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Xta subproject in the Theta model checking framework
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/*
 *  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.xta.dsl;

import static com.google.common.base.Preconditions.checkNotNull;

import java.util.ArrayList;
import java.util.List;

import hu.bme.mit.theta.common.dsl.Env;
import hu.bme.mit.theta.core.type.Expr;
import hu.bme.mit.theta.core.type.arraytype.ArrayReadExpr;
import hu.bme.mit.theta.core.utils.TypeUtils;
import hu.bme.mit.theta.xta.Label;
import hu.bme.mit.theta.xta.Sync;
import hu.bme.mit.theta.xta.dsl.gen.XtaDslParser.SyncContext;
import hu.bme.mit.theta.xta.utils.ChanType;
import hu.bme.mit.theta.xta.utils.LabelExpr;

final class XtaSync {

    private final XtaExpression expression;
    private final SyncKind syncKind;

    public XtaSync(final XtaTransition scope, final SyncContext context) {
        checkNotNull(scope);
        checkNotNull(context);
        expression = new XtaExpression(scope, context.fExpression);
        syncKind = context.fRecv != null ? SyncKind.RECV : SyncKind.EMIT;
    }

    public enum SyncKind {
        EMIT, RECV
    }

    public Sync instantiate(final Env env) {
        final Expr expr = expression.instantiate(env);
        TypeUtils.cast(expr, ChanType.getInstance());

        final List> args = new ArrayList<>();
        final Label label = extractLabel(expr, args);

        if (syncKind == SyncKind.EMIT) {
            return Sync.emit(label, args);
        } else if (syncKind == SyncKind.RECV) {
            return Sync.recv(label, args);
        } else {
            throw new AssertionError();
        }
    }

    private Label extractLabel(final Expr expr, final List> args) {
        if (expr instanceof LabelExpr) {
            final LabelExpr labelExpr = (LabelExpr) expr;
            return labelExpr.getLabel();
        } else if (expr instanceof ArrayReadExpr) {
            final ArrayReadExpr arrayReadExpr = (ArrayReadExpr) expr;
            final Expr arrayExpr = arrayReadExpr.getArray();
            final Expr indexExpr = arrayReadExpr.getIndex();
            args.add(indexExpr);
            return extractLabel(arrayExpr, args);
        } else {
            throw new AssertionError();
        }
    }

}