public StmtWord(string StmtText, StmtWord Parent, WordCursor WordCursor)
{
mStmtText = StmtText;
mSubWords = null;
mWordCursor = WordCursor;
this.Parent = Parent;
}
/// <summary>
/// construct this cursor as a copy of the input cursor.
/// </summary>
/// <param name="Cursor"></param>
public StmtWordListCursor(StmtWordListCursor Cursor)
{
this.mRltv = Cursor.mRltv;
this.mNode = Cursor.mNode;
this.mList = Cursor.mList;
this.mStayAtFlag = Cursor.mStayAtFlag;
this.mEdge = Cursor.mEdge;
}
public StmtWordListCursor(StmtWordList List)
{
mRltv = RelativePosition.Begin;
mNode = null;
mList = List;
mStayAtFlag = false;
mEdge = WhichEdge.None;
}
public StmtWordListCursor(
StmtWordList List, LinkedListNode <StmtWord> Node,
WhichEdge Edge, RelativePosition Rltv)
{
mList = List;
mRltv = Rltv;
mNode = Node;
mEdge = Edge;
mStayAtFlag = false;
}
public StmtWord(
string StmtText,
StmtWord Parent, WordCursor WordCursor, WordCompositeCode CompositeCode)
{
mStmtText = StmtText;
mSubWords = null;
mWordCursor = WordCursor;
mCompositeCode = CompositeCode;
this.Parent = Parent;
}
public StmtWordListCursor(
StmtWord Word, WhichEdge Edge, RelativePosition Rltv)
{
if (Word.IsTopWord == true)
{
mList = null;
mRltv = Rltv;
mNode = new LinkedListNode <StmtWord>(Word);
mEdge = Edge;
}
else
{
mList = Word.Parent.SubWords;
mRltv = Rltv;
mEdge = Edge;
mNode = Word.SubWordNode;
}
}
public StmtWordListCursor NextDeep()
{
StmtWordListCursor rv = null;
LinkedListNode <StmtWord> node;
WhichEdge edge = WhichEdge.None;
// stay at the current location.
if (StayAtFlag == true)
{
if (mRltv != RelativePosition.At)
{
throw new ApplicationException("cursor not position at location to stay at");
}
StayAtFlag = false;
rv = new StmtWordListCursor(mList, mNode, mEdge, mRltv);
node = mNode;
}
else
{
switch (mRltv)
{
case RelativePosition.Begin:
// at begin of top word.
if ((mNode != null) && (StmtWordList.IsTopWord(mNode) == true))
{
rv = new StmtWordListCursor(null, mNode, WhichEdge.LeadEdge, RelativePosition.At);
}
// stmt list is null.
else if (mList == null)
{
throw new ApplicationException("List of sub words is null");
}
else if (mList.Count == 0)
{
rv = new StmtWordListCursor(mList, null, WhichEdge.None, RelativePosition.End);
}
else
{
StmtWordListCursor c1 = new StmtWordListCursor(
mList, mList.First, WhichEdge.LeadEdge, RelativePosition.Before);
rv = c1.NextDeep();
}
break;
case RelativePosition.Before:
node = mNode;
if (StmtWordList.IsComposite(node))
{
edge = mEdge;
if (edge == WhichEdge.None)
{
edge = WhichEdge.LeadEdge;
}
}
else
{
edge = WhichEdge.None;
}
rv = new StmtWordListCursor(mList, mNode, edge, RelativePosition.At);
break;
case RelativePosition.At:
// step down a level and read the first sub word of this word.
if ((mEdge == WhichEdge.LeadEdge) && (mNode.Value.HasSubWords == true))
{
StmtWordListCursor c1 =
new StmtWordListCursor(
mNode.Value.SubWords, null, WhichEdge.None, RelativePosition.Begin);
rv = c1.NextDeep();
node = rv.Node;
}
// node has no child nodes. read the next sibling.
else if (mNode.Next != null)
{
rv = new StmtWordListCursor(
mList, mNode.Next, WhichEdge.LeadEdge, RelativePosition.At);
node = mNode.Next;
}
// read next from the parent of this node.
else
{
rv = NextDeepFromParent(mNode.Value);
node = rv.Node;
}
break;
case RelativePosition.After:
// Positioned after the lead edge of a composite word.
// Step down a level and read the first sub word of this word.
// ( the cursor will only be positioned like this if explicity set by user
// code. )
if ((mEdge == WhichEdge.LeadEdge) && (mNode.Value.HasSubWords == true))
{
StmtWordListCursor c1 =
new StmtWordListCursor(
mNode.Value.SubWords, null, WhichEdge.None, RelativePosition.Begin);
rv = c1.NextDeep();
node = rv.Node;
}
// read next sibling.
else if (mNode.Next != null)
{
node = mNode.Next;
rv = new StmtWordListCursor(
mList, mNode.Next, WhichEdge.LeadEdge, RelativePosition.At);
}
// read next from the parent of this node.
else
{
rv = NextDeepFromParent(mNode.Value);
node = rv.Node;
}
break;
case RelativePosition.End:
rv = new StmtWordListCursor(
null, null, WhichEdge.None, RelativePosition.End);
break;
default:
throw new ApplicationException("Next failed. Relative position is not set");
}
}
return(rv);
}
