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improve numeral compression (#3108)

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This commit is contained in:
Alex Lam S.L
2018-04-28 02:47:49 +08:00
committed by GitHub
parent 70d4477e05
commit 22cea023d1
2 changed files with 61 additions and 29 deletions
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30
lib/output.js
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@@ -1459,23 +1459,27 @@ function OutputStream(options) {
}
function make_num(num) {
var str = num.toString(10), a = [ str.replace(/^0\./, ".").replace('e+', 'e') ], m;
var str = num.toString(10).replace(/^0\./, ".").replace("e+", "e");
var candidates = [ str ];
if (Math.floor(num) === num) {
if (num >= 0) {
a.push("0x" + num.toString(16).toLowerCase(), // probably pointless
"0" + num.toString(8)); // same.
if (num < 0) {
candidates.push("-0x" + (-num).toString(16).toLowerCase());
} else {
a.push("-0x" + (-num).toString(16).toLowerCase(), // probably pointless
"-0" + (-num).toString(8)); // same.
candidates.push("0x" + num.toString(16).toLowerCase());
}
if ((m = /^(.*?)(0+)$/.exec(num))) {
a.push(m[1] + "e" + m[2].length);
}
} else if ((m = /^0?\.(0+)(.*)$/.exec(num))) {
a.push(m[2] + "e-" + (m[1].length + m[2].length),
str.substr(str.indexOf(".")));
}
return best_of(a);
var match, len, digits;
if (match = /^\.0+/.exec(str)) {
len = match[0].length;
digits = str.slice(len);
candidates.push(digits + "e-" + (digits.length + len - 1));
} else if (match = /0+$/.exec(str)) {
len = match[0].length;
candidates.push(str.slice(0, -len) + "e" + len);
} else if (match = /^(\d)\.(\d+)e(-?\d+)$/.exec(str)) {
candidates.push(match[1] + match[2] + "e" + (match[3] - match[2].length));
}
return best_of(candidates);
}
function make_block(stmt, output) {