- use a single AST_Toplevel node for all files
- keep original source filename in the tokens

because https://github.com/mishoo/UglifyJS2/commit/43fd45154bac89b89330e13bd1f167e2a927a23c#comm...

if undefined is defined, ;-), we replace AST_Undefined nodes to a reference
to the "undefined" v...

optimizations of if/return/continue seem to be even better now

if (foo) continue;
...body...

==>

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

Only when the parent block is the...

var XXX;
for (var YYY; ...)

==>

for (var XXX,YYY; ...)

shortened to x === void 0 (or x === [][0] in unsafe mode)

when unsafe, compress undefined as [][0]

function f() {
if (foo) return x();
if (!bar) return y();
}

==>

function f() {
return fo...

- a = a + x ==> a+=x
- joining consecutive var statements (hoisting is not always desirable)
- x...

- do multiple passes in tighten_body if it was changed
- transform if (foo) return x; return y; ...

prefer to always use > and >= operators (idea from Closure)

- all symbols now have a `thedef` property which is a SymbolDef object,
instead of the `uniq` ...

- discard statements with no side effects (unsafe? could be)
- safer hoist_vars (needs some reva...

( v1 report: https://github.com/mishoo/UglifyJS/pull/458 )

a few more tests and some cleanups.

and finally it seems we beat v1 in terms of compression

The following nodes were instances of AST_BlockStatement: AST_Scope,
AST_SwitchBlock, AST_Switch...

optimize away while(false), and transform while(true) ==> for(;;).

UNSAFE:

some expressions ar...

(XXX: should add tests before anything else)

This fixes output for:

if (foo) {
moo: if (bar) {
break moo;
}
...

replace nodes with a single statement.

looks stable for now, though mess begins to sink in. nee...

Revert "minor perf. improvements"

This reverts commit 24bfd55a22afd791d4a97694641831cfbd27fb14.
...

plugged in @fitzgen's source-map library

[1,,2,] ==> [1,,2] instead of [1,undefined,2]

if (foo) {
with (bar)
if (baz)
x();
} else y();

(the compressor removes the bracket...

the statements if, for, do, while and with might have an AST_EmptyStatement
as body; if that's t...

(moved pretty much everything that relates to scope in scope.js, added a
module for NodeJS that ...

(they can't be handled the same way as variables in a scope)

- added walker for AST_ObjectProperty
- handle redefinitions properly (only mangle one symbol, m...

who would have thought that str.charAt(str.length - 1) is not a constant,
instant operation? se...