RemexStripTagHandler.php

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<?php
 
use RemexHtml\Tokenizer\Attributes;
use RemexHtml\Tokenizer\TokenHandler;
use RemexHtml\Tokenizer\Tokenizer;
 
class RemexStripTagHandler implements TokenHandler {
    private $text = '';
 
    public function getResult() {
        return $this->text;
    }
 
    function startDocument( Tokenizer $t, $fns, $fn ) {
        // Do nothing.
    }
 
    function endDocument( $pos ) {
        // Do nothing.
    }
 
    function error( $text, $pos ) {
        // Do nothing.
    }
 
    function characters( $text, $start, $length, $sourceStart, $sourceLength ) {
        $this->text .= substr( $text, $start, $length );
    }
 
    function startTag( $name, Attributes $attrs, $selfClose, $sourceStart, $sourceLength ) {
        // Inject whitespace for typical block-level tags to
        // prevent merging unrelated<br>words.
        if ( $this->isBlockLevelTag( $name ) ) {
            $this->text .= ' ';
        }
    }
 
    function endTag( $name, $sourceStart, $sourceLength ) {
        // Inject whitespace for typical block-level tags to
        // prevent merging unrelated<br>words.
        if ( $this->isBlockLevelTag( $name ) ) {
            $this->text .= ' ';
        }
    }
 
    function doctype( $name, $public, $system, $quirks, $sourceStart, $sourceLength ) {
        // Do nothing.
    }
 
    function comment( $text, $sourceStart, $sourceLength ) {
        // Do nothing.
    }
 
    // Per https://developer.mozilla.org/en-US/docs/Web/HTML/Block-level_elements
    // retrieved on sept 12, 2018. <br> is not block level but was added anyways.
    // The following is a complete list of all HTML block level elements
    // (although "block-level" is not technically defined for elements that are
    // new in HTML5).
    // Structured as tag => true to allow O(1) membership test.
    private static $BLOCK_LEVEL_TAGS = [
        'address' => true,
        'article' => true,
        'aside' => true,
        'blockquote' => true,
        'br' => true,
        'canvas' => true,
        'dd' => true,
        'div' => true,
        'dl' => true,
        'dt' => true,
        'fieldset' => true,
        'figcaption' => true,
        'figure' => true,
        'footer' => true,
        'form' => true,
        'h1' => true,
        'h2' => true,
        'h3' => true,
        'h4' => true,
        'h5' => true,
        'h6' => true,
        'header' => true,
        'hgroup' => true,
        'hr' => true,
        'li' => true,
        'main' => true,
        'nav' => true,
        'noscript' => true,
        'ol' => true,
        'output' => true,
        'p' => true,
        'pre' => true,
        'section' => true,
        'table' => true,
        'td' => true,
        'tfoot' => true,
        'th' => true,
        'tr' => true,
        'ul' => true,
        'video' => true,
    ];
 
    private function isBlockLevelTag( $tagName ) {
        $key = strtolower( trim( $tagName ) );
        return isset( self::$BLOCK_LEVEL_TAGS[$key] );
    }
}