add doc block parser

src/Processors/DocBlockProcessor.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace AndreasElia\PostmanGenerator\Processors;
+
+use Illuminate\Support\Str;
+use PHPStan\PhpDocParser\Ast\PhpDoc\PhpDocTextNode;
+use PHPStan\PhpDocParser\Lexer\Lexer;
+use PHPStan\PhpDocParser\Parser\ConstExprParser;
+use PHPStan\PhpDocParser\Parser\PhpDocParser;
+use PHPStan\PhpDocParser\Parser\TokenIterator;
+use PHPStan\PhpDocParser\Parser\TypeParser;
+use ReflectionFunction;
+use ReflectionMethod;
+use Throwable;
+
+class DocBlockProcessor
+{
+    public function __invoke(ReflectionMethod|ReflectionFunction $reflectionMethod): string
+    {
+        try {
+            $lexer = new Lexer;
+            $constExprParser = new ConstExprParser;
+            $parser = new PhpDocParser(new TypeParser($constExprParser), $constExprParser);
+
+            $description = '';
+            $comment = $reflectionMethod->getDocComment();
+            $tokens = new TokenIterator($lexer->tokenize($comment));
+            $phpDocNode = $parser->parse($tokens);
+
+            foreach ($phpDocNode->children as $child) {
+                if ($child instanceof PhpDocTextNode) {
+                    $description .= ' '.$child->text;
+                }
+            }
+
+            return Str::squish($description);
+        } catch (Throwable $e) {
+            return '';
+        }
+    }
+}