diff options
Diffstat (limited to 'netcore/System.Private.CoreLib/shared/System/Globalization/StringInfo.cs')
| -rw-r--r-- | netcore/System.Private.CoreLib/shared/System/Globalization/StringInfo.cs | 296 |
1 files changed, 0 insertions, 296 deletions
diff --git a/netcore/System.Private.CoreLib/shared/System/Globalization/StringInfo.cs b/netcore/System.Private.CoreLib/shared/System/Globalization/StringInfo.cs deleted file mode 100644 index f82d3f618c1..00000000000 --- a/netcore/System.Private.CoreLib/shared/System/Globalization/StringInfo.cs +++ /dev/null @@ -1,296 +0,0 @@ -// Licensed to the .NET Foundation under one or more agreements. -// The .NET Foundation licenses this file to you under the MIT license. -// See the LICENSE file in the project root for more information. - -using System.Diagnostics; - -namespace System.Globalization -{ - /// <summary> - /// This class defines behaviors specific to a writing system. - /// A writing system is the collection of scripts and orthographic rules - /// required to represent a language as text. - /// </summary> - public class StringInfo - { - private string _str = null!; // initialized in helper called by ctors - - private int[]? _indexes; - - public StringInfo() : this(string.Empty) - { - } - - public StringInfo(string value) - { - this.String = value; - } - - public override bool Equals(object? value) - { - return value is StringInfo otherStringInfo - && _str.Equals(otherStringInfo._str); - } - - public override int GetHashCode() => _str.GetHashCode(); - - /// <summary> - /// Our zero-based array of index values into the string. Initialize if - /// our private array is not yet, in fact, initialized. - /// </summary> - private int[]? Indexes - { - get - { - if (_indexes == null && String.Length > 0) - { - _indexes = StringInfo.ParseCombiningCharacters(String); - } - - return _indexes; - } - } - - public string String - { - get => _str; - set - { - _str = value ?? throw new ArgumentNullException(nameof(value)); - _indexes = null; - } - } - - public int LengthInTextElements => Indexes?.Length ?? 0; - - public string SubstringByTextElements(int startingTextElement) - { - // If the string is empty, no sense going further. - if (Indexes == null) - { - if (startingTextElement < 0) - { - throw new ArgumentOutOfRangeException(nameof(startingTextElement), startingTextElement, SR.ArgumentOutOfRange_NeedPosNum); - } - else - { - throw new ArgumentOutOfRangeException(nameof(startingTextElement), startingTextElement, SR.Arg_ArgumentOutOfRangeException); - } - } - - return SubstringByTextElements(startingTextElement, Indexes.Length - startingTextElement); - } - - public string SubstringByTextElements(int startingTextElement, int lengthInTextElements) - { - if (startingTextElement < 0) - { - throw new ArgumentOutOfRangeException(nameof(startingTextElement), startingTextElement, SR.ArgumentOutOfRange_NeedPosNum); - } - if (String.Length == 0 || startingTextElement >= Indexes!.Length) - { - throw new ArgumentOutOfRangeException(nameof(startingTextElement), startingTextElement, SR.Arg_ArgumentOutOfRangeException); - } - if (lengthInTextElements < 0) - { - throw new ArgumentOutOfRangeException(nameof(lengthInTextElements), lengthInTextElements, SR.ArgumentOutOfRange_NeedPosNum); - } - if (startingTextElement > Indexes.Length - lengthInTextElements) - { - throw new ArgumentOutOfRangeException(nameof(lengthInTextElements), lengthInTextElements, SR.Arg_ArgumentOutOfRangeException); - } - - int start = Indexes[startingTextElement]; - - if (startingTextElement + lengthInTextElements == Indexes.Length) - { - // We are at the last text element in the string and because of that - // must handle the call differently. - return String.Substring(start); - } - else - { - return String[start..Indexes[lengthInTextElements + startingTextElement]]; - } - } - - public static string GetNextTextElement(string str) => GetNextTextElement(str, 0); - - /// <summary> - /// Get the code point count of the current text element. - /// - /// A combining class is defined as: - /// A character/surrogate that has the following Unicode category: - /// * NonSpacingMark (e.g. U+0300 COMBINING GRAVE ACCENT) - /// * SpacingCombiningMark (e.g. U+ 0903 DEVANGARI SIGN VISARGA) - /// * EnclosingMark (e.g. U+20DD COMBINING ENCLOSING CIRCLE) - /// - /// In the context of GetNextTextElement() and ParseCombiningCharacters(), a text element is defined as: - /// 1. If a character/surrogate is in the following category, it is a text element. - /// It can NOT further combine with characters in the combinging class to form a text element. - /// * one of the Unicode category in the combinging class - /// * UnicodeCategory.Format - /// * UnicodeCateogry.Control - /// * UnicodeCategory.OtherNotAssigned - /// 2. Otherwise, the character/surrogate can be combined with characters in the combinging class to form a text element. - /// </summary> - /// <returns>The length of the current text element</returns> - internal static int GetCurrentTextElementLen(string str, int index, int len, ref UnicodeCategory