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Separate CsvIndexer from CsvParser.

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This commit is contained in:
Valeriano A.R.
2017-02-07 07:22:26 +01:00
parent 90cb3d16bd
commit 1d2d2ede22
5 changed files with 211 additions and 194 deletions
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165
CsvIndexer.cs Normal file
View File

@@ -0,0 +1,165 @@
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
namespace CsvView
{
public class CsvIndexer
{
private bool _insideString = false;
private char _separator = ',';
private char _quoteChar = '"';
private char _escapeChar = '\\';
public CsvIndexer(char separator = ',', char quoteChar = '"', char escapeChar = '\\')
{
_separator = separator;
_quoteChar = quoteChar;
_escapeChar = escapeChar;
}
private List<long> _index = new List<long>();
public List<long> Index { get { return _index; } }
private void DummyParser(string line)
{
for (int i = 0; i < line.Length; i++)
{
char c = line[i];
if (c == _separator && _insideString == false)
{
continue;
}
if (c == _quoteChar && _insideString == false)
{
_insideString = true;
continue;
}
if (c == _quoteChar && _insideString == true)
{
_insideString = false;
continue;
}
if (c == _escapeChar && _insideString)
{
i++;
c = line[i];
}
}
}
private class TrackingTextReader : TextReader
{
private TextReader _baseReader;
private int _position;
public TrackingTextReader(TextReader baseReader)
{
_baseReader = baseReader;
}
public override int Read()
{
_position++;
return _baseReader.Read();
}
public override int Peek()
{
return _baseReader.Peek();
}
public int Position
{
get { return _position; }
}
}
public void GenerateIndex(string file)
{
_insideString = false;
_index.Clear();
FileStream stream = new FileStream(file, FileMode.Open);
using (StreamReader streamReader = new StreamReader(stream, Encoding.Default, true, 4096))
using (TrackingTextReader reader = new TrackingTextReader(streamReader))
{
string currentLine;
if (_insideString == false)
{
_index.Add(reader.Position);
}
while ((currentLine = reader.ReadLine()) != null)
{
DummyParser(currentLine);
if (_insideString == false)
{
_index.Add(reader.Position);
}
}
}
stream.Close();
}
private void Index_SaveFile(string indexFile)
{
if (File.Exists(indexFile))
{
File.Delete(indexFile);
}
Stream streamOut = File.Open(indexFile, FileMode.Create);
using (BinaryWriter binWriter = new BinaryWriter(streamOut))
{
binWriter.Write(_index.Count);
for (int i = 0; i < _index.Count; i++)
{
binWriter.Write(_index[i]);
}
}
streamOut.Close();
}
private static List<long> Index_LoadFile(string indexFile)
{
var tempIndex = new List<long>();
Stream streamIn = File.Open(indexFile, FileMode.Open);
using (BinaryReader binReader = new BinaryReader(streamIn))
{
int numRegs = binReader.ReadInt32();
for (int i = 0; i < numRegs; i++)
{
long value = binReader.ReadInt64();
tempIndex.Add(value);
}
}
streamIn.Close();
return tempIndex;
}
public void LoadIndexOfFile(string file)
{
DateTime dtFile = File.GetCreationTime(file);
string indexFile = file + ".idx";
if (File.Exists(indexFile) && File.GetCreationTime(indexFile) > dtFile)
{
_index = Index_LoadFile(indexFile);
}
else
{
// Generate index
DateTime dtNow = DateTime.UtcNow;
GenerateIndex(file);
TimeSpan tsGenIndex = DateTime.UtcNow - dtNow;
// Save Index if expensive generation
if (tsGenIndex.TotalSeconds > 2)
{
Index_SaveFile(indexFile);
}
}
}
}
}

