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minor optimization

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unlikely to help in hand-written code:

    (something() ? foo : bar) == foo  ==>  something()
This commit is contained in:
Mihai Bazon
2013-10-02 15:31:31 +03:00
parent 95b4507c02
commit 88fb83aa81
1 changed files with 26 additions and 0 deletions
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26
lib/compress.js
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@@ -1882,6 +1882,32 @@ merge(Compressor.prototype, {
// result. hence, force switch.
reverse(null, true);
}
if (/^[!=]==?$/.test(self.operator)) {
if (self.left instanceof AST_SymbolRef && self.right instanceof AST_Conditional) {
if (self.right.consequent instanceof AST_SymbolRef
&& self.right.consequent.definition() === self.left.definition()) {
if (/^==/.test(self.operator)) return self.right.condition;
if (/^!=/.test(self.operator)) return self.right.condition.negate(compressor);
}
if (self.right.alternative instanceof AST_SymbolRef
&& self.right.alternative.definition() === self.left.definition()) {
if (/^==/.test(self.operator)) return self.right.condition.negate(compressor);
if (/^!=/.test(self.operator)) return self.right.condition;
}
}
if (self.right instanceof AST_SymbolRef && self.left instanceof AST_Conditional) {
if (self.left.consequent instanceof AST_SymbolRef
&& self.left.consequent.definition() === self.right.definition()) {
if (/^==/.test(self.operator)) return self.left.condition;
if (/^!=/.test(self.operator)) return self.left.condition.negate(compressor);
}
if (self.left.alternative instanceof AST_SymbolRef
&& self.left.alternative.definition() === self.right.definition()) {
if (/^==/.test(self.operator)) return self.left.condition.negate(compressor);
if (/^!=/.test(self.operator)) return self.left.condition;
}
}
}
}
self = self.lift_sequences(compressor);
if (compressor.option("comparisons")) switch (self.operator) {