object IAstVisitor.Visit(SwitchParameter switchParameter)
{
return Visit(switchParameter);
}
protected virtual object Visit(SwitchParameter switchParameter)
{
return switchParameter.Value.Visit(this);
}
protected virtual AstNode GetAstNode(IEnumerator<Token> enumerator)
{
AstNode ret;
switch (enumerator.Current.Type)
{
case TokenType.ParameterName:
ret = new ParameterName(enumerator.Current,
enumerator.Current.Value);
enumerator.MoveNext();
break;
case TokenType.SwitchParameter:
Token token = enumerator.Current;
enumerator.MoveNext();
ret = new SwitchParameter(token,
token.Value,
this.GetAstNode(enumerator));
break;
case TokenType.NumericValue:
ret = new LiteralValue(
enumerator.Current,
LiteralValueType.Numeric,
enumerator.Current.Value);
enumerator.MoveNext();
break;
case TokenType.StringValue:
ret = new LiteralValue(
enumerator.Current,
LiteralValueType.String,
enumerator.Current.Value);
enumerator.MoveNext();
break;
case TokenType.BoolValue:
ret = new LiteralValue(
enumerator.Current,
LiteralValueType.Boolean,
enumerator.Current.Value);
enumerator.MoveNext();
break;
case TokenType.NullValue:
ret = new LiteralValue(
enumerator.Current,
LiteralValueType.Null,
enumerator.Current.Value);
enumerator.MoveNext();
break;
case TokenType.ListStart:
ret = this.GetSequence(enumerator);
break;
case TokenType.DictionaryStart:
ret = this.GetAssocArray(enumerator);
break;
//case TokenType.DictionaryValueSeperator:
//case TokenType.DictionaryKeySeperator:
case TokenType.DictionaryEnd:
//case TokenType.ListValueSeperator:
case TokenType.ListEnd:
throw new Exception("Invalid token sequence.");
default:
throw new ArgumentOutOfRangeException();
}
if (enumerator.Current.Type == TokenType.ListValueSeperator)
{
enumerator.MoveNext();
AstNode obj = this.GetAstNode(enumerator);
if (obj is Sequence)
{
var list = new List<AstNode>(((Sequence) obj).Elements);
list.Add(ret);
ret = new Sequence(ret.SourceInfo, list);
}
else
{
ret = new Sequence(ret.SourceInfo, new[] {ret, obj});
}
}
return ret;
}