ucCurrent, ref int currentCharCount) - { - Debug.Assert(index >= 0 && len >= 0, "StringInfo.GetCurrentTextElementLen() : index = " + index + ", len = " + len); - Debug.Assert(index < len, "StringInfo.GetCurrentTextElementLen() : index = " + index + ", len = " + len); - if (index + currentCharCount == len) - { - // This is the last character/surrogate in the string. - return currentCharCount; - } - - // Call an internal GetUnicodeCategory, which will tell us both the unicode category, and also tell us if it is a surrogate pair or not. - int nextCharCount; - UnicodeCategory ucNext = CharUnicodeInfo.InternalGetUnicodeCategory(str, index + currentCharCount, out nextCharCount); - if (CharUnicodeInfo.IsCombiningCategory(ucNext)) - { - // The next element is a combining class. - // Check if the current text element to see if it is a valid base category (i.e. it should not be a combining category, - // not a format character, and not a control character). - if (CharUnicodeInfo.IsCombiningCategory(ucCurrent) - || (ucCurrent == UnicodeCategory.Format) - || (ucCurrent == UnicodeCategory.Control) - || (ucCurrent == UnicodeCategory.OtherNotAssigned) - || (ucCurrent == UnicodeCategory.Surrogate)) // An unpair high surrogate or low surrogate - { - // Will fall thru and return the currentCharCount - } - else - { - // Remember the current index. - int startIndex = index; - - // We have a valid base characters, and we have a character (or surrogate) that is combining. - // Check if there are more combining characters to follow. - // Check if the next character is a nonspacing character. - index += currentCharCount + nextCharCount; - - while (index < len) - { - ucNext = CharUnicodeInfo.InternalGetUnicodeCategory(str, index, out nextCharCount); - if (!CharUnicodeInfo.IsCombiningCategory(ucNext)) - { - ucCurrent = ucNext; - currentCharCount = nextCharCount; - break; - } - index += nextCharCount; - } - - return index - startIndex; - } - } - - // The return value will be the currentCharCount. - int ret = currentCharCount; - ucCurrent = ucNext; - // Update currentCharCount. - currentCharCount = nextCharCount; - return ret; - } - - /// <summary> - /// Returns the str containing the next text element in str starting at - /// index index. If index is not supplied, then it will start at the beginning - /// of str. It recognizes a base character plus one or more combining - /// characters or a properly formed surrogate pair as a text element. - /// See also the ParseCombiningCharacters() and the ParseSurrogates() methods. - /// </summary> - public static string GetNextTextElement(string str, int index) - { - if (str == null) - { - throw new ArgumentNullException(nameof(str)); - } - - int len = str.Length; - if (index < 0 || index >= len) - { - if (index == len) - { - return string.Empty; - } - - throw new ArgumentOutOfRangeException(nameof(index), index, SR.ArgumentOutOfRange_Index); - } - - int charLen; - UnicodeCategory uc = CharUnicodeInfo.InternalGetUnicodeCategory(str, index, out charLen); - return str.Substring(index, GetCurrentTextElementLen(str, index, len, ref uc, ref charLen)); - } - - public static TextElementEnumerator GetTextElementEnumerator(string str) - { - return GetTextElementEnumerator(str, 0); - } - - public static TextElementEnumerator GetTextElementEnumerator(string str, int index) - { - if (str == null) - { - throw new ArgumentNullException(nameof(str)); - } - - int len = str.Length; - if (index < 0 || index > len) - { - throw new ArgumentOutOfRangeException(nameof(index), index, SR.ArgumentOutOfRange_Index); - } - - return new TextElementEnumerator(str, index, len); - } - - /// <summary> - /// Returns the indices of each base character or properly formed surrogate - /// pair within the str. It recognizes a base character plus one or more - /// combining characters or a properly formed surrogate pair as a text - /// element and returns the index of the base character or high surrogate. - /// Each index is the beginning of a text element within a str. The length - /// of each element is easily computed as the difference between successive - /// indices. The length of the array will always be less than or equal to - /// the length of the str. For example, given the str - /// \u4f00\u302a\ud800\udc00\u4f01, this method would return the indices: - /// 0, 2, 4. - /// </summary> - public static int[] ParseCombiningCharacters(string str) - { - if (str == null) - { - throw new ArgumentNullException(nameof(str)); - } - - int len = str.Length; - int[] result = new int[len]; - if (len == 0) - { - return result; - } - - int resultCount = 0; - - int i = 0; - int currentCharLen; - UnicodeCategory currentCategory = CharUnicodeInfo.InternalGetUnicodeCategory(str, 0, out currentCharLen); - - while (i < len) - { - result[resultCount++] = i; - i += GetCurrentTextElementLen(str, i, len, ref currentCategory, ref currentCharLen); - } - - if (resultCount < len) - { - int[] returnArray = new int[resultCount]; - Array.Copy(result, returnArray, resultCount); - return returnArray; - } - return result; - } - } -} |