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  1: <?php
  2: 
  3: /**
  4:  * This file is part of the Nette Framework (https://nette.org)
  5:  * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
  6:  */
  7: 
  8: namespace Nette\Utils;
  9: 
 10: use Nette;
 11: 
 12: 
 13: /**
 14:  * HTML helper.
 15:  *
 16:  * <code>
 17:  * $el = Html::el('a')->href($link)->setText('Nette');
 18:  * $el->class = 'myclass';
 19:  * echo $el;
 20:  *
 21:  * echo $el->startTag(), $el->endTag();
 22:  * </code>
 23:  */
 24: class Html implements \ArrayAccess, \Countable, \IteratorAggregate, IHtmlString
 25: {
 26:     use Nette\SmartObject;
 27: 
 28:     /** @var array  element's attributes */
 29:     public $attrs = [];
 30: 
 31:     /** @var bool  use XHTML syntax? */
 32:     public static $xhtml = false;
 33: 
 34:     /** @var array  empty (void) elements */
 35:     public static $emptyElements = [
 36:         'img' => 1, 'hr' => 1, 'br' => 1, 'input' => 1, 'meta' => 1, 'area' => 1, 'embed' => 1, 'keygen' => 1,
 37:         'source' => 1, 'base' => 1, 'col' => 1, 'link' => 1, 'param' => 1, 'basefont' => 1, 'frame' => 1,
 38:         'isindex' => 1, 'wbr' => 1, 'command' => 1, 'track' => 1,
 39:     ];
 40: 
 41:     /** @var array  of Html | string nodes */
 42:     protected $children = [];
 43: 
 44:     /** @var string  element's name */
 45:     private $name;
 46: 
 47:     /** @var bool  is element empty? */
 48:     private $isEmpty;
 49: 
 50: 
 51:     /**
 52:      * Static factory.
 53:      * @param  string element name (or null)
 54:      * @param  array|string element's attributes or plain text content
 55:      * @return static
 56:      */
 57:     public static function el($name = null, $attrs = null)
 58:     {
 59:         $el = new static;
 60:         $parts = explode(' ', (string) $name, 2);
 61:         $el->setName($parts[0]);
 62: 
 63:         if (is_array($attrs)) {
 64:             $el->attrs = $attrs;
 65: 
 66:         } elseif ($attrs !== null) {
 67:             $el->setText($attrs);
 68:         }
 69: 
 70:         if (isset($parts[1])) {
 71:             foreach (Strings::matchAll($parts[1] . ' ', '#([a-z0-9:-]+)(?:=(["\'])?(.*?)(?(2)\\2|\s))?#i') as $m) {
 72:                 $el->attrs[$m[1]] = isset($m[3]) ? $m[3] : true;
 73:             }
 74:         }
 75: 
 76:         return $el;
 77:     }
 78: 
 79: 
 80:     /**
 81:      * Changes element's name.
 82:      * @param  string
 83:      * @param  bool  Is element empty?
 84:      * @return static
 85:      * @throws Nette\InvalidArgumentException
 86:      */
 87:     public function setName($name, $isEmpty = null)
 88:     {
 89:         if ($name !== null && !is_string($name)) {
 90:             throw new Nette\InvalidArgumentException(sprintf('Name must be string or null, %s given.', gettype($name)));
 91:         }
 92: 
 93:         $this->name = $name;
 94:         $this->isEmpty = $isEmpty === null ? isset(static::$emptyElements[$name]) : (bool) $isEmpty;
 95:         return $this;
 96:     }
 97: 
 98: 
 99:     /**
100:      * Returns element's name.
101:      * @return string
102:      */
103:     public function getName()
104:     {
105:         return $this->name;
106:     }
107: 
108: 
109:     /**
110:      * Is element empty?
111:      * @return bool
112:      */
113:     public function isEmpty()
114:     {
115:         return $this->isEmpty;
116:     }
117: 
118: 
119:     /**
120:      * Sets multiple attributes.
