From 4742bda9db2a18a9b4d59fe1c3efaf0d73764b00 Mon Sep 17 00:00:00 2001
From: Marat-Tim <rurikcat@gmail.com>
Date: Fri, 9 May 2025 12:52:51 +0300
Subject: [PATCH 1/4] feat(#566): check name match kebab-case

---
 .../lints/names/invalid-name-notation.xsl     | 33 +++++++++++++++++++
 .../motives/names/invalid-name-notation.md    | 23 +++++++++++++
 .../resources/org/eolang/lints/canonical.eo   |  4 +--
 .../allows-good-names.yaml                    | 12 +++++++
 .../catches-invalid-names.yaml                | 15 +++++++++
 5 files changed, 85 insertions(+), 2 deletions(-)
 create mode 100644 src/main/resources/org/eolang/lints/names/invalid-name-notation.xsl
 create mode 100644 src/main/resources/org/eolang/motives/names/invalid-name-notation.md
 create mode 100644 src/test/resources/org/eolang/lints/packs/single/invalid-name-notation/allows-good-names.yaml
 create mode 100644 src/test/resources/org/eolang/lints/packs/single/invalid-name-notation/catches-invalid-names.yaml

diff --git a/src/main/resources/org/eolang/lints/names/invalid-name-notation.xsl b/src/main/resources/org/eolang/lints/names/invalid-name-notation.xsl
new file mode 100644
index 000000000..b87134e04
--- /dev/null
+++ b/src/main/resources/org/eolang/lints/names/invalid-name-notation.xsl
@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ * SPDX-FileCopyrightText: Copyright (c) 2016-2025 Objectionary.com
+ * SPDX-License-Identifier: MIT
+-->
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:eo="https://www.eolang.org" version="2.0" id="phi-is-not-first">
+  <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:variable name="pattern" select="'^[a-z]+(-[a-z]+)*$'"/>
+  <xsl:template match="/">
+    <defects>
+      <xsl:for-each select="//o[@name and not(matches(@name, $pattern))]">
+        <defect>
+          <xsl:variable name="line" select="eo:lineno(@line)"/>
+          <xsl:attribute name="line">
+            <xsl:value-of select="$line"/>
+          </xsl:attribute>
+          <xsl:if test="$line = '0'">
+            <xsl:attribute name="context">
+              <xsl:value-of select="eo:defect-context(.)"/>
+            </xsl:attribute>
+          </xsl:if>
+          <xsl:attribute name="severity">warning</xsl:attribute>
+          <xsl:text>Object name "</xsl:text>
+          <xsl:value-of select="@name"/>
+          <xsl:text>" doesn’t match the regular expression </xsl:text>
+          <xsl:value-of select="$pattern"/>
+        </defect>
+      </xsl:for-each>
+    </defects>
+  </xsl:template>
+</xsl:stylesheet>
diff --git a/src/main/resources/org/eolang/motives/names/invalid-name-notation.md b/src/main/resources/org/eolang/motives/names/invalid-name-notation.md
new file mode 100644
index 000000000..c9006e952
--- /dev/null
+++ b/src/main/resources/org/eolang/motives/names/invalid-name-notation.md
@@ -0,0 +1,23 @@
+# Invalid name notation
+
+The object name must match the regular expression `[a-z]+(-[a-z]+)*`.
+Basically, it should follow kebab-case style,
+but using only Latin letters - no digits or other characters.
+
+Incorrect:
+
+```eo
+# App.
+[] > mainApp
+  foo > x1
+  bar > y_
+```
+
+Correct:
+
+```eo
+# App.
+[] > main-app
+  foo > x
+  bar > y
+```
diff --git a/src/test/resources/org/eolang/lints/canonical.eo b/src/test/resources/org/eolang/lints/canonical.eo
index 523c950db..47b1aa6ae 100644
--- a/src/test/resources/org/eolang/lints/canonical.eo
+++ b/src/test/resources/org/eolang/lints/canonical.eo
@@ -15,8 +15,8 @@
         *
           x.put 2
           while
-            x.as-number.lt 6 > [i1] >>
-            [i] >>
+            x.as-number.lt 6 > [i] >>
+            [j] >>
               seq > @
                 *
                   QQ.io.stdout
diff --git a/src/test/resources/org/eolang/lints/packs/single/invalid-name-notation/allows-good-names.yaml b/src/test/resources/org/eolang/lints/packs/single/invalid-name-notation/allows-good-names.yaml
new file mode 100644
index 000000000..e82abc5f0
--- /dev/null
+++ b/src/test/resources/org/eolang/lints/packs/single/invalid-name-notation/allows-good-names.yaml
@@ -0,0 +1,12 @@
+# SPDX-FileCopyrightText: Copyright (c) 2016-2025 Objectionary.com
+# SPDX-License-Identifier: MIT
+---
+sheets:
+  - /org/eolang/lints/names/invalid-name-notation.xsl
+asserts:
+  - /defects[count(defect[@severity='warning'])=0]
+input: |
+  # App.
+  [] > main-app
+    foo > x
+    bar > y
diff --git a/src/test/resources/org/eolang/lints/packs/single/invalid-name-notation/catches-invalid-names.yaml b/src/test/resources/org/eolang/lints/packs/single/invalid-name-notation/catches-invalid-names.yaml
new file mode 100644
index 000000000..f09196ec6
--- /dev/null
+++ b/src/test/resources/org/eolang/lints/packs/single/invalid-name-notation/catches-invalid-names.yaml
@@ -0,0 +1,15 @@
+# SPDX-FileCopyrightText: Copyright (c) 2016-2025 Objectionary.com
+# SPDX-License-Identifier: MIT
+---
+sheets:
+  - /org/eolang/lints/names/invalid-name-notation.xsl
+asserts:
+  - /defects[count(defect[@severity='warning'])=3]
+  - /defects/defect[@line='2']
+  - /defects/defect[@line='3']
+  - /defects/defect[@line='4']
+input: |
+  # App.
+  [] > mainApp
+    foo > x1
+    bar > y_

