70 lines
2.3 KiB
C#
70 lines
2.3 KiB
C#
// -----------------------------------------------------------------------------
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// file="RegexTokenParser"
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// Project: StgSharp
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// Copyright (c) Nitload.
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// SPDX-License-Identifier: MIT
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// -----------------------------------------------------------------------------
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using StgSharp.RegularAnalysis.Abstraction;
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using System;
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using System.Collections.Generic;
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using System.Diagnostics.Tracing;
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using System.IO.Pipes;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace StgSharp.RegularAnalysis.Text
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{
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internal class RegexTokenParser : TokenParser<RegexElementLabel, RegexElementLabel>
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{
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private readonly Queue<Token<RegexElementLabel>> _buffer = [];
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private RegexElementLabel _prev;
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public override bool IsEmpty => Source.IsEmpty && _buffer.Count == 0;
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public override Token<RegexElementLabel> ReadToken()
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{
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if (_buffer.TryDequeue(out Token<RegexElementLabel> token)) {
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return token;
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}
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if (Source.TryReadToken(out Token<RegexElementLabel> orig))
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{
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if (((int)(orig.Flag & RegexElementLabel.ATOM_BEGIN) != 0) && ((int)_prev != 0))
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{
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Token<RegexElementLabel> ret = new Token<RegexElementLabel>(string.Empty,
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orig.Line,
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orig.Column,
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RegexElementLabel.CONCAT);
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_buffer.Enqueue(orig);
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_prev = orig.Flag & RegexElementLabel.ATOM_END;
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return ret;
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} else
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{
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_prev = orig.Flag & RegexElementLabel.ATOM_END;
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return orig;
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}
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} else
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{
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return Token<RegexElementLabel>.Empty;
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}
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}
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public override bool TryReadToken(
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out Token<RegexElementLabel> t
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)
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{
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if (IsEmpty)
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{
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t = Token<RegexElementLabel>.Empty;
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return false;
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}
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t = ReadToken();
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return t != Token<RegexElementLabel>.Empty;
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}
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}
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}
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