121:      * @param  array
122:      * @return static
123:      */
124:     public function addAttributes(array $attrs)
125:     {
126:         $this->attrs = array_merge($this->attrs, $attrs);
127:         return $this;
128:     }
129: 
130: 
131:     /**
132:      * Appends value to element's attribute.
133:      * @param  string
134:      * @param  string|array value to append
135:      * @param  string|bool  value option
136:      * @return static
137:      */
138:     public function appendAttribute($name, $value, $option = true)
139:     {
140:         if (is_array($value)) {
141:             $prev = isset($this->attrs[$name]) ? (array) $this->attrs[$name] : [];
142:             $this->attrs[$name] = $value + $prev;
143: 
144:         } elseif ((string) $value === '') {
145:             $tmp = &$this->attrs[$name]; // appending empty value? -> ignore, but ensure it exists
146: 
147:         } elseif (!isset($this->attrs[$name]) || is_array($this->attrs[$name])) { // needs array
148:             $this->attrs[$name][$value] = $option;
149: 
150:         } else {
151:             $this->attrs[$name] = [$this->attrs[$name] => true, $value => $option];
152:         }
153:         return $this;
154:     }
155: 
156: 
157:     /**
158:      * Sets element's attribute.
159:      * @param  string
160:      * @param  mixed
161:      * @return static
162:      */
163:     public function setAttribute($name, $value)
164:     {
165:         $this->attrs[$name] = $value;
166:         return $this;
167:     }
168: 
169: 
170:     /**
171:      * Returns element's attribute.
172:      * @param  string
173:      * @return mixed
174:      */
175:     public function getAttribute($name)
176:     {
177:         return isset($this->attrs[$name]) ? $this->attrs[$name] : null;
178:     }
179: 
180: 
181:     /**
182:      * Unsets element's attribute.
183:      * @param  string
184:      * @return static
185:      */
186:     public function removeAttribute($name)
187:     {
188:         unset($this->attrs[$name]);
189:         return $this;
190:     }
191: 
192: 
193:     /**
194:      * Overloaded setter for element's attribute.
195:      * @param  string    HTML attribute name
196:      * @param  mixed     HTML attribute value
197:      * @return void
198:      */
199:     public function __set($name, $value)
200:     {
201:         $this->attrs[$name] = $value;
202:     }
203: 
204: 
205:     /**
206:      * Overloaded getter for element's attribute.
207:      * @param  string    HTML attribute name
208:      * @return mixed     HTML attribute value
209:      */
210:     public function &__get($name)
211:     {
212:         return $this->attrs[$name];
213:     }
214: 
215: 
216:     /**
217:      * Overloaded tester for element's attribute.
218:      * @param  string    HTML attribute name
219:      * @return bool
220:      */
221:     public function __isset($name)
222:     {
223:         return isset($this->attrs[$name]);
224:     }
225: 
226: 
227:     /**
228:      * Overloaded unsetter for element's attribute.
229:      * @param  string    HTML attribute name
230:      * @return void
231:      */
232:     public function __unset($name)
233:     {
234:         unset($this->attrs[$name]);
235:     }
236: 
237: 
238:     /**
239:      * Overloaded setter for element's attribute.
240:      * @param  string  HTML attribute name
241:      * @param  array   (string) HTML attribute value or pair?
242:      * @return mixed
243:      */
244:     public function __call($m, $args)
245:     {
246:         $p = substr($m, 0, 3);
247:         if ($p === 'get' || $p === 'set' || $p === 'add') {
248:             $m = substr($m, 3);
249:             $m[0] = $m[0] | "\x20";
250:             if ($p === 'get') {
251:                 return isset($this->attrs[$m]) ? $this->attrs[$m] : null;
252: 
253:             } elseif ($p === 'add') {
254:                 $args[] = true;
255:             }
256:         }
257: 
258:         if (count($args) === 0) { // invalid
259: 
260:         } elseif (count($args) === 1) { // set
261:             $this->attrs[$m] = $args[0];
262: 
263:         } else { // add
264:             $this->appendAttribute($m, $args[0], $args[1]);
265:         }
266: 
267:         return $this;
268:     }
269: 
270: 
271:     /**
272:      * Special setter for element's attribute.
