mirror of
https://github.com/swc-project/swc.git
synced 2024-12-29 16:42:28 +03:00
129 lines
3.6 KiB
TypeScript
129 lines
3.6 KiB
TypeScript
// Loaded from https://deno.land/x/oak/negotiation/charset.ts
|
|
|
|
|
|
/*!
|
|
* Adapted directly from negotiator at https://github.com/jshttp/negotiator/
|
|
* which is licensed as follows:
|
|
*
|
|
* (The MIT License)
|
|
*
|
|
* Copyright (c) 2012-2014 Federico Romero
|
|
* Copyright (c) 2012-2014 Isaac Z. Schlueter
|
|
* Copyright (c) 2014-2015 Douglas Christopher Wilson
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files (the
|
|
* 'Software'), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
|
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
|
|
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
|
|
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
|
|
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
import { compareSpecs, isQuality, Specificity } from "./common.ts";
|
|
|
|
interface CharsetSpecificity extends Specificity {
|
|
charset: string;
|
|
}
|
|
|
|
const SIMPLE_CHARSET_REGEXP = /^\s*([^\s;]+)\s*(?:;(.*))?$/;
|
|
|
|
function parseCharset(str: string, i: number): CharsetSpecificity | undefined {
|
|
const match = SIMPLE_CHARSET_REGEXP.exec(str);
|
|
if (!match) {
|
|
return;
|
|
}
|
|
|
|
const [, charset] = match;
|
|
let q = 1;
|
|
if (match[2]) {
|
|
const params = match[2].split(";");
|
|
for (const param of params) {
|
|
const [key, value] = param.trim().split("=");
|
|
if (key === "q") {
|
|
q = parseFloat(value);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return { charset, q, i };
|
|
}
|
|
|
|
function parseAcceptCharset(accept: string): CharsetSpecificity[] {
|
|
const accepts = accept.split(",");
|
|
const result: CharsetSpecificity[] = [];
|
|
|
|
for (let i = 0; i < accepts.length; i++) {
|
|
const charset = parseCharset(accepts[i].trim(), i);
|
|
if (charset) {
|
|
result.push(charset);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
function specify(
|
|
charset: string,
|
|
spec: CharsetSpecificity,
|
|
i: number,
|
|
): Specificity | undefined {
|
|
let s = 0;
|
|
if (spec.charset.toLowerCase() === charset.toLocaleLowerCase()) {
|
|
s |= 1;
|
|
} else if (spec.charset !== "*") {
|
|
return;
|
|
}
|
|
|
|
return { i, o: spec.i, q: spec.q, s };
|
|
}
|
|
|
|
function getCharsetPriority(
|
|
charset: string,
|
|
accepted: CharsetSpecificity[],
|
|
index: number,
|
|
): Specificity {
|
|
let priority: Specificity = { i: -1, o: -1, q: 0, s: 0 };
|
|
for (const accepts of accepted) {
|
|
const spec = specify(charset, accepts, index);
|
|
if (
|
|
spec &&
|
|
((priority.s ?? 0) - (spec.s ?? 0) || priority.q - spec.q ||
|
|
(priority.o ?? 0) - (spec.o ?? 0)) < 0
|
|
) {
|
|
priority = spec;
|
|
}
|
|
}
|
|
return priority;
|
|
}
|
|
|
|
export function preferredCharsets(accept = "*", provided?: string[]): string[] {
|
|
const accepts = parseAcceptCharset(accept);
|
|
|
|
if (!provided) {
|
|
return accepts
|
|
.filter(isQuality)
|
|
.sort(compareSpecs)
|
|
.map((spec) => spec.charset);
|
|
}
|
|
|
|
const priorities = provided
|
|
.map((type, index) => getCharsetPriority(type, accepts, index));
|
|
|
|
return priorities
|
|
.filter(isQuality)
|
|
.sort(compareSpecs)
|
|
.map((priority) => provided[priorities.indexOf(priority)]);
|
|
}
|