// <logo-move-command> ::= MOVETO <integer> , <integer>
private BaseLogoCommand ParseLogoMoveToCommand()
{
Match(Token.MOVETO);
Match(Token.NUMBER);
var numberXRecord = new NumberRecord(Token.MOVETO, scanner.ScanBuffer);
Match(Token.COMMA);
Match(Token.NUMBER);
var numberYRecord = new NumberRecord(Token.MOVETO, scanner.ScanBuffer);
return(new LogoPositionCommand(numberXRecord, numberYRecord));
}
// <logo-repeat-command> ::= REPEAT <integer> [ <logo-sentence> { <logo-sentence> } ]
private BaseLogoCommand ParseLogoRepeatCommand()
{
Match(Token.REPEAT);
Match(Token.NUMBER);
var repeatNumberRecord = new NumberRecord(Token.REPEAT, scanner.ScanBuffer);
Match(Token.LBRACKET);
var logoCommands = new Collection <BaseLogoCommand>();
ParseLogoSentences(logoCommands);
Match(Token.RBRACKET);
return(new LogoRepeatCommand(repeatNumberRecord, logoCommands));
}
// <logo-direction-command> ::= FORWARD <integer>
// | BACK <integer>
// | LEFT <integer>
// | RIGHT <integer>
private BaseLogoCommand ParseLogoDirectionCommand(Token nextToken)
{
BaseLogoCommand result;
Match(nextToken);
Match(Token.NUMBER);
var numberRecord = new NumberRecord(nextToken, scanner.ScanBuffer);
if (nextToken == Token.FORWARD || nextToken == Token.BACK)
{
result = new LogoMoveCommand(numberRecord);
}
else
{
result = new LogoTurnCommand(numberRecord);
}
return(result);
}
public LogoTurnCommand(NumberRecord numberRecord)
{
TurnAngle = numberRecord.Number;
}
public LogoMoveCommand(NumberRecord numberRecord)
{
Distance = numberRecord.Number;
}
public LogoRepeatCommand(NumberRecord repeatNumber, IEnumerable <BaseLogoCommand> logoCommands)
{
Repeat = repeatNumber.Number;
commands.AddRange(logoCommands);
}
