if ((self.left.is_string(compressor) && self.right.is_string(compressor)) ||
(self.left.is_number(compressor) && self.right.is_number(compressor)) ||
(self.left.is_boolean(compressor) && self.right.is_boolean(compressor)) ||
- self.left.equivalent_to(self.right)) {
+ can_self_compare(self.left) && self.left.equivalent_to(self.right)) {
self.operator = self.operator.slice(0, 2);
}
// XXX: intentionally falling down to the next case
}
return try_evaluate(compressor, self);
+ function can_self_compare(node) {
+ if (node instanceof AST_Dot) return can_self_compare(node.expression);
+ if (node instanceof AST_Sub) return can_self_compare(node.expression) && can_self_compare(node.property);
+ if (node instanceof AST_Symbol) return true;
+ return !node.has_side_effects(compressor);
+ }
+
function align(ref, op) {
switch (ref) {
case "-":
expect_stdout: "false true"
}
+self_comparison_3: {
+ options = {
+ comparisons: true,
+ }
+ input: {
+ var a;
+ function f() {
+ var b = a;
+ a = null;
+ return b;
+ }
+ for (var i = 0; i < 2; i++)
+ console.log(f() === f());
+ }
+ expect: {
+ var a;
+ function f() {
+ var b = a;
+ a = null;
+ return b;
+ }
+ for (var i = 0; i < 2; i++)
+ console.log(f() === f());
+ }
+ expect_stdout: [
+ "false",
+ "true",
+ ]
+}
+
issue_2857_1: {
options = {
comparisons: true,