Leaf.php

<?php
	namespace Undercloud;

	class Leaf
	{
		private $format      = false;
		private $indent      = '  ';
		private $level       = 0;
		private $tags_stack  = array();
		private $fill_stack  = array();
		private $selfclosing = array('area', 'base', 'br', 'col', 'command', 'embed', 'hr', 'img', 'input', 'keygen', 'link', 'meta', 'param', 'source', 'track', 'wbr');
		private $content     = '';

		public function __construct(array $o = array())
		{
			if (isset($o['selfclosing'])) {
				$this->selfclosing = $o['selfclosing'];
			}

			if (isset($o['format'])) {
				$this->format = $o['format'];
			}

			if (isset($o['indent'])) {
				$this->indent = $o['indent'];
			}
		}

		public static function init(array $o = array())
		{
			return new self($o);
		}

		public static function escape($a, $de = false)
		{
			return htmlentities($a, ENT_QUOTES, 'UTF-8', $de);
		}

		public function el($tag)
		{
			$attr   = array();
			$text   = null;
			$args   = func_get_args();
			$lclass = array();

			switch (count($args)) {
				case 2:
					if (is_array($args[1])) {
						$attr = $args[1];
					} else {
						$text = $args[1];
					}
				break;

				case 3:
					$attr = $args[1];
					$text = $args[2];
				break;
			}

			$tag = preg_replace_callback(
				'/(\.|\#|\:)([A-Za-z0-9\-\_]+)/',
				function ($m) use (&$attr, &$lclass) {
					switch ($m[1]) {
						case '.':
							$lclass[] = $m[2];
						break;

						case '#':
							$attr['id'] = $m[2];
						break;

						case ':':
							if (in_array($m[2], array('button', 'checkbox', 'file', 'hidden', 'image', 'password', 'radio', 'reset', 'submit', 'text'))) {
								$attr['type'] = $m[2];
							} else if (in_array($m[2], array('checked', 'disabled', 'readonly', 'required', 'multiple'))) {
								$attr[$m[2]] = $m[2];
							}
						break;
					}

					return;
				},
				$tag
			);

			if ($attr) {
				if (isset($attr['class']) and $attr['class']) {
					$attr['class'] = implode(' ', array_merge(
						$lclass,
						explode(' ', $attr['class'])
					));
				} else if ($lclass) {
					$attr['class'] = implode(' ', $lclass);
				}

				array_walk($attr, function (&$a, $b) {
					if (is_integer($b)) {
						$a = static::escape($a);
					} else {
						if ('style' == $b and is_array($a)) {
							array_walk($a, function (&$x, $y) {
								$x = ($y . ':' . $x);
							});

							$a = implode(';', $a);
						}

						$a = $b . '="' . static::escape($a) . '"';
					}
				});
			}

 			$space = '';

 			if (true === $this->format) {
				$indent = str_repeat($this->indent, $this->level);
 			}

			$closed = in_array($tag, $this->selfclosing);

			if (false == $closed) {
				$this->tags_stack[] = $tag;
				$this->level++;
			}

			if (true === $this->format) {
				$this->fill_stack[] = (false == $closed and $text !== null);
				$space = ($this->level > 1 ? (PHP_EOL . $indent) : '');
			}

			$this->content .= $space . '<' . $tag . ($attr ? (' ' . implode(' ', $attr)) : '') . ($closed ? ' />' : '>') . static::escape($text);

			return $this;
		}

		public function text($t)
		{
			$this->content .= static::escape($t);

			return $this;
		}

		public function raw($r)
		{
			$this->content .= $r;

			return $this;
		}

		public function __get($p)
		{
			if ($p == 'end') {
				return $this->end();
			} else {
				throw new \Exception(
					sprintf('Undefined property %s', $p)
				);
			}
		}

		public function end()
		{
			$space = '';
			$this->level--;

			if (true === $this->format) {
				$indent = str_repeat($this->indent, (($this->level >= 0) ? $this->level : 0));
				$space  = (false == array_pop($this->fill_stack) ? (PHP_EOL . $indent) : '');
			}

			$this->content .= $space . '</' . array_pop($this->tags_stack) . '>';

			return $this;
		}

		public function __toString()
		{
			return $this->content;
		}
	}
?>