/// <summary>
/// Initializes a new instance of the <see cref="MathExpressionParameterlessFunctionNode"/> class.
/// </summary>
/// <param name="expressionTypeId">The expression type identifier.</param>
/// <param name="functionNameFragment">The function name fragment.</param>
/// <param name="function">The function to evaluate function value.</param>
/// <param name="valueTypeId">The value type identifier.</param>
public MathExpressionParameterlessFunctionNode(
string expressionTypeId,
ISourceCodeFragment functionNameFragment,
Func <object> function,
string valueTypeId = null)
: base(ExpressionTypeDescriptor.CreateExpressionClass(expressionTypeId, valueTypeId), functionNameFragment)
{
_function = function;
}
private static ExpressionTypeDescriptor CreateExpressionType(string ruleName, string valueTypeId = null)
{
if (String.IsNullOrEmpty(ruleName))
{
Guard.ArgNullOrEmpty(valueTypeId, nameof(valueTypeId));
return(ExpressionTypeDescriptor.Undefined);
}
return(ExpressionTypeDescriptor.CreateExpressionClass(ruleName, valueTypeId));
}
private IParsingProduct GetFunction(
ISourceCodeFragment functionName,
string expressionTypeId,
IEnumerable <IParsingProduct> arguments)
{
if (!_functionsByNameByArgCount.TryGetValue(functionName, out var functionByArgsCount))
{
return(null);
}
var args = arguments?.ToArray() ?? Array.Empty <IParsingProduct>();
if (!functionByArgsCount.TryGetValue(args.Length, out var func))
{
return(null);
}
return(new MathExpressionFunctionNode(ExpressionTypeDescriptor.CreateExpressionClass(expressionTypeId), functionName, args, func));
}
/// <summary>
/// Initializes a new instance of the <see cref="MathExpressionValueNode"/> class.
/// </summary>
/// <param name="expressionTypeId">The expression type identifier.</param>
/// <param name="valueFragment">The source code fragment that represents the value.</param>
/// <param name="value">The value.</param>
/// <param name="valueTypeId">The value type identifier.</param>
public MathExpressionValueNode(string expressionTypeId, ISourceCodeFragment valueFragment, object value, string valueTypeId = null)
: base(ExpressionTypeDescriptor.CreateExpressionClass(expressionTypeId, valueTypeId), valueFragment)
{
_value = value;
}
