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<?php |
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namespace Masterminds\HTML5\Parser; |
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/** |
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* Normalizes HTML. |
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* |
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* This class adds missing root elements, namely <html>, <head>, <body>. <!DOCTYPE> can optionally be added |
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* if specified in the tree structure - by default this is disabled. |
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* |
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* This library treats input HTML as a document fragment rather than a complete document (even if it has a DOCTYPE). |
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* DOMDocument automatically adds missing root elements so this class aims to replicate that functionality. |
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* |
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* @author Kieran Brahney <[email protected]> |
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* @see https://github.com/Masterminds/html5-php/issues/166 |
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*/ |
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class Normalizer |
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{ |
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/** |
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* Structure of a basic HTML document. |
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* |
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* @var array |
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*/ |
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protected $tree = array( |
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'doctype' => '', |
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'html' => array( |
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'start' => '<html>', |
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'end' => '</html>', |
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'content' => array(), |
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), |
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'head' => array( |
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'start' => '<head>', |
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'end' => '</head>', |
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'content' => array(), |
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), |
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'body' => array( |
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'start' => '<body>', |
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'end' => '</body>', |
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'content' => array(), |
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), |
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); |
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/** |
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* What root element did we last add to. |
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* |
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* @var string|null |
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*/ |
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protected $previousKey = null; |
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/** |
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* Parse a HTML document. |
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* |
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* @param string $html |
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* @return void |
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*/ |
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public function loadHtml($html) |
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{ |
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$i = 0; |
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$len = \strlen($html); |
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while ($i < $len) { |
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if ($html[$i] === '<') { |
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// Found a tag, get chars until the end of the tag. |
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$tag = ''; |
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while ($i < $len && $html[$i] !== '>') { |
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$tag .= $html[$i++]; |
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} |
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if ($i < $len && (string) $html[$i] === '>') { |
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$tag .= $html[$i++]; |
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// Copy any whitespace following the tag. |
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// Anything added here needs to be added to the rtrim in the nodeName function. |
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while ($i < $len && \preg_match('/\s/', (string) $html[$i])) { |
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$tag .= $html[$i++]; |
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} |
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} else { |
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// Missing closing tag? |
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$tag .= '>'; |
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} |
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$this->addToTree($tag); |
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} else { |
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$this->addToTree($html[$i++]); |
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} |
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} |
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} |
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/** |
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* Format the document in a structured way (ensures root elements exists and moves scripts/css into <body>). |
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* |
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* @return string |
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*/ |
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public function saveHtml() |
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{ |
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// Initialise buffer. |
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$buffer = ''; |
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// Add <!DOCTYPE> - this is optional. |
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$buffer .= $this->tree['doctype']; |
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// Add <html> |
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$buffer .= $this->tree['html']['start']; |
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// Add head |
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$buffer .= $this->tree['head']['start']; |
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foreach ($this->tree['head']['content'] as $node) { |
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$buffer .= $node; |
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} |
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$buffer .= $this->tree['head']['end']; |
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// Add body |
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$buffer .= $this->tree['body']['start']; |
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foreach ($this->tree['body']['content'] as $node) { |
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$buffer .= $node; |
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} |
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$buffer .= $this->tree['body']['end']; |
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// Close </html> tag |
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return $buffer . $this->tree['html']['end']; |
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} |
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/** |
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* Add a node into the tree for the correct parent. |
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* |
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* @param string $node |
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* @return void |
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*/ |
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protected function addToTree($node) |
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{ |
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if ($node[0] == '<') { |
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switch (\strtolower($this->nodeName($node))) { |
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case '!doctype': |
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if (empty($this->tree['doctype'])) { |
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$this->tree['doctype'] = $node; |
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return; |
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} |
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// Don't overwrite if we've already got a doctype definition. |
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return; |
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case 'html': |
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$this->addTo('html', $node, false); |
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return; |
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case 'head': |
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$this->addTo('head', $node, true); |
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return; |
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default: |
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$this->addTo(isset($this->previousKey) ? $this->previousKey : 'body', $node, true); |
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return; |
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} |
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} |
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// text node |
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$this->addTo(isset($this->previousKey) ? $this->previousKey : 'body', $node, true); |
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} |
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/** |
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* Add a node to the the tree. |
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* |
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* @param string $key |
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* @param string $node |
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* @param bool $setPrevious |
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* @return void |
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*/ |
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protected function addTo($key, $node, $setPrevious) |
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{ |
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$previousKey = $key; |
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if (\stripos($node, '<' . $key) !== false) { |
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$this->tree[$key]['start'] = $node; |
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} elseif (\stristr($node, '/' . $key . '>')) { |
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$this->tree[$key]['end'] = $node; |
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$previousKey = null; |
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} else { |
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$this->tree[$key]['content'][] = $node; |
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} |
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if ($setPrevious) { |
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$this->previousKey = $previousKey; |
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} |
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} |
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/** |
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* Get the name of a node without </> |
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* |
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* @param string $node |
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* @return string |
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*/ |
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protected function nodeName($node) |
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{ |
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$name = \preg_replace('/>\s*/', '', \ltrim($node, '</')); |
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$chunks = \explode(' ', $name); |
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return $chunks[0]; |
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} |
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} |
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Masterminds /
html5-php
