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support destructured literals (#4278)

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This commit is contained in:
Alex Lam S.L
2020-11-17 00:01:24 +00:00
committed by GitHub
parent 42e34c870a
commit e5f80afc53
10 changed files with 2477 additions and 305 deletions
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32
test/reduce.js
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@@ -95,6 +95,7 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
// quick ignores
if (node instanceof U.AST_Accessor) return;
if (node instanceof U.AST_Destructured) return;
if (node instanceof U.AST_Directive) return;
if (!in_list && node instanceof U.AST_EmptyStatement) return;
if (node instanceof U.AST_Label) return;
@@ -114,6 +115,8 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
// ignore lvalues
if (parent instanceof U.AST_Assign && parent.left === node) return;
if (parent instanceof U.AST_Destructured) return;
if (parent instanceof U.AST_DestructuredKeyVal && parent.value === node) return;
if (parent instanceof U.AST_Unary && parent.expression === node) switch (parent.operator) {
case "++":
case "--":
@@ -250,13 +253,23 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
}
}
else if (node instanceof U.AST_ForIn) {
var expr = [
node.init,
node.object,
node.body,
][ (node.start._permute * steps | 0) % 3 ];
var expr;
switch ((node.start._permute * steps | 0) % 3) {
case 0:
if (!(node.init instanceof U.AST_Definitions
&& node.init.definitions[0].name instanceof U.AST_Destructured)) {
expr = node.init;
}
break;
case 1:
expr = node.object;
break;
case 2:
if (!has_loopcontrol(node.body, node, parent)) expr = node.body;
break;
}
node.start._permute += step;
if (expr && (expr !== node.body || !has_loopcontrol(expr, node, parent))) {
if (expr) {
CHANGED = true;
return to_statement(expr);
}
@@ -389,6 +402,13 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
CHANGED = true;
return List.skip;
}
// skip element/property from (destructured) array/object
if (parent instanceof U.AST_Array || parent instanceof U.AST_Destructured || parent instanceof AST_Object) {
node.start._permute++;
CHANGED = true;
return List.skip;
}
}
// replace this node