/*
 * Copyright 2009-2012 by The Regents of the University of California
 * 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 from
 * 
 *     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 edu.uci.ics.asterix.lexergenerator.rules;

public class RuleAnythingUntil implements Rule {

    private char expected;

    public RuleAnythingUntil clone() {
        return new RuleAnythingUntil(expected);
    }

    public RuleAnythingUntil(char expected) {
        this.expected = expected;
    }

    @Override
    public String toString() {
        return " .* " + String.valueOf(expected);
    }

    @Override
    public int hashCode() {
        return 10 * (int) expected;
    }

    @Override
    public boolean equals(Object o) {
        if (o == null)
            return false;
        if (o instanceof RuleAnythingUntil) {
            if (((RuleAnythingUntil) o).expected == this.expected) {
                return true;
            }
        }
        return false;
    }

    @Override
    public String javaAction() {
        return "currentChar = readNextChar();";
    }

    @Override
    public String javaMatch(String action) {
        StringBuilder result = new StringBuilder();
        result.append("boolean escaped = false;");
        result.append("while (currentChar!='").append(expected).append("' || escaped)");
        result.append("{\nif(!escaped && currentChar=='\\\\\\\\'){escaped=true;}\nelse {escaped=false;}\ncurrentChar = readNextChar();\n}");
        result.append("\nif (currentChar=='").append(expected).append("'){");
        result.append(action);
        result.append("}\n");
        return result.toString();
    }

}