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improve reduction of AST_BlockStatement (#3708)

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This commit is contained in:
Alex Lam S.L
2020-02-06 21:20:05 +00:00
committed by GitHub
parent 551420132c
commit 470a7d4df1
1 changed files with 8 additions and 15 deletions
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15
test/reduce.js
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@@ -116,10 +116,10 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
][ ((node.start._permute += step) * steps | 0) % 3 ]; ][ ((node.start._permute += step) * steps | 0) % 3 ];
} }
else if (node instanceof U.AST_BlockStatement) { else if (node instanceof U.AST_BlockStatement) {
if (node.body.length === 1) { if (in_list) {
node.start._permute++; node.start._permute++;
CHANGED = true; CHANGED = true;
return node.body[0]; // each child is an AST_Statement return List.splice(node.body);
} }
} }
else if (node instanceof U.AST_Call) { else if (node instanceof U.AST_Call) {
@@ -274,20 +274,13 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
// replace or skip statement // replace or skip statement
if (node instanceof U.AST_Statement) { if (node instanceof U.AST_Statement) {
if (node instanceof U.AST_BlockStatement if (node instanceof U.AST_LabeledStatement
&& ( parent instanceof U.AST_IterationStatement && node.body instanceof U.AST_Statement) {
|| parent instanceof U.AST_Switch)) {
// don't drop the block of a switch or loop
return;
}
if (node instanceof U.AST_LabeledStatement) {
if (node.body instanceof U.AST_Statement) {
// replace labelled statement with its non-labelled body // replace labelled statement with its non-labelled body
node.start._permute = REPLACEMENTS.length; node.start._permute = REPLACEMENTS.length;
CHANGED = true; CHANGED = true;
return node.body; return node.body;
} }
}
node.start._permute++; node.start._permute++;
CHANGED = true; CHANGED = true;
return List.skip; return List.skip;