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enhance unsafe for Array (#3349)

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This commit is contained in:
Alex Lam S.L
2019-03-20 06:37:51 +08:00
committed by GitHub
parent b9615f7a62
commit f2286c33f1
3 changed files with 158 additions and 9 deletions
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36
lib/compress.js
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@@ -4003,17 +4003,17 @@ merge(Compressor.prototype, {
return this;
});
def(AST_Binary, function(compressor, first_in_statement) {
var right = this.right.drop_side_effect_free(compressor);
var right = this.right.drop_side_effect_free(compressor, first_in_statement);
if (!right) return this.left.drop_side_effect_free(compressor, first_in_statement);
if (lazy_op[this.operator]) {
if (right === this.right) return this;
var node = this.clone();
node.right = right;
node.right = right.drop_side_effect_free(compressor);
return node;
} else {
var left = this.left.drop_side_effect_free(compressor, first_in_statement);
if (!left) return this.right.drop_side_effect_free(compressor, first_in_statement);
return make_sequence(this, [ left, right ]);
if (!left) return right;
return make_sequence(this, [ left, right.drop_side_effect_free(compressor) ]);
}
});
def(AST_Call, function(compressor, first_in_statement) {
@@ -4666,12 +4666,30 @@ merge(Compressor.prototype, {
if (compressor.option("unsafe")) {
if (is_undeclared_ref(exp)) switch (exp.name) {
case "Array":
if (self.args.length != 1) {
return make_node(AST_Array, self, {
elements: self.args
}).optimize(compressor);
if (self.args.length == 1) {
var first = self.args[0];
if (first instanceof AST_Number) try {
var length = first.getValue();
if (length > 6) break;
var elements = Array(length);
for (var i = 0; i < length; i++) elements[i] = make_node(AST_Hole, self);
return make_node(AST_Array, self, {
elements: elements
});
} catch (ex) {
compressor.warn("Invalid array length: {length} [{file}:{line},{col}]", {
length: length,
file: self.start.file,
line: self.start.line,
col: self.start.col
});
break;
}
if (!first.is_boolean(compressor) && !first.is_string(compressor)) break;
}
break;
return make_node(AST_Array, self, {
elements: self.args
});
case "Object":
if (self.args.length == 0) {
return make_node(AST_Object, self, {