private List <JongLocalVariable> localvariablelist = new List <JongLocalVariable>(); // list with local function variables (used during function assignment)
public static String FuncToString(JongFunction func, String strSpaceIndent, String strLineIndent, JongErrWarn errW)
{
try
{
String retStr = "";
if (func.name() == "Value")
{
retStr += func.eval();
}
else if (func.name() == "VariableGet")
{
retStr += ((JongVariableGet)func).getName();
}
else if (func.name() == "VariableAssign")
{
retStr += ((JongVariableAssign)func).getName();
retStr += " = ";
}
else
{
retStr += func.name();
}
List <JongFunction> argFuncs = func.get();
String nextSpaceIndent = (strSpaceIndent + strSpaceIndent);
foreach (JongFunction argFunc in argFuncs)
{
retStr += "\n";
retStr += (strSpaceIndent + strLineIndent);
String subStr = FuncToString(argFunc, nextSpaceIndent, strLineIndent, errW);
retStr += subStr;
}
return(retStr);
}
catch (JongError err)
{
errW.Init(ErrWStat.UNKNOWN_ERROR, err.get(), false);
return("");
}
}
/**
* Parse the given expression
* @param new_expr A string containing an expression, for example "2+3"
* @return ans A string containing the answer, or an error when
* an error occurred
*/
public String ParseAndEval(String new_expr, ICheckModelName checkModelName, JongErrWarn errW)
{
try
{
_checkModelName = checkModelName;
// initialize all variables
expr = new_expr;
ans = 0.0;
// Pare the expression into a function tree format
JongFunction function = parse_start();
String dbgString = FuncToString(function, " ", "----", errW);
dbgString += "\n";
//System.out.print(dbgString);
// evaluate the expression
ans = function.eval();
if (function is JongFunctionAssign)
{
// function assignment
JongFunctionAssign fa = (JongFunctionAssign)function;
String desc = "";
desc += fa.getName();
desc += "(";
for (int i = 0; i < fa.getVariables().Count(); i++)
{
if (i > 0)
{
desc += ", ";
}
desc += fa.getVariables().ElementAt(i).getName();
}
desc += ")";
ans_str = "Function " + desc + " defined";
}
else if (function is JongVariableAssign)
{
// variable assignment
JongVariableAssign JongVariableAssign = (JongVariableAssign)function;
ans_str = string.Format("%s = %g",
JongVariableAssign.getName(),
ans);
// add the answer to memory as variable "Ans"
variablelist["ANS"] = ans;
}
else
{
//DecimalFormat formatter = new DecimalFormat("#.##########");
ans_str = string.Format("{0:#.##########}", ans);
// add the answer to memory as variable "Ans"
variablelist["ANS"] = ans;
}
}
catch (JongError err)
{
errW.Init(ErrWStat.UNKNOWN_ERROR, err.get(), false);
ans_str = err.get();
expr = "";
}
return(ans_str);
}