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<?php
/*
* This file is part of composer/pcre.
*
* (c) Composer <https://github.com/composer>
*
* For the full copyright and license information, please view
* the LICENSE file that was distributed with this source code.
*/
namespace Composer\Pcre;
class Preg
{
/** @internal */
public const ARRAY_MSG = '$subject as an array is not supported. You can use \'foreach\' instead.';
/** @internal */
public const INVALID_TYPE_MSG = '$subject must be a string, %s given.';
/**
* @param non-empty-string $pattern
* @param array<string|null> $matches Set by method
* @param int-mask<PREG_UNMATCHED_AS_NULL> $flags PREG_UNMATCHED_AS_NULL is always set, no other flags are supported
* @return 0|1
*
* @param-out array<int|string, string|null> $matches
*/
public static function match(string $pattern, string $subject, ?array &$matches = null, int $flags = 0, int $offset = 0): int
{
self::checkOffsetCapture($flags, 'matchWithOffsets');
$result = preg_match($pattern, $subject, $matches, $flags | PREG_UNMATCHED_AS_NULL, $offset);
if ($result === false) {
throw PcreException::fromFunction('preg_match', $pattern);
}
return $result;
}
/**
* Variant of `match()` which outputs non-null matches (or throws)
*
* @param non-empty-string $pattern
* @param array<string> $matches Set by method
* @param int-mask<PREG_UNMATCHED_AS_NULL> $flags PREG_UNMATCHED_AS_NULL is always set, no other flags are supported
* @return 0|1
* @throws UnexpectedNullMatchException
*
* @param-out array<int|string, string> $matches
*/
public static function matchStrictGroups(string $pattern, string $subject, ?array &$matches = null, int $flags = 0, int $offset = 0): int
{
$result = self::match($pattern, $subject, $matchesInternal, $flags, $offset);
$matches = self::enforceNonNullMatches($pattern, $matchesInternal, 'match');
return $result;
}
/**
* Runs preg_match with PREG_OFFSET_CAPTURE
*
* @param non-empty-string $pattern
* @param array<int|string, array{string|null, int}> $matches Set by method
* @param int-mask<PREG_UNMATCHED_AS_NULL|PREG_OFFSET_CAPTURE> $flags PREG_UNMATCHED_AS_NULL and PREG_OFFSET_CAPTURE are always set, no other flags are supported
* @return 0|1
*
* @param-out array<int|string, array{string|null, int<-1, max>}> $matches
*/
public static function matchWithOffsets(string $pattern, string $subject, ?array &$matches, int $flags = 0, int $offset = 0): int
{
$result = preg_match($pattern, $subject, $matches, $flags | PREG_UNMATCHED_AS_NULL | PREG_OFFSET_CAPTURE, $offset);
if ($result === false) {
throw PcreException::fromFunction('preg_match', $pattern);
}
return $result;
}
/**
* @param non-empty-string $pattern
* @param array<int|string, list<string|null>> $matches Set by method
* @param int-mask<PREG_UNMATCHED_AS_NULL> $flags PREG_UNMATCHED_AS_NULL is always set, no other flags are supported
* @return 0|positive-int
*
* @param-out array<int|string, list<string|null>> $matches
*/
public static function matchAll(string $pattern, string $subject, ?array &$matches = null, int $flags = 0, int $offset = 0): int
{
self::checkOffsetCapture($flags, 'matchAllWithOffsets');
self::checkSetOrder($flags);
$result = preg_match_all($pattern, $subject, $matches, $flags | PREG_UNMATCHED_AS_NULL, $offset);
if (!is_int($result)) { // PHP < 8 may return null, 8+ returns int|false
throw PcreException::fromFunction('preg_match_all', $pattern);
}
return $result;
}
/**
* Variant of `match()` which outputs non-null matches (or throws)
*
* @param non-empty-string $pattern
* @param array<int|string, list<string|null>> $matches Set by method
* @param int-mask<PREG_UNMATCHED_AS_NULL> $flags PREG_UNMATCHED_AS_NULL is always set, no other flags are supported
* @return 0|positive-int
* @throws UnexpectedNullMatchException
*
* @param-out array<int|string, list<string>> $matches
