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try negating AST_Binary

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This commit is contained in:
Mihai Bazon
2012-09-17 11:16:44 +03:00
parent 5d781ec6f8
commit 5e60a60b3b
1 changed files with 14 additions and 17 deletions
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31
lib/compress.js
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@@ -187,12 +187,12 @@ function Compressor(options, false_by_default) {
if (compressor.option("dead_code")) {
statements = eliminate_dead_code(statements, compressor);
}
if (compressor.option("sequences")) {
statements = sequencesize(statements, compressor);
}
if (compressor.option("if_return")) {
statements = handle_if_return(statements, compressor);
}
if (compressor.option("sequences")) {
statements = sequencesize(statements, compressor);
}
if (compressor.option("join_vars")) {
statements = join_consecutive_vars(statements, compressor);
}
@@ -620,6 +620,9 @@ function Compressor(options, false_by_default) {
def(AST_Statement, function(){
throw new Error("Cannot negate a statement");
});
def(AST_Function, function(){
return basic_negation(this);
});
def(AST_UnaryPrefix, function(){
if (this.operator == "!")
return this.expression;
@@ -664,7 +667,7 @@ function Compressor(options, false_by_default) {
});
})(function(node, func){
node.DEFMETHOD("negate", function(compressor){
return func.call(this, compressor).optimize(compressor);
return func.call(this, compressor);
});
});
@@ -1372,19 +1375,6 @@ function Compressor(options, false_by_default) {
if (this.operator.length == 2) this.operator += "=";
}
break;
case "&&":
case "||":
if (this.left instanceof AST_UnaryPrefix && this.left.operator == "!"
&& this.right instanceof AST_UnaryPrefix && this.right.operator == "!") {
this.left = this.left.expression;
this.right = this.right.expression;
this.operator = this.operator == "&&" ? "||" : "&&";
return make_node(AST_UnaryPrefix, this, {
operator: "!",
expression: this
}).optimize(compressor);
}
break;
}
if (compressor.option("booleans") && compressor.in_boolean_context()) switch (this.operator) {
case "&&":
@@ -1469,6 +1459,13 @@ function Compressor(options, false_by_default) {
case "<": reverse(">"); break;
case "<=": reverse(">="); break;
}
if (!(compressor.parent() instanceof AST_Binary)) {
var negated = make_node(AST_UnaryPrefix, self, {
operator: "!",
expression: self.negate(compressor)
});
self = best_of(self, negated);
}
}
return self;
});