C# Class GSF.Parsing.BooleanExpression

Represents a boolean expression that can be parsed and executed at runtime.

Binary operators have the same level of precedence and are evaluated from right to left.

Public Methods

Method	Description
BooleanExpression ( string expressionText ) : System	Creates a new instance of the BooleanExpression class. The default comparer for identifiers is StringComparer.OrdinalIgnoreCase.
BooleanExpression ( string expressionText, IEqualityComparer identifierComparer ) : System	Creates a new instance of the BooleanExpression class.
Evaluate ( ) : bool	Evaluates the expression using the current values of the variables.
TryGetVariable ( string identifier, Variable &variable ) : bool	Attempts to get the variable identified by the given identifier.
this ( string identifier ) : Variable	Gets the variable identified by the given identifier.

Method	Description
ParseExpression ( StringBuilder builder ) : Expression
ParseIdentifier ( StringBuilder builder ) : Expression
ParseSubexpression ( StringBuilder builder ) : Expression
ShedWhitespace ( StringBuilder builder ) : void

Creates a new instance of the BooleanExpression class.

The default comparer for identifiers is StringComparer.OrdinalIgnoreCase.

public BooleanExpression ( string expressionText ) : System
expressionText	string	The expression text to be parsed as a boolean expression.
return	System

Creates a new instance of the BooleanExpression class.

public BooleanExpression ( string expressionText, IEqualityComparer identifierComparer ) : System
expressionText	string	The expression text to be parsed as a boolean expression.
identifierComparer	IEqualityComparer	Comparer used to compare identifiers.
return	System

Evaluates the expression using the current values of the variables.

public Evaluate ( ) : bool
return	bool

Attempts to get the variable identified by the given identifier.

public TryGetVariable ( string identifier, Variable &variable ) : bool
identifier	string	The identifier used to refer to the variable.
variable	Variable	The variable identified by the given identifier.
return	bool

Gets the variable identified by the given identifier.

public this ( string identifier ) : Variable
identifier	string	The identifier used to refer to the variable.
return	Variable