forked from M3-Academy/challenge-algorithms-v2.0
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14 KiB
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{"version":3,"file":"resolve-uri.umd.js","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. 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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 \".\". 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