[TASK] Add and implement Positionable interface

CHANGELOG.md

@@ -7,10 +7,29 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 
 ### Added
 
+- Methods `getLineNumber` and `getColumnNumber` which return a nullable `int`
+  for the following classes:
+  `Comment`, `CSSList`, `SourceException`, `Charset`, `CSSNamespace`, `Import`,
+  `Rule`, `DeclarationBlock`, `RuleSet`, `CSSFunction`, `Value` (#1225)
+- `Positionable` interface for CSS items that may have a position
+  (line and perhaps column number) in the parsed CSS (#1221)
+
 ### Changed
 
+- Implement `Positionable` in the following CSS item classes:
+  `Comment`, `CSSList`, `SourceException`, `Charset`, `CSSNamespace`, `Import`,
+  `Rule`, `DeclarationBlock`, `RuleSet`, `CSSFunction`, `Value` (#1225)
+
 ### Deprecated
 
+- `getLineNo()` is deprecated in these classes (use `getLineNumber()` instead):
+  `Comment`, `CSSList`, `SourceException`, `Charset`, `CSSNamespace`, `Import`,
+  `Rule`, `DeclarationBlock`, `RuleSet`, `CSSFunction`, `Value` (#1225, #1233)
+- `Rule::getColNo()` is deprecated (use `getColumnNumber()` instead)
+  (#1225, #1233)
+- Providing zero as the line number argument to `Rule::setPosition()` is
+  deprecated (pass `null` instead if there is no line number) (#1225, #1233)
+
 ### Removed
 
 ### Fixed

composer.json

@@ -27,7 +27,8 @@
         "ext-iconv": "*"
     },
     "require-dev": {
-        "phpunit/phpunit": "5.7.27 || 6.5.14 || 7.5.20 || 8.5.41"
+        "phpunit/phpunit": "5.7.27 || 6.5.14 || 7.5.20 || 8.5.41",
+        "rawr/cross-data-providers": "^2.0.0"
     },
     "suggest": {
         "ext-mbstring": "for parsing UTF-8 CSS"

src/CSSList/CSSList.php

@@ -9,6 +9,8 @@
 use Sabberworm\CSS\Parsing\SourceException;
 use Sabberworm\CSS\Parsing\UnexpectedEOFException;
 use Sabberworm\CSS\Parsing\UnexpectedTokenException;
+use Sabberworm\CSS\Position\Position;
+use Sabberworm\CSS\Position\Positionable;
 use Sabberworm\CSS\Property\AtRule;
 use Sabberworm\CSS\Property\Charset;
 use Sabberworm\CSS\Property\CSSNamespace;
@@ -29,8 +31,10 @@
  *
  * It can also contain `Import` and `Charset` objects stemming from at-rules.
  */
-abstract class CSSList implements Renderable, Commentable
+abstract class CSSList implements Commentable, Positionable, Renderable
 {
+    use Position;
+
     /**
      * @var array<array-key, Comment>
      *
@@ -45,21 +49,14 @@ abstract class CSSList implements Renderable, Commentable
      */
     protected $aContents;
 
-    /**
-     * @var int
-     *
-     * @internal since 8.8.0
-     */
-    protected $iLineNo;
-
     /**
      * @param int $iLineNo
      */
     public function __construct($iLineNo = 0)
     {
         $this->aComments = [];
         $this->aContents = [];
-        $this->iLineNo = $iLineNo;
+        $this->setPosition($iLineNo);
     }
 
     /**
@@ -258,14 +255,6 @@ private static function identifierIs($sIdentifier, $sMatch)
             ?: preg_match("/^(-\\w+-)?$sMatch$/i", $sIdentifier) === 1;
     }
 
-    /**
-     * @return int
-     */
-    public function getLineNo()
-    {
-        return $this->iLineNo;
-    }
-
     /**
      * Prepends an item to the list of contents.
      *

src/Comment/Comment.php

@@ -4,15 +4,12 @@
 
 use Sabberworm\CSS\OutputFormat;
 use Sabberworm\CSS\Renderable;
+use Sabberworm\CSS\Position\Position;
+use Sabberworm\CSS\Position\Positionable;
 
-class Comment implements Renderable
+class Comment implements Positionable, Renderable
 {
-    /**
-     * @var int
-     *
-     * @internal since 8.8.0
-     */
-    protected $iLineNo;
+    use Position;
 
     /**
      * @var string
@@ -28,7 +25,7 @@ class Comment implements Renderable
     public function __construct($sComment = '', $iLineNo = 0)
     {
         $this->sComment = $sComment;
-        $this->iLineNo = $iLineNo;
+        $this->setPosition($iLineNo);
     }
 
     /**
@@ -39,14 +36,6 @@ public function getComment()
         return $this->sComment;
     }
 
-    /**
-     * @return int
-     */
-    public function getLineNo()
-    {
-        return $this->iLineNo;
-    }
-
     /**
      * @param string $sComment
      *

src/Parsing/SourceException.php

@@ -2,31 +2,23 @@
 
 namespace Sabberworm\CSS\Parsing;
 
-class SourceException extends \Exception
+use Sabberworm\CSS\Position\Position;
+use Sabberworm\CSS\Position\Positionable;
+
+class SourceException extends \Exception implements Positionable
 {
-    /**
-     * @var int
-     */
-    private $iLineNo;
+    use Position;
 
