Builds a {@link BindingDescriptor} expression for a given
{@link AssetMapping} expression.

@param Expression $expr The {@link AssetMapping} expression.

@return Expression The built expression.
550556
public function buildExpression(Expression $expr = null)
    {
        if (!$this->defaultExpression) {
            $this->defaultExpression = Expr::same(BindingState::ENABLED, BindingDescriptor::STATE)
                ->andSame(AssetPlugin::BINDING_TYPE, BindingDescriptor::TYPE_NAME)
                ->andEndsWith('{,/**/*}', BindingDescriptor::QUERY);
        }

        if (!$expr) {
            return $this->defaultExpression;
        }

        $traverser = new ExpressionTraverser();
        $traverser->addVisitor($this);

        return $this->defaultExpression->andX($traverser->traverse($expr));
    }
439833
protected static function getParametersFromExpression(DOMNode $node, $expr)
	{
		$varNames   = XPathHelper::getVariables($expr);
		$paramNames = [];
		$xpath      = new DOMXPath($node->ownerDocument);
		foreach ($varNames as $name)
		{
			// Test whether this is the name of a local variable
			$query = 'ancestor-or-self::*/preceding-sibling::xsl:variable[@name="' . $name . '"]';
			if (!$xpath->query($query, $node)->length)
			{
				$paramNames[] = $name;
			}
		}

		return $paramNames;
	}
13807
public static <T> SimpleExpression<T> asSimple(Expression<T> expr) {
        Expression<T> underlyingMixin = ExpressionUtils.extract(expr);
        if (underlyingMixin instanceof PathImpl) {
            return new SimplePath<T>((PathImpl<T>) underlyingMixin);
        } else if (underlyingMixin instanceof OperationImpl) {
            return new SimpleOperation<T>((OperationImpl<T>) underlyingMixin);
        } else if (underlyingMixin instanceof TemplateExpressionImpl) {
            return new SimpleTemplate<T>((TemplateExpressionImpl<T>) underlyingMixin);
        } else {
            return new SimpleExpression<T>(underlyingMixin) {

                private static final long serialVersionUID = -8712299418891960222L;

                @Override
                public <R, C> R accept(Visitor<R, C> v, C context) {
                    return this.mixin.accept(v, context);
                }

            };
        }
    }
1001084
public function addNotExistsToQueryCondition(Expr $expr)
    {
        $expr->attr($this->getHashKey()->getPropertyMetadata()->name)->exists(false);
    }
888789
protected function checkAttributeExpression(DOMNode $node, Tag $tag, $expr)
	{
		preg_match_all('(@([-\\w]+))', $expr, $matches);
		foreach ($matches[1] as $attrName)
		{
			$this->checkAttribute($node, $tag, $attrName);
		}
	}
56760
protected function buildExpression(Expression $expression)
    {
        $template = $expression instanceof Subquery ? '(%s)' : '%s';
        $expressionString = $this->stringifyExpression($expression);
        
        return trim(sprintf($template, $expressionString));
    }
539784
def get_expression_target(expression: Expression, expr_vars: InheritedDict) -> BindingTarget:
    ''''''
    root = expression.get_object_tree()
    if len(root.children) != 1 or not PROPERTY_EXPRESSION_REGEX.fullmatch(expression.code):
        error = BindingError('Expression should be property expression')
        error.add_info('Expression', expression.code)
        raise error
    if root.children[0].children:
        return PropertyExpressionTarget(expression, expr_vars)
    return GlobalValueExpressionTarget(expression, expr_vars)
1300922
public function leaveExpression(Expression $expr)
    {
        if ($expr instanceof OrX || $expr instanceof AndX) {
            $hash = spl_object_hash($expr);

            if ($expr instanceof OrX) {
                $composite = $this->qb->expr()->orX();
                $composite->addMultiple($this->map[$hash]);
            } else {
                $composite = $this->qb->expr()->andX();
                $composite->addMultiple($this->map[$hash]);
            }

            unset($this->hashes[array_search($hash, $this->hashes)]);

            if (!count($this->hashes)) {
                $this->qb->andWhere($composite);
            } else {
                $lastHash = end($this->hashes);

                $this->map[$lastHash][] = $composite;
            }
        }

        return $expr;
    }
270719
protected function buildExpression($collection, $type = AndX::class)
    {
        $expressions = [];

