/// <summary>Create an instance of a <see cref="Calculator"/> which has it's own operators and variables.</summary>
/// <param name="context">The math context.</param>
/// <param name="variables">A collection of variables.</param>
public Calculator(IMathContext context, IVariablesCollection?variables = default)
{
context.EnsureNotNull(nameof(context));
_mathContext = context;
_evaluator = new ExpressionEvaluator(_mathContext, this);
this["PI"] = Math.PI;
this["E"] = Math.E;
variables?.CopyTo(this);
}
/// <summary>Initializez a new instance of an expression optimizer.</summary>
/// <param name="mathContext">The math context used to evaluate expressions.</param>
public ExpressionOptimizer(IMathContext mathContext)
{
mathContext.EnsureNotNull(nameof(mathContext));
_context = mathContext;
_expressionOptimizers = new Dictionary <ExpressionType, Func <IExpression, IExpression> >
{
[ExpressionType.BinaryExpression] = OptimizeBinaryExpression,
[ExpressionType.UnaryExpression] = EvaluateUnaryExpression,
[ExpressionType.ConstantExpression] = OptimizeConstantExpression,
[ExpressionType.GroupingExpression] = OptimizeGroupingExpression,
[ExpressionType.VariableExpression] = SkipExpressionOptimization,
[ExpressionType.ValueExpression] = SkipExpressionOptimization
};
}
/// <summary>Initializez a new instance of an expression evaluator.</summary>
/// <param name="context">The math context.</param>
/// <param name="variables">The variables collection.</param>
public ExpressionEvaluator(IMathContext context, IVariablesCollection variables)
{
context.EnsureNotNull(nameof(context));
variables.EnsureNotNull(nameof(variables));
_variables = variables;
_context = context;
_expressionEvaluators = new Dictionary <ExpressionType, Func <IExpression, ValueExpression> >
{
[ExpressionType.BinaryExpression] = EvaluateBinaryExpression,
[ExpressionType.UnaryExpression] = EvaluateUnaryExpression,
[ExpressionType.ConstantExpression] = EvaluateConstantExpression,
[ExpressionType.GroupingExpression] = EvaluateGroupingExpression,
[ExpressionType.VariableExpression] = EvaluateVariableExpression
};
}