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2360 Commits

Author SHA1 Message Date
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