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I have found problems using lexer (antlr part) and even following documentation at http://lexer.netbeans.org/doc/lexer-generators.html#antlr is almost impossible. I am going to create a branch and suggest some changes.
To get the branch: cd lexer cvs upd -r uneasy_usage_29966
Added support for testing of generated XXXLanguage class. Check: lexer/demo/src/org/netbeans/modules/lexer/demo/PaneDemo.java,v revision: 1.2.8.1; lexer/src/org/netbeans/modules/lexer/antlr/antlrLangBuild.xml,v revision: 1.2.6.3
In the last usability update that I've just commited into cvs I've make EditorPaneDemo class that uses the code provided in the branch. I'm marking this issue as fixed please reopen if necessary.