■ CSV 파서를 사용하는 방법을 보여준다.
▶ CSVParser.cs
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using System; using System.Collections.Generic; using System.IO; using System.Text; namespace TestProject { /// <summary> /// CSV 파서 /// </summary> public static class CSVParser { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 파싱하기 - Parse(reader, delimiter, qualifier) /// <summary> /// 파싱하기 /// </summary> /// <param name="reader">텍스트 리더</param> /// <param name="delimiter">구분자</param> /// <param name="qualifier">품질 구분자</param> /// <returns>문자열 리스트 열거 가능형</returns> public static IEnumerable<IList<string>> Parse(TextReader reader, char delimiter, char qualifier) { bool inQuote = false; List<string> recordList = new List<string>(); StringBuilder stringBuilder = new StringBuilder(); while(reader.Peek() != -1) { char characterRead = (char)reader.Read(); if(characterRead == '\n' || (characterRead == '\r' && (char) reader.Peek() == '\n')) { if(characterRead == '\r') { reader.Read(); } if(inQuote) { if(characterRead == '\r') { stringBuilder.Append('\r'); } stringBuilder.Append('\n'); } else { if(recordList.Count > 0 || stringBuilder.Length > 0) { recordList.Add(stringBuilder.ToString()); stringBuilder.Clear(); } if(recordList.Count > 0) { yield return recordList; } recordList = new List<string>(recordList.Count); } } else if(stringBuilder.Length == 0 && !inQuote) { if(characterRead == qualifier) { inQuote = true; } else if(characterRead == delimiter) { recordList.Add(stringBuilder.ToString()); stringBuilder.Clear(); } else if(char.IsWhiteSpace(characterRead)) { } else { stringBuilder.Append(characterRead); } } else if(characterRead == delimiter) { if (inQuote) { stringBuilder.Append(delimiter); } else { recordList.Add(stringBuilder.ToString()); stringBuilder.Clear(); } } else if(characterRead == qualifier) { if(inQuote) { if((char) reader.Peek() == qualifier) { reader.Read(); stringBuilder.Append(qualifier); } else { inQuote = false; } } else { stringBuilder.Append(characterRead); } } else { stringBuilder.Append(characterRead); } } if(recordList.Count > 0 || stringBuilder.Length > 0) { recordList.Add(stringBuilder.ToString()); } if(recordList.Count > 0) { yield return recordList; } } #endregion #region 머리말/꼬리말 파싱하기 - ParseHeadAndTail(reader, delimiter, qualifier) /// <summary> /// 머리말/꼬리말 파싱하기 /// </summary> /// <param name="reader">텍스트 리더</param> /// <param name="delimiter">구분자</param> /// <param name="qualifier">품질 구분자</param> /// <returns>(문자열 리스트, 문자열 리스트 열거 가능형) 튜플</returns> public static Tuple<IList<string>, IEnumerable<IList<string>>> ParseHeadAndTail(TextReader reader, char delimiter, char qualifier) { return ParseHeadAndTail(Parse(reader, delimiter, qualifier)); } #endregion //////////////////////////////////////////////////////////////////////////////// Private #region 꼬리말 열거하기 - EnumerateTail<T>(sourceEnumerable) /// <summary> /// 꼬리말 열거하기 /// </summary> /// <typeparam name="T">타입</typeparam> /// <param name="sourceEnumerable">소스 열거 가능형</param> /// <returns>열거 가능형</returns> private static IEnumerable<T> EnumerateTail<T>(IEnumerator<T> sourceEnumerable) { while(sourceEnumerable.MoveNext()) { yield return sourceEnumerable.Current; } } #endregion #region 머리말/꼬리말 파싱하기 - ParseHeadAndTail<T>(sourceEnumerable) /// <summary> /// 머리말/꼬리말 파싱하기 /// </summary> /// <typeparam name="T">타입</typeparam> /// <param name="sourceEnumerable">소스 열거 가능형</param> /// <returns>(타입, 타입 열거 가능형) 튜플</returns> private static Tuple<T, IEnumerable<T>> ParseHeadAndTail<T>(this IEnumerable<T> sourceEnumerable) { if(sourceEnumerable == null) { throw new ArgumentNullException("sourceEnumerable"); } IEnumerator<T> enumerator = sourceEnumerable.GetEnumerator(); enumerator.MoveNext(); return Tuple.Create(enumerator.Current, EnumerateTail(enumerator)); } #endregion } } |
▶ Program.cs
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using System; using System.Collections.Generic; using System.IO; namespace TestProject { /// <summary> /// 프로그램 /// </summary> class Program { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region 프로그램 시작하기 - Main() /// <summary> /// 프로그램 시작하기 /// </summary> private static void Main() { string source = @" '100','200','100','300','400' '200','300','400','200','100' '100','300','200','300','400' "; using(StringReader reader = new StringReader(source)) { IEnumerable<IList<string>> lineEnumerable = CSVParser.Parse(reader, ',', '\''); foreach(IList<string> itemEnumerable in lineEnumerable) { foreach(string item in itemEnumerable) { Console.Write(item); Console.Write(" "); } Console.WriteLine(); } } } #endregion } } |
