public IfNode(List <IfCase> ifCases, ElseCase elseCase)
{
IfCases = ifCases;
ElseCase = elseCase;
}
private ParseResult IfExpr()
{
List <IfCase> cases = new List <IfCase>();
ElseCase elseCase = null;
var start = current_token.Pos_Start.Copy();
Advance();
var conditionResult = Expr();
if (conditionResult.HasError())
{
return(conditionResult);
}
if (!current_token.Equals(new Token(TokenType.KEYWORD, "then")))
{
return(new InvalidSyntaxError("Expected 'then'", current_token.Pos_Start, current_token.Pos_End));
}
Advance();
var ifResult = Expr();
if (ifResult.HasError())
{
return(ifResult);
}
cases.Add(new IfCase(conditionResult.Node, ifResult.Node));
while (current_token.Equals(new Token(TokenType.KEYWORD, "elif")))
{
Advance();
var elifConditionResult = Expr();
if (elifConditionResult.HasError())
{
return(elifConditionResult);
}
if (!current_token.Equals(new Token(TokenType.KEYWORD, "then")))
{
return(new InvalidSyntaxError("Expected 'then'", current_token.Pos_Start, current_token.Pos_End));
}
Advance();
var elifResult = Expr();
if (elifResult.HasError())
{
return(elifResult);
}
cases.Add(new IfCase(elifConditionResult.Node, elifResult.Node));
}
if ((current_token.Equals(new Token(TokenType.KEYWORD, "else"))))
{
Advance();
var elseResult = Expr();
if (elseResult.HasError())
{
return(elseResult);
}
elseCase = new ElseCase(elseResult.Node);
}
return(new IfNode(cases, elseCase).SetPos(start, elseCase?.Expr.Pos_End ?? cases[cases.Count - 1].Expr.Pos_End));
}