        /** @var Expression $expression */
        foreach ($collection as $expression) {
            if (!$expression instanceof Expression) {
                throw new \Exception(sprintf('Expressions must be of type %s', Expression::class));
            }

            if (count($expression->getChildren())) {
                $expressions[] = $this->buildExpression($expression->getChildren(), $expression->getConstraint());
            } else {
                $expressions[] = $this->transform($expression);
            }
        }

        return new $type($expressions);
    }
1354475
@Override
    public List<AbstractExpression> bindingToIndexedExpression(AbstractExpression expr) {
        if (equals(expr)) {
            return s_reusableImmutableEmptyBinding;
        }
        return null;
    }
1234898
protected function getParamKeyByExpr(ExprInterface $expr)
    {
        return str_replace('.', '', $expr->getField()) . ucfirst($expr->getExpression()) . uniqid();
    }
176492
public function regexp($expression, $description = null): ValidatorChain
    {
        $rule = Validator::rule('regexp', [$expression]);
        if (null !== $description) {
            $rule->setDescription($description);
        }
        $this->addRule($rule);
        return $this;
    }
956851
public function postProcessExpression(Expression $expression)
    {
        if ($this->hasHash($expression->hashCode())) {
            $alias = $this->getAlias($expression->hashCode());
            $alias = new Expr\Column($alias);
            $alias->setBuilder($this);
            $expression = new Expr\Raw(sprintf('%s AS %s', $expression->toSQL(), $alias->toSQL()));
        }
        
        return $expression;
    }
202965
public static <T> ArrayConstructorExpression<T> array(Class<T[]> type, Expression<T>... exprs) {
        return new ArrayConstructorExpression<T>(type, exprs);
    }
682281
public function resolveExpressionNodeToType($expr)
    {
        // PARENTHESIZED EXPRESSION
        // Retrieve inner expression from parenthesized expression
        while ($expr instanceof Node\Expression\ParenthesizedExpression) {
            $expr = $expr->expression;
        }

        if ($expr == null || $expr instanceof PhpParser\MissingToken || $expr instanceof PhpParser\SkippedToken) {
            // TODO some members are null or Missing/SkippedToken
            // How do we handle this more generally?
            return new Types\Mixed_;
        }

        // VARIABLE
        //   $this -> Type\this
        //   $myVariable -> type of corresponding assignment expression
        if ($expr instanceof Node\Expression\Variable || $expr instanceof Node\UseVariableName) {
            if ($expr->getName() === 'this') {
                return new Types\Object_(new Fqsen('\\' . $this->getContainingClassFqn($expr)));
            }
            // Find variable definition (parameter or assignment expression)
            $defNode = $this->resolveVariableToNode($expr);
            if ($defNode instanceof Node\Expression\AssignmentExpression || $defNode instanceof Node\UseVariableName) {
                return $this->resolveExpressionNodeToType($defNode);
            }
            if ($defNode instanceof Node\ForeachKey || $defNode instanceof Node\ForeachValue) {
                return $this->getTypeFromNode($defNode);
            }
            if ($defNode instanceof Node\Parameter) {
                return $this->getTypeFromNode($defNode);
            }
        }

        // FUNCTION CALL
        // Function calls are resolved to type corresponding to their FQN
        if ($expr instanceof Node\Expression\CallExpression &&
            !(
                $expr->callableExpression instanceof Node\Expression\ScopedPropertyAccessExpression ||
                $expr->callableExpression instanceof Node\Expression\MemberAccessExpression)
        ) {
            // Find the function definition
            if ($expr->callableExpression instanceof Node\Expression) {
                // Cannot get type for dynamic function call
                return new Types\Mixed_;
            }

            if ($expr->callableExpression instanceof Node\QualifiedName) {
                $fqn = $expr->callableExpression->getResolvedName() ?? $expr->callableExpression->getNamespacedName();
                $fqn .= '()';
                $def = $this->index->getDefinition($fqn, true);
                if ($def !== null) {
                    return $def->type;
                }
            }
        }

        // TRUE / FALSE / NULL
        // Resolve true and false reserved words to Types\Boolean
        if ($expr instanceof Node\ReservedWord) {
            $token = $expr->children->kind;
            if ($token === PhpParser\TokenKind::TrueReservedWord || $token === PhpParser\TokenKind::FalseReservedWord) {
                return new Types\Boolean;
            }

            if ($token === PhpParser\TokenKind::NullReservedWord) {
                return new Types\Null_;
            }
        }

