private static AstNode ParseGiven(TokenStream stream)
{
GivenStatement switchStmt = new GivenStatement (stream.Location);
stream.Expect (TokenClass.Keyword, "given");
stream.Expect (TokenClass.OpenParan);
switchStmt.Add (ParseExpression (stream));
stream.Expect (TokenClass.CloseParan);
stream.Expect (TokenClass.OpenBrace);
AstNode defaultBlock = new AstRoot (stream.Location);
AstRoot caseStatements = new AstRoot (stream.Location);
while (!stream.EndOfStream && !stream.Match (TokenClass.CloseBrace)) {
caseStatements.Add (ParseWhen (stream));
if (stream.Accept (TokenClass.Keyword, "default")) {
defaultBlock = ParseStatement (stream);
}
}
switchStmt.Add (caseStatements);
switchStmt.Add (defaultBlock);
stream.Expect (TokenClass.CloseBrace);
return switchStmt;
}
public override void Accept (GivenStatement switchStmt)
{
foreach (AstNode node in switchStmt.WhenStatements.Children) {
WhenStatement caseStmt = node as WhenStatement;
caseStmt.Values.Visit (this);
caseStmt.Body.Visit (this);
}
switchStmt.GivenValue.Visit (this);
methodBuilder.EmitInstruction (switchStmt.Location, Opcode.SwitchLookup, switchStmt.WhenStatements.Children.Count);
IodineLabel endLabel = methodBuilder.CreateLabel ();
methodBuilder.EmitInstruction (switchStmt.Location, Opcode.JumpIfTrue, endLabel);
switchStmt.DefaultStatement.Visit (this);
methodBuilder.MarkLabelPosition (endLabel);
}
public void Accept(GivenStatement switchStmt)
{
}
public override void Accept (GivenStatement switchStmt)
{
errorLog.AddError (ErrorType.ParserError, switchStmt.Location,
"statement can not exist inside pattern!");
}
public void Accept(GivenStatement switchStmt)
{
switchStmt.VisitChildren (this);
}
public void Accept(GivenStatement switchStmt)
{
errorLog.AddError (ErrorType.ParserError, switchStmt.Location,
"Statement not allowed outside function body!");
}
