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reduce AST_ForIn gracefully (#4087)

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This commit is contained in:
Alex Lam S.L
2020-09-02 01:51:43 +01:00
committed by GitHub
parent 83a3cbf151
commit 2f0da2ff05
1 changed files with 10 additions and 11 deletions
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21
test/reduce.js
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@@ -112,19 +112,18 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
// no structural AST changes before this point.
if (node.start._permute >= REPLACEMENTS.length) return;
if (parent instanceof U.AST_Assign
&& parent.left === node
|| parent instanceof U.AST_Unary
&& parent.expression === node
&& ["++", "--", "delete"].indexOf(parent.operator) >= 0) {
// ignore lvalues
// ignore lvalues
if (parent instanceof U.AST_Assign && parent.left === node) return;
if (parent instanceof U.AST_Unary && parent.expression === node) switch (parent.operator) {
case "++":
case "--":
case "delete":
return;
}
if ((parent instanceof U.AST_For || parent instanceof U.AST_ForIn)
&& parent.init === node && node instanceof U.AST_Var) {
// preserve for (var ...)
return node;
}
// preserve for (var xxx; ...)
if (parent instanceof U.AST_For && parent.init === node && node instanceof U.AST_Var) return node;
// preserve for (xxx in ...)
if (parent instanceof U.AST_ForIn && parent.init === node) return node;
// node specific permutations with no parent logic