95
CsvParser.cs
View File

@@ -23,7 +23,7 @@ namespace CsvView
private List<string> _currentReg = null;
StringBuilder _currentCell = null;
public List<List<string>> Data
{
get { return _data; }
@@ -31,15 +31,15 @@ namespace CsvView
public void ParseLine(string line)
{
if(_currentReg == null)
if (_currentReg == null)
{
_currentReg = new List<string>();
}
if(_currentCell == null)
if (_currentCell == null)
{
_currentCell = new StringBuilder();
}
for (int i = 0; i < line.Length; i++)
{
char c = line[i];
@@ -96,7 +96,7 @@ namespace CsvView
while ((currentLine = reader.ReadLine()) != null)
{
ParseLine(currentLine);
if(count>0 && Data.Count== count)
if (count > 0 && Data.Count == count)
{
break;
}
@@ -104,89 +104,6 @@ namespace CsvView
}
stream.Close();
}
private List<long> _index = new List<long>();
public List<long> Index { get { return _index; } }
private void DummyParser(string line)
{
for (int i = 0; i < line.Length; i++)
{
char c = line[i];
if (c == _separator && _insideString == false)
{
continue;
}
if (c == _quoteChar && _insideString == false)
{
_insideString = true;
continue;
}
if (c == _quoteChar && _insideString == true)
{
_insideString = false;
continue;
}
if (c == _escapeChar && _insideString)
{
i++;
c = line[i];
}
}
}
private class TrackingTextReader : TextReader
{
private TextReader _baseReader;
private int _position;
public TrackingTextReader(TextReader baseReader)
{
_baseReader = baseReader;
}
public override int Read()
{
_position++;
return _baseReader.Read();
}
public override int Peek()
{
return _baseReader.Peek();
}
public int Position
{
get { return _position; }
}
}
public void GenerateIndex(string file)
{
_insideString = false;
_index.Clear();
FileStream stream = new FileStream(file, FileMode.Open);
using (StreamReader streamReader = new StreamReader(stream, Encoding.Default, true, 4096))
using (TrackingTextReader reader = new TrackingTextReader(streamReader))
{
string currentLine;
if (_insideString == false)
{
_index.Add(reader.Position);
}
while ((currentLine = reader.ReadLine()) != null)
{
DummyParser(currentLine);
if (_insideString == false)
{
_index.Add(reader.Position);
}
}
}
stream.Close();
}
}
}

1
CsvView.csproj
View File

@@ -64,6 +64,7 @@
<Reference Include="System.Xml" />
</ItemGroup>
<ItemGroup>
<Compile Include="CsvIndexer.cs" />
<Compile Include="CsvParser.cs" />
<Compile Include="CTextBox.cs">
<SubType>Component</SubType>

