Add type annotations for Parser

src/Parser.php

@@ -4,9 +4,10 @@
 
 use Sabberworm\CSS\CSSList\Document;
 use Sabberworm\CSS\Parsing\ParserState;
+use Sabberworm\CSS\Parsing\SourceException;
 
 /**
- * Parser class parses CSS from text into a data structure.
+ * This class parses CSS from text into a data structure.
  */
 class Parser
 {
@@ -16,11 +17,9 @@ class Parser
     private $oParserState;
 
     /**
-     * Note that that iLineNo starts from 1 and not 0.
-     *
-     * @param $sText
+     * @param string $sText
      * @param Settings|null $oParserSettings
-     * @param int $iLineNo
+     * @param int $iLineNo the line number (starting from 1, not from 0)
      */
     public function __construct($sText, Settings $oParserSettings = null, $iLineNo = 1)
     {
@@ -30,20 +29,29 @@ public function __construct($sText, Settings $oParserSettings = null, $iLineNo =
         $this->oParserState = new ParserState($sText, $oParserSettings, $iLineNo);
     }
 
+    /**
+     * @param string $sCharset
+     *
+     * @return void
+     */
     public function setCharset($sCharset)
     {
         $this->oParserState->setCharset($sCharset);
     }
 
+    /**
+     * @return void
+     */
     public function getCharset()
     {
+        // Note: The `return` statement is missing here. This is a bug that needs to be fixed.
         $this->oParserState->getCharset();
     }
 
     /**
      * @return Document
      *
-     * @throws Parsing\SourceException
+     * @throws SourceException
      */
     public function parse()
     {