markdig/src/Markdig.Benchmarks/TestMatchPerf.cs

// Copyright (c) Alexandre Mutel. All rights reserved.
// This file is licensed under the BSD-Clause 2 license. 
// See the license.txt file in the project root for more information.

using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;

namespace Testamina.Markdig.Benchmarks
{
    public class TextRegexHelper
    {
        private readonly Dictionary<string, string> replacers;
        private readonly Regex regex;

        public TextRegexHelper(Dictionary<string, string> replacers)
        {
            this.replacers = replacers;
            var builder = new StringBuilder();

            // (?<1>:value:?)|(?<1>:noo:?)
            foreach (var replace in replacers)
            {
                var matchStr = Regex.Escape(replace.Key);
                if (builder.Length > 0)
                {
                    builder.Append('|');
                }
                builder.Append("(?<1>").Append(matchStr).Append("?)");
            }

            regex = new Regex(builder.ToString());
        }

        public bool TryMatch(string text, int offset, out string matchText, out string replaceText)
        {
            replaceText = null;
            matchText = null;
            var result = regex.Match(text, offset);
            if (!result.Success)
            {
                return false;
            }

            matchText = result.Groups[1].Value;
            replaceText = replacers[matchText];
            return true;
        }
    }

    /*
    public class TestMatchPerf
    {
        private readonly TextMatchHelper matcher;

        public TestMatchPerf()
        {
            var replacers = new Dictionary<string, string>();
            for (int i = 0; i < 1000; i++)
            {
                replacers.Add($":z{i}:", i.ToString());
            }
            replacers.Add(":abc:", "yes");

            matcher = new TextMatchHelper(new HashSet<string>(replacers.Keys));
        }

        [Benchmark]
        public void TestMatch()
        {

            for (int i = 0; i < 1000; i++)
            {
                string matchText;
                //var text = ":z150: this is a long string";
                var text = ":z1:";
                matcher.TryMatch(text, 0, text.Length, out matchText);
            }
        }
    }
    */
}