Created
November 22, 2019 13:21
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| public static class SimpleCSVParser { | |
| static List<List<string>> ParseCSV(string text) { | |
| var list = new List<List<string>>(); | |
| List<string> row = null; | |
| var sb = new StringBuilder(); | |
| int i = 0; | |
| while (i < text.Length) { | |
| var c = text[i++]; | |
| if (c == '"') { | |
| ReadString(text, ref i, sb); | |
| } else if (c == '\r') { | |
| continue; | |
| } else if (c == '\n') { | |
| AddCell(ref row, sb); | |
| AddRow(list, ref row); | |
| } else if (c == ',') { | |
| AddCell(ref row, sb); | |
| } else { | |
| sb.Append(c); | |
| } | |
| } | |
| AddCell(ref row, sb); | |
| AddRow(list, ref row); | |
| return list; | |
| } | |
| static void AddCell(ref List<string> row, StringBuilder sb) { | |
| if (row == null) { | |
| row = new List<string>(); | |
| } | |
| row.Add(sb.ToString()); | |
| sb.Length = 0; | |
| } | |
| static void AddRow(List<List<string>> list, ref List<string> row) { | |
| if (row != null) { | |
| list.Add(row); | |
| row = null; | |
| } | |
| } | |
| static void ReadString(string text, ref int i, StringBuilder sb) { | |
| while (i < text.Length) { | |
| var c = text[i++]; | |
| if (c == '"') { | |
| if (i >= text.Length) { | |
| return; | |
| } | |
| c = text[i++]; | |
| if (c != '"') { | |
| i--; | |
| return; | |
| } | |
| } | |
| sb.Append(c); | |
| } | |
| } | |
| } |
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