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250 lines
10 KiB
250 lines
10 KiB
(function (global, factory) {
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typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
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typeof define === 'function' && define.amd ? define(factory) :
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(global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.resolveURI = factory());
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})(this, (function () { 'use strict';
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// Matches the scheme of a URL, eg "http://"
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const schemeRegex = /^[\w+.-]+:\/\//;
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/**
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* Matches the parts of a URL:
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* 1. Scheme, including ":", guaranteed.
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* 2. User/password, including "@", optional.
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* 3. Host, guaranteed.
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* 4. Port, including ":", optional.
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* 5. Path, including "/", optional.
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* 6. Query, including "?", optional.
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* 7. Hash, including "#", optional.
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*/
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const urlRegex = /^([\w+.-]+:)\/\/([^@/#?]*@)?([^:/#?]*)(:\d+)?(\/[^#?]*)?(\?[^#]*)?(#.*)?/;
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/**
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* File URLs are weird. They dont' need the regular `//` in the scheme, they may or may not start
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* with a leading `/`, they can have a domain (but only if they don't start with a Windows drive).
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*
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* 1. Host, optional.
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* 2. Path, which may include "/", guaranteed.
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* 3. Query, including "?", optional.
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* 4. Hash, including "#", optional.
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*/
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const fileRegex = /^file:(?:\/\/((?![a-z]:)[^/#?]*)?)?(\/?[^#?]*)(\?[^#]*)?(#.*)?/i;
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var UrlType;
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(function (UrlType) {
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UrlType[UrlType["Empty"] = 1] = "Empty";
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UrlType[UrlType["Hash"] = 2] = "Hash";
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UrlType[UrlType["Query"] = 3] = "Query";
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UrlType[UrlType["RelativePath"] = 4] = "RelativePath";
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UrlType[UrlType["AbsolutePath"] = 5] = "AbsolutePath";
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UrlType[UrlType["SchemeRelative"] = 6] = "SchemeRelative";
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UrlType[UrlType["Absolute"] = 7] = "Absolute";
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})(UrlType || (UrlType = {}));
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function isAbsoluteUrl(input) {
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return schemeRegex.test(input);
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}
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function isSchemeRelativeUrl(input) {
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return input.startsWith('//');
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}
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function isAbsolutePath(input) {
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return input.startsWith('/');
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}
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function isFileUrl(input) {
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return input.startsWith('file:');
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}
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function isRelative(input) {
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return /^[.?#]/.test(input);
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}
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function parseAbsoluteUrl(input) {
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const match = urlRegex.exec(input);
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return makeUrl(match[1], match[2] || '', match[3], match[4] || '', match[5] || '/', match[6] || '', match[7] || '');
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}
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function parseFileUrl(input) {
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const match = fileRegex.exec(input);
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const path = match[2];
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return makeUrl('file:', '', match[1] || '', '', isAbsolutePath(path) ? path : '/' + path, match[3] || '', match[4] || '');
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}
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function makeUrl(scheme, user, host, port, path, query, hash) {
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return {
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scheme,
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user,
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host,
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port,
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path,
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query,
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hash,
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type: UrlType.Absolute,
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};
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}
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function parseUrl(input) {
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if (isSchemeRelativeUrl(input)) {
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const url = parseAbsoluteUrl('http:' + input);
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url.scheme = '';
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url.type = UrlType.SchemeRelative;
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return url;
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}
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if (isAbsolutePath(input)) {
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const url = parseAbsoluteUrl('http://foo.com' + input);
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url.scheme = '';
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url.host = '';
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url.type = UrlType.AbsolutePath;
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return url;
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}
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if (isFileUrl(input))
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return parseFileUrl(input);
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if (isAbsoluteUrl(input))
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return parseAbsoluteUrl(input);
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const url = parseAbsoluteUrl('http://foo.com/' + input);
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url.scheme = '';
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url.host = '';
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url.type = input
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? input.startsWith('?')
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? UrlType.Query
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: input.startsWith('#')
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? UrlType.Hash
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: UrlType.RelativePath
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: UrlType.Empty;
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return url;
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}
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function stripPathFilename(path) {
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// If a path ends with a parent directory "..", then it's a relative path with excess parent
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// paths. It's not a file, so we can't strip it.
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if (path.endsWith('/..'))
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return path;
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const index = path.lastIndexOf('/');
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return path.slice(0, index + 1);
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}
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function mergePaths(url, base) {
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normalizePath(base, base.type);
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// If the path is just a "/", then it was an empty path to begin with (remember, we're a relative
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// path).
