inputStream = clazz.getResourceAsStream( grammarFileName );
if ( inputStream == null ) {
throw new IllegalArgumentException( "The grammar test file " + grammarFileName + " couldn't be found." );
}
GrammarTestLexer lexer = new GrammarTestLexer(
new ANTLRInputStream(
inputStream
)
);
TokenStream tokens = new CommonTokenStream( lexer );