eclipse-ocl-bot
commented
1 month ago By Ed Willink on Jun 27, 2009 01:53
"+" is needed by QVTr and QVTc too.
MDT-OCL must support OCL 2.0 and 2.1 as closely as is practical.
Introducing extensions is very dangerous. Support for language oversights such as an include statement may be appropriate, support for syntactic sugar is not.\ That said, MDT-OCL can provide support that enables extended languages to configure that support and exploit shared fuinctionality.
In the case of "+", there is no syntactic extension. It is just necessary to recognise a sysnonym.
org.eclipse.qvt.declarative.parser.qvt.environment.QVTTopLevelEnvironment overloads lookupOperation to invoke a resolveSynonym method.
We could perhaps introduce a configurable list of synonyms in an OCL Environment. This would follow on from perhaps promoting the CSTFile/CSTRoot/CSTChildEnvironment concepts from QVT Declarative to OCL. [OCL currently uses dynamic rather than nested environments for Let and Loop.]
| --- | --- | | Bugzilla Link | 281710 | | Status | CLOSED FIXED | | Importance | P3 normal | | Reported | Jun 26, 2009 16:42 EDT | | Modified | May 29, 2012 13:23 EDT | | Version | 1.3.0 | | Blocks | 156363 | | Reporter | Laurent Goubet |
Description
The "+" operator is available in most languages for String concatenation, and is as readable as can be for newcomers and "old" developpers alike. I believe adding this shortcut for "String#concat(String) : String" would be a good addition to the essential OCL grammar. I believe M2M QVTO's extended OCL grammar sports this addition; could it be taken down to MDT OCL?
This should probably be raised as an issue against the OCL specification so that this operations enters the standard instead of remaining a non-standard addition.