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Add option keep_fargs.

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By default it's `false`.  Pass `true` if you need to keep unused function
arguments.

Close #188.
This commit is contained in:
Mihai Bazon
2014-02-08 12:33:56 +02:00
parent 1a4440080d
commit ef2ef07cbd
1 changed files with 14 additions and 11 deletions
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25
lib/compress.js
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@@ -61,6 +61,7 @@ function Compressor(options, false_by_default) {
loops : !false_by_default, loops : !false_by_default,
unused : !false_by_default, unused : !false_by_default,
hoist_funs : !false_by_default, hoist_funs : !false_by_default,
keep_fargs : false,
hoist_vars : false, hoist_vars : false,
if_return : !false_by_default, if_return : !false_by_default,
join_vars : !false_by_default, join_vars : !false_by_default,
@@ -1044,18 +1045,20 @@ merge(Compressor.prototype, {
var tt = new TreeTransformer( var tt = new TreeTransformer(
function before(node, descend, in_list) { function before(node, descend, in_list) {
if (node instanceof AST_Lambda && !(node instanceof AST_Accessor)) { if (node instanceof AST_Lambda && !(node instanceof AST_Accessor)) {
for (var a = node.argnames, i = a.length; --i >= 0;) { if (!compressor.option("keep_fargs")) {
var sym = a[i]; for (var a = node.argnames, i = a.length; --i >= 0;) {
if (sym.unreferenced()) { var sym = a[i];
a.pop(); if (sym.unreferenced()) {
compressor.warn("Dropping unused function argument {name} [{file}:{line},{col}]", { a.pop();
name : sym.name, compressor.warn("Dropping unused function argument {name} [{file}:{line},{col}]", {
file : sym.start.file, name : sym.name,
line : sym.start.line, file : sym.start.file,
col : sym.start.col line : sym.start.line,
}); col : sym.start.col
});
}
else break;
} }
else break;
} }
} }
if (node instanceof AST_Defun && node !== self) { if (node instanceof AST_Defun && node !== self) {