public void Parse(HqlTokenProcessor processor, HqlKeyword firstToken, HqlKeyword thisKeyword, HqlClause select)
{
HqlToken token;
int openParen = 0;
// first thing should be WHERE
token = processor.GetToken();
if (token.WordType != HqlWordType.KEYWORD || token.Keyword != firstToken)
{
return;
}
// now pull back things until you get to EOF or GROUP
processor.MoveNextToken();
for (int i = 0; ; i++)
{
if (!ParseCompare(processor, (i > 0), ref openParen, true, thisKeyword, select))
{
break;
}
}
if (openParen != 0)
{
throw new Exception("Unbalanced parens");
}
}
public void SetPreviousDirection(HqlKeyword direction)
{
if (_fields == null || _fields.Length == 0)
{
throw new Exception("No fields saved to set direction");
}
if (direction != HqlKeyword.DESCENDING && direction != HqlKeyword.ASCENDING)
{
throw new Exception("Direction keyword not given");
}
_fields[_fields.Length - 1].Direction = direction;
}
///////////////////////
// Private
protected bool ParseCompare(HqlTokenProcessor processor, bool andorAllowed, ref int openParen, bool closedAllowed, HqlKeyword thisKeyword, HqlClause select)
{
#if DEBUG
if (thisKeyword != HqlKeyword.WHERE && thisKeyword != HqlKeyword.HAVING && thisKeyword != HqlKeyword.ON)
{
throw new Exception("Cannot access ParseCompare with invalid keyword");
}
#endif
HqlToken token = processor.GetToken();
if (processor.MatchesEndOfProcessing())
{
return(false);
}
if (token.WordType == HqlWordType.KEYWORD && token.Keyword == HqlKeyword.CLOSEDPAREN)
{
if (!closedAllowed)
{
throw new Exception("Empty Parens found");
}
openParen--;
return(false);
}
if (token.WordType == HqlWordType.KEYWORD &&
(
(
thisKeyword == HqlKeyword.ON &&
(
token.Keyword == HqlKeyword.WHERE ||
token.Keyword == HqlKeyword.INNER ||
token.Keyword == HqlKeyword.RIGHT_OUTER ||
token.Keyword == HqlKeyword.LEFT_OUTER ||
token.Keyword == HqlKeyword.FULL_OUTER ||
token.Keyword == HqlKeyword.WHERE ||
token.Keyword == HqlKeyword.GROUPBY ||
token.Keyword == HqlKeyword.HAVING ||
token.Keyword == HqlKeyword.ORDERBY ||
token.Keyword == HqlKeyword.WITH
)
)
||
(
thisKeyword == HqlKeyword.WHERE &&
(
token.Keyword == HqlKeyword.INNER ||
token.Keyword == HqlKeyword.RIGHT_OUTER ||
token.Keyword == HqlKeyword.LEFT_OUTER ||
token.Keyword == HqlKeyword.FULL_OUTER ||
token.Keyword == HqlKeyword.WHERE ||
token.Keyword == HqlKeyword.GROUPBY ||
token.Keyword == HqlKeyword.HAVING ||
token.Keyword == HqlKeyword.ORDERBY ||
token.Keyword == HqlKeyword.WITH
)
)
||
(
thisKeyword == HqlKeyword.HAVING &&
(
token.Keyword == HqlKeyword.ORDERBY ||
token.Keyword == HqlKeyword.WITH
)
)
)
)
{
return(false);
}
if (token.WordType == HqlWordType.KEYWORD && (token.Keyword == HqlKeyword.AND || token.Keyword == HqlKeyword.OR))
{
if (!andorAllowed)
{
throw new Exception("Unexpected AND/OR");
}
_q.Add(token);
processor.MoveNextToken();
return(true);
}
if (token.WordType == HqlWordType.KEYWORD && token.Keyword == HqlKeyword.OPENPAREN)
{
openParen++;
_q.Add(token);
processor.MoveNextToken();
for (int i = 0; ; i++)
{
if (!ParseCompare(processor, (i > 0), ref openParen, (i > 0), thisKeyword, select))
{
break;
}
}
token = processor.GetToken();
if (token.WordType != HqlWordType.KEYWORD || token.Keyword != HqlKeyword.CLOSEDPAREN)
{
throw new Exception(String.Format("Unbalanced Parens in {0}", _name));
}
_q.Add(token);
processor.MoveNextToken();
}
else
{
HqlToken token1 = token;
