454 lines
14 KiB
C#
454 lines
14 KiB
C#
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//#define debug
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.IO;
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namespace FastColoredTextBoxNS
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{
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/// <summary>
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/// This class contains the source text (chars and styles).
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/// It stores a text lines, the manager of commands, undo/redo stack, styles.
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/// </summary>
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public class FileTextSource : TextSource, IDisposable
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{
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List<int> sourceFileLinePositions = new List<int>();
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FileStream fs;
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Encoding fileEncoding;
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System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer();
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/// <summary>
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/// Occurs when need to display line in the textbox
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/// </summary>
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public event EventHandler<LineNeededEventArgs> LineNeeded;
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/// <summary>
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/// Occurs when need to save line in the file
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/// </summary>
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public event EventHandler<LinePushedEventArgs> LinePushed;
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public FileTextSource(FastColoredTextBox currentTB)
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: base(currentTB)
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{
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timer.Interval = 10000;
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timer.Tick += new EventHandler(timer_Tick);
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timer.Enabled = true;
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SaveEOL = Environment.NewLine;
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}
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void timer_Tick(object sender, EventArgs e)
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{
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timer.Enabled = false;
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try
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{
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UnloadUnusedLines();
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}
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finally
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{
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timer.Enabled = true;
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}
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}
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private void UnloadUnusedLines()
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{
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const int margin = 2000;
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var iStartVisibleLine = CurrentTB.VisibleRange.Start.iLine;
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var iFinishVisibleLine = CurrentTB.VisibleRange.End.iLine;
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int count = 0;
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for (int i = 0; i < Count; i++)
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if (base.lines[i] != null && !base.lines[i].IsChanged && Math.Abs(i - iFinishVisibleLine) > margin)
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{
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base.lines[i] = null;
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count++;
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}
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#if debug
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Console.WriteLine("UnloadUnusedLines: " + count);
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#endif
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}
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public void OpenFile(string fileName, Encoding enc)
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{
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Clear();
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if (fs != null)
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fs.Dispose();
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SaveEOL = Environment.NewLine;
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//read lines of file
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fs = new FileStream(fileName, FileMode.Open);
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var length = fs.Length;
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//read signature
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enc = DefineEncoding(enc, fs);
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int shift = DefineShift(enc);
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//first line
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sourceFileLinePositions.Add((int)fs.Position);
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base.lines.Add(null);
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//other lines
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sourceFileLinePositions.Capacity = (int)(length/7 + 1000);
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int prev = 0;
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while(fs.Position < length)
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{
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var b = fs.ReadByte();
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if (b == 10)// \n
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{
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sourceFileLinePositions.Add((int)(fs.Position) + shift);
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base.lines.Add(null);
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}else
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if (prev == 13)// \r (Mac format)
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{
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sourceFileLinePositions.Add((int)(fs.Position - 1) + shift);
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base.lines.Add(null);
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SaveEOL = "\r";
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}
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prev = b;
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}
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if (prev == 13)
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{
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sourceFileLinePositions.Add((int)(fs.Position) + shift);
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base.lines.Add(null);
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}
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if(length > 2000000)
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GC.Collect();
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Line[] temp = new Line[100];
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var c = base.lines.Count;
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base.lines.AddRange(temp);
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base.lines.TrimExcess();
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base.lines.RemoveRange(c, temp.Length);
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int[] temp2 = new int[100];
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c = base.lines.Count;
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sourceFileLinePositions.AddRange(temp2);
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sourceFileLinePositions.TrimExcess();
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sourceFileLinePositions.RemoveRange(c, temp.Length);
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fileEncoding = enc;
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OnLineInserted(0, Count);
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//load first lines for calc width of the text
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var linesCount = Math.Min(lines.Count, CurrentTB.ClientRectangle.Height/CurrentTB.CharHeight);
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for (int i = 0; i < linesCount; i++)
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LoadLineFromSourceFile(i);
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//
