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 LitBlock
public static BaseBlock CreateRHSBlock(object exprSource,
Type entityType, DataType otherExprDataType)
{
if (exprSource == null)
{
return(new LitBlock(exprSource, otherExprDataType));
}
if (exprSource is string)
{
var source = (string)exprSource;
if (entityType == null)
{
// if entityType is unknown then assume that the rhs is a
// literal
return(new LitBlock(source, otherExprDataType));
}
if (PropertySignature.IsProperty(entityType, source))
{
return(new PropBlock(source, entityType));
}
else
{
return(new LitBlock(source, otherExprDataType));
}
}
if (TypeFns.IsPredefinedType(exprSource.GetType()))
{
return(new LitBlock(exprSource, otherExprDataType));
}
if (exprSource is IDictionary <string, object> )
{
var exprMap = (IDictionary <string, object>)exprSource;
// note that this is NOT the same a using get and checking for null
// because null is a valid 'value'.
if (!exprMap.ContainsKey("value"))
{
throw new Exception(
"Unable to locate a 'value' property on: "
+ exprMap.ToString());
}
var value = exprMap["value"];
if (exprMap.ContainsKey("isProperty"))
{
return(new PropBlock((string)value, entityType));
}
else
{
var dt = (string)exprMap["dataType"];
var dataType = (dt != null) ? DataType.FromName(dt) : otherExprDataType;
return(new LitBlock(value, dataType));
}
}
if (exprSource is IList)
{
// right now this pretty much implies the values on an 'in' clause
return(new LitBlock(exprSource, otherExprDataType));
}
if (TypeFns.IsEnumType(exprSource.GetType()))
{
return(new LitBlock(exprSource, otherExprDataType));
}
throw new Exception(
"Unable to parse the right hand side of this BinaryExpression: "
+ exprSource.ToString());
}