internal static bool IsStartOfConstant(string s)
{
foreach (string constant in EquationFunctions.GetFunctions(0))
{
if (constant.StartsWith(s))
{
return(true);
}
}
return(false);
}
internal static bool IsConstant(string s)
{
return(EquationFunctions.GetFunctions(0).Contains(s));
}
private static IEquation ParseSingleEquation(SegmentData sD, Action <string> errorCallback)
{
string s = sD.Data;
switch (sD.Type)
{
case SegmentType.Number:
return(new Constant(float.Parse(s)));
case SegmentType.Variable:
return(new Variable(int.Parse(s.Substring(1, s.Length - 2))));
case SegmentType.EquationVariable:
return(new EquationVariable(int.Parse(s.Substring(1, s.Length - 2))));
case SegmentType.Constant:
return(EquationFunctions.CreateFunction(s, new IEquation[0]));
case SegmentType.Function: {
int functionBodyStartIndex = s.IndexOf('(');
int functionBodyEndIndex = s.LastIndexOf(')');
if (functionBodyStartIndex == -1)
{
errorCallback($"Function call '{s}' at {sD.Index} has no body.");
return(null);
}
string functionName = s.Substring(0, functionBodyStartIndex);
string functionBody = s.Substring(functionBodyStartIndex, s.Length - functionBodyStartIndex);
bool isOperator = functionName.StartsWith("op_");
if (isOperator)
{
functionName = functionName.Substring(3, functionName.Length - 3);
}
if (functionBodyEndIndex == -1)
{
errorCallback($"Function body '{functionBody}' of function '{functionName}' at {sD.Index} has no end to its body.");
return(null);
}
if (functionBodyEndIndex != s.Length - 1)
{
errorCallback($"Function body '{functionBody}' of function '{functionName}' at {sD.Index} has an invalid body.");
return(null);
}
bool invalidParPlacement;
functionBody = RemoveOuterParentheses(functionBody, out invalidParPlacement);
if (invalidParPlacement)
{
errorCallback($"Invalid parenthesis placement in function body '{functionBody}' of function '{functionName}' at {sD.Index}.");
return(null);
}
//int functionParameterCount;
//if (isOperator)
// functionParameterCount = EquationOperators.GetOperatorParameterCount(functionName);
//else
// functionParameterCount = EquationFunctions.GetFunctionParameterCount(functionName);
string[] parametersS = SplitParameters(functionBody);
int functionParameterCount = parametersS.Length;
//if (functionParameterCount != parametersS.Length) {
// errorCallback($"Cannot parse function '{s}', invalid number of parameters ({parametersS.Length} - expected {functionParameterCount}.");
// return null;
//}
IEquation[] parameterEquations = new IEquation[functionParameterCount];
for (int fpc = 0; fpc < functionParameterCount; fpc++)
{
parameterEquations[fpc] = ParseEquation(parametersS[fpc], errorCallback);
}
IEquation functionEquation;
if (isOperator)
{
functionEquation = EquationOperators.CreateOperator(functionName, parameterEquations);
}
else
{
functionEquation = EquationFunctions.CreateFunction(functionName, parameterEquations);
}
if (functionEquation == null)
{
errorCallback($"No function of name '{functionName}' with {functionParameterCount} parameters exists. Error at {sD.Index}.");
return(null);
}
return(functionEquation);
}
}
errorCallback($"Cannot parse equation '{s}' at {sD.Index}.");
return(null);
}
