/*
 * Copyright 2013 Yuichiro Moriguchi
 *
 * 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 net.morilib.sed.parser;

import java.io.IOException;
import java.io.PushbackReader;

import net.morilib.sed.SedCommand;
import net.morilib.sed.SedCommandBundle;
import net.morilib.sed.SedCommandParser;
import net.morilib.sed.SedLineOption;
import net.morilib.sed.SedSyntaxException;
import net.morilib.sed.cmd.SedQCommand;

/**
 * qコマンドをパースするパーサです。
 *
 *
 * @author MORIGUCHI, Yuichiro 2013/03
 */
public class SedQParser implements SedCommandParser {

	public SedCommand parse(SedCommandBundle b,
			PushbackReader rd, SedLineOption l) throws IOException {
		int c, q = 0;

		if(l.options() > 1)  throw new SedSyntaxException();
		while((c = rd.read()) >= '0' && c <= '9') {
			q = q * 10 + (c - '0');
		}

		if(c >= 0 && c != '\n' && c != ';' && c != '}') {
			throw new SedSyntaxException();
		}
		return new SedQCommand(q);
	}

}
