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More information: https://www.jsdelivr.com/using-sri-with-dynamic-files\n */\n","/**\n * See \n * for more info on the algorithms.\n */\n\n/**\n * @typedef {string} Tag\n * BCP-47 tag.\n * @typedef {Array} Tags\n * List of BCP-47 tags.\n * @typedef {string} Range\n * RFC 4647 range.\n * @typedef {Array} Ranges\n * List of RFC 4647 range.\n *\n * @callback Check\n * An internal check.\n * @param {Tag} tag\n * BCP-47 tag.\n * @param {Range} range\n * RFC 4647 range.\n * @returns {boolean}\n * Whether the range matches the tag.\n *\n * @typedef {FilterOrLookup} Filter\n * Filter: yields all tags that match a range.\n * @typedef {FilterOrLookup} Lookup\n * Lookup: yields the best tag that matches a range.\n */\n\n/**\n * @template {boolean} IsFilter\n * Whether to filter or perform a lookup.\n * @callback FilterOrLookup\n * A check.\n * @param {Tag|Tags} tags\n * One or more BCP-47 tags.\n * @param {Range|Ranges|undefined} [ranges='*']\n * One or more RFC 4647 ranges.\n * @returns {IsFilter extends true ? Tags : Tag|undefined}\n * Result.\n */\n\n/**\n * Factory to perform a filter or a lookup.\n *\n * This factory creates a function that accepts a list of tags and a list of\n * ranges, and contains logic to exit early for lookups.\n * `check` just has to deal with one tag and one range.\n * This match function iterates over ranges, and for each range,\n * iterates over tags.\n * That way, earlier ranges matching any tag have precedence over later ranges.\n *\n * @template {boolean} IsFilter\n * @param {Check} check\n * A check.\n * @param {IsFilter} filter\n * Whether to filter or perform a lookup.\n * @returns {FilterOrLookup}\n * Filter or lookup.\n */\nfunction factory(check, filter) {\n /**\n * @param {Tag|Tags} tags\n * One or more BCP-47 tags.\n * @param {Range|Ranges|undefined} [ranges='*']\n * One or more RFC 4647 ranges.\n * @returns {IsFilter extends true ? Tags : Tag|undefined}\n * Result.\n */\n return function (tags, ranges) {\n let left = cast(tags, 'tag')\n const right = cast(\n ranges === null || ranges === undefined ? '*' : ranges,\n 'range'\n )\n /** @type {Tags} */\n const matches = []\n let rightIndex = -1\n\n while (++rightIndex < right.length) {\n const range = right[rightIndex].toLowerCase()\n\n // Ignore wildcards in lookup mode.\n if (!filter && range === '*') continue\n\n let leftIndex = -1\n /** @type {Tags} */\n const next = []\n\n while (++leftIndex < left.length) {\n if (check(left[leftIndex].toLowerCase(), range)) {\n // Exit if this is a lookup and we have a match.\n if (!filter) {\n return /** @type {IsFilter extends true ? Tags : Tag|undefined} */ (\n left[leftIndex]\n )\n }\n\n matches.push(left[leftIndex])\n } else {\n next.push(left[leftIndex])\n }\n }\n\n left = next\n }\n\n // If this is a filter, return the list. If it’s a lookup, we didn’t find\n // a match, so return `undefined`.\n return /** @type {IsFilter extends true ? Tags : Tag|undefined} */ (\n filter ? matches : undefined\n )\n }\n}\n\n/**\n * Basic Filtering (Section 3.3.1) matches a language priority list consisting\n * of basic language ranges (Section 2.1) to sets of language tags.\n *\n * @param {Tag|Tags} tags\n * One or more BCP-47 tags.\n * @param {Range|Ranges|undefined} [ranges='*']\n * One or more RFC 4647 ranges.\n * @returns {Tags}\n * List of BCP-47 tags.\n */\nexport const basicFilter = factory(function (tag, range) {\n return range === '*' || tag === range || tag.includes(range + '-')\n}, true)\n\n/**\n * Extended Filtering (Section 3.3.2) matches a language priority list\n * consisting of extended language ranges (Section 2.2) to sets of language\n * tags.\n *\n * @param {Tag|Tags} tags\n * One or more BCP-47 tags.\n * @param {Range|Ranges|undefined} [ranges='*']\n * One or more RFC 4647 ranges.\n * @returns {Tags}\n * List of BCP-47 tags.\n */\nexport const extendedFilter = factory(function (tag, range) {\n // 3.3.2.1\n const left = tag.split('-')\n const right = range.split('-')\n let leftIndex = 0\n let rightIndex = 0\n\n // 3.3.2.2\n if (right[rightIndex] !== '*' && left[leftIndex] !== right[rightIndex]) {\n return false\n }\n\n leftIndex++\n rightIndex++\n\n // 3.3.2.3\n while (rightIndex < right.length) {\n // 3.3.2.3.A\n if (right[rightIndex] === '*') {\n rightIndex++\n continue\n }\n\n // 3.3.2.3.B\n if (!left[leftIndex]) return false\n\n // 3.3.2.3.C\n if (left[leftIndex] === right[rightIndex]) {\n leftIndex++\n rightIndex++\n continue\n }\n\n // 3.3.2.3.D\n if (left[leftIndex].length === 1) return false\n\n // 3.3.2.3.E\n leftIndex++\n }\n\n // 3.3.2.4\n return true\n}, true)\n\n/**\n * Lookup (Section 3.4) matches a language priority list consisting of basic\n * language ranges to sets of language tags to find the one exact language tag\n * that best matches the range.\n *\n * @param {Tag|Tags} tags\n * One or more BCP-47 tags.\n * @param {Range|Ranges|undefined} [ranges='*']\n * One or more RFC 4647 ranges.\n * @returns {Tag|undefined}\n * BCP-47 tag.\n */\nexport const lookup = factory(function (tag, range) {\n let right = range\n\n /* eslint-disable-next-line no-constant-condition */\n while (true) {\n if (right === '*' || tag === right) return true\n\n let index = right.lastIndexOf('-')\n\n if (index < 0) return false\n\n if (right.charAt(index - 2) === '-') index -= 2\n\n right = right.slice(0, index)\n }\n}, false)\n\n/**\n * Validate tags or ranges, and cast them to arrays.\n *\n * @param {string|Array} values\n * @param {string} name\n * @returns {Array}\n */\nfunction cast(values, name) {\n const value = values && typeof values === 'string' ? [values] : values\n\n if (!value || typeof value !== 'object' || !('length' in value)) {\n throw new Error(\n 'Invalid ' + name + ' `' + value + '`, expected non-empty string'\n )\n }\n\n return value\n}\n"]}