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enhance collapse_vars (#2704)

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This commit is contained in:
Alex Lam S.L
2018-01-02 18:42:15 +08:00
committed by GitHub
parent cc931b3ad8
commit 6dead95eb3
2 changed files with 16 additions and 7 deletions
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19
lib/compress.js
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@@ -1159,10 +1159,10 @@ merge(Compressor.prototype, {
if (!expr.left.has_side_effects(compressor)) {
candidates.push(hit_stack.slice());
}
} else if (expr instanceof AST_Unary) {
if (expr.operator == "++" || expr.operator == "--") {
candidates.push(hit_stack.slice());
}
extract_candidates(expr.right);
} else if (expr instanceof AST_Binary) {
extract_candidates(expr.left);
extract_candidates(expr.right);
} else if (expr instanceof AST_Call) {
extract_candidates(expr.expression);
expr.args.forEach(extract_candidates);
@@ -1187,14 +1187,22 @@ merge(Compressor.prototype, {
} else if (expr instanceof AST_Switch) {
extract_candidates(expr.expression);
expr.body.forEach(extract_candidates);
} else if (expr instanceof AST_Unary) {
if (expr.operator == "++" || expr.operator == "--") {
candidates.push(hit_stack.slice());
}
} else if (expr instanceof AST_VarDef) {
if (expr.value) candidates.push(hit_stack.slice());
if (expr.value) {
candidates.push(hit_stack.slice());
extract_candidates(expr.value);
}
}
hit_stack.pop();
}
function find_stop(node, level) {
var parent = scanner.parent(level);
if (parent instanceof AST_Binary) return node;
if (parent instanceof AST_Call) return node;
if (parent instanceof AST_Case) return node;
if (parent instanceof AST_Conditional) return node;
@@ -1202,6 +1210,7 @@ merge(Compressor.prototype, {
if (parent instanceof AST_If) return node;
if (parent instanceof AST_Sequence) return find_stop(parent, level + 1);
if (parent instanceof AST_Switch) return node;
if (parent instanceof AST_VarDef) return node;
return null;
}

4
test/compress/functions.js
View File

@@ -1285,7 +1285,7 @@ issue_2630_1: {
expect: {
var c = 0;
(function() {
while (c++, void (c = 1 + c));
while (void (c = 1 + ++c));
})(),
console.log(c);
}
@@ -1316,7 +1316,7 @@ issue_2630_2: {
expect: {
var c = 0;
!function() {
while (c += 1, void (c = 1 + c));
while (void (c = 1 + (c += 1)));
}(), console.log(c);
}
expect_stdout: "2"