brianlagunas_cp
15 years ago
4 changed files with 239 additions and 77 deletions
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using System; |
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using System.Collections.Generic; |
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using System.Linq; |
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using System.Text; |
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using System.Globalization; |
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using System.Text.RegularExpressions; |
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namespace Microsoft.Windows.Controls |
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{ |
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internal class DateTimeParser |
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{ |
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#region Properties
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private DateTimeFormatInfo DateTimeFormatInfo { get; set; } |
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public string Format { get; set; } |
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private IEnumerable<string> MonthNames { get { return DateTimeFormatInfo.AbbreviatedMonthNames.Union(DateTimeFormatInfo.MonthNames); } } |
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#endregion //Properties
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#region Constructors
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public DateTimeParser(DateTimeFormatInfo dateTimeFormatInfo) |
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{ |
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DateTimeFormatInfo = dateTimeFormatInfo; |
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} |
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public DateTimeParser(DateTimeFormatInfo dateTimeFormatInfo, string format) |
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{ |
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DateTimeFormatInfo = dateTimeFormatInfo; |
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Format = format; |
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} |
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#endregion //Constructors
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#region Methods
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public bool TryParse(string value, out DateTime result, DateTime currentDate) |
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{ |
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bool success = false; |
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result = currentDate; |
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if (string.IsNullOrEmpty(value)) |
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return false; |
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//parse date
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DateTime date; |
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success = TryParseDate(value, out date, currentDate); |
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//parse time
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DateTime time; |
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success = TryParseTime(value, out time, currentDate); |
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//merge the two
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result = MergeDateAndTime(date, time); |
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return success; |
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} |
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#region Parse Date
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public bool TryParseDate(string value, out DateTime result, DateTime currentDate) |
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{ |
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bool success = false; |
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result = currentDate; |
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if (string.IsNullOrEmpty(value)) |
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return false; |
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var dateParts = GetDateParts(ResolveDateString(value)).ToArray(); |
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if (dateParts.Length > 0) |
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{ |
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var dateFormatParts = DateTimeFormatInfo.ShortDatePattern.Split(new string[] { DateTimeFormatInfo.DateSeparator }, StringSplitOptions.RemoveEmptyEntries).ToList(); |
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int yearIndex = dateFormatParts.IndexOf(dateFormatParts.FirstOrDefault(e => e.Contains("y") || e.Contains("Y"))); |
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if (yearIndex >= 0 && yearIndex < dateParts.Length && dateParts[yearIndex].Length <= 2 && !dateParts.Any(dp => dp.Length > 2 && dp != dateParts[yearIndex])) |
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{ |
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if (dateParts[yearIndex].Length == 0) |
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{ |
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dateParts[yearIndex] = "00"; |
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} |
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else if (dateParts[yearIndex].Length == 1) |
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{ |
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dateParts[yearIndex] = "0" + dateParts[yearIndex]; |
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} |
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dateParts[yearIndex] = string.Format("{0}{1}", currentDate.Year / 100, dateParts[yearIndex]); |
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} |
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success = DateTime.TryParse(string.Join(DateTimeFormatInfo.DateSeparator, dateParts), DateTimeFormatInfo, DateTimeStyles.None, out result); |
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if (!success) |
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result = currentDate; |
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} |
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return success; |
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} |
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private string ResolveDateString(string date) |
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{ |
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string[] dateParts = new string[3]; // Month/Day/Year
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string[] dateSeparators = new string[] { ",", " ", "/", "-", "T" }; |
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var dates = date.Split(dateSeparators, StringSplitOptions.RemoveEmptyEntries).ToList(); |
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var formats = Format.Split(dateSeparators, StringSplitOptions.RemoveEmptyEntries).ToList(); |
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//strip out the date pieces
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for (int i = 0; i < formats.Count; i++) |
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{ |
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var format = formats[i]; |
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if (!format.Equals("dddd") && !format.Contains(DateTimeFormatInfo.AMDesignator) && !format.Contains(DateTimeFormatInfo.PMDesignator)) |
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{ |
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if (format.Contains("M")) |
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dateParts[0] = dates[i]; |
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else if (format.Contains("d")) |
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dateParts[1] = dates[i]; |
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else if (format.Contains("y")) |
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dateParts[2] = dates[i]; |
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} |
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} |
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return string.Join(DateTimeFormatInfo.DateSeparator, dateParts); |
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} |
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protected List<string> GetDateParts(string date) |
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{ |
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var months = new Regex(GetDatePattern(), RegexOptions.IgnoreCase); |
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var dateParts = months.Matches(date) |
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.OfType<Match>() |
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.Select(match => match.Value) |
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.Where(s => !string.IsNullOrEmpty(s)) |
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.ToList(); |
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return dateParts; |
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} |
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protected string GetDatePattern() |
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{ |
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var pattern = new StringBuilder(@"[0-9]+"); |
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foreach (var m in MonthNames.Where(m => !string.IsNullOrEmpty(m))) |
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{ |
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pattern.AppendFormat(@"|(?<=\b|\W|[0-9_]){0}(?=\b|\W|[0-9_])", m); |
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} |
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return pattern.ToString(); |
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} |
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#endregion //Parse Date
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#region Parse Time
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public bool TryParseTime(string value, out DateTime result, DateTime fallback) |
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{ |
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bool success = false; |
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result = fallback; |
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if (string.IsNullOrEmpty(value)) |
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return false; |
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return success; |
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} |
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private string ResolveTimeString(string time) |
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{ |
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return string.Empty; |
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} |
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#endregion //Parse Time
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public static DateTime MergeDateAndTime(DateTime date, DateTime time) |
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{ |
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return new DateTime(date.Year, date.Month, date.Day, time.Hour, time.Minute, time.Second, time.Millisecond); |
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} |
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#endregion // Methods
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} |
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} |
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