +03:00
Mihai Bazon
1c8ba35844 minor 2012-09-08 22:51:59 +03:00
Mihai Bazon
5a8e6ce735 fix output for division followed by regexp 
( v1 report: https://github.com/mishoo/UglifyJS/pull/458 )
 2012-09-08 15:38:58 +03:00
Mihai Bazon
43c75c9248 checkpoint 2012-09-07 18:55:13 +03:00
Mihai Bazon
048d6906ae fix bug (forgot arg name) 2012-09-07 16:02:08 +03:00
Mihai Bazon
919b2733ab always keep declarations found in unreachable code 
a few more tests and some cleanups.
 2012-09-07 15:18:32 +03:00
Mihai Bazon
b77574ea1c fixed tests (need to drop the toplevel block in "expected" if it's a single statement) 2012-09-07 11:22:01 +03:00
Mihai Bazon
9bb1a84d6b don't duplicate argument names 2012-09-05 18:19:30 +03:00
Mihai Bazon
c7b484b64f fix for variable names like toString 2012-09-05 14:31:05 +03:00
Mihai Bazon
0503513dcc support for hoisting declarations 
and finally it seems we beat v1 in terms of compression
 2012-09-05 13:43:34 +03:00
Mihai Bazon
8633b0073f cleaned up usage of AST_BlockStatement 
The following nodes were instances of AST_BlockStatement: AST_Scope,
AST_SwitchBlock, AST_SwitchBranch.  Also, AST_Try, AST_Catch, AST_Finally
were having a body instanceof AST_BlockStatement.

Overloading the meaning of AST_BlockStatement this way turned out to be a
mess; we now have an AST_Block class that is the base class for things
having a block of statements (might or might not be bracketed).  The
`this.body` of AST_Scope, AST_Try, AST_Catch, AST_Finally is now an array of
statements (as they inherit from AST_Block).

Avoiding calling superclass's _walk function in walkers (turns out we walked
a node multiple times).
 2012-09-05 11:39:43 +03:00
Mihai Bazon
1b5183dd5e checkpoint 2012-09-04 15:36:14 +03:00
Mihai Bazon
376667a818 more fiddling with boolean expressions, etc. 
optimize away while(false), and transform while(true) ==> for(;;).

UNSAFE:

some expressions are optimized away when we're in boolean context and can
determine that the value will always be true or false.  For example:

    x() || true ==> always `true` in boolean context
    x() && false ==> always `false` in boolean context

It's not technically correct to drop these expressions since we drop the
function call too (that might have side effects); on the other hand, I can't
see any legitimate use for such expressions and they might simply indicate a
bug (we do warn about it).
 2012-09-04 13:20:28 +03:00
Mihai Bazon
3459c40cf9 if present, the else in an if should always be forced statement 2012-09-04 13:17:13 +03:00
Mihai Bazon
86cfb5be86 boolean and if/exit optimizations 2012-09-03 23:49:57 +03:00
Mihai Bazon
e5f1cec6aa minor 2012-09-03 23:25:30 +03:00
Mihai Bazon
37eecc16a4 more optimizations for ifs/conditionals 
(XXX: should add tests before anything else)
 2012-09-03 19:38:45 +03:00
Mihai Bazon
f03138daa8 resolve constant expressions 2012-09-03 15:47:15 +03:00
Mihai Bazon
f702264617 jumps, try and definitions are statements too 2012-09-03 12:39:02 +03:00
Mihai Bazon
6d0db4ce14 an AST_If is too a StatementWithBody 2012-09-03 12:11:44 +03:00
Mihai Bazon
d7c1dc6c05 a LabeledStatement should be in fact a StatementWithBody 
This fixes output for:

    if (foo) {
        moo: if (bar) {
            break moo;
        }
    } else {
        baz();
    }

(the labeled statement must be outputted inside brackets)
 2012-09-03 12:05:10 +03:00
Mihai Bazon
66c869c8f6 switch branches must be declared required so that the compressor doesn't 
replace nodes with a single statement.

looks stable for now, though mess begins to sink in.  need to review the AST
hierarchy.
 2012-09-03 11:05:59 +03:00
Mihai Bazon
1bf5928b54 Reverting "minor perf. improvements" 
Revert "minor perf. improvements"

This reverts commit 24bfd55a22.

broke the parser somehow; too early to optimize, let's get the other stuff running.
 2012-09-03 10:26:23 +03:00
Mihai Bazon
f2f370cee3 add source mappings for more node types; started CLI utility 2012-09-02 14:32:00 +03:00
Mihai Bazon
24bfd55a22 minor perf. improvements 2012-09-02 11:11:39 +03:00
Mihai Bazon
52bcca288f started support for generating source maps (WIP) 
plugged in @fitzgen's source-map library
 2012-08-29 19:39:19 +03:00
Mihai Bazon
48440dc250 don't mangle names of setters/getters 2012-08-29 19:26:48 +03:00
Mihai Bazon
86cff2029f docstring for AST_StatementWithBody 2012-08-28 15:39:53 +03:00
Mihai Bazon
1b6bcca717 fix output for arrays containing undefined values 
[1,,2,] ==> [1,,2] instead of [1,undefined,2]
 2012-08-28 15:38:35 +03:00
Mihai Bazon
7fcb6bcb12 fix code generator for this case: 
if (foo) {
  with (bar)
    if (baz)
      x();
} else y();

