DefaultTracer.php
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DefaultTracer.php
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	<?php

	namespace Wikimedia\WikiPEG;

	use InvalidArgumentException;

	class DefaultTracer implements Tracer {
	private $indentLevel = 0;

	public function trace( $event ) {
	switch ( $event['type'] ) {
	case 'rule.enter':
	$this->log( $event );
	$this->indentLevel++;
	break;

	case 'rule.match':
	$this->indentLevel--;
	$this->log( $event );
	break;

	case 'rule.fail':
	$this->indentLevel--;
	$this->log( $event );
	break;

	default:
	throw new InvalidArgumentException( "Invalid event type {$event['type']}" );
	}
	}

	private function log( $event ) {
	print str_pad(
	'' . $event['location'],
	20
	)
	. str_pad( $event['type'], 10 ) . ' '
	. str_repeat( ' ', $this->indentLevel ) . $event['rule']
	. $this->formatArgs( $event['args'] ?? null )
	. "\n";
	}

	private function formatArgs( $argMap ) {
	if ( !$argMap ) {
	return '';
	}

	$argParts = [];
	foreach ( $argMap as $argName => $argValue ) {
	if ( $argName === '$silence' ) {
	continue;
	}
	if ( $argName === '$boolParams' ) {
	$argParts[] = '0x' . base_convert( $argValue, 10, 16 );
	} else {
	$displayName = str_replace( '$param_', '', $argName );
	if ( $displayName[0] === '&' ) {
	$displayName = substr( $displayName, 1 );
	$ref = '&';
	} else {
	$ref = '';
	}
	$argParts[] = "$displayName=$ref" .
	json_encode( $argValue, JSON_UNESCAPED_SLASHES \| JSON_UNESCAPED_UNICODE );
	}
	}
	if ( $argParts ) {
	return '<' . implode( ', ', $argParts ) . '>';
	} else {
	return '';
	}
	}
	}