<?php
// $Id: multibyte.php,v 1.6 2009/05/23 14:57:15 ohwada Exp $

//=========================================================
// webphoto module
// 2008-04-02 K.OHWADA
//=========================================================

//---------------------------------------------------------
// change log
// 2009-05-17 K.OHWADA
// changed build_summary_with_search()
// 2009-01-25 K.OHWADA
// str_replace_continuous_return_code()
// 2009-01-10 K.OHWADA
// build_summary_with_search()
// 2008-06-26 K.OHWADA
// fatal error in rss
//---------------------------------------------------------

if( ! defined( 'XOOPS_TRUST_PATH' ) ) die( 'not permit' ) ;

//=========================================================
// class webphoto_lib_multibyte
//=========================================================
class webphoto_lib_multibyte
{
	var $_is_japanese = false;

	var $_JA_KUTEN   = null;
	var $_JA_DOKUTEN = null;
	var $_JA_PERIOD  = null;
	var $_JA_COMMA   = null;

//---------------------------------------------------------
// constructor
//---------------------------------------------------------
function webphoto_lib_multibyte()
{
	$this->set_internal_encoding( _CHARSET );
}

function &getInstance()
{
	static $instance;
	if (!isset($instance)) {
		$instance = new webphoto_lib_multibyte();
	}
	return $instance;
}

//---------------------------------------------------------
// encoding
//---------------------------------------------------------
function set_internal_encoding( $charset )
{
	if ( function_exists('iconv_get_encoding') && 
	     function_exists('iconv_set_encoding') ) {

		$current = iconv_get_encoding( 'internal_encoding' );
		$ret = iconv_set_encoding( 'internal_encoding', $charset );
		if ( $ret === false ) {
			iconv_set_encoding( 'internal_encoding', $current );
		}
		return $ret;
	}

	if ( function_exists('mb_internal_encoding') ) {

		$current = mb_internal_encoding();
		$ret = mb_internal_encoding( $charset );
		if ( $ret === false ) {
			mb_internal_encoding( $current );
		}
		return $ret;
	}

	return true;	// dummy
}

function i_iconv_get_encoding( $type )
{
	if ( function_exists('iconv_get_encoding') ) {
		return iconv_get_encoding( $type );
	}
	return null;	// dummy
}

function i_iconv_set_encoding( $type, $charset )
{
	if ( function_exists('iconv_set_encoding') ) {
		return iconv_set_encoding( $type, $charset );
	}
	return true;	// dummy
}

function m_mb_internal_encoding( $encoding=null )
{
	if ( function_exists('mb_internal_encoding') ) {
		if ( $encoding ) {
			return mb_internal_encoding( $encoding );
		} else {
			return mb_internal_encoding();
		}
	}
	return true;	// dummy
}

function m_mb_language( $language=null )
{
	if ( function_exists('mb_language') ) {
		if ( $language ) {
			return mb_language( $language );
		} else {
			return mb_language();
		}
	}
}

function m_mb_detect_encoding( $str, $encoding_list=null, $strict=null )
{
	if ( function_exists('mb_detect_encoding') ) {
		if( $encoding_list && $strict ) {
			return mb_detect_encoding( $str, $encoding_list, $strict );
		} elseif( $encoding_list ) {
			return mb_detect_encoding( $str, $encoding_list );
		}
		return mb_detect_encoding( $str );
	}
	return false;
}

function exists_convert_encoding()
{
	if ( function_exists('iconv') ) {
		return true;
	}
	if ( function_exists('mb_convert_encoding') ) {
		return true;
	}
	return false;
}

//---------------------------------------------------------
// convert
//---------------------------------------------------------
function convert_to_utf8( $str, $encoding=_CHARSET )
{
	if ( function_exists('iconv') ) {
		return $this->i_iconv( $encoding, 'UTF-8' , $str );
	}
	if ( function_exists('mb_convert_encoding') ) {
		return mb_convert_encoding( $str, $encoding, 'UTF-8' );
	}
	$str = utf8_encode( $str );
}

function convert_from_utf8( $str, $encoding=_CHARSET )
{
	if ( function_exists('iconv') ) {
		return $this->i_iconv( 'UTF-8', $encoding , $str );
	}
	if ( function_exists('mb_convert_encoding') ) {
		return mb_convert_encoding( $str, 'UTF-8', $encoding );
	}
	$str = utf8_decode($str);
}

function convert_encoding( $str, $to, $from )
{
	if ( $to == $from ) {
		return $str;
	}
	if ( function_exists('iconv') ) {
		return $this->i_iconv( $from, $to, $str );
	}
	if ( function_exists('mb_convert_encoding') ) {
		return mb_convert_encoding( $str, $to, $from );
	}
	return $str;
}

