private static AstNode ParseTernaryIfElse(TokenStream stream)
{
AstNode expr = ParsePipeline (stream);
while (stream.Accept (TokenClass.Keyword, "when")) {
AstNode condition = ParseExpression (stream);
stream.Expect (TokenClass.Keyword, "else");
AstNode altValue = ParseTernaryIfElse (stream);
expr = new TernaryExpression (expr.Location, condition, expr, altValue);
}
return expr;
}
public override void Accept (TernaryExpression ifExpr)
{
IodineLabel elseLabel = methodBuilder.CreateLabel ();
IodineLabel endLabel = methodBuilder.CreateLabel ();
ifExpr.Condition.Visit (this);
methodBuilder.EmitInstruction (ifExpr.Expression.Location, Opcode.JumpIfFalse, elseLabel);
ifExpr.Expression.Visit (this);
methodBuilder.EmitInstruction (ifExpr.ElseExpression.Location, Opcode.Jump, endLabel);
methodBuilder.MarkLabelPosition (elseLabel);
ifExpr.ElseExpression.Visit (this);
methodBuilder.MarkLabelPosition (endLabel);
}
public void Accept(TernaryExpression ifExpr)
{
ifExpr.Visit (functionCompiler);
}
public override void Accept (TernaryExpression ifExpr)
{
errorLog.AddError (ErrorType.ParserError, ifExpr.Location,
"Expression can not exist inside pattern!");
}
public virtual void Accept(TernaryExpression ifExpr)
{
}
public void Accept(TernaryExpression ifExpr)
{
ifExpr.VisitChildren (this);
}