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Viewing / Editing File: Normalise.php

<?php
/**
 * ----------------------------------------------------------------------
 * 
 * Copyright (c) 2006-2016 Khaled Al-Sham'aa.
 * 
 * http://www.ar-php.org
 * 
 * PHP Version 5 
 * 
 * ----------------------------------------------------------------------
 * 
 * LICENSE
 *
 * This program is open source product; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License (LGPL)
 * 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.gnu.org/licenses/lgpl.txt>.
 * 
 * ----------------------------------------------------------------------
 * 
 * Class Name: Functions to normalise Arabic text.
 * 
 * Filename: Normalise.php
 * 
 * Original Author(s): Khaled Al-Sham'aa <khaled@ar-php.org>
 * 
 * Purpose: Text normalisation through various stages. Also: unshaping. 
 * 
 * ----------------------------------------------------------------------
 * 
 * This class provides various functions to manipulate arabic text and
 * normalise it by applying filters, for example, to strip tatweel and
 * tashkeel, to normalise hamza and lamalephs, and to unshape
 * a joined Arabic text back into its normalised form.
 *
 * There is also a function to reverse a utf8 string.
 *
 * The functions are helpful for searching, indexing and similar 
 * functions.
 *
 * Note that this class can only deal with UTF8 strings. You can use functions
 * from the other classes to convert between encodings if necessary.
 *
 * Example:
 * <code>
 * include('./I18N/Arabic.php');
 * $obj = new I18N_Arabic('Normalise');
 * 
 * $str = "Arabic text with tatweel, tashkeel...";
 * 
 * echo "Before: $str ";
 * 
 * $text = $obj->stripTatweel($str);
 * 
 * echo "After: $text "; 
 * </code> 
 *
 * @category I18N 
 * @package I18N_Arabic
 * @author Djihed Afifi <djihed@gmail.com>
 * @copyright 2006-2016 Khaled Al-Sham'aa
 * 
 * @license LGPL <http://www.gnu.org/licenses/lgpl.txt>
 * @link http://www.ar-php.org 
 */

/**
 * This class provides various functions to manipulate arabic text and
 * normalise it by applying filters, for example, to strip tatweel and
 * tashkeel, to normalise hamza and lamalephs, and to unshape
 * a joined Arabic text back into its normalised form.
 *
 * The functions are helpful for searching, indexing and similar 
 * functions.
 * 
 * @category I18N 
 * @package I18N_Arabic
 * @author Djihed Afifi <djihed@gmail.com>
 * @copyright 2006-2016 Khaled Al-Sham'aa
 * 
 * @license LGPL <http://www.gnu.org/licenses/lgpl.txt>
 * @link http://www.ar-php.org 
 */ 
class I18N_Arabic_Normalise
{
 private $_unshapeMap = array();
 private $_unshapeKeys = array();
 private $_unshapeValues = array();
 private $_chars = array();
 private $_charGroups = array();
 private $_charArNames = array();

/**
      * Load the Unicode constants that will be used ibn substitutions
      * and normalisations.
      *
      * @ignore
      */
    public function __construct() 
    {
        include dirname(__FILE__) . '/data/charset/ArUnicode.constants.php';

$this->_unshapeMap    = $ligature_map;
        $this->_unshapeKeys   = array_keys($this->_unshapeMap);
        $this->_unshapeValues = array_values($this->_unshapeMap);
        $this->_chars         = $char_names;
        $this->_charGroups    = $char_groups;
        $this->_charArNames   = $char_ar_names;
    }

/**
 * Strip all tatweel characters from an Arabic text.
 * 
 * @param string $text The text to be stripped.
 * 
 * @return string the stripped text.
 * @author Djihed Afifi <djihed@gmail.com>
 */ 
 public function stripTatweel($text) 
 {
 return str_replace($this->_chars['TATWEEL'], '', $text); 
 }

/**
 * Strip all tashkeel characters from an Arabic text.
 * 
 * @param string $text The text to be stripped.
 * 
 * @return string the stripped text.
 * @author Djihed Afifi <djihed@gmail.com>
 */ 
 public function stripTashkeel($text) 
 {
 $tashkeel = array(
 $this->_chars['FATHATAN'], 
 $this->_chars['DAMMATAN'], 
 $this->_chars['KASRATAN'], 
 $this->_chars['FATHA'], 
 $this->_chars['DAMMA'], 
 $this->_chars['KASRA'],
 $this->_chars['SUKUN'],
 $this->_chars['SHADDA']
 );
 return str_replace($tashkeel, "", $text);
 }

