summaryrefslogtreecommitdiff
path: root/it_html.class
blob: 2bfc22d18a80446191d3eaf5e5a9d22034682c7d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
<?php
/*
**	$Id$
**
**	Copyright (C) 1995-2007 by the ITools Authors.
**	This file is part of ITools - the Internet Tools Library
**
**	ITools is free software; you can redistribute it and/or modify
**	it under the terms of the GNU General Public License as published by
**	the Free Software Foundation; either version 3 of the License, or
**	(at your option) any later version.
**
**	ITools is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**	GNU General Public License for more details.
**
**	You should have received a copy of the GNU General Public License
**	along with this program.  If not, see <http://www.gnu.org/licenses/>.
**
**	UltraHTML 3000 tool layer. Create functions for html tags.
**
**	new it_html;
**	echo html(head('title' => 'hello'), body(h1('hello'), p('Hello world!')));
**/

class it_html
{

/**
 * Create a HTML object and global functions for all methods (exlcluding
 * methods starting with '_') in this class plus the default tags (see below).
 *
 * @param $p Configuration settings. Can be set/overridden in constructor, configure(), html() or head().
 *           See source code for a list of supported values
 */
function it_html($p = array())
{
	# Default configuration of html class
	$this->p = $p + array(
		'charset' => 'iso-8859-1',
		'doctype' => null,                    # Custom doctype (will usually be calculated from htmltype)
		'head' => '',                         # Code to put into head() section
		'htmltype' => 'xhtml',                # 'html' (=old-style), 'xhtml' or 'xhtml-mobile'
		'lang' => 'de',                       # Language code to use in <html lang="..."> tag
		'ie_png_fix' => false,                # To enable, supply URL of a transparent gif (like /images/0.gif)
		'moretags' => '',                     # Comma-separated list of tag-functions to generate additionally to 'tags'
		'name' => 'it_html',                  # Name of global variable $this is assigned to (string), XXX Copy and paste in configure() to keep PHP4 compatibility
		'nonewlinetags' => 'a,b,em,img,input,label,span,noscript', # tags that do not like newlines after them
		'notexported' => 'configure,sanitize',# Those methods are not exported
		'prettyprint' => false,               # Should output be prettily indented?
		'show_boot_dom' => false,             # If true, append invisible <div id="it_boot_dom"> at the end of body
		'show_content_type' => true,          # If true, add <meta http-equiv="Content-Type" ...> header
		'show_favicon' => true,               # If true, add <link> tag to /favicon.ico if it exists
		'favicon' => '',	              # If set, add favicon <link> tag to this url
		'staticallycallable' => 'Q,U,select', # Those methods are statically callable (have same arguments as global stubs) but are a bit slower
		'tags' => 'a,b,br,button,div,em,fieldset,form,h1,h2,h3,h4,h5,h6,hr,input,label,legend,li,meta,noscript,p,span,style,table,tbody,td,textarea,th,thead,tr,ul',
		'title' => '',                        # HTML title (default: no title added)
		'use_it_state' => false,              # If true, generate code needed by state.js (aka 'history iframe')
	);

	# We know these doctypes. If you need something else, supply 'doctype' in p
	$this->doctypes = array(
		'html'		=> '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">',
		'xhtml'		=> '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">',
		'xhtml-mobile'	=> '<!DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.0//EN" "http://www.wapforum.org/DTD/xhtml-mobile10.dtd">'
	);

	$this->hasnonewline = array_flip(explode(',', $this->p['nonewlinetags']));
	$notexported = array_flip(explode(',', "dummy," . $this->p['notexported']));		# dummy keeps values > 0

	# Create global functions for _tags
	foreach (array_merge(explode(',', $this->p['tags']), explode(',', $this->p['moretags'])) as $func)
	{
		if (!function_exists($func) && $func)
			$code[$func] = "function $func() { \$args = func_get_args(); return \$GLOBALS['{$this->p['name']}']->_tag('$func', \$args); }";
	}

	# Create global functions for it_html methods
	foreach (get_class_methods(get_class($this)) as $func)
	{
		if (!preg_match('/^_/', $func) && !is_a($this, $func) && $func && !function_exists($func) && !$notexported[$func])
			$code[$func] = "function $func() { \$args = func_get_args(); return \$GLOBALS['{$this->p['name']}']->$func(\$args); }";
	}

