/**
 * Copyright 2002-2017 Evgeny Gryaznov
 *
 * 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 org.textmapper.lapg.regex;

import org.textmapper.lapg.api.regex.RegexContext;
import org.textmapper.lapg.api.regex.RegexQuantifier;
import org.textmapper.lapg.api.regex.RegexSwitch;
import org.textmapper.lapg.regex.RegexDefTree.TextSource;

/**
 * Gryaznov Evgeny, 4/5/11
 */
class RegexAstQuantifier extends RegexAstPart implements RegexQuantifier {

	private final int min, max;
	private RegexAstPart inner;

	public RegexAstQuantifier(RegexAstPart inner, int min, int max, TextSource source, int offset, int endoffset) {
		super(source, offset, endoffset);
		this.min = min;
		this.max = max;
		this.inner = inner;
	}

	@Override
	public int getMin() {
		return min;
	}

	@Override
	public int getMax() {
		return max;
	}

	@Override
	public RegexAstPart getInner() {
		return inner;
	}

	@Override
	protected void toString(StringBuilder sb) {
		inner.toString(sb);
		if (min == 0 && max == -1) {
			sb.append('*');
		} else if (min == 0 && max == 1) {
			sb.append('?');
		} else if (min == 1 && max == -1) {
			sb.append('+');
		} else {
			sb.append('{');
			sb.append(min);
			if (min != max) {
				sb.append(',');
				if (max != -1) {
					sb.append(max);
				}
			}
			sb.append('}');
		}
	}

	@Override
	public int getLength(RegexContext context) {
		if (min == max && min >= 0) {
			int length = inner.getLength(context);
			if (length >= 0) {
				return min * length;
			}
		}
		return -1;
	}

	@Override
	public <T> T accept(RegexSwitch<T> switch_) {
		return switch_.caseQuantifier(this);
	}
}