private void OpAdd(int i, int j, int cost)
{
#if DEBUG
Trace.WriteIf(XmlDiff.T_ForestDistance.Enabled, "-");
#endif
EditScriptAddOpened openedAdd = _forestDist[i, j - 1]._editScript as EditScriptAddOpened;
if (openedAdd == null)
{
openedAdd = new EditScriptAddOpened(j, _forestDist[i, j - 1]._editScript.GetClosedScript(i, j - 1));
}
_forestDist[i, j]._editScript = openedAdd;
_forestDist[i, j]._cost = cost;
}
private void OpAdd( int i, int j, int cost )
{
#if DEBUG
Trace.WriteIf( XmlDiff.T_ForestDistance.Enabled, "-" );
#endif
EditScriptAddOpened openedAdd = _forestDist[ i, j-1 ]._editScript as EditScriptAddOpened;
if ( openedAdd == null )
openedAdd = new EditScriptAddOpened( j, _forestDist[ i, j-1 ]._editScript.GetClosedScript( i, j-1 ) );
_forestDist[ i, j ]._editScript = openedAdd;
_forestDist[ i, j ]._cost = cost;
}
private void ComputeTreeDistance(int sourcePos, int targetPos)
{
int sourcePosLeft = _sourceNodes[sourcePos].Left;
int targetPosLeft = _targetNodes[targetPos].Left;
int i, j;
// init borders of _forestDist array
EditScriptAddOpened esAdd = new EditScriptAddOpened(targetPosLeft, EmptyEditScript);
EditScriptRemoveOpened esRemove = new EditScriptRemoveOpened(sourcePosLeft, EmptyEditScript);
_forestDist[sourcePosLeft - 1, targetPosLeft - 1]._cost = 0;
_forestDist[sourcePosLeft - 1, targetPosLeft - 1]._editScript = EmptyEditScript;
for (i = sourcePosLeft; i <= sourcePos; i++)
{
_forestDist[i, targetPosLeft - 1]._cost = (i - sourcePosLeft + 1) * OperationCost[(int)XmlDiffOperation.Remove];
_forestDist[i, targetPosLeft - 1]._editScript = esRemove;
}
for (j = targetPosLeft; j <= targetPos; j++)
{
_forestDist[sourcePosLeft - 1, j]._cost = (j - targetPosLeft + 1) * OperationCost[(int)XmlDiffOperation.Add];
_forestDist[sourcePosLeft - 1, j]._editScript = esAdd;
}
#if DEBUG
Trace.WriteIf(XmlDiff.T_ForestDistance.Enabled, "\nForest distance (" + sourcePos + "," + targetPos + "):\n");
Trace.WriteIf(XmlDiff.T_ForestDistance.Enabled, " 0 ");
for (j = targetPosLeft; j <= targetPos; j++)
{
Trace.WriteIf(XmlDiff.T_ForestDistance.Enabled, j + " ");
}
Trace.WriteIf(XmlDiff.T_ForestDistance.Enabled, "\n ");
for (j = targetPosLeft - 1; j <= targetPos; j++)
{
Trace.WriteIf(XmlDiff.T_ForestDistance.Enabled, "*****");
}
Trace.WriteIf(XmlDiff.T_ForestDistance.Enabled, "\n0 * 0 ");
for (j = targetPosLeft; j <= targetPos; j++)
{
Trace.WriteIf(XmlDiff.T_ForestDistance.Enabled, "-" + _forestDist[sourcePosLeft - 1, j]._cost + " ");
}
Trace.WriteIf(XmlDiff.T_ForestDistance.Enabled, "\n");
#endif
// compute the inside of _forestDist array
for (i = sourcePosLeft; i <= sourcePos; i++)
{
#if DEBUG
Trace.WriteIf(XmlDiff.T_ForestDistance.Enabled, i + " * |" + _forestDist[i, targetPosLeft - 1]._cost + " ");
#endif
for (j = targetPosLeft; j <= targetPos; j++)
{
int sourceCurLeft = _sourceNodes[i].Left;
int targetCurLeft = _targetNodes[j].Left;
int removeCost = _forestDist[i - 1, j]._cost + OperationCost[(int)XmlDiffOperation.Remove];
int addCost = _forestDist[i, j - 1]._cost + OperationCost[(int)XmlDiffOperation.Add];
