[CLEANUP] Add native return types to parse() (#608)

Author: oliverklee

src/Value/CSSFunction.php

@@ -37,13 +37,11 @@ public function __construct($sName, $aArguments, $sSeparator = ',', $iLineNo = 0
      * @param ParserState $oParserState
      * @param bool $bIgnoreCase
      *
-     * @return CSSFunction
-     *
      * @throws SourceException
      * @throws UnexpectedEOFException
      * @throws UnexpectedTokenException
      */
-    public static function parse(ParserState $oParserState, $bIgnoreCase = false)
+    public static function parse(ParserState $oParserState, $bIgnoreCase = false): CSSFunction
     {
         $mResult = $oParserState->parseIdentifier($bIgnoreCase);
         $oParserState->consume('(');

src/Value/CalcFunction.php

@@ -25,7 +25,7 @@ class CalcFunction extends CSSFunction
      * @throws UnexpectedTokenException
      * @throws UnexpectedEOFException
      */
-    public static function parse(ParserState $oParserState, $bIgnoreCase = false): CalcFunction
+    public static function parse(ParserState $oParserState, $bIgnoreCase = false): CSSFunction
     {
         $aOperators = ['+', '-', '*', '/'];
         $sFunction = $oParserState->parseIdentifier();

src/Value/Color.php

@@ -26,12 +26,10 @@ public function __construct(array $aColor, $iLineNo = 0)
      * @param ParserState $oParserState
      * @param bool $bIgnoreCase
      *
-     * @return Color|CSSFunction
-     *
      * @throws UnexpectedEOFException
      * @throws UnexpectedTokenException
      */
-    public static function parse(ParserState $oParserState, $bIgnoreCase = false)
+    public static function parse(ParserState $oParserState, $bIgnoreCase = false): CSSFunction
     {
         $aColor = [];
         if ($oParserState->comes('#')) {