        // CONSTANT FETCH
        // Resolve constants by retrieving corresponding definition type from FQN
        if (ParserHelpers\isConstantFetch($expr)) {
            $fqn = (string)$expr->getNamespacedName();
            $def = $this->index->getDefinition($fqn, true);
            if ($def !== null) {
                return $def->type;
            }
        }

        // MEMBER CALL EXPRESSION/SCOPED PROPERTY CALL EXPRESSION
        //   The type of the member/scoped property call expression is the type of the method, so resolve the
        //   type of the callable expression.
        if ($expr instanceof Node\Expression\CallExpression && (
            $expr->callableExpression instanceof Node\Expression\MemberAccessExpression ||
            $expr->callableExpression instanceof Node\Expression\ScopedPropertyAccessExpression)
        ) {
            return $this->resolveExpressionNodeToType($expr->callableExpression);
        }

        // MEMBER ACCESS EXPRESSION
        if ($expr instanceof Node\Expression\MemberAccessExpression) {
            if ($expr->memberName instanceof Node\Expression) {
                return new Types\Mixed_;
            }
            $var = $expr->dereferencableExpression;

           // Resolve object
            $objType = $this->resolveExpressionNodeToType($var);
            if (!($objType instanceof Types\Compound)) {
                $objType = new Types\Compound([$objType]);
            }
            for ($i = 0; $t = $objType->get($i); $i++) {
                if ($t instanceof Types\This) {
                    $classFqn = self::getContainingClassFqn($expr);
                    if ($classFqn === null) {
                        return new Types\Mixed_;
                    }
                } else if (!($t instanceof Types\Object_) || $t->getFqsen() === null) {
                    return new Types\Mixed_;
                } else {
                    $classFqn = substr((string)$t->getFqsen(), 1);
                }
                $add = '->' . $expr->memberName->getText($expr->getFileContents());
                if ($expr->parent instanceof Node\Expression\CallExpression) {
                    $add .= '()';
                }
                $classDef = $this->index->getDefinition($classFqn);
                if ($classDef !== null) {
                    foreach ($classDef->getAncestorDefinitions($this->index, true) as $fqn => $def) {
                        $def = $this->index->getDefinition($fqn . $add);
                        if ($def !== null) {
                            if ($def->type instanceof Types\This || $def->type instanceof Types\Self_) {
                                return new Types\Object_(new Fqsen('\\' . $classFqn));
                            }
                            return $def->type;
                        }
                    }
                }
            }
        }

        // SCOPED PROPERTY ACCESS EXPRESSION
        if ($expr instanceof Node\Expression\ScopedPropertyAccessExpression) {
            $classType = $this->resolveClassNameToType($expr->scopeResolutionQualifier);
            if (!($classType instanceof Types\Object_) || $classType->getFqsen() === null) {
                return new Types\Mixed_;
            }
            $fqn = substr((string)$classType->getFqsen(), 1) . '::';

            // TODO is there a cleaner way to do this?
            $fqn .= $expr->memberName->getText() ?? $expr->memberName->getText($expr->getFileContents());
            if ($expr->parent instanceof Node\Expression\CallExpression) {
                $fqn .= '()';
            }

            $def = $this->index->getDefinition($fqn);
            if ($def === null) {
                return new Types\Mixed_;
            }
            return $def->type;
        }

        // OBJECT CREATION EXPRESSION
        //   new A() => resolves to the type of the class type designator (A)
        //   TODO: new $this->a => resolves to the string represented by "a"
        if ($expr instanceof Node\Expression\ObjectCreationExpression) {
            return $this->resolveClassNameToType($expr->classTypeDesignator);
        }

        // CLONE EXPRESSION
        //   clone($a) => resolves to the type of $a
        if ($expr instanceof Node\Expression\CloneExpression) {
            return $this->resolveExpressionNodeToType($expr->expression);
        }

        // ASSIGNMENT EXPRESSION
        //   $a = $myExpression => resolves to the type of the right-hand operand
        if ($expr instanceof Node\Expression\AssignmentExpression) {
            return $this->resolveExpressionNodeToType($expr->rightOperand);
        }

