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fix corner case in unsafe_math (#3594)

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fixes #3593
This commit is contained in:
Alex Lam S.L
2019-11-18 13:44:13 +08:00
committed by GitHub
parent 8504a4ea0e
commit 644f65feca
2 changed files with 45 additions and 33 deletions
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60
lib/compress.js
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@@ -6191,38 +6191,12 @@ merge(Compressor.prototype, {
&& self.left.operator != "%"
&& PRECEDENCE[self.left.operator] == PRECEDENCE[self.operator]
&& self.left.is_number(compressor)) {
if (self.left.left instanceof AST_Constant
&& (self.operator != "+"
|| self.left.left.is_boolean(compressor)
|| self.left.left.is_number(compressor))) {
self = make_node(AST_Binary, self, {
operator: self.left.operator,
left: make_node(AST_Binary, self.left, {
operator: self.operator,
left: self.left.left,
right: self.right,
start: self.left.left.start,
end: self.right.end
}),
right: self.left.right
});
if (self.left.left instanceof AST_Constant) {
var lhs = make_binary(self.left, self.operator, self.left.left, self.right, self.left.left.start, self.right.end);
self = make_binary(self, self.left.operator, lhs, self.left.right);
} else if (self.left.right instanceof AST_Constant) {
var op = align(self.left.operator, self.operator);
if (op != "+"
|| self.left.right.is_boolean(compressor)
|| self.left.right.is_number(compressor)) {
self = make_node(AST_Binary, self, {
operator: self.left.operator,
left: self.left.left,
right: make_node(AST_Binary, self.left, {
operator: op,
left: self.left.right,
right: self.right,
start: self.left.right.start,
end: self.right.end
})
});
}
var rhs = make_binary(self.left, align(self.left.operator, self.operator), self.left.right, self.right, self.left.right.start, self.right.end);
self = make_binary(self, self.left.operator, self.left.left, rhs);
}
}
break;
@@ -6304,6 +6278,30 @@ merge(Compressor.prototype, {
}
}
function make_binary(orig, op, left, right, start, end) {
if (op == "+") {
if (!left.is_boolean(compressor) && !left.is_number(compressor)) {
left = make_node(AST_UnaryPrefix, left, {
operator: "+",
expression: left
});
}
if (!right.is_boolean(compressor) && !right.is_number(compressor)) {
right = make_node(AST_UnaryPrefix, right, {
operator: "+",
expression: right
});
}
}
return make_node(AST_Binary, orig, {
operator: op,
left: left,
right: right,
start: start,
end: end
});
}
function fuzzy_eval(node) {
if (node.truthy) return true;
if (node.falsy) return false;