	# Create global functions for methods that are statically callable (have same arguments as global stubs)
	foreach (explode(',', $this->p['staticallycallable']) as $func)
	{
		if ($func && !function_exists($func))
			$code[$func] = "function $func() { \$args = func_get_args(); return call_user_func_array(array(&\$GLOBALS['{$this->p['name']}'], '$func'), \$args); }";
	}

	eval(join('', (array)$code));

	# Since name is given as param, it is our duty to store it, not our caller's.
	$GLOBALS[$this->p['name']] =& $this;
}


/**
 * Modify configuration of it_html, e.g. htmltype after it was instantiated.
 * @param $p Configuration settings. Can be set/overridden in constructor, configure(), html() or head().
 *           See constructor for a list of supported values
 */
function configure($p)
{
	$p += array('name' => "it_html");	# XXX Copy and paste from constructor to keep PHP4 compatibility
	$GLOBALS[$p['name']]->p = $p + (array)$GLOBALS[$p['name']]->p;
	$GLOBALS[$p['name']]->hasnonewline = array_flip(explode(',', $GLOBALS[$p['name']]->p['nonewlinetags']));
}

/**
 * Return doctype and entire HTML page.
 * Example application code to render page:
 *     echo html(head(...), body(...));
 *
 * @param any number of text args or array of key => value pairs
 * Defaults for key => value parameters are inherited from the it_html constructor and should be set there.
 * The parameters are $p['lang'], $p['htmltype'] and $p['doctype']
 */
function html($args)
{
	list($data, $p) = $this->_parse_args($args);
	$p += $this->p;

	$html = ($p['doctype'] ? $p['doctype'] : $this->doctypes[$p['htmltype']]) . "\n" .
		'<html ' . ($p['htmltype'] == "xhtml" ? 'xmlns="http://www.w3.org/1999/xhtml" ' : '') . ($p['htmltype'] == "xhtml-mobile" ? 'xml:lang' : 'lang') . "=\"{$p['lang']}\">\n" . $data . ($p['omit_endhtml'] ? '' : "</html>\n");

	return EDC('upd') ? it::replace(array('<!DOCTYPE.*<head>' => ''), $html, array('singleline' => true)) : $html;
}


/**
 * Return HTML header on first call or empty string on subsequent calls
 *
 * @param args... any number of assoc arrays and strings. strings will be content of <head>
 * @param $p['content-type']  content type (default: "text/html; charset=iso-8859-1")
 * @param $p['cssinline']     stylesheet to be put in header
 * @param $p['description']   data for <meta name="description"> tag
 * @param $p['keywords']      data for <meta name="keywords"> tag
 * @param $p['stylesheets']   array mediatype => url of styleshests
 * @param $p['title']         content of <title>, will be html encoded
 */
function head($args = array())
{
	if (!$this->head_sent++)
	{
		list($data, $p) = $this->_parse_args($args);

		$p += $this->p;
		$this->p = ($p += array('content-type' => "text/html; charset={$p['charset']}"));

		$header = $p['show_content_type'] ? meta(array('http-equiv' => "Content-Type", 'content' => $p['content-type'])) : "";

		# Enable latest IE mode
		if(strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE'))
			$header .= meta(array('http-equiv' => "X-UA-Compatible", 'content' => "IE=9"));

		foreach(array('description', 'keywords') as $name)
			if (!empty($p[$name]))
				$header .= meta(array('name' => $name, 'content' => $p[$name]));

		# Add favicon
		if ($p['favicon'])
			$header .= tag('link', array('rel' => "shortcut icon", 'href' => $p['favicon']));
		elseif ($p['show_favicon'] && @file_exists($_SERVER['DOCUMENT_ROOT'] . '/favicon.ico'))
			$header .= tag('link', array('rel' => "shortcut icon", 'href' => "/favicon.ico"));

		foreach((array)$p['stylesheets'] as $type => $url)
			$header .= tag('link', array('rel' => "stylesheet", 'type' => "text/css", 'href' => $url) + (is_int($type) ? array() : array('media' => $type)));

		if (!empty($p['cssinline']))
			$header .= tag('style', array('type' => "text/css", "\n" . preg_replace(array('/\s*\/\*[^\*]+\*\//Um', '/\s*\{\s*/', '/;\s+/'), array('', '{', ';'), $p['cssinline'])));

