[anyword-hint addon] Optimize

Issue #2109

addon/hint/anyword-hint.js

@@ -13,22 +13,20 @@
     var curWord = start != end && curLine.slice(start, end);
 
     var list = [], seen = {};
-    function scan(dir) {
+    var re = new RegExp(word.source, "g");
+    for (var dir = -1; dir <= 1; dir += 2) {
       var line = cur.line, end = Math.min(Math.max(line + dir * range, editor.firstLine()), editor.lastLine()) + dir;
       for (; line != end; line += dir) {
         var text = editor.getLine(line), m;
-        var re = new RegExp(word.source, "g");
         while (m = re.exec(text)) {
           if (line == cur.line && m[0] === curWord) continue;
-          if ((!curWord || m[0].indexOf(curWord) == 0) && !seen.hasOwnProperty(m[0])) {
+          if ((!curWord || m[0].indexOf(curWord) == 0) && !Object.prototype.hasOwnProperty.call(seen, m[0])) {
             seen[m[0]] = true;
             list.push(m[0]);
           }
         }
       }
     }
-    scan(-1);
-    scan(1);
     return {list: list, from: CodeMirror.Pos(cur.line, start), to: CodeMirror.Pos(cur.line, end)};
   });
 })();