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64 lines
2.4 KiB
C#
64 lines
2.4 KiB
C#
using System.Globalization;
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namespace AIStudio.Tools;
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/// <summary>
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/// Writes rows of character-separated values. Fields are quoted according to RFC 4180 using the
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/// separator of the respective file.
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/// </summary>
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public static class CsvWriter
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{
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/// <summary>
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/// The separator a spreadsheet expects from a CSV file written for the given language.
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/// </summary>
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/// <remarks>
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/// Wherever a comma separates the decimals of a number, it cannot separate the columns of a
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/// file as well: German Excel therefore expects a semicolon and puts a comma-separated file
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/// into a single column. This is the same rule Excel itself follows when it writes a CSV, so
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/// we ask the culture rather than keeping a list of languages of our own.
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/// </remarks>
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/// <param name="ietfTag">The IETF tag of the language, for example "de-DE".</param>
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/// <returns>The separator to write with.</returns>
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public static char SeparatorFor(string ietfTag)
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{
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if (string.IsNullOrWhiteSpace(ietfTag))
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return ',';
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try
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{
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var culture = CultureInfo.GetCultureInfo(ietfTag);
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return culture.NumberFormat.NumberDecimalSeparator is "," ? ';' : ',';
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}
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catch (CultureNotFoundException)
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{
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return ',';
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}
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}
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/// <summary>
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/// Joins the given fields into one row.
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/// </summary>
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/// <param name="separator">The separator between two fields.</param>
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/// <param name="fields">The fields of the row.</param>
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/// <returns>The row, without a line ending.</returns>
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public static string ToRow(char separator, params string[] fields) => string.Join(separator, fields.Select(field => ToField(field, separator)));
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/// <summary>
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/// Quotes one field according to RFC 4180.
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/// </summary>
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private static string ToField(string text, char separator)
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{
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if (string.IsNullOrEmpty(text))
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return string.Empty;
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// Quoting the complete field is important for long and multi-line AI
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// answers: neither separators nor line breaks within an answer may
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// create another column or row.
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if (!text.Contains(separator) && !text.Contains('"') && !text.Contains('\n') && !text.Contains('\r'))
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return text;
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return $"""
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"{text.Replace("\"", "\"\"")}"
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""";
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}
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} |