/*
 * Copyright 2021, TeamDev. All rights reserved.
 *
 * 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
 *
 * Redistribution and use in source and/or binary forms, with or without
 * modification, must retain the above copyright notice and the following
 * disclaimer.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package io.spine.tools.javadoc.style.formatting;

import com.google.common.annotations.VisibleForTesting;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import static java.lang.String.format;
import static java.util.regex.Matcher.quoteReplacement;

/**
 * A formatting action, which handles a text in backticks.
 *
 * <p>The action will replace text enclosed into backticks (e.g. {@code `text`}) with
 * the same text wrapped into the {@literal @}{@code code} Javadoc tag.
 *
 * <p>A multi-line text is not supported, e.g a text as follows will not be handled:
 * <pre>{@code
 * `some multi
 * lined text`
 * }</pre>
 */
final class BacktickedToCode extends ByLineFormatting {

    @VisibleForTesting
    public static final String BACKTICK = "`";
    private static final Pattern PATTERN_BACKTICK = Pattern.compile(BACKTICK);

    /**
     * A pattern to match a text surrounded with backticks.
     */
    private static final Pattern PATTERN_TEXT_IN_BACKTICKS = Pattern.compile("(`[^`]*?`)");

    @Override
    @SuppressWarnings("JdkObsolete") // to address later.
    String formatLine(String line) {
        // Double the line size to avoid possible memory reallocation.
        StringBuffer buffer = new StringBuffer(line.length() * 2);

        Matcher matcher = PATTERN_TEXT_IN_BACKTICKS.matcher(line);
        while (matcher.find()) {
            String partToFormat = matcher.group();
            String partWithoutBackticks = PATTERN_BACKTICK.matcher(partToFormat)
                                                          .replaceAll("");
            String replacement = wrapWithCodeTag(partWithoutBackticks);
            matcher.appendReplacement(buffer, quoteReplacement(replacement));
        }
        matcher.appendTail(buffer);
        @SuppressWarnings("JdkObsolete") // `StringBuffer` use dictated by regex API.
        String result = buffer.toString();
        return result;
    }

    @VisibleForTesting
    static String wrapWithCodeTag(String value) {
        return format("{@code %s}", value);
    }
}

@@ -1936,78 +1936,8 @@
  %7B%0A%0A
-    @VisibleForTesting%0A    public static final String BACKTICK = %22%60%22;%0A
     
@@ -1965,24 +1965,16 @@
 Pattern 
-PATTERN_
 BACKTICK
@@ -1992,24 +1992,19 @@
 compile(
-BACKTICK
+%22%60%22
 );%0A%0A    
@@ -2108,24 +2108,16 @@
 Pattern 
-PATTERN_
 TEXT_IN_
@@ -2178,66 +2178,8 @@
 ide%0A
-    @SuppressWarnings(%22JdkObsolete%22) // to address later.%0A
     
@@ -2376,24 +2376,16 @@
 tcher = 
-PATTERN_
 TEXT_IN_
@@ -2461,27 +2461,29 @@
  String 
-partToForma
+backtickedTex
 t = matc
@@ -2518,142 +2518,36 @@
 ing 
-partWithoutBackticks = PATTERN_BACKTICK.matcher(partToFormat)%0A                                                          .replaceAll(%22%22
+text = untick(backtickedText
 );%0A 
@@ -2598,28 +2598,12 @@
 Tag(
-partWithoutBackticks
+text
 );%0A 
@@ -2884,16 +2884,169 @@
 %0A    %7D%0A%0A
+    private static String untick(String backtickedText) %7B%0A        return BACKTICK.matcher(backtickedText)%0A                       .replaceAll(%22%22);%0A    %7D%0A%0A
     @Vis

Improve names, extract method