1 files changed, 468 insertions, 0 deletions
diff --git a/node_modules/lru-cache/index.js b/node_modules/lru-cache/index.js
new file mode 100644
index 0000000..bd35b53
--- /dev/null
+++ b/node_modules/lru-cache/index.js
@@ -0,0 +1,468 @@
+'use strict'
+
+module.exports = LRUCache
+
+// This will be a proper iterable 'Map' in engines that support it,
+// or a fakey-fake PseudoMap in older versions.
+var Map = require('pseudomap')
+var util = require('util')
+
+// A linked list to keep track of recently-used-ness
+var Yallist = require('yallist')
+
+// use symbols if possible, otherwise just _props
+var hasSymbol = typeof Symbol === 'function' && process.env._nodeLRUCacheForceNoSymbol !== '1'
+var makeSymbol
+if (hasSymbol) {
+  makeSymbol = function (key) {
+    return Symbol(key)
+  }
+} else {
+  makeSymbol = function (key) {
+    return '_' + key
+  }
+}
+
+var MAX = makeSymbol('max')
+var LENGTH = makeSymbol('length')
+var LENGTH_CALCULATOR = makeSymbol('lengthCalculator')
+var ALLOW_STALE = makeSymbol('allowStale')
+var MAX_AGE = makeSymbol('maxAge')
+var DISPOSE = makeSymbol('dispose')
+var NO_DISPOSE_ON_SET = makeSymbol('noDisposeOnSet')
+var LRU_LIST = makeSymbol('lruList')
+var CACHE = makeSymbol('cache')
+
+function naiveLength () { return 1 }
+
+// lruList is a yallist where the head is the youngest
+// item, and the tail is the oldest.  the list contains the Hit
+// objects as the entries.
+// Each Hit object has a reference to its Yallist.Node.  This
+// never changes.
+//
+// cache is a Map (or PseudoMap) that matches the keys to
+// the Yallist.Node object.
+function LRUCache (options) {
+  if (!(this instanceof LRUCache)) {
+    return new LRUCache(options)
+  }
+
+  if (typeof options === 'number') {
+    options = { max: options }
+  }
+
+  if (!options) {
+    options = {}
+  }
+
+  var max = this[MAX] = options.max
+  // Kind of weird to have a default max of Infinity, but oh well.
+  if (!max ||
+      !(typeof max === 'number') ||
+      max <= 0) {
+    this[MAX] = Infinity
+  }
+
+  var lc = options.length || naiveLength
+  if (typeof lc !== 'function') {
+    lc = naiveLength
+  }
+  this[LENGTH_CALCULATOR] = lc
+
+  this[ALLOW_STALE] = options.stale || false
+  this[MAX_AGE] = options.maxAge || 0
+  this[DISPOSE] = options.dispose
+  this[NO_DISPOSE_ON_SET] = options.noDisposeOnSet || false
+  this.reset()
+}
+
+// resize the cache when the max changes.
+Object.defineProperty(LRUCache.prototype, 'max', {
+  set: function (mL) {
+    if (!mL || !(typeof mL === 'number') || mL <= 0) {
+      mL = Infinity
+    }
+    this[MAX] = mL
+    trim(this)
+  },
+  get: function () {
+    return this[MAX]
+  },
+  enumerable: true
+})
+
+Object.defineProperty(LRUCache.prototype, 'allowStale', {
+  set: function (allowStale) {
+    this[ALLOW_STALE] = !!allowStale
+  },
+  get: function () {
+    return this[ALLOW_STALE]
+  },
+  enumerable: true
+})
+
+Object.defineProperty(LRUCache.prototype, 'maxAge', {
+  set: function (mA) {
+    if (!mA || !(typeof mA === 'number') || mA < 0) {
+      mA = 0
+    }
+    this[MAX_AGE] = mA
+    trim(this)
+  },
+  get: function () {
+    return this[MAX_AGE]
+  },
+  enumerable: true
+})
+
+// resize the cache when the lengthCalculator changes.
