--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/charconvfw/numbergrouping/Src/StateMachine.cpp	Tue Feb 02 02:02:46 2010 +0200
@@ -0,0 +1,214 @@
+/*
+* Copyright (c) 2002 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description: 
+*
+*/
+
+
+#include "StateMachine.h"
+
+// CStateMachine
+CStateMachine::CStateMachine(TInt aMaxNumberChars, TInt aMaxNumberStates) : iMaxNumberChars(static_cast<TInt>(aMaxNumberChars)),
+																			iMaxNumberStates(static_cast<TInt>(aMaxNumberStates))
+{
+}
+
+CStateMachine* CStateMachine::NewL(TInt aMaxNumberChars, TInt aMaxNumberStates)
+{
+	CStateMachine* s = NewLC(aMaxNumberChars, aMaxNumberStates);
+	CleanupStack::Pop();
+	return s;
+}
+
+CStateMachine* CStateMachine::NewLC(TInt aMaxNumberChars, TInt aMaxNumberStates)
+{
+	CStateMachine* s = new(ELeave)CStateMachine(aMaxNumberChars, aMaxNumberStates);
+	CleanupStack::PushL(s);
+	s->ConstructL();
+	return s;
+}
+
+CStateMachine::~CStateMachine()
+{
+	for(TInt i = 0; i < iMaxNumberChars; ++i)
+		delete iStateTable[i];
+	
+	delete iStateTable;
+}
+
+void CStateMachine::ConstructL()
+{
+	iStateTable = new TInt*[iMaxNumberChars];	
+
+	for(TInt i = 0; i < iMaxNumberChars; ++i)
+	{
+		iStateTable[i] = new TInt[iMaxNumberStates];
+		for(TInt j = 0; j < iMaxNumberStates; j++)
+			iStateTable[i][j] = 0;
+	}
+}
+
+void CStateMachine::AddStateTransistionL(TChar aChar, TInt aState, TInt aNextState)
+{
+	RArray<TInt> Dummy;
+	TInt CharIndex = MapIndex(aChar, Dummy);
+	Dummy.Close();
+	_LIT(KBufParsingError,"Parsing syntax error");
+	__ASSERT_ALWAYS( CharIndex >= 0 , User::Panic(KBufParsingError, KErrSyntaxError) );
+	AddStateTransistionL(CharIndex, aState, aNextState);
+}
+
+void CStateMachine::AddStateTransistionL(TInt aIndex, TInt aState, TInt aNextState)
+{
+	if(aIndex > iMaxNumberChars || aState > iMaxNumberStates || aNextState > iMaxNumberStates)
+		User::Leave(KErrGeneral);
+
+	iStateTable[static_cast<TInt>(aIndex)][static_cast<TInt>(aState)] = static_cast<TInt>(aNextState);
+}
+
+TBool CStateMachine::Matches(const TDesC& aString)
+{
+	// Walk the state table and return true if the string matches the pattern.
+	
+	TInt			nTableState = KStateNoMatch;
+	RArray<TInt>	arrIndices;
+	TBool			bFound = EFalse;
+
+	for(TInt nStringIndex = 0; nStringIndex < aString.Length(); ++nStringIndex)
+	{
+		arrIndices.Reset();
+		
+		TChar	charChar = aString[nStringIndex];
+		TInt	nTableIndex = MapIndex(charChar, arrIndices);
+
+		if(nTableIndex == -1) 
+			return EFalse;
+		
+		TInt nCount = arrIndices.Count();
+		
+		if(nCount)
+		{
+			for(TInt i = 0; i < nCount; i++)
+			{
+				nTableIndex = arrIndices[i];
+				TInt NewTableState = iStateTable[nTableIndex][nTableState];
+				
+				if( NewTableState != KStateNoMatch || 
+					(NewTableState == KStateNoMatch && i == (arrIndices.Count() - 1)) ||
+					NewTableState == KStateMatched)
+				{
+					nTableState = NewTableState;
+					break;
+				}
+			}
+		}
+		else
+		{
+			nTableState = iStateTable[nTableIndex][nTableState];
+		}
+
+		if(nTableState == KStateNoMatch)
+			break;
+
+		if(nTableState == KStateMatched)
+		{
+			bFound = ETrue;
+			break;
+		}
+	}
+
+	arrIndices.Close();
+	
+	return bFound;
+}
+
+TInt CStateMachine::MapIndex(TChar aChar, RArray<TInt>& aIndices)
+{
+    // Check the type of aChar and return the relevant index or indicies
+	if(aChar.IsDigit())
+	{
+		TInt nIndex = static_cast<TInt>(aChar.GetNumericValue());
+		
+		aIndices.Append(nIndex);
+		aIndices.Append(KCharacterDot);
+
+		return nIndex;
+	}
+
+	if(aChar == '+')	return KCharacterPlus;
+	if(aChar == '.')	return KCharacterDot;
+
+    return -1;  // TO DO : define 
+}
+
+void CStateMachine::GetWildcardVersionOfPattern( 
+    TText aWildcardChar, 
+    TDes& aWildcardedPattern ) const
+    {
+    aWildcardedPattern.SetLength(0);
+    TInt maxLength = aWildcardedPattern.MaxLength();
+    // There is a column in the StateTable for each character in the regular expression. The first character
+    // of the regexp in column [0], last in column [Length()-1]
+    // The non-zero values found within a column of the StateTable represent the characters
+    // that are valid at that position in a candidate match.
+    // An example pattern is calculated by examining the StateTable.
+    // For each column, count the number of matching ( i.e. not KStateNoMatch) states
+    // If only one, then place that character in the example pattern.
+    // If more than one, put the wildcard in.
+    for(TInt stateIndex = 0; stateIndex < iMaxNumberStates && stateIndex < maxLength; stateIndex++)
+        {
+        TInt matches = 0;
+        TInt matchedIndex = -1;
+        for (TInt charIndex = 0; charIndex < iMaxNumberChars; charIndex++ )
+            {
+            TInt nextState = iStateTable[charIndex][stateIndex];
+
+            if ( nextState != KStateNoMatch )
+                {
+                matches++;
+                matchedIndex = charIndex;
+                if (matches > 1 )
+                    break;
+                }
+            }
+        if ( matches == 0 ) // Have found an empty column.  Unused part of state machine. Stop filling
+            {
+            break;
+            }
+        else if ( matches > 1 )
+            aWildcardedPattern.Append(aWildcardChar);
+        else
+            {
+            if ( 0 <= matchedIndex && matchedIndex <= 9 ) // Must be a numeric digit
+                {
+                aWildcardedPattern.Append((TText)(matchedIndex+'0'));
+                }
+            else if ( matchedIndex == KCharacterDot )
+                {
+                aWildcardedPattern.Append(aWildcardChar);
+                }
+            else if ( matchedIndex == KCharacterPlus )
+                {
+                aWildcardedPattern.Append('+');
+                }
+            else
+                {
+                aWildcardedPattern.Append(aWildcardChar);
+                }
+            }
+        }
+
+    }
+// End of File
+