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<?php declare(strict_types=1);
namespace PhpParser\Lexer\TokenEmulator;
use PhpParser\Lexer\Emulative;
final class NumericLiteralSeparatorEmulator extends TokenEmulator
{
const BIN = '(?:0b[01]+(?:_[01]+)*)';
const HEX = '(?:0x[0-9a-f]+(?:_[0-9a-f]+)*)';
const DEC = '(?:[0-9]+(?:_[0-9]+)*)';
const SIMPLE_FLOAT = '(?:' . self::DEC . '\.' . self::DEC . '?|\.' . self::DEC . ')';
const EXP = '(?:e[+-]?' . self::DEC . ')';
const FLOAT = '(?:' . self::SIMPLE_FLOAT . self::EXP . '?|' . self::DEC . self::EXP . ')';
const NUMBER = '~' . self::FLOAT . '|' . self::BIN . '|' . self::HEX . '|' . self::DEC . '~iA';
public function getPhpVersion(): string
{
return Emulative::PHP_7_4;
}
public function isEmulationNeeded(string $code) : bool
{
return preg_match('~[0-9]_[0-9]~', $code)
|| preg_match('~0x[0-9a-f]+_[0-9a-f]~i', $code);
}
public function emulate(string $code, array $tokens): array
{
// We need to manually iterate and manage a count because we'll change
// the tokens array on the way
$codeOffset = 0;
for ($i = 0, $c = count($tokens); $i < $c; ++$i) {
$token = $tokens[$i];
$tokenLen = \strlen(\is_array($token) ? $token[1] : $token);
if ($token[0] !== T_LNUMBER && $token[0] !== T_DNUMBER) {
$codeOffset += $tokenLen;
continue;
}
$res = preg_match(self::NUMBER, $code, $matches, 0, $codeOffset);
assert($res, "No number at number token position");
$match = $matches[0];
$matchLen = \strlen($match);
if ($matchLen === $tokenLen) {
// Original token already holds the full number.
$codeOffset += $tokenLen;
continue;
}
$tokenKind = $this->resolveIntegerOrFloatToken($match);
$newTokens = [[$tokenKind, $match, $token[2]]];
$numTokens = 1;
$len = $tokenLen;
while ($matchLen > $len) {
$nextToken = $tokens[$i + $numTokens];
$nextTokenText = \is_array($nextToken) ? $nextToken[1] : $nextToken;
$nextTokenLen = \strlen($nextTokenText);
$numTokens++;
if ($matchLen < $len + $nextTokenLen) {
// Split trailing characters into a partial token.
assert(is_array($nextToken), "Partial token should be an array token");
$partialText = substr($nextTokenText, $matchLen - $len);
$newTokens[] = [$nextToken[0], $partialText, $nextToken[2]];
break;
}
$len += $nextTokenLen;
}
array_splice($tokens, $i, $numTokens, $newTokens);
$c -= $numTokens - \count($newTokens);
$codeOffset += $matchLen;
}
return $tokens;
}
private function resolveIntegerOrFloatToken(string $str): int
{
$str = str_replace('_', '', $str);
if (stripos($str, '0b') === 0) {
$num = bindec($str);
} elseif (stripos($str, '0x') === 0) {
$num = hexdec($str);
} elseif (stripos($str, '0') === 0 && ctype_digit($str)) {
$num = octdec($str);
} else {
$num = +$str;
}
return is_float($num) ? T_DNUMBER : T_LNUMBER;
}
public function reverseEmulate(string $code, array $tokens): array
{
// Numeric separators were not legal code previously, don't bother.
return $tokens;
}
}
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