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if (url.path === '/') {
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url.path = base.path;
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}
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else {
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// Resolution happens relative to the base path's directory, not the file.
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url.path = stripPathFilename(base.path) + url.path;
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}
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}
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/**
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* The path can have empty directories "//", unneeded parents "foo/..", or current directory
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* "foo/.". We need to normalize to a standard representation.
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*/
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function normalizePath(url, type) {
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const rel = type <= UrlType.RelativePath;
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const pieces = url.path.split('/');
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// We need to preserve the first piece always, so that we output a leading slash. The item at
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// pieces[0] is an empty string.
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let pointer = 1;
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// Positive is the number of real directories we've output, used for popping a parent directory.
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// Eg, "foo/bar/.." will have a positive 2, and we can decrement to be left with just "foo".
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let positive = 0;
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// We need to keep a trailing slash if we encounter an empty directory (eg, splitting "foo/" will
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// generate `["foo", ""]` pieces). And, if we pop a parent directory. But once we encounter a
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// real directory, we won't need to append, unless the other conditions happen again.
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let addTrailingSlash = false;
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for (let i = 1; i < pieces.length; i++) {
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const piece = pieces[i];
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// An empty directory, could be a trailing slash, or just a double "//" in the path.
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if (!piece) {
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addTrailingSlash = true;
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continue;
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}
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// If we encounter a real directory, then we don't need to append anymore.
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addTrailingSlash = false;
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// A current directory, which we can always drop.
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if (piece === '.')
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continue;
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// A parent directory, we need to see if there are any real directories we can pop. Else, we
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// have an excess of parents, and we'll need to keep the "..".
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if (piece === '..') {
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if (positive) {
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addTrailingSlash = true;
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positive--;
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pointer--;
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}
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else if (rel) {
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// If we're in a relativePath, then we need to keep the excess parents. Else, in an absolute
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// URL, protocol relative URL, or an absolute path, we don't need to keep excess.
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pieces[pointer++] = piece;
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}
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continue;
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}
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// We've encountered a real directory. Move it to the next insertion pointer, which accounts for
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// any popped or dropped directories.
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pieces[pointer++] = piece;
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positive++;
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}
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let path = '';
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for (let i = 1; i < pointer; i++) {
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path += '/' + pieces[i];
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}
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if (!path || (addTrailingSlash && !path.endsWith('/..'))) {
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path += '/';
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}
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url.path = path;
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}
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/**
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* Attempts to resolve `input` URL/path relative to `base`.
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*/
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function resolve(input, base) {
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if (!input && !base)
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return '';
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const url = parseUrl(input);
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let inputType = url.type;
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if (base && inputType !== UrlType.Absolute) {
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const baseUrl = parseUrl(base);
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const baseType = baseUrl.type;
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switch (inputType) {
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case UrlType.Empty:
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url.hash = baseUrl.hash;
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// fall through
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case UrlType.Hash:
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url.query = baseUrl.query;
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// fall through
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case UrlType.Query:
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case UrlType.RelativePath:
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mergePaths(url, baseUrl);
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// fall through
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case UrlType.AbsolutePath:
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// The host, user, and port are joined, you can't copy one without the others.
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url.user = baseUrl.user;
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url.host = baseUrl.host;
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url.port = baseUrl.port;
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// fall through
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case UrlType.SchemeRelative:
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// The input doesn't have a schema at least, so we need to copy at least that over.
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url.scheme = baseUrl.scheme;
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}
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if (baseType > inputType)
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inputType = baseType;
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}
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normalizePath(url, inputType);
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const queryHash = url.query + url.hash;
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switch (inputType) {
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// This is impossible, because of the empty checks at the start of the function.
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// case UrlType.Empty:
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case UrlType.Hash:
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case UrlType.Query:
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return queryHash;
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case UrlType.RelativePath: {
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// The first char is always a "/", and we need it to be relative.
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const path = url.path.slice(1);
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if (!path)
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return queryHash || '.';
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if (isRelative(base || input) && !isRelative(path)) {
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// If base started with a leading ".", or there is no base and input started with a ".",
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// then we need to ensure that the relative path starts with a ".". We don't know if
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// relative starts with a "..", though, so check before prepending.
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return './' + path + queryHash;
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}
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return path + queryHash;
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}
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case UrlType.AbsolutePath:
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return url.path + queryHash;
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default:
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return url.scheme + '//' + url.user + url.host + url.port + url.path + queryHash;
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}
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}
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return resolve;
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}));
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//# sourceMappingURL=resolve-uri.umd.js.map
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