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Experiment: Run the Tag Processor on every tag on output. #5662

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Experiment: Run the Tag Processor on every tag on output. #5662

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93 changes: 93 additions & 0 deletions src/_index.php
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Original file line number Diff line number Diff line change
Expand Up @@ -13,5 +13,98 @@
*/
define( 'WP_USE_THEMES', true );

ob_start( 'dms_everything' );

function dms_parse_url( $url ) {
$url = empty( $url ) ? '' : $url;
$fragment_at = strpos( $url, '#' );
$fragment = false !== $fragment_at ? substr( $url, $fragment_at + 1 ) : '';
$url_without_fragment = false !== $fragment_at ? substr( $url, 0, $fragment_at ) : $url;
$query_at = strpos( $url_without_fragment, '?' );

$query = false !== $query_at ? substr( $url_without_fragment, $query_at + 1 ) : '';
$pairs = explode( '&', $query );
$args = [];
foreach ( $pairs as $pair ) {
if ( '' === $pair ) {
continue;
}
if ( false === strpos( $pair, '=' ) ) {
$args[ $pair ] = true;
} else {
list( $key, $value ) = explode( '=', $pair );
$args[ $key ] = urldecode( $value );
}
}

$url_without_query = false !== $query_at ? substr( $url_without_fragment, 0, $query_at ) : $url_without_fragment;
$is_relative = 0 === strlen( $url_without_query ) || '/' === $url_without_query[0];
$has_schema = preg_match( '~^([a-z]+)://~i', $url_without_query, $schema_match );
$schema = $has_schema ? $schema_match[1] : '';
$domain_path = $has_schema ? substr( $url_without_query, strlen( $schema_match[0] ) ) : $url_without_query;

if ( ! $is_relative ) {
$first_slash = strpos( $domain_path, '/' );
$domain = false !== $first_slash ? substr( $domain_path, 0, $first_slash ) : '';
$path = false !== $first_slash ? substr( $domain_path, $first_slash ) : $domain_path;
} else {
$domain = '';
$path = $domain_path;
}

return [
'schema' => $schema,
'domain' => $domain,
'path' => $path,
'query' => count( $args ) > 0 ? $args : null,
'fragment' => $fragment,
];
}

function dms_everything( $html ) {
$processor = new WP_HTML_Tag_Processor( $html );
$tag_count = 0;
$seen_ids = [];

$errors = [];

while ( $processor->next_tag() ) {
$tag_count++;
$tag_name = $processor->get_tag();

$id = $processor->get_attribute( 'id' );
if ( is_string( $id ) ) {
if ( isset( $seen_ids[ $id ] ) ) {
$errors[] = "Repeated id = <{$tag_name} id=\"{$id}\">; seen first in {$seen_ids[$id]} tag.";
} else {
$seen_ids[ $id ] = $tag_name;
}
}

$src = $processor->get_attribute( 'src' );
if ( is_string( $src ) ) {
$url = dms_parse_url( $src );
$errors[] = "Found URL in <{$tag_name} src=\"{$src}\">.";
$errors[] = print_r( $url, true );
$errors[] = "\n";
}

$href = $processor->get_attribute( 'href' );
if ( is_string( $href ) ) {
$url = dms_parse_url( $href );
$errors[] = "Found URL in <{$tag_name} href=\"{$href}\">.";
$errors[] = print_r( $url, true );
$errors[] = "\n";
}
}

return $html;
// return count( $errors ) > 0
// ? '<plaintext>' . "Found {$tag_count} tags.\n\n" . implode( "\n", array_map( function( $e ) { return print_r( $e, true ); }, $errors ) )
// : $html;
}

/** Loads the WordPress Environment and Template */
require __DIR__ . '/wp-blog-header.php';

ob_end_flush();