51 lines
1.4 KiB
Plaintext
Executable File
51 lines
1.4 KiB
Plaintext
Executable File
"use strict";
|
|
Object.defineProperty(exports, "__esModule", { value: true });
|
|
exports.UnicodeExtensionValue = void 0;
|
|
var utils_1 = require("./utils");
|
|
/**
|
|
* https://tc39.es/ecma402/#sec-unicodeextensionvalue
|
|
* @param extension
|
|
* @param key
|
|
*/
|
|
function UnicodeExtensionValue(extension, key) {
|
|
(0, utils_1.invariant)(key.length === 2, 'key must have 2 elements');
|
|
var size = extension.length;
|
|
var searchValue = "-".concat(key, "-");
|
|
var pos = extension.indexOf(searchValue);
|
|
if (pos !== -1) {
|
|
var start = pos + 4;
|
|
var end = start;
|
|
var k = start;
|
|
var done = false;
|
|
while (!done) {
|
|
var e = extension.indexOf('-', k);
|
|
var len = void 0;
|
|
if (e === -1) {
|
|
len = size - k;
|
|
}
|
|
else {
|
|
len = e - k;
|
|
}
|
|
if (len === 2) {
|
|
done = true;
|
|
}
|
|
else if (e === -1) {
|
|
end = size;
|
|
done = true;
|
|
}
|
|
else {
|
|
end = e;
|
|
k = e + 1;
|
|
}
|
|
}
|
|
return extension.slice(start, end);
|
|
}
|
|
searchValue = "-".concat(key);
|
|
pos = extension.indexOf(searchValue);
|
|
if (pos !== -1 && pos + 3 === size) {
|
|
return '';
|
|
}
|
|
return undefined;
|
|
}
|
|
exports.UnicodeExtensionValue = UnicodeExtensionValue;
|