*/
public static function matchAllStrictGroups(string $pattern, string $subject, ?array &$matches = null, int $flags = 0, int $offset = 0): int
{
$result = self::matchAll($pattern, $subject, $matchesInternal, $flags, $offset);
$matches = self::enforceNonNullMatchAll($pattern, $matchesInternal, 'matchAll');
return $result;
}
/**
* Runs preg_match_all with PREG_OFFSET_CAPTURE
*
* @param non-empty-string $pattern
* @param array<int|string, list<array{string|null, int}>> $matches Set by method
* @param int-mask<PREG_UNMATCHED_AS_NULL|PREG_OFFSET_CAPTURE> $flags PREG_UNMATCHED_AS_NULL and PREG_MATCH_OFFSET are always set, no other flags are supported
* @return 0|positive-int
*
* @phpstan-param array<int|string, list<array{string|null, int<-1, max>}>> $matches
*/
public static function matchAllWithOffsets(string $pattern, string $subject, ?array &$matches, int $flags = 0, int $offset = 0): int
{
self::checkSetOrder($flags);
$result = preg_match_all($pattern, $subject, $matches, $flags | PREG_UNMATCHED_AS_NULL | PREG_OFFSET_CAPTURE, $offset);
if (!is_int($result)) { // PHP < 8 may return null, 8+ returns int|false
throw PcreException::fromFunction('preg_match_all', $pattern);
}
return $result;
}
/**
* @param string|string[] $pattern
* @param string|string[] $replacement
* @param string $subject
* @param int $count Set by method
*
* @param-out int<0, max> $count
*/
public static function replace($pattern, $replacement, $subject, int $limit = -1, int &$count = null): string
{
if (!is_scalar($subject)) {
if (is_array($subject)) {
throw new \InvalidArgumentException(static::ARRAY_MSG);
}
throw new \TypeError(sprintf(static::INVALID_TYPE_MSG, gettype($subject)));
}
$result = preg_replace($pattern, $replacement, $subject, $limit, $count);
if ($result === null) {
throw PcreException::fromFunction('preg_replace', $pattern);
}
return $result;
}
/**
* @param string|string[] $pattern
* @param callable(array<int|string, string|null>): string $replacement
* @param string $subject
* @param int $count Set by method
* @param int-mask<PREG_UNMATCHED_AS_NULL|PREG_OFFSET_CAPTURE> $flags PREG_OFFSET_CAPTURE is supported, PREG_UNMATCHED_AS_NULL is always set
*
* @param-out int<0, max> $count
*/
public static function replaceCallback($pattern, callable $replacement, $subject, int $limit = -1, int &$count = null, int $flags = 0): string
{
if (!is_scalar($subject)) {
if (is_array($subject)) {
throw new \InvalidArgumentException(static::ARRAY_MSG);
}
throw new \TypeError(sprintf(static::INVALID_TYPE_MSG, gettype($subject)));
}
$result = preg_replace_callback($pattern, $replacement, $subject, $limit, $count, $flags | PREG_UNMATCHED_AS_NULL);
if ($result === null) {
throw PcreException::fromFunction('preg_replace_callback', $pattern);
}
return $result;
}
/**
* Variant of `replaceCallback()` which outputs non-null matches (or throws)
*
* @param string $pattern
* @param callable(array<int|string, string>): string $replacement
* @param string $subject
* @param int $count Set by method
* @param int-mask<PREG_UNMATCHED_AS_NULL|PREG_OFFSET_CAPTURE> $flags PREG_OFFSET_CAPTURE or PREG_UNMATCHED_AS_NULL, only available on PHP 7.4+
*
* @param-out int<0, max> $count
*/
public static function replaceCallbackStrictGroups(string $pattern, callable $replacement, $subject, int $limit = -1, int &$count = null, int $flags = 0): string
{
return self::replaceCallback($pattern, function (array $matches) use ($pattern, $replacement) {
return $replacement(self::enforceNonNullMatches($pattern, $matches, 'replaceCallback'));
}, $subject, $limit, $count, $flags);
}
/**
* @param array<string, callable(array<int|string, string|null>): string> $pattern
* @param string $subject
* @param int $count Set by method
* @param int-mask<PREG_UNMATCHED_AS_NULL|PREG_OFFSET_CAPTURE> $flags PREG_OFFSET_CAPTURE is supported, PREG_UNMATCHED_AS_NULL is always set
