Examples with FrequencySet org.antlr.v4.misc.FrequencySet used on opensource projects

Example 6 with FrequencySet

use of org.antlr.v4.misc.FrequencySet in project antlr4 by tunnelvisionlabs.

the class RuleFunction method getElementFrequenciesForAlt.

/**
 * Given list of X and r refs in alt, compute how many of each there are
 */
protected Tuple2<FrequencySet<String>, FrequencySet<String>> getElementFrequenciesForAlt(AltAST ast) {
    try {
        ElementFrequenciesVisitor visitor = new ElementFrequenciesVisitor(rule.g, new CommonTreeNodeStream(new GrammarASTAdaptor(), ast));
        visitor.outerAlternative();
        if (visitor.frequencies.size() != 1) {
            factory.getGrammar().tool.errMgr.toolError(ErrorType.INTERNAL_ERROR);
            return Tuple.create(new FrequencySet<String>(), new FrequencySet<String>());
        }
        return Tuple.create(visitor.getMinFrequencies(), visitor.frequencies.peek());
    } catch (RecognitionException ex) {
        factory.getGrammar().tool.errMgr.toolError(ErrorType.INTERNAL_ERROR, ex);
        return Tuple.create(new FrequencySet<String>(), new FrequencySet<String>());
    }
}