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How to use cacheRegex method of org.evomaster.client.java.instrumentation.coverage.methodreplacement.regex.RegexGraph class

Best EvoMaster code snippet using org.evomaster.client.java.instrumentation.coverage.methodreplacement.regex.RegexGraph.cacheRegex

Source:RegexGraph.java

...67        if (!regexAutomatonCache.containsKey(regex)) {68            /*69             * Create an automaton representing the regex70             */71            cacheRegex(regex);72        }73        Automaton automaton = regexAutomatonCache.get(regex);74        return automaton;75    }76    private Map<Integer, Map<State, Set<GraphTransition>>> createGraph(String arg, String regex) {77        /*78         * Create a graph to calculate the distance. The algorithm is based on what discussed in:79         *80         * Mohammad Alshraideh and Leonardo Bottaci81         * Search-based software test data generation for string data using program-specific search operators82         * http://neo.lcc.uma.es/mase/attachments/085_TestDataGenerationForStringData.pdf83         *84         * and85         *86         * EUGENE W. MYERS and WEBB MILLER87         * APPROXIMATE MATCHING OF REGULAR EXPRESSIONS88         * http://www.cs.mun.ca/~harold/Courses/Old/Ling6800.W06/Diary/reg.aprox.pdf89         */90        Automaton automaton = getAndCacheAutomaton(regex);91        final int NUM_CHARS = arg.length();92        List<State> topologicalOrder = regexStateCache.get(regex);93        Map<Integer, Map<State, Set<GraphTransition>>> transitions = new HashMap<>();94        intToStateMap = new HashMap<>();95        stateToIntMap = new HashMap<>();96        int numState = 0;97        for (State currentState : topologicalOrder) {98            /*99             * Init data structure to quickly map/access state/index100             */101            stateToIntMap.put(currentState, numState);102            intToStateMap.put(numState, currentState);103            numState++;104            for (Transition t : currentState.getTransitions()) {105                State destination = t.getDest();106                ensureState(transitions, destination, NUM_CHARS);107                for (int row = 0; row <= NUM_CHARS; row++) {108                    /*109                     *  add an insertion edge from currentState in row to target state in same row110                     */111                    transitions.get(row).get(destination)112                            .add(new GraphTransition(1.0, row, currentState, GraphTransition.TransitionType.INSERTION));113                }114                for (int row = 0; row < NUM_CHARS; row++) {115                    /*116                     *  Add a replacement edge from currentState in row to t.getDest in row+1117                     *  if charAt row+1 == the parameter of this transition, this is a zero-cost edge118                     */119                    double cost = 0.0;120                    if (arg.charAt(row) < t.getMin() || arg.charAt(row) > t.getMax()) {121                        int distMin = Math.abs(arg.charAt(row) - t.getMin());122                        int distMax = Math.abs(arg.charAt(row) - t.getMax());123                        cost = normalize(Math.min(distMin, distMax));124                    }125                    /*126                     * Important: even if the cost is 0 (eg match on the arg/regex in which we replace char X with X), we CANNOT127                     * use a PHANTOM transition. Even if we do not replace anything, we still need to consider it as a replacement128                     * transition. Consider the case129                     *130                     *  "ac".matches("abc")131                     *132                     *  If we used a phantom transition to represent the alignment c/c, then it would be possible to insert 'b' in the133                     *  middle of "abc". On the other hand, if we use a replacement c/c, then inserting 'b' would not be allowed, as an134                     *  insertion cannot be followed by a replacement.135                     */136                    transitions.get(row + 1).get(destination)137                            .add(new GraphTransition(cost, row, currentState, GraphTransition.TransitionType.REPLACEMENT));138                }139            }140            ensureState(transitions, currentState, NUM_CHARS);141            for (int row = 0; row < NUM_CHARS; row++) {142                /*143                 * add a deletion edge with cost 1 from currentState to currentState in next row144                 */145                transitions.get(row + 1).get(currentState)146                        .add(new GraphTransition(1.0, row, currentState, GraphTransition.TransitionType.DELETION));147            }148        }149        // Add zero-cost transitions from accepting states to final state150        State finalState = new State();151        ensureState(transitions, finalState, NUM_CHARS);152        for (State s : automaton.getStates()) {153            if (s.isAccept()) {154                transitions.get(NUM_CHARS).get(finalState)155                        .add(new GraphTransition(0, NUM_CHARS, s, GraphTransition.TransitionType.PHANTOM));156            }157        }158        intToStateMap.put(numState, finalState);159        stateToIntMap.put(finalState, numState);160        return transitions;161    }162    /**163     * Ensure that each row has the full data structures containing the target state164     *165     */166    private static void ensureState(167            Map<Integer, Map<State, Set<GraphTransition>>> transitions,168            State state,169            int numRows) {170        for (int row = 0; row <= numRows; row++) {171            if (!transitions.containsKey(row)) {172                transitions.put(row, new HashMap<>());173            }174            if (!transitions.get(row).containsKey(state)) {175                transitions.get(row).put(state, new HashSet<>());176            }177        }178    }179    private static void cacheRegex(String regex) {180        String r = RegexUtils.expandRegex(regex);181        Automaton automaton = new RegExp(r, RegExp.NONE).toAutomaton();182        automaton.expandSingleton();183        // We convert this to a graph without self-loops in order to determine the topological order184        DirectedGraph<State, DefaultEdge> regexGraph = new DefaultDirectedGraph<>(DefaultEdge.class);185        Set<State> visitedStates = new HashSet<>();186        Queue<State> states = new LinkedList<>();187        State initialState = automaton.getInitialState();188        states.add(initialState);189        while (!states.isEmpty()) {190            State currentState = states.poll();191            if (visitedStates.contains(currentState)) {192                continue;193            }...

cacheRegex

Using AI Code Generation

1import org.evomaster.client.java.instrumentation.coverage.methodreplacement.regex.RegexGraph;2import java.util.List;3import java.util.Map;4import java.util.Set;5import java.util.ArrayList;6import java.util.HashMap;7import java.util.HashSet;8import java.util.LinkedHashMap;9import java.util.LinkedHashSet;10import java.util.stream.Collectors;11import java.util.stream.Stream;12import java.util.stream.IntStream;13import java.util.regex.Pattern;14import java.util.regex.Matcher;15import java.util.regex.MatchResult;

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