MathParser\Parsing\Nodes\ExpressionNode Class Reference

AST node representing a binary operator. More...

Inheritance diagram for MathParser\Parsing\Nodes\ExpressionNode:

Public Member Functions
	__construct ($left, $operator=null, $right=null)
	Constructor. More...
	getLeft ()
	Return the first (left) operand. More...
	setLeft ($operand)
	Set the left operand. More...
	getOperator ()
	Return the operator. More...
	setOperator ($operator)
	Set the operator. More...
	getRight ()
	Return the second (right) operand. More...
	setRight ($operand)
	Set the right operand. More...
	getPrecedence ()
	Return the precedence of the ExpressionNode. More...
	accept (Visitor $visitor)
	Implementing the Visitable interface.
	canBeUnary ()
	Returns true if the node can represent a unary operator, i.e. More...
	lowerPrecedenceThan ($other)
	Returns true if the current Node has lower precedence than the one we compare with. More...
	strictlyLowerPrecedenceThan ($other)
	compareTo ($other)
	Implementing the compareTo abstract method. More...
Public Member Functions inherited from MathParser\Parsing\Nodes\Node
	compareTo ($other)
	Helper function, comparing two ASTs. More...
	evaluate ($variables)
	Convenience function for evaluating a tree, using the Evaluator class. More...
	complexity ()
	Rough estimate of the complexity of the AST. More...
	isTerminal ()
	Returns true if the node is a terminal node, i.e. More...
	getOperator ()
	__toString ()

Public Attributes
const	LEFT_ASSOC = 1
	integer constant representing left associatve operators
const	RIGHT_ASSOC = 2
	integer constant representing left associatve operators
Public Attributes inherited from MathParser\Parsing\Nodes\Node
const	NumericInteger = 1
const	NumericRational = 2
const	NumericFloat = 3

Private Attributes
	$left
	Node $left Left operand.
	$operator
	string $operator Operator, e.g. More...
	$right
	Node $right Right operand.
	$precedence
	int $precedence Precedence. More...
	$associativity
	LEFT_ASSOC | RIGHT_ASSOC $associativity Associativity of operator. More...

Additional Inherited Members
Static Public Member Functions inherited from MathParser\Parsing\Nodes\Node
static	rationalFactory (Token $token)
	Node factory, creating an appropriate Node from a Token. More...
static	factory (Token $token)
	Node factory, creating an appropriate Node from a Token. More...

Detailed Description

AST node representing a binary operator.

Constructor & Destructor Documentation

MathParser\Parsing\Nodes\ExpressionNode::__construct	(		$left,
			$operator = null,
			$right = null
	)

Constructor.

Construct a binary operator node from (one or) two operands and an operator.

For convenience, the constructor accept int or float as operands, automatically converting these to NumberNodes

Example

$node = new ExpressionNode(1,'+',2);

Parameters

Node | null | int | float	$left	First operand
string	$operator	Name of operator
Node | null | int | float	$right	Second operand

Member Function Documentation

MathParser\Parsing\Nodes\ExpressionNode::canBeUnary

(

)

Returns true if the node can represent a unary operator, i.e.

if the operator is '+' or '-'-

Return values

boolean

MathParser\Parsing\Nodes\ExpressionNode::compareTo

(

$other

)

Implementing the compareTo abstract method.

MathParser\Parsing\Nodes\ExpressionNode::getLeft

(

)

Return the first (left) operand.

Return values

Node|null

MathParser\Parsing\Nodes\ExpressionNode::getOperator

(

)

Return the operator.

Return values

string

MathParser\Parsing\Nodes\ExpressionNode::getPrecedence

(

)

Return the precedence of the ExpressionNode.

Return values

int	precedence

MathParser\Parsing\Nodes\ExpressionNode::getRight

(

)

Return the second (right) operand.

Return values

Node|null

MathParser\Parsing\Nodes\ExpressionNode::lowerPrecedenceThan

(

$other

)

Returns true if the current Node has lower precedence than the one we compare with.

In case of a tie, we also consider the associativity. (Left associative operators are lower precedence in this context.)

Parameters

Node

$other

Node to compare to.

Return values

boolean

MathParser\Parsing\Nodes\ExpressionNode::setLeft

(

$operand

)

Set the left operand.

Return values

void

MathParser\Parsing\Nodes\ExpressionNode::setOperator

(

$operator

)

Set the operator.

Return values

void

MathParser\Parsing\Nodes\ExpressionNode::setRight

(

$operand

)

Set the right operand.

Return values

void

Member Data Documentation

MathParser\Parsing\Nodes\ExpressionNode::$associativity

private

LEFT_ASSOC | RIGHT_ASSOC $associativity Associativity of operator.

MathParser\Parsing\Nodes\ExpressionNode::$operator

private

string $operator Operator, e.g.

'+', '-', '*', '/' or '^'

MathParser\Parsing\Nodes\ExpressionNode::$precedence

private

int $precedence Precedence.

Operators with higher prcedence bind harder

---

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

• src/MathParser/Parsing/Nodes/ExpressionNode.php