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245 lines
10 KiB
C#
245 lines
10 KiB
C#
//---------------------------------------------------------------------
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// <copyright file="StringUtil.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//
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// @owner Microsoft
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// @backupOwner Microsoft
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//---------------------------------------------------------------------
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Text;
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using System.Globalization;
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using System.Diagnostics;
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namespace System.Data.Common.Utils {
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// This class provides some useful string utilities, e.g., converting a
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// list to string.
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internal static class StringUtil {
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private const string s_defaultDelimiter = ", ";
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#region String Conversion - Unsorted
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/// <summary>
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/// Converts an enumeration of values to a delimited string list.
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/// </summary>
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/// <typeparam name="T">Type of elements to convert.</typeparam>
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/// <param name="values">Values. If null, returns empty string.</param>
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/// <param name="converter">Converter. If null, uses default invariant culture converter.</param>
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/// <param name="delimiter">Delimiter. If null, uses default (', ')</param>
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/// <returns>Delimited list of values in string.</returns>
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internal static string BuildDelimitedList<T>(IEnumerable<T> values, ToStringConverter<T> converter, string delimiter) {
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if (null == values) { return String.Empty; }
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if (null == converter) { converter = new ToStringConverter<T>(InvariantConvertToString<T>); }
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if (null == delimiter) { delimiter = s_defaultDelimiter; }
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StringBuilder sb = new StringBuilder();
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bool first = true;
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foreach (T value in values) {
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if (first) { first = false; }
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else { sb.Append(delimiter); }
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sb.Append(converter(value));
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}
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return sb.ToString();
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}
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// effects: Converts list to a string separated by a comma with
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// string.Empty used for null values
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internal static string ToCommaSeparatedString(IEnumerable list) {
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return ToSeparatedString(list, s_defaultDelimiter, string.Empty);
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}
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// effects: Converts list to a string separated by "separator" with
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// "nullValue" used for null values
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internal static string ToSeparatedString(IEnumerable list, string separator, string nullValue) {
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StringBuilder builder = new StringBuilder();
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ToSeparatedString(builder, list, separator, nullValue);
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return builder.ToString();
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}
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#endregion
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#region String Conversion - Sorted
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// effects: Converts the list to a list of strings, sorts its
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// and then converts to a string separated by a comma with
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// string.Empty used for null values
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internal static string ToCommaSeparatedStringSorted(IEnumerable list) {
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return ToSeparatedStringSorted(list, s_defaultDelimiter, string.Empty);
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}
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// effects: Converts the list to a list of strings, sorts its using
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// StringComparer.Ordinal
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// and then converts to a string separated by "separator" with
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// with "nullValue" used for null values
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internal static string ToSeparatedStringSorted(IEnumerable list, string separator, string nullValue) {
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StringBuilder builder = new StringBuilder();
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ToSeparatedStringPrivate(builder, list, separator, nullValue, true);
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return builder.ToString();
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}
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#endregion
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#region StringBuilder routines
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internal static string MembersToCommaSeparatedString(IEnumerable members)
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{
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StringBuilder builder = new StringBuilder();
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builder.Append("{");
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StringUtil.ToCommaSeparatedString(builder, members);
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builder.Append("}");
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return builder.ToString();
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}
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internal static void ToCommaSeparatedString(StringBuilder builder, IEnumerable list) {
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ToSeparatedStringPrivate(builder, list, s_defaultDelimiter, string.Empty, false);
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}
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internal static void ToCommaSeparatedStringSorted(StringBuilder builder, IEnumerable list) {
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ToSeparatedStringPrivate(builder, list, s_defaultDelimiter, string.Empty, true);
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}
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internal static void ToSeparatedString(StringBuilder builder, IEnumerable list, string separator) {
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ToSeparatedStringPrivate(builder, list, separator, string.Empty, false);
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}
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internal static void ToSeparatedStringSorted(StringBuilder builder, IEnumerable list, string separator) {
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ToSeparatedStringPrivate(builder, list, separator, string.Empty, true);
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}
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// effects: Modifies stringBuilder to contain a string of values from list
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// separated by "separator" with "nullValue" used for null values
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internal static void ToSeparatedString(StringBuilder stringBuilder, IEnumerable list, string separator,
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string nullValue) {
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ToSeparatedStringPrivate(stringBuilder, list, separator, nullValue, false);
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}
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// effects: Converts the list to a list of strings, sorts its (if
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// toSort is true) and then converts to a string separated by
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// "separator" with "nullValue" used for null values.
