| using Lucene.Net.Support; |
| using System; |
| using System.Collections.Generic; |
| using System.Text; |
| using System.Text.RegularExpressions; |
| |
| namespace Lucene.Net.Analysis.Ja.Util |
| { |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /// <summary> |
| /// Utility class for parsing CSV text |
| /// </summary> |
| public sealed class CSVUtil |
| { |
| private const char QUOTE = '"'; |
| |
| private const char COMMA = ','; |
| |
| private static readonly Regex QUOTE_REPLACE_PATTERN = new Regex("^\"([^\"]+)\"$", RegexOptions.Compiled); |
| |
| private const string ESCAPED_QUOTE = "\"\""; |
| |
| private CSVUtil() { } // no instance!!! |
| |
| /// <summary> |
| /// Parse CSV line |
| /// </summary> |
| /// <param name="line">line containing csv-encoded data</param> |
| /// <returns>Array of values</returns> |
| public static string[] Parse(string line) |
| { |
| bool insideQuote = false; |
| List<string> result = new List<string>(); |
| int quoteCount = 0; |
| StringBuilder sb = new StringBuilder(); |
| for (int i = 0; i < line.Length; i++) |
| { |
| char c = line[i]; |
| |
| if (c == QUOTE) |
| { |
| insideQuote = !insideQuote; |
| quoteCount++; |
| } |
| |
| if (c == COMMA && !insideQuote) |
| { |
| string value = sb.ToString(); |
| value = UnQuoteUnEscape(value); |
| result.Add(value); |
| sb.Length = 0; |
| continue; |
| } |
| |
| sb.Append(c); |
| } |
| |
| result.Add(sb.ToString()); |
| |
| // Validate |
| if (quoteCount % 2 != 0) |
| { |
| return Arrays.Empty<string>(); |
| } |
| |
| return result.ToArray(/*new String[result.size()]*/); |
| } |
| |
| private static string UnQuoteUnEscape(string original) |
| { |
| string result = original; |
| |
| // Unquote |
| if (result.IndexOf('\"') >= 0) |
| { |
| Match m = QUOTE_REPLACE_PATTERN.Match(original); |
| if (m.Success) |
| { |
| result = m.Groups[1].Value; |
| } |
| |
| // Unescape |
| if (result.IndexOf(ESCAPED_QUOTE, StringComparison.Ordinal) >= 0) |
| { |
| result = result.Replace(ESCAPED_QUOTE, "\""); |
| } |
| } |
| |
| return result; |
| } |
| |
| /// <summary> |
| /// Quote and escape input value for CSV |
| /// </summary> |
| public static string QuoteEscape(string original) |
| { |
| string result = original; |
| |
| if (result.IndexOf('\"') >= 0) |
| { |
| result.Replace("\"", ESCAPED_QUOTE); |
| } |
| if (result.IndexOf(COMMA) >= 0) |
| { |
| result = "\"" + result + "\""; |
| } |
| return result; |
| } |
| } |
| } |