		$header .= $p['head'] . ($p['title'] ? tag('title', strip_tags(Q(strip_tags($p['title'])))) : ""); # remove coloring by .texts and .q debug param

		if($this->p['htmltype'] == "xhtml-mobile" && strpos($_SERVER['HTTP_USER_AGENT'], 'W3C_Validator'))
			header("Content-Type: application/xhtml+xml; charset={$this->p['charset']}"); # for validation
		else if (!headers_sent()) # prevent warnings when ED() in use
			header("Content-Type: " . $p['content-type']);

		$js = $p['jsenv'] ? "var env = " . itjs::serialize($p['jsenv']) . ";\n" : '';
		if ($GLOBALS['it_html']->p['charset'] == "iso-8859-1")
			$js = it_html::latinize($js);

		$js .= $this->_itjs($p['jsinline'], 'inline');

		if ($p['js'])
		{
			$checksum = itjs::checksum(itjs::filenames($p['js']));
			$js .= $this->_itjs("boot.js", "inline");
			$js .= "function it_boot_start(){ " . trim($p['jsboot']) . " }\n";
			$js .= "it_boot('/itjs/" . U($p['js'], array('s' => $checksum)) . "');\n";
		}

		if ($js)
			$data .= $this->js(array($js));

		return tag('head', $header, $data);
	}
}


/**
 * Return HTML head (if not already sent) and body with it_state and it_boot magic code
 */
function body($args)
{
	if ($this->p['use_it_state'])
		array_unshift($args, tag('iframe', array('id' => "it_state", 'src' => "/itjs/state.html", 'width' => 1, 'height' => 1, 'frameborder' => 0)));

	if (EDC('what'))
	{
		$debugvars = array_merge($GLOBALS['ULTRADEBUGVARS'], array('srclines' => 1, 'texts' => 1));
		ksort($debugvars);
		foreach ($debugvars as $var => $dummy)
		{
			if (EDC($var))
				$toggled_host = preg_replace("/$var\./", "", $_SERVER['HTTP_HOST']);
			else
				$toggled_host = preg_replace("/\.([^.]*)\.([^.]*)\.([^.]*)$/", ".$var.\$1.\$2.\$3", $_SERVER['HTTP_HOST']); 
			$debug_links[] = a(array('href' => U('http://' . $toggled_host . $_SERVER['REQUEST_URI']), 'style' => 'font-weight:' . (EDC($var) ? 'bold' : 'normal') . ';'), $var);
		}
		$args[] = div(array('style' => 'font-family:monospace;'), "Debugvars: " . join(" ", $debug_links));
	}

	if ($this->p['show_boot_dom'])
		$args[] = div(array('id' => "it_boot_dom", 'style' => "visibility:hidden"));

	return $this->head() . $this->_tag('body', $args);
}


/**
 * INTERNAL: Parse an arg array (mixed key=>value pairs and strings) and return it
 * as array(0 => all numerical args concatenated, 1 => array(key=>value pairs)
 */
function _parse_args($args)
{
	$p = array();
	foreach ($args as $arg)
	{
		if (is_array($arg))
		{
			foreach ($arg as $key => $value)
			{
				if (is_int($key))
					$data .= it_taintcheck($value);
				else
					$p[$key] = $value;
			}
		}
		else
			$data .= it_taintcheck($arg);
	}

	return array($data, $p);
}


/**
 * function div($args...)
 * Return a <div>...</div> element
 * Any strings in the argument list will be content of the <div>
 * Any associative arrays among the arguments will create attributes for <div>.
 * Attributes with values false or null will be omitted completely.
 * Attributes with value true can be used for boolean attributes like 'checked'
 * Attribute values will be html encoded, content values won't so you may need to use Q(). 
 * @see _tag()
 */ #:}

/**
 * INTERNAL: Create html tag from name and args array (the arguments of the parent function)
 */
function _tag($name, $args)
{
	list($data, $attr) = $this->_parse_args($args);

	$newline = isset($this->hasnonewline[$name]) ? "" : "\n";

	# Ultra XML PrettyPrinter 3000 [\] by SCA
	if ($this->p['prettyprint'] && $newline && (substr($data, -1, 1) == "\n") && (strpos($data, '<textarea') === false && strpos($data, '<pre') === false) && ($data != strip_tags($data)))
		$data = str_replace("\n", "\n  ", "\n" . trim($data)) . "\n";

