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<?php
/**
* This file is part of PHPWord - A pure PHP library for reading and writing
* word processing documents.
*
* PHPWord is free software distributed under the terms of the GNU Lesser
* General Public License version 3 as published by the Free Software Foundation.
*
* For the full copyright and license information, please read the LICENSE
* file that was distributed with this source code. For the full list of
* contributors, visit https://github.com/PHPOffice/PHPWord/contributors.
*
* @see https://github.com/PHPOffice/PHPWord
* @copyright 2010-2018 PHPWord contributors
* @license http://www.gnu.org/licenses/lgpl.txt LGPL version 3
*/
namespace PhpOffice\PhpWord\Reader\RTF;
use PhpOffice\PhpWord\PhpWord;
use PhpOffice\PhpWord\SimpleType\Jc;
/**
* RTF document reader
*
* References:
* - How to Write an RTF Reader http://latex2rtf.sourceforge.net/rtfspec_45.html
* - PHP rtfclass by Markus Fischer https://github.com/mfn/rtfclass
* - JavaScript RTF-parser by LazyGyu https://github.com/lazygyu/RTF-parser
*
* @since 0.11.0
* @SuppressWarnings(PHPMD.UnusedPrivateMethod)
*/
class Document
{
/** @const int */
const PARA = 'readParagraph';
const STYL = 'readStyle';
const SKIP = 'readSkip';
/**
* PhpWord object
*
* @var \PhpOffice\PhpWord\PhpWord
*/
private $phpWord;
/**
* Section object
*
* @var \PhpOffice\PhpWord\Element\Section
*/
private $section;
/**
* Textrun object
*
* @var \PhpOffice\PhpWord\Element\TextRun
*/
private $textrun;
/**
* RTF content
*
* @var string
*/
public $rtf;
/**
* Content length
*
* @var int
*/
private $length = 0;
/**
* Character index
*
* @var int
*/
private $offset = 0;
/**
* Current control word
*
* @var string
*/
private $control = '';
/**
* Text content
*
* @var string
*/
private $text = '';
/**
* Parsing a control word flag
*
* @var bool
*/
private $isControl = false;
/**
* First character flag: watch out for control symbols
*
* @var bool
*/
private $isFirst = false;
/**
* Group groups
*
* @var array
*/
private $groups = array();
/**
* Parser flags; not used
*
* @var array
*/
private $flags = array();
/**
* Parse RTF content
*
* - Marks controlling characters `{`, `}`, and `\`
* - Removes line endings
* - Builds control words and control symbols
* - Pushes every other character into the text queue
*
* @param \PhpOffice\PhpWord\PhpWord $phpWord
* @todo Use `fread` stream for scalability
*/
public function read(PhpWord $phpWord)
{
$markers = array(
123 => 'markOpening', // {
125 => 'markClosing', // }
92 => 'markBackslash', // \
10 => 'markNewline', // LF
13 => 'markNewline', // CR
);
$this->phpWord = $phpWord;
$this->section = $phpWord->addSection();
$this->textrun = $this->section->addTextRun();
$this->length = strlen($this->rtf);
$this->flags['paragraph'] = true; // Set paragraph flag from the beginning
// Walk each characters
while ($this->offset < $this->length) {
$char = $this->rtf[$this->offset];
$ascii = ord($char);
if (isset($markers[$ascii])) { // Marker found: {, }, \, LF, or CR
$markerFunction = $markers[$ascii];
$this->$markerFunction();
} else {
if (false === $this->isControl) { // Non control word: Push character
$this->pushText($char);
} else {
if (preg_match('/^[a-zA-Z0-9-]?$/', $char)) { // No delimiter: Buffer control
$this->control .= $char;
$this->isFirst = false;
} else { // Delimiter found: Parse buffered control
if ($this->isFirst) {
$this->isFirst = false;
} else {
if (' ' == $char) { // Discard space as a control word delimiter
$this->flushControl(true);
}
}
}
}
}
$this->offset++;
}
$this->flushText();
}
/**
* Mark opening braket `{` character.
*/
private function markOpening()
{
$this->flush(true);
array_push($this->groups, $this->flags);
}
/**
* Mark closing braket `}` character.
*/
private function markClosing()
{
$this->flush(true);
$this->flags = array_pop($this->groups);
}
/**
* Mark backslash `\` character.
