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