private void HandleBackspace(ObservableCollection <string> document, SubmissionRenderer renderer)
{
var start = renderer.CurrentChar;
if (start == 0)
{
if (renderer.CurrentLine == 0)
{
return;
}
var currentLine = document[renderer.CurrentLine];
var previousLine = document[renderer.CurrentLine - 1];
document.RemoveAt(renderer.CurrentLine);
renderer.CurrentLine--;
document[renderer.CurrentLine] = previousLine + currentLine;
renderer.CurrentChar = previousLine.Length;
}
else
{
var lineIndex = renderer.CurrentLine;
var line = document[lineIndex];
var before = line.Substring(0, start - 1);
var after = line.Substring(start);
document[lineIndex] = before + after;
renderer.CurrentChar--;
}
}
private void HandleRightArrow(ObservableCollection <string> document, SubmissionRenderer renderer)
{
if (renderer.CurrentChar < document[renderer.CurrentLine].Length)
{
renderer.CurrentChar++;
}
}
private void HandleLeftArrow(ObservableCollection <string> document, SubmissionRenderer renderer)
{
if (renderer.CurrentChar > 0)
{
renderer.CurrentChar--;
}
}
private void HandleEscape(ObservableCollection <string> document, SubmissionRenderer renderer)
{
document.Clear();
document.Add(string.Empty);
renderer.CurrentLine = 0;
renderer.CurrentChar = 0;
}
private void HandleTyping(ObservableCollection <string> document, SubmissionRenderer renderer, string text)
{
var lineIndex = renderer.CurrentLine;
var start = renderer.CurrentChar;
document[lineIndex] = document[lineIndex].Insert(start, text);
renderer.CurrentChar += text.Length;
}
private void HandlePageDown(ObservableCollection <string> document, SubmissionRenderer renderer)
{
submissionHistoryIndex++;
if (submissionHistoryIndex > submissionHistory.Count - 1)
{
submissionHistoryIndex = 0;
}
UpdateDocumentFromHistory(document, renderer);
}
private void HandlePageUp(ObservableCollection <string> document, SubmissionRenderer renderer)
{
submissionHistoryIndex--;
if (submissionHistoryIndex < 0)
{
submissionHistoryIndex = submissionHistory.Count - 1;
}
UpdateDocumentFromHistory(document, renderer);
}
private void HandleTab(ObservableCollection <string> document, SubmissionRenderer renderer)
{
const int TabWidth = 4;
var start = renderer.CurrentChar;
var remainingSpaces = TabWidth - start % TabWidth;
var line = document[renderer.CurrentLine];
document[renderer.CurrentLine] = line.Insert(start, new string(' ', remainingSpaces));
renderer.CurrentChar += remainingSpaces;
}
private void HandleDownArrow(ObservableCollection <string> document, SubmissionRenderer renderer)
{
if (renderer.CurrentLine < document.Count - 1)
{
renderer.CurrentLine++;
}
else
{
HandlePageDown(document, renderer);
}
}
private void HandleUpArrow(ObservableCollection <string> document, SubmissionRenderer renderer)
{
if (renderer.CurrentLine > 0)
{
renderer.CurrentLine--;
}
else
{
HandlePageUp(document, renderer);
}
}
private void HandleEnter(ObservableCollection <string> document, SubmissionRenderer renderer)
{
var submissionText = string.Join(Environment.NewLine, document);
if (IsSubmissionComplete(submissionText))
{
editDone = true;
return;
}
InsertLine(document, renderer);
}
private void InsertLine(ObservableCollection <string> document, SubmissionRenderer renderer)
{
var remainder = document[renderer.CurrentLine].Substring(renderer.CurrentChar);
document[renderer.CurrentLine] = document[renderer.CurrentLine].Substring(0, renderer.CurrentChar);
var lineIndex = renderer.CurrentLine + 1;
document.Insert(lineIndex, remainder);
renderer.CurrentChar = 0;
renderer.CurrentLine = lineIndex;
}
private string EditSubmission()
{
editDone = false;
var document = new ObservableCollection <string>()
{
""
};
var renderer = new SubmissionRenderer(this, document);
while (!editDone)
{
var key = Console.ReadKey(true);
HandleKey(key, document, renderer);
}
return(string.Join(Environment.NewLine, document));
}
private void HandleDelete(ObservableCollection <string> document, SubmissionRenderer renderer)
{
var lineIndex = renderer.CurrentLine;
var line = document[lineIndex];
var start = renderer.CurrentChar;
if (start >= line.Length)
{
if (renderer.CurrentLine == document.Count - 1)
{
return;
}
var nextLine = document[renderer.CurrentLine + 1];
document[renderer.CurrentLine] += nextLine;
document.RemoveAt(renderer.CurrentLine + 1);
return;
}
var before = line.Substring(0, start);
var after = line.Substring(start + 1);
document[lineIndex] = before + after;
}
private void HandleKey(ConsoleKeyInfo key, ObservableCollection <string> document, SubmissionRenderer renderer)
{
if (key.Modifiers == default(ConsoleModifiers))
{
switch (key.Key)
{
case ConsoleKey.Backspace:
HandleBackspace(document, renderer);
break;
case ConsoleKey.Tab:
HandleTab(document, renderer);
break;
case ConsoleKey.Enter:
HandleEnter(document, renderer);
break;
case ConsoleKey.Escape:
HandleEscape(document, renderer);
break;
case ConsoleKey.PageUp:
HandlePageUp(document, renderer);
break;
case ConsoleKey.PageDown:
HandlePageDown(document, renderer);
break;
case ConsoleKey.End:
HandleEnd(document, renderer);
break;
case ConsoleKey.Home:
HandleHome(document, renderer);
break;
case ConsoleKey.LeftArrow:
HandleLeftArrow(document, renderer);
break;
case ConsoleKey.UpArrow:
HandleUpArrow(document, renderer);
break;
case ConsoleKey.RightArrow:
HandleRightArrow(document, renderer);
break;
case ConsoleKey.DownArrow:
HandleDownArrow(document, renderer);
break;
case ConsoleKey.Delete:
HandleDelete(document, renderer);
break;
}
}
else if (key.Modifiers == ConsoleModifiers.Control)
{
switch (key.Key)
{
case ConsoleKey.Enter:
HandleCtrlEnter(document, renderer);
break;
}
}
if (key.Key != ConsoleKey.Backspace && key.KeyChar >= ' ')
{
HandleTyping(document, renderer, key.KeyChar.ToString());
}
}
private void UpdateDocumentFromHistory(ObservableCollection <string> document, SubmissionRenderer view)
{
if (submissionHistory.Count == 0)
{
return;
}
document.Clear();
Console.WriteLine(submissionHistoryIndex);
var historyItem = submissionHistory[submissionHistoryIndex];
var lines = historyItem.Split(Environment.NewLine);
foreach (var line in lines)
{
document.Add(line);
}
view.CurrentLine = document.Count - 1;
view.CurrentChar = document[view.CurrentLine].Length;
}
private void HandleCtrlEnter(ObservableCollection <string> document, SubmissionRenderer renderer)
{
InsertLine(document, renderer);
}
private void HandleHome(ObservableCollection <string> document, SubmissionRenderer renderer)
{
renderer.CurrentChar = 0;
}
private void HandleEnd(ObservableCollection <string> document, SubmissionRenderer renderer)
{
renderer.CurrentChar = document[renderer.CurrentLine].Length;
}