Xtext grammar more abstract classes instantiation
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I'm doing Expressions DSL using Xtext and I want some classes to inherit from some abstract ones.
Hierarchy:
Expression is an abstract class extended by BinaryOperation, UnaryOperation, Number and Atomic.
BinaryOperation is an abstract class extended by Add, Sub, Mul, Div, Power
UnaryOperation is an abstract class extended by UnaryPlus, UnaryMinus and Factorial.
Whole grammar:
Expressions:
elements+=EvalExpr;
EvalExpr:
'eval' expression=Expression ';';
Expression: AddOrSub;
UnaryOperation:
Expression;
BinaryOperation:
Expression;
AddOrSub returns BinaryOperation:
MulOrDivOrPower (( {Add.left=current} '+' |
{Sub.left=current} '-'
) right=MulOrDivOrPower)*;
MulOrDivOrPower returns BinaryOperation:
UnaryPlusOrMinus (( {Mul.left=current} '*' |
{Div.left=current} '/' |
{Power.left=current} '^'
) right=UnaryPlusOrMinus)*;
UnaryPlusOrMinus returns UnaryOperation:
'-' {UnaryMinus} expression=Factorial | '+' {UnaryPlus} expression=Factorial | Factorial;
Factorial returns UnaryOperation:
Atomic ({Factorial.expression=current} '!')?;
Atomic returns Expression:
'(' Expression ')' | Number;
Number returns Expression:
{IntConstant} value=INT;
But I'm seeing an error: A class may not be a super type of itself. How can I provide such a functionality ?
dsl xtext
asked Nov 25 '18 at 8:37
scanybossscanyboss
2016
add a comment |
I'm doing Expressions DSL using Xtext and I want some classes to inherit from some abstract ones.
Hierarchy:
Expression is an abstract class extended by BinaryOperation, UnaryOperation, Number and Atomic.
BinaryOperation is an abstract class extended by Add, Sub, Mul, Div, Power
UnaryOperation is an abstract class extended by UnaryPlus, UnaryMinus and Factorial.
Whole grammar:
Expressions:
elements+=EvalExpr;
EvalExpr:
'eval' expression=Expression ';';
Expression: AddOrSub;
UnaryOperation:
Expression;
BinaryOperation:
Expression;
AddOrSub returns BinaryOperation:
MulOrDivOrPower (( {Add.left=current} '+' |
{Sub.left=current} '-'
) right=MulOrDivOrPower)*;
MulOrDivOrPower returns BinaryOperation:
UnaryPlusOrMinus (( {Mul.left=current} '*' |
{Div.left=current} '/' |
{Power.left=current} '^'
) right=UnaryPlusOrMinus)*;
UnaryPlusOrMinus returns UnaryOperation:
'-' {UnaryMinus} expression=Factorial | '+' {UnaryPlus} expression=Factorial | Factorial;
Factorial returns UnaryOperation:
Atomic ({Factorial.expression=current} '!')?;
Atomic returns Expression:
'(' Expression ')' | Number;
Number returns Expression:
{IntConstant} value=INT;
But I'm seeing an error: A class may not be a super type of itself. How can I provide such a functionality ?
dsl xtext
asked Nov 25 '18 at 8:37
scanybossscanyboss
2016
you ususally writeXXXX returns Expression:everywhere.
– Christian Dietrich
Nov 26 '18 at 7:01
=> maybe you are at a point where you are better off with a manually maintained (imported) metamodel
– Christian Dietrich
Nov 26 '18 at 7:04
So there’s no option how to do this ? When I want to instantiate e.g. BinaryOperation in order to provide additional functionality on the semantics level ?
– scanyboss
Nov 26 '18 at 7:29
add a comment |
I'm doing Expressions DSL using Xtext and I want some classes to inherit from some abstract ones.
Hierarchy:
Expression is an abstract class extended by BinaryOperation, UnaryOperation, Number and Atomic.
BinaryOperation is an abstract class extended by Add, Sub, Mul, Div, Power
UnaryOperation is an abstract class extended by UnaryPlus, UnaryMinus and Factorial.
