/// <summary>
/// Calculate index of the next word.
/// </summary>
public static int Calc_NextWord(IViewInternal view)
{
int index;
Document doc = view.Document;
// if EOL code comes, return just after them
if (Utl.IsEol(doc, doc.CaretIndex))
{
return(Utl.SkipOneEol(doc, doc.CaretIndex));
}
// if the caret is at the end of document, return end of document
index = doc.CaretIndex + 1;
if (doc.Length <= index)
{
return(doc.Length);
}
// seek to next word starting position
index = doc.WordProc.NextWordStart(doc, index);
// skip trailling whitespace
if (Utl.IsWhiteSpace(doc, index))
{
index = doc.WordProc.NextWordStart(doc, index + 1);
}
return(index);
}
/// <summary>
/// Calculate index of the previous word.
/// </summary>
public static int Calc_PrevWord(IViewInternal view)
{
int index;
int startIndex;
Document doc = view.Document;
// if the caret is at the head of document, return head of document
index = doc.CaretIndex - 1;
if (index <= 0)
{
return(0);
}
// skip whitespace
startIndex = index;
if (Utl.IsWhiteSpace(doc, index))
{
index = doc.WordProc.PrevWordStart(doc, index) - 1;
if (index < 0)
{
return(0);
}
}
DebugUtl.Assert(0 <= index && index <= doc.Length);
// if EOL code comes, return just before them
if (Utl.IsEol(doc, index))
{
if (startIndex != index)
{
// do not skip this EOL code
// if this was detected after skipping whitespaces
return(index + 1);
}
else if (doc[index] == '\r')
{
return(index);
}
else
{
DebugUtl.Assert(doc[index] == '\n');
if (0 <= index - 1 && doc[index - 1] == '\r')
{
return(index - 1);
}
else
{
return(index);
}
}
}
// seek to previous word starting position
index = doc.WordProc.PrevWordStart(doc, index);
return(index);
}