	# debugging aid: add backtrace
	if (($levels = intval($GLOBALS['debug_srclines'])) && !it::match('^(head|meta|title|script|style|link)', $name))
		$attr = array('title' => it_debug::backtrace(array('levels' => max(3, $levels), 'skipfiles' => "_html\\.class"))) + $attr;

	$result .= "<$name";

	# add attributes. If $value === true, use key only (<td nowrap> instead of <td nowrap=""> for old html, <td nowrap="nowrap"> for xhtml style)
	foreach($attr as $key => $value)
	{
		if (($value === null) || ($value === false))	# null or false: omit whole tag
			;
		else if (isset($value) && $value !== true)	# normal case: value
		{
			if (preg_match('/[<>&"\x00-\x08\x0a-\x0c\x0e-\x1f\x80-\x9f]/', $value)) # WARNING: copy/pasted from Q()
				$result .= " $key=\"" . str_replace("\n", "&#10;", htmlspecialchars($GLOBALS['it_html']->p['charset'] == "iso-8859-1" ? it_html::latinize($value) : $value)) . '"';
			else
				$result .= " $key=\"$value\"";
		}
		else						# true: tag without value
			$result .= ($this->p['htmltype'] == 'html') ? " $key" : " $key=\"$key\"";
	}

	# Apply a kind of magic... this needs further investigation
	if (isset($data) || preg_match('/^(a|div|iframe|pre|script|span|tbody|td|thead|textarea)$/i', $name))
		$result .= ">$data</$name>$newline";
	elseif ($this->p['htmltype'] == 'html')
		$result .= ">$newline";
	else
		$result .= " />$newline";

	return $result;
}


/**
 * Return a <tag> containing optional data.
 * @param $name tag name ('style', etc.)
 * @param ... any number optional data or array of key => value arguments
 * @return string containing XML/HTML tag
 */
function tag($args)
{
	$name = array_shift($args);
	return $this->_tag($name, $args);
}

/**
 * Special img() function patches png transparency for IE 5.5-6 if ie_png_fix is set
 * @param ... any number optional data or array of key => value arguments
 * @return <img ... />
 */
function img($args)
{
	if ($this->p['ie_png_fix'] && preg_match('/MSIE [56]/', $_SERVER['HTTP_USER_AGENT']))
	{
		foreach($args as $id => $arg)
			if (preg_match('/\.png(\?.*)?$/', $arg['src']))
			{
				$args[$id]['style'] = "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='{$arg['src']}',sizingMethod='crop');" . $arg['style'];
				$args[$id]['src'] = $this->p['ie_png_fix'];
			}
	}

	foreach ($args as $arg)
		$havealt += isset($arg['alt']);

	if (!$havealt)
		it::error('img() needs alt');

	return $this->_tag("img", $args);
}


/**
 * Create a dropdown menu object. Warning: encodes html code within options!
 * @param $tags key => value pairs of <select> tag
 * @param $options array (value => text) of available options or
 *        string key:val{,key:val} where key will be rawurldecoded so it may contain %2C as comma
 *        supports optgroups as array (value => optgroup => array(value => text))
 * @param $selected optional currently selected value, or comma-separated list or array for multi-select
 * Note: use tag('select') and tag('option') if you want do roll your own
 */
function select($tags, $options, $selected = null)
{
	# Transmogrify key:val{,key:val} to array(key => val)
	if (!is_array($options))
	{
		$opts = explode(',', $options);
		$options = array();

		foreach($opts as $opt)
		{
			list($key, $value) = explode(':', $opt);
			$options[rawurldecode($key)] = $value;
		}
	}

	$selected = ($tags['multiple'] && is_string($selected)) ? explode(',', $selected) : (array)$selected;

	$html = "";
	foreach($options as $value => $option)
	{
		if (is_array($option))
		{
			$grouphtml = "";
			foreach($option as $optval => $opt)
				$grouphtml .= $this->_tag("option", array(array('value' => $optval, 'selected' => in_array((string)$optval, $selected)), self::_strip_span(Q(self::_strip_span($opt)))));
			$html .= $this->_tag("optgroup", array(array('label' => $value, $grouphtml)));
		}
		else
			$html .= $this->_tag("option", array(array('value' => $value, 'selected' => in_array((string)$value, $selected), 'disabled' => $option === ""), (trim($option) === "") ? "&nbsp;" : self::_strip_span(Q(self::_strip_span($option))))); # self::_strip_span removes .q debug param coloring
	}

	return $this->_tag("select", array($tags, $html));
}

# internal: strip spans added by debug params
function _strip_span($html)
{
	return preg_replace('!</?span[^>]*>!', '', $html);
}