+Object.defineProperty(LRUCache.prototype, 'lengthCalculator', {
+  set: function (lC) {
+    if (typeof lC !== 'function') {
+      lC = naiveLength
+    }
+    if (lC !== this[LENGTH_CALCULATOR]) {
+      this[LENGTH_CALCULATOR] = lC
+      this[LENGTH] = 0
+      this[LRU_LIST].forEach(function (hit) {
+        hit.length = this[LENGTH_CALCULATOR](hit.value, hit.key)
+        this[LENGTH] += hit.length
+      }, this)
+    }
+    trim(this)
+  },
+  get: function () { return this[LENGTH_CALCULATOR] },
+  enumerable: true
+})
+
+Object.defineProperty(LRUCache.prototype, 'length', {
+  get: function () { return this[LENGTH] },
+  enumerable: true
+})
+
+Object.defineProperty(LRUCache.prototype, 'itemCount', {
+  get: function () { return this[LRU_LIST].length },
+  enumerable: true
+})
+
+LRUCache.prototype.rforEach = function (fn, thisp) {
+  thisp = thisp || this
+  for (var walker = this[LRU_LIST].tail; walker !== null;) {
+    var prev = walker.prev
+    forEachStep(this, fn, walker, thisp)
+    walker = prev
+  }
+}
+
+function forEachStep (self, fn, node, thisp) {
+  var hit = node.value
+  if (isStale(self, hit)) {
+    del(self, node)
+    if (!self[ALLOW_STALE]) {
+      hit = undefined
+    }
+  }
+  if (hit) {
+    fn.call(thisp, hit.value, hit.key, self)
+  }
+}
+
+LRUCache.prototype.forEach = function (fn, thisp) {
+  thisp = thisp || this
+  for (var walker = this[LRU_LIST].head; walker !== null;) {
+    var next = walker.next
+    forEachStep(this, fn, walker, thisp)
+    walker = next
+  }
+}
+
+LRUCache.prototype.keys = function () {
+  return this[LRU_LIST].toArray().map(function (k) {
+    return k.key
+  }, this)
+}
+
+LRUCache.prototype.values = function () {
+  return this[LRU_LIST].toArray().map(function (k) {
+    return k.value
+  }, this)
+}
+
+LRUCache.prototype.reset = function () {
+  if (this[DISPOSE] &&
+      this[LRU_LIST] &&
+      this[LRU_LIST].length) {
+    this[LRU_LIST].forEach(function (hit) {
+      this[DISPOSE](hit.key, hit.value)
+    }, this)
+  }
+
+  this[CACHE] = new Map() // hash of items by key
+  this[LRU_LIST] = new Yallist() // list of items in order of use recency
+  this[LENGTH] = 0 // length of items in the list
+}
+
+LRUCache.prototype.dump = function () {
+  return this[LRU_LIST].map(function (hit) {
+    if (!isStale(this, hit)) {
+      return {
+        k: hit.key,
+        v: hit.value,
+        e: hit.now + (hit.maxAge || 0)
+      }
+    }
+  }, this).toArray().filter(function (h) {
+    return h
+  })
+}
+
+LRUCache.prototype.dumpLru = function () {
+  return this[LRU_LIST]
+}
+
+/* istanbul ignore next */
+LRUCache.prototype.inspect = function (n, opts) {
+  var str = 'LRUCache {'
+  var extras = false
+
+  var as = this[ALLOW_STALE]
+  if (as) {
+    str += '\n  allowStale: true'
+    extras = true
+  }
+
+  var max = this[MAX]
+  if (max && max !== Infinity) {
+    if (extras) {
+      str += ','
+    }
+    str += '\n  max: ' + util.inspect(max, opts)
+    extras = true
+  }
+
+  var maxAge = this[MAX_AGE]
+  if (maxAge) {
+    if (extras) {
+      str += ','
+    }
+    str += '\n  maxAge: ' + util.inspect(maxAge, opts)
+    extras = true
+  }
+
+  var lc = this[LENGTH_CALCULATOR]
+  if (lc && lc !== naiveLength) {
+    if (extras) {
+      str += ','
+    }
+    str += '\n  length: ' + util.inspect(this[LENGTH], opts)
+    extras = true
+  }
+
+  var didFirst = false
+  this[LRU_LIST].forEach(function (item) {
+    if (didFirst) {
+      str += ',\n  '
+    } else {
+      if (extras) {
+        str += ',\n'
+      }
+      didFirst = true
+      str += '\n  '
+    }
+    var key = util.inspect(item.key).split('\n').join('\n  ')
+    var val = { value: item.value }
+    if (item.maxAge !== maxAge) {
+      val.maxAge = item.maxAge
+    }
+    if (lc !== naiveLength) {
+      val.length = item.length
+    }
+    if (isStale(this, item)) {
+      val.stale = true
+    }
+
+    val = util.inspect(val, opts).split('\n').join('\n  ')
+    str += key + ' => ' + val
+  })
+
+  if (didFirst || extras) {
+    str += '\n'
+  }
+  str += '}'
+
+  return str
+}
+
+LRUCache.prototype.set = function (key, value, maxAge) {
+  maxAge = maxAge || this[MAX_AGE]
+
+  var now = maxAge ? Date.now() : 0
+  var len = this[LENGTH_CALCULATOR](value, key)
+
+  if (this[CACHE].has(key)) {
+    if (len > this[MAX]) {
+      del(this, this[CACHE].get(key))
+      return false
+    }
+
+    var node = this[CACHE].get(key)
+    var item = node.value
+
+    // dispose of the old one before overwriting
+    // split out into 2 ifs for better coverage tracking
+    if (this[DISPOSE]) {
+      if (!this[NO_DISPOSE_ON_SET]) {
+        this[DISPOSE](key, item.value)
+      }
+    }
+
+    item.now = now
+    item.maxAge = maxAge
+    item.value = value
+    this[LENGTH] += len - item.length
+    item.length = len
+    this.get(key)
+    trim(this)
+    return true
+  }
+
+  var hit = new Entry(key, value, len, now, maxAge)
+
+  // oversized objects fall out of cache automatically.
