feat(#3742): fix all the code offences

eo-parser/src/main/java/org/eolang/parser/errors/Lines.java

@@ -37,14 +37,14 @@ final class Lines {
     /**
      * The source.
      */
-    private final List<Text> lines;
+    private final List<Text> source;
 
     /**
      * Ctor.
      * @param lines The source in lines
      */
     Lines(final List<Text> lines) {
-        this.lines = lines;
+        this.source = lines;
     }
 
     /**
@@ -54,10 +54,10 @@ final class Lines {
      */
     String line(final int number) {
         final Optional<String> result;
-        if (number < 1 || number > this.lines.size()) {
+        if (number < 1 || number > this.source.size()) {
             result = Optional.empty();
         } else {
-            result = Optional.ofNullable(this.lines.get(number - 1))
+            result = Optional.ofNullable(this.source.get(number - 1))
                 .map(UncheckedText::new)
                 .map(UncheckedText::asString);
         }

eo-parser/src/main/java/org/eolang/parser/errors/UnderlinedMessage.java

@@ -41,7 +41,7 @@
  * </p>
  * @since 0.50
  * @todo #3332:30min Add more decorators for the error message.
- *  For example, {@link org.eolang.parser.ParsingErrors} currently contains logic related to the message formatting.
+ *  For example, {@link ParsingErrors} currently contains logic related to the message formatting.
  *  It's better to create a separate class for this purpose.
  */
 final class UnderlinedMessage {

eo-parser/src/main/java/org/eolang/parser/errors/package-info.java

@@ -25,4 +25,4 @@
  * This package contains all the classes related to errors that can be found in the parsing process.
  * @since 0.50
  */
-package org.eolang.parser.errors;
+package org.eolang.parser.errors;

eo-parser/src/test/java/org/eolang/parser/errors/package-info.java

@@ -0,0 +1,28 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016-2024 Objectionary.com
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+/**
+ * Contains tests for the error handling in the parser.
+ * @since 0.50
+ */
+package org.eolang.parser.errors;