public static If produce(Queue<Token> tokens)
{
expect(tokens, TokenType.IF);
Expression expression = ExpressionFactory.produce(tokens);
expect(tokens, TokenType.DO);
Block block = BlockFactory.produce(tokens);
if (tokens.Count != 0 && tokens.First().tokenType == TokenType.ELSE)
{
tokens.Dequeue();
Block elseBlock = null;
if (tokens.First().tokenType == TokenType.IF)
{
Token firstBlockToken = tokens.First();
If ifSymbol = produce(tokens);
List<Statement> elseBlockSymbolList = new List<Statement> {ifSymbol};
elseBlock = new Block(firstBlockToken, elseBlockSymbolList);
}
else {
expect(tokens, TokenType.DO);
elseBlock = BlockFactory.produce(tokens);
}
return new If(expression, block, elseBlock);
}
return new If(expression, block);
}
bool visitLeave(Block block)
{
Console.WriteLine("LEAVE - Block");
return true;
}
bool visitEnter(Block block)
{
Console.WriteLine("ENTER - Block");
return true;
}
public While(Expressions.Expression expression, Block block) : base(expression.token)
{
this.expression = expression;
this.block = block;
}
public If(Expressions.Expression expression, Block block, Block elseBlock) : base(expression.token)
{
this.expression = expression;
this.block = block;
this.elseBlock = elseBlock;
}
public bool visitLeave(Block block)
{
return true;
}
public bool visitEnter(Block block)
{
return true;
}