/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * This file is available under and governed by the GNU General Public
 * License version 2 only, as published by the Free Software Foundation.
 * However, a notice that is now available elsewhere in this distribution
 * accompanied the original version of this file, and, per its terms,
 * should not be removed.
 */

package jdk.internal.org.commonmark.parser;

import jdk.internal.org.commonmark.node.SourceSpan;

/**
 * A line or part of a line from the input source.
 *
 * @since 0.16.0
 */
public class SourceLine {

    private final CharSequence content;
    private final SourceSpan sourceSpan;

    public static SourceLine of(CharSequence content, SourceSpan sourceSpan) {
        return new SourceLine(content, sourceSpan);
    }

    private SourceLine(CharSequence content, SourceSpan sourceSpan) {
        if (content == null) {
            throw new NullPointerException("content must not be null");
        }
        this.content = content;
        this.sourceSpan = sourceSpan;
    }

    public CharSequence getContent() {
        return content;
    }

    public SourceSpan getSourceSpan() {
        return sourceSpan;
    }

    public SourceLine substring(int beginIndex, int endIndex) {
        CharSequence newContent = content.subSequence(beginIndex, endIndex);
        SourceSpan newSourceSpan = null;
        if (sourceSpan != null) {
            int columnIndex = sourceSpan.getColumnIndex() + beginIndex;
            int length = endIndex - beginIndex;
            if (length != 0) {
                newSourceSpan = SourceSpan.of(sourceSpan.getLineIndex(), columnIndex, length);
            }
        }
        return SourceLine.of(newContent, newSourceSpan);
    }
}