Description

The ExpressionCalculator class allows you to create an expression calculator.

Constructors

Constructs this class and assigns an expression string.

ExpressionCalculator([String? expression])

• expression: String? - expression string.

Properties

autoVariables

Gets the flag to turn on auto-creation of variables for a specified expression.

bool get autoVariables

• returns: bool - returns the flag to turn on auto-creation.

Sets the flag to turn on auto-creation of variables for a specified expression.

set autoVariables(bool value)

• value: bool - flag to turn on auto-creation.

defaultFunctions

List with default functions.

IFunctionCollection get defaultFunctions

• returns: IFunctionCollection - list with default functions.

defaultVariables

List with default variables.

IVariableCollection get defaultVariables

• returns: IVariableCollection - list with default variables.

expression

Expression string.

String? get expression

• returns: String? - expression string.

set expression(String? value)

• value: String? - expression string.

initialTokens

List of original expression tokens.

List<ExpressionToken> get initialTokens

• returns: List<ExpressionToken> - list of original expression tokens.

originalTokens

List of expression tokens.

List<Token> get originalTokens

• returns: Token - list of expression tokens.

set originalTokens(List<Token> value)

• value: Token - list of expression tokens.

resultTokens

List of processed expression tokens.

List<ExpressionToken> get resultTokens

• returns: List<ExpressionToken> - list of processed expression tokens.

variantOperations

Gets the manager for operations on variant values.

IVariantOperations get variantOperations

• returns: IVariantOperations - manager for operations.

Sets the manager for operations on variant values.

set variantOperations(IVariantOperations value)

• value: IVariantOperations - manager for operations.

Instance methods

clear

Cleans up this calculator from all data.

void clear()

createVariables

Cleans up this calculator from all data.

void createVariables(IVariantOperations variables)

• variables: IVariantOperations - list of variables to be populated.

evaluate

Evaluates this expression using default variables and functions.

Future<Variant> evaluate()

• returns: Future<Variant> - evaluation result.

evaluateWithVariables

Evaluates this expression using specified variables.

Future<Variant> evaluateWithVariables(IVariantOperations variables)

• variables: IVariantOperations - list of variables.
• returns: Future<Variant> - evaluation result.

evaluateWithVariablesAndFunctions

Evaluates this expression using specified variables and functions.

Future<Variant> evaluateWithVariablesAndFunctions(IVariantOperations? variables, IFunctionCollection? functions)

• variables: IVariantOperations? - list of variables.
• functions: IFunctionCollection? - list of functions
• returns: Future<Variant> - evaluation result.