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Copy pathTextObjects.Vi.cs
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Copy pathTextObjects.Vi.cs
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181 lines (155 loc) · 5.76 KB
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using System;
using System.Collections.Generic;
namespace Microsoft.PowerShell
{
public partial class PSConsoleReadLine
{
internal enum TextObjectOperation
{
None,
Change,
Delete,
}
internal enum TextObjectSpan
{
None,
Around,
Inner,
}
private TextObjectOperation _textObjectOperation = TextObjectOperation.None;
private TextObjectSpan _textObjectSpan = TextObjectSpan.None;
private readonly Dictionary<TextObjectOperation, Dictionary<TextObjectSpan, KeyHandler>> _textObjectHandlers = new()
{
[TextObjectOperation.Delete] = new() { [TextObjectSpan.Inner] = MakeKeyHandler(ViDeleteInnerWord, "ViDeleteInnerWord") },
};
private void ViChordDeleteTextObject(ConsoleKeyInfo? key = null, object arg = null)
{
_textObjectOperation = TextObjectOperation.Delete;
ViChordTextObject(key, arg);
}
private void ViChordTextObject(ConsoleKeyInfo? key = null, object arg = null)
{
if (!key.HasValue)
{
ResetTextObjectState();
throw new ArgumentNullException(nameof(key));
}
_textObjectSpan = GetRequestedTextObjectSpan(key.Value);
// Handle text object
var textObjectKey = ReadKey();
if (_viChordTextObjectsTable.TryGetValue(textObjectKey, out _))
{
_singleton.ProcessOneKey(textObjectKey, _viChordTextObjectsTable, ignoreIfNoAction: true, arg: arg);
}
else
{
ResetTextObjectState();
Ding();
}
}
private TextObjectSpan GetRequestedTextObjectSpan(ConsoleKeyInfo key)
{
if (key.KeyChar == 'i')
{
return TextObjectSpan.Inner;
}
else if (key.KeyChar == 'a')
{
return TextObjectSpan.Around;
}
else
{
System.Diagnostics.Debug.Assert(false);
throw new NotSupportedException();
}
}
private static void ViHandleTextObject(ConsoleKeyInfo? key = null, object arg = null)
{
if (!_singleton._textObjectHandlers.TryGetValue(_singleton._textObjectOperation, out var textObjectHandler) ||
!textObjectHandler.TryGetValue(_singleton._textObjectSpan, out var handler))
{
ResetTextObjectState();
Ding();
return;
}
handler.Action(key, arg);
}
private static void ResetTextObjectState()
{
_singleton._textObjectOperation = TextObjectOperation.None;
_singleton._textObjectSpan = TextObjectSpan.None;
}
private static void ViDeleteInnerWord(ConsoleKeyInfo? key = null, object arg = null)
{
var delimiters = _singleton.Options.WordDelimiters;
if (!TryGetArgAsInt(arg, out var numericArg, 1))
{
return;
}
if (_singleton._buffer.Length == 0)
{
if (numericArg > 1)
{
Ding();
}
return;
}
// Unless at the end of the buffer a single delete word should not delete backwards
// so if the cursor is on an empty line, do nothing.
if (numericArg == 1 &&
_singleton._current < _singleton._buffer.Length &&
_singleton._buffer.IsLogigalLineEmpty(_singleton._current))
{
return;
}
var start = _singleton._buffer.ViFindBeginningOfWordObjectBoundary(_singleton._current, delimiters);
var end = _singleton._current;
// Attempting to find a valid position for multiple words.
// If no valid position is found, this is a no-op
{
while (numericArg-- > 0 && end < _singleton._buffer.Length)
{
end = _singleton._buffer.ViFindBeginningOfNextWordObjectBoundary(end, delimiters);
}
// Attempting to delete too many words should ding.
if (numericArg > 0)
{
Ding();
return;
}
}
if (end > 0 && _singleton._buffer.IsAtEndOfBuffer(end - 1) && _singleton._buffer.InWord(end - 1, delimiters))
{
_singleton._shouldAppend = true;
}
_singleton.RemoveTextToViRegister(start, end - start);
_singleton.AdjustCursorPosition(start);
_singleton.Render();
}
/// <summary>
/// Attempt to set the cursor at the specified position.
/// </summary>
/// <param name="position"></param>
/// <returns></returns>
private int AdjustCursorPosition(int position)
{
// This method might prove useful in a more general case.
if (_buffer.Length == 0)
{
_current = 0;
return 0;
}
var maxPosition = _buffer[_buffer.Length - 1] == '\n'
? _buffer.Length
: _buffer.Length - 1;
var newCurrent = Math.Min(position, maxPosition);
var beginning = GetBeginningOfLinePos(newCurrent);
if (newCurrent < _buffer.Length && _buffer[newCurrent] == '\n' && (newCurrent + ViEndOfLineFactor > beginning))
{
newCurrent += ViEndOfLineFactor;
}
_current = newCurrent;
return newCurrent;
}
}
}