node.DEFMETHOD("has_side_effects", func);
});
+ // determine if expression is constant
+ (function(def){
+ function all(list) {
+ for (var i = list.length; --i >= 0;)
+ if (!list[i].is_constant_expression())
+ return false;
+ return true;
+ }
+ def(AST_Node, return_false);
+ def(AST_Constant, return_true);
+ def(AST_Unary, function(){
+ return this.expression.is_constant_expression();
+ });
+ def(AST_Binary, function(){
+ return this.left.is_constant_expression() && this.right.is_constant_expression();
+ });
+ def(AST_Array, function(){
+ return all(this.elements);
+ });
+ def(AST_Object, function(){
+ return all(this.properties);
+ });
+ def(AST_ObjectProperty, function(){
+ return this.value.is_constant_expression();
+ });
+ })(function(node, func){
+ node.DEFMETHOD("is_constant_expression", func);
+ });
+
// tell me if a statement aborts
function aborts(thing) {
return thing && thing.aborts();
if (exp instanceof AST_Function) {
if (exp.body[0] instanceof AST_Return) {
var value = exp.body[0].value;
- if (!value || value.is_constant()) {
+ if (!value || value.is_constant_expression()) {
var args = self.args.concat(value || make_node(AST_Undefined, self));
return make_sequence(self, args).transform(compressor);
}
}
expect_exact: "42"
}
+
+function_returning_constant_literal: {
+ options = {
+ reduce_vars: true,
+ unsafe: true,
+ toplevel: true,
+ evaluate: true,
+ cascade: true,
+ unused: true,
+ }
+ input: {
+ function greeter() {
+ return { message: 'Hello there' };
+ }
+ var greeting = greeter();
+ console.log(greeting.message);
+ }
+ expect: {
+ console.log("Hello there");
+ }
+ expect_stdout: "Hello there"
+}
negate_iife: true
};
input: {
- (function(){ return {} })().x = 10; // should not transform this one
- }
- expect: {
(function(){ return {} })().x = 10;
}
+ expect_exact: "({}).x=10;"
}
negate_iife_2_side_effects: {
side_effects: true,
}
input: {
- (function(){ return {} })().x = 10; // should not transform this one
- }
- expect: {
(function(){ return {} })().x = 10;
}
+ expect_exact: "({}).x=10;"
}
negate_iife_3: {