JoBoEVD/UglifyJS
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

populate may_eq_null()

Browse Source
This commit is contained in:
alexlamsl 2017-04-07 01:07:11 +08:00
parent 874beea90a
commit 218547048b
1 changed files with 25 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
lib/compress.js
View File

@ -1167,12 +1167,36 @@ merge(Compressor.prototype, {
}
(function(def) {
def(AST_Node, return_false);
def(AST_Node, return_true);
def(AST_Null, return_true);
def(AST_Undefined, return_true);
def(AST_Constant, return_false);
def(AST_Array, return_false);
def(AST_Object, return_false);
def(AST_Function, return_false);
def(AST_UnaryPostfix, return_false);
def(AST_UnaryPrefix, function() {
return this.operator == "void";
});
def(AST_Binary, function(compressor) {
switch (this.operator) {
case "&&":
return this.left.may_eq_null(compressor);
case "||":
return this.left.may_eq_null(compressor)
&& this.right.may_eq_null(compressor);
default:
return false;
}
})
def(AST_Assign, function(compressor) {
return this.operator == "="
&& this.right.may_eq_null(compressor);
})
def(AST_Conditional, function(compressor) {
return this.consequent.may_eq_null(compressor)
|| this.alternative.may_eq_null(compressor);
})
def(AST_Seq, function(compressor) {
return this.cdr.may_eq_null(compressor);
});