deno.land / std@0.166.0 / media_types / _util.ts

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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
/** Supporting functions for media_types that do not make part of the public * API. * * @module * @private */
export function consumeToken(v: string): [token: string, rest: string] { const notPos = indexOf(v, isNotTokenChar); if (notPos == -1) { return [v, ""]; } if (notPos == 0) { return ["", v]; } return [v.slice(0, notPos), v.slice(notPos)];}
export function consumeValue(v: string): [value: string, rest: string] { if (!v) { return ["", v]; } if (v[0] !== `"`) { return consumeToken(v); } let value = ""; for (let i = 1; i < v.length; i++) { const r = v[i]; if (r === `"`) { return [value, v.slice(i + 1)]; } if (r === "\\" && i + 1 < v.length && isTSpecial(v[i + 1])) { value += v[i + 1]; i++; continue; } if (r === "\r" || r === "\n") { return ["", v]; } value += v[i]; } return ["", v];}
export function consumeMediaParam( v: string,): [key: string, value: string, rest: string] { let rest = v.trimStart(); if (!rest.startsWith(";")) { return ["", "", v]; } rest = rest.slice(1); rest = rest.trimStart(); let param: string; [param, rest] = consumeToken(rest); param = param.toLowerCase(); if (!param) { return ["", "", v]; } rest = rest.slice(1); rest = rest.trimStart(); const [value, rest2] = consumeValue(rest); if (value == "" && rest2 === rest) { return ["", "", v]; } rest = rest2; return [param, value, rest];}
export function decode2331Encoding(v: string): string | undefined { const sv = v.split(`'`, 3); if (sv.length !== 3) { return undefined; } const charset = sv[0].toLowerCase(); if (!charset) { return undefined; } if (charset != "us-ascii" && charset != "utf-8") { return undefined; } const encv = decodeURI(sv[2]); if (!encv) { return undefined; } return encv;}
function indexOf<T>(s: Iterable<T>, fn: (s: T) => boolean): number { let i = -1; for (const v of s) { i++; if (fn(v)) { return i; } } return -1;}
export function isIterator<T>(obj: unknown): obj is Iterable<T> { if (obj == null) { return false; } // deno-lint-ignore no-explicit-any return typeof (obj as any)[Symbol.iterator] === "function";}
export function isToken(s: string): boolean { if (!s) { return false; } return indexOf(s, isNotTokenChar) < 0;}
function isNotTokenChar(r: string): boolean { return !isTokenChar(r);}
function isTokenChar(r: string): boolean { const code = r.charCodeAt(0); return code > 0x20 && code < 0x7f && !isTSpecial(r);}
function isTSpecial(r: string): boolean { return `()<>@,;:\\"/[]?=`.includes(r[0]);}
const CHAR_CODE_SPACE = " ".charCodeAt(0);const CHAR_CODE_TILDE = "~".charCodeAt(0);
export function needsEncoding(s: string): boolean { for (const b of s) { const charCode = b.charCodeAt(0); if ( (charCode < CHAR_CODE_SPACE || charCode > CHAR_CODE_TILDE) && b !== "\t" ) { return true; } } return false;}
std
Deno standard library
GitHub Repositorydenoland/deno_std
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2458

Version Info

Tagged at
2 months ago