<?php declare(strict_types=1);
namespace PhpParser\Lexer\TokenEmulator;
use PhpParser\Token;
abstract class KeywordEmulator extends TokenEmulator {
abstract public function getKeywordString(): string;
abstract public function getKeywordToken(): int;
public function isEmulationNeeded(string $code): bool {
return strpos(strtolower($code), $this->getKeywordString()) !== false;
}
/** @param Token[] $tokens */
protected function isKeywordContext(array $tokens, int $pos): bool {
$prevToken = $this->getPreviousNonSpaceToken($tokens, $pos);
if ($prevToken === null) {
return false;
}
return $prevToken->id !== \T_OBJECT_OPERATOR
&& $prevToken->id !== \T_NULLSAFE_OBJECT_OPERATOR;
}
public function emulate(string $code, array $tokens): array {
$keywordString = $this->getKeywordString();
foreach ($tokens as $i => $token) {
if ($token->id === T_STRING && strtolower($token->text) === $keywordString
&& $this->isKeywordContext($tokens, $i)) {
$token->id = $this->getKeywordToken();
}
}
return $tokens;
}
/** @param Token[] $tokens */
private function getPreviousNonSpaceToken(array $tokens, int $start): ?Token {
for ($i = $start - 1; $i >= 0; --$i) {
if ($tokens[$i]->id === T_WHITESPACE) {
continue;
}
return $tokens[$i];
}
return null;
}
public function reverseEmulate(string $code, array $tokens): array {
$keywordToken = $this->getKeywordToken();
foreach ($tokens as $token) {
if ($token->id === $keywordToken) {
$token->id = \T_STRING;
}
}
return $tokens;
}
}