From 37a5d500b4a85c9e8dca7e69354bcd4df8802fd5 Mon Sep 17 00:00:00 2001
From: Marat-Tim <rurikcat@gmail.com>
Date: Fri, 9 May 2025 13:43:12 +0300
Subject: [PATCH 2/4] feat(#566): ignore special names

---
 .../resources/org/eolang/funcs/special-name.xsl     | 13 +++++++++++++
 .../eolang/lints/names/invalid-name-notation.xsl    |  5 +++--
 .../invalid-name-notation/allows-special-names.yaml | 12 ++++++++++++
 3 files changed, 28 insertions(+), 2 deletions(-)
 create mode 100644 src/main/resources/org/eolang/funcs/special-name.xsl
 create mode 100644 src/test/resources/org/eolang/lints/packs/single/invalid-name-notation/allows-special-names.yaml

diff --git a/src/main/resources/org/eolang/funcs/special-name.xsl b/src/main/resources/org/eolang/funcs/special-name.xsl
new file mode 100644
index 000000000..28cb59e5d
--- /dev/null
+++ b/src/main/resources/org/eolang/funcs/special-name.xsl
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ SPDX-FileCopyrightText: Copyright (c) 2016-2025 Objectionary.com
+  ~ SPDX-License-Identifier: MIT
+  -->
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:eo="https://www.eolang.org"
+                xmlns:xs="http://www.w3.org/2001/XMLSchema" id="special-name" version="2.0">
+    <xsl:import href="/org/eolang/parser/_specials.xsl"/>
+    <xsl:function name="eo:special" as="xs:boolean">
+        <xsl:param name="name"/>
+        <xsl:sequence select="$name = '@' or $name = $eo:lambda or contains($name, $eo:cactoos)"/>
+    </xsl:function>
+</xsl:stylesheet>
diff --git a/src/main/resources/org/eolang/lints/names/invalid-name-notation.xsl b/src/main/resources/org/eolang/lints/names/invalid-name-notation.xsl
index b87134e04..a6eae13f6 100644
--- a/src/main/resources/org/eolang/lints/names/invalid-name-notation.xsl
+++ b/src/main/resources/org/eolang/lints/names/invalid-name-notation.xsl
@@ -3,14 +3,15 @@
  * SPDX-FileCopyrightText: Copyright (c) 2016-2025 Objectionary.com
  * SPDX-License-Identifier: MIT
 -->
-<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:eo="https://www.eolang.org" version="2.0" id="phi-is-not-first">
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:eo="https://www.eolang.org" version="2.0" id="invalid-name-notation">
   <xsl:import href="/org/eolang/funcs/lineno.xsl"/>
   <xsl:import href="/org/eolang/funcs/defect-context.xsl"/>
+  <xsl:import href="/org/eolang/funcs/special-name.xsl"/>
   <xsl:output encoding="UTF-8" method="xml"/>
   <xsl:variable name="pattern" select="'^[a-z]+(-[a-z]+)*$'"/>
   <xsl:template match="/">
     <defects>
-      <xsl:for-each select="//o[@name and not(matches(@name, $pattern))]">
+      <xsl:for-each select="//o[@name and not(eo:special(@name)) and not(matches(@name, $pattern))]">
         <defect>
           <xsl:variable name="line" select="eo:lineno(@line)"/>
           <xsl:attribute name="line">
diff --git a/src/test/resources/org/eolang/lints/packs/single/invalid-name-notation/allows-special-names.yaml b/src/test/resources/org/eolang/lints/packs/single/invalid-name-notation/allows-special-names.yaml
new file mode 100644
index 000000000..641d5c3ae
--- /dev/null
+++ b/src/test/resources/org/eolang/lints/packs/single/invalid-name-notation/allows-special-names.yaml
@@ -0,0 +1,12 @@
+# SPDX-FileCopyrightText: Copyright (c) 2016-2025 Objectionary.com
+# SPDX-License-Identifier: MIT
+---
+sheets:
+  - /org/eolang/lints/names/invalid-name-notation.xsl
+asserts:
+  - /defects[count(defect[@severity='warning'])=0]
+input: |
+  # App.
+  [] >>
+    foo > @
+      bar ?

