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synchronous utility for filtering entries and calculating subwalks\n\nimport { GLOBSTAR, MMRegExp } from 'minimatch'\nimport { Path } from 'path-scurry'\nimport { MMPattern, Pattern } from './pattern.js'\nimport { GlobWalkerOpts } from './walker.js'\n\n/**\n * A cache of which patterns have been processed for a given Path\n */\nexport class HasWalkedCache {\n  store: Map<string, Set<string>>\n  constructor(store: Map<string, Set<string>> = new Map()) {\n    this.store = store\n  }\n  copy() {\n    return new HasWalkedCache(new Map(this.store))\n  }\n  hasWalked(target: Path, pattern: Pattern) {\n    return this.store.get(target.fullpath())?.has(pattern.globString())\n  }\n  storeWalked(target: Path, pattern: Pattern) {\n    const fullpath = target.fullpath()\n    const cached = this.store.get(fullpath)\n    if (cached) cached.add(pattern.globString())\n    else this.store.set(fullpath, new Set([pattern.globString()]))\n  }\n}\n\n/**\n * A record of which paths have been matched in a given walk step,\n * and whether they only are considered a match if they are a directory,\n * and whether their absolute or relative path should be returned.\n */\nexport class MatchRecord {\n  store: Map<Path, number> = new Map()\n  add(target: Path, absolute: boolean, ifDir: boolean) {\n    const n = (absolute ? 2 : 0) | (ifDir ? 1 : 0)\n    const current = this.store.get(target)\n    this.store.set(target, current === undefined ? n : n & current)\n  }\n  // match, absolute, ifdir\n  entries(): [Path, boolean, boolean][] {\n    return [...this.store.entries()].map(([path, n]) => [\n      path,\n      !!(n & 2),\n      !!(n & 1),\n    ])\n  }\n}\n\n/**\n * A collection of patterns that must be processed in a subsequent step\n * for a given path.\n */\nexport class SubWalks {\n  store: Map<Path, Pattern[]> = new Map()\n  add(target: Path, pattern: Pattern) {\n    if (!target.canReaddir()) {\n      return\n    }\n    const subs = this.store.get(target)\n    if (subs) {\n      if (!subs.find(p => p.globString() === pattern.globString())) {\n        subs.push(pattern)\n      }\n    } else this.store.set(target, [pattern])\n  }\n  get(target: Path): Pattern[] {\n    const subs = this.store.get(target)\n    /* c8 ignore start */\n    if (!subs) {\n      throw new Error('attempting to walk unknown path')\n    }\n    /* c8 ignore stop */\n    return subs\n  }\n  entries(): [Path, Pattern[]][] {\n    return this.keys().map(k => [k, this.store.get(k) as Pattern[]])\n  }\n  keys(): Path[] {\n    return [...this.store.keys()].filter(t => t.canReaddir())\n  }\n}\n\n/**\n * The class that processes patterns for a given path.\n *\n * Handles child entry filtering, and determining whether a path's\n * directory contents must be read.\n */\nexport class Processor {\n  hasWalkedCache: HasWalkedCache\n  matches = new MatchRecord()\n  subwalks = new SubWalks()\n  patterns?: Pattern[]\n  follow: boolean\n  dot: boolean\n  opts: GlobWalkerOpts\n\n  constructor(opts: GlobWalkerOpts, hasWalkedCache?: HasWalkedCache) {\n    this.opts = opts\n    this.follow = !!opts.follow\n    this.dot = !!opts.dot\n    this.hasWalkedCache =\n      hasWalkedCache ? hasWalkedCache.copy() : new HasWalkedCache()\n  }\n\n  processPatterns(target: Path, patterns: Pattern[]) {\n    this.patterns = patterns\n    const processingSet: [Path, Pattern][] = patterns.map(p => [target, p])\n\n    // map of paths to the magic-starting subwalks they need to walk\n    // first item in patterns is the filter\n\n    for (let [t, pattern] of processingSet) {\n      this.hasWalkedCache.storeWalked(t, pattern)\n\n      const root = pattern.root()\n      const absolute = pattern.isAbsolute() && this.opts.absolute !== false\n\n      // start absolute patterns at root\n      if (root) {\n        t = t.resolve(\n          root === '/' && this.opts.root !== undefined ?\n            this.opts.root\n          : root,\n        )\n        const rest = pattern.rest()\n        if (!rest) {\n          this.matches.add(t, true, false)\n          continue\n        } else {\n          pattern = rest\n        }\n      }\n\n      if (t.isENOENT()) continue\n\n      let p: MMPattern\n      let rest: Pattern | null\n      let changed = false\n      while (\n        typeof (p = pattern.pattern()) === 'string' &&\n        (rest = pattern.rest())\n      ) {\n        const c = t.resolve(p)\n        t = c\n        pattern = rest\n        changed = true\n      }\n      p = pattern.pattern()\n      rest = pattern.rest()\n      if (changed) {\n        if (this.hasWalkedCache.hasWalked(t, pattern)) continue\n        this.hasWalkedCache.storeWalked(t, pattern)\n      }\n\n      // now we have either a final string for a known entry,\n      // more strings for an unknown entry,\n      // or a pattern starting with magic, mounted on t.