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NeedRecalc(new TextChangedEventArgs(0, linesCount - 1));
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if (CurrentTB.WordWrap)
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OnRecalcWordWrap(new TextChangedEventArgs(0, linesCount - 1));
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}
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private int DefineShift(Encoding enc)
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{
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if (enc.IsSingleByte)
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return 0;
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if (enc.HeaderName == "unicodeFFFE")
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return 0;//UTF16 BE
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if (enc.HeaderName == "utf-16")
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return 1;//UTF16 LE
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if (enc.HeaderName == "utf-32BE")
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return 0;//UTF32 BE
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if (enc.HeaderName == "utf-32")
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return 3;//UTF32 LE
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return 0;
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}
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private static Encoding DefineEncoding(Encoding enc, FileStream fs)
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{
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int bytesPerSignature = 0;
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byte[] signature = new byte[4];
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int c = fs.Read(signature, 0, 4);
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if (signature[0] == 0xFF && signature[1] == 0xFE && signature[2] == 0x00 && signature[3] == 0x00 && c >= 4)
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{
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enc = Encoding.UTF32;//UTF32 LE
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bytesPerSignature = 4;
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}
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else
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if (signature[0] == 0x00 && signature[1] == 0x00 && signature[2] == 0xFE && signature[3] == 0xFF)
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{
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enc = new UTF32Encoding(true, true);//UTF32 BE
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bytesPerSignature = 4;
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}
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else
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if (signature[0] == 0xEF && signature[1] == 0xBB && signature[2] == 0xBF)
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{
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enc = Encoding.UTF8;//UTF8
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bytesPerSignature = 3;
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}
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else
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if (signature[0] == 0xFE && signature[1] == 0xFF)
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{
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enc = Encoding.BigEndianUnicode;//UTF16 BE
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bytesPerSignature = 2;
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}
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else
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if (signature[0] == 0xFF && signature[1] == 0xFE)
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{
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enc = Encoding.Unicode;//UTF16 LE
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bytesPerSignature = 2;
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}
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fs.Seek(bytesPerSignature, SeekOrigin.Begin);
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return enc;
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}
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public void CloseFile()
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{
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if(fs!=null)
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try
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{
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fs.Dispose();
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}
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catch
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{
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;
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}
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fs = null;
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}
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/// <summary>
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/// End Of Line characters used for saving
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/// </summary>
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public string SaveEOL { get; set; }
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public override void SaveToFile(string fileName, Encoding enc)
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{
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//
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var newLinePos = new List<int>(Count);
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//create temp file
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var dir = Path.GetDirectoryName(fileName);
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var tempFileName = Path.Combine(dir, Path.GetFileNameWithoutExtension(fileName) + ".tmp");
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StreamReader sr = new StreamReader(fs, fileEncoding);
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using (FileStream tempFs = new FileStream(tempFileName, FileMode.Create))
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using (StreamWriter sw = new StreamWriter(tempFs, enc))
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{
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sw.Flush();
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for (int i = 0; i < Count; i++)
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{
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newLinePos.Add((int)tempFs.Length);
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var sourceLine = ReadLine(sr, i);//read line from source file
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string line;
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bool lineIsChanged = lines[i] != null && lines[i].IsChanged;
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if (lineIsChanged)
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line = lines[i].Text;
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else
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line = sourceLine;
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//call event handler
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if (LinePushed != null)
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{
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var args = new LinePushedEventArgs(sourceLine, i, lineIsChanged ? line : null);
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LinePushed(this, args);
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if(args.SavedText != null)
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line = args.SavedText;
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}
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//save line to file
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sw.Write(line);
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if (i < Count - 1)
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sw.Write(SaveEOL);
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sw.Flush();
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}
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}
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//clear lines buffer
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for (int i = 0; i < Count; i++)
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lines[i] = null;
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//deattach from source file
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sr.Dispose();
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fs.Dispose();
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//delete target file
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if (File.Exists(fileName))
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File.Delete(fileName);
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//rename temp file
