public virtual void SearchAndExtractSubString(MHObjectRef success, MHSequence <MHParameter> args, MHEngine engine)
{
if (args.Size == 5)
{
// Find a substring within a string and return an index to the position
// and the prefix to the substring.
MHOctetString str = new MHOctetString();
MHOctetString searchString = new MHOctetString();
GetString(args.GetAt(0), str, engine);
int nStart = GetInt(args.GetAt(1), engine);
if (nStart < 1)
{
nStart = 1;
}
GetString(args.GetAt(2), searchString, engine);
// Strings are indexed from one.
int nPos;
for (nPos = nStart - 1; nPos <= str.Size - searchString.Size; nPos++)
{
int i;
for (i = 0; i < searchString.Size; i++)
{
if (searchString.GetAt(i) != str.GetAt(i + nPos))
{
break; // Doesn't match
}
}
if (i == searchString.Size)
{
break; // Found a match.
}
}
// Set the results.
MHParameter pResString = args.GetAt(3);
MHParameter pResInt = args.GetAt(4);
SetSuccessFlag(success, true, engine); // Set this first.
if (nPos <= str.Size - searchString.Size)
{
// Found
// Set the index to the position AFTER the string, counting from 1.
engine.FindObject(pResInt.GetReference()).SetVariableValue(new MHUnion(nPos + 1 + searchString.Size));
// Return the sequence from nStart - 1 of length nPos - nStart + 1
MHOctetString resultString = new MHOctetString(str, nStart - 1, nPos - nStart + 1);
engine.FindObject(pResString.GetReference()).SetVariableValue(new MHUnion(resultString));
}
else
{
// Not found. Set the result string to empty and the result index to -1
engine.FindObject(pResInt.GetReference()).SetVariableValue(new MHUnion(-1));
engine.FindObject(pResString.GetReference()).SetVariableValue(new MHUnion(new MHOctetString("")));
}
}
else
{
SetSuccessFlag(success, false, engine);
}
}
public virtual void SearchSubString(MHObjectRef success, MHSequence <MHParameter> args, MHEngine engine)
{
if (args.Size == 4)
{
// Find a substring within a string and return an index to the position.
MHOctetString str = new MHOctetString();
MHOctetString searchString = new MHOctetString();
GetString(args.GetAt(0), str, engine);
int nStart = GetInt(args.GetAt(1), engine);
if (nStart < 1)
{
nStart = 1;
}
GetString(args.GetAt(2), searchString, engine);
// Strings are indexed from one.
int nPos;
for (nPos = nStart - 1; nPos <= str.Size - searchString.Size; nPos++)
{
int i;
for (i = 0; i < searchString.Size; i++)
{
if (searchString.GetAt(i) != str.GetAt(i + nPos))
{
break;
}
}
if (i == searchString.Size)
{
break; // Found a match.
}
}
// Set the result.
MHParameter pResInt = args.GetAt(3);
SetSuccessFlag(success, true, engine); // Set this first.
if (nPos <= str.Size - searchString.Size)
{ // Found
// Set the index to the position of the string, counting from 1.
engine.FindObject(pResInt.GetReference()).SetVariableValue(new MHUnion(nPos + 1));
}
else
{ // Not found. Set the result index to -1
engine.FindObject(pResInt.GetReference()).SetVariableValue(new MHUnion(-1));
}
}
else
{
SetSuccessFlag(success, false, engine);
}
}
public virtual void Random(MHObjectRef success, MHSequence <MHParameter> args, MHEngine engine)
{
if (args.Size == 2)
{
int nLimit = GetInt(args.GetAt(0), engine);
MHParameter pResInt = args.GetAt(1);
Random randomGenerator = new Random();
engine.FindObject((pResInt.GetReference())).SetVariableValue(new MHUnion(randomGenerator.Next(nLimit) + 1));
SetSuccessFlag(success, true, engine);
}
else
{
SetSuccessFlag(success, false, engine);
}
}
public virtual void GetStringLength(MHObjectRef success, MHSequence <MHParameter> args, MHEngine engine)
{
if (args.Size == 2)
{
// Find a substring within a string and return an index to the position.
