private void AddLastRewritings(OperationCallExp operationCallExp, OperationInfo operationInfo)
{
AddCollectionAccessRewritings(operationCallExp, "{{last()}}", operationInfo);
}
private void AddCollectionAccessRewritings(OperationCallExp operationCallExp, string accesExpr, OperationInfo operationInfo)
{
TranslationOption optionIndex = new TranslationOption();
SubexpressionTranslations.AddTranslationOption(operationCallExp, optionIndex);
// XPath filter changes context - no variable corresponds to the context in this case
optionIndex.ContextVariableForSubExpressions = null;
optionIndex.ContextVariableChangeOnlyIn = 1;
// in some special cases, parentheses can be omitted
bool omitParentheses = false;
if (operationCallExp.Source is LiteralExp)
{
omitParentheses = true;
}
if (operationCallExp.Source is VariableExp)
{
omitParentheses = true;
}
if (!operationInfo.IsXPathInfix && !operationInfo.IsXPathPrefix &&
!operationInfo.IsAmong(OperationHelper.firstOperationInfo, OperationHelper.lastOperationInfo, OperationHelper.atOperationInfo))
{
omitParentheses = true;
}
if (omitParentheses)
{
optionIndex.FormatString = string.Format("({{0}})[{0}]", accesExpr);
}
else
{
optionIndex.FormatString = string.Format("({{0}})[{0}]", accesExpr);
}
optionIndex.LogMessagesWhenSelected = new List <LogMessage <OclExpression> >();
optionIndex.LogMessagesWhenSelected.Add(new LogMessage <OclExpression>()
{
Tag = operationCallExp, MessageText =
"Using indexing returns empty sequence when indexes are out of bounds (no error reported, unlike in OCL). "
});
}
public void AddFirstRewritings(OperationCallExp operationCallExp, OperationInfo operationInfo)
{
AddCollectionAccessRewritings(operationCallExp, "1", operationInfo);
}