{"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 */\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 inclue \"/\", guaranteed.\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  relativePath: boolean;\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 parseAbsoluteUrl(input: string): Url {\n  const match = urlRegex.exec(input)!;\n  return makeUrl(match[1], match[2] || '', match[3], match[4] || '', match[5] || '/');\n}\n\nfunction parseFileUrl(input: string): Url {\n  const match = fileRegex.exec(input)!;\n  const path = match[2];\n  return makeUrl('file:', '', match[1] || '', '', isAbsolutePath(path) ? path : '/' + path);\n}\n\nfunction makeUrl(scheme: string, user: string, host: string, port: string, path: string): Url {\n  return {\n    scheme,\n    user,\n    host,\n    port,\n    path,\n    relativePath: false,\n  };\n}\n\nfunction parseUrl(input: string): Url {\n  if (isSchemeRelativeUrl(input)) {\n    const url = parseAbsoluteUrl('http:' + input);\n    url.scheme = '';\n    return url;\n  }\n\n  if (isAbsolutePath(input)) {\n    const url = parseAbsoluteUrl('http://foo.com' + input);\n    url.scheme = '';\n    url.host = '';\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.relativePath = true;\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  // If we're not a relative path, then we're an absolute path, and it doesn't matter what base is.\n  if (!url.relativePath) return;\n\n  normalizePath(base);\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  // If the base path is absolute, then our path is now absolute too.\n  url.relativePath = base.relativePath;\n}\n\n/**\n * The path can have empty directories \"//\", unneeded parents \"foo/..\", or current directory\n * \"foo/.\". 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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 (relativePath) {\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\n  // If we have a base, and the input isn't already an absolute URL, then we need to merge.\n  if (base && !url.scheme) {\n    const baseUrl = parseUrl(base);\n    url.scheme = baseUrl.scheme;\n    // If there's no host, then we were just a path.\n    if (!url.host) {\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    }\n    mergePaths(url, baseUrl);\n  }\n\n  normalizePath(url);\n\n  // If the input (and base, if there was one) are both relative, then we need to output a relative.\n  if (url.relativePath) {\n    // The first char is always a \"/\".\n    const path = url.path.slice(1);\n    if (!path) return '.';\n\n    // If base started with a leading \".\", or there is no base and input started with a \".\", then we\n    // need to ensure that the relative path starts with a \".\". 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