/**
 * Return HTML with all evil things stripped. Allowed are a coupld of simple
 * tags like div, p, i, b, br without attributes, a with absolute href,
 * img with absolute src url. Also ensures that tags are balanced.
 * @param $html HTML string to be sanitized
 * @return Sanitized HTML
 */
function sanitize($html)
{
	$result = "";
	$html = it::replace(array('[\0\s]+' => " "), $html);	# \s also matches \r and \n
	$urlpattern = 'https?://[^">]+';
	$charset = $GLOBALS['it_html']->p['charset'] ? $GLOBALS['it_html']->p['charset'] : 'iso-8859-1';

	if ($tag = it::match("(.*)<(div|p|i|b)\b[^>]*>(.*?)</\\2>(.*)", $html))
	{
		# Simple tags with content, no attributes kept
		list($head, $tagname, $content, $tail) = $tag;
		$tagname = strtolower($tagname);
		$result .= it_html::sanitize($head) . "<$tagname>" . it_html::sanitize($content) . "</$tagname>" . it_html::sanitize($tail);
	}
	else if ($tag = it::match('(.*)<a\b[^>]+?href="(' . $urlpattern . ')"[^>]*?>(.*?)</a>(.*)', $html))
	{
		# Link tags, keeps only href attribute
		list($head, $href, $content, $tail) = $tag;
		$result .= it_html::sanitize($head) . '<a href="' . it_html::Q(it_html::U(html_entity_decode($href, ENT_COMPAT, $charset))) . '">' . it_html::sanitize($content) . "</a>" . it_html::sanitize($tail);
	}
	else if ($tag = it::match('(.*)<img\b[^>]+?src="(' . $urlpattern . ')"[^>]*?>(.*)', $html))
	{
		# Image tags, keeps only src attribute
		list($head, $src, $tail) = $tag;
		$result .= it_html::sanitize($head) . '<img src="' . it_html::Q(it_html::U(html_entity_decode($src, ENT_COMPAT, $charset))) . '" alt="" />' . it_html::sanitize($tail);
	}
	else if ($tag = it::match("(.*)<(br|/tr)\b[^>]*>(.*)", $html))
	{
		# brs and table rows are converted so simple line breaks
		list($head, $tagname, $tail) = $tag;
		$result .= it_html::sanitize($head) . "<br />" . it_html::sanitize($tail);
	}
	else
		$result = it::replace(array('&amp;(#\d+;)' => '&$1'), it_html::Q(html_entity_decode(strip_tags($html), ENT_COMPAT, $charset)));

	return $GLOBALS['debug_q'] ? "<span style='background:#8FF'>$result</span>" : $result;
}

/**
 * Decode all entities, ensure latin-1 encoding
 */
function entity_decode($string)
{
	$string = preg_replace('/&#(8217|65533);/', "'", html_entity_decode($string));
	$string = preg_replace('/&#x0*([0-9a-f]+);/ei', 'hexdec("\\1") <= 255 ? chr(hexdec("\\1")) : " "', $string);
	$string = preg_replace('/&#0*([0-9]+);/e', '\\1 <= 255 ? chr(\\1) : " "', $string);

	return $string;
}

/**
 * Replace or remove all illegal characters from a latin-1 string
 */
function latinize($string)
{
	return preg_replace('/[\x00-\x08\x0b-\x0c\x0e-\x1f\x80-\x9f]/', ' ', strtr($string, array("\x80" => "EUR", "\x82" => "'", "\x84" => "\"", "\x85" => "...", "\x8a" => "S", "\x8c" => "OE", "\x8e" => "Z", "\x91" => "'", "\x92" => "'", "\x93" => "\"", "\x94" => "\"", "\x96" => "-", "\x97" => "-", "\x9a" => "s", "\x9e" => "z")));
}

/**
 * Shortcut: return htmlspecialchars($string) and encode forbidden characters 80-9f if latin1 is output
 * @param $string String to encode with htmlspecialchars()
 * @return htmlspecialchars($string)
 */
function Q($string)
{
	if (preg_match('/[<>&"\x00-\x08\x0a-\x0c\x0e-\x1f\x80-\x9f]/', $string)) # WARNING: copy/pasted to _tag()
		$string = htmlspecialchars($GLOBALS['it_html']->p['charset'] == "iso-8859-1" ? it_html::latinize($string) : $string);

	return $GLOBALS['debug_q'] && $string ? "<span style='background:#8FF'>$string</span>" : $string;
}


