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improve string concatenation

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shuffle associative operations to minimise parentheses and aid other uglification efforts

closes #1454
This commit is contained in:
alexlamsl
2017-02-18 19:07:52 +08:00
parent f584ca8d07
commit 6b3c49e458
3 changed files with 152 additions and 5 deletions
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140
test/compress/concat-strings.js
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@@ -24,3 +24,143 @@ concat_1: {
var f = "\x00360\08\0";
}
}
concat_2: {
options = {};
input: {
console.log(
1 + (2 + 3),
1 + (2 + "3"),
1 + ("2" + 3),
1 + ("2" + "3"),
"1" + (2 + 3),
"1" + (2 + "3"),
"1" + ("2" + 3),
"1" + ("2" + "3")
);
}
expect: {
console.log(
1 + (2 + 3),
1 + (2 + "3"),
1 + "2" + 3,
1 + "2" + "3",
"1" + (2 + 3),
"1" + 2 + "3",
"1" + "2" + 3,
"1" + "2" + "3"
);
}
}
concat_3: {
options = {};
input: {
console.log(
1 + 2 + (3 + 4 + 5),
1 + 2 + (3 + 4 + "5"),
1 + 2 + (3 + "4" + 5),
1 + 2 + (3 + "4" + "5"),
1 + 2 + ("3" + 4 + 5),
1 + 2 + ("3" + 4 + "5"),
1 + 2 + ("3" + "4" + 5),
1 + 2 + ("3" + "4" + "5")
);
}
expect: {
console.log(
1 + 2 + (3 + 4 + 5),
1 + 2 + (3 + 4 + "5"),
1 + 2 + (3 + "4") + 5,
1 + 2 + (3 + "4") + "5",
1 + 2 + "3" + 4 + 5,
1 + 2 + "3" + 4 + "5",
1 + 2 + "3" + "4" + 5,
1 + 2 + "3" + "4" + "5"
);
}
}
concat_4: {
options = {};
input: {
console.log(
1 + "2" + (3 + 4 + 5),
1 + "2" + (3 + 4 + "5"),
1 + "2" + (3 + "4" + 5),
1 + "2" + (3 + "4" + "5"),
1 + "2" + ("3" + 4 + 5),
1 + "2" + ("3" + 4 + "5"),
1 + "2" + ("3" + "4" + 5),
1 + "2" + ("3" + "4" + "5")
);
}
expect: {
console.log(
1 + "2" + (3 + 4 + 5),
1 + "2" + (3 + 4) + "5",
1 + "2" + 3 + "4" + 5,
1 + "2" + 3 + "4" + "5",
1 + "2" + "3" + 4 + 5,
1 + "2" + "3" + 4 + "5",
1 + "2" + "3" + "4" + 5,
1 + "2" + "3" + "4" + "5"
);
}
}
concat_5: {
options = {};
input: {
console.log(
"1" + 2 + (3 + 4 + 5),
"1" + 2 + (3 + 4 + "5"),
"1" + 2 + (3 + "4" + 5),
"1" + 2 + (3 + "4" + "5"),
"1" + 2 + ("3" + 4 + 5),
"1" + 2 + ("3" + 4 + "5"),
"1" + 2 + ("3" + "4" + 5),
"1" + 2 + ("3" + "4" + "5")
);
}
expect: {
console.log(
"1" + 2 + (3 + 4 + 5),
"1" + 2 + (3 + 4) + "5",
"1" + 2 + 3 + "4" + 5,
"1" + 2 + 3 + "4" + "5",
"1" + 2 + "3" + 4 + 5,
"1" + 2 + "3" + 4 + "5",
"1" + 2 + "3" + "4" + 5,
"1" + 2 + "3" + "4" + "5"
);
}
}
concat_6: {
options = {};
input: {
console.log(
"1" + "2" + (3 + 4 + 5),
"1" + "2" + (3 + 4 + "5"),
"1" + "2" + (3 + "4" + 5),
"1" + "2" + (3 + "4" + "5"),
"1" + "2" + ("3" + 4 + 5),
"1" + "2" + ("3" + 4 + "5"),
"1" + "2" + ("3" + "4" + 5),
"1" + "2" + ("3" + "4" + "5")
);
}
expect: {
console.log(
"1" + "2" + (3 + 4 + 5),
"1" + "2" + (3 + 4) + "5",
"1" + "2" + 3 + "4" + 5,
"1" + "2" + 3 + "4" + "5",
"1" + "2" + "3" + 4 + 5,
"1" + "2" + "3" + 4 + "5",
"1" + "2" + "3" + "4" + 5,
"1" + "2" + "3" + "4" + "5"
);
}
}