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enhance evaluate #3339

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merged 1 commit into from
Mar 14, 2019
Merged

enhance evaluate #3339

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24 changes: 15 additions & 9 deletions lib/compress.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2727,19 +2727,25 @@ merge(Compressor.prototype, {
return typeof function(){};
}
if (!non_converting_unary[this.operator]) depth++;
e = e._eval(compressor, cached, depth);
if (e === this.expression) return this;
var v = e._eval(compressor, cached, depth);
if (v === this.expression) return this;
switch (this.operator) {
case "!": return !e;
case "!": return !v;
case "typeof":
// typeof <RegExp> returns "object" or "function" on different platforms
// so cannot evaluate reliably
if (e instanceof RegExp) return this;
return typeof e;
case "void": return void e;
case "~": return ~e;
case "-": return -e;
case "+": return +e;
if (v instanceof RegExp) return this;
return typeof v;
case "void": return void v;
case "~": return ~v;
case "-": return -v;
case "+": return +v;
case "++":
case "--":
if (e instanceof AST_SymbolRef) {
var refs = e.definition().references;
if (refs[refs.length - 1] === e) return v;
}
}
return this;
});
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2 changes: 1 addition & 1 deletion test/compress/collapse_vars.js
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Original file line number Diff line number Diff line change
Expand Up @@ -947,7 +947,7 @@ collapse_vars_misc1: {
function f8() { var b = window.a * window.z; return b + (b + 5) }
function f9() { var b = window.a * window.z; return bar() || b }
function f10(x) { var a = 5; return a += 3; }
function f11(x) { var a = 5, b = 3; return a += --b; }
function f11(x) { var a = 5; return a += 2; }
}
}

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