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FormattedCommandAlias: match placeholders using regex

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Dylan K. Taylor 2022-05-01 21:16:13 +01:00
parent f4d71d0b48
commit a353872327
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GPG Key ID: 8927471A91CAFD3D
1 changed files with 34 additions and 43 deletions
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77
src/command/FormattedCommandAlias.php
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@ -26,12 +26,20 @@ namespace pocketmine\command;
use pocketmine\Server;
use pocketmine\utils\TextFormat;
use function count;
use function ord;
use function preg_match;
use function strlen;
use function strpos;
use function substr;
class FormattedCommandAlias extends Command{
/**
* - matches a $
* - captures an optional second $ to indicate required/optional
* - captures a series of digits which don't start with a 0
* - captures an optional - to indicate variadic
*/
private const FORMAT_STRING_REGEX = '/\G\$(\$)?((?!0)+\d+)(-)?/';
/** @var string[] */
private array $formatStrings = [];
@ -68,50 +76,21 @@ class FormattedCommandAlias extends Command{
* @param string[] $args
*/
private function buildCommand(string $formatString, array $args) : string{
$index = strpos($formatString, '$');
while($index !== false){
$index = 0;
while(($index = strpos($formatString, '$', $index)) !== false){
$start = $index;
if($index > 0 && $formatString[$start - 1] === "\\"){
$formatString = substr($formatString, 0, $start - 1) . substr($formatString, $start);
$index = strpos($formatString, '$', $index);
//offset is now pointing at the next character because we just deleted the \
continue;
}
$required = false;
if($formatString[$index + 1] == '$'){
$required = true;
++$index;
}
++$index;
$argStart = $index;
while($index < strlen($formatString) && self::inRange(ord($formatString[$index]) - 48, 0, 9)){
++$index;
}
if($argStart === $index){
$info = self::extractPlaceholderInfo($formatString, $index);
if($info === null){
throw new \InvalidArgumentException("Invalid replacement token");
}
$position = (int) substr($formatString, $argStart, $index);
if($position === 0){
throw new \InvalidArgumentException("Invalid replacement token");
}
--$position;
$rest = false;
if($index < strlen($formatString) && $formatString[$index] === "-"){
$rest = true;
++$index;
}
$end = $index;
[$fullPlaceholder, $required, $position, $rest] = $info;
$position--; //array offsets start at 0, but placeholders start at 1
if($required && $position >= count($args)){
throw new \InvalidArgumentException("Missing required argument " . ($position + 1));
@ -119,20 +98,15 @@ class FormattedCommandAlias extends Command{
$replacement = self::buildReplacement($args, $position, $rest);
$end = $index + strlen($fullPlaceholder);
$formatString = substr($formatString, 0, $start) . $replacement . substr($formatString, $end);
$index = $start + strlen($replacement);
$index = strpos($formatString, '$', $index);
}
return $formatString;
}
private static function inRange(int $i, int $j, int $k) : bool{
return $i >= $j && $i <= $k;
}
/**
* @param string[] $args
* @phpstan-param list<string> $args
@ -153,4 +127,21 @@ class FormattedCommandAlias extends Command{
return $replacement;
}
/**
* @phpstan-return array{string, bool, int, bool}
*/
private static function extractPlaceholderInfo(string $commandString, int $offset) : ?array{
if(preg_match(self::FORMAT_STRING_REGEX, $commandString, $matches, 0, $offset) !== 1){
return null;
}
$fullPlaceholder = $matches[0];
$required = ($matches[1] ?? "") !== "";
$position = (int) $matches[2];
$variadic = ($matches[3] ?? "") !== "";
return [$fullPlaceholder, $required, $position, $variadic];
}
}