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PipelineStage.php
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PipelineStage.php
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<?php
declare( strict_types = 1 );
namespace Wikimedia\Parsoid\Wt2Html;
use Generator;
use Wikimedia\Parsoid\Config\Env;
use Wikimedia\Parsoid\DOM\Document;
use Wikimedia\Parsoid\Tokens\SourceRange;
use Wikimedia\Parsoid\Wt2Html\TT\TokenHandler;
/**
* This represents the abstract interface for a wt2html parsing pipeline stage
* Currently there are 4 known pipeline stages:
* - PEG Tokenizer
* - Token Transform Manager
* - HTML5 Tree Builder
* - DOM Post Processor
*
* The Token Transform Manager could eventually go away and be directly replaced by
* the very many token transformers that are represented by the abstract TokenHandler class.
*/
abstract class PipelineStage {
/**
* Previous pipeline stage that generates input for this stage.
* Will be null for the first pipeline stage.
* @var ?PipelineStage
*/
protected $prevStage;
/**
* This is primarily a debugging aid.
* @var int
*/
protected $pipelineId = -1;
/** @var Env */
protected $env = null;
/** Defaults to false and resetState initializes it */
protected bool $atTopLevel = false;
protected bool $toFragment = true;
/** @var Frame */
protected $frame;
public function __construct( Env $env, ?PipelineStage $prevStage = null ) {
$this->env = $env;
$this->prevStage = $prevStage;
}
public function setPipelineId( int $id ): void {
$this->pipelineId = $id;
}
public function getPipelineId(): int {
return $this->pipelineId;
}
public function getEnv(): Env {
return $this->env;
}
/**
* Register a token transformer
* @param TokenHandler $t
*/
public function addTransformer( TokenHandler $t ): void {
throw new \BadMethodCallException( "This pipeline stage doesn't accept token transformers." );
}
/**
* Resets any internal state for this pipeline stage.
* This is usually called so a cached pipeline can be reused.
*
* @param array $options
*/
public function resetState( array $options ): void {
/* Default implementation */
$this->atTopLevel = $options['toplevel'] ?? false;
$this->toFragment = $options['toFragment'] ?? true;
}
/**
* Set frame on this pipeline stage
* @param Frame $frame Pipeline frame
*/
public function setFrame( Frame $frame ): void {
$this->frame = $frame;
}
/**
* Set the source offsets for the content being processing by this pipeline
* This matters for when a substring of the top-level page is being processed
* in its own pipeline. This ensures that all source offsets assigned to tokens
* and DOM nodes in this stage are relative to the top-level page.
*
* @param SourceRange $so
*/
public function setSourceOffsets( SourceRange $so ): void {
/* Default implementation: Do nothing */
}
/**
* Process wikitext, an array of tokens, or a DOM document depending on
* what pipeline stage this is. This will be entirety of the input that
* will be processed by this pipeline stage and no further input or an EOF
* signal will follow.
*
* @param string|array|Document $input
* @param array{sol:bool} $options
* - atTopLevel: (bool) Whether we are processing the top-level document
* - sol: (bool) Whether input should be processed in start-of-line context
* - chunky (bool) Whether we are processing the input chunkily.
* @return array|Document
*/
abstract public function process( $input, array $options );
/**
* Process wikitext, an array of tokens, or a DOM document depending on
* what pipeline stage this is. This method will either directly or indirectly
* implement a generator that parses the input in chunks and yields output
* in chunks as well.
*
* Implementations that don't consume tokens (ex: Tokenizer, DOMPostProcessor)
* will provide specialized implementations that handle their input type.
*
* @param string|array|Document $input
* @param array{sol:bool} $options
* - atTopLevel: (bool) Whether we are processing the top-level document
* - sol: (bool) Whether input should be processed in start-of-line context
* @return Generator
*/
abstract public function processChunkily(
$input, array $options
): Generator;
}

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