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