xtext

I'm new to both Xtext and ANTLR. I need to translate an ANTLR (.g) grammar into an XTEXT (.xtext) grammar. In the ANTLR grammar there are syntactic predicates which are not supported by Xtext. Is there a way to remove/translate these predicates? Thanks EDIT The ANTLR grammar which I'm trying to translate can be found here: /* * Copyright 2009, Google Inc. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright

I created a DSL via Xtext and now I need to transform the models created in the editor into another model(s). I suppose the most straightforward way is to employ some kind of M2M transformation framework, but i need to access the model behind the textual file. Question: how can I get a reference to the model? The models created by Xtext have also a resource factory created for them. If you try to load the textual file as an EMF model, EMF will look for resource factories available for the extension of your textual file. From there, Xtext will transform the textual file in an EMF model and give

I'm using xtext 2.4. What I want to do is a SQL-like syntax. The things confuse me are I'm not sure which things should be treated as terminal/datatype/parser rules. So far my grammar related to MyTerm is: Model: (terms += MyTerm ';')* ; MyTerm: constant=MyConstant | variable?='?'| collection_literal=CollectionLiteral ; MyConstant : string=STRING | number=MyNumber | date=MYDATE | uuid=UUID | boolean=MYBOOLEAN | hex=BLOB ; MyNumber: int=SIGNINT | float=SIGNFLOAT ; SIGNINT returns ecore::EInt: '-'? INT ; SIGNFLOAT returns ecore::EFloat: '-'? INT '.' INT; ; CollectionLiteral: => MapLiteral |

I've a DSL written using Xtext. What I want is to execute that DSL to perform something good out of it. I wrote myDslGenerator class implementing the interface IGenerator in xtend to generate java code and it's working fine. I've two questions; What is the difference between Interpreter and Code Generator? Aren't both for executing DSL? How to write an interpreter? Any step by step tutorial link? I found many tutorial to generate code using xtend but couldn't find any for writing an interpreter. Thank you, Salman Basically, interpreters and code generators work really differently. Code

I'm writing an Eclipse/Xtext plugin for CoffeeScript, and I realized I'll probably need to write a lexer for it by hand. CoffeeScript parser also uses a hand-written lexer to handle indentation and other tricks in the grammar. Xtext generates a class that extends org.eclipse.xtext.parser.antlr.Lexer which in turn extends org.antlr.runtime.Lexer . So I suppose I'll have extend it. I can see two ways to do that Override mTokens() . This is done by the generated code, changing the internal state. Override nextToken() which seems a natural approach, but then I'll have to keep track of the internal

Abstract problem description: The way I see it, unparsing means to create a token stream from an AST, which when parsed again produces an equal AST. So parse(unparse(AST)) = AST holds. This is the equal to finding a valid parse tree which would produce the same AST. The language is described by a context free S-attributed grammar using a eBNF variant. So the unparser has to find a valid 'path' through the traversed nodes in which all grammar constraints hold. This bascially means to find a valid allocation of AST nodes to grammar production rules. This is a constraint satisfaction problem (CSP

I'm puzzled by this error: java.lang.NoClassDefFoundError: junit/framework/TestCase at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:792) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:188) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClassHoldingLock(ClasspathManager.java:638) ... at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.loadClass(RemoteTestRunner.java:693) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.loadClasses(RemoteTestRunner.java:429)