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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() && 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