feat(#779): Add j$ Prefix For Packages

src/main/java/org/eolang/jeo/representation/PrefixedName.java

@@ -23,6 +23,8 @@
  */
 package org.eolang.jeo.representation;
 
+import java.util.Arrays;
+import java.util.stream.Collectors;
 import lombok.ToString;
 
 /**
@@ -76,9 +78,9 @@ public String encode() {
         if (this.origin.replace(" ", "").isEmpty()) {
             throw new IllegalArgumentException(PrefixedName.BLANK);
         } else if (this.origin.contains(PrefixedName.DELIMITER)) {
-            final String[] split = this.origin.split(PrefixedName.DELIMITER);
-            split[split.length - 1] = new PrefixedName(split[split.length - 1]).encode();
-            res = String.join(PrefixedName.DELIMITER, split);
+            res = Arrays.stream(this.origin.split(PrefixedName.DELIMITER))
+                .map(each -> String.format("%s%s", PrefixedName.PREFIX, each))
+                .collect(Collectors.joining(PrefixedName.DELIMITER));
         } else {
             res = String.format("%s%s", PrefixedName.PREFIX, this.origin);
         }
@@ -90,18 +92,27 @@ public String encode() {
      * @return Decoded name.
      */
     public String decode() {
-        final String res;
         if (this.origin.replace(" ", "").isEmpty()) {
             throw new IllegalArgumentException(PrefixedName.BLANK);
-        } else if (this.origin.startsWith(PrefixedName.PREFIX)) {
-            res = this.origin.substring(PrefixedName.PREFIX.length());
-        } else if (this.origin.contains(PrefixedName.DELIMITER)) {
-            final String[] split = this.origin.split(PrefixedName.DELIMITER);
-            split[split.length - 1] = new PrefixedName(split[split.length - 1]).decode();
-            res = String.join(PrefixedName.DELIMITER, split);
+        }
+        return Arrays.stream(this.origin.split(PrefixedName.DELIMITER))
+            .map(PrefixedName::cut)
+            .collect(Collectors.joining(PrefixedName.DELIMITER));
+    }
+
+    /**
+     * Cut prefix from prefixed string.
+     * If the passed string doesn't contain prefix, nothing is removed.
+     * @param prefixed Prefixed string.
+     * @return String without prefix.
+     */
+    private static String cut(final String prefixed) {
+        final String result;
+        if (prefixed.startsWith(PrefixedName.PREFIX)) {
+            result = prefixed.substring(PrefixedName.PREFIX.length());
         } else {
-            res = this.origin;
+            result = prefixed;
         }
-        return res;
+        return result;
     }
 }

src/main/java/org/eolang/jeo/representation/directives/DirectivesMetas.java

@@ -26,6 +26,7 @@
 import java.util.Iterator;
 import java.util.concurrent.atomic.AtomicBoolean;
 import org.eolang.jeo.representation.ClassName;
+import org.eolang.jeo.representation.PrefixedName;
 import org.xembly.Directive;
 import org.xembly.Directives;
 
@@ -132,12 +133,29 @@ public Iterator<Directive> iterator() {
             .add("metas")
             .add("meta")
             .add("head").set("package").up()
-            .add("tail").set(this.name.pckg()).up()
-            .add("part").set(this.name.pckg()).up()
+            .add("tail").set(this.pckg()).up()
+            .add("part").set(this.pckg()).up()
             .up()
             .append(opdirs)
             .append(labeldirs)
             .up()
             .iterator();
     }
+
+    /**
+     * Prefixed package name.
+     * We intentionally add prefix to the packages, because sometimes they can be really
+     * strange, <a href="https://github.com/objectionary/jeo-maven-plugin/issues/779">see</a>
+     * @return Prefixed package name.
+     */
+    private String pckg() {
+        final String result;
+        final String original = this.name.pckg();
+        if (original.isEmpty()) {
+            result = "";
+        } else {
+            result = new PrefixedName(original).encode();
+        }
+        return result;
+    }
 }

src/main/java/org/eolang/jeo/representation/xmir/XmlProgram.java

@@ -26,6 +26,7 @@
 import com.jcabi.xml.XML;
 import com.jcabi.xml.XMLDocument;
 import org.eolang.jeo.representation.ClassName;
+import org.eolang.jeo.representation.PrefixedName;
 import org.eolang.jeo.representation.bytecode.BytecodeProgram;
 import org.eolang.jeo.representation.directives.DirectivesClass;
 import org.eolang.jeo.representation.directives.DirectivesMetas;
@@ -140,6 +141,8 @@ private String pckg() {
             .xpath("/program/metas/meta[head='package']/tail/text()")
             .stream()
             .findFirst()
+            .map(PrefixedName::new)
+            .map(PrefixedName::decode)
             .orElse("");
     }
 }