From 4621f49f6ee63a77ac18e4cde3e93f25cf66fbd2 Mon Sep 17 00:00:00 2001
From: Marat-Tim <rurikcat@gmail.com>
Date: Fri, 9 May 2025 13:53:10 +0300
Subject: [PATCH 3/4] feat(#566): fix formatting

---
 .../resources/org/eolang/funcs/special-name.xsl     | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/src/main/resources/org/eolang/funcs/special-name.xsl b/src/main/resources/org/eolang/funcs/special-name.xsl
index 28cb59e5d..98d1eaf28 100644
--- a/src/main/resources/org/eolang/funcs/special-name.xsl
+++ b/src/main/resources/org/eolang/funcs/special-name.xsl
@@ -3,11 +3,10 @@
   ~ SPDX-FileCopyrightText: Copyright (c) 2016-2025 Objectionary.com
   ~ SPDX-License-Identifier: MIT
   -->
-<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:eo="https://www.eolang.org"
-                xmlns:xs="http://www.w3.org/2001/XMLSchema" id="special-name" version="2.0">
-    <xsl:import href="/org/eolang/parser/_specials.xsl"/>
-    <xsl:function name="eo:special" as="xs:boolean">
-        <xsl:param name="name"/>
-        <xsl:sequence select="$name = '@' or $name = $eo:lambda or contains($name, $eo:cactoos)"/>
-    </xsl:function>
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:eo="https://www.eolang.org" xmlns:xs="http://www.w3.org/2001/XMLSchema" id="special-name" version="2.0">
+  <xsl:import href="/org/eolang/parser/_specials.xsl"/>
+  <xsl:function name="eo:special" as="xs:boolean">
+    <xsl:param name="name"/>
+    <xsl:sequence select="$name = '@' or $name = $eo:lambda or contains($name, $eo:cactoos)"/>
+  </xsl:function>
 </xsl:stylesheet>

From df45486f3a69122eb07d398f65565dd79d2db2b0 Mon Sep 17 00:00:00 2001
From: Marat-Tim <rurikcat@gmail.com>
Date: Fri, 9 May 2025 14:07:30 +0300
Subject: [PATCH 4/4] feat(#566): fix special names test

---
 .../single/invalid-name-notation/allows-special-names.yaml  | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/test/resources/org/eolang/lints/packs/single/invalid-name-notation/allows-special-names.yaml b/src/test/resources/org/eolang/lints/packs/single/invalid-name-notation/allows-special-names.yaml
index 641d5c3ae..bcab23373 100644
--- a/src/test/resources/org/eolang/lints/packs/single/invalid-name-notation/allows-special-names.yaml
+++ b/src/test/resources/org/eolang/lints/packs/single/invalid-name-notation/allows-special-names.yaml
@@ -7,6 +7,8 @@ asserts:
   - /defects[count(defect[@severity='warning'])=0]
 input: |
   # App.
-  [] >>
+  [] > app
+    x > f
+      [] >>
     foo > @
-      bar ?
+    [] > baz ?