MathParser\Parsing\Nodes\Factories\SubtractionNodeFactory Class Reference

Factory for creating an ExpressionNode representing '-'. More...

Inheritance diagram for MathParser\Parsing\Nodes\Factories\SubtractionNodeFactory:

Public Member Functions
	makeNode ($leftOperand, $rightOperand)
	Create a Node representing 'leftOperand - rightOperand'. More...
	createUnaryMinusNode ($operand)
	Create a Node representing '-$operand'. More...

Protected Member Functions
	numericTerms ($leftOperand, $rightOperand)
	Simplify subtraction nodes for numeric operands. More...

Detailed Description

Factory for creating an ExpressionNode representing '-'.

Some basic simplification is applied to the resulting Node.

Member Function Documentation

MathParser\Parsing\Nodes\Factories\SubtractionNodeFactory::createUnaryMinusNode

(

$operand

)

Create a Node representing '-$operand'.

Using some simplification rules, create a NumberNode or ExpressionNode giving an AST correctly representing '-$operand'.

Simplification rules:

• To simplify the use of the function, convert integer params to NumberNodes
• If $operand is a NumberNodes, return a single NumberNode containing its negative
• If $operand already is a unary minus, 'x=-y', return y

Parameters

Node | int

$operand

Operand

Return values

Node

MathParser\Parsing\Nodes\Factories\SubtractionNodeFactory::makeNode	(		$leftOperand,
			$rightOperand
	)

Create a Node representing 'leftOperand - rightOperand'.

Using some simplification rules, create a NumberNode or ExpressionNode giving an AST correctly representing 'rightOperand - leftOperand'.

Simplification rules:

• To simplify the use of the function, convert integer params to NumberNodes
• If $rightOperand is null, return a unary minus node '-x' instead
• If $leftOperand and $rightOperand are both NumberNodes, return a single NumberNode containing their difference
• If $rightOperand is a NumberNode representing 0, return $leftOperand unchanged
• If $leftOperand and $rightOperand are equal, return '0'

Parameters

Node | int | float	$leftOperand	Minuend
Node | int | float	$rightOperand	Subtrahend

Return values

Node

Implements MathParser\Parsing\Nodes\Interfaces\ExpressionNodeFactory.

MathParser\Parsing\Nodes\Factories\SubtractionNodeFactory::numericTerms (   $leftOperand,   $rightOperand  )

protected

Simplify subtraction nodes for numeric operands.

Parameters

Node	$leftOperand
Node	$rightOperand

Return values

Node|null

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

• src/MathParser/Parsing/Nodes/Factories/SubtractionNodeFactory.php