feat(256): check for inner objects

Author: Marat-Tim

src/main/resources/org/eolang/lints/refs/base-must-be-merged.xsl

@@ -3,14 +3,15 @@
   ~ SPDX-FileCopyrightText: Copyright (c) 2016-2025 Objectionary.com
   ~ SPDX-License-Identifier: MIT
   -->
-<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:eo="https://www.eolang.org" id="base-must-be-merged" version="2.0">
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:eo="https://www.eolang.org" id="base-must-be-merged" version="2.0">
   <xsl:import href="/org/eolang/parser/_funcs.xsl"/>
   <xsl:import href="/org/eolang/funcs/lineno.xsl"/>
   <xsl:import href="/org/eolang/funcs/defect-context.xsl"/>
   <xsl:output encoding="UTF-8" method="xml"/>
   <xsl:template match="/">
     <defects>
       <xsl:for-each select="//o[not(eo:abstract(.)) and parent::o[starts-with(@base, '.')] and not(starts-with(@base, '.')) and not(text())]">
+        <xsl:message select="."/>
         <defect>
           <xsl:variable name="line" select="eo:lineno(@line)"/>
           <xsl:attribute name="line">

src/main/resources/org/eolang/motives/refs/base-must-be-merged.md

@@ -7,14 +7,15 @@ conditions are met:
 2. Attribute `@base` of parent object should start with dot
 3. Attribute `@base` object should not start with dot
 4. Object should not have data
+5. Object should not have inner objects
 
 Incorrect:
 
 ```xml
 <o base=".foo">
-    <o base=".bar">
-        <o base="x"/>
-    </o>
+  <o base=".bar">
+    <o base="x"/>
+  </o>
 </o>
 ```
 
@@ -28,33 +29,35 @@ Correct:
 
 ```xml
 <o base=".foo">
-    <o base=".bar"/>
+  <o base=".bar"/>
 </o>
 ```
 
 Correct:
 
 ```xml
 <o base=".foo">
-    <o/>
+  <o/>
 </o>
 ```
 
 Correct:
 
 ```xml
 <o base=".foo">
-    <o base="bar">
-        A1-B2-C3-D4-E5
-    </o>
+  <o base="bar">
+    A1-B2-C3-D4-E5
+  </o>
 </o>
 ```
 
 Correct:
 
 ```xml
-<o base="foo">
-    <o base=".bar"/>
+<o base=".foo">
+  <o base="bar">
+    <o base="baz"/>
+  </o>
 </o>
 ```
 

src/test/resources/org/eolang/lints/packs/single/base-must-be-merged/no-merge-if-object-has-data.yaml

@@ -9,7 +9,7 @@ document: |
   <object>
     <o base=".foo">
       <o base="bar">
-       A1-B2-C3-D4-E5
+        A1-B2-C3-D4-E5
       </o>
     </o>
   </object>

src/test/resources/org/eolang/lints/packs/single/base-must-be-merged/no-merge-if-object-has-inner-object.yaml

@@ -0,0 +1,15 @@
+# SPDX-FileCopyrightText: Copyright (c) 2016-2025 Objectionary.com
+# SPDX-License-Identifier: MIT
+---
+sheets:
+  - /org/eolang/lints/refs/base-must-be-merged.xsl
+asserts:
+  - /defects[count(defect[@severity='warning'])=0]
+document: |
+  <object>
+    <o base=".foo">
+      <o base="bar">
+        <o base="baz"/>
+      </o>
+    </o>
+  </object>