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<?php |
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/** |
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* Created by PhpStorm. |
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* @author domenico [email protected] / [email protected] |
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* Date: 05/11/18 |
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* Time: 15.30 |
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* |
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*/ |
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namespace Matecat\SubFiltering\Filters\Html; |
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use Matecat\SubFiltering\Commons\Pipeline; |
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use ReflectionException; |
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use ReflectionMethod; |
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use RuntimeException; |
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/** |
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* Class HtmlToPh |
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* |
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* Based on the code https://github.com/ericnorris/striptags |
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* Rewritten/Improved and Changed for PHP |
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* |
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* @author domenico [email protected] / [email protected] |
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* @package SubFiltering |
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* |
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* @method _isTagValid( string $buffer ) |
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* @method _finalizeHTMLTag( string $buffer ) |
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* @method _fixWrongBuffer( string $buffer ) |
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* @method _finalizeScriptTag( string $buffer ) |
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* @method _finalizePlainText( string $plain_text_buffer ) |
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* @method _setSegmentContainsHtml() |
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*/ |
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class HtmlParser { |
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const STATE_PLAINTEXT = 0; |
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const STATE_HTML = 1; |
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const STATE_COMMENT = 2; |
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const STATE_JS_CSS = 3; |
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/** |
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* @var Pipeline |
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*/ |
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private $pipeline; |
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/** |
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* HtmlParser constructor. |
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* |
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* @param Pipeline $pipeline |
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*/ |
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public function __construct( Pipeline $pipeline = null ) { |
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$this->pipeline = $pipeline; |
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} |
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/** |
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* @var CallbacksHandler |
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*/ |
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protected $callbacksHandler; |
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93 |
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public function registerCallbacksHandler( $class ) { |
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//check: $class must use CallbacksHandler trait |
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if ( !in_array( CallbacksHandler::class, class_uses( $class ) ) ) { |
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throw new RuntimeException( "Class passed to " . __METHOD__ . " must use " . CallbacksHandler::class . " trait." ); |
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} |
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$this->callbacksHandler = $class; |
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} |
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/** |
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* @param $name |
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* @param $arguments |
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* |
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* @return mixed |
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* @throws ReflectionException |
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*/ |
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public function __call( $name, $arguments ) { |
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if ( $this->callbacksHandler !== null ) { |
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//Reflection to allow protected/private methods to be set as callback |
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$reflector = new ReflectionMethod( $this->callbacksHandler, $name ); |
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if ( !$reflector->isPublic() ) { |
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$reflector->setAccessible( true ); |
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} |
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return $reflector->invoke( $this->callbacksHandler, $arguments[ 0 ] ); |
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} |
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return null; |
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} |
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public function transform( $segment ) { |
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$originalSplit = preg_split( '//u', $segment, -1, PREG_SPLIT_NO_EMPTY ); |
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$state = static::STATE_PLAINTEXT; |
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$html_buffer = ''; |
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$plain_text_buffer = ''; |
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$in_quote_char = ''; |
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$output = ''; |
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foreach ( $originalSplit as $idx => $char ) { |
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if ( $state == static::STATE_PLAINTEXT ) { |
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switch ( $char ) { |
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case '<': |
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$state = static::STATE_HTML; |
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$html_buffer .= $char; |
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$output .= $this->_finalizePlainText( $plain_text_buffer ); |
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$plain_text_buffer = ''; |
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break; |
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// |
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// ************************************* |
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// NOTE 2021-06-15 |
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// ************************************* |
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// |
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// This case covers simple greater than sign (>), |
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// otherwise is ignored and leaved as >. |
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// |
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case '>': |
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$plain_text_buffer .= $this->_fixWrongBuffer( $char ); |
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break; |
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default: |
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$plain_text_buffer .= $char; |
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break; |
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} |
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} elseif ( $state == static::STATE_HTML ) { |
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switch ( $char ) { |
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case '<': |
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// is not possible to have angle brackets inside a tag, this case can not happen |
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// this code would ignore '>' if inside a quote, useless |
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// for more info see https://www.w3.org/TR/xml/#charsets |
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// if we found a second less than symbol the first one IS NOT a tag, |
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// treat the html_buffer as plain text and attach to the output |
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$output .= $this->_fixWrongBuffer( $html_buffer ); |
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$html_buffer = $char; |
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break; |
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case '>': |
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// is not possible to have angle brackets inside a tag, this case can not happen |
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// this code would ignore '>' if inside a quote, useless |
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// for more info see https://www.w3.org/TR/xml/#charsets |
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if ( in_array( substr( $html_buffer, 0, 8 ), [ '<script ', '<style', '<script', '<style ' ] ) ) { |
