<?php
// (c) Copyright 2002-2016 by authors of the Tiki Wiki CMS Groupware Project
// 
// All Rights Reserved. See copyright.txt for details and a complete list of authors.
// Licensed under the GNU LESSER GENERAL PUBLIC LICENSE. See license.txt for details.
// $Id: SentenceAlignments.php 57971 2016-03-17 20:09:05Z jonnybradley $

/**
 * Class used to store aligned bilingual sentences for two different
 * linguistic versions of a same document. For example, English
 * sentences with their corresponding French sentences.
 */
include_once "SentenceSegmentor.php";

class Multilingual_Aligner_SentenceAlignments
{
	protected $alignment_table = array();
	protected $l1 = "en";
	protected $l2 = "fr";

	public function addSentencePair($lng1_sentence, $lng1, $lng2_sentence, $lng2)
	{
		if ( $lng1 == $this->l1 ) {
			$this->alignment_table[$lng1_sentence] = $lng2_sentence;
		} else if ($lng2==$this->l1) {
			$this->alignment_table[$lng2_sentence] = $lng1_sentence;
		}	
	}

	public function getSentenceInOtherLanguage($source_lng_sentence, $source_lng, $key_value, $sentence_array, $index)
	{
		$segmentor = new Multilingual_Aligner_SentenceSegmentor();

		if ($source_lng == $this->l1) {
			$k = 1;
		} else if ($source_lng == $this->l2) {
			$k = 0;
		}

		foreach ($this->alignment_table as $key=>$val) {
			if ($k == 1) {
				$sentences = $segmentor->segment(trim($key));
				if (strcmp(trim($sentences[0]), trim($source_lng_sentence)) == 0) { //if one of those is matched
					$found = 1;
					for ($j=1, $l=1, $count_sentences = count($sentences); $j<$count_sentences; $l++) {
						$flag=0;
						if (($l + $index) >= count($sentence_array)) {
							$found = 0;
							break;
						}

						if (strcmp(trim($sentence_array[$index+$l]), trim($sentences[$j])) != 0) {
							if ($sentence_array[$index+$l] == "" || $sentence_array[$index+$l][0] != "+") { //if it is an added sentence
								$found=0;
								break;
							} else {
								$flag=1;
							}
						}//if

						if ($flag==0)
							$j++;
					} //for

					if ($found == 1) {
						$key_value = $key;
						$array = array($key, $val);
						return $array;
					} //if
				} //if
			} else {	
				$sentences = $segmentor->segment(trim($val));
				if (strcmp(trim($sentences[0]), trim($source_lng_sentence)) == 0) { //if one of those is matched
					$found = 1;
					for ($j=$i+1, $l=1, $count_sentences = count($sentences); $j<$count_sentences; $l++) {
						$flag=0;
						if (($l +$index)>=count($sentence_array)) {
							$found = 0;
							break;
						}

						if (strcmp(trim($sentence_array[$index+$l]), trim($sentences[$j])) != 0) {
							if ($sentence_array[$index+$l] == "" || $sentence_array[$index+$l][0] != "+") { //if it is an added sentence
								$found = 0;
								break;
							} else {
									$flag=1;
							}
						}//if

						if ($flag == 0)
							$j++;
					}//for

					if ($found == 1) {
						$key_value = $val;
						$array = array($val, $key);
						return $array;
					} //if
				} //if
			}	//else
		} //foreach

		if ($k == 1) {
			$times=0;
			$i = -1;
			$temp1 = "NULL";
			$temp2 = "NULL";
			$index1 = $index;
			$start = 0;
			$value = "";
			$found = 0;

			foreach ($this->alignment_table as $key=>$val) {
				$start++;
				$sent_ind = 0;
				$sentences = $segmentor->segment(trim($key));
				for ($j=0, $count_sentences = count($sentences); $j<$count_sentences; $j++) {
					$sentences[$j] = trim($sentences[$j]);
				}

				while (1) {
					$found = 0;

					if ($temp1 == "NULL" && $sent_ind<count($sentences)) {
						$temp1 = $sentences[$sent_ind];
						$sent_ind++;
					}

					if ($temp2 == "NULL") {
						$temp2 = $source_lng_sentence;
						$index1;
					}

					$temp1 = trim($temp1);
					$temp2 = trim($temp2);

					if (($c = $this->strpos_function($temp1, $temp2)) != -1 && $c ==0) {
						$found = 1;
						if (strlen($temp1) == strlen($temp2) && $sent_ind == count($sentences)) {
							for ($u=0; $u < $start; $u++) { //return key and val
								prev($this->alignment_table);
							}
							$d = key($this->alignment_table);
							$key_value = $key_value.$d;
							$value = $value.current($this->alignment_table);
							for ($u=0; $u<$start-1; $u++) { //return key and val
								next($this->alignment_table);
								$d = key($this->alignment_table);

								$key_value = $key_value.$d;
								$value = $value.current($this->alignment_table);
							}
							$array = array($key_value, $value, $dummy);
							$start = 0;
							return $array;
						}

						$temp1 = substr($temp1, strlen($temp2));
						if ($temp1 == "")
							$temp1 = "NULL";

						while (($index1+1) < count($sentence_array)) {
							if ($sentence_array[$index1+1] == "" || $sentence_array[$index1+1][0] != "+") {
								$temp2 = $sentence_array[$index1 + 1];
								$index1++;
								break;
							} //if
							$index1++;
						} //while
						continue;

