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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;
using System.Collections.Generic;
using System.Text;
namespace Crow.Text
{
public class LineCollection : IList<TextLine>
{
TextLine[] lines;
int length;
#region CTOR
public LineCollection (int capacity) {
lines = new TextLine[capacity];
length = 0;
}
public LineCollection (TextLine[] _lines, int capacity = -1) {
if (capacity >= _lines.Length) {
lines = new TextLine[capacity];
_lines.AsSpan ().CopyTo (lines);
} else
lines =_lines;
length = _lines.Length;
}
public LineCollection (string _text, int capacity = 4) : this (capacity) {
Update (_text.AsSpan ());
}
#endregion
public void Update (ReadOnlySpan<char> _text) {
length = 0;
int start = 0, i = 0;
while (i < _text.Length) {
char c = _text[i];
if (c == '\r') {
if (++i < _text.Length) {
if (_text[i] == '\n')
Add (new TextLine (start, i - 1, ++i));
else
Add (new TextLine (start, i - 1, i));
} else
Add (new TextLine (start, i - 1, i));
start = i;
} else if (c == '\n') {
if (++i < _text.Length) {
if (_text[i] == '\r')
Add (new TextLine (start, i - 1, ++i));
else
Add (new TextLine (start, i - 1, i));
} else
Add (new TextLine (start, i - 1, i));
start = i;
} else if (c == '\u0085' || c == '\u2028' || c == '\u2029')
Add (new TextLine (start, i - 1, i));
else
i++;
}
if (start < i)
Add (new TextLine (start, _text.Length, _text.Length));
else
Add (new TextLine (_text.Length, _text.Length, _text.Length));
}
public void Update (TextChange change) {
CharLocation locStart = GetLocation (change.Start);
int charsDiff = change.ChangedText.Length - change.Length;
int lineEnd = locStart.Line;
while (lineEnd < length - 1 && change.End >= lines[lineEnd + 1].Start)
lineEnd++;
int columnEnd = change.End - lines[lineEnd].Start;
int lineEndLineBreakLength = lines[lineEnd].LineBreakLength;
LineCollection newLines = new LineCollection (change.ChangedText);
int linesDiff = newLines.length - 1 - (lineEnd - locStart.Line);
TextLine endTl = lines[lineEnd];
if (linesDiff < 0)
RemoveAt (locStart.Line + 1, -linesDiff);
else if (linesDiff > 0) {
for (int i = 0; i < linesDiff; i++)
Insert (locStart.Line + 1, default);
}
int remainingColumns = endTl.Length - columnEnd;
lineEnd += linesDiff;
lines[lineEnd].SetLength (0);
lines[locStart.Line].SetLength (locStart.Column + newLines[0].Length);
lines[lineEnd].Length += remainingColumns;
if (newLines.Count > 1) {
lines[lineEnd].Length += newLines[newLines.Count - 1].Length;
lines[locStart.Line].LengthIncludingLineBreak = lines[locStart.Line].Length + newLines[0].LineBreakLength;
}
lines[lineEnd].LengthIncludingLineBreak = lines[lineEnd].Length + endTl.LineBreakLength;
for (int i = 1; i < newLines.Count - 1; i++) {
int l = locStart.Line + i;
lines[l] = newLines[i];
lines[l].Start = lines[l - 1].EndIncludingLineBreak;
}
if (lineEnd > 0)
lines[lineEnd].Start = lines[lineEnd - 1].EndIncludingLineBreak;
//shift start for remaining lines
for (int i = lineEnd + 1; i < length; i++)
lines[i].Start += charsDiff;
}
public int GetAbsolutePosition (CharLocation loc) => lines[loc.Line].Start + loc.Column;
public CharLocation GetLocation (int absolutePosition) {
TextLine tl = new TextLine (absolutePosition);
int result = lines.AsSpan (0, length).BinarySearch (tl);
if (result < 0) {
result = ~result;
return new CharLocation (result - 1, absolutePosition - lines[result - 1].Start);
}
return new CharLocation (result, absolutePosition - lines[result].Start);
}
[Obsolete]
public void UpdateLineLengthInPixel (int index, int lengthInPixel) {
lines[index].LengthInPixel = lengthInPixel;
}
public int Count => length;
public bool IsReadOnly => false;
public bool IsEmpty => length == 0;
public TextLine this[int index] { get => lines[index]; set => lines[index] = value; }
public void Add (TextLine item) {
if (lines.Length < length + 1) {
TextLine[] tmp = new TextLine[length * 2];
lines.AsSpan ().CopyTo (tmp);
lines = tmp;
}
lines[length] = item;
length++;
}
public void Clear () {
length = 0;
}
public bool Contains (TextLine item) => Array.IndexOf<TextLine> (lines, item) >= 0;
public void CopyTo (TextLine[] array, int arrayIndex) {
lines.AsSpan (0, length).CopyTo (array.AsSpan (arrayIndex));
}
public bool Remove (TextLine item) {
int idx = Array.IndexOf<TextLine> (lines, item);
if (idx < 0)
return false;
if (idx + 1 < length)
lines.AsSpan (idx + 1, length - idx - 1).CopyTo (lines.AsSpan (idx));
length--;
return true;
}
public IEnumerator<TextLine> GetEnumerator () => new Enumerator (this);
IEnumerator IEnumerable.GetEnumerator () => GetEnumerator ();
public int IndexOf (TextLine item) => Array.IndexOf (lines, item);
public void Insert (int index, TextLine item) {
if (lines.Length < length + 1) {
TextLine[] tmp = new TextLine[length * 2];
lines.AsSpan (0, index).CopyTo (tmp);
lines.AsSpan (index).CopyTo (tmp.AsSpan (index + 1));
lines = tmp;
}else
lines.AsSpan (index, length - index).CopyTo (lines.AsSpan (index + 1));
lines[index] = item;
length++;
}
public void RemoveAt (int index) {
if (index + 1 < length)
lines.AsSpan (index + 1, length - index - 1).CopyTo (lines.AsSpan (index));
length--;
}
public void RemoveAt (int index, int count) {
if (index + count < length)
lines.AsSpan (index + count, length - index - count).CopyTo (lines.AsSpan (index));
length -= count;
}
public class Enumerator : IEnumerator<TextLine>
{
TextLine[] lines;
int length, position = -1;
public Enumerator (LineCollection coll) {
lines = coll.lines;
length = coll.length;
}
public TextLine Current => lines[position];
object IEnumerator.Current => Current;
public void Dispose () { }
public bool MoveNext () => ++position < length;
public void Reset () {
position = -1;
}
}
}
}
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