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87 lines
2.5 KiB
87 lines
2.5 KiB
/* |
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MIT License http://www.opensource.org/licenses/mit-license.php |
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Author Ivan Kopeykin @vankop |
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*/ |
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"use strict"; |
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/** @typedef {import("./fs").InputFileSystem} InputFileSystem */ |
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/** @typedef {(error: Error|null, result?: Buffer) => void} ErrorFirstCallback */ |
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const backSlashCharCode = "\\".charCodeAt(0); |
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const slashCharCode = "/".charCodeAt(0); |
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const aLowerCaseCharCode = "a".charCodeAt(0); |
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const zLowerCaseCharCode = "z".charCodeAt(0); |
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const aUpperCaseCharCode = "A".charCodeAt(0); |
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const zUpperCaseCharCode = "Z".charCodeAt(0); |
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const _0CharCode = "0".charCodeAt(0); |
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const _9CharCode = "9".charCodeAt(0); |
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const plusCharCode = "+".charCodeAt(0); |
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const hyphenCharCode = "-".charCodeAt(0); |
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const colonCharCode = ":".charCodeAt(0); |
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const hashCharCode = "#".charCodeAt(0); |
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const queryCharCode = "?".charCodeAt(0); |
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/** |
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* Get scheme if specifier is an absolute URL specifier |
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* e.g. Absolute specifiers like 'file:///user/webpack/index.js' |
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* https://tools.ietf.org/html/rfc3986#section-3.1 |
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* @param {string} specifier specifier |
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* @returns {string|undefined} scheme if absolute URL specifier provided |
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*/ |
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function getScheme(specifier) { |
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const start = specifier.charCodeAt(0); |
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// First char maybe only a letter |
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if ( |
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(start < aLowerCaseCharCode || start > zLowerCaseCharCode) && |
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(start < aUpperCaseCharCode || start > zUpperCaseCharCode) |
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) { |
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return undefined; |
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} |
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let i = 1; |
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let ch = specifier.charCodeAt(i); |
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while ( |
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(ch >= aLowerCaseCharCode && ch <= zLowerCaseCharCode) || |
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(ch >= aUpperCaseCharCode && ch <= zUpperCaseCharCode) || |
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(ch >= _0CharCode && ch <= _9CharCode) || |
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ch === plusCharCode || |
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ch === hyphenCharCode |
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) { |
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if (++i === specifier.length) return undefined; |
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ch = specifier.charCodeAt(i); |
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} |
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// Scheme must end with colon |
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if (ch !== colonCharCode) return undefined; |
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// Check for Windows absolute path |
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// https://url.spec.whatwg.org/#url-miscellaneous |
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if (i === 1) { |
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const nextChar = i + 1 < specifier.length ? specifier.charCodeAt(i + 1) : 0; |
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if ( |
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nextChar === 0 || |
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nextChar === backSlashCharCode || |
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nextChar === slashCharCode || |
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nextChar === hashCharCode || |
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nextChar === queryCharCode |
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) { |
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return undefined; |
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} |
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} |
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return specifier.slice(0, i).toLowerCase(); |
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} |
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/** |
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* @param {string} specifier specifier |
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* @returns {string|null} protocol if absolute URL specifier provided |
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*/ |
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function getProtocol(specifier) { |
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const scheme = getScheme(specifier); |
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return scheme === undefined ? undefined : scheme + ":"; |
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} |
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exports.getScheme = getScheme; |
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exports.getProtocol = getProtocol;
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