/**
 * Normalise all Hamza characters to their corresponding aleph 
 * character in an Arabic text.
 *
 * @param string $text The text to be normalised.
 * 
 * @return string the normalised text.
 * @author Djihed Afifi <djihed@gmail.com>
 */ 
 public function normaliseHamza($text) 
 {
 $replace = array(
 $this->_chars['WAW_HAMZA'] = $this->_chars['WAW'],
 $this->_chars['YEH_HAMZA'] = $this->_chars['YEH'],
 );
 $alephs = array(
 $this->_chars['ALEF_MADDA'],
 $this->_chars['ALEF_HAMZA_ABOVE'],
 $this->_chars['ALEF_HAMZA_BELOW'],
 $this->_chars['HAMZA_ABOVE,HAMZA_BELOW']
 );

$text = str_replace(array_keys($replace), array_values($replace), $text);
        $text = str_replace($alephs, $this->_chars['ALEF'], $text);
        return $text;
    }

/**
 * Unicode uses some special characters where the lamaleph and any
 * hamza above them are combined into one code point. Some input
 * system use them. This function expands these characters.
 *
 * @param string $text The text to be normalised.
 * 
 * @return string the normalised text.
 * @author Djihed Afifi <djihed@gmail.com>
 */ 
 public function normaliseLamaleph ($text) 
 {
 $text = str_replace(
 $this->_chars['LAM_ALEPH'], 
 $simple_LAM_ALEPH, 
 $text
 );
 $text = str_replace(
 $this->_chars['LAM_ALEPH_HAMZA_ABOVE'], 
 $simple_LAM_ALEPH_HAMZA_ABOVE, 
 $text
 );
 $text = str_replace(
 $this->_chars['LAM_ALEPH_HAMZA_BELOW'], 
 $simple_LAM_ALEPH_HAMZA_BELOW, 
 $text
 );
 $text = str_replace(
 $this->_chars['LAM_ALEPH_MADDA_ABOVE'], 
 $simple_LAM_ALEPH_MADDA_ABOVE, 
 $text
 );
 return $text;
 }

/**
 * Return unicode char by its code point.
 *
 * @param char $u code point
 * 
 * @return string the result character.
 * @author Djihed Afifi <djihed@gmail.com>
 */
 public function unichr($u) 
 {
 return mb_convert_encoding('&#'.intval($u).';', 'UTF-8', 'HTML-ENTITIES');
 }

/**
 * Takes a string, it applies the various filters in this class
 * to return a unicode normalised string suitable for activities
 * such as searching, indexing, etc.
 *
 * @param string $text the text to be normalised.
 * 
 * @return string the result normalised string.
 * @author Djihed Afifi <djihed@gmail.com>
 */ 
 public function normalise($text)
 {
 $text = $this->stripTashkeel($text);
 $text = $this->stripTatweel($text);
 $text = $this->normaliseHamza($text);
 $text = $this->normaliseLamaleph($text);

return $text;
    }

/**
 * Takes Arabic text in its joined form, it untangles the characters
 * and unshapes them.
 *
 * This can be used to process text that was processed through OCR
 * or by extracting text from a PDF document.
 *
 * Note that the result text may need further processing. In most
 * cases, you will want to use the utf8Strrev function from
 * this class to reverse the string.
 * 
 * Most of the work of setting up the characters for this function
 * is done through the ArUnicode.constants.php constants and 
 * the constructor loading.
 *
 * @param string $text the text to be unshaped.
 * 
 * @return string the result normalised string.
 * @author Djihed Afifi <djihed@gmail.com>
 */
 public function unshape($text)
 {
 return str_replace($this->_unshapeKeys, $this->_unshapeValues, $text);
 }

/**
 * Take a UTF8 string and reverse it.
 *
 * @param string $str the string to be reversed.
 * @param boolean $reverse_numbers whether to reverse numbers.
 * 
 * @return string The reversed string.
 */
 public function utf8Strrev($str, $reverse_numbers = false) 
 {
 preg_match_all('/./us', $str, $ar);
 if ($reverse_numbers) {
 return join('', array_reverse($ar[0]));
 } else {
 $temp = array();
 foreach ($ar[0] as $value) {
 if (is_numeric($value) && !empty($temp[0]) && is_numeric($temp[0])) {
 foreach ($temp as $key => $value2) {
 if (is_numeric($value2)) {
 $pos = ($key + 1);
 } else {
 break;
 }
 }
 $temp2 = array_splice($temp, $pos);
 $temp = array_merge($temp, array($value), $temp2);
 } else {
 array_unshift($temp, $value);
 }
 }
 return implode('', $temp);
 }
 }
 
