pgn method
Return the PGN representation of the game thus far
Implementation
String pgn([Map? options]) {
/* using the specification from http://www.chessclub.com/help/PGN-spec
* example for html usage: .pgn({ max_width: 72, newline_char: "<br />" })
*/
final newline = (options != null && options.containsKey('newline_char') && options['newline_char'] != null) ? options['newline_char'] : '\n';
final max_width = (options != null && options.containsKey('max_width') && options['max_width'] != null) ? options['max_width'] : 0;
final result = [];
var header_exists = false;
/* add the PGN header headerrmation */
for (var i in header.keys) {
/* TODO: order of enumerated properties in header object is not
* guaranteed, see ECMA-262 spec (section 12.6.4)
*/
result.add('[' + i.toString() + ' \"' + header[i].toString() + '\"]' + newline);
header_exists = true;
}
if (header_exists && (history.isNotEmpty)) {
result.add(newline);
}
final moves = san_moves();
if (max_width == 0) {
return result.join('') + moves.join(' ');
}
/* wrap the PGN output at max_width */
var current_width = 0;
for (var i = 0; i < moves.length; i++) {
/* if the current move will push past max_width */
if (current_width + moves[i]!.length > max_width && i != 0) {
/* don't end the line with whitespace */
if (result[result.length - 1] == ' ') {
result.removeLast();
}
result.add(newline);
current_width = 0;
} else if (i != 0) {
result.add(' ');
current_width++;
}
result.add(moves[i]);
current_width += moves[i]!.length;
}
return result.join('');
}