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);
}
}
// UK MHEG. Interpret the font attributes.
protected void InterpretAttributes(MHOctetString attrs, out int style, out int size, out int lineSpace, out int letterSpace)
{
// Set the defaults.
style = 0; size = 0x18; lineSpace = 0x18; letterSpace = 0;
if (attrs.Size == 5) // Short form.
{
style = attrs.GetAt(0); // Only the bottom nibble is significant.
size = attrs.GetAt(1);
lineSpace = attrs.GetAt(2);
// Is this big-endian or little-endian? Assume big.
letterSpace = attrs.GetAt(3) * 256 + attrs.GetAt(4);
if (letterSpace > 32767)
{
letterSpace -= 65536; // Signed.
}
}
else // Textual form.
{
String str = attrs.ToString() + ".";
Logging.Assert(str != null);
int q = str.IndexOf('.'); // Find the terminating dot
if (q != -1) // plain, italic etc.
{
string type = str.Substring(0, q);
str = str.Substring(q + 1);
if (type.Equals("italic"))
{
style = 1;
}
else if (type.Equals("bold"))
{
style = 2;
}
else if (type.Equals("bold-italic"))
{
style = 3;
}
// else it's plain.
q = str.IndexOf('.');
}
if (q != -1) // Size
{
string s = str.Substring(0, q);
str = str.Substring(q + 1);
size = Convert.ToInt32(s);
if (size == 0)
{
size = 0x18;
}
q = str.IndexOf('.'); // Find the next dot.
}
if (q != -1) // lineSpacing
{
string ls = str.Substring(0, q);
str = str.Substring(q + 1);
lineSpace = Convert.ToInt32(ls);
if (lineSpace == 0)
{
size = 0x18;
}
q = str.IndexOf('.'); // Find the next dot.
}
if (q != -1) // letter spacing. May be zero or negative
{
string ls = str.Substring(0, q);
letterSpace = Convert.ToInt32(ls);
}
}
}
// UK MHEG specifies the use of the Tiresias font and broadcasters appear to
// assume that all MHEG applications will lay the text out in the same way.
// Recreate the image.
protected void Redraw()
{
if (!RunningStatus || m_pDisplay == null)
{
return;
}
if (m_nBoxWidth == 0 || m_nBoxHeight == 0)
{
return; // Can't draw zero sized boxes.
}
m_pDisplay.SetSize(m_nBoxWidth, m_nBoxHeight);
m_pDisplay.Clear();
MHRgba textColour = GetColour(m_textColour);
// Process any escapes in the text and construct the text arrays.
MHSequence <MHTextLine> theText = new MHSequence <MHTextLine>();
// Set up the first item on the first line.
MHTextItem pCurrItem = new MHTextItem();
MHTextLine pCurrLine = new MHTextLine();
pCurrLine.Items.Append(pCurrItem);
theText.Append(pCurrLine);
Stack <MHRgba> m_ColourStack = new Stack <MHRgba>(); // Stack to handle nested colour codes.
m_ColourStack.Push(textColour);
pCurrItem.Colour = textColour;
int i = 0;
while (i < m_Content.Size)
{
char ch = m_Content.GetAt(i++);
if (ch == '\t') // Tab - start a new item if we have any text in the existing one.
{
if (pCurrItem.Text.Size != 0)
{
pCurrItem = pCurrItem.NewItem();
pCurrLine.Items.Append(pCurrItem);
}
pCurrItem.TabCount++;
}
else if (ch == '\r') // CR - line break.
// TODO: Two CRs next to one another are treated as </P> rather than <BR><BR>
// This should also include the sequence CRLFCRLF.
{
pCurrLine = new MHTextLine();
theText.Append(pCurrLine);
pCurrItem = pCurrItem.NewItem();
pCurrLine.Items.Append(pCurrItem);
}
else if (ch == 0x1b) // Escape - special codes.
{
if (i == m_Content.Size)
{
break;
}
char code = m_Content.GetAt(i);
// The only codes we are interested in are the start and end of colour.
// TODO: We may also need "bold" and some hypertext colours.
if (code >= 0x40 && code <= 0x5e) // Start code
// Start codes are followed by a parameter count and a number of parameter bytes.
{
if (++i == m_Content.Size)
{
break;
}
char paramCount = m_Content.GetAt(i);
i++;
if (code == 0x43 && paramCount == 4 && i + paramCount <= m_Content.Size)
{
// Start of colour.
if (pCurrItem.Text.Size != 0)
{
pCurrItem = pCurrItem.NewItem(); pCurrLine.Items.Append(pCurrItem);
}
pCurrItem.Colour = new MHRgba(m_Content.GetAt(i), m_Content.GetAt(i + 1),
m_Content.GetAt(i + 2), 255 - m_Content.GetAt(i + 3));
// Push this colour onto the colour stack.
m_ColourStack.Push(pCurrItem.Colour);
}
else
{
Logging.Log(Logging.MHLogWarning, "Unknown text escape code " + code);
}
i += paramCount; // Skip the parameters
}
else if (code >= 0x60 && code <= 0x7e) // End code.
{
i++;
if (code == 0x63)
{
if (m_ColourStack.Count > 1)
{
m_ColourStack.Pop();
// Start a new item since we're using a new colour.
if (pCurrItem.Text.Size != 0)
{
pCurrItem = pCurrItem.NewItem();
pCurrLine.Items.Append(pCurrItem);
}
// Set the subsequent text in the colour we're using now.
pCurrItem.Colour = m_ColourStack.Peek();
}
}
}
}
else if (ch <= 0x1f)
{
// Certain characters including LF and the marker codes between 0x1c and 0x1f are
// explicitly intended to be ignored. Include all the other codes.