\n      if (typeof p === 'string') {\n        // must not be final entry, otherwise we would have\n        // concatenated it earlier.\n        const ifDir = p === '..' || p === '' || p === '.'\n        this.matches.add(t.resolve(p), absolute, ifDir)\n        continue\n      } else if (p === GLOBSTAR) {\n        // if no rest, match and subwalk pattern\n        // if rest, process rest and subwalk pattern\n        // if it's a symlink, but we didn't get here by way of a\n        // globstar match (meaning it's the first time THIS globstar\n        // has traversed a symlink), then we follow it. Otherwise, stop.\n        if (\n          !t.isSymbolicLink() ||\n          this.follow ||\n          pattern.checkFollowGlobstar()\n        ) {\n          this.subwalks.add(t, pattern)\n        }\n        const rp = rest?.pattern()\n        const rrest = rest?.rest()\n        if (!rest || ((rp === '' || rp === '.') && !rrest)) {\n          // only HAS to be a dir if it ends in **/ or **/.\n          // but ending in ** will match files as well.\n          this.matches.add(t, absolute, rp === '' || rp === '.')\n        } else {\n          if (rp === '..') {\n            // this would mean you're matching **/.. at the fs root,\n            // and no thanks, I'm not gonna test that specific case.\n            /* c8 ignore start */\n            const tp = t.parent || t\n            /* c8 ignore stop */\n            if (!rrest) this.matches.add(tp, absolute, true)\n            else if (!this.hasWalkedCache.hasWalked(tp, rrest)) {\n              this.subwalks.add(tp, rrest)\n            }\n          }\n        }\n      } else if (p instanceof RegExp) {\n        this.subwalks.add(t, pattern)\n      }\n    }\n\n    return this\n  }\n\n  subwalkTargets(): Path[] {\n    return this.subwalks.keys()\n  }\n\n  child() {\n    return new Processor(this.opts, this.hasWalkedCache)\n  }\n\n  // return a new Processor containing the subwalks for each\n  // child entry, and a set of matches, and\n  // a hasWalkedCache that's a copy of this one\n  // then we're going to call\n  filterEntries(parent: Path, entries: Path[]): Processor {\n    const patterns = this.subwalks.get(parent)\n    // put matches and entry walks into the results processor\n    const results = this.child()\n    for (const e of entries) {\n      for (const pattern of patterns) {\n        const absolute = pattern.isAbsolute()\n        const p = pattern.pattern()\n        const rest = pattern.rest()\n        if (p === GLOBSTAR) {\n          results.testGlobstar(e, pattern, rest, absolute)\n        } else if (p instanceof RegExp) {\n          results.testRegExp(e, p, rest, absolute)\n        } else {\n          results.testString(e, p, rest, absolute)\n        }\n      }\n    }\n    return results\n  }\n\n  testGlobstar(\n    e: Path,\n    pattern: Pattern,\n    rest: Pattern | null,\n    absolute: boolean,\n  ) {\n    if (this.dot || !e.name.startsWith('.')) {\n      if (!pattern.hasMore()) {\n        this.matches.add(e, absolute, false)\n      }\n      if (e.canReaddir()) {\n        // if we're in follow mode or it's not a symlink, just keep\n        // testing the same pattern. If there's more after the globstar,\n        // then this symlink consumes the globstar. If not, then we can\n        // follow at most ONE symlink along the way, so we mark it, which\n        // also checks to ensure that it wasn't already marked.\n        if (this.follow || !e.isSymbolicLink()) {\n          this.subwalks.add(e, pattern)\n        } else if (e.isSymbolicLink()) {\n          if (rest && pattern.checkFollowGlobstar()) {\n            this.subwalks.add(e, rest)\n          } else if (pattern.markFollowGlobstar()) {\n            this.subwalks.add(e, pattern)\n          }\n        }\n      }\n    }\n    // if the NEXT thing matches this entry, then also add\n    // the rest.\n    if (rest) {\n      const rp = rest.pattern()\n      if (\n        typeof rp === 'string' &&\n        // dots and empty were handled already\n        rp !== '..' &&\n        rp !== '' &&\n        rp !== '.'\n      ) {\n        this.testString(e, rp, rest.rest(), absolute)\n      } else if (rp === '..') {\n        /* c8 ignore start */\n        const ep = e.parent || e\n        /* c8 ignore stop */\n        this.subwalks.add(ep, rest)\n      } else if (rp instanceof RegExp) {\n        this.testRegExp(e, rp, rest.rest(), absolute)\n      }\n    }\n  }\n\n  testRegExp(\n    e: Path,\n    p: MMRegExp,\n    rest: Pattern | null,\n    absolute: boolean,\n  ) {\n    if (!p.test(e.name)) return\n    if (!rest) {\n      this.matches.add(e, absolute, false)\n    } else {\n      this.subwalks.add(e, rest)\n    }\n  }\n\n  testString(e: Path, p: string, rest: Pattern | null, absolute: boolean) {\n    // should never happen?\n    if (!e.isNamed(p)) return\n    if (!rest) {\n      this.matches.add(e, absolute, false)\n    } else {\n      this.subwalks.add(e, rest)\n    }\n  }\n}\n"]}