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<?php declare(strict_types=1);
/*
* This file is part of Composer.
*
* (c) Nils Adermann <naderman@naderman.de>
* Jordi Boggiano <j.boggiano@seld.be>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Composer\ClassMapGenerator;
use Composer\Pcre\Preg;
/**
* @author Jordi Boggiano <j.boggiano@seld.be>
* @internal
*/
class PhpFileCleaner
{
/** @var array<array{name: string, length: int, pattern: non-empty-string}> */
private static $typeConfig;
/** @var non-empty-string */
private static $restPattern;
/**
* @readonly
* @var string
*/
private $contents;
/**
* @readonly
* @var int
*/
private $len;
/**
* @readonly
* @var int
*/
private $maxMatches;
/** @var int */
private $index = 0;
/**
* @param string[] $types
*/
public static function setTypeConfig(array $types): void
{
foreach ($types as $type) {
self::$typeConfig[$type[0]] = array(
'name' => $type,
'length' => \strlen($type),
'pattern' => '{.\b(?<![\$:>])'.$type.'\s++[a-zA-Z_\x7f-\xff:][a-zA-Z0-9_\x7f-\xff:\-]*+}Ais',
);
}
self::$restPattern = '{[^?"\'</'.implode('', array_keys(self::$typeConfig)).']+}A';
}
public function __construct(string $contents, int $maxMatches)
{
$this->contents = $contents;
$this->len = \strlen($this->contents);
$this->maxMatches = $maxMatches;
}
public function clean(): string
{
$clean = '';
while ($this->index < $this->len) {
$this->skipToPhp();
$clean .= '<?';
while ($this->index < $this->len) {
$char = $this->contents[$this->index];
if ($char === '?' && $this->peek('>')) {
$clean .= '?>';
$this->index += 2;
continue 2;
}
if ($char === '"') {
$this->skipString('"');
$clean .= 'null';
continue;
}
if ($char === "'") {
$this->skipString("'");
$clean .= 'null';
continue;
}
if ($char === "<" && $this->peek('<') && $this->match('{<<<[ \t]*+([\'"]?)([a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*+)\\1(?:\r\n|\n|\r)}A', $match)) {
$this->index += \strlen($match[0]);
$this->skipHeredoc($match[2]);
$clean .= 'null';
continue;
}
if ($char === '/') {
if ($this->peek('/')) {
$this->skipToNewline();
continue;
}
if ($this->peek('*')) {
$this->skipComment();
continue;
}
}
if ($this->maxMatches === 1 && isset(self::$typeConfig[$char])) {
$type = self::$typeConfig[$char];
if (
\substr($this->contents, $this->index, $type['length']) === $type['name']
&& Preg::isMatch($type['pattern'], $this->contents, $match, 0, $this->index - 1)
) {
$clean .= $match[0];
return $clean;
}
}
$this->index += 1;
if ($this->match(self::$restPattern, $match)) {
$clean .= $char . $match[0];
$this->index += \strlen($match[0]);
} else {
$clean .= $char;
}
}
}
return $clean;
}
private function skipToPhp(): void
{
while ($this->index < $this->len) {
if ($this->contents[$this->index] === '<' && $this->peek('?')) {
$this->index += 2;
break;
}
$this->index += 1;
}
}
private function skipString(string $delimiter): void
{
$this->index += 1;
while ($this->index < $this->len) {
if ($this->contents[$this->index] === '\\' && ($this->peek('\\') || $this->peek($delimiter))) {
$this->index += 2;
continue;
}
if ($this->contents[$this->index] === $delimiter) {
$this->index += 1;
break;
}
$this->index += 1;
}
}
private function skipComment(): void
{
$this->index += 2;
while ($this->index < $this->len) {
if ($this->contents[$this->index] === '*' && $this->peek('/')) {
$this->index += 2;
break;
}
$this->index += 1;
}
}
private function skipToNewline(): void
{
while ($this->index < $this->len) {
if ($this->contents[$this->index] === "\r" || $this->contents[$this->index] === "\n") {
return;
}
$this->index += 1;
}
}
private function skipHeredoc(string $delimiter): void
{
$firstDelimiterChar = $delimiter[0];
$delimiterLength = \strlen($delimiter);
$delimiterPattern = '{'.preg_quote($delimiter).'(?![a-zA-Z0-9_\x80-\xff])}A';
while ($this->index < $this->len) {
// check if we find the delimiter after some spaces/tabs
switch ($this->contents[$this->index]) {
case "\t":
case " ":
$this->index += 1;
continue 2;
case $firstDelimiterChar:
if (
\substr($this->contents, $this->index, $delimiterLength) === $delimiter
&& $this->match($delimiterPattern)
) {
$this->index += $delimiterLength;
return;
}
break;
}
// skip the rest of the line
while ($this->index < $this->len) {
$this->skipToNewline();
// skip newlines
while ($this->index < $this->len && ($this->contents[$this->index] === "\r" || $this->contents[$this->index] === "\n")) {
$this->index += 1;
}
break;
}
}
}
private function peek(string $char): bool
{
return $this->index + 1 < $this->len && $this->contents[$this->index + 1] === $char;
}
/**
* @param non-empty-string $regex
* @param null|array<int, string> $match
*/
private function match(string $regex, array &$match = null): bool
{
return Preg::isMatch($regex, $this->contents, $match, 0, $this->index);
}
}
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