Improve digit handling in CamelCaseToSeparator filter

Author: edigu

src/Word/CamelCaseToSeparator.php

@@ -26,10 +26,18 @@ public function filter($value)
         }
 
         if (StringUtils::hasPcreUnicodeSupport()) {
-            $pattern     = ['#(?<=(?:\p{Lu}))(\p{Lu}\p{Ll})#', '#(?<=(?:\p{Ll}|\p{Nd}))(\p{Lu})#'];
-            $replacement = [$this->separator . '\1', $this->separator . '\1'];
+            /**
+             * First: Match right after a lowercase letter or digit following a capital letter or 
+             * before a capital letter with a lowercese letter on it's right.
+             *
+             * Second: Match right after a lowercase letter following zero or more digits 
+             * or a capital letter
+             */
+            $pattern = ['#(?<=\p{Ll}|\p{Nd})(?=\p{Lu})|(?<=\p{Lu})(?=\p{Lu}\p{Ll})#', '#(?<=(?:\p{Ll}))(\p{Lu}|(\p{Nd}+))#'];
+            $replacement = [ $this->separator . '\1', $this->separator . '\1',
+            ];
         } else {
-            $pattern     = ['#(?<=(?:[A-Z]))([A-Z]+)([A-Z][a-z])#', '#(?<=(?:[a-z0-9]))([A-Z])#'];
+            $pattern     = [ '#(?<=[a-z0-9])(?=[A-Z])|(?<=[A-Z])(?=[A-Z][a-z])#', '#(?<=(?:[a-z]))([A-Z]|([0-9]+))#' ];
             $replacement = ['\1' . $this->separator . '\2', $this->separator . '\1'];
         }
 

test/Word/CamelCaseToDashTest.php

@@ -27,4 +27,31 @@ public function testFilterSeparatesCamelCasedWordsWithDashes()
         $this->assertNotEquals($string, $filtered);
         $this->assertEquals('Camel-Cased-Words', $filtered);
     }
+
+    /**
+     * @dataProvider camelizedStrings
+     */
+    public function testFilterSeparatesCamelCasedWordsContainingNumbersWithDashes($camel, $dashed)
+    {
+        $filter   = new CamelCaseToDashFilter();
+        $filtered = $filter($camel);
+        $this->assertNotEquals($camel, $filtered);
+        $this->assertEquals($dashed, $filtered);
+    }
+
+    /**
+     * Provides CamelizedStrings to test
+     * 
+     * @return array
+     */
+    public function camelizedStrings()
+    {
+        return [
+            [ 'CamelCasedWith2016Numbers', 'Camel-Cased-With-2016-Numbers' ],
+            [ '10NumbersAsPrefix', '10-Numbers-As-Prefix' ],
+            [ 'NumberSuffix42', 'Number-Suffix-42' ],
+            [ 'lower50Upper', 'lower-50-Upper' ],
+            [ 'dashed-2016Bar', 'dashed-2016-Bar'],
+        ];
+    }
 }

test/Word/CamelCaseToUnderscoreTest.php

@@ -42,13 +42,13 @@ public function testFilterSeperatingNumbersToUnterscore()
         $filtered = $filter($string);
 
         $this->assertNotEquals($string, $filtered);
-        $this->assertEquals('Pa2_Title', $filtered);
+        $this->assertEquals('Pa_2_Title', $filtered);
 
         $string = 'Pa2aTitle';
         $filter   = new CamelCaseToUnderscoreFilter();
         $filtered = $filter($string);
 
         $this->assertNotEquals($string, $filtered);
-        $this->assertEquals('Pa2a_Title', $filtered);
+        $this->assertEquals('Pa_2a_Title', $filtered);
     }
 }