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Venice, a Lisp implemented in Java

There is a newer version: 1.12.35

/*   __    __         _
 *   \ \  / /__ _ __ (_) ___ ___
 *    \ \/ / _ \ '_ \| |/ __/ _ \
 *     \  /  __/ | | | | (_|  __/
 *      \/ \___|_| |_|_|\___\___|
 *
 *
 * Copyright 2017-2024 Venice
 *
 * 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 com.github.jlangch.venice.impl.util.markdown.block;

import com.github.jlangch.venice.impl.reader.LineReader;
import com.github.jlangch.venice.impl.util.StringUtil;


public class TitleBlockParser {

    public TitleBlockParser(final LineReader reader) {
        this.reader = reader;
    }

    public TitleBlock parse() {
        if (reader.eof()) {
            return new TitleBlock();
        }

        String line = StringUtil.trimToEmpty(reader.peek());

        if (TitleBlockParser.isBlockStart(line)) {
            int level = 0;
            while (!line.isEmpty() && line.startsWith("#")) {
                level++;
                line = line.substring(1);
            }

            final String text = StringUtil.trimToEmpty(line);
            if (!text.isEmpty()) {
                reader.consume();
                return new TitleBlock(text, level);
            }
        }

        return new TitleBlock();
    }

    public static boolean isBlockStart(final String line) {
        return line.startsWith("#") && !line.matches("[#]+");
    }


    private final LineReader reader;
}