<?php

/**
 * Texy! - human-readable text to HTML converter.
 *
 * @copyright  Copyright (c) 2004, 2010 David Grudl
 * @license    GNU GENERAL PUBLIC LICENSE version 2 or 3
 * @link       http://texy.info
 * @package    Texy
 */


/**
 * Long words wrap module.
 *
 * @copyright  Copyright (c) 2004, 2010 David Grudl
 * @package    Texy
 */
final class TexyLongWordsModule extends TexyModule
{
	public $wordLimit = 20;


	const
		DONT = 0,   // don't hyphenate
		HERE = 1,   // hyphenate here
		AFTER = 2;  // hyphenate after


	private $consonants = array(
		'b','c','d','f','g','h','j','k','l','m','n','p','q','r','s','t','v','w','x','z',
		'B','C','D','F','G','H','J','K','L','M','N','P','Q','R','S','T','V','W','X','Z',
		"\xc4\x8d","\xc4\x8f","\xc5\x88","\xc5\x99","\xc5\xa1","\xc5\xa5","\xc5\xbe", //czech utf-8
		"\xc4\x8c","\xc4\x8e","\xc5\x87","\xc5\x98","\xc5\xa0","\xc5\xa4","\xc5\xbd");

	private $vowels = array(
		'a','e','i','o','u','y',
		'A','E','I','O','U','Y',
		"\xc3\xa1","\xc3\xa9","\xc4\x9b","\xc3\xad","\xc3\xb3","\xc3\xba","\xc5\xaf","\xc3\xbd", //czech utf-8
		"\xc3\x81","\xc3\x89","\xc4\x9a","\xc3\x8d","\xc3\x93","\xc3\x9a","\xc5\xae","\xc3\x9d");

	private $before_r = array(
		'b','B','c','C','d','D','f','F','g','G','k','K','p','P','r','R','t','T','v','V',
		"\xc4\x8d","\xc4\x8c","\xc4\x8f","\xc4\x8e","\xc5\x99","\xc5\x98","\xc5\xa5","\xc5\xa4"); //czech utf-8

	private $before_l = array(
		'b','B','c','C','d','D','f','F','g','G','k','K','l','L','p','P','t','T','v','V',
		"\xc4\x8d","\xc4\x8c","\xc4\x8f","\xc4\x8e","\xc5\xa5","\xc5\xa4"); //czech utf-8

	private $before_h = array('c','C','s','S');

	private $doubleVowels = array('a','A','o','O');


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

		$this->consonants = array_flip($this->consonants);
		$this->vowels = array_flip($this->vowels);
		$this->before_r = array_flip($this->before_r);
		$this->before_l = array_flip($this->before_l);
		$this->before_h = array_flip($this->before_h);
		$this->doubleVowels = array_flip($this->doubleVowels);

		$texy->registerPostLine(array($this, 'postLine'), 'longwords');
	}


	public function postLine($text)
	{
		return preg_replace_callback(
			'#[^\ \n\t\x14\x15\x16\x{2013}\x{2014}\x{ad}-]{'.$this->wordLimit.',}#u',
			array($this, 'pattern'),
			$text
		);
	}


	/**
	 * Callback for long words.
	 * (c) David Grudl
	 * @param  array
	 * @return string
	 */
	private function pattern($matches)
	{
		list($mWord) = $matches;
		//    [0] => lllloooonnnnggggwwwoorrdddd

		$chars = array();
		preg_match_all(
			'#['.TEXY_MARK.']+|.#u',
			$mWord,
			$chars
		);

		$chars = $chars[0];
		if (count($chars) < $this->wordLimit) return $mWord;

		$consonants = $this->consonants;
		$vowels = $this->vowels;
		$before_r = $this->before_r;
		$before_l = $this->before_l;
		$before_h = $this->before_h;
		$doubleVowels = $this->doubleVowels;

		$s = array();
		$trans = array();

		$s[] = '';
		$trans[] = -1;
		foreach ($chars as $key => $char) {
			if (ord($char{0}) < 32) continue;
			$s[] = $char;
			$trans[] = $key;
		}
		$s[] = '';
		$len = count($s) - 2;

		$positions = array();
		$a = 0; $last = 1;

		while (++$a < $len) {
			$hyphen = self::DONT; // Do not hyphenate
			do {
				if ($s[$a] === "\xC2\xA0") { $a++; continue 2; } // here and after never

				if ($s[$a] === '.') { $hyphen = self::HERE; break; }

				if (isset($consonants[$s[$a]])) {  // consonants

					if (isset($vowels[$s[$a+1]])) {
						if (isset($vowels[$s[$a-1]])) $hyphen = self::HERE;
						break;
					}

					if (($s[$a] === 's') && ($s[$a-1] === 'n') && isset($consonants[$s[$a+1]])) { $hyphen = self::AFTER; break; }

					if (isset($consonants[$s[$a+1]]) && isset($vowels[$s[$a-1]])) {
						if ($s[$a+1] === 'r') {
							$hyphen = isset($before_r[$s[$a]]) ? self::HERE : self::AFTER;
							break;
						}

						if ($s[$a+1] === 'l') {
							$hyphen = isset($before_l[$s[$a]]) ? self::HERE : self::AFTER;
							break;
						}

						if ($s[$a+1] === 'h') { // CH
							$hyphen = isset($before_h[$s[$a]]) ? self::DONT : self::AFTER;
							break;
						}

						$hyphen = self::AFTER;
						break;
					}

					break;
				}   // end of consonants

				if (($s[$a] === 'u') && isset($doubleVowels[$s[$a-1]])) { $hyphen = self::AFTER; break; }
				if (isset($vowels[$s[$a]]) && isset($vowels[$s[$a-1]])) { $hyphen = self::HERE; break; }

			} while(0);

			if ($hyphen === self::DONT && ($a - $last > $this->wordLimit*0.6)) $positions[] = $last = $a-1; // Hyphenate here
			if ($hyphen === self::HERE) $positions[] = $last = $a-1; // Hyphenate here
			if ($hyphen === self::AFTER) { $positions[] = $last = $a; $a++; } // Hyphenate after

		} // while


		$a = end($positions);
		if (($a === $len-1) && isset($consonants[$s[$len]]))
			array_pop($positions);


		$syllables = array();
		$last = 0;
		foreach ($positions as $pos) {
			if ($pos - $last > $this->wordLimit*0.6) {
				$syllables[] = implode('', array_splice($chars, 0, $trans[$pos] - $trans[$last]));
				$last = $pos;
			}
		}
		$syllables[] = implode('', $chars);

		//$s = implode("\xC2\xAD", $syllables); // insert shy
		//$s = str_replace(array("\xC2\xAD\xC2\xA0", "\xC2\xA0\xC2\xAD"), array(' ', ' '), $s); // shy+nbsp = normal space

		return implode("\xC2\xAD", $syllables);;
	}

}