public static P5Scalar Open3Args(Runtime runtime, P5Scalar target, string open_mode, P5Scalar value)
{
FileMode mode;
FileAccess access;
bool is_read = false, is_write = false, truncate = false;
switch (open_mode)
{
case ">":
mode = FileMode.OpenOrCreate;
access = FileAccess.Write;
is_write = truncate = true;
break;
case "<":
mode = FileMode.Open;
access = FileAccess.Read;
is_read = true;
break;
case ">>":
mode = FileMode.Append;
access = FileAccess.Write;
is_write = true;
break;
case "+>":
mode = FileMode.OpenOrCreate;
access = FileAccess.ReadWrite;
is_read = is_write = truncate = true;
break;
case "+<":
mode = FileMode.OpenOrCreate;
access = FileAccess.ReadWrite;
is_read = is_write = true;
break;
default:
throw new P5Exception(runtime, string.Format("Unknown open() mode '{0}'", open_mode));
}
FileStream filestream;
try
{
filestream = new FileStream(value.AsString(runtime), mode, access);
if (truncate)
filestream.SetLength(0);
}
catch (IOException)
{
// TODO set $!
return new P5Scalar(runtime, false);
}
// TODO handle encoding
var handle = new P5Handle(
runtime,
is_read ? new StreamReader(filestream) : null,
is_write ? new StreamWriter(filestream) : null);
target.SetHandle(runtime, handle);
return new P5Scalar(runtime, true);
}