(function() {

  "use strict";

  var WORD = /[\w$]+/g, RANGE = 500;

  CodeMirror.registerHelper("hint", "anyword", function(editor, options) {

    var word = options && options.word || WORD;

    var range = options && options.range || RANGE;

    var cur = editor.getCursor(), curLine = editor.getLine(cur.line);

    var start = cur.ch, end = start;

    while (end < curLine.length && word.test(curLine.charAt(end))) ++end;

    while (start && word.test(curLine.charAt(start - 1))) --start;

    var curWord = start != end && curLine.slice(start, end);

    var list = [], seen = {};

    function scan(dir) {

      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;

        word.lastIndex = 0;

        while (m = word.exec(text)) {

          if ((!curWord || m[0].indexOf(curWord) == 0) && !seen.hasOwnProperty(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)};

  });

})();