Flextype Core: Add ability to work with different types of content #212 #186

- FrontmatterParser implementation

flextype/parsers/FrontmatterParser.php

@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * Flextype (http://flextype.org)
+ * Founded by Sergey Romanenko and maintained Flextype Community.
+ */
+
+namespace Flextype;
+
+use const PHP_EOL;
+use function array_slice;
+use function count;
+use function implode;
+use function ltrim;
+use function preg_split;
+use function trim;
+
+class FrontmatterParser
+{
+    /**
+     * Front matter parser
+     *
+     * @param  string $content Content to parse
+     *
+     * @return array
+     *
+     * @access public
+     */
+    public static function frontMatterParser(string $content) : array
+    {
+        $parts = preg_split('/^[\s\r\n]?---[\s\r\n]?$/sm', PHP_EOL . ltrim($content));
+        if (count($parts) < 3) {
+            return ['matter' => [], 'body' => $content];
+        }
+
+        return ['matter' => trim($parts[1]), 'body' => implode(PHP_EOL . '---' . PHP_EOL, array_slice($parts, 2))];
+    }
+
+    public static function encode($input) : string
+    {
+        return '';
+    }
+
+    public static function decode(string $input)
+    {
+        return self::frontMatterParser($input);
+    }
+}

flextype/parsers/Parser.php

@@ -18,12 +18,9 @@ class Parser
         ], 'yaml' => [
             'name' => 'yaml',
             'ext' => 'yaml',
-        ], 'md' => [
-            'name' => 'md',
+        ], 'frontmatter' => [
+            'name' => 'frontmatter',
             'ext' => 'md',
-        ], 'toml' => [
-            'name' => 'toml',
-            'ext' => 'toml',
         ],
     ];
 
@@ -37,6 +34,10 @@ class Parser
             case 'yaml':
                 return JsonParser::encode($input);
 
+                break;
+            case 'frontmatter':
+                return FrontmatterParser::encode($input);
+
                 break;
             default:
                 // code...
@@ -54,6 +55,10 @@ class Parser
             case 'yaml':
                 return YamlParser::decode($input);
 
+                break;
+            case 'frontmatter':
+                return FrontmatterParser::decode($input);
+
                 break;
             default:
                 // code...