feat(full-text-search): implement extended fuzzy (#47)

* refactor classes FuzzySearch and WildcardSearch to functions

Author: Viatorus

packages/full-text-search/spec/generic/search/fuzzy.spec.ts

@@ -120,4 +120,21 @@ describe("fuzzy query", () => {
     let query = new QB().fuzzy("body", "weber").prefixLength(1).fuzziness(2).build();
     assertMatches(fts, query, [6, 8, 9, 10, 11, 12, 13, 14]);
   });
+
+  it("Fuzzy query extended.", () => {
+    let docs = ["walker", "wbr", "we", "web", "webe", "weber", "webere", "webree", "weberei", "wbes", "wbert", "wbb",
+      "xeb", "wrr"];
+    let fts = new FullTextSearch([{name: "body"}]);
+    for (let i = 0; i < docs.length; i++) {
+      fts.addDocument({
+        $loki: i,
+        body: docs[i]
+      });
+    }
+    let query = new QB().fuzzy("body", "web").prefixLength(1).fuzziness(1).extended(true).build();
+    assertMatches(fts, query, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]);
+
+    query = new QB().match("body", "web").prefixLength(1).fuzziness(1).extended(true).build();
+    assertMatches(fts, query, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]);
+  });
 });