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Directory >> /home/whitjouh/public_html/core/vendor/nikic/php-parser/lib/PhpParser/

File / Folder	Size	Action
.	-
Builder	--	ren
Comment	--	ren
ErrorHandler	--	ren
Internal	--	ren
Lexer	--	ren
Node	--	ren
NodeVisitor	--	ren
Parser	--	ren
PrettyPrinter	--	ren
Builder.php	0.197KB	edt ren
BuilderFactory.php	10.292KB	edt ren
BuilderHelpers.php	9.515KB	edt ren
Comment.php	6.669KB	edt ren
ConstExprEvaluationExce...	0.109KB	edt ren
ConstExprEvaluator.php	9.211KB	edt ren
Error.php	4.76KB	edt ren
ErrorHandler.php	0.293KB	edt ren
JsonDecoder.php	3.438KB	edt ren
Lexer.php	4.264KB	edt ren
Modifiers.php	2.15KB	edt ren
NameContext.php	9.821KB	edt ren
Node.php	3.874KB	edt ren
NodeAbstract.php	5.13KB	edt ren
NodeDumper.php	9.97KB	edt ren
NodeFinder.php	2.546KB	edt ren
NodeTraverser.php	10.45KB	edt ren
NodeTraverserInterface.php	0.584KB	edt ren
NodeVisitor.php	4.081KB	edt ren
NodeVisitorAbstract.php	0.437KB	edt ren
Parser.php	0.747KB	edt ren
ParserAbstract.php	48.704KB	edt ren
ParserFactory.php	1.414KB	edt ren
PhpVersion.php	4.466KB	edt ren
PrettyPrinter.php	1.659KB	edt ren
PrettyPrinterAbstract.php	68.481KB	edt ren
Token.php	0.476KB	edt ren
compatibility_tokens.php	1.923KB	edt ren

<?php declare(strict_types=1);

namespace PhpParser;

use PhpParser\Node\Expr;
use PhpParser\Node\Scalar;

use function array_merge;

/**
 * Evaluates constant expressions.
 *
 * This evaluator is able to evaluate all constant expressions (as defined by PHP), which can be
 * evaluated without further context. If a subexpression is not of this type, a user-provided
 * fallback evaluator is invoked. To support all constant expressions that are also supported by
 * PHP (and not already handled by this class), the fallback evaluator must be able to handle the
 * following node types:
 *
 *  * All Scalar\MagicConst\* nodes.
 *  * Expr\ConstFetch nodes. Only null/false/true are already handled by this class.
 *  * Expr\ClassConstFetch nodes.
 *
 * The fallback evaluator should throw ConstExprEvaluationException for nodes it cannot evaluate.
 *
 * The evaluation is dependent on runtime configuration in two respects: Firstly, floating
 * point to string conversions are affected by the precision ini setting. Secondly, they are also
 * affected by the LC_NUMERIC locale.
 */
class ConstExprEvaluator {
    /** @var callable|null */
    private $fallbackEvaluator;

/**
     * Create a constant expression evaluator.
     *
     * The provided fallback evaluator is invoked whenever a subexpression cannot be evaluated. See
     * class doc comment for more information.
     *
     * @param callable|null $fallbackEvaluator To call if subexpression cannot be evaluated
     */
    public function __construct(?callable $fallbackEvaluator = null) {
        $this->fallbackEvaluator = $fallbackEvaluator ?? function (Expr $expr) {
            throw new ConstExprEvaluationException(
                "Expression of type {$expr->getType()} cannot be evaluated"
            );
        };
    }

/**
     * Silently evaluates a constant expression into a PHP value.
     *
     * Thrown Errors, warnings or notices will be converted into a ConstExprEvaluationException.
     * The original source of the exception is available through getPrevious().
     *
     * If some part of the expression cannot be evaluated, the fallback evaluator passed to the
     * constructor will be invoked. By default, if no fallback is provided, an exception of type
     * ConstExprEvaluationException is thrown.
     *
     * See class doc comment for caveats and limitations.
     *
     * @param Expr $expr Constant expression to evaluate
     * @return mixed Result of evaluation
     *
     * @throws ConstExprEvaluationException if the expression cannot be evaluated or an error occurred
     */
    public function evaluateSilently(Expr $expr) {
        set_error_handler(function ($num, $str, $file, $line) {
            throw new \ErrorException($str, 0, $num, $file, $line);
        });

try {
            return $this->evaluate($expr);
        } catch (\Throwable $e) {
            if (!$e instanceof ConstExprEvaluationException) {
                $e = new ConstExprEvaluationException(
                    "An error occurred during constant expression evaluation", 0, $e);
            }
            throw $e;
        } finally {
            restore_error_handler();
        }
    }

/**
     * Directly evaluates a constant expression into a PHP value.
     *
     * May generate Error exceptions, warnings or notices. Use evaluateSilently() to convert these
     * into a ConstExprEvaluationException.
     *
     * If some part of the expression cannot be evaluated, the fallback evaluator passed to the
     * constructor will be invoked. By default, if no fallback is provided, an exception of type
     * ConstExprEvaluationException is thrown.
     *
     * See class doc comment for caveats and limitations.
     *
     * @param Expr $expr Constant expression to evaluate
     * @return mixed Result of evaluation
     *
     * @throws ConstExprEvaluationException if the expression cannot be evaluated
     */
    public function evaluateDirectly(Expr $expr) {
        return $this->evaluate($expr);
    }

