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improve compression of undefined, NaN & Infinitiy (#1748)

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- migrate transformation logic from `OutputStream` to `Compressor`
- always turn `undefined` into `void 0` (unless `unsafe`)
- always keep `NaN` except when avoiding local variable redefinition
- introduce `keep_infinity` to suppress `1/0` transform, except when avoiding local variable redefinition

supersedes #1723
fixes #1730
This commit is contained in:
Alex Lam S.L
2017-04-01 03:02:14 +08:00
committed by GitHub
parent 1ddc05725d
commit 257ddc3bdb
9 changed files with 170 additions and 56 deletions
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68
test/compress/issue-1105.js
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@@ -193,6 +193,7 @@ assorted_Infinity_NaN_undefined_in_with_scope: {
cascade: true,
side_effects: true,
sequences: false,
keep_infinity: false,
}
input: {
var f = console.log;
@@ -224,10 +225,73 @@ assorted_Infinity_NaN_undefined_in_with_scope: {
};
if (o) {
f(void 0, void 0);
f(0/0, 0/0);
f(NaN, NaN);
f(1/0, 1/0);
f(-1/0, -1/0);
f(0/0, 0/0);
f(NaN, NaN);
}
with (o) {
f(undefined, void 0);
f(NaN, 0/0);
f(Infinity, 1/0);
f(-Infinity, -1/0);
f(9 + undefined, 9 + void 0);
}
}
expect_stdout: true
}
assorted_Infinity_NaN_undefined_in_with_scope_keep_infinity: {
options = {
unused: true,
evaluate: true,
dead_code: true,
conditionals: true,
comparisons: true,
booleans: true,
hoist_funs: true,
keep_fargs: true,
if_return: true,
join_vars: true,
cascade: true,
side_effects: true,
sequences: false,
keep_infinity: true,
}
input: {
var f = console.log;
var o = {
undefined : 3,
NaN : 4,
Infinity : 5,
};
if (o) {
f(undefined, void 0);
f(NaN, 0/0);
f(Infinity, 1/0);
f(-Infinity, -(1/0));
f(2 + 7 + undefined, 2 + 7 + void 0);
}
with (o) {
f(undefined, void 0);
f(NaN, 0/0);
f(Infinity, 1/0);
f(-Infinity, -(1/0));
f(2 + 7 + undefined, 2 + 7 + void 0);
}
}
expect: {
var f = console.log, o = {
undefined : 3,
NaN : 4,
Infinity : 5
};
if (o) {
f(void 0, void 0);
f(NaN, NaN);
f(Infinity, 1/0);
f(-Infinity, -1/0);
f(NaN, NaN);
}
with (o) {
f(undefined, void 0);