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lib/PdfParser/Element.php

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+<?php
+
+/**
+ * @file
+ *          This file is part of the PdfParser library.
+ *
+ * @author  Sébastien MALOT <sebastien@malot.fr>
+ * @date    2017-01-03
+ * @license LGPLv3
+ * @url     <https://github.com/smalot/pdfparser>
+ *
+ *  PdfParser is a pdf library written in PHP, extraction oriented.
+ *  Copyright (C) 2017 - Sébastien MALOT <sebastien@malot.fr>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with this program.
+ *  If not, see <http://www.pdfparser.org/sites/default/LICENSE.txt>.
+ *
+ */
+
+namespace Smalot\PdfParser;
+
+use Smalot\PdfParser\Element\ElementArray;
+use Smalot\PdfParser\Element\ElementBoolean;
+use Smalot\PdfParser\Element\ElementDate;
+use Smalot\PdfParser\Element\ElementHexa;
+use Smalot\PdfParser\Element\ElementName;
+use Smalot\PdfParser\Element\ElementNull;
+use Smalot\PdfParser\Element\ElementNumeric;
+use Smalot\PdfParser\Element\ElementString;
+use Smalot\PdfParser\Element\ElementStruct;
+use Smalot\PdfParser\Element\ElementXRef;
+
+/**
+ * Class Element
+ *
+ * @package Smalot\PdfParser
+ */
+class Element
+{
+    /**
+     * @var Document
+     */
+    protected $document = null;
+
+    /**
+     * @var mixed
+     */
+    protected $value = null;
+
+    /**
+     * @param mixed    $value
+     * @param Document $document
+     */
+    public function __construct($value, Document $document = null)
+    {
+        $this->value    = $value;
+        $this->document = $document;
+    }
+
+    /**
+     *
+     */
+    public function init()
+    {
+
+    }
+
+    /**
+     * @param mixed $value
+     *
+     * @return bool
+     */
+    public function equals($value)
+    {
+        return ($value == $this->value);
+    }
+
+    /**
+     * @param mixed $value
+     *
+     * @return bool
+     */
+    public function contains($value)
+    {
+        if (is_array($this->value)) {
+            /** @var Element $val */
+            foreach ($this->value as $val) {
+                if ($val->equals($value)) {
+                    return true;
+                }
+            }
+
+            return false;
+        } else {
+            return $this->equals($value);
+        }
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getContent()
+    {
+        return $this->value;
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return (string)($this->value);
+    }
+
+    /**
+     * @param string   $content
+     * @param Document $document
+     * @param int      $position
+     *
+     * @return array
+     * @throws \Exception
+     */
+    public static function parse($content, Document $document = null, &$position = 0)
+    {
+        $args        = func_get_args();
+        $only_values = isset($args[3]) ? $args[3] : false;
+        $content     = trim($content);
+        $values      = array();
+
+        do {
+            $old_position = $position;
+
+            if (!$only_values) {
+                if (!preg_match('/^\s*(?P<name>\/[A-Z0-9\._]+)(?P<value>.*)/si', substr($content, $position), $match)) {
+                    break;
+                } else {
+                    $name     = ltrim($match['name'], '/');
+                    $value    = $match['value'];
+                    $position = strpos($content, $value, $position + strlen($match['name']));
+                }
+            } else {
+                $name  = count($values);
+                $value = substr($content, $position);
+            }
+
+            if ($element = ElementName::parse($value, $document, $position)) {
+                $values[$name] = $element;
+            } elseif ($element = ElementXRef::parse($value, $document, $position)) {
+                $values[$name] = $element;
+            } elseif ($element = ElementNumeric::parse($value, $document, $position)) {
+                $values[$name] = $element;
+            } elseif ($element = ElementStruct::parse($value, $document, $position)) {
+                $values[$name] = $element;
+            } elseif ($element = ElementBoolean::parse($value, $document, $position)) {
+                $values[$name] = $element;
+            } elseif ($element = ElementNull::parse($value, $document, $position)) {
+                $values[$name] = $element;
+            } elseif ($element = ElementDate::parse($value, $document, $position)) {
+                $values[$name] = $element;
+            } elseif ($element = ElementString::parse($value, $document, $position)) {
+                $values[$name] = $element;
+            } elseif ($element = ElementHexa::parse($value, $document, $position)) {
+                $values[$name] = $element;
+            } elseif ($element = ElementArray::parse($value, $document, $position)) {
+                $values[$name] = $element;
+            } else {
+                $position = $old_position;
+                break;
+            }
+        } while ($position < strlen($content));
+
+        return $values;
+    }
+}