/** @return mixed */
    private function evaluate(Expr $expr) {
        if ($expr instanceof Scalar\Int_
            || $expr instanceof Scalar\Float_
            || $expr instanceof Scalar\String_
        ) {
            return $expr->value;
        }

if ($expr instanceof Expr\Array_) {
            return $this->evaluateArray($expr);
        }

// Unary operators
        if ($expr instanceof Expr\UnaryPlus) {
            return +$this->evaluate($expr->expr);
        }
        if ($expr instanceof Expr\UnaryMinus) {
            return -$this->evaluate($expr->expr);
        }
        if ($expr instanceof Expr\BooleanNot) {
            return !$this->evaluate($expr->expr);
        }
        if ($expr instanceof Expr\BitwiseNot) {
            return ~$this->evaluate($expr->expr);
        }

if ($expr instanceof Expr\BinaryOp) {
            return $this->evaluateBinaryOp($expr);
        }

if ($expr instanceof Expr\Ternary) {
            return $this->evaluateTernary($expr);
        }

if ($expr instanceof Expr\ArrayDimFetch && null !== $expr->dim) {
            return $this->evaluate($expr->var)[$this->evaluate($expr->dim)];
        }

if ($expr instanceof Expr\ConstFetch) {
            return $this->evaluateConstFetch($expr);
        }

return ($this->fallbackEvaluator)($expr);
    }

private function evaluateArray(Expr\Array_ $expr): array {
        $array = [];
        foreach ($expr->items as $item) {
            if (null !== $item->key) {
                $array[$this->evaluate($item->key)] = $this->evaluate($item->value);
            } elseif ($item->unpack) {
                $array = array_merge($array, $this->evaluate($item->value));
            } else {
                $array[] = $this->evaluate($item->value);
            }
        }
        return $array;
    }

/** @return mixed */
    private function evaluateTernary(Expr\Ternary $expr) {
        if (null === $expr->if) {
            return $this->evaluate($expr->cond) ?: $this->evaluate($expr->else);
        }

return $this->evaluate($expr->cond)
            ? $this->evaluate($expr->if)
            : $this->evaluate($expr->else);
    }

/** @return mixed */
    private function evaluateBinaryOp(Expr\BinaryOp $expr) {
        if ($expr instanceof Expr\BinaryOp\Coalesce
            && $expr->left instanceof Expr\ArrayDimFetch
        ) {
            // This needs to be special cased to respect BP_VAR_IS fetch semantics
            return $this->evaluate($expr->left->var)[$this->evaluate($expr->left->dim)]
                ?? $this->evaluate($expr->right);
        }

// The evaluate() calls are repeated in each branch, because some of the operators are
        // short-circuiting and evaluating the RHS in advance may be illegal in that case
        $l = $expr->left;
        $r = $expr->right;
        switch ($expr->getOperatorSigil()) {
            case '&':   return $this->evaluate($l) &   $this->evaluate($r);
            case '|':   return $this->evaluate($l) |   $this->evaluate($r);
            case '^':   return $this->evaluate($l) ^   $this->evaluate($r);
            case '&&':  return $this->evaluate($l) &&  $this->evaluate($r);
            case '||':  return $this->evaluate($l) ||  $this->evaluate($r);
            case '??':  return $this->evaluate($l) ??  $this->evaluate($r);
            case '.':   return $this->evaluate($l) .   $this->evaluate($r);
            case '/':   return $this->evaluate($l) /   $this->evaluate($r);
            case '==':  return $this->evaluate($l) ==  $this->evaluate($r);
            case '>':   return $this->evaluate($l) >   $this->evaluate($r);
            case '>=':  return $this->evaluate($l) >=  $this->evaluate($r);
            case '===': return $this->evaluate($l) === $this->evaluate($r);
            case 'and': return $this->evaluate($l) and $this->evaluate($r);
            case 'or':  return $this->evaluate($l) or  $this->evaluate($r);
            case 'xor': return $this->evaluate($l) xor $this->evaluate($r);
            case '-':   return $this->evaluate($l) -   $this->evaluate($r);
            case '%':   return $this->evaluate($l) %   $this->evaluate($r);
            case '*':   return $this->evaluate($l) *   $this->evaluate($r);
            case '!=':  return $this->evaluate($l) !=  $this->evaluate($r);
            case '!==': return $this->evaluate($l) !== $this->evaluate($r);
            case '+':   return $this->evaluate($l) +   $this->evaluate($r);
            case '**':  return $this->evaluate($l) **  $this->evaluate($r);
            case '<<':  return $this->evaluate($l) <<  $this->evaluate($r);
            case '>>':  return $this->evaluate($l) >>  $this->evaluate($r);
            case '<':   return $this->evaluate($l) <   $this->evaluate($r);
            case '<=':  return $this->evaluate($l) <=  $this->evaluate($r);
            case '<=>': return $this->evaluate($l) <=> $this->evaluate($r);
        }

throw new \Exception('Should not happen');
    }

/** @return mixed */
    private function evaluateConstFetch(Expr\ConstFetch $expr) {
        $name = $expr->name->toLowerString();
        switch ($name) {
            case 'null': return null;
            case 'false': return false;
            case 'true': return true;
        }

return ($this->fallbackEvaluator)($expr);
    }
}

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