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DispatchTracer.php
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DispatchTracer.php
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<?php
namespace Wikimedia\RemexHtml\TreeBuilder;
use Wikimedia\RemexHtml\Tokenizer\Attributes;
use Wikimedia\RemexHtml\Tokenizer\TokenHandler;
use Wikimedia\RemexHtml\Tokenizer\Tokenizer;
/**
* This is a debugging helper class which calls a callback function with a
* descriptive message each time a token event comes from the Tokenizer. The
* messages include information about the current state and transitions of the
* Dispatcher which is the next stage in the pipeline.
*/
class DispatchTracer implements TokenHandler {
private $input;
private $dispatcher;
private $callback;
public function __construct( $input, Dispatcher $dispatcher, callable $callback ) {
$this->input = $input;
$this->dispatcher = $dispatcher;
$this->callback = $callback;
}
private function trace( $msg ) {
call_user_func( $this->callback, "[Dispatch] $msg" );
}
private function excerpt( $text ) {
if ( strlen( $text ) > 20 ) {
$text = substr( $text, 0, 20 ) . '...';
}
return str_replace( "\n", "\\n", $text );
}
private function wrap( $funcName, $sourceStart, $sourceLength, $args ) {
$prevHandler = $this->getHandlerName();
$excerpt = $this->excerpt( substr( $this->input, $sourceStart, $sourceLength ) );
$msg = "$funcName $prevHandler \"$excerpt\"";
$this->trace( $msg );
call_user_func_array( [ $this->dispatcher, $funcName ], $args );
$handler = $this->getHandlerName();
if ( $prevHandler !== $handler ) {
$this->trace( "$prevHandler -> $handler" );
}
}
private function getHandlerName() {
$handler = $this->dispatcher->getHandler();
$name = $handler ? get_class( $handler ) : 'NULL';
$slashPos = strrpos( $name, '\\' );
if ( $slashPos === false ) {
return $name;
} else {
return substr( $name, $slashPos + 1 );
}
}
public function startDocument( Tokenizer $tokenizer, $ns, $name ) {
$prevHandler = $this->getHandlerName();
$nsMsg = $ns === null ? 'NULL' : $ns;
$nameMsg = $name === null ? 'NULL' : $name;
$this->trace( "startDocument $prevHandler $nsMsg $nameMsg" );
$this->dispatcher->startDocument( $tokenizer, $ns, $name );
$handler = $this->getHandlerName();
if ( $prevHandler !== $handler ) {
$this->trace( "$prevHandler -> $handler" );
}
}
public function endDocument( $pos ) {
$this->wrap( __FUNCTION__, $pos, 0, func_get_args() );
}
public function error( $text, $pos ) {
$handler = $this->getHandlerName();
$this->trace( "error $handler \"$text\"" );
$this->dispatcher->error( $text, $pos );
}
public function characters( $text, $start, $length, $sourceStart, $sourceLength ) {
$this->wrap( __FUNCTION__, $sourceStart, $sourceLength, func_get_args() );
}
public function startTag( $name, Attributes $attrs, $selfClose, $sourceStart, $sourceLength ) {
$this->wrap( __FUNCTION__, $sourceStart, $sourceLength, func_get_args() );
}
public function endTag( $name, $sourceStart, $sourceLength ) {
$this->wrap( __FUNCTION__, $sourceStart, $sourceLength, func_get_args() );
}
public function doctype( $name, $public, $system, $quirks, $sourceStart, $sourceLength ) {
$this->wrap( __FUNCTION__, $sourceStart, $sourceLength, func_get_args() );
}
public function comment( $text, $sourceStart, $sourceLength ) {
$this->wrap( __FUNCTION__, $sourceStart, $sourceLength, func_get_args() );
}
}

File Metadata

Mime Type
text/x-php
Expires
Sat, Oct 3, 14:42 (16 h, 42 m)
Storage Engine
local-disk
Storage Format
Raw Data
Storage Handle
97/c1/0133d41d2986f0d14550410e84b0
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DispatchTracer.php (3 KB)

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