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Support mangling toplevel names

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Close #127
This commit is contained in:
Mihai Bazon
2013-03-13 09:44:06 +02:00
parent e4b078cff7
commit 9b1a40dfc3
2 changed files with 18 additions and 10 deletions
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19
README.md
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@@ -141,12 +141,19 @@ input files from the command line.
## Mangler options ## Mangler options
To enable the mangler you need to pass `--mangle` (`-m`). Optionally you To enable the mangler you need to pass `--mangle` (`-m`). The following
can pass `-m sort=true` (we'll possibly have other flags in the future) in order (comma-separated) options are supported:
to assign shorter names to most frequently used variables. This saves a few
hundred bytes on jQuery before gzip, but the output is _bigger_ after gzip - `sort` — to assign shorter names to most frequently used variables. This
(and seems to happen for other libraries I tried it on) therefore it's not saves a few hundred bytes on jQuery before gzip, but the output is
enabled by default. _bigger_ after gzip (and seems to happen for other libraries I tried it
on) therefore it's not enabled by default.
- `toplevel` — mangle names declared in the toplevel scope (disabled by
default).
- `eval` — mangle names visible in scopes where `eval` or `when` are used
(disabled by default).
When mangling is enabled but you want to prevent certain names from being When mangling is enabled but you want to prevent certain names from being
mangled, you can declare those names with `--reserved` (`-r`) — pass a mangled, you can declare those names with `--reserved` (`-r`) — pass a

5
lib/scope.js
View File

@@ -57,7 +57,7 @@ function SymbolDef(scope, index, orig) {
SymbolDef.prototype = { SymbolDef.prototype = {
unmangleable: function(options) { unmangleable: function(options) {
return this.global return (this.global && !(options && options.toplevel))
|| this.undeclared || this.undeclared
|| (!(options && options.eval) && (this.scope.uses_eval || this.scope.uses_with)); || (!(options && options.eval) && (this.scope.uses_eval || this.scope.uses_with));
}, },
@@ -348,7 +348,8 @@ AST_Toplevel.DEFMETHOD("_default_mangler_options", function(options){
return defaults(options, { return defaults(options, {
except : [], except : [],
eval : false, eval : false,
sort : false sort : false,
toplevel : false
}); });
}); });