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enhance collapse_vars (#2788)

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This commit is contained in:
Alex Lam S.L
2018-01-15 18:47:23 +08:00
committed by GitHub
parent b483678ca7
commit 10f961c27b
2 changed files with 64 additions and 0 deletions
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14
lib/compress.js
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@@ -1181,14 +1181,26 @@ merge(Compressor.prototype, {
expr.definitions.forEach(extract_candidates);
} else if (expr instanceof AST_DWLoop) {
extract_candidates(expr.condition);
if (!(expr.body instanceof AST_Block)) {
extract_candidates(expr.body);
}
} else if (expr instanceof AST_Exit) {
if (expr.value) extract_candidates(expr.value);
} else if (expr instanceof AST_For) {
if (expr.init) extract_candidates(expr.init);
if (expr.condition) extract_candidates(expr.condition);
if (expr.step) extract_candidates(expr.step);
if (!(expr.body instanceof AST_Block)) {
extract_candidates(expr.body);
}
} else if (expr instanceof AST_If) {
extract_candidates(expr.condition);
if (!(expr.body instanceof AST_Block)) {
extract_candidates(expr.body);
}
if (expr.alternative && !(expr.alternative instanceof AST_Block)) {
extract_candidates(expr.alternative);
}
} else if (expr instanceof AST_Sequence) {
expr.expressions.forEach(extract_candidates);
} else if (expr instanceof AST_SimpleStatement) {
@@ -1215,10 +1227,12 @@ merge(Compressor.prototype, {
if (parent instanceof AST_Call) return node;
if (parent instanceof AST_Case) return node;
if (parent instanceof AST_Conditional) return node;
if (parent instanceof AST_Definitions) return find_stop(parent, level + 1);
if (parent instanceof AST_Exit) return node;
if (parent instanceof AST_If) return node;
if (parent instanceof AST_IterationStatement) return node;
if (parent instanceof AST_Sequence) return find_stop(parent, level + 1);
if (parent instanceof AST_SimpleStatement) return find_stop(parent, level + 1);
if (parent instanceof AST_Switch) return node;
if (parent instanceof AST_VarDef) return node;
return null;