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<?php declare(strict_types=1);
namespace PhpParser\Lexer\TokenEmulator;
use PhpParser\Lexer\Emulative;
final class FlexibleDocStringEmulator extends TokenEmulator
{
const FLEXIBLE_DOC_STRING_REGEX = <<<'REGEX'
/<<<[ \t]*(['"]?)([a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*)\1\r?\n
(?:.*\r?\n)*?
(?<indentation>\h*)\2(?![a-zA-Z0-9_\x80-\xff])(?<separator>(?:;?[\r\n])?)/x
REGEX;
public function getPhpVersion(): string
{
return Emulative::PHP_7_3;
}
public function isEmulationNeeded(string $code) : bool
{
return strpos($code, '<<<') !== false;
}
public function emulate(string $code, array $tokens): array
{
// Handled by preprocessing + fixup.
return $tokens;
}
public function reverseEmulate(string $code, array $tokens): array
{
// Not supported.
return $tokens;
}
public function preprocessCode(string $code, array &$patches): string {
if (!preg_match_all(self::FLEXIBLE_DOC_STRING_REGEX, $code, $matches, PREG_SET_ORDER|PREG_OFFSET_CAPTURE)) {
// No heredoc/nowdoc found
return $code;
}
// Keep track of how much we need to adjust string offsets due to the modifications we
// already made
$posDelta = 0;
foreach ($matches as $match) {
$indentation = $match['indentation'][0];
$indentationStart = $match['indentation'][1];
$separator = $match['separator'][0];
$separatorStart = $match['separator'][1];
if ($indentation === '' && $separator !== '') {
// Ordinary heredoc/nowdoc
continue;
}
if ($indentation !== '') {
// Remove indentation
$indentationLen = strlen($indentation);
$code = substr_replace($code, '', $indentationStart + $posDelta, $indentationLen);
$patches[] = [$indentationStart + $posDelta, 'add', $indentation];
$posDelta -= $indentationLen;
}
if ($separator === '') {
// Insert newline as separator
$code = substr_replace($code, "\n", $separatorStart + $posDelta, 0);
$patches[] = [$separatorStart + $posDelta, 'remove', "\n"];
$posDelta += 1;
}
}
return $code;
}
}
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