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private static void ToSeparatedStringPrivate(StringBuilder stringBuilder, IEnumerable list, string separator,
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string nullValue, bool toSort) {
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if (null == list) {
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return;
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}
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bool isFirst = true;
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// Get the list of strings first
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List<string> elementStrings = new List<string>();
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foreach (object element in list) {
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string str;
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// Get the element or its default null value
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if (element == null) {
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str = nullValue;
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} else {
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str = FormatInvariant("{0}", element);
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}
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elementStrings.Add(str);
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}
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if (toSort == true) {
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// Sort the list
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elementStrings.Sort(StringComparer.Ordinal);
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}
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// Now add the strings to the stringBuilder
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foreach (string str in elementStrings) {
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if (false == isFirst) {
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stringBuilder.Append(separator);
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}
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stringBuilder.Append(str);
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isFirst = false;
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}
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}
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#endregion
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#region Some Helper routines
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/// <summary>
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/// This private static method checks a string to make sure that it is not empty.
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/// Comparing with String.Empty is not sufficient since a string with nothing
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/// but white space isn't considered "empty" by that rationale.
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/// </summary>
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internal static bool IsNullOrEmptyOrWhiteSpace(string value)
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{
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return IsNullOrEmptyOrWhiteSpace(value, 0);
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}
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internal static bool IsNullOrEmptyOrWhiteSpace(string value, int offset)
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{
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// don't use Trim(), which will copy the string, which may be large, just to test for emptyness
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//return String.IsNullOrEmpty(value) || String.IsNullOrEmpty(value.Trim());
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if (null != value)
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{
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for(int i = offset; i < value.Length; ++i)
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{
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if (!Char.IsWhiteSpace(value[i]))
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{
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return false;
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}
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}
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}
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return true;
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}
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// separate implementation from IsNullOrEmptyOrWhiteSpace(string, int) because that one will
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// pick up the jit optimization to avoid boundary checks and the this won't is unknown (most likely not)
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[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")] // referenced by System.Data.Entity.Design.dll
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internal static bool IsNullOrEmptyOrWhiteSpace(string value, int offset, int length)
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{
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// don't use Trim(), which will copy the string, which may be large, just to test for emptyness
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//return String.IsNullOrEmpty(value) || String.IsNullOrEmpty(value.Trim());
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if (null != value)
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{
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length = Math.Min(value.Length, length);
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for(int i = offset; i < length; ++i)
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{
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if (!Char.IsWhiteSpace(value[i]))
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{
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return false;
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}
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}
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}
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return true;
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}
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internal static string FormatInvariant(string format, params object[] args) {
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Debug.Assert(args.Length > 0, "Formatting utilities must be called with at least one argument");
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return String.Format(CultureInfo.InvariantCulture, format, args);
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}
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// effects: Formats args according to the format string and adds it
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// to builder. Returns the modified builder
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internal static StringBuilder FormatStringBuilder(StringBuilder builder, string format, params object[] args) {
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Debug.Assert(args.Length > 0, "Formatting utilities must be called with at least one argument");
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builder.AppendFormat(CultureInfo.InvariantCulture, format, args);
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return builder;
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}
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// effects: Generates a new line and then indents the new line by
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// indent steps in builder -- indent steps are determined internally
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// by this method. Returns the modified builder
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internal static StringBuilder IndentNewLine(StringBuilder builder, int indent) {
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builder.AppendLine();
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for (int i = 0; i < indent; i++) {
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builder.Append(" ");
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}
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return builder;
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}
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// effects: returns a string of the form 'arrayVarName[index]'
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internal static string FormatIndex(string arrayVarName, int index) {
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System.Text.StringBuilder builder = new System.Text.StringBuilder(arrayVarName.Length + 10 + 2);
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return builder.Append(arrayVarName).Append('[').Append(index).Append(']').ToString();
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}
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private static string InvariantConvertToString<T>(T value) {
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return String.Format(CultureInfo.InvariantCulture, "{0}", value);
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}
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#endregion
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#region Delegates
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internal delegate string ToStringConverter<T>(T value);
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#endregion
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}
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}
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