+  if (hit.length > this[MAX]) {
+    if (this[DISPOSE]) {
+      this[DISPOSE](key, value)
+    }
+    return false
+  }
+
+  this[LENGTH] += hit.length
+  this[LRU_LIST].unshift(hit)
+  this[CACHE].set(key, this[LRU_LIST].head)
+  trim(this)
+  return true
+}
+
+LRUCache.prototype.has = function (key) {
+  if (!this[CACHE].has(key)) return false
+  var hit = this[CACHE].get(key).value
+  if (isStale(this, hit)) {
+    return false
+  }
+  return true
+}
+
+LRUCache.prototype.get = function (key) {
+  return get(this, key, true)
+}
+
+LRUCache.prototype.peek = function (key) {
+  return get(this, key, false)
+}
+
+LRUCache.prototype.pop = function () {
+  var node = this[LRU_LIST].tail
+  if (!node) return null
+  del(this, node)
+  return node.value
+}
+
+LRUCache.prototype.del = function (key) {
+  del(this, this[CACHE].get(key))
+}
+
+LRUCache.prototype.load = function (arr) {
+  // reset the cache
+  this.reset()
+
+  var now = Date.now()
+  // A previous serialized cache has the most recent items first
+  for (var l = arr.length - 1; l >= 0; l--) {
+    var hit = arr[l]
+    var expiresAt = hit.e || 0
+    if (expiresAt === 0) {
+      // the item was created without expiration in a non aged cache
+      this.set(hit.k, hit.v)
+    } else {
+      var maxAge = expiresAt - now
+      // dont add already expired items
+      if (maxAge > 0) {
+        this.set(hit.k, hit.v, maxAge)
+      }
+    }
+  }
+}
+
+LRUCache.prototype.prune = function () {
+  var self = this
+  this[CACHE].forEach(function (value, key) {
+    get(self, key, false)
+  })
+}
+
+function get (self, key, doUse) {
+  var node = self[CACHE].get(key)
+  if (node) {
+    var hit = node.value
+    if (isStale(self, hit)) {
+      del(self, node)
+      if (!self[ALLOW_STALE]) hit = undefined
+    } else {
+      if (doUse) {
+        self[LRU_LIST].unshiftNode(node)
+      }
+    }
+    if (hit) hit = hit.value
+  }
+  return hit
+}
+
+function isStale (self, hit) {
+  if (!hit || (!hit.maxAge && !self[MAX_AGE])) {
+    return false
+  }
+  var stale = false
+  var diff = Date.now() - hit.now
+  if (hit.maxAge) {
+    stale = diff > hit.maxAge
+  } else {
+    stale = self[MAX_AGE] && (diff > self[MAX_AGE])
+  }
+  return stale
+}
+
+function trim (self) {
+  if (self[LENGTH] > self[MAX]) {
+    for (var walker = self[LRU_LIST].tail;
+      self[LENGTH] > self[MAX] && walker !== null;) {
+      // We know that we're about to delete this one, and also
+      // what the next least recently used key will be, so just
+      // go ahead and set it now.
+      var prev = walker.prev
+      del(self, walker)
+      walker = prev
+    }
+  }
+}
+
+function del (self, node) {
+  if (node) {
+    var hit = node.value
+    if (self[DISPOSE]) {
+      self[DISPOSE](hit.key, hit.value)
+    }
+    self[LENGTH] -= hit.length
+    self[CACHE].delete(hit.key)
+    self[LRU_LIST].removeNode(node)
+  }
+}
+
+// classy, since V8 prefers predictable objects.
+function Entry (key, value, length, now, maxAge) {
+  this.key = key
+  this.value = value
+  this.length = length
+  this.now = now
+  this.maxAge = maxAge || 0
+}