198 lines
7.3 KiB
JavaScript
198 lines
7.3 KiB
JavaScript
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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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export { resolve as default };
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//# sourceMappingURL=resolve-uri.mjs.map
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