        // TERNARY EXPRESSION
        //   $condition ? $ifExpression : $elseExpression => reslves to type of $ifCondition or $elseExpression
        //   $condition ?: $elseExpression => resolves to type of $condition or $elseExpression
        if ($expr instanceof Node\Expression\TernaryExpression) {
            // ?:
            if ($expr->ifExpression === null) {
                return new Types\Compound([
                    $this->resolveExpressionNodeToType($expr->condition), // TODO: why?
                    $this->resolveExpressionNodeToType($expr->elseExpression)
                ]);
            }
            // Ternary is a compound of the two possible values
            return new Types\Compound([
                $this->resolveExpressionNodeToType($expr->ifExpression),
                $this->resolveExpressionNodeToType($expr->elseExpression)
            ]);
        }

        // NULL COALLESCE
        //   $rightOperand ?? $leftOperand => resolves to type of $rightOperand or $leftOperand
        if ($expr instanceof Node\Expression\BinaryExpression && $expr->operator->kind === PhpParser\TokenKind::QuestionQuestionToken) {
            // ?? operator
            return new Types\Compound([
                $this->resolveExpressionNodeToType($expr->leftOperand),
                $this->resolveExpressionNodeToType($expr->rightOperand)
            ]);
        }

        // BOOLEAN EXPRESSIONS: resolve to Types\Boolean
        //   (bool) $expression
        //   !$expression
        //   empty($var)
        //   isset($var)
        //   >, >=, <, <=, &&, ||, AND, OR, XOR, ==, ===, !=, !==
        if (
            ParserHelpers\isBooleanExpression($expr)

            || ($expr instanceof Node\Expression\CastExpression && $expr->castType->kind === PhpParser\TokenKind::BoolCastToken)
            || ($expr instanceof Node\Expression\UnaryOpExpression && $expr->operator->kind === PhpParser\TokenKind::ExclamationToken)
            || $expr instanceof Node\Expression\EmptyIntrinsicExpression
            || $expr instanceof Node\Expression\IssetIntrinsicExpression
        ) {
            return new Types\Boolean;
        }

        // STRING EXPRESSIONS: resolve to Types\String
        //   [concatenation] .=, .
        //   [literals] "hello", \b"hello", \B"hello", 'hello', \b'hello', HEREDOC, NOWDOC
        //   [cast] (string) "hello"
        //
        //   TODO: Magic constants (__CLASS__, __DIR__, __FUNCTION__, __METHOD__, __NAMESPACE__, __TRAIT__, __FILE__)
        if (
            ($expr instanceof Node\Expression\BinaryExpression &&
                ($expr->operator->kind === PhpParser\TokenKind::DotToken || $expr->operator->kind === PhpParser\TokenKind::DotEqualsToken)) ||
            $expr instanceof Node\StringLiteral ||
            ($expr instanceof Node\Expression\CastExpression && $expr->castType->kind === PhpParser\TokenKind::StringCastToken)
        ) {
            return new Types\String_;
        }

        // BINARY EXPRESSIONS:
        // Resolve to Types\Integer if both left and right operands are integer types, otherwise Types\Float
        //   [operator] +, -, *, **
        //   [assignment] *=, **=, -=, +=
        // Resolve to Types\Float
        //   [assignment] /=
        if (
            $expr instanceof Node\Expression\BinaryExpression &&
            ($operator = $expr->operator->kind)
            && ($operator === PhpParser\TokenKind::PlusToken ||
                $operator === PhpParser\TokenKind::AsteriskAsteriskToken ||
                $operator === PhpParser\TokenKind::AsteriskToken ||
                $operator === PhpParser\TokenKind::MinusToken ||

                // Assignment expressions (TODO: consider making this a type of AssignmentExpression rather than kind of BinaryExpression)
                $operator === PhpParser\TokenKind::AsteriskEqualsToken||
                $operator === PhpParser\TokenKind::AsteriskAsteriskEqualsToken ||
                $operator === PhpParser\TokenKind::MinusEqualsToken ||
                $operator === PhpParser\TokenKind::PlusEqualsToken
            )
        ) {
            if (
                $this->resolveExpressionNodeToType($expr->leftOperand) instanceof Types\Integer
                && $this->resolveExpressionNodeToType($expr->rightOperand) instanceof Types\Integer
            ) {
                return new Types\Integer;
            }
            return new Types\Float_;
        } else if (
            $expr instanceof Node\Expression\BinaryExpression &&
            $expr->operator->kind === PhpParser\TokenKind::SlashEqualsToken
        ) {
            return new Types\Float_;
        }

