ParseTreeErrorListenerTest.java 文件源码

/**
 * Checks that exception is generated for YANG file with invalid syntax.
 */
@Test
public void checkInvalidYangFileForSyntaxError() throws IOException {

    // Get the exception occurred during parsing.
    thrown.expect(ParserException.class);
    thrown.expect(CustomExceptionMatcher.errorLocation(3, 0));
    thrown.expectMessage("no viable alternative at input 'yang-version 1\\nnamespace'");

    ANTLRInputStream input = new ANTLRFileStream("src/test/resources/YangFileWithSyntaxError.yang");

    // Create a lexer that feeds off of input char stream.
    GeneratedYangLexer lexer = new GeneratedYangLexer(input);
    // Create a buffer of tokens pulled from the lexer.
    CommonTokenStream tokens = new CommonTokenStream(lexer);
    // Create a parser that feeds off the tokens buffer.
    GeneratedYangParser parser = new GeneratedYangParser(tokens);
    // Remove console error listener.
    parser.removeErrorListeners();
    // Create instance of customized error listener.
    ParseTreeErrorListener parseTreeErrorListener = new ParseTreeErrorListener();
    // Add customized error listener to catch errors during parsing.
    parser.addErrorListener(parseTreeErrorListener);
    // Begin parsing YANG file and generate parse tree.
    ParseTree tree = parser.yangfile();
}