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// Copyright (c) Dr. Dirk Lellinger. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SlobViewer.Text
{
/// <summary>
/// Reads a text file as can be found at the TU Chemnitz (see <see href="http://dict.tu-chemnitz.de/"/>)
/// </summary>
public class TextReader
{
/// <summary>
/// The full file name of the text file.
/// </summary>
string _fileName;
static readonly char[] _partSeparator = new char[] { '|' };
static readonly char[] _subPartSeparator = new char[] { ';' };
/// <summary>Initializes a new instance of the <see cref="TextReader"/> class.</summary>
/// <param name="fileName">Full file name of the text file.</param>
public TextReader(string fileName)
{
_fileName = fileName;
}
/// <summary>
/// Reads from the text file given in the constructor of this class and generates a dictionary.
/// </summary>
/// <returns>A dictionary of key-value pairs.</returns>
public Dictionary<string, string> Read()
{
var dictionary = new Dictionary<string, string>();
var keyList = new List<string>();
using (var stream = new FileStream(_fileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
string line;
using (var xr = new StreamReader(stream))
{
while (null != (line = xr.ReadLine()))
{
if (line.Length == 0 || line[0] == '#')
continue;
// a line is separated by two colons in the part of the one language and the part with the other language
// inside every part there may be additional separations by | (hopefully the same number in both language parts)
var idx = line.IndexOf("::");
if (idx < 0)
continue;
var part1 = line.Substring(0, idx);
var part2 = line.Substring(idx + 2);
var parts1 = part1.Split(_partSeparator, StringSplitOptions.None);
var parts2 = part2.Split(_partSeparator, StringSplitOptions.None);
for (int i = 0; i < parts2.Length; ++i)
{
var keyt = parts2[i].Trim();
var value = parts1[i].Trim();
var keyParts = keyt.Split(_subPartSeparator, StringSplitOptions.RemoveEmptyEntries);
foreach (var keya in keyParts)
{
var key = keya.Trim();
if (!string.IsNullOrEmpty(key) && !string.IsNullOrEmpty(value))
{
if (dictionary.TryGetValue(key, out var existingValue))
{
existingValue += "\r\n" + value;
dictionary[key] = existingValue;
}
else
{
dictionary.Add(key, value);
}
}
}
}
}
}
}
return dictionary;
}
}
}
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