Tries to extract parameters from part description and comment.

src/Controller/PartController.php

@@ -53,6 +53,7 @@ use App\Services\Attachments\PartPreviewGenerator;
 use App\Services\LogSystem\EventCommentHelper;
 use App\Services\LogSystem\HistoryHelper;
 use App\Services\LogSystem\TimeTravel;
+use App\Services\Parameters\ParameterExtractor;
 use App\Services\PricedetailHelper;
 use Doctrine\ORM\EntityManagerInterface;
 use Omines\DataTablesBundle\DataTableFactory;
@@ -92,7 +93,7 @@ class PartController extends AbstractController
      * @throws \Exception
      */
     public function show(Part $part, Request $request, TimeTravel $timeTravel, HistoryHelper $historyHelper,
-        DataTableFactory $dataTable, ?string $timestamp = null): Response
+        DataTableFactory $dataTable, ParameterExtractor $parameterExtractor, ?string $timestamp = null): Response
     {
         $this->denyAccessUnlessGranted('read', $part);
 
@@ -133,6 +134,8 @@ class PartController extends AbstractController
                 'pricedetail_helper' => $this->pricedetailHelper,
                 'pictures' => $this->partPreviewGenerator->getPreviewAttachments($part),
                 'timeTravel' => $timeTravel_timestamp,
+                'description_params' => $parameterExtractor->extractParameters($part->getDescription()),
+                'comment_params' => $parameterExtractor->extractParameters($part->getComment())
             ]
         );
     }

src/Services/Parameters/ParameterExtractor.php

@@ -0,0 +1,97 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Services\Parameters;
+
+
+use App\Entity\Parameters\AbstractParameter;
+use App\Entity\Parameters\PartParameter;
+
+class ParameterExtractor
+{
+    protected const ALLOWED_PARAM_SEPARATORS = [", ", "\n"];
+
+    protected const CHAR_LIMIT = 1000;
+
+    /**
+     * Tries to extract parameters from the given string.
+     * Useful for extraction from part description and comment.
+     * @param  string  $input
+     * @param string $class
+     * @return AbstractParameter[]
+     */
+    public function extractParameters(string $input, string $class = PartParameter::class): array
+    {
+        if (!is_a($class, AbstractParameter::class, true)) {
+            throw new \InvalidArgumentException('$class must be a child class of AbstractParameter!');
+        }
+
+        //Restrict search length
+        $input = mb_strimwidth($input,0,self::CHAR_LIMIT);
+
+        $parameters = [];
+
+        //Try to split the input string into different sub strings each containing a single parameter
+        $split = $this->splitString($input);
+        foreach ($split as $param_string) {
+            $tmp = $this->stringToParam($param_string, $class);
+            if ($tmp !== null) {
+                $parameters[] = $tmp;
+            }
+        }
+
+        return $parameters;
+    }
+
+    protected function stringToParam(string $input, string $class): ?AbstractParameter
+    {
+        $input = trim($input);
+        $regex = '/^(.*) *(?:=|:) *(.+)/u';
+
+        $matches = [];
+        \preg_match($regex, $input, $matches);
+        dump($matches);
+        if (!empty($matches)) {
+            [$raw, $name, $value] = $matches;
+            $value = trim($value);
+
+            //Dont allow empty names or values (these are a sign of an invalid extracted string)
+            if (empty($name) || empty($value)) {
+                return null;
+            }
+
+            /** @var AbstractParameter $parameter */
+            $parameter = new $class();
+            $parameter->setName(trim($name));
+            $parameter->setValueText($value);
+
+            return $parameter;
+        }
+
+        return null;
+    }
+
+    protected function splitString(string $input): array
+    {
+        //Allow comma as limiter (include space, to prevent splitting in german style numbers)
+        $input = str_replace(static::ALLOWED_PARAM_SEPARATORS, ";", $input);
+        return explode(";", $input);
+    }
+}