70 lines
1.9 KiB
C#
70 lines
1.9 KiB
C#
using System.Text.RegularExpressions;
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using BenchmarkDotNet.Running;
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using E015_RegexVsCustomAttributeParser;
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Regex regex = new(@"^\[[A-Z_][A-Z0-9_]+(\(([0-9]+)\))?\]$", RegexOptions.Compiled | RegexOptions.IgnoreCase);
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Console.WriteLine(UsingRegex("[UseResources]"));
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Console.WriteLine(UsingRegex("[UseResources(42)]"));
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Console.WriteLine(UsingRegex("[UseResources(420)]"));
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Console.WriteLine(UsingRegex("[UseResources(4200)]"));
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Console.WriteLine(UsingCustomParser("[UseResources]"));
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Console.WriteLine(UsingCustomParser("[UseResources(42)]"));
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Console.WriteLine(UsingCustomParser("[UseResources(420)]"));
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Console.WriteLine(UsingCustomParser("[UseResources(4200)]"));
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BenchmarkRunner.Run<RegexVsCustomAttributeParser>();
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return;
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int UsingRegex(string input)
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{
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Match match = regex.Match(input);
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if (!match.Success) return 0;
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if (match.Groups.Count < 3) return 0;
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Group argumentsGroup = match.Groups[1];
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Group firstArgumentGroup = match.Groups[2];
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if (!argumentsGroup.Success || !firstArgumentGroup.Success) return 0;
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return int.TryParse(firstArgumentGroup.ValueSpan, out int result) ? result : 0;
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}
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static int UsingCustomParser(string input)
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{
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ReadOnlySpan<char> span = input.AsSpan();
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if (span[0] != '[' || span[^1] != ']') return 0;
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var argumentList = false;
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var result = 0;
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for (var index = 1; index < span.Length - 1; index++)
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{
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char current = span[index];
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if (current == '(')
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{
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if (argumentList) return 0;
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argumentList = true;
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continue;
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}
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if (current == ')')
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{
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if (!argumentList) return 0;
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argumentList = false;
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continue;
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}
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if (argumentList)
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{
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if (current is < '0' or > '9') return 0;
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int numericValue = current - '0';
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result = result * 10 + numericValue;
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}
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}
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return result;
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}
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