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fix corner case in evaluate & unsafe (#5355)

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fixes #5354
This commit is contained in:
Alex Lam S.L
2022-02-15 14:47:22 +08:00
committed by GitHub
parent 316245ee12
commit 0b50880b4f
3 changed files with 58 additions and 29 deletions
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43
lib/compress.js
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@@ -4389,9 +4389,6 @@ Compressor.prototype.compress = function(node) {
"setUTCMonth",
"setUTCSeconds",
"setYear",
"toExponential",
"toFixed",
"toPrecision",
]);
def(AST_Call, function(compressor) {
if (!compressor.option("unsafe")) return false;
@@ -4442,7 +4439,10 @@ Compressor.prototype.compress = function(node) {
"charAt",
"substr",
"substring",
"toExponential",
"toFixed",
"toLowerCase",
"toPrecision",
"toString",
"toUpperCase",
"trim",
@@ -10771,6 +10771,9 @@ Compressor.prototype.compress = function(node) {
if (seq !== self) return seq.optimize(compressor);
}
switch (op) {
case "+":
if (compressor.option("evaluate") && exp.is_number(compressor)) return exp;
break;
case "-":
if (exp instanceof AST_Infinity) exp = exp.transform(compressor);
// avoids infinite recursion of numerals
@@ -11477,19 +11480,17 @@ Compressor.prototype.compress = function(node) {
if (self.left.value == 0) {
if (self.right.is_boolean(compressor)) return make_node(AST_UnaryPrefix, self, {
operator: "+",
expression: self.right
expression: self.right,
}).optimize(compressor);
if (self.right.is_number(compressor) && !self.right.is_negative_zero()) return self.right;
}
break;
// 1 * n ---> n
case "*":
if (self.left.value == 1) {
return self.right.is_number(compressor) ? self.right : make_node(AST_UnaryPrefix, self, {
operator: "+",
expression: self.right
}).optimize(compressor);
}
if (self.left.value == 1) return make_node(AST_UnaryPrefix, self, {
operator: "+",
expression: self.right,
}).optimize(compressor);
break;
}
if (self.right instanceof AST_Number && !self.left.is_constant()) switch (self.operator) {
@@ -11498,28 +11499,24 @@ Compressor.prototype.compress = function(node) {
if (self.right.value == 0) {
if (self.left.is_boolean(compressor)) return make_node(AST_UnaryPrefix, self, {
operator: "+",
expression: self.left
expression: self.left,
}).optimize(compressor);
if (self.left.is_number(compressor) && !self.left.is_negative_zero()) return self.left;
}
break;
// n - 0 ---> n
case "-":
if (self.right.value == 0) {
return self.left.is_number(compressor) ? self.left : make_node(AST_UnaryPrefix, self, {
operator: "+",
expression: self.left
}).optimize(compressor);
}
if (self.right.value == 0) return make_node(AST_UnaryPrefix, self, {
operator: "+",
expression: self.left,
}).optimize(compressor);
break;
// n / 1 ---> n
case "/":
if (self.right.value == 1) {
return self.left.is_number(compressor) ? self.left : make_node(AST_UnaryPrefix, self, {
operator: "+",
expression: self.left
}).optimize(compressor);
}
if (self.right.value == 1) return make_node(AST_UnaryPrefix, self, {
operator: "+",
expression: self.left,
}).optimize(compressor);
break;
}
}