3 # Copyright (C) 2005 Jason Woofenden
5 # This file is part of wfpl.
7 # wfpl is free software; you can redistribute it and/or modify it under the
8 # terms of the GNU Lesser General Public License as published by the Free
9 # Software Foundation; either version 2.1 of the License, or (at your option)
12 # wfpl is distributed in the hope that it will be useful, but WITHOUT ANY
13 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
14 # FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
17 # You should have received a copy of the GNU Lesser General Public License
18 # along with wfpl; if not, write to the Free Software Foundation, Inc., 51
19 # Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 # This file contains generally useful template handling code. It is wrapped in
23 # an object so that if you want/need to you can make more than one instance of
24 # it and they won't step on each other's toes. Also there are a set of global
25 # functions at the bottom so you don't have to mess around with objects if you
26 # don't want to. The documentation will be on the object methods, but just know
27 # that each has a straight function wrapper at the bottom with 'tem_' prepended
30 # This is designed to be as simple as it can be for your project. The simple
31 # way to use it is to set some key/value pairs with tem_set() then call
32 # tem_output('filename.html') to output the page. A more complex example
33 # including the use of sub-templates can be found in tem_test.php
35 # FIXME: sub-sub templates need to be cleared when the sub template containing
38 require_once('code/wfpl/encode.php');
39 require_once('code/wfpl/misc.php'); # to get read_whole_file()
42 var $keyval; # an array containing key/value pairs
43 var $filename; # template filename (sometimes not set)
44 var $template; # contents of template
45 var $sub_templates; # tag-name/template-string pairs
46 var $sub_subs; # key: sub-template name value: array of names of the sub-templates of this one
48 # initialize variables
50 $this->keyval = array('' => '~'); # so that ~~ in the template creates a single ~
51 $this->sub_templates = array();
54 # set a key/value pair. if a ~tag~ in the template matches key it will be replaced by value
55 function set($key, $value) {
56 $this->keyval[$key] = $value;
59 # clear a value. Functionally equivalent to set($key, '') but cleaner and more efficient
60 function clear($key) {
61 unset($this->keyval[$key]);
64 # grab a value you stuck in earlier with set()
66 return $this->keyval[$key];
69 # run the template engine on one of the sub-templates and append the result
70 # to the keyval in the main array. See tem_test.php for an example of how
72 function sub($sub_template_name) {
73 $this->keyval[$sub_template_name] .= template_run($this->sub_templates[$sub_template_name], $this->keyval);
75 # after running a sub-template, clear its sub-templates
76 if(isset($this->sub_subs[$sub_template_name])) {
77 foreach($this->sub_subs[$sub_template_name] as $sub_sub) {
78 $this->clear($sub_sub);
83 # this is used by tem::load() and should be otherwise useless
84 function _load(&$in, &$out, &$parents, &$parent) {
86 # scan for one of: 1) the begining of a sub-template 2) the end of this one 3) the end of the file
87 $n = strpos($in, '<!--~');
88 if($n === false) { # not found
89 # we hit the end of the file
95 # move everything up to (but not including) <!-- to the output
96 $out .= substr($in, 0, $n);
97 $in = substr($in, $n);
101 if(strcmp('<!--~end~-->', substr($in, 0, 12)) == 0) {
102 $in = substr($in, 12);
103 $parent = array_pop($parents);
108 # this limits sub_template names to 50 chars
109 if(ereg('^<!--~([^~]*) start~-->', substr($in, 0, 65), $matches)) {
110 list($start_tag, $tag_name) = $matches;
112 # keep track of the tree
113 if(!isset($this->sub_subs[$parent])) {
114 $this->sub_subs[$parent] = array();
116 array_push($this->sub_subs[$parent], $tag_name);
117 array_push($parents, $parent);
120 $out .= '~' . $tag_name . '~';
121 $in = substr($in, strlen($start_tag));
122 $this->sub_templates[$tag_name] = '';
123 $this->_load($in, $this->sub_templates[$tag_name], $parents, $parent);
125 # it's not a start tag or end tag, so let's pass it through:
126 $out .= substr($in, 0, 5);
127 $in = substr($in, 5);
132 # This is useful when you have sub-templates that you want to mess with
133 # before the main template is run. But can also be used to simply specify
134 # the filename ahead of time.
135 function load($filename) {
136 $this->filename = $filename;
137 $tmp = read_whole_file($filename);
138 $this->template = '';
139 $parents = array('top_level_subs' => array());
140 $parent = 'top_level_subs';
141 $this->_load($tmp, $this->template, $parents, $parent);
144 # Run the template. Pass a filename, or a string, unless you've already
145 # specified a template with load()
146 function run($templ = false) {
147 if($templ !== false) {
148 if(strlen($templ) < 150 && file_exists($templ)) {
149 $this->filename = $templ;
150 unset($this->template);
152 $this->template = $templ;
156 if(!$this->template) {
157 if(!$this->filename) {
158 print "sorry, no template to run\n";
162 $this->template = read_whole_file($this->filename);
165 return template_run($this->template, $this->keyval);
168 # same as run() except the output is print()ed
169 function output($templ = false) {
170 print($this->run($templ));
174 # Below are functions so you can use the above class without allocating or
175 # keeping track of it.
177 # get a reference to the current template object
178 function tem_init() {
179 if(!$GLOBALS['wfpl_template']) {
180 $GLOBALS['wfpl_template'] = new tem();
184 function tem_set($key, $value) {
186 $GLOBALS['wfpl_template']->set($key, $value);
189 function tem_get($key) {
191 return $GLOBALS['wfpl_template']->get($key);
194 function tem_run($templ = false) {
196 return $GLOBALS['wfpl_template']->run($templ);
199 function tem_sub($sub_template_name) {
201 $GLOBALS['wfpl_template']->sub($sub_template_name);
204 function tem_load($filename) {
206 $GLOBALS['wfpl_template']->load($filename);
209 function tem_output($filename = false) {
211 $GLOBALS['wfpl_template']->output($filename);
216 # this is used in template_run() and should be of no other use
217 function template_filler($matches) {
218 list($tag, $enc) = explode('.', $matches[1], 2);
219 $value = $GLOBALS['wfpl_template_keyval'][$tag];
221 $encs = explode('.', $enc);
222 foreach($encs as $enc) {
224 if(function_exists($enc)) {
225 $value = $enc($value);
227 print "ERROR: encoder function '$enc' not found.<br>\n";
236 # pass a template string and an associative array of the key/values and it
237 # returns the result.
238 function template_run($template, &$keyval) {
239 $GLOBALS['wfpl_template_keyval'] =& $keyval;
240 return preg_replace_callback(array('|<!--~([^~]*)~-->|', '|~([^~]*)~|', '|<span class="template">([^<]*)</span>|', '|<p class="template">([^<]*)</p>|'), 'template_filler', $template);