273:      * @param  string path
274:      * @param  array query
275:      * @return static
276:      */
277:     public function href($path, $query = null)
278:     {
279:         if ($query) {
280:             $query = http_build_query($query, '', '&');
281:             if ($query !== '') {
282:                 $path .= '?' . $query;
283:             }
284:         }
285:         $this->attrs['href'] = $path;
286:         return $this;
287:     }
288: 
289: 
290:     /**
291:      * Setter for data-* attributes. Booleans are converted to 'true' resp. 'false'.
292:      * @return static
293:      */
294:     public function data($name, $value = null)
295:     {
296:         if (func_num_args() === 1) {
297:             $this->attrs['data'] = $name;
298:         } else {
299:             $this->attrs["data-$name"] = is_bool($value) ? json_encode($value) : $value;
300:         }
301:         return $this;
302:     }
303: 
304: 
305:     /**
306:      * Sets element's HTML content.
307:      * @param  IHtmlString|string
308:      * @return static
309:      * @throws Nette\InvalidArgumentException
310:      */
311:     public function setHtml($html)
312:     {
313:         if (is_array($html)) {
314:             throw new Nette\InvalidArgumentException(sprintf('Textual content must be a scalar, %s given.', gettype($html)));
315:         }
316:         $this->removeChildren();
317:         $this->children[] = (string) $html;
318:         return $this;
319:     }
320: 
321: 
322:     /**
323:      * Returns element's HTML content.
324:      * @return string
325:      */
326:     public function getHtml()
327:     {
328:         return implode('', $this->children);
329:     }
330: 
331: 
332:     /**
333:      * Sets element's textual content.
334:      * @param  IHtmlString|string
335:      * @return static
336:      * @throws Nette\InvalidArgumentException
337:      */
338:     public function setText($text)
339:     {
340:         if (!$text instanceof IHtmlString) {
341:             $text = htmlspecialchars((string) $text, ENT_NOQUOTES, 'UTF-8');
342:         }
343:         return $this->setHtml($text);
344:     }
345: 
346: 
347:     /**
348:      * Returns element's textual content.
349:      * @return string
350:      */
351:     public function getText()
352:     {
353:         return html_entity_decode(strip_tags($this->getHtml()), ENT_QUOTES, 'UTF-8');
354:     }
355: 
356: 
357:     /**
358:      * @deprecated
359:      */
360:     public function add($child)
361:     {
362:         trigger_error(__METHOD__ . '() is deprecated, use addHtml() or addText() instead.', E_USER_DEPRECATED);
363:         return $this->addHtml($child);
364:     }
365: 
366: 
367:     /**
368:      * Adds new element's child.
369:      * @param  IHtmlString|string  Html node or raw HTML string
370:      * @return static
371:      */
372:     public function addHtml($child)
373:     {
374:         return $this->insert(null, $child);
375:     }
376: 
377: 
378:     /**
379:      * Appends plain-text string to element content.
380:      * @param  IHtmlString|string
381:      * @return static
382:      */
383:     public function addText($text)
384:     {
385:         if (!$text instanceof IHtmlString) {
386:             $text = htmlspecialchars((string) $text, ENT_NOQUOTES, 'UTF-8');
387:         }
388:         return $this->insert(null, $text);
389:     }
390: 
391: 
392:     /**
393:      * Creates and adds a new Html child.
394:      * @param  string  elements's name
395:      * @param  array|string element's attributes or raw HTML string
396:      * @return static  created element
397:      */
398:     public function create($name, $attrs = null)
399:     {
400:         $this->insert(null, $child = static::el($name, $attrs));
401:         return $child;
402:     }
403: 
404: 
405:     /**
406:      * Inserts child node.
