ParenExpression.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.fandev.lang.fan.parsing.expression.arithmetic;

import com.intellij.lang.PsiBuilder;
import com.intellij.psi.tree.TokenSet;
import static org.fandev.lang.fan.FanBundle.message;
import static org.fandev.lang.fan.FanElementTypes.*;
import static org.fandev.lang.fan.FanTokenTypes.LPAR;
import static org.fandev.lang.fan.FanTokenTypes.RPAR;
import org.fandev.lang.fan.parsing.expression.Expression;
import org.fandev.lang.fan.parsing.types.TypeSpec;
import static org.fandev.lang.fan.parsing.util.ParserUtils.getToken;
import static org.fandev.lang.fan.parsing.util.ParserUtils.removeNls;
import org.fandev.lang.fan.parsing.util.ParserUtils;
import org.fandev.lang.fan.parsing.statements.Statement;

/**
 * @author freds
 * @date Mar 1, 2009
 */
public class ParenExpression {
    public static boolean parse(final PsiBuilder builder, final TokenSet stopper) {
        PsiBuilder.Marker marker = builder.mark();
        boolean res;
        if (getToken(builder, LPAR)) {
            removeNls(builder);
            // First try cast expression then grouped expression
            res = parseCastExpression(builder, stopper);
            if (res) {
                marker.done(CAST_EXPR);
            } else {
                marker.rollbackTo();
                marker = builder.mark();
                // Eat the ( again
                ParserUtils.advanceNoNls(builder);
                res = Expression.parseExpr(builder, Statement.RPAR_STOPPER, EXPRESSION);
                getToken(builder, RPAR, message("rpar.expected"));
                if (res) {
                    res = TermExpression.parseTermChainLoop(builder, stopper);
                }
                marker.done(GROUPED_EXPR);
            }
        } else {
            marker.drop();
            res = UnaryExpression.parse(builder, stopper);
        }
        return res;
    }

    private static boolean parseCastExpression(final PsiBuilder builder, final TokenSet stopper) {
        if (TypeSpec.parse(builder)) {
            if (getToken(builder, RPAR, message("rpar.expected"))) {
                return parse(builder, stopper);
            }
        }
        return false;
    }
}