<?php
/**
* @package s9e\TextFormatter
* @copyright Copyright (c) 2010-2021 The s9e authors
* @license http://www.opensource.org/licenses/mit-license.php The MIT License
*/
namespace s9e\TextFormatter\Configurator\Items;
use InvalidArgumentException;
use s9e\TextFormatter\Configurator\ConfigProvider;
use s9e\TextFormatter\Configurator\FilterableConfigValue;
use s9e\TextFormatter\Configurator\Helpers\RegexpParser;
use s9e\TextFormatter\Configurator\JavaScript\Code;
use s9e\TextFormatter\Configurator\JavaScript\RegexpConvertor;
class Regexp implements ConfigProvider, FilterableConfigValue
{
/**
* @var bool Whether this regexp should have the global flag set in JavaScript
*/
protected $isGlobal;
/**
* @var string JavaScript regexp, with delimiters and modifiers, e.g. "/foo/i"
*/
protected $jsRegexp;
/**
* @var string PCRE regexp, with delimiters and modifiers, e.g. "/foo/i"
*/
protected $regexp;
/**
* Constructor
*
* @param string $regexp PCRE regexp, with delimiters and modifiers, e.g. "/foo/i"
* @param bool $isGlobal Whether this regexp should have the global flag set in JavaScript
*/
public function __construct($regexp, $isGlobal = false)
{
if (@preg_match($regexp, '') === false)
{
throw new InvalidArgumentException('Invalid regular expression ' . var_export($regexp, true));
}
$this->regexp = $regexp;
$this->isGlobal = $isGlobal;
}
/**
* Return this regexp as a string
*
* @return string
*/
public function __toString()
{
return $this->regexp;
}
/**
* {@inheritdoc}
*/
public function asConfig()
{
return $this;
}
/**
* {@inheritdoc}
*/
public function filterConfig($target)
{
return ($target === 'JS') ? new Code($this->getJS()) : (string) $this;
}
/**
* Return the name of each capture in this regexp
*
* @return string[]
*/
public function getCaptureNames()
{
return RegexpParser::getCaptureNames($this->regexp);
}
/**
* Return this regexp's JavaScript representation
*
* @return string
*/
public function getJS()
{
if (!isset($this->jsRegexp))
{
$this->jsRegexp = RegexpConvertor::toJS($this->regexp, $this->isGlobal);
}
return $this->jsRegexp;
}
/**
* Return all the named captures with a standalone regexp that matches them
*
* @return array Array of [capture name => regexp]
*/
public function getNamedCaptures()
{
$captures = [];
$regexpInfo = RegexpParser::parse($this->regexp);
// Prepare the start/end of the regexp and ensure that we use the D modifier
$start = $regexpInfo['delimiter'] . '^';
$end = '$' . $regexpInfo['delimiter'] . $regexpInfo['modifiers'];
if (strpos($regexpInfo['modifiers'], 'D') === false)
{
$end .= 'D';
}
foreach ($this->getNamedCapturesExpressions($regexpInfo['tokens']) as $name => $expr)
{
$captures[$name] = $start . $expr . $end;
}
return $captures;
}
/**
* Return the expression used in each named capture
*
* @param array[] $tokens
* @return array
*/
protected function getNamedCapturesExpressions(array $tokens)
{
$exprs = [];
foreach ($tokens as $token)
{
if ($token['type'] !== 'capturingSubpatternStart' || !isset($token['name']))
{
continue;
}
$expr = $token['content'];
if (strpos($expr, '|') !== false)
{
$expr = '(?:' . $expr . ')';
}
$exprs[$token['name']] = $expr;
}
return $exprs;
}
/**
* Set this regexp's JavaScript representation
*
* @param string $jsRegexp
* @return void
*/
public function setJS($jsRegexp)
{
$this->jsRegexp = $jsRegexp;
}
}