(the compressor removes the brackets since the consequent consists of a
single statement, but the codegen must include the brackets because
otherwise the `else` would refer to the inner `if`)
 2012-08-28 15:29:58 +03:00
Mihai Bazon
58a3b5e93f update (c) years 2012-08-27 11:01:41 +03:00
Mihai Bazon
4437e7af19 fix compressing a,b; return c; into return a,b,c; 2012-08-27 11:00:22 +03:00
Mihai Bazon
a8e49f1536 added print_to_string helper method 2012-08-27 10:59:33 +03:00
Mihai Bazon
8d233c38d4 fix current_col and force a newline every 32K (support options.max_line_len) 2012-08-23 10:39:33 +03:00
Mihai Bazon
95b18e54a4 added license 2012-08-22 21:28:59 +03:00
Mihai Bazon
159a6f048c wrote more of the compressor and added some tests 2012-08-22 15:21:58 +03:00
Mihai Bazon
f53e139d3c fix output for certain edge cases 
the statements if, for, do, while and with might have an AST_EmptyStatement
as body; if that's the case, we need to make sure that the semicolon gets in
the output.
 2012-08-22 13:20:05 +03:00
Mihai Bazon
fb8c9e3a48 declare some properties in the node constructor so that they're copied in clone 2012-08-22 00:01:55 +03:00
Mihai Bazon
1b839eb35b hint that brackets may be required in AST_BlockStatement 2012-08-21 19:16:05 +03:00
Mihai Bazon
ffe58a9961 cleaned up some mess and started the actual compressor 2012-08-21 16:14:43 +03:00
Mihai Bazon
7ae1c600a2 some reorganization 
(moved pretty much everything that relates to scope in scope.js, added a
module for NodeJS that can be used with require() and exports everything.)
 2012-08-21 13:53:16 +03:00
Mihai Bazon
92bd53b513 handle labels properly 
(they can't be handled the same way as variables in a scope)
 2012-08-21 12:45:06 +03:00
Mihai Bazon
159333f4c5 warn about unreferenced symbols 2012-08-21 12:07:34 +03:00
Mihai Bazon
99456c6156 more fixes: 
- added walker for AST_ObjectProperty
- handle redefinitions properly (only mangle one symbol, make them all point
  to a single definition)

DynarchLIB seems to run fine after mangling + compressed output.
 2012-08-21 11:38:49 +03:00
Mihai Bazon
458e251d7e added mangler and other stuff 2012-08-20 17:32:35 +03:00
Mihai Bazon
1fe0ff9fff doc (WIP) 2012-08-20 00:35:54 +03:00
Mihai Bazon
6c35135ace simple visitor API and code to figure out scope and references 2012-08-19 15:57:50 +03:00
Mihai Bazon
4488758d48 some fixes (need testing) in AST_If codegen 2012-08-18 12:29:57 +03:00
Mihai Bazon
cd8ae5f712 minor whitespace issues 2012-08-17 23:08:09 +03:00
Mihai Bazon
ef87c9fd8f big speed improvement (observable when beautify = false) 
who would have thought that str.charAt(str.length - 1) is not a constant,
instant operation?  seems to get slower and slower as the string grows.

0.6s vs. 3s
 2012-08-17 19:04:23 +03:00
Mihai Bazon
901f77047e don't output both space and semicolon when beautify=false 2012-08-17 18:33:26 +03:00
Mihai Bazon
07cbc8d3af added some comments about the rules governing parens 2012-08-17 18:06:29 +03:00
Mihai Bazon
4fb6021b0b fix one more glitch 2012-08-17 16:27:43 +03:00
Mihai Bazon
13f7b119bb code generator finally seems to work properly 2012-08-17 15:59:42 +03:00
Mihai Bazon
c7c163b82e lots'o'fixes in the output routines; still a looong way to go. 2012-08-16 21:36:16 +03:00
Mihai Bazon
7f273c3b89 codegen and dropped the useless walker 2012-08-16 18:11:04 +03:00
Mihai Bazon
c0ba9e2986 WIP 2012-08-15 14:50:27 +03:00
Mihai Bazon
861e26a666 WIP 2012-06-03 23:10:31 +03:00
Mihai Bazon
22bb5e8306 added small node test script 2012-05-27 14:36:51 +03:00
Mihai Bazon
46e7507b44 Fixes some gotchas. 
DynarchLIB (660K) now passes parsing in 440ms (about 30% slower than the
parser in UglifyJS v1).
 2012-05-27 14:36:44 +03:00
Mihai Bazon
562b12f021 init repo 2012-05-27 14:13:26 +03:00