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HTML API: ANSI-terminal HTML highlighter. #6045

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HTML API: ANSI-terminal HTML highlighter. #6045

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146 changes: 146 additions & 0 deletions highlight-html.php
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Original file line number Diff line number Diff line change
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<?php

require_once __DIR__ . '/src/wp-load.php';

define( 'C_TEXT', "\e[m" );
define( 'C_REF', "\e[38;2;154;110;58m" );
define( 'C_COMMENT', "\e[38;2;112;128;144m" );
define( 'C_SYNTAX', "\e[38;2;153;153;153m" );
define( 'C_TAGNAME', "\e[38;2;153;0;85m" );
define( 'C_ANAME', "\e[38;2;102;153;0m" );
define( 'C_AVALUE', "\e[38;2;0;119;170m" );

$options = getopt( 'fu:' ); // How rude!
$do_format = isset( $options['f'] );

$uri = 'php://stdin';
if ( isset( $options['u'] ) ) {
$uri = $options['u'];
if ( ! preg_match( '~^https?://~', $uri ) ) {
$uri = "https://{$uri}";
}
}

$html = file_get_contents( $uri );

$p = new WP_HTML_Tag_Processor( $html );
while ( $p->next_token() ) {
switch ( $p->get_token_type() ) {
case '#comment':

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echo C_COMMENT . '<!--' . $p->get_modifiable_text() . '-->';

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break;

case '#doctype':

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echo C_SYNTAX . '<!DOCTYPE' . $p->get_modifiable_text() . '>';

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break;

case '#tag':

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print_tag( $p );

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break;

case '#text':

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print_text( $p );

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break;

default:

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die( "Unsupported syntax: {$p->get_token_type()}" );
}
}

echo "\e[m\n";

function print_text( $p ) {
$text = $p->get_modifiable_text();
$text = preg_replace_callback(
'~&(?:#\d+|#x[a-f0-9]+|[a-z]+);?~i',
fn ( $m ) => C_REF . $m[0] . C_TEXT,
$text
);

echo C_TEXT . $text;;

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}

function print_tag( $p ) {
global $do_format;

static $depth = 0;

$tag_name = $p->get_tag();
$is_closer = $p->is_tag_closer();
$closer = $is_closer ? '/' : '';
$is_void = WP_HTML_Processor::is_void( $tag_name );
$voider = $is_void ? '/' : '';

if ( $is_closer && in_array( $tag_name, [ 'HEAD', 'BODY', 'OL', 'UL', 'DIV' ], true ) ) {
$depth--;
}

$indent = str_pad( '', $depth * 2, ' ' );

if ( $do_format && (
(
! $is_closer && in_array( $tag_name, [
'DIV', 'P', 'UL', 'OL', 'DETAILS', 'SVG', 'PATH', 'G',
'LINK', 'META', 'HTML', 'HEAD', 'BODY', 'TITLE', 'TEXTAREA',
'PRE', 'H1', 'H2', 'H3', 'H4', 'H5', 'H6', 'HGROUP',
'PICTURE', 'SOURCE', 'FIGURE', 'FORM', 'TABLE', 'TR',
'FIGCAPTION', 'BLOCKQUOTE', 'OBJECT', 'EMBED', 'IFRAME',
'SCRIPT', 'STYLE', 'NOSCRIPT', 'NAV', 'LI'
], true )
) || (
$is_closer && in_array( $tag_name, [
'HEAD', 'HTML', 'BODY', 'PICTURE', 'FIGURE', 'TABLE'
], true )
)
) ) {
echo "\n{$indent}";
}
echo C_SYNTAX . '<' . $closer;

echo C_TAGNAME . strtolower( $p->get_tag() );
$attributes = $p->get_attribute_names_with_prefix( '' ) ?? array();

foreach( $attributes as $name ) {
$value = $p->get_attribute( $name );

echo ' ' . C_ANAME . $name;
if ( true === $value ) {
continue;
}

echo C_SYNTAX . '="';
echo C_AVALUE . str_replace( '"', '&quot;', $value );
echo C_SYNTAX . '"';
}
echo C_SYNTAX . '>';

$text = $p->get_modifiable_text();
if ( ! empty( $text ) ) {
echo 'TITLE' === $p->get_tag() ? C_TEXT : C_COMMENT;

$add_newlines = (
$do_format &&
strlen( trim( $text ) ) > 0 &&
(
'SCRIPT' === $tag_name ||
'STYLE' === $tag_name ||
'TEXTAREA' === $tag_name ||
'PRE' === $tag_name
)
);

if ( $add_newlines ) {
echo "\n" . trim( $text, "\n" ) . "\n";
} else {
echo $text;
}

echo C_SYNTAX . '</' . C_TAGNAME . strtolower( $p->get_tag() ) . C_SYNTAX . '>';
} elseif ( in_array( $tag_name, [ 'SCRIPT', 'STYLE', 'TEXTAREA', 'PRE' ], true ) ) {
echo C_SYNTAX . '</' . C_TAGNAME . strtolower( $p->get_tag() ) . C_SYNTAX . '>';
}

if ( ! $is_closer && in_array( $tag_name, [ 'HEAD', 'BODY', 'OL', 'UL', 'DIV' ], true ) ) {
$depth++;
}
}
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