407:      * @param  int|null position or null for appending
408:      * @param  IHtmlString|string Html node or raw HTML string
409:      * @param  bool
410:      * @return static
411:      * @throws Nette\InvalidArgumentException
412:      */
413:     public function insert($index, $child, $replace = false)
414:     {
415:         if ($child instanceof IHtmlString || is_scalar($child)) {
416:             $child = $child instanceof self ? $child : (string) $child;
417:             if ($index === null) { // append
418:                 $this->children[] = $child;
419: 
420:             } else { // insert or replace
421:                 array_splice($this->children, (int) $index, $replace ? 1 : 0, [$child]);
422:             }
423: 
424:         } else {
425:             throw new Nette\InvalidArgumentException(sprintf('Child node must be scalar or Html object, %s given.', is_object($child) ? get_class($child) : gettype($child)));
426:         }
427: 
428:         return $this;
429:     }
430: 
431: 
432:     /**
433:      * Inserts (replaces) child node (\ArrayAccess implementation).
434:      * @param  int|null position or null for appending
435:      * @param  Html|string Html node or raw HTML string
436:      * @return void
437:      */
438:     public function offsetSet($index, $child)
439:     {
440:         $this->insert($index, $child, true);
441:     }
442: 
443: 
444:     /**
445:      * Returns child node (\ArrayAccess implementation).
446:      * @param  int
447:      * @return static|string
448:      */
449:     public function offsetGet($index)
450:     {
451:         return $this->children[$index];
452:     }
453: 
454: 
455:     /**
456:      * Exists child node? (\ArrayAccess implementation).
457:      * @param  int
458:      * @return bool
459:      */
460:     public function offsetExists($index)
461:     {
462:         return isset($this->children[$index]);
463:     }
464: 
465: 
466:     /**
467:      * Removes child node (\ArrayAccess implementation).
468:      * @param  int
469:      * @return void
470:      */
471:     public function offsetUnset($index)
472:     {
473:         if (isset($this->children[$index])) {
474:             array_splice($this->children, (int) $index, 1);
475:         }
476:     }
477: 
478: 
479:     /**
480:      * Returns children count.
481:      * @return int
482:      */
483:     public function count()
484:     {
485:         return count($this->children);
486:     }
487: 
488: 
489:     /**
490:      * Removes all children.
491:      * @return void
492:      */
493:     public function removeChildren()
494:     {
495:         $this->children = [];
496:     }
497: 
498: 
499:     /**
500:      * Iterates over elements.
501:      * @return \ArrayIterator
502:      */
503:     public function getIterator()
504:     {
505:         return new \ArrayIterator($this->children);
506:     }
507: 
508: 
509:     /**
510:      * Returns all children.
511:      * @return array
512:      */
513:     public function getChildren()
514:     {
515:         return $this->children;
516:     }
517: 
518: 
519:     /**
520:      * Renders element's start tag, content and end tag.
521:      * @param  int
522:      * @return string
523:      */
524:     public function render($indent = null)
525:     {
526:         $s = $this->startTag();
527: 
528:         if (!$this->isEmpty) {
529:             // add content
530:             if ($indent !== null) {
531:                 $indent++;
532:             }
533:             foreach ($this->children as $child) {
534:                 if (is_object($child)) {
535:                     $s .= $child->render($indent);
536:                 } else {
537:                     $s .= $child;
538:                 }
539:             }
540: 
541:             // add end tag
542:             $s .= $this->endTag();
543:         }
544: 
545:         if ($indent !== null) {
546:             return "\n" . str_repeat("\t", $indent - 1) . $s . "\n" . str_repeat("\t", max(0, $indent - 2));
547:         }
548:         return $s;
549:     }
550: 
551: 
552:     public function __toString()
553:     {
554:         try {
555:             return $this->render();
556:         } catch (\Exception $e) {
557:         } catch (\Throwable $e) {
558:         }
559:         trigger_error('Exception in ' . __METHOD__ . "(): {$e->getMessage()} in {$e->getFile()}:{$e->getLine()}", E_USER_ERROR);
560:     }
561: 
562: 
563:     /**
564:      * Returns element's start tag.
