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perform reduce_vars on safe literals (#2351)

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- constant expression
- single reference
- same scope
- not across loop body
This commit is contained in:
Alex Lam S.L
2017-10-09 12:25:06 +08:00
committed by GitHub
parent 1abe14296e
commit b810e2f8da
5 changed files with 286 additions and 36 deletions
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44
test/compress/collapse_vars.js
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@@ -1268,22 +1268,21 @@ collapse_vars_short_circuited_conditions: {
collapse_vars_regexp: {
options = {
collapse_vars: true,
loops: false,
sequences: true,
dead_code: true,
conditionals: true,
comparisons: true,
evaluate: true,
booleans: true,
unused: true,
hoist_funs: true,
keep_fargs: true,
cascade: true,
collapse_vars: true,
comparisons: true,
conditionals: true,
dead_code: true,
evaluate: true,
if_return: true,
join_vars: true,
cascade: true,
side_effects: true,
hoist_funs: true,
keep_fargs: true,
loops: false,
reduce_vars: true,
side_effects: true,
unused: true,
}
input: {
function f1() {
@@ -1292,12 +1291,12 @@ collapse_vars_regexp: {
return [rx, k];
}
function f2() {
var rx = /[abc123]+/;
var rx = /ab*/g;
return function(s) {
return rx.exec(s);
};
}
(function(){
(function() {
var result;
var s = 'acdabcdeabbb';
var rx = /ab*/g;
@@ -1305,22 +1304,35 @@ collapse_vars_regexp: {
console.log(result[0]);
}
})();
(function() {
var result;
var s = 'acdabcdeabbb';
var rx = f2();
while (result = rx(s)) {
console.log(result[0]);
}
})();
}
expect: {
function f1() {
return [/[A-Z]+/, 9];
}
function f2() {
var rx = /[abc123]+/;
var rx = /ab*/g;
return function(s) {
return rx.exec(s);
};
}
(function(){
(function() {
var result, rx = /ab*/g;
while (result = rx.exec("acdabcdeabbb"))
console.log(result[0]);
})();
(function() {
var result, rx = f2();
while (result = rx("acdabcdeabbb"))
console.log(result[0]);
})();
}
expect_stdout: true
}