Revert PrefetchAndCache

1 files changed, 0 insertions, 108 deletions

diff --git a/src/background/completion/impl/PrefetchAndCache.ts b/src/background/completion/impl/PrefetchAndCache.ts
deleted file mode 100644
index d2889b0..0000000
--- a/src/background/completion/impl/PrefetchAndCache.ts
+++ /dev/null
@@ -1,108 +0,0 @@
-type Getter<T> = (query: string) => Promise<T[]>;
-type Filter<T> = (src: T[], query: string) => T[];
-
-const WHITESPACE = /\s/;
-
-// `shortKey` returns a shorten key to pre-fetch completions and store in the
-// cache.  The shorten key is generated by the following rules:
-//
-// 1. If the query contains a space in the middle: i.e. the query consists of
-//    multiple words, the method removes the last word from the query, and
-//    returns joined remaining words with space.
-//
-// 2. If the query is a single word and it's an URL, the method returns a new
-//    URL excluding search query with the upper path of the original URL.
-//
-// 3. If the query is a single word and it's not an URL, the method returns a
-//    word with the half-length of the original query.
-//
-//  Examples:
-//
-//    shortKey("hello world good bye")
-//    => "hello world good"
-//
-//    shortKey("https://example.com/path/to/resource?q=hello")
-//    => "https://example.com/path/to/"
-//
-//    shortKey("the-query-with-super-long-word")
-//    => "the-query-with-"
-//
-export const shortKey = (query: string): string => {
-  if (WHITESPACE.test(query)) {
-    return query
-      .split(WHITESPACE)
-      .filter((word) => word.length > 0)
-      .slice(0, -1)
-      .join(" ");
-  }
-  let url;
-  try {
-    url = new URL(query);
-  } catch (e) {
-    return query.slice(0, query.length / 2);
-  }
-
-  if (url.origin === query) {
-    // may be on typing or removing URLs such as "such as https://goog"
-    return query.slice(0, query.length / 2);
-  }
-  if (url.pathname.endsWith("/")) {
-    // remove parameters and move to upper path
-    return new URL("..", url).href;
-  }
-  // remove parameters
-  return new URL(".", url).href;
-};
-
-export default class PrefetchAndCache<T> {
-  private shortKey: string | undefined;
-
-  private shortKeyCache: T[] = [];
-
-  constructor(
-    private getter: Getter<T>,
-    private filter: Filter<T>,
-    private prefetchThrethold: number = 1
-  ) {}
-
-  async get(query: string): Promise<T[]> {
-    query = query.trim();
-    if (query.length < this.prefetchThrethold) {
-      this.shortKey = undefined;
-      return this.getter(query);
-    }
-
-    if (this.needToRefresh(query)) {
-      this.shortKey = shortKey(query);
-      this.shortKeyCache = await this.getter(this.shortKey);
-    }
-    return this.filter(this.shortKeyCache, query);
-  }
-
-  private needToRefresh(query: string): boolean {
-    if (!this.shortKey) {
-      // no cache
-      return true;
-    }
-
-    if (query.length < this.shortKey.length) {
-      // query: "hello"
-      // cache: "hello_world"
-      return true;
-    }
-
-    if (!query.startsWith(this.shortKey)) {
-      // queyr:   "hello_w"
-      // shorten: "hello_morning"
-      return true;
-    }
-
-    if (query.slice(this.shortKey.length).includes(" ")) {
-      // queyr:   "hello x"
-      // shorten: "hello"
-      return true;
-    }
-
-    return false;
-  }
-}