*/
private function markBackslash()
{
if ($this->isFirst) {
$this->setControl(false);
$this->text .= '\\';
} else {
$this->flush();
$this->setControl(true);
$this->control = '';
}
}
/**
* Mark newline character: Flush control word because it's not possible to span multiline.
*/
private function markNewline()
{
if ($this->isControl) {
$this->flushControl(true);
}
}
/**
* Flush control word or text.
*
* @param bool $isControl
*/
private function flush($isControl = false)
{
if ($this->isControl) {
$this->flushControl($isControl);
} else {
$this->flushText();
}
}
/**
* Flush control word.
*
* @param bool $isControl
*/
private function flushControl($isControl = false)
{
if (1 === preg_match('/^([A-Za-z]+)(-?[0-9]*) ?$/', $this->control, $match)) {
list(, $control, $parameter) = $match;
$this->parseControl($control, $parameter);
}
if (true === $isControl) {
$this->setControl(false);
}
}
/**
* Flush text in queue.
*/
private function flushText()
{
if ($this->text != '') {
if (isset($this->flags['property'])) { // Set property
$this->flags['value'] = $this->text;
} else { // Set text
if (true === $this->flags['paragraph']) {
$this->flags['paragraph'] = false;
$this->flags['text'] = $this->text;
}
}
// Add text if it's not flagged as skipped
if (!isset($this->flags['skipped'])) {
$this->readText();
}
$this->text = '';
}
}
/**
* Reset control word and first char state.
*
* @param bool $value
*/
private function setControl($value)
{
$this->isControl = $value;
$this->isFirst = $value;
}
/**
* Push text into queue.
*
* @param string $char
*/
private function pushText($char)
{
if ('<' == $char) {
$this->text .= '<';
} elseif ('>' == $char) {
$this->text .= '>';
} else {
$this->text .= $char;
}
}
/**
* Parse control.
*
* @param string $control
* @param string $parameter
*/
private function parseControl($control, $parameter)
{
$controls = array(
'par' => array(self::PARA, 'paragraph', true),
'b' => array(self::STYL, 'font', 'bold', true),
'i' => array(self::STYL, 'font', 'italic', true),
'u' => array(self::STYL, 'font', 'underline', true),
'strike' => array(self::STYL, 'font', 'strikethrough', true),
'fs' => array(self::STYL, 'font', 'size', $parameter),
'qc' => array(self::STYL, 'paragraph', 'alignment', Jc::CENTER),
'sa' => array(self::STYL, 'paragraph', 'spaceAfter', $parameter),
'fonttbl' => array(self::SKIP, 'fonttbl', null),
'colortbl' => array(self::SKIP, 'colortbl', null),
'info' => array(self::SKIP, 'info', null),
'generator' => array(self::SKIP, 'generator', null),
'title' => array(self::SKIP, 'title', null),
'subject' => array(self::SKIP, 'subject', null),
'category' => array(self::SKIP, 'category', null),
'keywords' => array(self::SKIP, 'keywords', null),
'comment' => array(self::SKIP, 'comment', null),
'shppict' => array(self::SKIP, 'pic', null),
'fldinst' => array(self::SKIP, 'link', null),
);
if (isset($controls[$control])) {
list($function) = $controls[$control];
if (method_exists($this, $function)) {
$directives = $controls[$control];
array_shift($directives); // remove the function variable; we won't need it
$this->$function($directives);
}
}
}
/**
* Read paragraph.
*
* @param array $directives
*/
private function readParagraph($directives)
{
list($property, $value) = $directives;
$this->textrun = $this->section->addTextRun();
$this->flags[$property] = $value;
}
/**
* Read style.
*
* @param array $directives
*/
private function readStyle($directives)
{
list($style, $property, $value) = $directives;
$this->flags['styles'][$style][$property] = $value;
}
/**
* Read skip.
*
* @param array $directives
*/
private function readSkip($directives)
{
list($property) = $directives;
$this->flags['property'] = $property;
$this->flags['skipped'] = true;
}
/**
* Read text.
*/
private function readText()
{
$text = $this->textrun->addText($this->text);
if (isset($this->flags['styles']['font'])) {
$text->getFontStyle()->setStyleByArray($this->flags['styles']['font']);
}
}
}