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6bd8ee861c
Summary: Ref T7785. Makes Figlet available without installing the `figlet` package. The PEAR Text_Figlet code is really sketchy and includes this API, which is quite marvelous: ``` function loadFont($filename, $loadgerman = true) ``` At some point, this should probably be rewritten into a modern style, but it's not trivial since the figlet file format and rendering engine are somewhat complicated. I made some adjustments: - Broke the dependency on the PEAR core. - Prevented it from doing any wrong HTML escaping. - Looked through it for any glaring security or correctness problems. This code isn't very pretty or modern, but as far as I can tell it's safe and does render Figlet fonts in a reasonable way. Test Plan: {F803268} Reviewers: chad Reviewed By: chad Maniphest Tasks: T9408, T7785 Differential Revision: https://secure.phabricator.com/D14102
500 lines
14 KiB
PHP
500 lines
14 KiB
PHP
<?php
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/* vim: set expandtab tabstop=4 softtabstop=4 shiftwidth=4: */
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/**
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* ASCII art text creation
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*
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* Project home page (Russian): http://bolknote.ru/files/figlet/
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*
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* PHP Version 4
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*
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* @category Text
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* @package Text_Figlet
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* @author Evgeny Stepanischev <imbolk@gmail.com>
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* @author Christian Weiske <cweiske@php.net>
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* @license http://www.php.net/license PHP License
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* @version CVS: $Id$
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* @link http://pear.php.net/package/Text_Figlet
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*/
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/**
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* ASCII art text creation
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*
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* Project home page (Russian): http://bolknote.ru/files/figlet/
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*
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* PHP Version 4
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*
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* @category Text
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* @package Text_Figlet
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* @author Evgeny Stepanischev <imbolk@gmail.com>
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* @author Christian Weiske <cweiske@php.net>
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* @license http://www.php.net/license PHP License
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* @link http://pear.php.net/package/Text_Figlet
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*/
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class Text_Figlet
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{
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/**
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* Height of a letter
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*
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* @var integer
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*
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* @access protected
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*/
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var $height;
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/**
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* Letter baseline
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*
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* @var integer
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*
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* @access protected
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*/
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var $oldlayout;
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/**
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* Flag - RTL (right to left) or LTR (left to right) text direction
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*
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* @var integer
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*
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* @access protected
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*/
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var $rtol;
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/**
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* Information about special 'hardblank' character
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*
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* @var integer
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*
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* @access protected
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*/
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var $hardblank;
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/**
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* Is used for keeping font
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*
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* @var array
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*
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* @access protected
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*/
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var $font;
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/**
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* Flag is true if smushing occured in letters printing cycle
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*
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* @var integer
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*
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* @access protected
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*/
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var $smush_flag;
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/**
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* Comment lines buffer
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*
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* @var string
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*
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* @access public
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*/
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var $font_comment;
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/**
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* Load user font. Must be invoked first.
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* Automatically tries the Text_Figlet font data directory
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* as long as no path separator is in the filename.
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*
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* @param string $filename font file name
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* @param bool $loadgerman (optional) load German character set or not
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*
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* @access public
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* @return mixed PEAR_Error or true for success
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*/
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function loadFont($filename, $loadgerman = true)
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{
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$this->font = array();
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if (!file_exists($filename)) {
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return self::raiseError('Figlet font file "'
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. $filename
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. '" cannot be found', 1);
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}
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$this->font_comment = '';
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// If Gzip compressed font
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if (substr($filename, -3, 3) == '.gz') {
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$filename = 'compress.zlib://' . $filename;
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$compressed = true;
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if (!function_exists('gzcompress')) {
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return self::raiseError('Cannot load gzip compressed fonts since'
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. ' gzcompress() is not available.',
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3);
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}
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} else {
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$compressed = false;
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}
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if (!($fp = fopen($filename, 'rb'))) {
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return self::raiseError('Cannot open figlet font file ' . $filename, 2);
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}
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if (!$compressed) {
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/* ZIPed font */
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if (fread($fp, 2) == 'PK') {
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if (!function_exists('zip_open')) {
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return self::raiseError('Cannot load ZIP compressed fonts since'
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. ' ZIP PHP extension is not available.',
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5);
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}
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fclose($fp);
