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don't change order in binary expressions if both operands have side effects

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Mihai Bazon
2012-11-13 14:32:07 +02:00
parent a9fa178f86
commit e02771a5f2
1 changed files with 23 additions and 9 deletions
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32
lib/compress.js
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@@ -554,12 +554,24 @@ merge(Compressor.prototype, {
def(AST_UnaryPrefix, function(){
return this.operator == "typeof";
});
def(AST_Binary, function(){
def(AST_Binary, function(compressor){
return this.operator == "+" &&
(this.left.is_string() || this.right.is_string());
(this.left.is_string(compressor) || this.right.is_string(compressor));
});
def(AST_Assign, function(){
return this.operator == "=" && this.right.is_string();
def(AST_Assign, function(compressor){
return (this.operator == "=" || this.operator == "+=") && this.right.is_string(compressor);
});
def(AST_Seq, function(compressor){
return this.cdr.is_string(compressor);
});
def(AST_Conditional, function(compressor){
return this.consequent.is_string(compressor) && this.alternative.is_string(compressor);
});
def(AST_Call, function(compressor){
return compressor.option("unsafe")
&& this.expression instanceof AST_SymbolRef
&& this.expression.name == "String"
&& this.expression.undeclared();
});
})(function(node, func){
node.DEFMETHOD("is_string", func);
@@ -1549,10 +1561,12 @@ merge(Compressor.prototype, {
OPT(AST_Binary, function(self, compressor){
function reverse(op) {
if (op) self.operator = op;
var tmp = self.left;
self.left = self.right;
self.right = tmp;
if (!(self.left.has_side_effects() && self.right.has_side_effects())) {
if (op) self.operator = op;
var tmp = self.left;
self.left = self.right;
self.right = tmp;
}
};
if (commutativeOperators(self.operator)) {
if (self.right instanceof AST_Constant
@@ -1564,7 +1578,7 @@ merge(Compressor.prototype, {
if (compressor.option("comparisons")) switch (self.operator) {
case "===":
case "!==":
if ((self.left.is_string() && self.right.is_string()) ||
if ((self.left.is_string(compressor) && self.right.is_string(compressor)) ||
(self.left.is_boolean() && self.right.is_boolean())) {
self.operator = self.operator.substr(0, 2);
}