        // INTEGER EXPRESSIONS: resolve to Types\Integer
        //   [literal] 1
        //   [operator] <=>, &, ^, |
        //   TODO: Magic constants (__LINE__)
        if (
            // TODO: consider different Node types of float/int, also better property name (not "children")
            ($expr instanceof Node\NumericLiteral && $expr->children->kind === PhpParser\TokenKind::IntegerLiteralToken) ||
            $expr instanceof Node\Expression\BinaryExpression && (
                ($operator = $expr->operator->kind)
                && ($operator === PhpParser\TokenKind::LessThanEqualsGreaterThanToken ||
                    $operator === PhpParser\TokenKind::AmpersandToken ||
                    $operator === PhpParser\TokenKind::CaretToken ||
                    $operator === PhpParser\TokenKind::BarToken)
            )
        ) {
            return new Types\Integer;
        }

        // FLOAT EXPRESSIONS: resolve to Types\Float
        //   [literal] 1.5
        //   [operator] /
        //   [cast] (double)
        if (
            $expr instanceof Node\NumericLiteral && $expr->children->kind === PhpParser\TokenKind::FloatingLiteralToken ||
            ($expr instanceof Node\Expression\CastExpression && $expr->castType->kind === PhpParser\TokenKind::DoubleCastToken) ||
            ($expr instanceof Node\Expression\BinaryExpression && $expr->operator->kind === PhpParser\TokenKind::SlashToken)
        ) {
            return new Types\Float_;
        }

        // ARRAY CREATION EXPRESSION:
        // Resolve to Types\Array (Types\Compound of value and key types)
        //  [a, b, c]
        //  [1=>"hello", "hi"=>1, 4=>[]]s
        if ($expr instanceof Node\Expression\ArrayCreationExpression) {
            $valueTypes = [];
            $keyTypes = [];
            if ($expr->arrayElements !== null) {
                foreach ($expr->arrayElements->getElements() as $item) {
                    $valueTypes[] = $this->resolveExpressionNodeToType($item->elementValue);
                    $keyTypes[] = $item->elementKey ? $this->resolveExpressionNodeToType($item->elementKey) : new Types\Integer;
                }
            }
            $valueTypes = array_unique($valueTypes);
            $keyTypes = array_unique($keyTypes);
            if (empty($valueTypes)) {
                $valueType = null;
            } else if (count($valueTypes) === 1) {
                $valueType = $valueTypes[0];
            } else {
                $valueType = new Types\Compound($valueTypes);
            }
            if (empty($keyTypes)) {
                $keyType = null;
            } else if (count($keyTypes) === 1) {
                $keyType = $keyTypes[0];
            } else {
                $keyType = new Types\Compound($keyTypes);
            }
            return new Types\Array_($valueType, $keyType);
        }

        // SUBSCRIPT EXPRESSION
        // $myArray[3]
        // $myArray{"hello"}
        if ($expr instanceof Node\Expression\SubscriptExpression) {
            $varType = $this->resolveExpressionNodeToType($expr->postfixExpression);
            if (!($varType instanceof Types\Array_)) {
                return new Types\Mixed_;
            }
            return $varType->getValueType();
        }

        // SCRIPT INCLUSION EXPRESSION
        //   include, require, include_once, require_once
        if ($expr instanceof Node\Expression\ScriptInclusionExpression) {
            // TODO: resolve path to PhpDocument and find return statement
            return new Types\Mixed_;
        }

        if ($expr instanceof Node\QualifiedName) {
            return $this->resolveClassNameToType($expr);
        }

        return new Types\Mixed_;
    }
160347
public static ExprString toExprString(Expression expr) {
	if (expr instanceof ExprString) return (ExprString) expr;
	if (expr instanceof Literal) return expr.getFactory().createLitString(((Literal) expr).getString(), expr.getStart(), expr.getEnd());
	return new CastString(expr);
    }
676822
protected function checkExpression(DOMNode $node, $expr, Tag $tag)
	{
		$this->checkContext($node);

		if (preg_match('/^\\$(\\w+)$/', $expr, $m))
		{
			// Either this expression came from a variable that is considered safe, or it's a
			// stylesheet parameters, which are considered safe by default
			$this->checkVariable($node, $tag, $m[1]);
		}
		elseif (preg_match('/^@[-\\w]+(?:\\s*\\|\\s*@[-\\w]+)*$/', $expr))
		{
			$this->checkAttributeExpression($node, $tag, $expr);
		}
		elseif (!$this->isExpressionSafe($expr))
		{
			throw new UnsafeTemplateException("Cannot assess the safety of expression '" . $expr . "'", $node);
		}
	}