     /**
      * @param string $sMessage
      * @param int $iLineNo
      */
     public function __construct($sMessage, $iLineNo = 0)
     {
-        $this->iLineNo = $iLineNo;
+        $this->setPosition($iLineNo);
         if (!empty($iLineNo)) {
             $sMessage .= " [line no: $iLineNo]";
         }
         parent::__construct($sMessage);
     }
-
-    /**
-     * @return int
-     */
-    public function getLineNo()
-    {
-        return $this->iLineNo;
-    }
 }

src/Position/Position.php

@@ -0,0 +1,72 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sabberworm\CSS\Position;
+
+/**
+ * Provides a standard reusable implementation of `Positionable`.
+ *
+ * @internal
+ *
+ * @phpstan-require-implements Positionable
+ */
+trait Position
+{
+    /**
+     * @var int<1, max>|null
+     */
+    protected $lineNumber;
+
+    /**
+     * @var int<0, max>|null
+     */
+    protected $columnNumber;
+
+    /**
+     * @return int<1, max>|null
+     */
+    public function getLineNumber()
+    {
+        return $this->lineNumber;
+    }
+
+    /**
+     * @return int<0, max>
+     */
+    public function getLineNo()
+    {
+        $lineNumber = $this->getLineNumber();
+
+        return $lineNumber !== null ? $lineNumber : 0;
+    }
+
+    /**
+     * @return int<0, max>|null
+     */
+    public function getColumnNumber()
+    {
+        return $this->columnNumber;
+    }
+
+    /**
+     * @return int<0, max>
+     */
+    public function getColNo()
+    {
+        $columnNumber = $this->getColumnNumber();
+
+        return $columnNumber !== null ? $columnNumber : 0;
+    }
+
+    /**
+     * @param int<0, max>|null $lineNumber
+     * @param int<0, max>|null $columnNumber
+     */
+    public function setPosition($lineNumber, $columnNumber = null)
+    {
+        // The conditional is for backwards compatibility (backcompat); `0` will not be allowed in future.
+        $this->lineNumber = $lineNumber !== 0 ? $lineNumber : null;
+        $this->columnNumber = $columnNumber;
+    }
+}

src/Position/Positionable.php

@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sabberworm\CSS\Position;
+
+/**
+ * Represents a CSS item that may have a position in the source CSS document (line number and possibly column number).
+ *
+ * A standard implementation of this interface is available in the `Position` trait.
+ */
+interface Positionable
+{
+    /**
+     * @return int<1, max>|null
+     */
+    public function getLineNumber();
+
+    /**
+     * @return int<0, max>
+     *
+     * @deprecated in version 8.9.0, will be removed in v9.0. Use `getLineNumber()` instead.
+     */
+    public function getLineNo();
+
+    /**
+     * @return int<0, max>|null
+     */
+    public function getColumnNumber();
+
+    /**
+     * @return int<0, max>
+     *
+     * @deprecated in version 8.9.0, will be removed in v9.0. Use `getColumnNumber()` instead.
+     */
+    public function getColNo();
+
+    /**
+     * @param int<0, max>|null $lineNumber
+     *        Providing zero for this parameter is deprecated in version 8.9.0, and will not be supported from v9.0.
+     *        Use `null` instead when no line number is available.
+     * @param int<0, max>|null $columnNumber
+     */
+    public function setPosition($lineNumber, $columnNumber = null);
+}

src/Property/CSSNamespace.php

@@ -4,12 +4,16 @@
 
 use Sabberworm\CSS\Comment\Comment;
 use Sabberworm\CSS\OutputFormat;
+use Sabberworm\CSS\Position\Position;
+use Sabberworm\CSS\Position\Positionable;
 
 /**
  * `CSSNamespace` represents an `@namespace` rule.
  */
-class CSSNamespace implements AtRule
+class CSSNamespace implements AtRule, Positionable
 {
+    use Position;
+
     /**
      * @var string
      */
@@ -41,18 +45,10 @@ public function __construct($mUrl, $sPrefix = null, $iLineNo = 0)
     {
         $this->mUrl = $mUrl;
         $this->sPrefix = $sPrefix;
-        $this->iLineNo = $iLineNo;
+        $this->setPosition($iLineNo);
         $this->aComments = [];
     }
 
-    /**
-     * @return int
-     */
-    public function getLineNo()
-    {
-        return $this->iLineNo;
-    }
-
     /**
      * @return string
      *

src/Property/Charset.php

@@ -4,6 +4,8 @@
 
 use Sabberworm\CSS\Comment\Comment;
 use Sabberworm\CSS\OutputFormat;
+use Sabberworm\CSS\Position\Position;
+use Sabberworm\CSS\Position\Positionable;
 use Sabberworm\CSS\Value\CSSString;
 
 /**
@@ -14,8 +16,10 @@
  * - May only appear at the very top of a Document’s contents.
  * - Must not appear more than once.
  */
-class Charset implements AtRule
+class Charset implements AtRule, Positionable
 {
+    use Position;
+
     /**
      * @var CSSString
      */
@@ -42,18 +46,10 @@ class Charset implements AtRule
     public function __construct(CSSString $oCharset, $iLineNo = 0)
     {
         $this->oCharset = $oCharset;
-        $this->iLineNo = $iLineNo;
+        $this->setPosition($iLineNo);
         $this->aComments = [];
     }
 
-    /**
-     * @return int
-     */
-    public function getLineNo()
-    {
-        return $this->iLineNo;
-    }
-
     /**
      * @param string|CSSString $oCharset
      *