if (token1.WordType == HqlWordType.UNKNOWN && !processor.CheckForTokenReference(ref token1))
{
throw new Exception(String.Format("Unknown {0} reference to {1}", _name, token1.Data));
}
// HACK - sort of a hack this says if I can't find this field
// then add it to the select but make it not print out
HqlEvaluator.VerifyFieldPresence(select, token1);
// END HACK
processor.MoveNextToken();
HqlToken compare = processor.GetToken();
// this could be
// - a COMPARE such as |field > 0|
// - an IN such as |field in ('A', 'B')|
// - an IN such as |field in (select item from bob)|
if (compare.WordType == HqlWordType.KEYWORD && compare.Keyword == HqlKeyword.COMPARE)
{
processor.MoveNextToken();
HqlToken token2 = processor.GetToken();
if (token2.WordType == HqlWordType.UNKNOWN && !processor.CheckForTokenReference(ref token2))
{
throw new Exception(String.Format("Unknown WHERE reference to {0}", token2.Data));
}
// HACK - sort of a hack this says if I can't find this field
// then add it to the select but make it not print out
HqlEvaluator.VerifyFieldPresence(select, token2);
// END HACK
HqlCompareToken comparetoken = new HqlCompareToken(token1, compare, token2);
_q.Add(comparetoken);
processor.MoveNextToken();
}
else if (compare.WordType == HqlWordType.KEYWORD && (compare.Keyword == HqlKeyword.IN || compare.Keyword == HqlKeyword.NOT_IN))
{
// now need to check for values or select
processor.MoveNextToken();
HqlToken paren = processor.GetToken();
if (paren.WordType != HqlWordType.KEYWORD || paren.Keyword != HqlKeyword.OPENPAREN)
{
throw new Exception(String.Format("Expected an open paren after IN in {0}", _name));
}
ArrayList compareValues = new ArrayList();
bool ExpectedValues = true;
for (int count = 0; ; count++)
{
processor.MoveNextToken();
HqlToken val = processor.GetToken();
if (val.WordType == HqlWordType.KEYWORD && val.Keyword == HqlKeyword.CLOSEDPAREN)
{
break;
}
if (val.WordType == HqlWordType.KEYWORD && val.Keyword == HqlKeyword.COMMA)
{
ExpectedValues = true;
continue;
}
if (val.WordType == HqlWordType.KEYWORD && val.Keyword == HqlKeyword.SELECT)
{
ExpectedValues = false;
if (count != 0)
{
throw new Exception("You can only put a nested query in an IN statement if it is the only value present");
}
HqlTokenProcessor.GetResultOfNestedQueryForInStatement(processor, compareValues);
}
else if (
val.WordType == HqlWordType.TEXT ||
val.WordType == HqlWordType.INT ||
val.WordType == HqlWordType.FLOAT ||
val.WordType == HqlWordType.LITERAL_STRING ||
val.WordType == HqlWordType.FIELD ||
val.WordType == HqlWordType.SCALAR
)
{
ExpectedValues = false;
compareValues.Add(val);
// HACK - sort of a hack this says if I can't find this field
// then add it to the select but make it not print out
HqlEvaluator.VerifyFieldPresence(select, val);
// END HACK
}
else
{
throw new Exception("Found invalid value in IN clause");
}
}
if (ExpectedValues)
{
throw new Exception("Expected additional values in IN clause");
}
if (compareValues.Count == 0)
{
throw new Exception("No values present in IN clause");
}
HqlCompareToken comparetoken = new HqlCompareToken(token1, compare, compareValues);
_q.Add(comparetoken);
processor.MoveNextToken();
}
else
{
throw new Exception(String.Format("Unknown {0} compare", _name));
}
}
return(true);
}
///////////////////////
// Static Functions
///////////////////////
// Constructors
public HqlKeywords(HqlKeyword keyword, string[] words)
{
_keyword = keyword;
_words = words;
}
