58 lines
2.3 KiB
C#
58 lines
2.3 KiB
C#
namespace Ficdown.Parser.Engine
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{
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using System.Text;
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using System.Text.RegularExpressions;
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internal static class RegexLib
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{
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public static Regex Anchors =
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new Regex(
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string.Format(@"(?<anchor>\[(?<text>{0})\]\([ ]*(?<href>{1})[ ]*\))", GetNestedBracketsPattern(),
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GetNestedParensPattern()), RegexOptions.Singleline | RegexOptions.Compiled);
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public static Regex ConditionalText = new Regex(@"^(?<true>([^|\\]|\\.)*)(\|(?<false>([^|\\]|\\.)+))?$",
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RegexOptions.Singleline | RegexOptions.Compiled);
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public static Regex EscapeChar = new Regex(@"(?<!\\)\\", RegexOptions.Compiled);
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private const string RegexValidName = @"[a-zA-Z](-?[a-zA-Z0-9])*";
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private static readonly string RegexHrefTarget = string.Format(@"\/({0})", RegexValidName);
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private static readonly string RegexHrefConditions = string.Format(@"\?((!?{0})(&!?{0})*)?", RegexValidName);
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private static readonly string RegexHrefToggles = string.Format(@"#({0})(\+{0})*", RegexValidName);
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public static Regex Href =
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new Regex(
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string.Format(@"^(?<target>{0})?(?<conditions>{1})?(?<toggles>{2})?$", RegexHrefTarget,
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RegexHrefConditions, RegexHrefToggles), RegexOptions.Compiled);
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private const int _nestDepth = 6;
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private static string RepeatString(string text, int count)
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{
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var sb = new StringBuilder(text.Length * count);
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for (int i = 0; i < count; i++)
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sb.Append(text);
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return sb.ToString();
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}
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private static string _nestedBracketsPattern;
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private static string GetNestedBracketsPattern()
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{
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if (_nestedBracketsPattern == null)
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_nestedBracketsPattern =
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RepeatString(@"(?>[^\[\]]+|\[", _nestDepth) + RepeatString(@"\])*", _nestDepth);
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return _nestedBracketsPattern;
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}
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private static string _nestedParensPattern;
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private static string GetNestedParensPattern()
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{
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if (_nestedParensPattern == null)
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_nestedParensPattern =
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RepeatString(@"(?>[^()\s]+|\(", _nestDepth) + RepeatString(@"\))*", _nestDepth);
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return _nestedParensPattern;
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}
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}
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}
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