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app_vue/node_modules/webpack/lib/util/URLAbsoluteSpecifier.js

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+/*
+	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;
+	}
+
+	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;
+		ch = specifier.charCodeAt(i);
+	}
+
+	// Scheme must end with colon
+	if (ch !== colonCharCode) return;
+
+	// 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;
+		}
+	}
+
+	return specifier.slice(0, i).toLowerCase();
+}
+
+/**
+ * @param {string} specifier specifier
+ * @returns {string | null | undefined} protocol if absolute URL specifier provided
+ */
+function getProtocol(specifier) {
+	const scheme = getScheme(specifier);
+	return scheme === undefined ? undefined : `${scheme}:`;
+}
+
+module.exports.getScheme = getScheme;
+module.exports.getProtocol = getProtocol;