static SimpleMaths()
{
var number = Terminals.Double("Number");
var expression = Nonterminal.Create <double>("Expression");
expression.SetProductions(
number.AsIs(),
expression.Extended().Append("+").Extend(expression).Finish((x1, x2) => x1 + x2),
expression.Extended().Append("-").Extend(expression).Finish((x1, x2) => x1 - x2),
expression.Extended().Append("*").Extend(expression).Finish((x1, x2) => x1 * x2),
expression.Extended().Append("/").Extend(expression).Finish((x1, x2) => x1 / x2),
"-".Appended().Extend(expression).WithPrecedence(out var NEG).Finish(x => - x),
expression.Extended().Append("^").Extend(expression).Finish(Math.Pow),
"(".Appended().Extend(expression).Append(")").AsIs());
var opScope = new OperatorScope(
new LeftAssociative("+", "-"),
new LeftAssociative("*", "/"),
new PrecedenceOnly(NEG),
new RightAssociative("^"));
Designtime = expression.WithOperatorScope(opScope);
Runtime = Designtime.Build();
}
/// <summary> /// Converts the <see cref="sourceValue" /> parameter to the <see cref="destinationType" /> parameter using <see cref="formatProvider" /// /> and <see cref="ignoreCase" /> /// </summary> /// <param name="sourceValue">the <see cref="System.Object"/> to convert from</param> /// <param name="destinationType">the <see cref="System.Type" /> to convert to</param> /// <param name="formatProvider">not used by this TypeConverter.</param> /// <param name="ignoreCase">when set to <c>true</c>, will ignore the case when converting.</param> /// <returns> /// an instance of <see cref="OperatorScope" />, or <c>null</c> if there is no suitable conversion. /// </returns> public override object ConvertFrom(object sourceValue, global::System.Type destinationType, global::System.IFormatProvider formatProvider, bool ignoreCase) => OperatorScope.CreateFrom(sourceValue);
