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205 lines
8.4 KiB
205 lines
8.4 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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*/ |
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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 inclue "/", guaranteed. |
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*/ |
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const fileRegex = /^file:(?:\/\/((?![a-z]:)[^/]*)?)?(\/?.*)/i; |
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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 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] || '/'); |
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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); |
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} |
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function makeUrl(scheme, user, host, port, path) { |
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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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relativePath: false, |
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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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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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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.relativePath = true; |
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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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// If we're not a relative path, then we're an absolute path, and it doesn't matter what base is. |
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if (!url.relativePath) |
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return; |
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normalizePath(base); |
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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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// If the base path is absolute, then our path is now absolute too. |
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url.relativePath = base.relativePath; |
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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) { |
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const { relativePath } = url; |
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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 (relativePath) { |
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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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// If we have a base, and the input isn't already an absolute URL, then we need to merge. |
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if (base && !url.scheme) { |
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const baseUrl = parseUrl(base); |
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url.scheme = baseUrl.scheme; |
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// If there's no host, then we were just a path. |
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if (!url.host) { |
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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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} |
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mergePaths(url, baseUrl); |
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} |
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normalizePath(url); |
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// If the input (and base, if there was one) are both relative, then we need to output a relative. |
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if (url.relativePath) { |
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// The first char is always a "/". |
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const path = url.path.slice(1); |
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if (!path) |
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return '.'; |
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// If base started with a leading ".", or there is no base and input started with a ".", then we |
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// need to ensure that the relative path starts with a ".". We don't know if relative starts |
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// with a "..", though, so check before prepending. |
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const keepRelative = (base || input).startsWith('.'); |
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return !keepRelative || path.startsWith('.') ? path : './' + path; |
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} |
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// If there's no host (and no scheme/user/port), then we need to output an absolute path. |
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if (!url.scheme && !url.host) |
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return url.path; |
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// We're outputting either an absolute URL, or a protocol relative one. |
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return `${url.scheme}//${url.user}${url.host}${url.port}${url.path}`; |
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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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