public QueryConditionNode(QField lvalue, Conditions conditions, QConst rvalue)
: base()
{
_RValue = rvalue;
_Condition = conditions;
_LValue = lvalue;
}
protected QueryNode ParseCondition(string input, int startIdx, out int endIdx)
{
IQueryValue leftValue = ParseInternal(input, startIdx, out endIdx);
// special case if legacy 'allow dump constants' mode is on
if (AllowDumpConstants && leftValue is QConst)
leftValue = new QField( ((QConst)leftValue).Value.ToString() );
int nextEndIdx;
Conditions conditions = Conditions.Equal;
LexemType nextLexemType = GetLexemType(input, endIdx, out nextEndIdx);
if (!GetCondition(nextLexemType, input, endIdx, ref nextEndIdx, ref conditions))
throw new RelExParseException(
String.Format("Invalid syntax (position: {0}, expression: {1})", startIdx, input ) );
IQueryValue rightValue = ParseInternal(input, nextEndIdx, out endIdx);
QueryNode node;
if (IsNullValue(rightValue)) {
if ( (conditions & Conditions.Equal)!=0 ) {
// as for now, use strict casting to appropriate lvalue/rvalue types
// node = new QueryConditionNode( leftValue, Conditions.Null | (conditions & ~Conditions.Equal), null);
node = new QueryConditionNode( (QField)leftValue, Conditions.Null | (conditions & ~Conditions.Equal), null);
}
else {
throw new RelExParseException(
String.Format("Invalid syntax - such condition cannot be used with 'null' (position: {0}, expression: {1})", startIdx, input ) );
}
} else {
// as for now, use strict casting to appropriate lvalue/rvalue types
// node = new QueryConditionNode( leftValue, conditions, rightValue);
node = new QueryConditionNode( (QField)leftValue, conditions, (QConst)rightValue);
}
return node;
}