MHOctetString str = new MHOctetString();
GetString(args.GetAt(0), str, engine);
MHParameter pResInt = args.GetAt(1);
SetSuccessFlag(success, true, engine);
engine.FindObject(pResInt.GetReference()).SetVariableValue(new MHUnion(str.Size));
}
else
{
SetSuccessFlag(success, false, engine);
}
}
public virtual void SI_GetServiceIndex(MHObjectRef success, MHSequence <MHParameter> args, MHEngine engine)
{
// Returns an index indicating the service
if (args.Size == 2)
{
MHOctetString str = new MHOctetString();
GetString(args.GetAt(0), str, engine);
MHParameter pResInt = args.GetAt(1);
// The format of the service is dvb://netID.[transPortID].serviceID
// where the IDs are in hex.
// or rec://svc/lcn/N where N is the "logical channel number" i.e. the Freeview channel.
int nResult = engine.GetContext().GetChannelIndex(str.ToString());
engine.FindObject(pResInt.GetReference()).SetVariableValue(new MHUnion(nResult));
Logging.Log(Logging.MHLogDetail, "Get service index for " + str.Printable() + " - result " + nResult);
SetSuccessFlag(success, true, engine);
}
else
{
SetSuccessFlag(success, false, engine);
}
}
public virtual void GetSubString(MHObjectRef success, MHSequence <MHParameter> args, MHEngine engine)
{
if (args.Size == 4)
{
// Extract a sub-string from a string.
MHOctetString str = new MHOctetString();
GetString(args.GetAt(0), str, engine);
int nBeginExtract = GetInt(args.GetAt(1), engine);
int nEndExtract = GetInt(args.GetAt(2), engine);
if (nBeginExtract < 1)
{
nBeginExtract = 1;
}
if (nBeginExtract > str.Size)
{
nBeginExtract = str.Size;
}
if (nEndExtract < 1)
{
nEndExtract = 1;
}
if (nEndExtract > str.Size)
{
nEndExtract = str.Size;
}
MHParameter pResString = args.GetAt(3);
// Returns beginExtract to endExtract inclusive.
engine.FindObject(pResString.GetReference()).SetVariableValue(
new MHUnion(new MHOctetString(str, nBeginExtract - 1, nEndExtract - nBeginExtract + 1)));
SetSuccessFlag(success, true, engine);
}
else
{
SetSuccessFlag(success, false, engine);
}
}
public virtual void FormatDate(MHObjectRef success, MHSequence <MHParameter> args, MHEngine engine)
{
if (args.Size == 4)
{
// This is a bit like strftime but not quite.
MHOctetString format = new MHOctetString();
GetString(args.GetAt(0), format, engine);
int date = GetInt(args.GetAt(1), engine); // As produced in GCD
int time = GetInt(args.GetAt(2), engine);
string result = "";
DateTime dt = new DateTime(1858, 11, 17);
dt = dt.AddDays(date).AddSeconds(time);
for (int i = 0; i < format.Size; i++)
{
char ch = format.GetAt(i);
string part; // Largest text is 4 chars for a year + null terminator
if (ch == '%')
{
i++;
if (i == format.Size)
{
break;
}
ch = format.GetAt(i);
switch (ch)
{
case 'Y': part = dt.ToString("yyyy"); break;
case 'y': part = dt.ToString("yy"); break;
case 'X': part = dt.ToString("MM"); break;
case 'x': part = dt.ToString("%M"); break;
case 'D': part = dt.ToString("dd"); break;
case 'd': part = dt.ToString("%d"); break;
case 'H': part = dt.ToString("HH"); break;
case 'h': part = dt.ToString("%H"); break;
case 'I': part = dt.ToString("hh"); break;
case 'i': part = dt.ToString("%h"); break;
case 'M': part = dt.ToString("mm"); break;
case 'm': part = dt.ToString("%m"); break;
case 'S': part = dt.ToString("ss"); break;
case 's': part = dt.ToString("%s"); break;
// TODO: These really should be localised.
case 'A': part = dt.ToString("tt"); break;
case 'a': part = dt.ToString("tt").ToLower(); break;
default: part = ""; break;
}
result += part;
}
else
{
result += ch;
}
}
MHOctetString theResult = new MHOctetString(result);
MHParameter pResString = args.GetAt(3);
engine.FindObject(pResString.GetReference()).SetVariableValue(new MHUnion(theResult));
SetSuccessFlag(success, true, engine);
}
else
{
SetSuccessFlag(success, false, engine);
}
}