expression.helper library

Functions

applyOperation(String operator, List<double> values) → void

Applies the given operator to the top two values in the values stack.

evaluateExpression(String expression) → double

Evaluates an arithmetic expression and returns the result as a double.

isCharDigitOrDecimalPointOrPercentage(String s) → bool

isNegativeUnaryOperator(String expression, int index) → bool

isOperator(String s) → bool

Returns true if s represents an arithmetic operator, false otherwise.

parseSimpleOperation(String expression) → TSimpleOperation?

Parses a simple mathematical operation expression and returns a TSimpleOperation object that represents the operation.

precedence(String operator) → int

Returns an integer representing the precedence level of the given operator.