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Custom External Lexer xText 2.10 [message #1736592]

Thu, 30 June 2016 09:40

Eclipse User

Hi !

First of all : sorry for my poor English...

I have a 2.4 xtext project which I'm trying to migrate to a maven 2.10 xtext project. Everything seems to work except one thing...

I had an external custom lexer like this :

                        fragment = org.eclipse.xtext.generator.parser.antlr.ex.rt.AntlrGeneratorFragment {
				antlrParam = "-Xconversiontimeout"
				antlrParam = "30000"
			    options = {
			        backtrack = true
			        backtrackLexer = false
			    }
			}
			
			// Uses ANTLR Tools to compile a custom lexer and will also add a binding in the runtime module to use the Lexer
			fragment = parser.antlr.ex.ExternalAntlrLexerFragment {
			    // A grammar file with .g will be expected in this package (should be stored in src folder)
			    lexerGrammar = "com.group.xxx.xtext.customlexer.CustomEditorLexer"
			    runtime = true
			    antlrParam = "-lib"
			    // This is the folder where the lexer will be created
			    antlrParam = "${runtimeProject}/src-gen/com/group/xxx/xtext/customlexer"

But with the new xtext generator i don't know how to go...
I try something like this :

                  language = StandardLanguage {
			name = "com.group.xxx.xtext.Editor"
			fileExtensions = "xxx"

			serializer = {
				generateStub = false
			}
			
			parserGenerator = {
				combinedGrammar = false
			    antlrParam = "com.group.xxx.xtext/src/com/group/xxx/xtext/customlexer"
				options = {
					backtrack = true
			        backtrackLexer = false
				}
			}
}

That well divides parser and lexer in the gen-folder but the reference of my external lexer not seem to work
Can you advise me on this plz ?

Re: Custom External Lexer xText 2.10 [message #1737477 is a reply to message #1736592]

Fri, 08 July 2016 10:26

Eclipse User

The StandardLanguage uses the default fragments only. You may try to write your own XtextGeneratorLanguage class and use the FragmentAdapter to wrap the ExternalAntlrLexerFragment.
If that doesn't work, you better to stick with the old workflow.

Re: Custom External Lexer xText 2.10 [message #1737653 is a reply to message #1737477]

Mon, 11 July 2016 11:06

Eclipse User

I don't know whether we have migrated the ExternalAntlrLexerFragment functionality. You could try the adapter as mentioned by Jan:

fragment = org.eclipse.xtext.generator.adapter.FragmentAdapter {
	fragment = parser.antlr.ex.ExternalAntlrLexerFragment {
		// A grammar file with .g will be expected in this package (should be stored in src folder)
		lexerGrammar = "com.group.xxx.xtext.customlexer.CustomEditorLexer"
		runtime = true
		antlrParam = "-lib"
		// This is the folder where the lexer will be created
		antlrParam = "${runtimeProject}/src-gen/com/group/xxx/xtext/customlexer"
	}
}

Add that to the StandardLanguage or, if that doesn't work, replace StandardLanguage by XtextGeneratorLanguage as described in the documentation:
https://www.eclipse.org/Xtext/documentation/302_configuration.html#language-configuration

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