if (sourceCurLeft == sourcePosLeft && targetCurLeft == targetPosLeft)
{
XmlDiffOperation changeOp = _sourceNodes[i].GetDiffOperation(_targetNodes[j], _xmlDiff);
Debug.Assert(XmlDiff.IsChangeOperation(changeOp) ||
changeOp == XmlDiffOperation.Match ||
changeOp == XmlDiffOperation.Undefined);
if (changeOp == XmlDiffOperation.Match)
{
// identical nodes matched
OpNodesMatch(i, j);
}
else
{
int changeCost = _forestDist[i - 1, j - 1]._cost + OperationCost[(int)changeOp];
if (changeCost < addCost)
{
// operation 'change'
if (changeCost < removeCost)
{
OpChange(i, j, changeOp, changeCost);
}
// operation 'remove'
else
{
OpRemove(i, j, removeCost);
}
}
else
{
// operation 'add'
if (addCost < removeCost)
{
OpAdd(i, j, addCost);
}
// operation 'remove'
else
{
OpRemove(i, j, removeCost);
}
}
}
_treeDist[i, j]._cost = _forestDist[i, j]._cost;
_treeDist[i, j]._editScript = _forestDist[i, j]._editScript.GetClosedScript(i, j);;
}
else
{
int m = sourceCurLeft - 1;
int n = targetCurLeft - 1;
if (m < sourcePosLeft - 1)
{
m = sourcePosLeft - 1;
}
if (n < targetPosLeft - 1)
{
n = targetPosLeft - 1;
}
// cost of concatenating of the two edit scripts
int compoundEditCost = _forestDist[m, n]._cost + _treeDist[i, j]._cost;
if (compoundEditCost < addCost)
{
if (compoundEditCost < removeCost)
{
// copy script
if (_treeDist[i, j]._editScript == EmptyEditScript)
{
Debug.Assert(_treeDist[i, j]._cost == 0);
OpCopyScript(i, j, m, n);
}
// concatenate scripts
else
{
OpConcatScripts(i, j, m, n);
}
}
// operation 'remove'
else
{
OpRemove(i, j, removeCost);
}
}
else
{
// operation 'add'
if (addCost < removeCost)
{
OpAdd(i, j, addCost);
}
// operation 'remove'
else
{
OpRemove(i, j, removeCost);
}
}
}
#if DEBUG
Trace.WriteIf(XmlDiff.T_ForestDistance.Enabled, _forestDist[i, j]._cost + " ");
#endif
}
#if DEBUG
Trace.WriteIf(XmlDiff.T_ForestDistance.Enabled, "\n");
#endif
}
}
private void ComputeTreeDistance( int sourcePos, int targetPos )
{
int sourcePosLeft = _sourceNodes[ sourcePos ].Left;
int targetPosLeft = _targetNodes[ targetPos ].Left;
int i, j;
// init borders of _forestDist array
EditScriptAddOpened esAdd = new EditScriptAddOpened( targetPosLeft, EmptyEditScript );
EditScriptRemoveOpened esRemove = new EditScriptRemoveOpened( sourcePosLeft, EmptyEditScript );
_forestDist[ sourcePosLeft-1, targetPosLeft-1 ]._cost = 0;
_forestDist[ sourcePosLeft-1, targetPosLeft-1 ]._editScript = EmptyEditScript;
for ( i = sourcePosLeft; i <= sourcePos; i++ )
{
_forestDist[ i, targetPosLeft-1 ]._cost = ( i - sourcePosLeft + 1 ) * OperationCost[ (int)XmlDiffOperation.Remove ];
_forestDist[ i, targetPosLeft-1 ]._editScript = esRemove;
}
for ( j = targetPosLeft; j <= targetPos; j++ )
{
_forestDist[ sourcePosLeft-1, j ]._cost = ( j - targetPosLeft + 1 ) * OperationCost[ (int)XmlDiffOperation.Add ];
_forestDist[ sourcePosLeft-1, j ]._editScript = esAdd;
}
#if DEBUG
Trace.WriteIf( XmlDiff.T_ForestDistance.Enabled, "\nForest distance (" + sourcePos + "," + targetPos + "):\n" );