}
else // Add to the current text.
{
int nStart = i - 1;
while (i < m_Content.Size && m_Content.GetAt(i) >= 0x20)
{
i++;
}
pCurrItem.Text.Append(new MHOctetString(m_Content, nStart, i - nStart));
}
}
// Set up the initial attributes.
int style, size, lineSpace, letterSpace;
InterpretAttributes(m_fontAttrs, out style, out size, out lineSpace, out letterSpace);
// Create a font with this information.
m_pDisplay.SetFont(size, (style & 2) != 0, (style & 1) != 0);
// Calculate the layout of each section.
for (i = 0; i < theText.Size; i++)
{
MHTextLine pLine = theText.GetAt(i);
pLine.LineWidth = 0;
for (int j = 0; j < pLine.Items.Size; j++)
{
MHTextItem pItem = pLine.Items.GetAt(j);
// Set any tabs.
for (int k = 0; k < pItem.TabCount; k++)
{
pLine.LineWidth += TABSTOP - pLine.LineWidth % TABSTOP;
}
if (pItem.UnicodeLength == 0)
{ // Convert UTF-8 to Unicode.
int s = pItem.Text.Size;
pItem.Unicode = pItem.Text.ToString();
pItem.UnicodeLength = pItem.Unicode.Length;
}
// Fit the text onto the line.
int nFullText = pItem.UnicodeLength;
// Get the box size and update pItem.m_nUnicode to the number that will fit.
Rectangle rect = m_pDisplay.GetBounds(pItem.Unicode, ref nFullText, m_nBoxWidth - pLine.LineWidth);
if (nFullText == pItem.UnicodeLength || !m_fTextWrap)
{
// All the characters fit or we're not wrapping.
pItem.Width = rect.Width;
pLine.LineWidth += rect.Width;
}
/* else if (m_fTextWrap)
* { // No, we have to word-wrap.
* int nTruncated = pItem.UnicodeLength; // Just in case.
* // Now remove characters until we find a word-break character.
* while (pItem.UnicodeLength > 0 && pItem.Unicode[pItem.UnicodeLength] != ' ') pItem.UnicodeLength--;
* // If there are now word-break characters we truncate the text.
* if (pItem.UnicodeLength == 0) pItem.UnicodeLength = nTruncated;
* // Special case to avoid infinite loop if the box is very narrow.
* if (pItem.UnicodeLength == 0) pItem.UnicodeLength = 1;
*
* // We need to move the text we've cut off this line into a new line.
* int nNewWidth = nFullText - pItem.UnicodeLength;
* int nNewStart = pItem.UnicodeLength;
* // Remove any spaces at the start of the new section.
* while (nNewWidth != 0 && pItem.Unicode[nNewStart] == ' ') { nNewStart++; nNewWidth--; }
* if (nNewWidth != 0) {
* // Create a new line from the extra text.
* MHTextLine pNewLine = new MHTextLine();
* theText.InsertAt(pNewLine, i+1);
* // The first item on the new line is the rest of the text.
* MHTextItem pNewItem = pItem.NewItem();
* pNewLine.Items.Append(pNewItem);
* pNewItem.Unicode = pItem.Unicode.Substring(nNewStart, nNewWidth);
* pNewItem.UnicodeLength = nNewWidth;
* }
* // Remove any spaces at the end of the old section. If we don't do that and
* // we are centering or right aligning the text we'll get it wrong.
* while (pItem.UnicodeLength > 1 && pItem.Unicode[pItem.UnicodeLength - 1] == ' ') pItem.UnicodeLength--;
* int uniLength = pItem.UnicodeLength;
* rect = m_pDisplay.GetBounds(pItem.Unicode, ref uniLength, 0);
* pItem.Width = rect.Width;
* pLine.LineWidth += rect.Width;
* }
*/}
}
// Now output the text.
int yOffset = 0;
// If there isn't space for all the lines we should drop extra lines.
int nNumLines = theText.Size;
do
{
if (m_VertJ == End)
{
yOffset = m_nBoxHeight - nNumLines * lineSpace;
}
else if (m_VertJ == Centre)
{
yOffset = (m_nBoxHeight - nNumLines * lineSpace) / 2;
}
if (yOffset < 0)
{
nNumLines--;
}
} while (yOffset < 0);
for (i = 0; i < nNumLines; i++)
{
MHTextLine pLine = theText.GetAt(i);
int xOffset = 0;
if (m_HorizJ == End)
{
xOffset = m_nBoxWidth - pLine.LineWidth;
}
else if (m_HorizJ == Centre)
{
xOffset = (m_nBoxWidth - pLine.LineWidth) / 2;
}
//ASSERT(xOffset >= 0);
for (int j = 0; j < pLine.Items.Size; j++)
{
MHTextItem pItem = pLine.Items.GetAt(j);
// Tab across if necessary.
for (int k = 0; k < pItem.TabCount; k++)
{
xOffset += TABSTOP - xOffset % TABSTOP;
}
if (pItem.Unicode.Length != 0) // We may have blank lines.
{
m_pDisplay.AddText(xOffset, yOffset, // Jas removed this cos it doesn't make sense yOffset + lineSpace
pItem.Unicode.Substring(0, pItem.UnicodeLength), pItem.Colour);
}
xOffset += pItem.Width;
}
yOffset += lineSpace;
if (yOffset + lineSpace > m_nBoxHeight)
{
break;
}
}
}
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);
}
}