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