code: function findFirstNonWhitespaceCharacterAndColumn(startPos, endPos, sourceFile, options) {
                  var character = 0;
                  var column = 0;
                  for (var pos = startPos; pos < endPos; pos++) {
                      var ch = sourceFile.text.charCodeAt(pos);
                      if (!ts.isWhiteSpaceSingleLine(ch)) {
                          break;
                      }
                      if (ch === 9 /* tab */) {
                          column += options.tabSize + (column % options.tabSize);
                      }
                      else {
                          column++;
                      }
                      character++;
                  }
                  return { column: column, character: character };
              }
docs: /*
  Character is the actual index of the character since the beginning of the line.
  Column - position of the character after expanding tabs to spaces
  "0\t2$"
  value of 'character' for '$' is 3
  value of 'column' for '$' is 6 (assuming that tab size is 4)