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Fixed typeof undefined optimization and updated related test case to

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accomodates the sort behaviour changes made in commit
mishoo/UglifyJS2@aebafad41e.
Signed-off-by: Justin Lau <justin@tclau.com>
This commit is contained in:
Justin Lau
2013-05-05 20:38:32 +08:00
committed by Mihai Bazon
parent 672699613e
commit a1958aad56
2 changed files with 10 additions and 11 deletions
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16
lib/compress.js
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@@ -1751,14 +1751,14 @@ merge(Compressor.prototype, {
// XXX: intentionally falling down to the next case
case "==":
case "!=":
if (self.left instanceof AST_String
&& self.left.value == "undefined"
&& self.right instanceof AST_UnaryPrefix
&& self.right.operator == "typeof"
&& compressor.option("unsafe")) {
if (!(self.right.expression instanceof AST_SymbolRef)
|| !self.right.expression.undeclared()) {
self.left = self.right.expression;
if (compressor.option("unsafe")
&& self.left instanceof AST_UnaryPrefix
&& self.left.operator == "typeof"
&& self.right instanceof AST_String
&& self.right.value == "undefined") {
if (!(self.left.expression instanceof AST_SymbolRef)
|| !self.left.expression.undeclared()) {
self.left = self.left.expression;
self.right = make_node(AST_Undefined, self.left).optimize(compressor);
if (self.operator.length == 2) self.operator += "=";
}

5
test/compress/issue-105.js
View File

@@ -1,10 +1,9 @@
typeof_eq_undefined: {
options = {
comparisons: true,
unsafe: false
comparisons: true
};
input: { a = typeof b.c != "undefined" }
expect: { a = "undefined" != typeof b.c }
expect: { a = typeof b.c != "undefined" }
}
typeof_eq_undefined_unsafe: {