function i_iconv( $from, $to, $str, $extra='//IGNORE' )
{
	if ( function_exists('iconv') ) {
		return iconv( $from, $to.$extra , $str );
	}
	return $str;
}

function m_mb_convert_encoding( $str, $to, $from=null )
{
	if ( function_exists('mb_convert_encoding') ) {
		if ( $from ) {
			return mb_convert_encoding( $str, $to, $from );
		} else {
			return mb_convert_encoding( $str, $to );
		}
	}
	return $str;
}

function convert_space_zen_to_han( $str )
{
	if ( function_exists('mb_convert_kana') ) {
		return mb_convert_kana( $str, 's' );
	}
	return $str;
}

function m_mb_convert_kana( $str, $option="KV", $encoding=null )
{
	if ( function_exists('mb_convert_kana') ){
		if ( $encoding ) {
			return mb_convert_kana( $str, $option, $encoding );
		} else {
			return mb_convert_kana( $str, $option );
		}
	}
	return $str;
}

//---------------------------------------------------------
// strlen
//---------------------------------------------------------
function str_len( $str, $charset=null )
{
	if ( function_exists('iconv_strlen') ) {
		return $this->i_iconv_strlen( $str, $charset );
	}
	if ( function_exists('mb_strlen') ) {
		return $this->m_mb_strlen( $str, $charset );
	}
	return strlen( $str );
}

function i_iconv_strlen( $str, $charset=null )
{
	if ( function_exists('iconv_strlen') ) {
		if ( $charset ) {
			return iconv_strlen( $str, $charset );
		} else {
			return iconv_strlen( $str );
		}
	}
	return strlen( $str );
}

function m_mb_strlen( $str, $encoding=null )
{
	if ( function_exists('mb_strlen') ) {
		if ( $encoding ) {
			return mb_strlen( $str, $encoding );
		} else {
			return mb_strlen( $str );
		}
	}
	return strlen( $str );
}

//---------------------------------------------------------
// strpos
//---------------------------------------------------------
function str_pos( $haystack, $needle, $offset=0, $charset=null )
{
	if ( function_exists('iconv_strpos') ) {
		return $this->i_iconv_strpos( $haystack, $needle, $offset, $charset );
	}
	if ( function_exists('mb_strpos') ) {
		return $this->m_mb_strpos( $haystack, $needle, $offset, $charset );
	}
	return strpos( $haystack, $needle, $offset );
}

function i_iconv_strpos( $haystack, $needle, $offset=0, $charset=null )
{
	if ( function_exists('iconv_strpos') ) {
		if ( $charset ) {
			return iconv_strpos( $haystack, $needle, $offset, $charset );
		} elseif ( $offset ) {
			return iconv_strpos( $haystack, $needle, $offset );
		} else {
			return iconv_strpos( $haystack, $needle );
		}
	}
	return strpos( $haystack, $needle, $offset );
}

function m_mb_strpos( $haystack, $needle, $offset=0, $encoding=null )
{
	if ( function_exists('mb_strpos') ) {
		if ( $encoding ) {
			return mb_strpos( $haystack, $needle, $offset, $encoding );
		} elseif ( $offset ) {
			return mb_strpos( $haystack, $needle, $offset );
		} else {
			return mb_strpos( $haystack, $needle );
		}
	}
	return strpos( $haystack, $needle, $offset );
}

//---------------------------------------------------------
// strrpos
//---------------------------------------------------------
function str_rpos( $haystack, $needle, $offset=0, $charset=null )
{
	if ( function_exists('iconv_strrpos') ) {
		return $this->i_iconv_strrpos( $haystack, $needle, $offset, $charset );
	}
	if ( function_exists('mb_strrpos') ) {
		return $this->m_mb_strrpos( $haystack, $needle, $offset, $charset );
	}
	return strrpos( $haystack, $needle, $offset );
}

function i_iconv_strrpos( $haystack, $needle, $offset=0, $charset=null )
{
	if ( function_exists('iconv_strrpos') ) {
		if ( $charset ) {
			return iconv_strrpos( $haystack, $needle, $offset, $charset );
		} else {
			return iconv_strrpos( $haystack, $needle, $offset );
		}
	}
	return strrpos( $haystack, $needle, $offset );
}

function m_mb_strrpos( $haystack, $needle, $offset=0, $encoding=null )
{
	if ( function_exists('mb_strrpos') ) {
		if ( $encoding ) {
			return mb_strrpos( $haystack, $needle, $offset, $encoding );
		} else {
			return mb_strrpos( $haystack, $needle, $offset );
		}
	}
	return strrpos( $haystack, $needle, $offset );
}

