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optimize return undefined and return void 0

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This commit is contained in:
kzc
2015-10-28 13:25:27 -04:00
committed by Richard van Velzen
parent 335e349314
commit 7491d07666
2 changed files with 239 additions and 0 deletions
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10
lib/compress.js
View File

@@ -65,6 +65,7 @@ function Compressor(options, false_by_default) {
keep_fnames : false, keep_fnames : false,
hoist_vars : false, hoist_vars : false,
if_return : !false_by_default, if_return : !false_by_default,
return_void_0 : !false_by_default,
join_vars : !false_by_default, join_vars : !false_by_default,
cascade : !false_by_default, cascade : !false_by_default,
side_effects : !false_by_default, side_effects : !false_by_default,
@@ -2519,4 +2520,13 @@ merge(Compressor.prototype, {
OPT(AST_Object, literals_in_boolean_context); OPT(AST_Object, literals_in_boolean_context);
OPT(AST_RegExp, literals_in_boolean_context); OPT(AST_RegExp, literals_in_boolean_context);
OPT(AST_Return, function(self, compressor){
if (compressor.option("return_void_0")) {
if (self.value instanceof AST_Undefined) {
self.value = null;
}
}
return self;
});
})(); })();

229
test/compress/return_undefined.js Normal file
View File

@@ -0,0 +1,229 @@
return_void_0_true: {
options = {
return_void_0 : true,
sequences : false,
if_return : true,
evaluate : true,
dead_code : true,
conditionals : true,
comparisons : true,
booleans : true,
unused : true,
side_effects : true,
properties : true,
drop_debugger : true,
loops : true,
hoist_funs : true,
keep_fargs : true,
keep_fnames : false,
hoist_vars : true,
join_vars : true,
cascade : true,
negate_iife : true
};
input: {
function f0() {
}
function f1() {
return undefined;
}
function f2() {
return void 0;
}
function f3() {
return void 123;
}
function f4() {
return;
}
function f5(a, b) {
console.log(a, b);
baz(a);
return;
}
function f6(a, b) {
console.log(a, b);
if (a) {
foo(b);
baz(a);
return a + b;
}
return undefined;
}
function f7(a, b) {
console.log(a, b);
if (a) {
foo(b);
baz(a);
return void 0;
}
return a + b;
}
function f8(a, b) {
foo(a);
bar(b);
return void 0;
}
function f9(a, b) {
foo(a);
bar(b);
return undefined;
}
}
expect: {
function f0() {}
function f1() {}
function f2() {}
function f3() {}
function f4() {}
function f5(a, b) {
console.log(a, b);
baz(a);
}
function f6(a, b) {
console.log(a, b);
if (a) {
foo(b);
baz(a);
return a + b;
}
}
function f7(a, b) {
console.log(a, b);
if (!a)
return a + b;
foo(b);
baz(a);
}
function f8(a, b) {
foo(a);
bar(b);
}
function f9(a, b) {
foo(a);
bar(b);
}
}
}
return_void_0_false: {
options = {
return_void_0 : false,
sequences : false,
if_return : true,
evaluate : true,
dead_code : true,
conditionals : true,
comparisons : true,
booleans : true,
unused : true,
side_effects : true,
properties : true,
drop_debugger : true,
loops : true,
hoist_funs : true,
keep_fargs : true,
keep_fnames : false,
hoist_vars : true,
join_vars : true,
cascade : true,
negate_iife : true
};
input: {
function f0() {
}
function f1() {
return undefined;
}
function f2() {
return void 0;
}
function f3() {
return void 123;
}
function f4() {
return;
}
function f5(a, b) {
console.log(a, b);
baz(a);
return;
}
function f6(a, b) {
console.log(a, b);
if (a) {
foo(b);
baz(a);
return a + b;
}
return undefined;
}
function f7(a, b) {
console.log(a, b);
if (a) {
foo(b);
baz(a);
return void 0;
}
return a + b;
}
function f8(a, b) {
foo(a);
bar(b);
return void 0;
}
function f9(a, b) {
foo(a);
bar(b);
return undefined;
}
}
expect: {
function f0() {
}
function f1() {
return void 0;
}
function f2() {
return void 0;
}
function f3() {
return void 0;
}
function f4() {
}
function f5(a, b) {
console.log(a, b);
baz(a);
}
function f6(a, b) {
console.log(a, b);
if (a) {
foo(b);
baz(a);
return a + b;
}
return void 0;
}
function f7(a, b) {
console.log(a, b);
if (a) {
foo(b);
baz(a);
return void 0;
}
return a + b;
}
function f8(a, b) {
foo(a);
bar(b);
return void 0;
}
function f9(a, b) {
foo(a);
bar(b);
return void 0;
}
}
}