/// <summary>
/// Standard way to convert to a Ruby Integer, using to_int and to_i
/// Trys to call to_int, followed by to_i (if implemented).
/// If neither is callable, throws a type error.
/// </summary>
public static void ConvertToInteger(RubyContext /*!*/ context, object obj, out int fixnum, out BigInteger bignum)
{
// Don't call to_int, to_i on primitive types:
if (AsPrimitiveInteger(obj, out fixnum, out bignum))
{
return;
}
if (RubySites.RespondTo(context, obj, "to_int"))
{
object result = _ToInt.Target(_ToInt, context, obj);
if (AsPrimitiveInteger(result, out fixnum, out bignum))
{
return;
}
throw RubyExceptions.MethodShouldReturnType(context, obj, "to_int", "Integer");
}
if (RubySites.RespondTo(context, obj, "to_i"))
{
object result = _ToI.Target(_ToI, context, obj);
if (AsPrimitiveInteger(result, out fixnum, out bignum))
{
return;
}
throw RubyExceptions.MethodShouldReturnType(context, obj, "to_i", "Integer");
}
throw RubyExceptions.CannotConvertTypeToTargetType(context, obj, "Integer");
}
/// <summary>
/// Convert to a Float, using to_f
/// Throws if conversion fails
/// </summary>
public static double ConvertToFloat(RubyContext /*!*/ context, object value)
{
if (value == null)
{
throw RubyExceptions.CreateTypeError("can't convert nil into Float");
}
if (value is int || value is double)
{
return(Converter.ConvertToDouble(value));
}
if (value is BigInteger)
{
return(((BigInteger)value).ToFloat64());
}
if (value is MutableString)
{
return(ConvertStringToFloat(context, (MutableString)value));
}
if (RubySites.RespondTo(context, value, "to_f"))
{
object obj = _ToF.Target(_ToF, context, value);
if (!(obj is double))
{
throw RubyExceptions.MethodShouldReturnType(context, value, "to_f", "Float");
}
return((double)obj);
}
throw RubyExceptions.CannotConvertTypeToTargetType(context, value, "Float");
}
public IOWrapper(RubyContext /*!*/ context, object /*!*/ obj, FileAccess access)
{
_context = context;
_obj = obj;
if (access == FileAccess.Read || access == FileAccess.ReadWrite)
{
_canRead = RubySites.RespondTo(context, obj, "read");
}
else
{
_canRead = false;
}
if (access == FileAccess.Write || access == FileAccess.ReadWrite)
{
_canWrite = RubySites.RespondTo(context, obj, "write");
}
else
{
_canWrite = false;
}
_canSeek = (RubySites.RespondTo(context, obj, "seek") && RubySites.RespondTo(context, obj, "tell"));
_buffer = new byte[_bufferSize];
_writePos = 0;
_readPos = 0;
_readLen = 0;
}
private object RequireWriteProtocol(RubyContext /*!*/ context, object value, string /*!*/ variableName)
{
if (!RubySites.RespondTo(context, value, "write"))
{
throw RubyExceptions.CreateTypeError(String.Format("${0} must have write method, {1} given", variableName, RubyUtils.GetClassName(context, value)));
}
return(value);
}
public static object Tagurize(RubyContext context, RubyModule self, object arg)
{
if (arg == null)
{
return(null);
}
if (RubySites.RespondTo(context, arg, "to_str"))
{
return(MutableString.Create("tag:yaml.org,2002:").Append(Protocols.ConvertToString(context, arg)));
}
return(arg);
}
/// <summary>
/// Try to cast the object to an Integer using to_int
/// Returns null if the object doesn't implement to_int
/// Can return either Bignum or Fixnum
/// </summary>
public static bool AsInteger(RubyContext /*!*/ context, object obj, out int fixnum, out BigInteger bignum)
{
// Don't call to_int on types derived from Integer
if (AsPrimitiveInteger(obj, out fixnum, out bignum))
{
return(true);
}
if (RubySites.RespondTo(context, obj, "to_int"))
{
object result = _ToInt.Target(_ToInt, context, obj);
if (AsPrimitiveInteger(result, out fixnum, out bignum))
{
return(true);
}
throw RubyExceptions.InvalidValueForType(context, result, "Integer");
}
return(false);
}
/// <summary>
/// Standard way to convert to a Ruby String, using to_str
///
/// Checks if it's already a string, and if so returns it.
/// Then calls to_str if it exists, otherwise returns null
/// </summary>
public static MutableString AsString(RubyContext /*!*/ context, object obj)
{
MutableString str = obj as MutableString;
if (str != null)
{
return(str);
}
if (RubySites.RespondTo(context, obj, "to_str"))
{
str = _ToStr.Target(_ToStr, context, obj) as MutableString;
if (str != null)
{
return(str);
}
throw RubyExceptions.MethodShouldReturnType(context, obj, "to_str", "String");
}
return(null);
}
/// <summary>
/// Try to convert obj to an Array using #to_ary
/// 1. If obj is an Array (or a subtype), returns it
/// 2. Calls to_ary if it exists, possibly throwing if to_ary doesn't return an Array
/// 3. else returns null
/// </summary>
public static IList AsArray(RubyContext /*!*/ context, object obj)
{
// Don't call to_a on types derived from Array
IList ary = obj as IList;
if (ary != null)
{
return(ary);
}
if (RubySites.RespondTo(context, obj, "to_ary"))
{
object result = _ToAry.Target(_ToAry, context, obj);
ary = result as IList;
if (ary != null)
{
return(ary);
}
throw RubyExceptions.MethodShouldReturnType(context, obj, "to_ary", "Array");
}
return(null);
}