//---------------------------------------------------------
// substr
//---------------------------------------------------------
function sub_str( $str, $start, $length=0, $charset=null )
{
	if ( function_exists('iconv_substr') ) {
		return $this->i_iconv_substr( $str, $start, $length, $charset );
	}
	if ( function_exists('mb_substr') ) {
		return $this->m_mb_substr( $str, $start, $length, $charset );
	}
	return substr( $str, $start, $length );
}

function i_iconv_substr( $str, $start, $length=0, $charset=null )
{
	if ( function_exists('iconv_substr') ) {
		if ( $charset ) {
			return iconv_substr( $str, $start, $length, $charset );
		} else {
			return iconv_substr( $str, $start, $length );
		}
	}
	return substr( $str, $start, $length );
}

function m_mb_substr( $str, $start, $length=0, $encoding=null )
{
	if ( function_exists('mb_substr') ) {
		if ( $encoding ) {
			return mb_substr( $str, $start, $length, $encoding );
		} else {
			return mb_substr( $str, $start, $length );
		}
	}
	return substr( $str, $start, $length );
}

//---------------------------------------------------------
// other
//---------------------------------------------------------
function m_mb_http_output( $encoding=null )
{
	if ( function_exists('mb_http_output') ) {
		if ( $encoding ) {
			return mb_http_output( $encoding );
		} else {
			return mb_http_output();
		}
	}
	return false;
}

function m_mb_send_mail($mailto, $subject, $message, $headers=null, $parameter=null)
{
	if ( function_exists('mb_send_mail') ) {
		if ( $parameter ) {
			return mb_send_mail($mailto, $subject, $message, $headers, $parameter);
		} elseif ( $headers ) {
			return mb_send_mail($mailto, $subject, $message, $headers);
		} else {
			return mb_send_mail($mailto, $subject, $message);
		}
	}
	if ( $parameter ) {
		return mail($mailto, $subject, $message, $headers, $parameter);
	} elseif ( $headers ) {
		return mail($mailto, $subject, $message, $headers);
	}
	return mail($mailto, $subject, $message);
}

function m_mb_ereg_replace( $pattern, $replace, $string, $option=null )
{
	if ( function_exists('mb_ereg_replace') ) {
		if ( $option ) {
			return mb_ereg_replace( $pattern, $replace, $string, $option );
		} else {
			return mb_ereg_replace( $pattern, $replace, $string );
		}
	}
}

//---------------------------------------------------------
// shorten strings
// max: plus=shorten, 0=null, -1=unlimited
//---------------------------------------------------------
function shorten( $str, $max, $tail=' ...' ) 
{
	$text = $str;
	if (( $max > 0 )&&( $this->str_len($str) > $max ) ) {
		$text = $this->sub_str( $str, 0, $max ) . $tail;
	} elseif ( $max == 0 )  {
		$text = null;
	}
	return $text;
}

//---------------------------------------------------------
// build summary
//---------------------------------------------------------
function build_summary( $str, $max, $tail=' ...', $is_japanese=false )
{
	$str = $this->build_plane_text( $str, $is_japanese );
	$str = $this->str_replace_return_code($str);
	$str = $this->str_replace_continuous_space_code($str);
	$str = $this->str_set_empty_if_only_space($str);
	$str = $this->shorten($str, $max, $tail);
	return $str;
}

function build_plane_text( $str, $is_japanese=false )
{
	if ( $is_japanese || $this->_is_japanese ) {
		$str = $this->convert_space_zen_to_han( $str );
		$str = $this->str_add_space_after_punctuation_ja( $str );
	}

	$str = $this->str_add_space_after_tag($str);
	$str = strip_tags($str);
	$str = $this->str_replace_control_code($str);
	$str = $this->str_replace_tab_code($str);
	$str = $this->str_replace_return_to_nl_code( $str );
	$str = $this->str_replace_html_space_code($str);
	$str = $this->str_replace_continuous_space_code($str);
	$str = $this->str_replace_space_return_code($str);
	$str = $this->str_replace_continuous_return_code( $str );
	return $str;
}

function str_add_space_after_tag($str)
{
	return $this->str_add_space_after_str( '>', $str );
}

function str_add_space_after_punctuation($str)
{
	$str = $this->str_add_space_after_str( ',', $str );
	$str = $this->str_add_space_after_str( '.', $str );
	return $str;
}

function str_add_space_after_str( $word, $string )
{
	return str_replace( $word, $word.' ', $string );
}

function str_set_empty_if_only_space($str)
{
	$temp = $this->str_replace_space_code( $str, '' );
	if ( strlen($temp) == 0 ) {
		$str = '';
	}
	return $str;
}

