private BaseBlock ToExpression(Type entityType, DataType returnDataType)
{
String text = _sb.ToString();
if (this._fnArgs == null)
{
if (PropertySignature.IsProperty(entityType, text))
{
// TODO: we could check that the PropBlock dataType is compatible with the returnDataType
return(new PropBlock(text, entityType));
}
else
{
return(new LitBlock(text, returnDataType));
}
}
else
{
String fnName = text;
var argTypes = FnBlock.GetArgTypes(fnName);
if (argTypes.Count != _fnArgs.Count)
{
throw new Exception("Incorrect number of arguments to '" + fnName
+ "' function; was expecting " + argTypes.Count);
}
var exprs = _fnArgs.Select((token, ix) => token.ToExpression(entityType, argTypes[ix])).ToList();
// TODO: we could check that the FnBlock dataType is compatible with the returnDataType
return(new FnBlock(text, exprs));
}
}
// will return either a PropBlock or a FnBlock
public static BaseBlock CreateLHSBlock(Object exprSource,
Type entityType)
{
if (exprSource == null)
{
throw new Exception(
"Null expressions are only permitted on the right hand side of a BinaryPredicate");
}
if (exprSource is IDictionary)
{
throw new Exception(
"Object expressions are only permitted on the right hand side of a BinaryPredicate");
}
if (exprSource is IList)
{
throw new Exception(
"Array expressions are only permitted on the right hand side of a BinaryPredicate");
}
if (!(exprSource is String))
{
throw new Exception(
"Only string expressions are permitted on this predicate");
}
String source = (String)exprSource;
if (source.IndexOf("(") == -1)
{
return(new PropBlock(source, entityType));
}
else
{
return(FnBlock.CreateFrom(source, entityType));
}
}