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if (!($fp = zip_open($filename))) {
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return self::raiseError('Cannot open figlet font file ' . $filename, 2);
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}
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$name = zip_entry_name(zip_read($fp));
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zip_close($fp);
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if (!($fp = fopen('zip://' . realpath($filename) . '#' . $name, 'rb'))) {
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return self::raiseError('Cannot open figlet font file ' . $filename, 2);
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}
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$compressed = true;
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} else {
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flock($fp, LOCK_SH);
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rewind($fp);
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}
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}
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// flf2a$ 6 5 20 15 3 0 143 229
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// | | | | | | | | | |
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// / / | | | | | | | \
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// Signature / / | | | | | \ Codetag_Count
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// Hardblank / / | | | \ Full_Layout
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// Height / | | \ Print_Direction
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// Baseline / \ Comment_Lines
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// Max_Length Old_Layout
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$header = explode(' ', fgets($fp, 2048));
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if (substr($header[0], 0, 5) <> 'flf2a') {
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return self::raiseError('Unknown FIGlet font format.', 4);
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}
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@list ($this->hardblank, $this->height,,,
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$this->oldlayout, $cmt_count, $this->rtol) = $header;
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$this->hardblank = substr($this->hardblank, -1, 1);
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for ($i = 0; $i < $cmt_count; $i++) {
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$this->font_comment .= fgets($fp, 2048);
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}
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// ASCII charcters
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for ($i = 32; $i < 127; $i++) {
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$this->font[$i] = $this->_char($fp);
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}
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foreach (array(196, 214, 220, 228, 246, 252, 223) as $i) {
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if ($loadgerman) {
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$letter = $this->_char($fp);
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// Invalid character but main font is loaded and I can use it
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if ($letter === false) {
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fclose($fp);
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return true;
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}
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// Load if it is not blank only
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if (trim(implode('', $letter)) <> '') {
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$this->font[$i] = $letter;
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}
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} else {
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$this->_skip($fp);
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}
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}
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// Extented characters
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for ($n = 0; !feof($fp); $n++) {
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list ($i) = explode(' ', rtrim(fgets($fp, 1024)), 2);
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if ($i == '') {
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continue;
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}
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// If comment
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if (preg_match('/^\-0x/i', $i)) {
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$this->_skip($fp);
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} else {
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// If Unicode
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if (preg_match('/^0x/i', $i)) {
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$i = hexdec(substr($i, 2));
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} else {
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// If octal
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if ($i{0} === '0' && $i !== '0' || substr($i, 0, 2) == '-0') {
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$i = octdec($i);
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}
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}
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$letter = $this->_char($fp);
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// Invalid character but main font is loaded and I can use it
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if ($letter === false) {
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fclose($fp);
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return true;
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}
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$this->font[$i] = $letter;
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}
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}
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fclose($fp);
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return true;
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}
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/**
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* Print string using font loaded by LoadFont method
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*
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* @param string $str string for printing
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* @param bool $inhtml (optional) output mode
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* - HTML (true) or plain text (false)
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*
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* @access public
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* @return string contains
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*/
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function lineEcho($str, $inhtml = false)
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{
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$out = array();
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for ($i = 0; $i<strlen($str); $i++) {
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// Pseudo Unicode support
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if (substr($str, $i, 2) == '%u') {
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$lt = hexdec(substr($str, $i+2, 4));
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$i += 5;
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} else {
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$lt = ord($str{$i});
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}
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$hb = preg_quote($this->hardblank, '/');
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$sp = "$hb\\x00\\s";
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// If chosen character not found try to use default
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// If default character is not defined skip it
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if (!isset($this->font[$lt])) {
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if (isset($this->font[0])) {
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$lt = 0;
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} else {
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continue;
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}
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}
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for ($j = 0; $j < $this->height; $j++) {
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$line = $this->font[$lt][$j];
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// Replace hardblanks
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if (isset($out[$j])) {
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if ($this->rtol) {
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$out[$j] = $line . $out[$j];
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} else {
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$out[$j] .= $line;
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}
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} else {
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$out[$j] = $line;
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}
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}
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if ($this->oldlayout > -1 && $i) {
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// Calculate minimal distance between two last letters
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$mindiff = -1;
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for ($j = 0; $j < $this->height; $j++) {
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if (preg_match("/\S(\s*\\x00\s*)\S/", $out[$j], $r)) {
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if ($mindiff == -1) {
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$mindiff = strlen($r[1]);
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} else {
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$mindiff = min($mindiff, strlen($r[1]));
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}
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}