 /**
 * Checks for Arabic Tashkeel marks (i.e. FATHA, DAMMA, KASRA, SUKUN, 
 * SHADDA, FATHATAN, DAMMATAN, KASRATAN).
 *
 * @param string $archar Arabic unicode char
 * 
 * @return boolean True if it is Arabic Tashkeel mark
 * @author Khaled Al-Sham'aa <khaled@ar-php.org>
 */
 public function isTashkeel($archar)
 {
 $key = array_search($archar, $this->_chars);

if (in_array($key, $this->_charGroups['TASHKEEL'])) {
 $value = true;
 } else {
 $value = false;
 }
 
 return $value;
 }
 
 /**
 * Checks for Arabic Harakat marks (i.e. FATHA, DAMMA, KASRA, SUKUN, TANWIN).
 *
 * @param string $archar Arabic unicode char
 * 
 * @return boolean True if it is Arabic Harakat mark
 * @author Khaled Al-Sham'aa <khaled@ar-php.org>
 */
 public function isHaraka($archar)
 {
 $key = array_search($archar, $this->_chars);

if (in_array($key, $this->_charGroups['HARAKAT'])) {
 $value = true;
 } else {
 $value = false;
 }
 
 return $value;
 }
 
 /**
 * Checks for Arabic short Harakat marks (i.e. FATHA, DAMMA, KASRA, SUKUN).
 *
 * @param string $archar Arabic unicode char
 * 
 * @return boolean True if it is Arabic short Harakat mark
 * @author Khaled Al-Sham'aa <khaled@ar-php.org>
 */
 public function isShortharaka($archar)
 {
 $key = array_search($archar, $this->_chars);

if (in_array($key, $this->_charGroups['SHORTHARAKAT'])) {
 $value = true;
 } else {
 $value = false;
 }
 
 return $value;
 }
 
 /**
 * Checks for Arabic Tanwin marks (i.e. FATHATAN, DAMMATAN, KASRATAN).
 *
 * @param string $archar Arabic unicode char
 * 
 * @return boolean True if it is Arabic Tanwin mark
 * @author Khaled Al-Sham'aa <khaled@ar-php.org>
 */
 public function isTanwin($archar)
 {
 $key = array_search($archar, $this->_chars);

if (in_array($key, $this->_charGroups['TANWIN'])) {
 $value = true;
 } else {
 $value = false;
 }
 
 return $value;
 }
 
 /**
 * Checks for Arabic Ligatures like LamAlef (i.e. LAM ALEF, LAM ALEF HAMZA 
 * ABOVE, LAM ALEF HAMZA BELOW, LAM ALEF MADDA ABOVE).
 *
 * @param string $archar Arabic unicode char
 * 
 * @return boolean True if it is Arabic Ligatures like LamAlef
 * @author Khaled Al-Sham'aa <khaled@ar-php.org>
 */
 public function isLigature($archar)
 {
 $key = array_search($archar, $this->_chars);

if (in_array($key, $this->_charGroups['LIGUATURES'])) {
 $value = true;
 } else {
 $value = false;
 }
 
 return $value;
 }
 
 /**
 * Checks for Arabic Hamza forms (i.e. HAMZA, WAW HAMZA, YEH HAMZA, HAMZA ABOVE, 
 * HAMZA BELOW, ALEF HAMZA BELOW, ALEF HAMZA ABOVE).
 *
 * @param string $archar Arabic unicode char
 * 
 * @return boolean True if it is Arabic Hamza form
 * @author Khaled Al-Sham'aa <khaled@ar-php.org>
 */
 public function isHamza($archar)
 {
 $key = array_search($archar, $this->_chars);

if (in_array($key, $this->_charGroups['HAMZAT'])) {
 $value = true;
 } else {
 $value = false;
 }
 
 return $value;
 }
 
 /**
 * Checks for Arabic Alef forms (i.e. ALEF, ALEF MADDA, ALEF HAMZA ABOVE, 
 * ALEF HAMZA BELOW,ALEF WASLA, ALEF MAKSURA).
 *
 * @param string $archar Arabic unicode char
 * 
 * @return boolean True if it is Arabic Alef form
 * @author Khaled Al-Sham'aa <khaled@ar-php.org>
 */
 public function isAlef($archar)
 {
 $key = array_search($archar, $this->_chars);

