| [xText] Pulling up features into common super class [message #58352] |
Tue, 14 July 2009 11:47 |
Eclipse User |
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Originally posted by: c.krause.cwi.nl
Hi all,
I want xText to generate a common superclass for two types and to pull
up a feature into this superclass. More specifically, I have my grammar
for arithmetical expressions:
/* ----- N-ary Operations ----- */
Addition returns Expression:
Subtraction ( {Addition.operands += current} ('+' operands +=
Subtraction)+)?;
Multiplication returns Expression:
Division ( {Multiplication.operands += current} ('*' operands +=
Division)+)?;
/* ----- Binary Operations ----- */
Subtraction returns Expression:
Multiplication ( {Subtraction.left = current} '-' right =
Multiplication)?;
Division returns Expression:
Operation ( {Division.left = current} '/' right = Operation)?;
Operation returns Expression:
Literal | '(' Addition ')';
....and I would like to have the following type hierarchy generated:
* Operation, Literal -> Expression
* BinaryOperation, NaryOperation -> Operation
* Addition, Multiplication -> NaryOperation
* Subtraction, Division -> BinaryOperation
In all my attempts I ended up with a cyclic hierarchy. What I basically
tried to do is to add a dummy rule:
Operation:
BinaryOperation | NaryOperation;
I believe the problem is that in my current model Operation is not a type.
If anybody has a hint, I'd appreciate any help. Anyway, I will try to
get it working somehow..
Cheers,
Christian
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