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this is just a very light wrapper around 2 arrays with an offset index\n\nimport { GLOBSTAR } from 'minimatch'\nexport type MMPattern = string | RegExp | typeof GLOBSTAR\n\n// an array of length >= 1\nexport type PatternList = [p: MMPattern, ...rest: MMPattern[]]\nexport type UNCPatternList = [\n  p0: '',\n  p1: '',\n  p2: string,\n  p3: string,\n  ...rest: MMPattern[],\n]\nexport type DrivePatternList = [p0: string, ...rest: MMPattern[]]\nexport type AbsolutePatternList = [p0: '', ...rest: MMPattern[]]\nexport type GlobList = [p: string, ...rest: string[]]\n\nconst isPatternList = (pl: MMPattern[]): pl is PatternList =>\n  pl.length >= 1\nconst isGlobList = (gl: string[]): gl is GlobList => gl.length >= 1\n\n/**\n * An immutable-ish view on an array of glob parts and their parsed\n * results\n */\nexport class Pattern {\n  readonly #patternList: PatternList\n  readonly #globList: GlobList\n  readonly #index: number\n  readonly length: number\n  readonly #platform: NodeJS.Platform\n  #rest?: Pattern | null\n  #globString?: string\n  #isDrive?: boolean\n  #isUNC?: boolean\n  #isAbsolute?: boolean\n  #followGlobstar: boolean = true\n\n  constructor(\n    patternList: MMPattern[],\n    globList: string[],\n    index: number,\n    platform: NodeJS.Platform,\n  ) {\n    if (!isPatternList(patternList)) {\n      throw new TypeError('empty pattern list')\n    }\n    if (!isGlobList(globList)) {\n      throw new TypeError('empty glob list')\n    }\n    if (globList.length !== patternList.length) {\n      throw new TypeError('mismatched pattern list and glob list lengths')\n    }\n    this.length = patternList.length\n    if (index < 0 || index >= this.length) {\n      throw new TypeError('index out of range')\n    }\n    this.#patternList = patternList\n    this.#globList = globList\n    this.#index = index\n    this.#platform = platform\n\n    // normalize root entries of absolute patterns on initial creation.\n    if (this.#index === 0) {\n      // c: => ['c:/']\n      // C:/ => ['C:/']\n      // C:/x => ['C:/', 'x']\n      // //host/share => ['//host/share/']\n      // //host/share/ => ['//host/share/']\n      // //host/share/x => ['//host/share/', 'x']\n      // /etc => ['/', 'etc']\n      // / => ['/']\n      if (this.isUNC()) {\n        // '' / '' / 'host' / 'share'\n        const [p0, p1, p2, p3, ...prest] = this.#patternList\n        const [g0, g1, g2, g3, ...grest] = this.#globList\n        if (prest[0] === '') {\n          // ends in /\n          prest.shift()\n          grest.shift()\n        }\n        const p = [p0, p1, p2, p3, ''].join('/')\n        const g = [g0, g1, g2, g3, ''].join('/')\n        this.#patternList = [p, ...prest]\n        this.#globList = [g, ...grest]\n        this.length = this.#patternList.length\n      } else if (this.isDrive() || this.isAbsolute()) {\n        const [p1, ...prest] = this.#patternList\n        const [g1, ...grest] = this.#globList\n        if (prest[0] === '') {\n          // ends in /\n          prest.shift()\n          grest.shift()\n        }\n        const p = (p1 as string) + '/'\n        const g = g1 + '/'\n        this.#patternList = [p, ...prest]\n        this.#globList = [g, ...grest]\n        this.length = this.#patternList.length\n      }\n    }\n  }\n\n  /**\n   * The first entry in the parsed list of patterns\n   */\n  pattern(): MMPattern {\n    return this.#patternList[this.#index] as MMPattern\n  }\n\n  /**\n   * true of if pattern() returns a string\n   */\n  isString(): boolean {\n    return typeof this.#patternList[this.#index] === 'string'\n  }\n  /**\n   * true of if pattern() returns GLOBSTAR\n   */\n  isGlobstar(): boolean {\n    return this.