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Cfa subproject in the Theta model checking framework

There is a newer version: 6.8.5

/*
 *  Copyright 2024 Budapest University of Technology and Economics
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package hu.bme.mit.theta.cfa.dsl;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;

import org.antlr.v4.runtime.CharStream;
import org.antlr.v4.runtime.CharStreams;
import org.antlr.v4.runtime.CommonTokenStream;

import hu.bme.mit.theta.cfa.CFA;
import hu.bme.mit.theta.cfa.dsl.gen.CfaDslLexer;
import hu.bme.mit.theta.cfa.dsl.gen.CfaDslParser;
import hu.bme.mit.theta.cfa.dsl.gen.CfaDslParser.SpecContext;

public final class CfaDslManager {

    private CfaDslManager() {
    }

    public static CFA createCfa(final String inputString) throws IOException {
        final InputStream stream = new ByteArrayInputStream(
                inputString.getBytes(StandardCharsets.UTF_8.name()));
        return createCfa(stream);
    }

    public static CFA createCfa(final InputStream inputStream) throws IOException {
        final CharStream input = CharStreams.fromStream(inputStream);

        final CfaDslLexer lexer = new CfaDslLexer(input);
        final CommonTokenStream tokens = new CommonTokenStream(lexer);
        final CfaDslParser parser = new CfaDslParser(tokens);

        final SpecContext context = parser.spec();
        final CfaSpecification specification = CfaSpecification.fromContext(context);
        final CFA cfa = specification.instantiate();
        return cfa;
    }

}