code: function _getExclusionList(editor, constPos) {
          var ctxPrev, ctxNext, exclusionList = [], pos, braceParity;
  
          // Move back to find exclusions.
          pos = $.extend({}, constPos);
          braceParity = 1;
          ctxPrev = TokenUtils.getInitialContext(editor._codeMirror, pos);
          while (TokenUtils.moveSkippingWhitespace(TokenUtils.movePrevToken, ctxPrev)) {
              if (ctxPrev.token.type === null) {
                  if (ctxPrev.token.string === "}") {
                      braceParity++;
                  } else if (ctxPrev.token.string === "{") {
                      braceParity--;
                  }
              }
  
              if (braceParity === 1 && ctxPrev.token.type === "string property") {
                  exclusionList.push(stripQuotes(ctxPrev.token.string));
              } else if (braceParity === 0) {
                  break;
              }
          }
  
          // Move forward and find exclusions.
          pos = $.extend({}, constPos);
          braceParity = 1;
          ctxNext = TokenUtils.getInitialContext(editor._codeMirror, pos);
          while (TokenUtils.moveSkippingWhitespace(TokenUtils.moveNextToken, ctxNext)) {
              if (ctxNext.token.type === null) {
                  if (ctxNext.token.string === "{") {
                      braceParity++;
                  } else if (ctxNext.token.string === "}") {
                      braceParity--;
                  }
              }
  
              if (braceParity === 1 && ctxNext.token.type === "string property") {
                  exclusionList.push(stripQuotes(ctxNext.token.string));
              } else if (braceParity === 0) {
                  break;
              }
          }
  
          return exclusionList;
      }
docs: @private
  
  Returns a list of properties that are already used by an object
  
  @param {!Editor} editor
  @param {!{line: number, ch: number}} constPos
  @return {Array.<String>}