					} else if (($c=$this->strpos_function($temp2, $temp1)) != -1 && $c == 0) {		
						$found = 1;

						if (strlen($temp1) == strlen($temp2) && $sent_ind == count($sentences)) {
							for ($u=0; $u<$start; $u++) { //return key and val
								prev($this->alignment_table);
							}
							$d = key($this->alignment_table);

							$key_value = $key_value.$d;
							$value = $value.current($this->alignment_table);
							for ($u=0; $u<$start-1; $u++) { //return key and val
								next($this->alignment_table);
								$key_value = $key_value.key($this->alignment_table);
								$value = $value.current($this->alignment_table);
							}
							$array = array($key_value, $value, $dummy);
							$start = 0;
							return $array;
						}

						$temp2 = substr($temp2, strlen($temp1));
						if ($sent_ind>=count($sentences)) {
							$temp1 = "NULL";
							break;
						} else {
							$temp1 = $sentences[$sent_ind];
							$sent_ind++;
						}
					}//if strpos_function($sentence[0],$source_lng_sentence)

					if ($found == 0) {
						$start = 0;
						$value = "";
						break;
					}//if
				}//while

				if ($found == 0) {
					$temp1 = "NULL";
					$temp2 = "NULL";
					$index1 = $index;
				}
			}//foreach		

		} else { //if $k
			$times = 0;
			$i = -1;
			$temp1 = "NULL";
			$temp2 = "NULL";
			$index1 = $index;
			$start = 0;
			$value = "";
			$found = 0;

			foreach ($this->alignment_table as $key=>$val) {
				$start++;
				$sent_ind = 0;
				$sentences = $segmentor->segment(trim($val));
				for ($j=0, $count_sentences = count($sentences); $j<$count_sentences; $j++) {
					$sentences[$j] = trim($sentences[$j]);
				}

				while (1) {
					$found=0;

					if ($temp1 == "NULL" && $sent_ind < count($sentences)) {
						$temp1 = $sentences[$sent_ind];
						$sent_ind++;
					}

					if ($temp2 == "NULL") {
						$temp2 = $source_lng_sentence;
						$index1;
					}

					$temp1 = trim($temp1);
					$temp2 = trim($temp2);

					if (($c = $this->strpos_function($temp1, $temp2)) != -1 && $c == 0) {
						$found = 1;
						if (strlen($temp1) == strlen($temp2) && $sent_ind == count($sentences)) {
							for ($u=0; $u < $start; $u++) {//return key and val
								prev($this->alignment_table);
							}

							$d = current($this->alignment_table);
							$key_value = $key_value.$d;
							$value = $value.key($this->alignment_table);
							for ($u=0; $u < $start-1; $u++) { //return key and val
								next($this->alignment_table);
								$d = current($this->alignment_table);
								$key_value = $key_value.$d;
								$value = $value.key($this->alignment_table);
							}

							$array = array($key_value, $value, $dummy);
							$start = 0;
							return $array;
						}

						$temp1 = substr($temp1, strlen($temp2));
						if ($temp1 == "")
							$temp1 = "NULL";

						while (($index1+1) < count($sentence_array)) {
							if ($sentence_array[$index1+1] == "" || $sentence_array[$index1+1][0] != "+") {
								$temp2 = $sentence_array[$index1+1];
								$index1++;
								break;
							}//if
							$index1++;
						}//while
						continue;

					} else if (($c=$this->strpos_function($temp2, $temp1))!=-1 && $c ==0) {		
						$found = 1;
						if (strlen($temp1) == strlen($temp2) && $sent_ind == count($sentences)) {
							for ($u=0; $u<$start; $u++) { //return key and val
								prev($this->alignment_table);
							}

							$d = current($this->alignment_table);

							$key_value = $key_value.$d;
							$value = $value.key($this->alignment_table);
							for ($u=0; $u<$start-1; $u++) { //return key and val
								next($this->alignment_table);
								$key_value = $key_value.current($this->alignment_table);
								$value = $value.current($this->alignment_table);
							}

							$array = array($key_value, $value,$dummy);
							$start = 0;
							return $array;
						}

						$temp2 = substr($temp2, strlen($temp1));
						if ($sent_ind >= count($sentences)) {
							$temp1 = "NULL";
							break;
						} else {
							$temp1 = $sentences[$sent_ind];
							$sent_ind++;
						}
					}
					if ($found==0) {
						$start = 0;
						$value = "";
						break;
					}
				} //while

				if ($found == 0) {
					$temp1 = "NULL";
					$temp2 = "NULL";
					$index1 = $index;
				}
			} //foreach		

		} //else

		$array = array("", "NULL");
		return $array;
	}

	public function display_alignment_table()
	{
		echo "in func display<br/>";
		foreach ($this->alignment_table as $key=>$val) {
			echo "<-->" . $key . "<--->" . $val . "<--><br/>";
		}
	}

	public function strpos_function($string, $pat)
	{
		if (strlen($string) == 0 && strlen($pat) == 0) {
		 return 0;
		} else if (strlen($string) == 0 || strlen($pat) == 0) {
			return -1;
		}
		$start = 0;
		$lasts = strlen($string)-1;
		$lastp = strlen($pat)-1;
		$endmatch = $lastp;
		$j = 0;

		for ($i=0; $endmatch<=$lasts; $endmatch++, $start++) {
			if ($string[$endmatch] == $pat[$lastp]) {
				for($j=0, $i=$start; $j<$lastp && $string[$i] == $pat[$j]; $i++,$j++);
			}
			if ($j == $lastp)
				return $start;
		}
		return -1;
	}
}
