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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,203 @@ | ||
| #nullable enable | ||
| namespace System; | ||
|
|
||
| /// <summary> | ||
| /// The LikeOperator class is used to compare two strings using the * and ? wildcards. | ||
| /// </summary> | ||
| public class LikeOperator | ||
| { | ||
| /// <summary> | ||
| /// Compares two strings using the * and ? wildcards. | ||
| /// </summary> | ||
| public static bool LikeString(string? content, string? pattern, bool ignoreCase = true, bool useInvariantCulture = true) | ||
| { | ||
| if (content == null && pattern == null) | ||
| return true; | ||
| if (content == null || pattern == null) | ||
| return false; | ||
|
|
||
| var patternSpan = pattern.AsSpan(); | ||
| var contentSpan = content.AsSpan(); | ||
|
|
||
| return LikeString(contentSpan, patternSpan, ignoreCase, useInvariantCulture); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Compares two spans using the * and ? wildcards. | ||
| /// </summary> | ||
| public static bool LikeString(ReadOnlySpan<char> contentSpan, ReadOnlySpan<char> patternSpan, bool ignoreCase = true, bool useInvariantCulture = true) | ||
| { | ||
| var zeroOrMoreChars = '*'; | ||
| var oneChar = '?'; | ||
|
|
||
| if (patternSpan.Length == 1) | ||
| { | ||
| ref readonly char patternItem = ref patternSpan[0]; | ||
| if (patternItem == zeroOrMoreChars) | ||
| { | ||
| return true; | ||
| } | ||
| } | ||
|
|
||
| if (contentSpan.Length == 1) | ||
| { | ||
| ref readonly var patternItem = ref patternSpan[0]; | ||
| if (patternItem == oneChar) | ||
| { | ||
| return true; | ||
| } | ||
| } | ||
|
|
||
| var zeroOrMorePatternCount = 0; | ||
| var onePatternCount = 0; | ||
| foreach (var @char in patternSpan) | ||
| { | ||
| ref readonly char patternItem = ref @char; | ||
| if (patternItem == zeroOrMoreChars) | ||
| { | ||
| zeroOrMorePatternCount++; | ||
| } | ||
| else if (patternItem == oneChar) | ||
| { | ||
| onePatternCount++; | ||
| } | ||
| } | ||
|
|
||
| if (zeroOrMorePatternCount + onePatternCount == patternSpan.Length) | ||
| { | ||
| if (zeroOrMorePatternCount > 0) | ||
| { | ||
| return true; | ||
| } | ||
|
|
||
| if (patternSpan.Length == contentSpan.Length) | ||
| { | ||
| return true; | ||
| } | ||
| } | ||
|
|
||
| EqualsCharDelegate equalsChar; | ||
| if (ignoreCase) | ||
| { | ||
| if (useInvariantCulture) | ||
| { | ||
| equalsChar = EqualsCharInvariantCultureIgnoreCase; | ||
| } | ||
| else | ||
| { | ||
| equalsChar = EqualsCharCurrentCultureIgnoreCase; | ||
| } | ||
| } | ||
| else | ||
| { | ||
| equalsChar = EqualsChar; | ||
| } | ||
|
|
||
| return LikeStringCore(contentSpan, patternSpan, in zeroOrMoreChars, in oneChar, equalsChar); | ||
| } | ||
|
|
||
| private static bool LikeStringCore(ReadOnlySpan<char> contentSpan, ReadOnlySpan<char> patternSpan, in char zeroOrMoreChars, in char oneChar, EqualsCharDelegate equalsChar) | ||
| { | ||
| var contentIndex = 0; | ||
| var patternIndex = 0; | ||
| while (contentIndex < contentSpan.Length && patternIndex < patternSpan.Length) | ||
| { | ||
| ref readonly var patternItem = ref patternSpan[patternIndex]; | ||
| if (patternItem == zeroOrMoreChars) | ||
| { | ||
| while (true) | ||
| { | ||
| if (patternIndex < patternSpan.Length) | ||
| { | ||
| ref readonly char nextPatternItem = ref patternSpan[patternIndex]; | ||
| if (nextPatternItem == zeroOrMoreChars) | ||
| { | ||
| patternIndex++; | ||
| continue; | ||
| } | ||
| } | ||
|
|
||
| break; | ||
| } | ||
|
|
||
| if (patternIndex == patternSpan.Length) | ||
| { | ||
| return true; | ||
| } | ||
|
|
||
| while (contentIndex < contentSpan.Length) | ||
| { | ||
| if (LikeStringCore(contentSpan[contentIndex..], patternSpan[patternIndex..], in zeroOrMoreChars, in oneChar, equalsChar)) | ||
| { | ||
| return true; | ||
| } | ||
|
|
||
| contentIndex++; | ||
| } | ||
|
|
||
| return false; | ||
| } | ||
|
|
||
| if (patternItem == oneChar) | ||
| { | ||
| contentIndex++; | ||
| patternIndex++; | ||
| } | ||
| else | ||
| { | ||
| if (contentIndex >= contentSpan.Length) | ||
| { | ||
| return false; | ||
| } | ||
|
|
||
| ref readonly var contentItem = ref contentSpan[contentIndex]; | ||
| if (!equalsChar(in contentItem, in patternItem)) | ||
| { | ||
| return false; | ||
| } | ||
|
|
||
| contentIndex++; | ||
| patternIndex++; | ||
| } | ||
| } | ||
|
|
||
| if (contentIndex == contentSpan.Length) | ||
| { | ||
| while (true) | ||
| { | ||
| if (patternIndex < patternSpan.Length) | ||
| { | ||
| ref readonly char nextPatternItem = ref patternSpan[patternIndex]; | ||
| if (nextPatternItem == zeroOrMoreChars) | ||
| { | ||
| patternIndex++; | ||
| continue; | ||
| } | ||
| } | ||
|
|
||
| break; | ||
| } | ||
|
|
||
| return patternIndex == patternSpan.Length; | ||
| } | ||
|
|
||
| return false; | ||
| } | ||
|
|
||
| private static bool EqualsChar(in char contentItem, in char patternItem) | ||
| { | ||
| return contentItem == patternItem; | ||
| } | ||
|
|
||
| private static bool EqualsCharCurrentCultureIgnoreCase(in char contentItem, in char patternItem) | ||
| { | ||
| return char.ToUpper(contentItem) == char.ToUpper(patternItem); | ||
| } | ||
|
|
||
| private static bool EqualsCharInvariantCultureIgnoreCase(in char contentItem, in char patternItem) | ||
| { | ||
| return char.ToUpperInvariant(contentItem) == char.ToUpperInvariant(patternItem); | ||
| } | ||
|
|
||
| private delegate bool EqualsCharDelegate(in char contentItem, in char patternItem); | ||
| } |