SpatialFear.SFTextParser

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//=============================================================================
// Spatial Fear
// Name: SFTextParser
// Description: Generic text parser
//
// Author: Markus Nuebel
//=============================================================================


class SFTextParser extends SFObject;

var String	m_strText;
var String	m_strDisplayText;
var int		m_nTextPos;
var int		m_nTextLength;
var actor	m_actOwner;


// Inits the parser
simulated function init(String strText)
{
	m_strText		= strText;
	m_nTextPos		= 0;
	m_nTextLength	= Len(m_strText);
}

// Cleanup
simulated function terminate()
{
}

// Advances to the end of the text and fills
// the display text with all of the input text
simulated function advanceToEnd()
{
	m_nTextPos			= m_nTextLength-1;
	m_strDisplayText	= Left(m_strText, m_nTextPos);
}

// Extracts the next char from the original text
simulated  function string peekChar()
{
	return (Mid(m_strText, m_nTextPos-1, 1));
}

// Checks, wheather there is currently a macro starting
simulated function bool isMacroStart()
{
	return (peekChar() == "<");
}

// Checks, wheather there is currently a macro ending
simulated function bool isMacroEnd()
{
	return (peekChar() == ">");
}

// Checks, wheather there is currently a macro parameter delimiter
simulated function bool isMacroParameter()
{
	return (peekChar() == ":");
}


// Macro function to clear the screen
simulated function executeCLS()
{
	m_strText		= Right(m_strText, Len(m_strText)-m_nTextPos);

	m_nTextLength	= Len(m_strText);
	m_nTextPos		= 0;
}

// Macro to play a sound effect
simulated function	executeSound(string strParameter)
{
	local Sound	sndEffect;
	sndEffect	= Sound(DynamicLoadObject(strParameter, class'Sound'));
	if(None == m_actOwner)
		PlaySound(sndEffect,SLOT_Talk);
	else
		m_actOwner.PlaySound(sndEffect,SLOT_Talk);
}


simulated function bool executeMacro(string strMacro, string strParameter, string strParameter2)
{
	// Check for known macros
	if(strMacro == "cls")
	{
		// Call clear screen macro
		executeCLS();
	}
	else
	if(strMacro == "sound")
	{
		executeSound(strParameter);
	}
	else
		class'SFUtils'.static.sfError( "SFTextParser - executeMacro: Unknown macro: " $ strMacro);

	return false;
}

// Checks the current character for a macro sequence
simulated function bool checkChar()
{
	local string	strMacro;
	local string	strParameter;
	local string	strParameter2;
	local string	strChar;
	local string	strLeft, strRight;
	local int		nMax;
	local int		nLeft, nRight;
	local bool		bRet;
	local bool		bInParameter1;
	local bool		bInParameter2;


	// Some inits
	bRet			= false;
	bInParameter1	= false;
	bInParameter2	= false;
	nMax			= Len(m_strText);

	// Check for macro start
	if(isMacroStart())
	{
		// Save pos to extract macro later
		nLeft = m_nTextPos-1;

		m_nTextPos++;
		while(!isMacroEnd() && (m_nTextPos<=nMax))
		{
			// Extract the macro and it's paramters
			if(!bInParameter1)
			{
				// Still reading macro tag
				if(!isMacroParameter())
					strMacro = strMacro $ peekChar();
				else
					bInParameter1 = true;
			}
			else
			{
				if(!bInParameter2)
				{
					// Still reading macro parameter1
					if(!isMacroParameter())
						// Already parsing the parameter
						strParameter	= strParameter $ peekChar();
					else
						bInParameter2 = true;
				}
				else
					strParameter2	= strParameter2 $ peekChar();

			}

			m_nTextPos++;
		}
		nRight = m_nTextPos-1;

		// class'SFUtils'.static.sfLogEx(15, SFTextParser - checkChar: "MACRO: " $ strMacro $ " Param: " $ strParameter $ " nLeft: " $ nLeft $ " nRight: " $ nRight $ " Size: " $ nRight-nLeft+1);

		// Extract left and right text part, next to the macro
		strLeft			= Left (m_strText, nLeft);
		strRight		= Right(m_strText, nMax-nRight-1);
		// Build up new text
		m_strText		= strLeft $ strRight;
		m_nTextLength	= Len(m_strText);
		m_nTextPos		= m_nTextPos-(nRight-nLeft+1);

		//class'sfUtils'.static.sfLogEx(5, "SFTextParser - checkChar: strText: " $ m_strText $ " length " $ m_nTextLength $ " pos " $ m_nTextPos);
		// Execute the macro
		//class'sfUtils'.static.sfLogEx(5, "SFTextParser - checkChar: macro: " $ strMacro $ " " $ strParameter $ " " $ strParameter2);
		executeMacro(strMacro, strParameter, strParameter2);
		
	}
	
	return bRet;
}

// Called every time to process a new char
simulated function bool process()
{
	local string strChar;
	local string strMacro;

	// Increment text pos
	m_nTextPos++;

	if(checkChar())
		return false;

	// Add one more character
	if(Mid(m_strText, m_nTextPos-1, 1) == "\\")
		m_strDisplayText = Left(m_strText, m_nTextPos-1);
	else
		m_strDisplayText = Left(m_strText, m_nTextPos);

	// Check, if there is a need for a new timer run
	if(m_nTextLength >= m_nTextPos)
		return false;
	else 
		return true;
}


// Fires a normal event
function FireEvent(name nameEvent, actor Other)
{
	local actor A;
	// Broadcast the Trigger message to all matching actors.
	if( nameEvent != '' )
		foreach AllActors( class 'Actor', A, nameEvent )
		{
			A.Trigger( Other, Pawn(Owner) );
		}
}

defaultproperties
{
}

class file time: 12/7/2003 3:58:24 PM - creation time: 12/7/2003 4:03:45 PM
Created with UnCodeX