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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\ElementMissing;
use Smalot\PdfParser\Element\ElementStruct;
use Smalot\PdfParser\Element\ElementXRef;
/**
* Class Header
*/
class Header
{
/**
* @var Document|null
*/
protected $document;
/**
* @var Element[]
*/
protected $elements;
/**
* @param Element[] $elements list of elements
* @param Document $document document
*/
public function __construct(array $elements = [], ?Document $document = null)
{
$this->elements = $elements;
$this->document = $document;
}
public function init()
{
foreach ($this->elements as $element) {
if ($element instanceof Element) {
$element->init();
}
}
}
/**
* Returns all elements.
*/
public function getElements()
{
foreach ($this->elements as $name => $element) {
$this->resolveXRef($name);
}
return $this->elements;
}
/**
* Used only for debug.
*/
public function getElementTypes(): array
{
$types = [];
foreach ($this->elements as $key => $element) {
$types[$key] = \get_class($element);
}
return $types;
}
public function getDetails(bool $deep = true): array
{
$values = [];
$elements = $this->getElements();
foreach ($elements as $key => $element) {
if ($element instanceof self && $deep) {
$values[$key] = $element->getDetails($deep);
} elseif ($element instanceof PDFObject && $deep) {
$values[$key] = $element->getDetails(false);
} elseif ($element instanceof ElementArray) {
if ($deep) {
$values[$key] = $element->getDetails();
}
} elseif ($element instanceof Element) {
$values[$key] = (string) $element;
}
}
return $values;
}
/**
* Indicate if an element name is available in header.
*
* @param string $name the name of the element
*/
public function has(string $name): bool
{
return \array_key_exists($name, $this->elements);
}
/**
* @return Element|PDFObject
*/
public function get(string $name)
{
if (\array_key_exists($name, $this->elements) && $element = $this->resolveXRef($name)) {
return $element;
}
return new ElementMissing();
}
/**
* Resolve XRef to object.
*
* @return Element|PDFObject
*
* @throws \Exception
*/
protected function resolveXRef(string $name)
{
if (($obj = $this->elements[$name]) instanceof ElementXRef && null !== $this->document) {
/** @var ElementXRef $obj */
$object = $this->document->getObjectById($obj->getId());
if (null === $object) {
return new ElementMissing();
}
// Update elements list for future calls.
$this->elements[$name] = $object;
}
return $this->elements[$name];
}
/**
* @param string $content The content to parse
* @param Document $document The document
* @param int $position The new position of the cursor after parsing
*/
public static function parse(string $content, Document $document, int &$position = 0): self
{
/* @var Header $header */
if ('<<' == substr(trim($content), 0, 2)) {
$header = ElementStruct::parse($content, $document, $position);
} else {
$elements = ElementArray::parse($content, $document, $position);
$header = new self([], $document);
if ($elements) {
$header = new self($elements->getRawContent(), null);
}
}
if ($header) {
return $header;
}
// Build an empty header.
return new self([], $document);
}
}
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