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<?php /* * This file is part of Psy Shell. * * (c) 2012-2026 Justin Hileman * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Psy\Readline\Interactive\Input; use PhpParser\Error; use Psy\CodeAnalysis\BufferAnalyzer; /** * Determines whether a buffer is ready to execute as a statement. */ class StatementCompletenessPolicy { private BufferAnalyzer $bufferAnalyzer; private bool $requireSemicolons; public function __construct(BufferAnalyzer $bufferAnalyzer, bool $requireSemicolons = false) { $this->bufferAnalyzer = $bufferAnalyzer; $this->requireSemicolons = $requireSemicolons; } public function isCompleteStatement(string $line): bool { if ($line === '') { return true; } $analysis = $this->bufferAnalyzer->analyze($line); $lastError = $analysis->getLastError(); // Control structures like `if (...)` are incomplete in REPL context. if ($analysis->hasControlStructureWithoutBody()) { return false; } if ($lastError === null) { if (!$analysis->hasBalancedBrackets()) { return false; } if ($analysis->hasTrailingOperator()) { return false; } return true; } if (!$this->requireSemicolons && $analysis->hasEOFError()) { if ($this->bufferAnalyzer->canBeFixedWithSemicolon($line)) { return true; } } if ($this->isUnterminatedComment($lastError) || $this->isUnclosedString($lastError)) { return false; } if (!$analysis->hasEOFError()) { // Real syntax errors should execute immediately so the user sees them. return true; } return false; } /** * Check whether the buffer has a non-EOF parse error that isn't recoverable * by adding more input (e.g. extra closing brackets, invalid syntax). */ public function hasUnrecoverableSyntaxError(string $line): bool { if ($line === '') { return false; } $analysis = $this->bufferAnalyzer->analyze($line); $lastError = $analysis->getLastError(); if ($lastError === null) { return false; } if ($analysis->hasEOFError()) { return false; } if ($this->isUnterminatedComment($lastError) || $this->isUnclosedString($lastError)) { return false; } // Control structures without body aren't syntax errors, they're incomplete. if ($analysis->hasControlStructureWithoutBody()) { return false; } return true; } public function hasBalancedBrackets(string $line): bool { return $this->bufferAnalyzer->analyze($line)->hasBalancedBrackets(); } private function isUnterminatedComment(Error $error): bool { return $error->getRawMessage() === 'Unterminated comment'; } private function isUnclosedString(Error $error): bool { $msg = $error->getRawMessage(); return $msg === 'Syntax error, unexpected T_ENCAPSED_AND_WHITESPACE' || \strpos($msg, 'Unterminated string') !== false; } }
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