public virtual Statement VisitYield(Yield Yield)
{
if (Yield == null) return null;
Yield.Expression = this.VisitExpression(Yield.Expression);
return Yield;
}
public override Statement VisitYield(Yield Yield)
{
if (Yield == null) return null;
return base.VisitYield((Yield)Yield.Clone());
}
public override Statement VisitYield(Yield Yield)
{
throw new NotImplementedException("Node type not yet supported");
}
private Statement ParseYield(TokenSet followers, bool preferExpressionToDeclaration){
this.sawReturnOrYield = true;
Yield Yield = new Yield();
Yield.SourceContext = this.scanner.CurrentSourceContext;
ScannerState ss = this.scanner.state;
Debug.Assert(this.currentToken == Token.Yield);
this.GetNextToken();
bool breakOutOfIterator = false;
if (this.currentToken == Token.Break){
this.GetNextToken();
breakOutOfIterator = true;
}else if (this.currentToken != Token.Return){
//Restore prior state and reparse as expression
this.scanner.endPos = Yield.SourceContext.StartPos;
this.scanner.state = ss;
this.currentToken = Token.None;
this.GetNextToken();
return this.ParseExpressionStatementOrDeclaration(false, followers, preferExpressionToDeclaration, true);
}else
this.GetNextToken();
Expression expr = Yield.Expression = breakOutOfIterator ? null : this.ParseExpression(followers|Token.Semicolon);
if (expr != null)
Yield.SourceContext.EndPos = expr.SourceContext.EndPos;
this.SkipSemiColon(followers);
return Yield;
}
public EventingVisitor(Action<Yield> visitYield) { VisitedYield += visitYield; } public event Action<Yield> VisitedYield; public override Statement VisitYield(Yield Yield) { if (VisitedYield != null) VisitedYield(Yield); return base.VisitYield(Yield); }