if (in_array($key, $this->_charGroups['ALEFAT'])) {
 $value = true;
 } else {
 $value = false;
 }
 
 return $value;
 }
 
 /**
 * Checks for Arabic Weak letters (i.e. ALEF, WAW, YEH, ALEF_MAKSURA).
 *
 * @param string $archar Arabic unicode char
 * 
 * @return boolean True if it is Arabic Weak letter
 * @author Khaled Al-Sham'aa <khaled@ar-php.org>
 */
 public function isWeak($archar)
 {
 $key = array_search($archar, $this->_chars);

if (in_array($key, $this->_charGroups['WEAK'])) {
 $value = true;
 } else {
 $value = false;
 }
 
 return $value;
 }
 
 /**
 * Checks for Arabic Yeh forms (i.e. YEH, YEH HAMZA, SMALL YEH, ALEF MAKSURA).
 *
 * @param string $archar Arabic unicode char
 * 
 * @return boolean True if it is Arabic Yeh form
 * @author Khaled Al-Sham'aa <khaled@ar-php.org>
 */
 public function isYehlike($archar)
 {
 $key = array_search($archar, $this->_chars);

if (in_array($key, $this->_charGroups['YEHLIKE'])) {
 $value = true;
 } else {
 $value = false;
 }
 
 return $value;
 }
 
 /**
 * Checks for Arabic Waw like forms (i.e. WAW, WAW HAMZA, SMALL WAW).
 *
 * @param string $archar Arabic unicode char
 * 
 * @return boolean True if it is Arabic Waw like form
 * @author Khaled Al-Sham'aa <khaled@ar-php.org>
 */
 public function isWawlike($archar)
 {
 $key = array_search($archar, $this->_chars);

if (in_array($key, $this->_charGroups['WAWLIKE'])) {
 $value = true;
 } else {
 $value = false;
 }
 
 return $value;
 }
 
 /**
 * Checks for Arabic Teh forms (i.e. TEH, TEH MARBUTA).
 *
 * @param string $archar Arabic unicode char
 * 
 * @return boolean True if it is Arabic Teh form
 * @author Khaled Al-Sham'aa <khaled@ar-php.org>
 */
 public function isTehlike($archar)
 {
 $key = array_search($archar, $this->_chars);

if (in_array($key, $this->_charGroups['TEHLIKE'])) {
 $value = true;
 } else {
 $value = false;
 }
 
 return $value;
 }
 
 /**
 * Checks for Arabic Small letters (i.e. SMALL ALEF, SMALL WAW, SMALL YEH).
 *
 * @param string $archar Arabic unicode char
 * 
 * @return boolean True if it is Arabic Small letter
 * @author Khaled Al-Sham'aa <khaled@ar-php.org>
 */
 public function isSmall($archar)
 {
 $key = array_search($archar, $this->_chars);

if (in_array($key, $this->_charGroups['SMALL'])) {
 $value = true;
 } else {
 $value = false;
 }
 
 return $value;
 }
 
 /**
 * Checks for Arabic Moon letters.
 *
 * @param string $archar Arabic unicode char
 * 
 * @return boolean True if it is Arabic Moon letter
 * @author Khaled Al-Sham'aa <khaled@ar-php.org>
 */
 public function isMoon($archar)
 {
 $key = array_search($archar, $this->_chars);

if (in_array($key, $this->_charGroups['MOON'])) {
 $value = true;
 } else {
 $value = false;
 }
 
 return $value;
 }
 
 /**
 * Checks for Arabic Sun letters.
 *
 * @param string $archar Arabic unicode char
 * 
 * @return boolean True if it is Arabic Sun letter
 * @author Khaled Al-Sham'aa <khaled@ar-php.org>
 */
 public function isSun($archar)
 {
 $key = array_search($archar, $this->_chars);

if (in_array($key, $this->_charGroups['SUN'])) {
 $value = true;
 } else {
 $value = false;
 }
 
 return $value;
 }
 
 /**
 * Return Arabic letter name in arabic.
 *
 * @param string $archar Arabic unicode char
 * 
 * @return string Arabic letter name in arabic
 * @author Khaled Al-Sham'aa <khaled@ar-php.org>
 */
 public function charName($archar)
 {
 $key = array_search($archar, $this->_chars);

$name = $this->_charArNames["$key"];
        
        return $name;
    }
}

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