Example usage for org.antlr.v4.tool Grammar getRule

Introduction

In this page you can find the example usage for org.antlr.v4.tool Grammar getRule.

Prototype

public Rule getRule(int index) 

Source Link

Usage

From source file:net.certiv.json.test.base.AbstractBase.java

License:Open Source License

protected void checkSymbols(Grammar g, String rulesStr, String allValidTokensStr) throws Exception {
    String[] typeToTokenName = g.getTokenNames();
    Set<String> tokens = new HashSet<String>();
    for (int i = 0; i < typeToTokenName.length; i++) {
        String t = typeToTokenName[i];
        if (t != null) {
            if (t.startsWith(Grammar.AUTO_GENERATED_TOKEN_NAME_PREFIX)) {
                tokens.add(g.getTokenDisplayName(i));
            } else {
                tokens.add(t);/* w w  w . ja v a 2s  . c  o  m*/
            }
        }
    }

    // make sure expected tokens are there
    StringTokenizer st = new StringTokenizer(allValidTokensStr, ", ");
    while (st.hasMoreTokens()) {
        String tokenName = st.nextToken();
        assertTrue("token " + tokenName + " expected, but was undefined",
                g.getTokenType(tokenName) != Token.INVALID_TYPE);
        tokens.remove(tokenName);
    }
    // make sure there are not any others (other than <EOF> etc...)
    for (String tokenName : tokens) {
        assertTrue("unexpected token name " + tokenName, g.getTokenType(tokenName) < Token.MIN_USER_TOKEN_TYPE);
    }

    // make sure all expected rules are there
    st = new StringTokenizer(rulesStr, ", ");
    int n = 0;
    while (st.hasMoreTokens()) {
        String ruleName = st.nextToken();
        assertNotNull("rule " + ruleName + " expected", g.getRule(ruleName));
        n++;
    }
    Assert.assertEquals("number of rules mismatch; expecting " + n + "; found " + g.rules.size(), n,
            g.rules.size());
}

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From source file:org.opencypher.tools.grammar.Antlr4TestUtils.java

License:Apache License

private static void parseWithListeners(Grammar grammar, String query, ANTLRErrorListener lexerListener,
        ANTLRErrorListener parserListener) {
    LexerInterpreter lexer = grammar.createLexerInterpreter(new ANTLRInputStream(query));
    ParserInterpreter parser = grammar.createParserInterpreter(new CommonTokenStream(lexer));
    lexer.removeErrorListeners();// ww w .  j  a  v a  2  s  . c  o  m
    parser.removeErrorListeners();
    lexer.addErrorListener(lexerListener);
    parser.addErrorListener(parserListener);
    parser.parse(grammar.getRule(Antlr4.PREFIX + "Cypher").index);
}

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