private double doFunction(int beg, int end) {
int argbeg;
for (argbeg = beg; argbeg <= end && expression.charAt(argbeg) != '('; argbeg++) {;
}
String fncnam = expression.substring(beg, argbeg).trim();
ArgParser fncargs = new ArgParser(argbeg, end);
FunctionHandler fnchdl = null;
try {
if ((fnchdl = pureFunctions.get(fncnam)) != null) {
return fnchdl.evaluateFunction(fncnam, fncargs);
} else if ((fnchdl = impureFunctions.get(fncnam)) != null) {
isConstant = false; // impure functions cannot be guaranteed to be constant
return fnchdl.evaluateFunction(fncnam, fncargs);
}
fncargs = null; // suppress check for too many fncargs
} catch (ArithmeticException thr) {
fncargs = null;
throw thr;
} catch (NoSuchMethodError thr) {
fncargs = null;
throw exception(beg, "Function not supported in this JVM: \"" + fncnam + "\"");
} catch (UnsupportedOperationException thr) {
fncargs = null;
throw exception(beg, thr.getMessage());
} catch (Throwable thr) {
fncargs = null;
throw exception(beg, "Unexpected exception parsing function arguments", thr);
} finally {
if (fncargs != null) {
if (fncargs.hasNext()) {
throw exception(fncargs.getIndex(), "Function has too many arguments");
}
offset = fncargs.getIndex();
}
}
throw exception(beg, "Function \"" + fncnam + "\" not recognized");
}