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$html_buffer .= $char; |
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$state = static::STATE_JS_CSS; |
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break; |
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} |
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// this is closing the tag in tag_buffer |
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$in_quote_char = ''; |
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$state = static::STATE_PLAINTEXT; |
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$html_buffer .= $char; |
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if ( $this->_isTagValid( $html_buffer ) ) { |
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$output .= $this->_finalizeHTMLTag( $html_buffer ); |
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} else { |
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$output .= $this->_fixWrongBuffer( $html_buffer ); |
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} |
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if ( $this->_isTagValid( $html_buffer ) and null !== $this->pipeline ) { |
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$this->_setSegmentContainsHtml(); |
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} |
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$html_buffer = ''; |
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break; |
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case '"': |
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case '\'': |
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// catch both single and double quotes |
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if ( $char == $in_quote_char ) { |
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$in_quote_char = ''; |
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} else { |
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$in_quote_char = ( !empty( $in_quote_char ) ? $in_quote_char : $char ); |
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} |
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$html_buffer .= $char; |
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break; |
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case '-': |
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if ( $html_buffer == '<!-' ) { |
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$state = static::STATE_COMMENT; |
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} |
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$html_buffer .= $char; |
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break; |
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case ' ': //0x20, is a space |
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case '\n': |
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if ( $html_buffer === '<' ) { |
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$state = static::STATE_PLAINTEXT; // but we work in XML text, so encode it |
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$output .= $this->_fixWrongBuffer( '< ' ); |
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$html_buffer = ''; |
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if ( $this->_isTagValid( $html_buffer ) and null !== $this->pipeline ) { |
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$this->_setSegmentContainsHtml(); |
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} |
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break; |
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} |
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$html_buffer .= $char; |
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break; |
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default: |
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// Check the last char |
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if ( $idx === ( count( $originalSplit ) - 1 ) ) { |
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$html_buffer .= $char; |
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// |
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// ************************************* |
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// NOTE 2021-06-16 |
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// ************************************* |
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// |
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// Check if $html_buffer is valid. If not, then |
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// convert it to $plain_text_buffer. |
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// |
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// Example: |
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// |
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// $html_buffer = '<3 %}' |
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// |
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// is not a valid tag, so it's converted to $plain_text_buffer |
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// |
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if ( !$this->_isTagValid( $html_buffer ) ) { |
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$state = static::STATE_PLAINTEXT; // but we work in XML text, so encode it |
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$plain_text_buffer .= $this->_fixWrongBuffer( $html_buffer ); |
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$html_buffer = ''; |
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if ( $this->_isTagValid( $html_buffer ) and null !== $this->pipeline ) { |
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$this->_setSegmentContainsHtml(); |
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} |
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break; |
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} |
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break; |
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} |
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$html_buffer .= $char; |
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break; |
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} |
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} elseif ( $state == static::STATE_COMMENT ) { |
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$html_buffer .= $char; |
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if ( $char == '>' ) { |
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if ( substr( $html_buffer, -3 ) == '-->' ) { |
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// close the comment |
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$state = static::STATE_PLAINTEXT; |
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$output .= $this->_finalizeScriptTag( $html_buffer ); |
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$html_buffer = ''; |
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if ( $this->_isTagValid( $html_buffer ) and null !== $this->pipeline ) { |
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$this->_setSegmentContainsHtml(); |
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} |
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} |
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} |
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3 |
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} elseif ( $state == static::STATE_JS_CSS ) { |
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3 |
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$html_buffer .= $char; |
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3 |
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if ( $char == '>' ) { |
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2 |
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if ( in_array( substr( $html_buffer, -6 ), [ 'cript>', 'style>' ] ) ) { |
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// close the comment |
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$state = static::STATE_PLAINTEXT; |
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$output .= $this->_finalizeScriptTag( $html_buffer ); |
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$html_buffer = ''; |
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if ( $this->_isTagValid( $html_buffer ) and null !== $this->pipeline ) { |
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$this->_setSegmentContainsHtml(); |
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} |
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} |
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} |
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} |
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} |
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//HTML Partial, add wrong HTML to preserve string content |
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if ( !empty( $html_buffer ) ) { |
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1 |
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if ( $this->_isTagValid( $html_buffer ) and null !== $this->pipeline ) { |
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$this->_setSegmentContainsHtml(); |
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} |
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1 |
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$output .= $this->_fixWrongBuffer( $html_buffer ); |
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} |
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//string ends with plain text, so no state change is triggered at the end of string |
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if ( '' !== $plain_text_buffer and null !== $plain_text_buffer ) { |
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$output .= $this->_finalizePlainText( $plain_text_buffer ); |
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} |
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93 |
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return $output; |
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} |
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} |
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matecat /
subfiltering
