46 lines
1.7 KiB
JavaScript
46 lines
1.7 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.UnicodeExtensionComponents = UnicodeExtensionComponents;
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var utils_1 = require("./utils");
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function UnicodeExtensionComponents(extension) {
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(0, utils_1.invariant)(extension === extension.toLowerCase(), 'Expected extension to be lowercase');
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(0, utils_1.invariant)(extension.slice(0, 3) === '-u-', 'Expected extension to be a Unicode locale extension');
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var attributes = [];
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var keywords = [];
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var keyword;
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var size = extension.length;
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var k = 3;
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while (k < size) {
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var e = extension.indexOf('-', k);
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var len = void 0;
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if (e === -1) {
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len = size - k;
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}
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else {
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len = e - k;
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}
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var subtag = extension.slice(k, k + len);
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(0, utils_1.invariant)(len >= 2, 'Expected a subtag to have at least 2 characters');
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if (keyword === undefined && len != 2) {
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if (attributes.indexOf(subtag) === -1) {
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attributes.push(subtag);
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}
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}
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else if (len === 2) {
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keyword = { key: subtag, value: '' };
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if (keywords.find(function (k) { return k.key === (keyword === null || keyword === void 0 ? void 0 : keyword.key); }) === undefined) {
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keywords.push(keyword);
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}
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}
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else if ((keyword === null || keyword === void 0 ? void 0 : keyword.value) === '') {
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keyword.value = subtag;
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}
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else {
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(0, utils_1.invariant)(keyword !== undefined, 'Expected keyword to be defined');
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keyword.value += '-' + subtag;
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}
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k += len + 1;
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}
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return { attributes: attributes, keywords: keywords };
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}
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