|
static private Parse ( |
||
| instance | The root object | |
| typeName | string | Type to cast to |
| cseData | Expression to cast | |
| return | ||
///
/// <summary>
/// Applies numeric negation (i.e. unary minus) to numeric values
/// </summary>
///
/// <param name="obj">The CseObject with the value to negate</param>
///
/// <returns>The CseObject after negation</returns>
///
/// <exception cref="CseLogicExceptionType.CANT_NEGATE_NON_NUM" />
/// <exception cref="CseLogicExceptionType.ERROR_NEGATING_VALUE_OF_TYPE" />
///
internal static CseObject Negate(CseObject obj)
{
CseObject result = (CseObject)obj.Clone();
dynamic value = obj.Value;
double numValue;
if (value is string)
{
throw new CseLogicException(CseLogicExceptionType.CANT_NEGATE_NON_NUM, value.ToString());
}
else if (!double.TryParse(value.ToString(), out numValue))
{
MethodInfo mi = value.GetType().GetMethod(OpOverloadNames.UMINUS);
if (null != mi)
{
result.Value = value.GetType().InvokeMember(OpOverloadNames.UMINUS, OpOverloadNames.Flags, null, CsEval.evalEnvironment, new object[] { value });
return(result);
}
else
{
throw new CseLogicException(CseLogicExceptionType.CANT_NEGATE_NON_NUM, value.ToString());
}
}
numValue *= -1;
result.Value = numValue;
try {
result = CastExp.Parse(CsEval.evalEnvironment, value.GetType().Name, result);
}
catch {
if (value.ToString().ToLower().Contains("e"))
{
result = LiteralExp.ParseEType(numValue.ToString());
}
else if (value.ToString().Contains("."))
{
result = LiteralExp.ParseFloatType(numValue.ToString(), null);
}
else
{
throw new CseLogicException(CseLogicExceptionType.ERROR_NEGATING_VALUE_OF_TYPE, value.ToString(), value.GetType().Name);
}
}
return(result);
}
///
/// <summary>
/// Parses method calls
/// </summary>
///
/// <param name="environment">The environment containing the method</param>
/// <param name="methName">Name of the method</param>
/// <param name="args">CseObject array containing arguments to be sent to the method. Each CseObject is one argument</param>
///
/// <returns>CseObject containing the return result of the method call or CseObject containing null if method is void</returns>
///
/// <exception cref="CseLogicExceptionType.METHOD_CALL_AMBIGUOUS" />
/// <exception cref="CseLogicExceptionType.METHOD_CANT_IMPLICITLY_COERCE_ARGS" />
/// <exception cref="CseLogicExceptionType.METHOD_DOESNT_EXIST" />
/// <exception cref="CseLogicExceptionType.METHOD_EXISTS_BUT_CANT_BE_INVOKED" />
///
public static CseObject Parse(CseObject environment, string methName, List <CseObject> args)
{
MethResSettings mrSettings = new MethResSettings()
{
Args = (args == null ? new CseObject[] { } : args.ToArray()),
Env = environment.Value,
Name = methName
};
List <MethResObject> appMeths = MethRes.GetApplicableMembers(mrSettings);
if (appMeths.Count == 0)
{
mrSettings.IsExtInvocation = true;
appMeths = MethRes.GetApplicableMembers(mrSettings);
}
MethodInfo mi = null;
Type envType = TypeExp.GetTypeObj(environment.Value);
try {
switch (appMeths.Count)
{
// No methods exist with that name
case 0:
// TODO: doesn't exist OR no applicable methods can be called
throw new CseLogicException(CseLogicExceptionType.METHOD_DOESNT_EXIST, methName);
// Only 1 method exists with that name, so try to do what's necessary to coerce args (if they exist)
// to match its signature.
case 1:
MethResObject mrObj = appMeths[0];
if (args != null)
{
for (int i = 0; i < args.Count; i++)
{
try {
args[i] = CastExp.Parse(environment, mrObj.MethInfo.GetParameters()[i].ParameterType.Name, args[i]);
}
catch (CseLogicException) {
// f**k it, continue
}
}
}
//NarrowAllIntTypes(ref args);
mi = mrObj.MethInfo;
break;
// Method is overloaded.
// Idea is to simulate C#'s best match algorithm for finding the most appropriate method to call
// and if still unsure, throw exception so user can use casting for further clarification.
default:
Type[] types = GetTypeArray(args);
mi = envType.GetMethod(methName, findFlags | BindingFlags.ExactBinding, null, types, null);
if (mi != null)
{
break;
}
if (CanCoerce(args))
{
NarrowAllIntTypes(ref args);
types = GetTypeArray(args);
}
MethodInfo tryMeth = envType.GetMethod(methName, findFlags, null, types, null);
foreach (MethResObject m in appMeths)
{
if (m.MethInfo == tryMeth)
{
mi = tryMeth;
break;
}
}
if (mi != null)
{
break;
}
// TODO: Attempt to coerce args to formal param types of overloaded methods
if (mi == null)
{
throw new CseLogicException(CseLogicExceptionType.METHOD_CALL_AMBIGUOUS, methName);
}
break;
}
}
catch (AmbiguousMatchException) {
throw new CseLogicException(CseLogicExceptionType.METHOD_CALL_AMBIGUOUS, methName);
}
catch (CseLogicException) {
throw;
}
catch {
throw new CseLogicException(CseLogicExceptionType.METHOD_EXISTS_BUT_CANT_BE_INVOKED, methName);
}
if (mi == null)
{
throw new CseLogicException(CseLogicExceptionType.METHOD_EXISTS_BUT_CANT_BE_INVOKED, methName);
}
else
{
dynamic result = mi.Invoke(environment.Value, GetObjArgs(args));
CseObject xo = new CseObject(result);
xo.CompileTimeType = mi.ReturnType;
if (args != null)
{
foreach (CseObject arg in args)
{
if (arg.CallMod != CallArgMod.VAL)
{
AssignExp.Parse(arg.EnvChain, arg.EnvNames, arg.EnvIndices, arg.Value);
}
}
}
return(xo);
}
}