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// Copyright (c) 2013-2021 Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
//
// This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
using System;
using System.Collections.Generic;
using System.Text;
namespace Crow.Text
{
public struct TextChange
{
public readonly int Start;
public readonly int Length;
public string ChangedText;
public int End => Start + Length;
public int End2 => End + CharDiff;
public int CharDiff => string.IsNullOrEmpty (ChangedText) ? - Length : ChangedText.Length - Length;
public bool IsEmpty => string.IsNullOrEmpty (ChangedText) && Length == 0;
public bool HasNewText => !string.IsNullOrEmpty (ChangedText);
public bool HasNoEffect(ReadOnlySpan<char> src)
=> src.Slice(Start, Length).Equals(ChangedText, StringComparison.Ordinal);
public TextChange (int position, int length, string changedText = null) {
Start = position;
Length = length;
ChangedText = changedText;
}
public TextChange (int position, int length, ReadOnlySpan<char> changedText) {
Start = position;
Length = length;
ChangedText = changedText.ToString();
}
public TextChange Inverse (ReadOnlySpan<char> src)
=> new TextChange (Start, string.IsNullOrEmpty (ChangedText) ? 0 : ChangedText.Length,
Length == 0 ? "" : src.Slice (Start, Length).ToString ());
public override string ToString() => $"{Start},{ChangedText}";
}
}
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