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* Copyright (c) Nicolas Gallagher.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * \n */\nvar dataUriPattern = /^data:/;\n\nvar ImageUriCache =\n/*#__PURE__*/\nfunction () {\n  function ImageUriCache() {}\n\n  ImageUriCache.has = function has(uri) {\n    var entries = ImageUriCache._entries;\n    var isDataUri = dataUriPattern.test(uri);\n    return isDataUri || Boolean(entries[uri]);\n  };\n\n  ImageUriCache.add = function add(uri) {\n    var entries = ImageUriCache._entries;\n    var lastUsedTimestamp = Date.now();\n\n    if (entries[uri]) {\n      entries[uri].lastUsedTimestamp = lastUsedTimestamp;\n      entries[uri].refCount += 1;\n    } else {\n      entries[uri] = {\n        lastUsedTimestamp: lastUsedTimestamp,\n        refCount: 1\n      };\n    }\n  };\n\n  ImageUriCache.remove = function remove(uri) {\n    var entries = ImageUriCache._entries;\n\n    if (entries[uri]) {\n      entries[uri].refCount -= 1;\n    } // Free up entries when the cache is \"full\"\n\n\n    ImageUriCache._cleanUpIfNeeded();\n  };\n\n  ImageUriCache._cleanUpIfNeeded = function _cleanUpIfNeeded() {\n    var entries = ImageUriCache._entries;\n    var imageUris = Object.keys(entries);\n\n    if (imageUris.length + 1 > ImageUriCache._maximumEntries) {\n      var leastRecentlyUsedKey;\n      var leastRecentlyUsedEntry;\n      imageUris.forEach(function (uri) {\n        var entry = entries[uri];\n\n        if ((!leastRecentlyUsedEntry || entry.lastUsedTimestamp < leastRecentlyUsedEntry.lastUsedTimestamp) && entry.refCount === 0) {\n          leastRecentlyUsedKey = uri;\n          leastRecentlyUsedEntry = entry;\n        }\n      });\n\n      if (leastRecentlyUsedKey) {\n        delete entries[leastRecentlyUsedKey];\n      }\n    }\n  };\n\n  return ImageUriCache;\n}();\n\nImageUriCache._maximumEntries = 256;\nImageUriCache._entries = {};\nexport { ImageUriCache as default };"]},"metadata":{},"sourceType":"script"}