mirror of
https://github.com/swc-project/swc.git
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129 lines
3.6 KiB
TypeScript
129 lines
3.6 KiB
TypeScript
// Loaded from https://deno.land/x/oak@v6.3.1/negotiation/charset.ts
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/*!
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* Adapted directly from negotiator at https://github.com/jshttp/negotiator/
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* which is licensed as follows:
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*
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* (The MIT License)
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*
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* Copyright (c) 2012-2014 Federico Romero
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* Copyright (c) 2012-2014 Isaac Z. Schlueter
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* Copyright (c) 2014-2015 Douglas Christopher Wilson
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* 'Software'), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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import { compareSpecs, isQuality, Specificity } from "./common.ts";
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interface CharsetSpecificity extends Specificity {
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charset: string;
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}
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const SIMPLE_CHARSET_REGEXP = /^\s*([^\s;]+)\s*(?:;(.*))?$/;
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function parseCharset(str: string, i: number): CharsetSpecificity | undefined {
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const match = SIMPLE_CHARSET_REGEXP.exec(str);
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if (!match) {
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return;
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}
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const [, charset] = match;
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let q = 1;
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if (match[2]) {
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const params = match[2].split(";");
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for (const param of params) {
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const [key, value] = param.trim().split("=");
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if (key === "q") {
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q = parseFloat(value);
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break;
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}
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}
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}
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return { charset, q, i };
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}
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function parseAcceptCharset(accept: string): CharsetSpecificity[] {
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const accepts = accept.split(",");
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const result: CharsetSpecificity[] = [];
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for (let i = 0; i < accepts.length; i++) {
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const charset = parseCharset(accepts[i].trim(), i);
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if (charset) {
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result.push(charset);
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}
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}
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return result;
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}
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function specify(
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charset: string,
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spec: CharsetSpecificity,
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i: number,
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): Specificity | undefined {
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let s = 0;
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if (spec.charset.toLowerCase() === charset.toLocaleLowerCase()) {
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s |= 1;
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} else if (spec.charset !== "*") {
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return;
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}
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return { i, o: spec.i, q: spec.q, s };
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}
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function getCharsetPriority(
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charset: string,
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accepted: CharsetSpecificity[],
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index: number,
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): Specificity {
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let priority: Specificity = { i: -1, o: -1, q: 0, s: 0 };
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for (const accepts of accepted) {
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const spec = specify(charset, accepts, index);
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if (
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spec &&
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((priority.s ?? 0) - (spec.s ?? 0) || priority.q - spec.q ||
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(priority.o ?? 0) - (spec.o ?? 0)) < 0
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) {
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priority = spec;
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}
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}
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return priority;
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}
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export function preferredCharsets(accept = "*", provided?: string[]): string[] {
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const accepts = parseAcceptCharset(accept);
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if (!provided) {
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return accepts
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.filter(isQuality)
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.sort(compareSpecs)
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.map((spec) => spec.charset);
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}
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const priorities = provided
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.map((type, index) => getCharsetPriority(type, accepts, index));
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return priorities
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.filter(isQuality)
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.sort(compareSpecs)
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.map((priority) => provided[priorities.indexOf(priority)]);
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}
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