Move CsvIndexer and CsvParser to CsvLib project.

CsvLib/CsvParser.cs

@@ -0,0 +1,109 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+
+namespace CsvLib
+{
+    public class CsvParser
+    {
+        private bool _insideString;
+
+        private readonly char _separator;
+        private readonly char _quoteChar;
+        private readonly char _escapeChar;
+
+        public CsvParser(char separator = ',', char quoteChar = '"', char escapeChar = '\\')
+        {
+            _separator = separator;
+            _quoteChar = quoteChar;
+            _escapeChar = escapeChar;
+        }
+
+        private List<List<string>> _data = new List<List<string>>();
+
+        private List<string> _currentReg;
+        StringBuilder _currentCell;
+
+        public List<List<string>> Data
+        {
+            get { return _data; }
+        }
+
+        public void ParseLine(string line)
+        {
+            if (_currentReg == null)
+            {
+                _currentReg = new List<string>();
+            }
+            if (_currentCell == null)
+            {
+                _currentCell = new StringBuilder();
+            }
+
+            for (int i = 0; i < line.Length; i++)
+            {
+                char c = line[i];
+                if (c == _separator && _insideString == false)
+                {
+                    _currentReg.Add(_currentCell.ToString());
+                    _currentCell.Clear();
+                    continue;
+                }
+                if (c == _quoteChar && _insideString == false)
+                {
+                    _insideString = true;
+                    continue;
+                }
+                if (c == _quoteChar && _insideString)
+                {
+                    _insideString = false;
+                    continue;
+                }
+                if (c == _escapeChar && _insideString)
+                {
+                    i++;
+                    if (i == line.Length) { break; }
+                    c = line[i];
+                }
+
+                _currentCell.Append(c);
+            }
+
+
+            if (_insideString)
+            {
+                _currentCell.Append('\n');
+            }
+            else
+            {
+                _currentReg.Add(_currentCell.ToString());
+                _currentCell.Clear();
+                _data.Add(_currentReg);
+                _currentReg = null;
+            }
+        }
+
+        public void ParseFile(string file, long offset = 0, int count = 0)
+        {
+            _insideString = false;
+            _data = new List<List<string>>();
+            _currentReg = null;
+            FileStream stream = new FileStream(file, FileMode.Open);
+            stream.Seek(offset, SeekOrigin.Begin);
+            using (StreamReader reader = new StreamReader(stream, Encoding.Default, true, 4096))
+            {
+                string currentLine;
+                while ((currentLine = reader.ReadLine()) != null)
+                {
+                    ParseLine(currentLine);
+                    if (count > 0 && Data.Count == count)
+                    {
+                        break;
+                    }
+                }
+            }
+            stream.Close();
+        }
+        
+    }
+}