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fix corner case in conditionals (#3577)

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fixes #3576
This commit is contained in:
Alex Lam S.L
2019-11-09 00:53:15 +08:00
committed by GitHub
parent 10648c9af6
commit 5045e140b1
2 changed files with 30 additions and 11 deletions
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15
lib/compress.js
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@@ -6673,7 +6673,7 @@ merge(Compressor.prototype, {
&& alt_tail instanceof AST_Assign
&& seq_tail.operator == alt_tail.operator
&& seq_tail.left.equivalent_to(alt_tail.left)
&& (is_eq && !seq_tail.left.has_side_effects(compressor)
&& (is_eq && seq_tail.left instanceof AST_SymbolRef
|| !condition.has_side_effects(compressor)
&& can_shift_lhs_of_tail(consequent)
&& can_shift_lhs_of_tail(alternative))) {
@@ -6842,16 +6842,9 @@ merge(Compressor.prototype, {
}
function can_shift_lhs_of_tail(node) {
if (node === node.tail_node()) return true;
var exprs = node.expressions;
for (var i = exprs.length - 1; --i >= 0;) {
var expr = exprs[i];
if (!(expr instanceof AST_Assign) && expr.has_side_effects(compressor)
|| expr.operator != "="
|| expr.left.has_side_effects(compressor)
|| expr.right.has_side_effects(compressor)) return false;
}
return true;
return node === node.tail_node() || all(node.expressions.slice(0, -1), function(expr) {
return !expr.has_side_effects(compressor);
});
}
function pop_lhs(node) {