/**
 * Build a complete url from base-url and params
 * @param ... scalar args and numeric indices build base-url, rest as params
 */
function U(/* ... */)
{
	$args = func_get_args();
	list($base, $params) = it_html::_parse_args($args);

	if (!isset($base))
		$base = preg_replace('/\?.*/', '', $_SERVER['REQUEST_URI']);

	$base = preg_replace(array('|\0|', '/\\\\/'), array('', '/'), $base); # kill null chars, turn \ to /

	if (!($u = @parse_url($base)))
		list($u['path'], $u['query']) = explode("?", $base, 2);

	$u['host'] = preg_match('/[^-_.0-9a-z]/i', $u['host']) && function_exists('idn_to_ascii') && ($idnahost = idn_to_ascii($GLOBALS['it_html']->p['charset'] == "iso-8859-1" ? utf8_encode($u['host']) : $u['host'])) ? $idnahost : $u['host'];	# Punycode hostname to include into webpage
	$u['host'] = preg_replace('/[^-_.0-9a-z\x80-\xff]/ie', "rawurlencode('\$0')", $u['host']); # Encode garbage chars in host

	# handle scheme, user (urlencoded), password, host
	$hostpart = 
		($u['user'] ? preg_replace('|[^-a-z0-9_.+!*(),:?@&=/~$%#]|ie', 'urlencode(stripslashes("$0"))', $u['user'] . ($u['pass'] ? ":" . $u['pass'] : "") . "@") : "") .
		($u['host'] ? $u['host'] : "") .
		($u['port'] ? ":" . intval($u['port']) : "");

	$schemepart = $hostpart ? ($u['scheme'] ? $u['scheme'] . ":" : "") . "//$hostpart" : "";

	$path = $u['path'] . ($u['query'] ? "?" . $u['query'] : "") . ($u['fragment'] ? "#" . $u['fragment'] : "");

	# hack: encode % if not followed by two hex digits
	$parts = preg_split('/%([^%]{0,2})/', $path, -1, PREG_SPLIT_DELIM_CAPTURE);
	for ($i = 1; $i < count($parts); $i+=2)
		$parts[$i] = (preg_match('/[0-9a-f][0-9a-f]/i', $parts[$i]) ? "%" : "%25") . $parts[$i];
	$path = join("", $parts);

	$path = preg_replace('|[^-a-z0-9_.+!*(),:?@&=/~$%#]|ie', 'urlencode(stripslashes("$0"))', $path);	# Single quotes are escaped with slash by preg_replace, remove it for urlencode
	$path = preg_replace('|^([a-z0-9_]+:)?//[^/]*$|', '$0/', $path);	# Add slash if absolute url without a path, e.g. http://gna.ch
	$queryparams = it_url::params($params);
	$separator = strpos($path, "?") === false ? "?" : "&";

	return $schemepart . $path . ($queryparams ? "$separator$queryparams" : "");
}


/**
 * Insert a javascript script
 * @param ... any number optional data or array of key => value arguments
 * @return <script type="text/javascript"...>...</script>
 */
function js($args)
{
	if (($this->p['htmltype'] != 'html') && $args[0] && ((array)$args[0] === array_values((array)$args[0])))
	{
		array_unshift($args, "<!--//--><![CDATA[//><!--\n");
		$args[] = "\n//--><!]]>";
	}

	array_unshift($args, array('type' => 'text/javascript'));
	return $this->_tag('script', $args);
}


/**
 * Include javascript code or generate HTML to include it
 */
function _itjs($files, $mode)
{
	$result = "";

	if ($files)
	{
		$filenames = itjs::filenames($files);

		if ($mode == "files")
		{
			foreach ($filenames as $file)
				$result .= tag('script', array('type' => "text/javascript", 'src' => "/itjs/" . basename($file) . "?v=" . itjs::checksum($file)));
		}
		else if ($mode == "inline")
		{
			$jsfile = "";

			foreach ($filenames as $file)
				$jsfile .= @file_get_contents($file);

			$result .= itjs::strip($jsfile);
		}
		else
			$result .= tag('script', array('type' => "text/javascript", 'src' => "/itjs/$files?v=" . itjs::checksum($filenames)));
	}

	return $result;
}

}
?>