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fix corner case in assignments (#3407)

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fixes #3406
This commit is contained in:
Alex Lam S.L
2019-05-12 03:52:46 +08:00
committed by GitHub
parent e88c439eac
commit 54cb678055
5 changed files with 77 additions and 55 deletions
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29
lib/compress.js
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@@ -5395,7 +5395,8 @@ merge(Compressor.prototype, {
OPT(AST_UnaryPrefix, function(self, compressor) {
var e = self.expression;
if (self.operator == "delete"
if (compressor.option("evaluate")
&& self.operator == "delete"
&& !(e instanceof AST_SymbolRef
|| e instanceof AST_PropAccess
|| is_identifier_atom(e))) {
@@ -6254,6 +6255,7 @@ merge(Compressor.prototype, {
if (compressor.option("dead_code")
&& self.left instanceof AST_SymbolRef
&& (def = self.left.definition()).scope === compressor.find_parent(AST_Lambda)) {
if (self.left.is_immutable()) return strip_assignment();
var level = 0, node, parent = self;
do {
node = parent;
@@ -6261,16 +6263,12 @@ merge(Compressor.prototype, {
if (parent instanceof AST_Exit) {
if (in_try(level, parent)) break;
if (is_reachable(def.scope, [ def ])) break;
if (self.operator == "=") return self.right.optimize(compressor);
def.fixed = false;
return make_node(AST_Binary, self, {
operator: self.operator.slice(0, -1),
left: self.left,
right: self.right
}).optimize(compressor);
return strip_assignment();
}
} while (parent instanceof AST_Binary && parent.right === node
|| parent instanceof AST_Sequence && parent.tail_node() === node);
|| parent instanceof AST_Sequence && parent.tail_node() === node
|| parent instanceof AST_UnaryPrefix);
}
self = self.lift_sequences(compressor);
if (!compressor.option("assignments")) return self;
@@ -6302,13 +6300,6 @@ merge(Compressor.prototype, {
expression: self.left
});
}
if (!compressor.option("ie8") && self.left instanceof AST_Symbol && self.left.is_immutable()) {
return (self.operator == "=" ? self.right : make_node(AST_Binary, self, {
operator: self.operator.slice(0, -1),
left: self.left,
right: self.right
})).optimize(compressor);
}
return self;
function in_try(level, node) {
@@ -6325,6 +6316,14 @@ merge(Compressor.prototype, {
}
}
}
function strip_assignment() {
return (self.operator != "=" ? make_node(AST_Binary, self, {
operator: self.operator.slice(0, -1),
left: self.left,
right: self.right
}) : maintain_this_binding(compressor, compressor.parent(), self, self.right)).optimize(compressor);
}
});
OPT(AST_Conditional, function(self, compressor) {