Optional class

For the MostSpecificSelector, this is a short hand so that instead of having to do A & B || A you can do A & optional(B) to mean the same thing.

Extends

Constructors

Optional()

Initializes a new instance of the Optional class.

Properties

negation

Gets the evaluator that is a negation of this one. Sets the evaluator that is a negation of this one.

Inherited Properties

returnType

Type expected by evaluating the expression.

type

Gets the expression type for evaluator.

Inherited Methods

tryEvaluate(Expression, MemoryInterface, Options)

Evaluate an expression.

validateExpression(Expression)

Validate an expression.

Constructor Details

Optional()

Initializes a new instance of the Optional class.

new Optional()

Property Details

negation

Gets the evaluator that is a negation of this one. Sets the evaluator that is a negation of this one.

ExpressionEvaluator negation

Property Value

The evaluator that is a negation of this one.

Inherited Property Details

returnType

Type expected by evaluating the expression.

returnType: ReturnType

Property Value

Inherited From ExpressionEvaluator.returnType

type

Gets the expression type for evaluator.

type: string

Property Value

string

Inherited From ExpressionEvaluator.type

Inherited Method Details

tryEvaluate(Expression, MemoryInterface, Options)

Evaluate an expression.

function tryEvaluate(expression: Expression, state: MemoryInterface, options: Options): ValueWithError

Parameters

expression
Expression

Expression to evaluate.

state
MemoryInterface

Global state information.

options
Options

Options used in the evaluation.

Returns

The value and error string that is non-null if there is an error.

Inherited From ExpressionEvaluator.tryEvaluate

validateExpression(Expression)

Validate an expression.

function validateExpression(expression: Expression)

Parameters

expression
Expression

Expression to validate.

Inherited From ExpressionEvaluator.validateExpression