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File.Move(tempFileName, fileName);
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//binding to new file
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sourceFileLinePositions = newLinePos;
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fs = new FileStream(fileName, FileMode.Open);
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this.fileEncoding = enc;
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}
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private string ReadLine(StreamReader sr, int i)
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{
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string line;
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var filePos = sourceFileLinePositions[i];
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if (filePos < 0)
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return "";
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fs.Seek(filePos, SeekOrigin.Begin);
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sr.DiscardBufferedData();
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line = sr.ReadLine();
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return line;
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}
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public override void ClearIsChanged()
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{
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foreach (var line in lines)
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if(line!=null)
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line.IsChanged = false;
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}
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public override Line this[int i]
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{
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get
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{
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if (base.lines[i] != null)
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return lines[i];
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else
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LoadLineFromSourceFile(i);
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return lines[i];
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}
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set
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{
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throw new NotImplementedException();
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}
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}
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private void LoadLineFromSourceFile(int i)
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{
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var line = CreateLine();
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fs.Seek(sourceFileLinePositions[i], SeekOrigin.Begin);
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StreamReader sr = new StreamReader(fs, fileEncoding);
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var s = sr.ReadLine();
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if (s == null)
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s = "";
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//call event handler
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if(LineNeeded!=null)
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{
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var args = new LineNeededEventArgs(s, i);
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LineNeeded(this, args);
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s = args.DisplayedLineText;
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if (s == null)
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return;
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}
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foreach (var c in s)
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line.Add(new Char(c));
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base.lines[i] = line;
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if (CurrentTB.WordWrap)
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OnRecalcWordWrap(new TextChangedEventArgs(i, i));
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}
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public override void InsertLine(int index, Line line)
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{
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sourceFileLinePositions.Insert(index, -1);
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base.InsertLine(index, line);
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}
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public override void RemoveLine(int index, int count)
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{
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sourceFileLinePositions.RemoveRange(index, count);
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base.RemoveLine(index, count);
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}
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public override void Clear()
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{
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base.Clear();
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}
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public override int GetLineLength(int i)
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{
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if (base.lines[i] == null)
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return 0;
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else
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return base.lines[i].Count;
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}
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public override bool LineHasFoldingStartMarker(int iLine)
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{
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if (lines[iLine] == null)
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return false;
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else
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return !string.IsNullOrEmpty(lines[iLine].FoldingStartMarker);
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}
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public override bool LineHasFoldingEndMarker(int iLine)
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{
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if (lines[iLine] == null)
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return false;
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else
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return !string.IsNullOrEmpty(lines[iLine].FoldingEndMarker);
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|
}
|
|||
|
|
|
|||
|
|
public override void Dispose()
|
|||
|
|
{
|
|||
|
|
if (fs != null)
|
|||
|
|
fs.Dispose();
|
|||
|
|
|
|||
|
|
timer.Dispose();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
internal void UnloadLine(int iLine)
|
|||
|
|
{
|
|||
|
|
if (lines[iLine] != null && !lines[iLine].IsChanged)
|
|||
|
|
lines[iLine] = null;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
public class LineNeededEventArgs : EventArgs
|
|||
|
|
{
|
|||
|
|
public string SourceLineText { get; private set; }
|
|||
|
|
public int DisplayedLineIndex { get; private set; }
|
|||
|
|
/// <summary>
|
|||
|
|
/// This text will be displayed in textbox
|
|||
|
|
/// </summary>
|
|||
|
|
public string DisplayedLineText { get; set; }
|
|||
|
|
|
|||
|
|
public LineNeededEventArgs(string sourceLineText, int displayedLineIndex)
|
|||
|
|
{
|
|||
|
|
this.SourceLineText = sourceLineText;
|
|||
|
|
this.DisplayedLineIndex = displayedLineIndex;
|
|||
|
|
this.DisplayedLineText = sourceLineText;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
public class LinePushedEventArgs : EventArgs
|
|||
|
|
{
|
|||
|
|
public string SourceLineText { get; private set; }
|
|||
|
|
public int DisplayedLineIndex { get; private set; }
|
|||
|
|
/// <summary>
|
|||
|
|
/// This property contains only changed text.
|
|||
|
|
/// If text of line is not changed, this property contains null.
|
|||
|
|
/// </summary>
|
|||
|
|
public string DisplayedLineText { get; private set; }
|
|||
|
|
/// <summary>
|
|||
|
|
/// This text will be saved in the file
|
|||
|
|
/// </summary>
|
|||
|
|
public string SavedText { get; set; }
|
|||
|
|
|
|||
|
|
public LinePushedEventArgs(string sourceLineText, int displayedLineIndex, string displayedLineText)
|
|||
|
|
{
|
|||
|
|
this.SourceLineText = sourceLineText;
|
|||
|
|
this.DisplayedLineIndex = displayedLineIndex;
|
|||
|
|
this.DisplayedLineText = displayedLineText;
|
|||
|
|
this.SavedText = displayedLineText;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|