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Add additional code to inferred code in a method body [message #1725372]

Thu, 03 March 2016 06:24

Shrinivas Kini

Messages: 3
Registered: March 2016

Junior Member

I am developing a simple DSL which allows you create a type and all methods to it. I am using an XBlockExpression for the body of the method. When infering the Java Code using JvmModelInferrer I want to add some additional code around the 'inferred code' of the expression.

E.g. I want to want to nest the inferred code of the expression in a try-catch block. But I dont want the try-catch code to be expressed in the DSL.

grammar com.study.InterfaceDefinition with org.eclipse.xtext.xbase.Xbase

import "http://www.eclipse.org/xtext/common/JavaVMTypes" as types

InterfaceModel:
package=PackageDeclaration
importSection=XImportSection?
definition=InterfaceDef;

PackageDeclaration:
'package' name=QualifiedName;

InterfaceDef:
'Interface' name=ID
'Type' ':' (types+=ServiceType) (',' types+=ServiceType)*
newDef=NewDefinition);

NewDefinition:
'{'
(newMethods+=NewMethodDefinition)+
'}';

NewMethodDefinition:
commonModifier=CommonModifier
returnType=JvmTypeReference name=ValidID '('
(parameters+=Parameter (',' parameters+=Parameter)*)? ')'
expression=XBlockExpression;

Parameter:
parameterType=JvmTypeReference name=ValidID;

In the code for the inferrer I am inferring the code for method as follows

members += newMethod.toMethod(newMethod.name, newMethod.returnType ?: inferredType)
[
for (param : newMethod.parameters) {
parameters += newMethod.toParameter(param.name, param.parameterType)}

body = newMethod.expression
]

Instead of infering the code for method body as above, can I do something like this.

body = [
append("try { ")

--- append the inferred java code the expression here ----

append("catch(Exception e) { <some more code> }")
]

In the output I need the method body to look like this

{
try
{
// << Inferred Java Code for XExpression>>
}
catch (Exception ex)
{
ex.printStackTrace();
logger.error(ex.getMessage(), ex);
return generateInternalServerErrorResponse();
}
return generateNoContentResponse();
}

Any suggestions will be very helpful.

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Re: Add additional code to inferred code in a method body [message #1725460 is a reply to message #1725372]

Thu, 03 March 2016 15:56

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

This is currently not possible

But you can inferr 2 methods

(1) body=model.body

(2) body = ''' try .. <<nameof1>>(.....'''

(2 contains the code you want to wrap as string and calls 1)

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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