Trace.WriteIf( XmlDiff.T_ForestDistance.Enabled, " 0 " );
for ( j = targetPosLeft; j <= targetPos; j++ )
Trace.WriteIf( XmlDiff.T_ForestDistance.Enabled, j + " " );
Trace.WriteIf( XmlDiff.T_ForestDistance.Enabled, "\n " );
for ( j = targetPosLeft-1; j <= targetPos; j++ )
Trace.WriteIf( XmlDiff.T_ForestDistance.Enabled, "*****" );
Trace.WriteIf( XmlDiff.T_ForestDistance.Enabled, "\n0 * 0 " );
for ( j = targetPosLeft; j <= targetPos; j++ )
Trace.WriteIf( XmlDiff.T_ForestDistance.Enabled, "-" + _forestDist[ sourcePosLeft-1, j ]._cost + " " );
Trace.WriteIf( XmlDiff.T_ForestDistance.Enabled, "\n" );
#endif
// compute the inside of _forestDist array
for ( i = sourcePosLeft; i <= sourcePos; i++ )
{
#if DEBUG
Trace.WriteIf( XmlDiff.T_ForestDistance.Enabled, i + " * |" + _forestDist[ i, targetPosLeft-1 ]._cost + " " );
#endif
for ( j = targetPosLeft; j <= targetPos; j++ )
{
int sourceCurLeft = _sourceNodes[i].Left;
int targetCurLeft = _targetNodes[j].Left;
int removeCost = _forestDist[ i-1, j ]._cost + OperationCost[ (int)XmlDiffOperation.Remove ];
int addCost = _forestDist[ i, j-1 ]._cost + OperationCost[ (int)XmlDiffOperation.Add ];
if ( sourceCurLeft == sourcePosLeft && targetCurLeft == targetPosLeft )
{
XmlDiffOperation changeOp = _sourceNodes[i].GetDiffOperation( _targetNodes[j], _xmlDiff );
Debug.Assert( XmlDiff.IsChangeOperation( changeOp ) ||
changeOp == XmlDiffOperation.Match ||
changeOp == XmlDiffOperation.Undefined );
if ( changeOp == XmlDiffOperation.Match )
{
// identical nodes matched
OpNodesMatch( i, j );
}
else
{
int changeCost = _forestDist[ i-1, j-1 ]._cost + OperationCost[ (int)changeOp ];
if ( changeCost < addCost )
{
// operation 'change'
if ( changeCost < removeCost )
OpChange( i, j, changeOp, changeCost );
// operation 'remove'
else
OpRemove( i, j, removeCost );
}
else
{
// operation 'add'
if ( addCost < removeCost )
OpAdd( i, j, addCost );
// operation 'remove'
else
OpRemove( i, j, removeCost );
}
}
_treeDist[ i, j ]._cost = _forestDist[ i, j ]._cost;
_treeDist[ i, j ]._editScript = _forestDist[ i, j ]._editScript.GetClosedScript( i, j );;
}
else
{
int m = sourceCurLeft - 1;
int n = targetCurLeft - 1;
if ( m < sourcePosLeft - 1 ) m = sourcePosLeft - 1;
if ( n < targetPosLeft - 1 ) n = targetPosLeft - 1;
// cost of concatenating of the two edit scripts
int compoundEditCost = _forestDist[ m, n ]._cost + _treeDist[ i, j ]._cost;
if ( compoundEditCost < addCost )
{
if ( compoundEditCost < removeCost )
{
// copy script
if ( _treeDist[ i, j ]._editScript == EmptyEditScript )
{
Debug.Assert( _treeDist[ i, j ]._cost == 0 );
OpCopyScript( i, j, m, n );
}
// concatenate scripts
else
OpConcatScripts( i, j, m, n );
}
// operation 'remove'
else
OpRemove( i, j, removeCost );
}
else
{
// operation 'add'
if ( addCost < removeCost)
OpAdd( i, j, addCost );
// operation 'remove'
else
OpRemove( i, j, removeCost );
}
}
#if DEBUG
Trace.WriteIf( XmlDiff.T_ForestDistance.Enabled, _forestDist[ i, j ]._cost + " " );
#endif
}
#if DEBUG
Trace.WriteIf( XmlDiff.T_ForestDistance.Enabled, "\n" );
#endif
}
}
