Twig_Node_Expression_NullCoalesce Class Reference

Inheritance diagram for Twig_Node_Expression_NullCoalesce:

Collaboration diagram for Twig_Node_Expression_NullCoalesce:

Public Member Functions
	__construct (Twig_NodeInterface $left, Twig_NodeInterface $right, $lineno)
	compile (Twig_Compiler $compiler)
	Compiles the node to PHP. More...
Public Member Functions inherited from Twig_Node_Expression_Conditional
	__construct (Twig_Node_Expression $expr1, Twig_Node_Expression $expr2, Twig_Node_Expression $expr3, $lineno)
	compile (Twig_Compiler $compiler)
	Compiles the node to PHP. More...
Public Member Functions inherited from Twig_Node
	__construct (array $nodes=array(), array $attributes=array(), $lineno=0, $tag=null)
	Constructor. More...
	__toString ()
	toXml ($asDom=false)
	compile (Twig_Compiler $compiler)
	Compiles the node to PHP. More...
	getTemplateLine ()
	getLine ()
	getNodeTag ()
	hasAttribute ($name)
	getAttribute ($name)
	setAttribute ($name, $value)
	removeAttribute ($name)
	hasNode ($name)
	getNode ($name)
	setNode ($name, $node=null)
	removeNode ($name)
	count ()
	getIterator ()
	setTemplateName ($name)
	getTemplateName ()
	setFilename ($name)
	getFilename ()
	compile (Twig_Compiler $compiler)
	Compiles the node to PHP. More...
	getLine ()
	getNodeTag ()

Additional Inherited Members
Protected Attributes inherited from Twig_Node
	$nodes
	$attributes
	$lineno
	$tag

Detailed Description

Definition at line 11 of file NullCoalesce.php.

Constructor & Destructor Documentation

__construct()

Twig_Node_Expression_NullCoalesce::__construct	(	Twig_NodeInterface	$left,
		Twig_NodeInterface	$right,
			$lineno
	)

Definition at line 13 of file NullCoalesce.php.

    {
        $test = new Twig_Node_Expression_Binary_And(
            new Twig_Node_Expression_Test_Defined(clone $left, 'defined', new Twig_Node(), $left->getTemplateLine()),
            new Twig_Node_Expression_Unary_Not(new Twig_Node_Expression_Test_Null($left, 'null', new Twig_Node(), $left->getTemplateLine()), $left->getTemplateLine()),
            $left->getTemplateLine()
        );
 
        parent::__construct($test, $left, $right, $lineno);
    }

References Twig_Node\$lineno, and $test.

Member Function Documentation

compile()

Twig_Node_Expression_NullCoalesce::compile

(

Twig_Compiler

$compiler

)

Compiles the node to PHP.

Reimplemented from Twig_Node_Expression_Conditional.

Definition at line 24 of file NullCoalesce.php.

    {
        /*
         * This optimizes only one case. PHP 7 also supports more complex expressions
         * that can return null. So, for instance, if log is defined, log("foo") ?? "..." works,
         * but log($a["foo"]) ?? "..." does not if $a["foo"] is not defined. More advanced
         * cases might be implemented as an optimizer node visitor, but has not been done
         * as benefits are probably not worth the added complexity.
         */
        if (PHP_VERSION_ID >= 70000 && $this->getNode('expr2') instanceof Twig_Node_Expression_Name) {
            $this->getNode('expr2')->setAttribute('always_defined', true);
            $compiler
                ->raw('((')
                ->subcompile($this->getNode('expr2'))
                ->raw(') ?? (')
                ->subcompile($this->getNode('expr3'))
                ->raw('))')
            ;
        } else {
            parent::compile($compiler);
        }
    }

References Twig_Node\getNode(), and Twig_Compiler\raw().

Here is the call graph for this function:

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The documentation for this class was generated from the following file:

• libs/composer/vendor/twig/twig/lib/Twig/Node/Expression/NullCoalesce.php