ficdown/Ficdown.Parser/Engine/RegexLib.cs

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C#
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namespace Ficdown.Parser.Engine
{
using System.Text;
using System.Text.RegularExpressions;
internal static class RegexLib
{
public static Regex Anchors =
new Regex(
string.Format(@"(?<anchor>\[(?<text>{0})\]\([ ]*(?<href>{1})[ ]*\))", GetNestedBracketsPattern(),
GetNestedParensPattern()), RegexOptions.Singleline | RegexOptions.Compiled);
public static Regex Href = new Regex(@"^(\?(?<conditions>[^#]+))?(#(?<toggles>.+))?$", RegexOptions.Compiled);
private const int _nestDepth = 6;
private static string RepeatString(string text, int count)
{
var sb = new StringBuilder(text.Length * count);
for (int i = 0; i < count; i++)
sb.Append(text);
return sb.ToString();
}
private static string _nestedBracketsPattern;
private static string GetNestedBracketsPattern()
{
if (_nestedBracketsPattern == null)
_nestedBracketsPattern =
RepeatString(@"(?>[^\[\]]+|\[", _nestDepth) + RepeatString(@"\])*", _nestDepth);
return _nestedBracketsPattern;
}
private static string _nestedParensPattern;
private static string GetNestedParensPattern()
{
if (_nestedParensPattern == null)
_nestedParensPattern =
RepeatString(@"(?>[^()\s]+|\(", _nestDepth) + RepeatString(@"\))*", _nestDepth);
return _nestedParensPattern;
}
}
}