src/test/java/org/eolang/jeo/BachedTranslatorTest.java

@@ -67,7 +67,8 @@ void savesXml(@TempDir final Path temp) throws IOException {
                 .getBytes(StandardCharsets.UTF_8)
         );
         new BachedTranslator(new Disassemble(temp))
-            .apply(Stream.of(new XmirRepresentation(clazz))).collect(Collectors.toList());
+            .apply(Stream.of(new XmirRepresentation(clazz)))
+            .collect(Collectors.toList());
         MatcherAssert.assertThat(
             "XML file was not saved",
             temp.resolve(this.expected).toFile(),

src/test/java/org/eolang/jeo/representation/PrefixedNameTest.java

@@ -42,7 +42,7 @@ final class PrefixedNameTest {
         "ClassName, j$ClassName",
         "someLongName, j$someLongName",
         "j$j, j$j$j",
-        "jeo/xmir/Fake, jeo/xmir/j$Fake"
+        "jeo/xmir/Fake, j$jeo/j$xmir/j$Fake"
     })
     void encodesName(final String origin, final String encoded) {
         MatcherAssert.assertThat(
@@ -59,7 +59,7 @@ void encodesName(final String origin, final String encoded) {
         "j$someLongName, someLongName",
         "j$j$j, j$j",
         "someName, someName",
-        "jeo/xmir/j$Fake, jeo/xmir/Fake"
+        "j$jeo/j$xmir/j$Fake, jeo/xmir/Fake"
     })
     void decodesName(final String encoded, final String origin) {
         MatcherAssert.assertThat(

src/test/java/org/eolang/jeo/representation/XmirRepresentationTest.java

@@ -47,7 +47,7 @@ final class XmirRepresentationTest {
     @Test
     void retrievesName() {
         final String name = "Math";
-        final String expected = "org/eolang/foo/j$Math";
+        final String expected = "j$org/eolang/foo/j$Math";
         final String actual = new XmirRepresentation(
             new BytecodeProgram(
                 "org/eolang/foo",

src/test/java/org/eolang/jeo/representation/directives/DirectivesMetasTest.java

@@ -47,8 +47,8 @@ void createsMetasWithPackage() {
             ).xmlQuietly(),
             Matchers.allOf(
                 XhtmlMatchers.hasXPath("/metas/meta/head[text()='package']"),
-                XhtmlMatchers.hasXPath("/metas/meta/tail[text()='path.to']"),
-                XhtmlMatchers.hasXPath("/metas/meta/part[text()='path.to']")
+                XhtmlMatchers.hasXPath("/metas/meta/tail[text()='j$path.to']"),
+                XhtmlMatchers.hasXPath("/metas/meta/part[text()='j$path.to']")
             )
         );
     }
@@ -94,8 +94,8 @@ void addsNothingExceptPackage() {
             ).xmlQuietly(),
             Matchers.allOf(
                 XhtmlMatchers.hasXPath("/metas/meta/head[text()='package']"),
-                XhtmlMatchers.hasXPath("/metas/meta/tail[text()='path.to']"),
-                XhtmlMatchers.hasXPath("/metas/meta/part[text()='path.to']"),
+                XhtmlMatchers.hasXPath("/metas/meta/tail[text()='j$path.to']"),
+                XhtmlMatchers.hasXPath("/metas/meta/part[text()='j$path.to']"),
                 Matchers.not(
                     XhtmlMatchers.hasXPath("/metas/meta/tail[text()='org.eolang.jeo.label']")
                 ),

src/test/java/org/eolang/jeo/representation/directives/HasClass.java

@@ -84,8 +84,18 @@ public HasClass(final String name) {
      */
     public HasClass inside(final String pckg) {
         this.additional.add("/program/metas/meta/head[text()='package']/text()");
-        this.additional.add(String.format("/program/metas/meta/tail[text()='%s']/text()", pckg));
-        this.additional.add(String.format("/program/metas/meta/part[text()='%s']/text()", pckg));
+        this.additional.add(
+            String.format(
+                "/program/metas/meta/tail[text()='%s']/text()",
+                new PrefixedName(pckg).encode()
+            )
+        );
+        this.additional.add(
+            String.format(
+                "/program/metas/meta/part[text()='%s']/text()",
+                new PrefixedName(pckg).encode()
+            )
+        );
         return this;
     }