69
FrmCsvViewer.Designer.cs generated
View File

@@ -51,20 +51,18 @@
//
this.txtPath.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.txtPath.Location = new System.Drawing.Point(7, 27);
this.txtPath.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5);
this.txtPath.Location = new System.Drawing.Point(5, 18);
this.txtPath.Name = "txtPath";
this.txtPath.Size = new System.Drawing.Size(676, 26);
this.txtPath.Size = new System.Drawing.Size(452, 20);
this.txtPath.TabIndex = 0;
this.txtPath.DoubleClick += new System.EventHandler(this.txtPath_DoubleClick);
//
// btnLoad
//
this.btnLoad.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
this.btnLoad.Location = new System.Drawing.Point(691, 27);
this.btnLoad.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5);
this.btnLoad.Location = new System.Drawing.Point(461, 18);
this.btnLoad.Name = "btnLoad";
this.btnLoad.Size = new System.Drawing.Size(68, 26);
this.btnLoad.Size = new System.Drawing.Size(45, 20);
this.btnLoad.TabIndex = 3;
this.btnLoad.Text = "Load";
this.btnLoad.UseVisualStyleBackColor = true;
@@ -76,9 +74,11 @@
| System.Windows.Forms.AnchorStyles.Right)));
this.grpFile.Controls.Add(this.btnLoad);
this.grpFile.Controls.Add(this.txtPath);
this.grpFile.Location = new System.Drawing.Point(20, 12);
this.grpFile.Location = new System.Drawing.Point(13, 8);
this.grpFile.Margin = new System.Windows.Forms.Padding(2, 2, 2, 2);
this.grpFile.Name = "grpFile";
this.grpFile.Size = new System.Drawing.Size(766, 67);
this.grpFile.Padding = new System.Windows.Forms.Padding(2, 2, 2, 2);
this.grpFile.Size = new System.Drawing.Size(511, 44);
this.grpFile.TabIndex = 12;
this.grpFile.TabStop = false;
this.grpFile.Text = "File";
@@ -91,9 +91,10 @@
this.pnlScrollData.AutoScroll = true;
this.pnlScrollData.Controls.Add(this.pnlData);
this.pnlScrollData.DisableAutoScroll = true;
this.pnlScrollData.Location = new System.Drawing.Point(20, 126);
this.pnlScrollData.Location = new System.Drawing.Point(13, 85);
this.pnlScrollData.Margin = new System.Windows.Forms.Padding(2);
this.pnlScrollData.Name = "pnlScrollData";
this.pnlScrollData.Size = new System.Drawing.Size(766, 664);
this.pnlScrollData.Size = new System.Drawing.Size(511, 429);
this.pnlScrollData.TabIndex = 12;
//
// pnlData
@@ -102,10 +103,9 @@
| System.Windows.Forms.AnchorStyles.Right)));
this.pnlData.BackColor = System.Drawing.SystemColors.Control;
this.pnlData.DisableAutoScroll = true;
this.pnlData.Location = new System.Drawing.Point(0, 0);
this.pnlData.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5);
this.pnlData.Location = new System.Drawing.Point(0, 1);
this.pnlData.Name = "pnlData";
this.pnlData.Size = new System.Drawing.Size(766, 80);
this.pnlData.Size = new System.Drawing.Size(511, 51);
this.pnlData.TabIndex = 11;
//
// pnlReg
@@ -120,19 +120,17 @@
this.pnlReg.Controls.Add(this.btnLastReg);
this.pnlReg.Controls.Add(this.btnNextReg);
this.pnlReg.Enabled = false;
this.pnlReg.Location = new System.Drawing.Point(21, 87);
this.pnlReg.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5);
this.pnlReg.Location = new System.Drawing.Point(14, 57);
this.pnlReg.Name = "pnlReg";
this.pnlReg.Size = new System.Drawing.Size(765, 701);
this.pnlReg.Size = new System.Drawing.Size(510, 456);
this.pnlReg.TabIndex = 11;
//
// btnPrevReg
//
this.btnPrevReg.Font = new System.Drawing.Font("Courier New", 9.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.btnPrevReg.Location = new System.Drawing.Point(62, 0);
this.btnPrevReg.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5);
this.btnPrevReg.Location = new System.Drawing.Point(41, 0);
this.btnPrevReg.Name = "btnPrevReg";
this.btnPrevReg.Size = new System.Drawing.Size(54, 31);
this.btnPrevReg.Size = new System.Drawing.Size(36, 23);
this.btnPrevReg.TabIndex = 5;
this.btnPrevReg.Text = "<";
this.btnPrevReg.UseVisualStyleBackColor = true;
@@ -147,22 +145,20 @@
this.tblRegNumbers.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 50F));
this.tblRegNumbers.Controls.Add(this.txtCurrentReg, 0, 0);
this.tblRegNumbers.Controls.Add(this.txtTotalRegs, 1, 0);
this.tblRegNumbers.Location = new System.Drawing.Point(124, 0);
this.tblRegNumbers.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5);
this.tblRegNumbers.Location = new System.Drawing.Point(83, 0);
this.tblRegNumbers.Name = "tblRegNumbers";
this.tblRegNumbers.RowCount = 1;
this.tblRegNumbers.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 50F));
this.tblRegNumbers.Size = new System.Drawing.Size(517, 31);
this.tblRegNumbers.Size = new System.Drawing.Size(345, 28);
this.tblRegNumbers.TabIndex = 10;
//
// txtCurrentReg
//
this.txtCurrentReg.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.txtCurrentReg.Location = new System.Drawing.Point(4, 5);
this.txtCurrentReg.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5);
this.txtCurrentReg.Location = new System.Drawing.Point(3, 3);
this.txtCurrentReg.Name = "txtCurrentReg";
this.txtCurrentReg.Size = new System.Drawing.Size(250, 26);
this.txtCurrentReg.Size = new System.Drawing.Size(166, 20);
this.txtCurrentReg.TabIndex = 8;
this.txtCurrentReg.TextChanged += new System.EventHandler(this.txtCurrentReg_TextChanged);
//
@@ -170,20 +166,18 @@
//
this.txtTotalRegs.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.txtTotalRegs.Location = new System.Drawing.Point(262, 5);
this.txtTotalRegs.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5);
this.txtTotalRegs.Location = new System.Drawing.Point(175, 3);
this.txtTotalRegs.Name = "txtTotalRegs";
this.txtTotalRegs.ReadOnly = true;
this.txtTotalRegs.Size = new System.Drawing.Size(251, 26);
this.txtTotalRegs.Size = new System.Drawing.Size(167, 20);
this.txtTotalRegs.TabIndex = 9;
//
// btnFirstReg
//
this.btnFirstReg.Font = new System.Drawing.Font("Courier New", 9.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.btnFirstReg.Location = new System.Drawing.Point(0, 0);
this.btnFirstReg.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5);
this.btnFirstReg.Name = "btnFirstReg";
this.btnFirstReg.Size = new System.Drawing.Size(54, 31);
this.btnFirstReg.Size = new System.Drawing.Size(36, 23);
this.btnFirstReg.TabIndex = 4;
this.btnFirstReg.Text = "|<";
this.btnFirstReg.UseVisualStyleBackColor = true;
@@ -193,10 +187,9 @@
//
this.btnLastReg.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
this.btnLastReg.Font = new System.Drawing.Font("Courier New", 9.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.btnLastReg.Location = new System.Drawing.Point(711, 0);
this.btnLastReg.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5);
this.btnLastReg.Location = new System.Drawing.Point(474, 0);
this.btnLastReg.Name = "btnLastReg";
this.btnLastReg.Size = new System.Drawing.Size(54, 31);
this.btnLastReg.Size = new System.Drawing.Size(36, 23);
this.btnLastReg.TabIndex = 7;
this.btnLastReg.Text = ">|";
this.btnLastReg.UseVisualStyleBackColor = true;
@@ -206,10 +199,9 @@
//
this.btnNextReg.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
this.btnNextReg.Font = new System.Drawing.Font("Courier New", 9.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.btnNextReg.Location = new System.Drawing.Point(649, 0);
this.btnNextReg.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5);
this.btnNextReg.Location = new System.Drawing.Point(433, 0);
this.btnNextReg.Name = "btnNextReg";
this.btnNextReg.Size = new System.Drawing.Size(54, 31);
this.btnNextReg.Size = new System.Drawing.Size(36, 23);
this.btnNextReg.TabIndex = 6;
this.btnNextReg.Text = ">";
this.btnNextReg.UseVisualStyleBackColor = true;
@@ -217,13 +209,12 @@
//
// FrmCsvViewer
//
this.AutoScaleDimensions = new System.Drawing.SizeF(9F, 20F);
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(798, 802);
this.ClientSize = new System.Drawing.Size(532, 521);
this.Controls.Add(this.pnlScrollData);
this.Controls.Add(this.grpFile);
this.Controls.Add(this.pnlReg);
this.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5);
this.Name = "FrmCsvViewer";
this.Text = "CsvViewer";
this.grpFile.ResumeLayout(false);