*
* @param-out int<0, max> $count
*/
public static function replaceCallbackArray(array $pattern, $subject, int $limit = -1, int &$count = null, int $flags = 0): string
{
if (!is_scalar($subject)) {
if (is_array($subject)) {
throw new \InvalidArgumentException(static::ARRAY_MSG);
}
throw new \TypeError(sprintf(static::INVALID_TYPE_MSG, gettype($subject)));
}
$result = preg_replace_callback_array($pattern, $subject, $limit, $count, $flags | PREG_UNMATCHED_AS_NULL);
if ($result === null) {
$pattern = array_keys($pattern);
throw PcreException::fromFunction('preg_replace_callback_array', $pattern);
}
return $result;
}
/**
* @param int-mask<PREG_SPLIT_NO_EMPTY|PREG_SPLIT_DELIM_CAPTURE|PREG_SPLIT_OFFSET_CAPTURE> $flags PREG_SPLIT_NO_EMPTY or PREG_SPLIT_DELIM_CAPTURE
* @return list<string>
*/
public static function split(string $pattern, string $subject, int $limit = -1, int $flags = 0): array
{
if (($flags & PREG_SPLIT_OFFSET_CAPTURE) !== 0) {
throw new \InvalidArgumentException('PREG_SPLIT_OFFSET_CAPTURE is not supported as it changes the type of $matches, use splitWithOffsets() instead');
}
$result = preg_split($pattern, $subject, $limit, $flags);
if ($result === false) {
throw PcreException::fromFunction('preg_split', $pattern);
}
return $result;
}
/**
* @param int-mask<PREG_SPLIT_NO_EMPTY|PREG_SPLIT_DELIM_CAPTURE|PREG_SPLIT_OFFSET_CAPTURE> $flags PREG_SPLIT_NO_EMPTY or PREG_SPLIT_DELIM_CAPTURE, PREG_SPLIT_OFFSET_CAPTURE is always set
* @return list<array{string, int}>
* @phpstan-return list<array{string, int<0, max>}>
*/
public static function splitWithOffsets(string $pattern, string $subject, int $limit = -1, int $flags = 0): array
{
$result = preg_split($pattern, $subject, $limit, $flags | PREG_SPLIT_OFFSET_CAPTURE);
if ($result === false) {
throw PcreException::fromFunction('preg_split', $pattern);
}
return $result;
}
/**
* @template T of string|\Stringable
* @param string $pattern
* @param array<T> $array
* @param int-mask<PREG_GREP_INVERT> $flags PREG_GREP_INVERT
* @return array<T>
*/
public static function grep(string $pattern, array $array, int $flags = 0): array
{
$result = preg_grep($pattern, $array, $flags);
if ($result === false) {
throw PcreException::fromFunction('preg_grep', $pattern);
}
return $result;
}
/**
* Variant of match() which returns a bool instead of int
*
* @param non-empty-string $pattern
* @param array<string|null> $matches Set by method
* @param int-mask<PREG_UNMATCHED_AS_NULL> $flags PREG_UNMATCHED_AS_NULL is always set, no other flags are supported
*
* @param-out array<int|string, string|null> $matches
*/
public static function isMatch(string $pattern, string $subject, ?array &$matches = null, int $flags = 0, int $offset = 0): bool
{
return (bool) static::match($pattern, $subject, $matches, $flags, $offset);
}
/**
* Variant of `isMatch()` which outputs non-null matches (or throws)
*
* @param non-empty-string $pattern
* @param array<string> $matches Set by method
* @param int-mask<PREG_UNMATCHED_AS_NULL> $flags PREG_UNMATCHED_AS_NULL is always set, no other flags are supported
* @throws UnexpectedNullMatchException
*
* @param-out array<int|string, string> $matches
*/
public static function isMatchStrictGroups(string $pattern, string $subject, ?array &$matches = null, int $flags = 0, int $offset = 0): bool
{
return (bool) self::matchStrictGroups($pattern, $subject, $matches, $flags, $offset);
}
/**
* Variant of matchAll() which returns a bool instead of int
*
* @param non-empty-string $pattern
* @param array<int|string, list<string|null>> $matches Set by method
* @param int-mask<PREG_UNMATCHED_AS_NULL> $flags PREG_UNMATCHED_AS_NULL is always set, no other flags are supported
*
* @param-out array<int|string, list<string|null>> $matches
*/
