private static AstNode ParseIf(TokenStream stream)
{
IfStatement ifStmt = new IfStatement (stream.Location);
stream.Expect (TokenClass.Keyword, "if");
stream.Expect (TokenClass.OpenParan);
ifStmt.Add (ParseExpression (stream));
stream.Expect (TokenClass.CloseParan);
ifStmt.Add (ParseStatement (stream));
if (stream.Accept (TokenClass.Keyword, "else")) {
ifStmt.Add (ParseStatement (stream));
} else {
ifStmt.Add (new CodeBlock (stream.Location));
}
return ifStmt;
}
public void Accept(IfStatement ifStmt)
{
ifStmt.Visit (functionCompiler);
}
public override void Accept (IfStatement ifStmt)
{
IodineLabel elseLabel = methodBuilder.CreateLabel ();
IodineLabel endLabel = methodBuilder.CreateLabel ();
ifStmt.Condition.Visit (this);
methodBuilder.EmitInstruction (ifStmt.Body.Location, Opcode.JumpIfFalse, elseLabel);
ifStmt.Body.Visit (this);
methodBuilder.EmitInstruction (ifStmt.ElseBody.Location, Opcode.Jump, endLabel);
methodBuilder.MarkLabelPosition (elseLabel);
ifStmt.ElseBody.Visit (this);
methodBuilder.MarkLabelPosition (endLabel);
}
public override void Accept (IfStatement ifStmt)
{
errorLog.AddError (ErrorType.ParserError, ifStmt.Location,
"statement can not exist inside pattern!");
}
public virtual void Accept(IfStatement ifStmt)
{
}
public void Accept(IfStatement ifStmt)
{
ifStmt.VisitChildren (this);
}
public void Accept(IfStatement ifStmt)
{
errorLog.AddError (ErrorType.ParserError, ifStmt.Location,
"Statement not allowed outside function body!");
}
public void Accept(IfStatement ifStmt)
{
}