Hello,
A while ago I posted a question on stackoverflow asking how to embed C++ code
in a xtext (2.9.1) DSL [1]. Ultimately we went with a custom ANTLR 4 (4.5.1)
lexer making heavy use of lexing modes. While the lexer works as intended, it
does depend on an ANTLR 4 jar, which breaks generating the xtext grammar
artifacts:
0 [main] ERROR mf.mwe2.launch.runtime.Mwe2Launcher - EOF_TOKEN
java.lang.NoSuchFieldError: EOF_TOKEN
at org.eclipse.xtext.parser.antlr.Lexer.nextToken(Lexer.java:59)
at
org.antlr.runtime.BufferedTokenStream.fetch(BufferedTokenStream.java:143)
at
org.antlr.runtime.BufferedTokenStream.sync(BufferedTokenStream.java:137)
at
org.antlr.runtime.BufferedTokenStream.fill(BufferedTokenStream.java:286)
at
org.antlr.runtime.BufferedTokenStream.toString(BufferedTokenStream.java:251)
at
org.eclipse.xtext.parser.antlr.AbstractInternalAntlrParser.parse(AbstractInternalAntlrParser.java:534)
at
org.eclipse.xtext.parser.antlr.AbstractAntlrParser.doParse(AbstractAntlrParser.java:102)
at
org.eclipse.xtext.parser.antlr.AbstractAntlrParser.parse(AbstractAntlrParser.java:84)
at
org.eclipse.xtext.parser.antlr.AbstractAntlrParser.doParse(AbstractAntlrParser.java:62)
at org.eclipse.xtext.parser.AbstractParser.parse(AbstractParser.java:33)
at
org.eclipse.xtext.resource.XtextResource.doLoad(XtextResource.java:170)
at
org.eclipse.xtext.linking.lazy.LazyLinkingResource.doLoad(LazyLinkingResource.java:100)
at
org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1518)
at
org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1297)
at
org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoad(ResourceSetImpl.java:259)
at
org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoadHelper(ResourceSetImpl.java:274)
at
org.eclipse.xtext.resource.XtextResourceSet.getResource(XtextResourceSet.java:265)
at
org.eclipse.xtext.resource.SynchronizedXtextResourceSet.getResource(SynchronizedXtextResourceSet.java:25)
at
org.eclipse.emf.mwe2.launch.runtime.Mwe2Runner.run(Mwe2Runner.java:57)
at
org.eclipse.emf.mwe2.launch.runtime.Mwe2Runner.run(Mwe2Runner.java:52)
at
org.eclipse.emf.mwe2.launch.runtime.Mwe2Launcher.run(Mwe2Launcher.java:78)
at
org.eclipse.emf.mwe2.launch.runtime.Mwe2Launcher.main(Mwe2Launcher.java:36)
Removing that jar from the plug-in runtime classpath makes generating the
grammar possible but then we have to add it back in when launching the plug-in.
I’m not very familiar with java development so I’m at a loss here. Is there a
way to make xtext ignore that jar when generating artifacts? What is the
proper/idiomatic way of handling this problem?
Thank you!
[1] —
http://stackoverflow.com/questions/35806402/how-to-embed-c-code-in-a-xtext-dsl
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