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Custom tag parser
by: Armando
|
May 6, 2003
Version: 1.2
Type: Class
Category: Other
License: GNU General Public License
Description: This class can parse your custom tags and submits function for it .. example: <mytag:tagImage src="myigame.gif"></mytag:image> would call your function tagImage tags can be also written like <tag="something">data</tag> constants in the start of file define that
<?php
/**
* My Tag class
* @author Armando Ota <armando.ota@rs-pi.com>
* @version 1.2
* @since 28.04.2003, 08:33:49
* @copyright GPL - jada jada jada
**/
define("MYTAG_PREFIX","rendertag"); //prefixes you may use
define("MYTAG_CONVERT_TO_BR","0"); //converts CR to HTML <BR />
define("MYTAG_SEPARATOR",":"); //defines separator
class myTag {
var $tag_stack = null;
var $basic_string = "";
var $CONVERT_TO_BR = 0;
/**
* constructor
* @return
* @version 1.1
* @author Armando Ota <armando.ota@rs-pi.com>
* @since 28.04.2003, 08:43:02
**/
function myTag(){
$this->CONVERT_TO_BR=MYTAG_CONVERT_TO_BR;
}
/**
* definition functions
* INPUT PARAMS ARE NECESSERY !!!
* @param Array $attr=null array of attributes you can use with tag
* @param String $data="" data you want do parse
* @return String
* @version 1.1
* @author Armando Ota <armando.ota@rs-pi.com>
* @since 28.04.2003, 16:37:34
**/
/**
* parser for input string
* @param string $str string for parsing
* @return string
* @version 1.1
* @author Armando Ota <armando.ota@rs-pi.com>
* @since 28.04.2003, 08:43:57
**/
function parseText($str=""){
if($str){
$str=" ".$str;
$start_tag_lok=strpos($str,"<".MYTAG_PREFIX.MYTAG_SEPARATOR);
while($start_tag_lok){
$def_tag_len=strlen("<".MYTAG_PREFIX.MYTAG_SEPARATOR); //length of start string tag
$start_tag_lok_end=strpos($str,">",$start_tag_lok+1); // find the closing gap for start tag
//find tag string
$tag_string=substr($str,$start_tag_lok+$def_tag_len,$start_tag_lok_end-($start_tag_lok+$def_tag_len));
//echo "tag:".$tag_string;
// posibility that tag has been written like <tag='something'>
$start_attr_eq=strpos($tag_string,"="); //find occuarance of '=' sign
$start_attr_space=strpos($tag_string," "); //find occuarance of ' '(whitespace) sign
if($start_attr_space && $start_attr_eq){
if(!$start_attr_space) $start_attr_space=strlen($tag_string);
if($start_attr_eq<$start_attr_space){
//if tag conatins equal sign
$tag_name=substr($tag_string,0,$start_attr_eq);
$attr_str=trim(substr($tag_string,0,strlen($tag_string)+1));
//puts it into array
$attr_arr=explode(" ",$attr_str);
for($i=0;$i<sizeof($attr_arr);$i++){
$sec_attr_arr=explode("=",$attr_arr[$i]);
//attr_stack now has attribute name as key and its value
$attr_stack[$sec_attr_arr[0]]=trim(substr($sec_attr_arr[1],1,strlen($sec_attr_arr[1])-2));
}
} else {
//defines where tag name ends
if($start_attr_space<$start_attr_eq){
$start_attr_pos=$start_attr_space;
} else {
$start_attr_pos=$start_attr_eq;
}
//pick tagname
$tag_name=substr($tag_string,0,$start_attr_pos);
//gets attributes string
$attr_str=trim(substr($tag_string,$start_attr_pos+1,strlen($tag_string)-$start_attr_pos+1));
//puts it into array
$attr_arr=explode(" ",$attr_str);
for($i=0;$i<sizeof($attr_arr);$i++){
$sec_attr_arr=explode("=",$attr_arr[$i]);
//attr_stack now has attribute name as key and its value stored
$attr_stack[$sec_attr_arr[0]]=trim(substr($sec_attr_arr[1],1,strlen($sec_attr_arr[1])-2));
}
}
} else {
$tag_name=substr($tag_string,0,$start_tag_lok_end-$def_tag_len);
}
//echo $tag_name;
//data between start and end tags
$end_tag_lok=strpos($str,"</".MYTAG_PREFIX.MYTAG_SEPARATOR.$tag_name.">");
if($end_tag_lok){
$tag_data=substr($str,$start_tag_lok_end+1,$end_tag_lok-$start_tag_lok_end-1);
$end_tag_len=strlen("</".MYTAG_PREFIX.MYTAG_SEPARATOR.$tag_name.">");
//builds the whole string (start and end tag) for replacement
$whole_tag_string=substr($str,$start_tag_lok,($end_tag_lok+$end_tag_len)-$start_tag_lok);
if(method_exists($this,$tag_name)){ //checks if tag method exists and calls it
$str=str_replace($whole_tag_string,call_user_func(array("myTag",$tag_name),$attr_stack,$this->parseText($tag_data)),$str);
} else {
$str=str_replace($whole_tag_string,$this->parseText($tag_data),$str); //if tag method does not exists then we replace tag with text
}
}
$start_tag_lok=strpos($str,"<".MYTAG_PREFIX.MYTAG_SEPARATOR,$start_tag_lok+1);
}
if($this->CONVERT_TO_BR){
$str=str_replace(chr(10),"<br />",$str);
}
}
return $str;
}
}
?>
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