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}
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// Remove spaces between two last letter
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// dec mindiff for exclude \x00 symbol
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if (--$mindiff > 0) {
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for ($j = 0; $j < $this->height; $j++) {
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if (preg_match("/\\x00(\s{0,{$mindiff}})/", $out[$j], $r)) {
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$l = strlen($r[1]);
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$b = $mindiff - $l;
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$out[$j] = preg_replace("/\s{0,$b}\\x00\s{{$l}}/",
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"\0",
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$out[$j],
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1);
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}
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}
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}
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// Smushing
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$this->smush_flag = 0;
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for ($j = 0; $j < $this->height; $j++) {
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$out[$j] = preg_replace_callback("#([^$sp])\\x00([^$sp])#",
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array(&$this, '_rep'),
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$out[$j]);
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}
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// Remove one space if smushing
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// and remove all \x00 except tail whenever
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if ($this->smush_flag) {
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$pat = array("/\s\\x00(?!$)|\\x00\s/", "/\\x00(?!$)/");
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$rep = array('', '');
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} else {
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$pat = "/\\x00(?!$)/";
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$rep = '';
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}
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for ($j = 0; $j<$this->height; $j++) {
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$out[$j] = preg_replace($pat, $rep, $out[$j]);
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}
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}
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}
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$trans = array("\0" => '', $this->hardblank => ' ');
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$str = strtr(implode("\n", $out), $trans);
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if ($inhtml) {
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self::raiseError(
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'Do not use the HTML escaping provided by this class in '.
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'a Phabricator context.');
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}
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return $str;
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}
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/**
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* It is preg_replace callback function that makes horizontal letter smushing
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*
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* @param array $r preg_replace matches array
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*
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* @return string
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* @access private
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*/
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function _rep($r)
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{
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if ($this->oldlayout & 1 && $r[1] == $r[2]) {
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$this->smush_flag = 1;
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return $r[1];
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}
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if ($this->oldlayout & 2) {
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$symb = '|/\\[]{}()<>';
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if ($r[1] == '_' && strpos($symb, $r[2]) !== false ||
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$r[2] == '_' && strpos($symb, $r[1]) !== false) {
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$this->smush_flag = 1;
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return $r[1];
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}
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}
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if ($this->oldlayout & 4) {
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$classes = '|/\\[]{}()<>';
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if (($left = strpos($classes, $r[1])) !== false) {
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if (($right = strpos($classes, $r[2])) !== false) {
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$this->smush_flag = 1;
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return $right > $left ? $r[2] : $r[1];
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}
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}
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}
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if ($this->oldlayout & 8) {
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$t = array('[' => ']', ']' => '[', '{' => '}', '}' => '{',
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'(' => ')', ')' => '(');
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if (isset($t[$r[2]]) && $r[1] == $t[$r[2]]) {
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$this->smush_flag = 1;
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return '|';
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}
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}
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if ($this->oldlayout & 16) {
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$t = array("/\\" => '|', "\\/" => 'Y', '><' => 'X');
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if (isset($t[$r[1].$r[2]])) {
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$this->smush_flag = 1;
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return $t[$r[1].$r[2]];
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}
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}
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if ($this->oldlayout & 32) {
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if ($r[1] == $r[2] && $r[1] == $this->hardblank) {
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$this->smush_flag = 1;
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return $this->hardblank;
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}
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}
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return $r[1]."\00".$r[2];
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}
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/**
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* Function loads one character in the internal array from file
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*
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* @param resource &$fp handle of font file
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*
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* @return mixed lines of the character or false if foef occured
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* @access private
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*/
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function _char(&$fp)
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{
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$out = array();
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for ($i = 0; $i < $this->height; $i++) {
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if (feof($fp)) {
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return false;
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}
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$line = rtrim(fgets($fp, 2048), "\r\n");
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if (preg_match('/(.){1,2}$/', $line, $r)) {
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$line = str_replace($r[1], '', $line);
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}
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$line .= "\x00";
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$out[] = $line;
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}
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return $out;
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}
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/**
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* Function for skipping one character in a font file
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*
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* @param resource &$fp handle of font file
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*
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* @return boolean always return true
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* @access private
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*/
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function _skip(&$fp)
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{
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for ($i = 0; $i<$this->height && !feof($fp); $i++) {
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fgets($fp, 2048);
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}
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return true;
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}
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private static function raiseError($message, $code = 1) {
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throw new Exception($message);
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}
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}
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