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<?php

namespace Mpdf;

class Hyphenator
{

/**
	 * @var \Mpdf\Mpdf
	 */
	private $mpdf;

private $patterns;

private $dictionary;

private $words;

private $loadedPatterns;

/**
	 * @var bool
	 */
	private $dictionaryLoaded;

public function __construct(Mpdf $mpdf)
	{
		$this->mpdf = $mpdf;

$this->dictionaryLoaded = false;

$this->patterns = [];
		$this->dictionary = [];
		$this->words = [];
	}

/**
	 * @param string $word
	 * @param int $currptr
	 *
	 * @return int
	 */
	public function hyphenateWord($word, $currptr)
	{
		// Do everything inside this function in utf-8
		// Don't hyphenate web addresses
		if (preg_match('/^(http:|www\.)/', $word)) {
			return -1;
		}

$ptr = -1;

if (!$this->dictionaryLoaded) {
			$this->loadDictionary();
		}

if (!in_array($this->mpdf->SHYlang, $this->mpdf->SHYlanguages)) {
			return -1;
		}

// If no pattern loaded or not the best one
		if (!$this->patternsLoaded()) {
			$this->loadPatterns();
		}

if ($this->mpdf->usingCoreFont) {
			$word = mb_convert_encoding($word, 'UTF-8', $this->mpdf->mb_enc);
		}

$prepre = '';
		$postpost = '';
		$startpunctuation = "\xc2\xab\xc2\xbf\xe2\x80\x98\xe2\x80\x9b\xe2\x80\x9c\xe2\x80\x9f";
		$endpunctuation = "\xe2\x80\x9e\xe2\x80\x9d\xe2\x80\x9a\xe2\x80\x99\xc2\xbb";

if (preg_match('/^(["\'' . $startpunctuation . '])+(.{' . $this->mpdf->SHYcharmin . ',})$/u', $word, $m)) {
			$prepre = $m[1];
			$word = $m[2];
		}

if (preg_match('/^(.{' . $this->mpdf->SHYcharmin . ',})([\'\.,;:!?"' . $endpunctuation . ']+)$/u', $word, $m)) {
			$word = $m[1];
			$postpost = $m[2];
		}

if (mb_strlen($word, 'UTF-8') < $this->mpdf->SHYcharmin) {
			return -1;
		}

$success = false;
		$preprelen = mb_strlen($prepre);

if (isset($this->words[mb_strtolower($word)])) {
			foreach ($this->words[mb_strtolower($word)] as $i) {
				if (($i + $preprelen) >= $currptr) {
					break;
				}

$ptr = $i + $preprelen;
				$success = true;
			}
		}

if (!$success) {
			$text_word = '_' . $word . '_';
			$word_length = mb_strlen($text_word, 'UTF-8');
			$text_word = mb_strtolower($text_word, 'UTF-8');
			$hyphenated_word = [];

$numbers = [
				'0' => true,
				'1' => true,
				'2' => true,
				'3' => true,
				'4' => true,
				'5' => true,
				'6' => true,
				'7' => true,
				'8' => true,
				'9' => true
			];

for ($position = 0; $position <= ($word_length - $this->mpdf->SHYcharmin); $position++) {
				$maxwins = min($word_length - $position, $this->mpdf->SHYcharmax);
				for ($win = $this->mpdf->SHYcharmin; $win <= $maxwins; $win++) {
					if (isset($this->patterns[mb_substr($text_word, $position, $win, 'UTF-8')])) {
						$pattern = $this->patterns[mb_substr($text_word, $position, $win, 'UTF-8')];
						$digits = 1;
						$pattern_length = mb_strlen($pattern, 'UTF-8');

for ($i = 0; $i < $pattern_length; $i++) {
							$char = $pattern[$i];
							if (isset($numbers[$char])) {
								$zero = $i === 0 ? $position - 1 : $position + $i - $digits;
								if (!isset($hyphenated_word[$zero]) || $hyphenated_word[$zero] !== $char) {
									$hyphenated_word[$zero] = $char;
								}
								$digits++;
							}
						}
					}
				}
			}

for ($i = $this->mpdf->SHYleftmin; $i <= (mb_strlen($word, 'UTF-8') - $this->mpdf->SHYrightmin); $i++) {
				if (isset($hyphenated_word[$i]) && $hyphenated_word[$i] % 2 !== 0) {
					if (($i + $preprelen) > $currptr) {
						break;
					}
					$ptr = $i + $preprelen;
				}
			}
		}

return $ptr;
	}

private function patternsLoaded()
	{
		return !(count($this->patterns) < 1 || ($this->loadedPatterns && $this->loadedPatterns !== $this->mpdf->SHYlang));
	}

private function loadPatterns()
	{
		$patterns = require __DIR__ . '/../data/patterns/' . $this->mpdf->SHYlang . '.php';
		$patterns = explode(' ', $patterns);

$new_patterns = [];
		$patternCount = count($patterns);
		for ($i = 0; $i < $patternCount; $i++) {
			$value = $patterns[$i];
			$new_patterns[preg_replace('/[0-9]/', '', $value)] = $value;
		}

$this->patterns = $new_patterns;
		$this->loadedPatterns = $this->mpdf->SHYlang;
	}

private function loadDictionary()
	{
		if (file_exists($this->mpdf->hyphenationDictionaryFile)) {
			$this->dictionary = file($this->mpdf->hyphenationDictionaryFile, FILE_SKIP_EMPTY_LINES);
			foreach ($this->dictionary as $entry) {
				$entry = trim($entry);
				$poss = [];
				$offset = 0;
				$p = true;
				$wl = mb_strlen($entry, 'UTF-8');
				while ($offset < $wl) {
					$p = mb_strpos($entry, '/', $offset, 'UTF-8');
					if ($p !== false) {
						$poss[] = $p - count($poss);
					} else {
						break;
					}
					$offset = $p + 1;
				}
				if (count($poss)) {
					$this->words[str_replace('/', '', mb_strtolower($entry))] = $poss;
				}
			}
		} elseif ($this->mpdf->debug) {
			throw new \Mpdf\MpdfException(sprintf('Unable to open hyphenation dictionary "%s"', $this->mpdf->hyphenationDictionaryFile));
		}

$this->dictionaryLoaded = true;
	}
}