Whole grammar:
Expressions:
elements+=EvalExpr;
EvalExpr:
'eval' expression=Expression ';';
Expression: AddOrSub;
UnaryOperation:
Expression;
BinaryOperation:
Expression;
AddOrSub returns BinaryOperation:
MulOrDivOrPower (( {Add.left=current} '+' |
{Sub.left=current} '-'
) right=MulOrDivOrPower)*;
MulOrDivOrPower returns BinaryOperation:
UnaryPlusOrMinus (( {Mul.left=current} '*' |
{Div.left=current} '/' |
{Power.left=current} '^'
) right=UnaryPlusOrMinus)*;
UnaryPlusOrMinus returns UnaryOperation:
'-' {UnaryMinus} expression=Factorial | '+' {UnaryPlus} expression=Factorial | Factorial;
Factorial returns UnaryOperation:
Atomic ({Factorial.expression=current} '!')?;
Atomic returns Expression:
'(' Expression ')' | Number;
Number returns Expression:
{IntConstant} value=INT;
But I'm seeing an error: A class may not be a super type of itself. How can I provide such a functionality ?
dsl xtext
asked Nov 25 '18 at 8:37
scanybossscanyboss
2016
I'm doing Expressions DSL using Xtext and I want some classes to inherit from some abstract ones.
Hierarchy:
Expression is an abstract class extended by BinaryOperation, UnaryOperation, Number and Atomic.
BinaryOperation is an abstract class extended by Add, Sub, Mul, Div, Power
UnaryOperation is an abstract class extended by UnaryPlus, UnaryMinus and Factorial.
Whole grammar:
Expressions:
elements+=EvalExpr;
EvalExpr:
'eval' expression=Expression ';';
Expression: AddOrSub;
UnaryOperation:
Expression;
BinaryOperation:
Expression;
AddOrSub returns BinaryOperation:
MulOrDivOrPower (( {Add.left=current} '+' |
{Sub.left=current} '-'
) right=MulOrDivOrPower)*;
MulOrDivOrPower returns BinaryOperation:
UnaryPlusOrMinus (( {Mul.left=current} '*' |
{Div.left=current} '/' |
{Power.left=current} '^'
) right=UnaryPlusOrMinus)*;
UnaryPlusOrMinus returns UnaryOperation:
'-' {UnaryMinus} expression=Factorial | '+' {UnaryPlus} expression=Factorial | Factorial;
Factorial returns UnaryOperation:
Atomic ({Factorial.expression=current} '!')?;
Atomic returns Expression:
'(' Expression ')' | Number;
Number returns Expression:
{IntConstant} value=INT;
But I'm seeing an error: A class may not be a super type of itself. How can I provide such a functionality ?
dsl xtext
dsl xtext
asked Nov 25 '18 at 8:37
scanybossscanyboss
2016
asked Nov 25 '18 at 8:37
scanybossscanyboss
2016
asked Nov 25 '18 at 8:37
scanybossscanyboss
2016
asked Nov 25 '18 at 8:37
scanybossscanyboss
2016
asked Nov 25 '18 at 8:37
scanybossscanyboss
2016
2016
you ususally writeXXXX returns Expression:everywhere.
– Christian Dietrich
Nov 26 '18 at 7:01
=> maybe you are at a point where you are better off with a manually maintained (imported) metamodel
– Christian Dietrich
Nov 26 '18 at 7:04
So there’s no option how to do this ? When I want to instantiate e.g. BinaryOperation in order to provide additional functionality on the semantics level ?
– scanyboss
Nov 26 '18 at 7:29
add a comment |
you ususally writeXXXX returns Expression:everywhere.
– Christian Dietrich
Nov 26 '18 at 7:01
=> maybe you are at a point where you are better off with a manually maintained (imported) metamodel
– Christian Dietrich
Nov 26 '18 at 7:04
So there’s no option how to do this ? When I want to instantiate e.g. BinaryOperation in order to provide additional functionality on the semantics level ?
– scanyboss
Nov 26 '18 at 7:29
you ususally write
XXXX returns Expression: everywhere.– Christian Dietrich
Nov 26 '18 at 7:01
you ususally write
XXXX returns Expression: everywhere.– Christian Dietrich
Nov 26 '18 at 7:01
=> maybe you are at a point where you are better off with a manually maintained (imported) metamodel
– Christian Dietrich
Nov 26 '18 at 7:04
=> maybe you are at a point where you are better off with a manually maintained (imported) metamodel
– Christian Dietrich
Nov 26 '18 at 7:04
So there’s no option how to do this ? When I want to instantiate e.g. BinaryOperation in order to provide additional functionality on the semantics level ?
– scanyboss
Nov 26 '18 at 7:29
So there’s no option how to do this ? When I want to instantiate e.g. BinaryOperation in order to provide additional functionality on the semantics level ?
– scanyboss
Nov 26 '18 at 7:29
add a comment |
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you ususally write
XXXX returns Expression:everywhere.– Christian Dietrich
Nov 26 '18 at 7:01
=> maybe you are at a point where you are better off with a manually maintained (imported) metamodel
– Christian Dietrich
Nov 26 '18 at 7:04
So there’s no option how to do this ? When I want to instantiate e.g. BinaryOperation in order to provide additional functionality on the semantics level ?
– scanyboss
Nov 26 '18 at 7:29