Cosmos/source2/Debug/System.Data.SQLite.Linq/SQL Generation/StringUtil.cs

/********************************************************
 * ADO.NET 2.0 Data Provider for SQLite Version 3.X
 * Written by Robert Simpson (robert@blackcastlesoft.com)
 * 
 * Released to the public domain, use at your own risk!
 ********************************************************/

using System.Collections.Generic;
using System.Text;
using System.Globalization;
using System.Collections;

#if NET_40 || NET_45
using System.Runtime;
#endif

namespace System.Data.SQLite
{
	internal static class StringUtil
	{
		// Fields
		private const string s_defaultDelimiter = ", ";

		// Methods
		internal static string BuildDelimitedList<T>(IEnumerable<T> values, ToStringConverter<T> converter, string delimiter)
		{
			if (values == null)
			{
				return string.Empty;
			}
			if (converter == null)
			{
				converter = new ToStringConverter<T>(StringUtil.InvariantConvertToString<T>);
			}
			if (delimiter == null)
			{
				delimiter = ", ";
			}
			StringBuilder builder = new StringBuilder();
			bool flag = true;
			foreach (T local in values)
			{
				if (flag)
				{
					flag = false;
				}
				else
				{
					builder.Append(delimiter);
				}
				builder.Append(converter(local));
			}
			return builder.ToString();
		}

		internal static string FormatIndex(string arrayVarName, int index)
		{
			StringBuilder builder = new StringBuilder((arrayVarName.Length + 10) + 2);
			return builder.Append(arrayVarName).Append('[').Append(index).Append(']').ToString();
		}

		internal static string FormatInvariant(string format, params object[] args)
		{
			return string.Format(CultureInfo.InvariantCulture, format, args);
		}

		internal static StringBuilder FormatStringBuilder(StringBuilder builder, string format, params object[] args)
		{
			builder.AppendFormat(CultureInfo.InvariantCulture, format, args);
			return builder;
		}

		internal static StringBuilder IndentNewLine(StringBuilder builder, int indent)
		{
			builder.AppendLine();
			for (int i = 0; i < indent; i++)
			{
				builder.Append("    ");
			}
			return builder;
		}

		private static string InvariantConvertToString<T>(T value)
		{
			return string.Format(CultureInfo.InvariantCulture, "{0}", new object[] { value });
		}

#if NET_40 || NET_45
		[TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
#endif
		internal static bool IsNullOrEmptyOrWhiteSpace(string value)
		{
			return IsNullOrEmptyOrWhiteSpace(value, 0);
		}

		internal static bool IsNullOrEmptyOrWhiteSpace(string value, int offset)
		{
			if (value != null)
			{
				for (int i = offset; i < value.Length; i++)
				{
					if (!char.IsWhiteSpace(value[i]))
					{
						return false;
					}
				}
			}
			return true;
		}

		internal static bool IsNullOrEmptyOrWhiteSpace(string value, int offset, int length)
		{
			if (value != null)
			{
				length = Math.Min(value.Length, length);
				for (int i = offset; i < length; i++)
				{
					if (!char.IsWhiteSpace(value[i]))
					{
						return false;
					}
				}
			}
			return true;
		}

		internal static string MembersToCommaSeparatedString(IEnumerable members)
		{
			StringBuilder builder = new StringBuilder();
			builder.Append("{");
			ToCommaSeparatedString(builder, members);
			builder.Append("}");
			return builder.ToString();
		}

		internal static string ToCommaSeparatedString(IEnumerable list)
		{
			return ToSeparatedString(list, ", ", string.Empty);
		}

		internal static void ToCommaSeparatedString(StringBuilder builder, IEnumerable list)
		{
			ToSeparatedStringPrivate(builder, list, ", ", string.Empty, false);
		}

		internal static string ToCommaSeparatedStringSorted(IEnumerable list)
		{
			return ToSeparatedStringSorted(list, ", ", string.Empty);
		}

		internal static void ToCommaSeparatedStringSorted(StringBuilder builder, IEnumerable list)
		{
			ToSeparatedStringPrivate(builder, list, ", ", string.Empty, true);
		}

		internal static string ToSeparatedString(IEnumerable list, string separator, string nullValue)
		{
			StringBuilder stringBuilder = new StringBuilder();
			ToSeparatedString(stringBuilder, list, separator, nullValue);
			return stringBuilder.ToString();
		}

		internal static void ToSeparatedString(StringBuilder builder, IEnumerable list, string separator)
		{
			ToSeparatedStringPrivate(builder, list, separator, string.Empty, false);
		}

#if NET_40 || NET_45
		[TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
#endif
		internal static void ToSeparatedString(StringBuilder stringBuilder, IEnumerable list, string separator, string nullValue)
		{
			ToSeparatedStringPrivate(stringBuilder, list, separator, nullValue, false);
		}

		private static void ToSeparatedStringPrivate(StringBuilder stringBuilder, IEnumerable list, string separator, string nullValue, bool toSort)
		{
			if (list != null)
			{
				bool flag = true;
				List<string> list2 = new List<string>();
				foreach (object obj2 in list)
				{
					string str;
					if (obj2 == null)
					{
						str = nullValue;
					}
					else
					{
						str = FormatInvariant("{0}", new object[] { obj2 });
					}
					list2.Add(str);
				}
				if (toSort)
				{
					list2.Sort(StringComparer.Ordinal);
				}
				foreach (string str2 in list2)
				{
					if (!flag)
					{
						stringBuilder.Append(separator);
					}
					stringBuilder.Append(str2);
					flag = false;
				}
			}
		}

		internal static string ToSeparatedStringSorted(IEnumerable list, string separator, string nullValue)
		{
			StringBuilder stringBuilder = new StringBuilder();
			ToSeparatedStringPrivate(stringBuilder, list, separator, nullValue, true);
			return stringBuilder.ToString();
		}

		internal static void ToSeparatedStringSorted(StringBuilder builder, IEnumerable list, string separator)
		{
			ToSeparatedStringPrivate(builder, list, separator, string.Empty, true);
		}

		// Nested Types
		internal delegate string ToStringConverter<T>(T value);
	}
}