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enhance collapse_vars (#2952)

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- `a = b, b` => `a = b`
- `a.b = c, c()` => `(a.b = c)()`
This commit is contained in:
Alex Lam S.L
2018-02-28 15:19:32 +08:00
committed by GitHub
parent ace5811691
commit 36bca6934d
4 changed files with 782 additions and 25 deletions
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331
test/compress/pure_getters.js
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@@ -830,3 +830,334 @@ issue_2938_4: {
}
expect_stdout: "PASS"
}
collapse_vars_1_true: {
options = {
collapse_vars: true,
pure_getters: true,
unused: true,
}
input: {
function f(a, b) {
for (;;) {
var c = a.g();
var d = b.p;
if (c || d) break;
}
}
}
expect: {
function f(a, b) {
for (;;) {
if (a.g() || b.p) break;
}
}
}
}
collapse_vars_1_false: {
options = {
collapse_vars: true,
pure_getters: false,
unused: true,
}
input: {
function f(a, b) {
for (;;) {
var c = a.g();
var d = b.p;
if (c || d) break;
}
}
}
expect: {
function f(a, b) {
for (;;) {
var c = a.g();
var d = b.p;
if (c || d) break;
}
}
}
}
collapse_vars_1_strict: {
options = {
collapse_vars: true,
pure_getters: "strict",
unused: true,
}
input: {
function f(a, b) {
for (;;) {
var c = a.g();
var d = b.p;
if (c || d) break;
}
}
}
expect: {
function f(a, b) {
for (;;) {
var c = a.g();
var d = b.p;
if (c || d) break;
}
}
}
}
collapse_vars_2_true: {
options = {
collapse_vars: true,
pure_getters: true,
reduce_vars: true,
}
input: {
function f() {
function g() {}
g.a = function() {};
g.b = g.a;
return g;
}
}
expect: {
function f() {
function g() {}
g.b = g.a = function() {};
return g;
}
}
}
collapse_vars_2_false: {
options = {
collapse_vars: true,
pure_getters: false,
reduce_vars: true,
}
input: {
function f() {
function g() {}
g.a = function() {};
g.b = g.a;
return g;
}
}
expect: {
function f() {
function g() {}
g.a = function() {};
g.b = g.a;
return g;
}
}
}
collapse_vars_2_strict: {
options = {
collapse_vars: true,
pure_getters: "strict",
reduce_vars: true,
}
input: {
function f() {
function g() {}
g.a = function() {};
g.b = g.a;
return g;
}
}
expect: {
function f() {
function g() {}
g.b = g.a = function() {};
return g;
}
}
}
collapse_rhs_true: {
options = {
collapse_vars: true,
pure_getters: true,
}
input: {
console.log((42..length = "PASS", "PASS"));
console.log(("foo".length = "PASS", "PASS"));
console.log((false.length = "PASS", "PASS"));
console.log((function() {}.length = "PASS", "PASS"));
console.log(({
get length() {
return "FAIL";
}
}.length = "PASS", "PASS"));
}
expect: {
console.log(42..length = "PASS");
console.log("foo".length = "PASS");
console.log(false.length = "PASS");
console.log(function() {}.length = "PASS");
console.log({
get length() {
return "FAIL";
}
}.length = "PASS");
}
expect_stdout: [
"PASS",
"PASS",
"PASS",
"PASS",
"PASS",
]
}
collapse_rhs_false: {
options = {
collapse_vars: true,
pure_getters: false,
}
input: {
console.log((42..length = "PASS", "PASS"));
console.log(("foo".length = "PASS", "PASS"));
console.log((false.length = "PASS", "PASS"));
console.log((function() {}.length = "PASS", "PASS"));
console.log(({
get length() {
return "FAIL";
}
}.length = "PASS", "PASS"));
}
expect: {
console.log(42..length = "PASS");
console.log("foo".length = "PASS");
console.log(false.length = "PASS");
console.log(function() {}.length = "PASS");
console.log({
get length() {
return "FAIL";
}
}.length = "PASS");
}
expect_stdout: [
"PASS",
"PASS",
"PASS",
"PASS",
"PASS",
]
}
collapse_rhs_strict: {
options = {
collapse_vars: true,
pure_getters: "strict",
}
input: {
console.log((42..length = "PASS", "PASS"));
console.log(("foo".length = "PASS", "PASS"));
console.log((false.length = "PASS", "PASS"));
console.log((function() {}.length = "PASS", "PASS"));
console.log(({
get length() {
return "FAIL";
}
}.length = "PASS", "PASS"));
}
expect: {
console.log(42..length = "PASS");
console.log("foo".length = "PASS");
console.log(false.length = "PASS");
console.log(function() {}.length = "PASS");
console.log({
get length() {
return "FAIL";
}
}.length = "PASS");
}
expect_stdout: [
"PASS",
"PASS",
"PASS",
"PASS",
"PASS",
]
}
collapse_rhs_setter: {
options = {
collapse_vars: true,
pure_getters: "strict",
}
input: {
try {
console.log(({
set length(v) {
throw "PASS";
}
}.length = "FAIL", "FAIL"));
} catch (e) {
console.log(e);
}
}
expect: {
try {
console.log({
set length(v) {
throw "PASS";
}
}.length = "FAIL");
} catch (e) {
console.log(e);
}
}
expect_stdout: "PASS"
}
collapse_rhs_call: {
options = {
collapse_vars: true,
passes: 2,
pure_getters: "strict",
reduce_vars: true,
toplevel: true,
unused: true,
}
input: {
var o = {};
function f() {
console.log("PASS");
}
o.f = f;
f();
}
expect: {
({}.f = function() {
console.log("PASS");
})();
}
expect_stdout: "PASS"
}
collapse_rhs_lhs: {
options = {
collapse_vars: true,
pure_getters: true,
}
input: {
function f(a, b) {
a.b = b, b += 2;
console.log(a.b, b);
}
f({}, 1);
}
expect: {
function f(a, b) {
a.b = b, b += 2;
console.log(a.b, b);
}
f({}, 1);
}
expect_stdout: "1 3"
}