///////////////////////
// Private
private void VerifyFieldsPresent(HqlFunction func)
{
if (func.HasScalar)
{
HqlField field = func.Field;
VerifyFieldsPresent(field);
}
}
public HqlField(HqlFieldType type, HqlFunction func) // for FUNCTION
{
if (type != HqlFieldType.FUNCTION)
{
throw new Exception("Instance is for FUNCTION only");
}
Init(type);
_func = func;
}
public bool Equals(HqlFunction func)
{
if (FuncType != func.FuncType)
{
return(false);
}
if (!Field.Equals(func.Field))
{
return(false);
}
if (!(_options == null && func._options == null) && !_options.Equals(func._options))
{
return(false);
}
return(true);
}
private bool MoveNextTokenCheckFunction()
{
if (_token.WordType == HqlWordType.KEYWORD && _token.Keyword == HqlKeyword.FUNCTION && MatchNext("("))
{
HqlFunction func = null;
HqlToken funcName = _token;
MoveNextToken();
HqlToken paren = _token;
if (paren.WordType != HqlWordType.KEYWORD || paren.Keyword != HqlKeyword.OPENPAREN)
{
throw new Exception("Expected an open-paren in function declaration.");
}
MoveNextToken();
HqlToken next = _token;
if (next.WordType == HqlWordType.FIELD)
{
if (next.Field.HasFunction)
{
throw new Exception("Cannot have nested functions");
}
func = new HqlFunction(HqlFunction.ResolveFunctionType(funcName.Data), next.Field);
next = new HqlToken(HqlWordType.FIELD, new HqlField(HqlFieldType.FUNCTION, func));
}
else if (next.WordType == HqlWordType.KEYWORD && next.Keyword == HqlKeyword.STAR)
{
HqlField star = new HqlField(HqlFieldType.STAR);
func = new HqlFunction(HqlFunction.ResolveFunctionType(funcName.Data), star);
next = new HqlToken(HqlWordType.FIELD, new HqlField(HqlFieldType.FUNCTION, func));
}
else if (next.WordType == HqlWordType.SCALAR)
{
func = new HqlFunction(HqlFunction.ResolveFunctionType(funcName.Data), next.Field);
next = new HqlToken(HqlWordType.FIELD, new HqlField(HqlFieldType.FUNCTION, func));
}
else if (next.WordType == HqlWordType.INT || next.WordType == HqlWordType.FLOAT)
{
func = new HqlFunction(HqlFunction.ResolveFunctionType(funcName.Data), HqlField.CreateObject(next));
next = new HqlToken(HqlWordType.FIELD, new HqlField(HqlFieldType.FUNCTION, func));
}
else
{
throw new Exception("Expected a valid field instead of this unknown object");
}
MoveNextToken();
HqlToken lookForComma = _token;
while (lookForComma.WordType == HqlWordType.KEYWORD && lookForComma.Keyword == HqlKeyword.COMMA)
{
MoveNextToken();
HqlToken option = _token;
func.SetOption(option);
MoveNextToken();
lookForComma = _token;
}
HqlToken closedparen = _token;
if (closedparen.WordType != HqlWordType.KEYWORD || closedparen.Keyword != HqlKeyword.CLOSEDPAREN)
{
throw new Exception("Expected an close-paren in function declaration.");
}
_token = next;
return(true);
}
return(false);
}