//---------------------------------------------------------
// TAB \x09 \t
// LF  \xOA \n
// CR  \xOD \r
//---------------------------------------------------------
function str_replace_control_code( $str, $replace=' ' )
{
	$str = preg_replace('/[\x00-\x08]/', $replace, $str);
	$str = preg_replace('/[\x0B-\x0C]/', $replace, $str);
	$str = preg_replace('/[\x0E-\x1F]/', $replace, $str);
	$str = preg_replace('/[\x7F]/',      $replace, $str);
	return $str;
}

function str_replace_tab_code( $str, $replace=' ' )
{
	return preg_replace("/\t/", $replace, $str);
}

function str_replace_return_code( $str, $replace=' ' )
{
	$str = preg_replace("/\n/", $replace, $str);
	$str = preg_replace("/\r/", $replace, $str);
	return $str;
}

function str_replace_return_to_nl_code( $str, $replace="\n" )
{
	$str = preg_replace("/\r/", $replace, $str);
	return $str;
}

function str_replace_continuous_return_code( $str, $replace="\n" )
{
	return preg_replace("/[\n|\r]+/", $replace, $str);
}

function str_replace_space_return_code( $str, $replace="\n" )
{
	return preg_replace("/[\x20][\n|\r]/", $replace, $str);
}

function str_replace_html_space_code( $str, $replace=' ' )
{
	return preg_replace("/&nbsp;/i", $replace, $str);
}

function str_replace_space_code( $str, $replace=' ' )
{
	return preg_replace("/[\x20]/", $replace, $str);
}

function str_replace_continuous_space_code( $str, $replace=' ' )
{
	return preg_replace("/[\x20]+/", $replace, $str);
}

//---------------------------------------------------------
// summary
//---------------------------------------------------------
function build_summary_with_search( $text, $words, $len=255, $head='... ', $tail=' ...' )
{
// strip spaces
	$text = ltrim(preg_replace('/\s+/', ' ', $text));

// return full when less than length
	if ( strlen($text) <= $len ) {
		return $text;
	}

// return part from head when no search word
	if ( !is_array($words) ) {
		return $this->sub_str( $text, 0, $len );
	}

// array(aa,bb,cc) -> aa|bb|cc
	$q_word = str_replace(' ', '|', preg_quote(join(' ', $words), '/') );

// return part from head when no match
	if ( ! preg_match( "/$q_word/i", $text, $match ) ) {
		return $this->sub_str( $text, 0, $len );
	}

	$half = intval($len/2);

	$center = $match[0];
	list($left, $right) = preg_split("/$q_word/i", $text, 2);

	$len_l = $this->str_len($left);
	$len_r = $this->str_len($right);
	$len_c = $this->str_len($center);

// pert from head when less than length
	if ( ( $len_l + $len_c ) <= $len ) {
		$ret  = $this->sub_str( $text, 0, $len );
		$ret .= $tail;

// part from tail when less than half length
	} elseif ( ( $len_r + $len_c ) <= $len ) {
		$ret  = $head ; 
		$ret .= $this->sub_str( $text, -$len, $len );

	} else {
		if ( $len_l <= $half ) {
			$ret = $left;
		} else {
			$left_start = $len_l - $half + 1;
			$ret  = $head;
			$ret .= $this->sub_str( $left, $left_start, $half );
		}
		$ret .= $match[0];
		$remainder = $len - $this->str_len($ret);
		if ( $len_r <= $remainder ) {
			$ret .= $right;
		} else {
			$ret .= $this->sub_str( $right, 0, $remainder );
			$ret .= $tail ;
		}
	}

	return $ret;
}

//---------------------------------------------------------
// for japanese
//---------------------------------------------------------
function str_add_space_after_punctuation_ja( $str )
{
	$str = $this->add_space_after_str_ja( $str , $this->_JA_KUTEN );
	$str = $this->add_space_after_str_ja( $str , $this->_JA_DOKUTEN );
	$str = $this->add_space_after_str_ja( $str , $this->_JA_PERIOD );
	$str = $this->add_space_after_str_ja( $str , $this->_JA_COMMA );
	return $str;
}

function add_space_after_str_ja( $str, $word )
{
	if ( $word ) {
		return $this->m_mb_ereg_replace( $word, $word.' ', $str );
	}
	return $str;
}

function set_is_japanese( $val )
{
	$this->_is_japanese = $val;
}

function set_ja_kuten( $val )
{
	$this->_JA_KUTEN = $val;
}

function set_ja_dokuten( $val )
{
	$this->_JA_DOKUTEN = $val;
}

function set_ja_period( $val )
{
	$this->_JA_PERIOD = $val;
}

function set_ja_comma( $val )
{
	$this->_JA_COMMA = $val;
}

// --- class end ---
}

?>