#patternList[this.#index] === GLOBSTAR\n  }\n  /**\n   * true if pattern() returns a regexp\n   */\n  isRegExp(): boolean {\n    return this.#patternList[this.#index] instanceof RegExp\n  }\n\n  /**\n   * The /-joined set of glob parts that make up this pattern\n   */\n  globString(): string {\n    return (this.#globString =\n      this.#globString ||\n      (this.#index === 0 ?\n        this.isAbsolute() ?\n          this.#globList[0] + this.#globList.slice(1).join('/')\n        : this.#globList.join('/')\n      : this.#globList.slice(this.#index).join('/')))\n  }\n\n  /**\n   * true if there are more pattern parts after this one\n   */\n  hasMore(): boolean {\n    return this.length > this.#index + 1\n  }\n\n  /**\n   * The rest of the pattern after this part, or null if this is the end\n   */\n  rest(): Pattern | null {\n    if (this.#rest !== undefined) return this.#rest\n    if (!this.hasMore()) return (this.#rest = null)\n    this.#rest = new Pattern(\n      this.#patternList,\n      this.#globList,\n      this.#index + 1,\n      this.#platform,\n    )\n    this.#rest.#isAbsolute = this.#isAbsolute\n    this.#rest.#isUNC = this.#isUNC\n    this.#rest.#isDrive = this.#isDrive\n    return this.#rest\n  }\n\n  /**\n   * true if the pattern represents a //unc/path/ on windows\n   */\n  isUNC(): boolean {\n    const pl = this.#patternList\n    return this.#isUNC !== undefined ?\n        this.#isUNC\n      : (this.#isUNC =\n          this.#platform === 'win32' &&\n          this.#index === 0 &&\n          pl[0] === '' &&\n          pl[1] === '' &&\n          typeof pl[2] === 'string' &&\n          !!pl[2] &&\n          typeof pl[3] === 'string' &&\n          !!pl[3])\n  }\n\n  // pattern like C:/...\n  // split = ['C:', ...]\n  // XXX: would be nice to handle patterns like `c:*` to test the cwd\n  // in c: for *, but I don't know of a way to even figure out what that\n  // cwd is without actually chdir'ing into it?\n  /**\n   * True if the pattern starts with a drive letter on Windows\n   */\n  isDrive(): boolean {\n    const pl = this.#patternList\n    return this.#isDrive !== undefined ?\n        this.#isDrive\n      : (this.#isDrive =\n          this.#platform === 'win32' &&\n          this.#index === 0 &&\n          this.length > 1 &&\n          typeof pl[0] === 'string' &&\n          /^[a-z]:$/i.test(pl[0]))\n  }\n\n  // pattern = '/' or '/...' or '/x/...'\n  // split = ['', ''] or ['', ...] or ['', 'x', ...]\n  // Drive and UNC both considered absolute on windows\n  /**\n   * True if the pattern is rooted on an absolute path\n   */\n  isAbsolute(): boolean {\n    const pl = this.#patternList\n    return this.#isAbsolute !== undefined ?\n        this.#isAbsolute\n      : (this.#isAbsolute =\n          (pl[0] === '' && pl.length > 1) ||\n          this.isDrive() ||\n          this.isUNC())\n  }\n\n  /**\n   * consume the root of the pattern, and return it\n   */\n  root(): string {\n    const p = this.#patternList[0]\n    return (\n        typeof p === 'string' && this.isAbsolute() && this.#index === 0\n      ) ?\n        p\n      : ''\n  }\n\n  /**\n   * Check to see if the current globstar pattern is allowed to follow\n   * a symbolic link.\n   */\n  checkFollowGlobstar(): boolean {\n    return !(\n      this.#index === 0 ||\n      !this.isGlobstar() ||\n      !this.#followGlobstar\n    )\n  }\n\n  /**\n   * Mark that the current globstar pattern is following a symbolic link\n   */\n  markFollowGlobstar(): boolean {\n    if (this.#index === 0 || !this.isGlobstar() || !this.#followGlobstar)\n      return false\n    this.#followGlobstar = false\n    return true\n  }\n}\n"]}