75
FrmCsvViewer.cs
View File

@@ -11,7 +11,7 @@ namespace CsvView
{
InitializeComponent();
}
private void txtPath_DoubleClick(object sender, EventArgs e)
{
OpenFileDialog loadDialog = new OpenFileDialog();
@@ -49,72 +49,15 @@ namespace CsvView
{
_loadedFile = fileName;
txtPath.Text = fileName;
DateTime dtFile = File.GetCreationTime(_loadedFile);
string indexFile = _loadedFile + ".idx";
if (File.Exists(indexFile) && File.GetCreationTime(indexFile) > dtFile)
{
List<long> tempIndex = Index_LoadFile(indexFile);
_index = tempIndex;
_totalRegs = _index.Count - 1;
}
else
{
// Generate index
DateTime dtNow = DateTime.UtcNow;
var csvParser = new CsvParser();
csvParser.GenerateIndex(_loadedFile);
TimeSpan tsGenIndex = DateTime.UtcNow - dtNow;
var csvIndexer = new CsvIndexer();
csvIndexer.LoadIndexOfFile(_loadedFile);
_index = csvIndexer.Index;
_totalRegs = _index.Count - 1;
_index = csvParser.Index;
_totalRegs = _index.Count - 1;
// Save Index if expensive generation
if (tsGenIndex.TotalSeconds > 2)
{
Index_SaveFile(indexFile);
}
}
RenderReg(0);
}
private void Index_SaveFile(string indexFile)
{
if (File.Exists(indexFile))
{
File.Delete(indexFile);
}
Stream streamOut = File.Open(indexFile, FileMode.Create);
using (BinaryWriter binWriter = new BinaryWriter(streamOut))
{
binWriter.Write(_index.Count);
for (int i = 0; i < _index.Count; i++)
{
binWriter.Write(_index[i]);
}
}
streamOut.Close();
}
private static List<long> Index_LoadFile(string indexFile)
{
var tempIndex = new List<long>();
Stream streamIn = File.Open(indexFile, FileMode.Open);
using (BinaryReader binReader = new BinaryReader(streamIn))
{
int numRegs = binReader.ReadInt32();
for (int i = 0; i < numRegs; i++)
{
long value = binReader.ReadInt64();
tempIndex.Add(value);
}
}
streamIn.Close();
return tempIndex;
}
private List<string> Index_LoadReg(int idx)
{
var csvParser = new CsvParser();
@@ -150,7 +93,7 @@ namespace CsvView
pnlScrollData.SuspendDrawing();
pnlScrollData.VerticalScroll.Value = 0;
pnlData.Height = 10;
pnlData.Controls.Clear();
_currentReg = currentReg;
txtCurrentReg.Text = Convert.ToString(currentReg);
@@ -162,7 +105,7 @@ namespace CsvView
btnNextReg.Enabled = (last == false);
List<string> currentData = Index_LoadReg((int)currentReg);
int y = 0;
const int TexboxPadding = 5;
const int PaddingLeft = 0;
@@ -213,7 +156,7 @@ namespace CsvView
pnlScrollData.SuspendDrawing();
pnlScrollData.VerticalScroll.Value = 0;
pnlData.Height = 10;
pnlData.Controls.Clear();
pnlReg.Enabled = false;
txtCurrentReg.Text = string.Empty;
@@ -222,7 +165,7 @@ namespace CsvView
pnlScrollData.ResumeDrawing();
_rendering = false;
}
private void btnFirstReg_Click(object sender, EventArgs e)
{
RenderReg(0);