private double CalculateIdentifierValue(IdentifierExp exp, Dictionary <string, DefineExp> context)
{
Dictionary <string, DefineExp> localContext = CopyContext(context);
if (localContext.ContainsKey(exp.Name) == false)
{
throw new InvalidOperationException($"В списке переменных не найдена переменная с именем {exp.Name}.");
}
if (IsPrimitive(exp))
{
return(CalculateExp(localContext[exp.Name].Children[1], localContext));
}
//function defined
var defineExp = localContext[exp.Name];
var functionSignature = (IdentifierExp)defineExp.Children[0];
for (int argumentIndex = 0; argumentIndex < functionSignature.Children.Count; argumentIndex++)
{
var functionArgument = (IdentifierExp)functionSignature.Children[argumentIndex];
var argumentSubstitution = new DefineExp();
argumentSubstitution.Children.Add(functionArgument);
double argValue = CalculateExp(exp.Children[argumentIndex], context);
argumentSubstitution.Children.Add(new DoubleExp(argValue));
localContext[functionArgument.Name] = argumentSubstitution;
}
var functionBody = defineExp.Children[1];
return(CalculateExp(functionBody, localContext));
}
private double ExecuteDefine(DefineExp exp)
{
_globalContext[exp.IdentifierName] = exp;
return(exp.IsVariable
? CalculateExp(exp.Children[1], _globalContext)
: 0);
}
