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Compress code passed to new Function if it's a constant.

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Only for `--unsafe`.

Close #203
This commit is contained in:
Mihai Bazon
2013-05-14 10:47:06 +03:00
parent d56ebd7d7b
commit f64539fb76
2 changed files with 39 additions and 1 deletions
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39
lib/compress.js
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@@ -1589,6 +1589,45 @@ merge(Compressor.prototype, {
operator: "+",
right: make_node(AST_String, self, { value: "" })
});
case "Function":
if (self.args[self.args.length - 1] instanceof AST_String) {
// quite a corner-case, but we can handle it:
// https://github.com/mishoo/UglifyJS2/issues/203
// if the code argument is a constant, then we can minify it.
try {
var code = "(function(" + self.args.slice(0, -1).map(function(arg){
return arg.value;
}).join(",") + "){" + self.args[self.args.length - 1].value + "})()";
var ast = parse(code);
ast.figure_out_scope();
var comp = new Compressor(compressor.options);
ast = ast.transform(comp);
ast.figure_out_scope();
ast.mangle_names();
var fun = ast.body[0].body.expression;
var args = fun.argnames.map(function(arg, i){
return make_node(AST_String, self.args[i], {
value: arg.print_to_string()
});
});
var code = OutputStream();
AST_BlockStatement.prototype._codegen.call(fun, fun, code);
code = code.toString().replace(/^\{|\}$/g, "");
args.push(make_node(AST_String, self.args[self.args.length - 1], {
value: code
}));
self.args = args;
return self;
} catch(ex) {
if (ex instanceof JS_Parse_Error) {
compressor.warn("Error parsing code passed to new Function [{file}:{line},{col}]", self.args[self.args.length - 1].start);
compressor.warn(ex.toString());
} else {
console.log(ex);
}
}
}
break;
}
}
else if (exp instanceof AST_Dot && exp.property == "toString" && self.args.length == 0) {