public Node IfStatement()
{
var ifNode = new If_Statement()
{
AnchorToken = Expect(TokenCategory.IF)
};
ifNode.Add(Expression());
Expect(TokenCategory.THEN);
var stmtList = new Statement_List();
while (firstOfStatement.Contains(CurrentToken))
{
stmtList.Add(Statement());
}
ifNode.Add(stmtList);
while (CurrentToken == TokenCategory.ELSEIF)
{
var elseIfNode = new ElseIf_Statement()
{
AnchorToken = Expect(TokenCategory.ELSEIF)
};
elseIfNode.Add(Expression());
Expect(TokenCategory.THEN);
var stmtListElseIf = new Statement_List();
while (firstOfStatement.Contains(CurrentToken))
{
stmtListElseIf.Add(Statement());
}
elseIfNode.Add(stmtListElseIf);
ifNode.Add(elseIfNode);
}
while (CurrentToken == TokenCategory.ELSE)
{
var elseNode = new Else_Statement()
{
AnchorToken = Expect(TokenCategory.ELSE)
};
var stmtListElse = new Statement_List();
while (firstOfStatement.Contains(CurrentToken))
{
stmtListElse.Add(Statement());
}
elseNode.Add(stmtListElse);
ifNode.Add(elseNode);
}
Expect(TokenCategory.END);
Expect(TokenCategory.EOL);
return(ifNode);
}
public Node ElseStatement()
{
var else_node = new Else_Statement()
{
AnchorToken = Expect(TokenCategory.ELSE)
};
else_node.Add(ZeroOrMore(firstOfStatement, Statement));
return else_node;
}