565:      * @return string
566:      */
567:     public function startTag()
568:     {
569:         if ($this->name) {
570:             return '<' . $this->name . $this->attributes() . (static::$xhtml && $this->isEmpty ? ' />' : '>');
571: 
572:         } else {
573:             return '';
574:         }
575:     }
576: 
577: 
578:     /**
579:      * Returns element's end tag.
580:      * @return string
581:      */
582:     public function endTag()
583:     {
584:         return $this->name && !$this->isEmpty ? '</' . $this->name . '>' : '';
585:     }
586: 
587: 
588:     /**
589:      * Returns element's attributes.
590:      * @return string
591:      * @internal
592:      */
593:     public function attributes()
594:     {
595:         if (!is_array($this->attrs)) {
596:             return '';
597:         }
598: 
599:         $s = '';
600:         $attrs = $this->attrs;
601:         if (isset($attrs['data']) && is_array($attrs['data'])) { // deprecated
602:             trigger_error('Expanded attribute "data" is deprecated.', E_USER_DEPRECATED);
603:             foreach ($attrs['data'] as $key => $value) {
604:                 $attrs['data-' . $key] = $value;
605:             }
606:             unset($attrs['data']);
607:         }
608: 
609:         foreach ($attrs as $key => $value) {
610:             if ($value === null || $value === false) {
611:                 continue;
612: 
613:             } elseif ($value === true) {
614:                 if (static::$xhtml) {
615:                     $s .= ' ' . $key . '="' . $key . '"';
616:                 } else {
617:                     $s .= ' ' . $key;
618:                 }
619:                 continue;
620: 
621:             } elseif (is_array($value)) {
622:                 if (strncmp($key, 'data-', 5) === 0) {
623:                     $value = Json::encode($value);
624: 
625:                 } else {
626:                     $tmp = null;
627:                     foreach ($value as $k => $v) {
628:                         if ($v != null) { // intentionally ==, skip nulls & empty string
629:                             //  composite 'style' vs. 'others'
630:                             $tmp[] = $v === true ? $k : (is_string($k) ? $k . ':' . $v : $v);
631:                         }
632:                     }
633:                     if ($tmp === null) {
634:                         continue;
635:                     }
636: 
637:                     $value = implode($key === 'style' || !strncmp($key, 'on', 2) ? ';' : ' ', $tmp);
638:                 }
639: 
640:             } elseif (is_float($value)) {
641:                 $value = rtrim(rtrim(number_format($value, 10, '.', ''), '0'), '.');
642: 
643:             } else {
644:                 $value = (string) $value;
645:             }
646: 
647:             $q = strpos($value, '"') === false ? '"' : "'";
648:             $s .= ' ' . $key . '=' . $q
649:                 . str_replace(
650:                     ['&', $q, '<'],
651:                     ['&amp;', $q === '"' ? '&quot;' : '&#39;', self::$xhtml ? '&lt;' : '<'],
652:                     $value
653:                 )
654:                 . (strpos($value, '`') !== false && strpbrk($value, ' <>"\'') === false ? ' ' : '')
655:                 . $q;
656:         }
657: 
658:         $s = str_replace('@', '&#64;', $s);
659:         return $s;
660:     }
661: 
662: 
663:     /**
664:      * Clones all children too.
665:      */
666:     public function __clone()
667:     {
668:         foreach ($this->children as $key => $value) {
669:             if (is_object($value)) {
670:                 $this->children[$key] = clone $value;
671:             }
672:         }
673:     }
674: }
675: 
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