public static string[] ExtractVariablesFromEquation(string equation)
{
string[] varList = null;
if (EquationConversion.MakeEquationTree(equation) != null)
{
varList = EquationConversion.GetVariableList();
}
return(varList);
}
/*
* ConvertAndCheckInputs
* -----------------------------------------------------------------------------------
* Returns an Integer code denoting the success of the parsing and conversion process.
* Codes:
* -3 -> Equation Parsing failed
* -2 -> Variable Matching failed
* -1 -> Equation Parser Initialization failed
* 0 -> Success
*/
public static int ConvertAndCheckInputs(string eqString, string varList, OperatorStruct[] operators, string[][] terminators, string lineDelimiter, string fieldDelimiter)
{
string[] equationVars;
List <int> eqVarIndex = new List <int>();
string[] intervalVars;
List <int> ivVarIndex = new List <int>();
string[] intervalVars2;
List <int> removeIndex = new List <int>();
int index;
int success = 0;
string message = "";
EquationConversion.ResetEquationConversion();
EquationConversion.ConfigureParser(operators, terminators);
if (EquationConversion.IsReady())
{
equationTreeRoot = EquationConversion.MakeEquationTree(eqString);
if (equationTreeRoot != null)
{
if (varList != "")
{
intervalList = IntervalConversion.ConvertToIntervals(varList, lineDelimiter, fieldDelimiter);
}
intervalVars = GetVariableNamesFromIntervals(intervalList);
equationVars = EquationConversion.GetVariableList();
// Find matching variable names from the interval structures and the equation
for (int i = 0; i < equationVars.Length; i++)
{
index = Array.IndexOf(intervalVars, equationVars[i]);
if (index > -1)
{
ivVarIndex.Add(index);
eqVarIndex.Add(i);
}
}
// Found fewer matching entries in the equation
if (ivVarIndex.Count < intervalVars.Length)
{
message += "Warning: Extraneous variables found in interval list (";
// Sort list and reverse so that it is in descending order -> enables correct
// behaviour for RemoveName(string[], int)
ivVarIndex.Sort();
ivVarIndex.Reverse();
foreach (int v in ivVarIndex)
{
intervalVars = RemoveName(intervalVars, v);
}
foreach (string vName in intervalVars)
{
message += vName + ", ";
}
frm_Main.UpdateLog(message.Substring(0, message.Length - 2) + ")." + Environment.NewLine);
// Find and remove extra intervals from the list
intervalVars2 = GetVariableNamesFromIntervals(intervalList);
for (int i = 0; i < intervalVars.Length; i++)
{
index = Array.IndexOf(intervalVars2, intervalVars[i]);
if (index > -1)
{
removeIndex.Add(index);
}
}
removeIndex.Sort();
removeIndex.Reverse();
foreach (int r in removeIndex)
{
intervalList = RemoveInterval(intervalList, r);
}
}
// Found fewer matching entries in the variable list
if (eqVarIndex.Count < equationVars.Length)
{
// This is a fail state
success = -2;
message = "Error: Cannot find intervals for variable name(s): ";
foreach (int v in eqVarIndex)
{
equationVars = RemoveName(equationVars, v);
}
foreach (string vName in equationVars)
{
message += vName + ", ";
}
frm_Main.UpdateLog(message.Substring(0, message.Length - 2) + "." + Environment.NewLine);
}
}
else
{
success = -3;
}
}
else
{
frm_Main.UpdateLog("Error: Equation parser could not be configured.");
success = -1;
}
return(success);
}