public static function isMatchAll(string $pattern, string $subject, ?array &$matches = null, int $flags = 0, int $offset = 0): bool
{
return (bool) static::matchAll($pattern, $subject, $matches, $flags, $offset);
}
/**
* Variant of `isMatchAll()` which outputs non-null matches (or throws)
*
* @param non-empty-string $pattern
* @param array<int|string, list<string>> $matches Set by method
* @param int-mask<PREG_UNMATCHED_AS_NULL> $flags PREG_UNMATCHED_AS_NULL is always set, no other flags are supported
*
* @param-out array<int|string, list<string>> $matches
*/
public static function isMatchAllStrictGroups(string $pattern, string $subject, ?array &$matches = null, int $flags = 0, int $offset = 0): bool
{
return (bool) self::matchAllStrictGroups($pattern, $subject, $matches, $flags, $offset);
}
/**
* Variant of matchWithOffsets() which returns a bool instead of int
*
* Runs preg_match with PREG_OFFSET_CAPTURE
*
* @param non-empty-string $pattern
* @param array<int|string, array{string|null, int}> $matches Set by method
* @param int-mask<PREG_UNMATCHED_AS_NULL> $flags PREG_UNMATCHED_AS_NULL is always set, no other flags are supported
*
* @param-out array<int|string, array{string|null, int<-1, max>}> $matches
*/
public static function isMatchWithOffsets(string $pattern, string $subject, ?array &$matches, int $flags = 0, int $offset = 0): bool
{
return (bool) static::matchWithOffsets($pattern, $subject, $matches, $flags, $offset);
}
/**
* Variant of matchAllWithOffsets() which returns a bool instead of int
*
* Runs preg_match_all with PREG_OFFSET_CAPTURE
*
* @param non-empty-string $pattern
* @param array<int|string, list<array{string|null, int}>> $matches Set by method
* @param int-mask<PREG_UNMATCHED_AS_NULL> $flags PREG_UNMATCHED_AS_NULL is always set, no other flags are supported
*
* @param-out array<int|string, list<array{string|null, int<-1, max>}>> $matches
*/
public static function isMatchAllWithOffsets(string $pattern, string $subject, ?array &$matches, int $flags = 0, int $offset = 0): bool
{
return (bool) static::matchAllWithOffsets($pattern, $subject, $matches, $flags, $offset);
}
private static function checkOffsetCapture(int $flags, string $useFunctionName): void
{
if (($flags & PREG_OFFSET_CAPTURE) !== 0) {
throw new \InvalidArgumentException('PREG_OFFSET_CAPTURE is not supported as it changes the type of $matches, use ' . $useFunctionName . '() instead');
}
}
private static function checkSetOrder(int $flags): void
{
if (($flags & PREG_SET_ORDER) !== 0) {
throw new \InvalidArgumentException('PREG_SET_ORDER is not supported as it changes the type of $matches');
}
}
/**
* @param array<int|string, string|null> $matches
* @return array<int|string, string>
* @throws UnexpectedNullMatchException
*/
private static function enforceNonNullMatches(string $pattern, array $matches, string $variantMethod)
{
foreach ($matches as $group => $match) {
if (null === $match) {
throw new UnexpectedNullMatchException('Pattern "'.$pattern.'" had an unexpected unmatched group "'.$group.'", make sure the pattern always matches or use '.$variantMethod.'() instead.');
}
}
/** @var array<string> */
return $matches;
}
/**
* @param array<int|string, list<string|null>> $matches
* @return array<int|string, list<string>>
* @throws UnexpectedNullMatchException
*/
private static function enforceNonNullMatchAll(string $pattern, array $matches, string $variantMethod)
{
foreach ($matches as $group => $groupMatches) {
foreach ($groupMatches as $match) {
if (null === $match) {
throw new UnexpectedNullMatchException('Pattern "'.$pattern.'" had an unexpected unmatched group "'.$group.'", make sure the pattern always matches or use '.$variantMethod.'() instead.');
}
}
}
/** @var array<int|string, list<string>> */
return $matches;
}
}
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