forked from jasder/antlr
726 lines
22 KiB
C#
726 lines
22 KiB
C#
/*
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* [The "BSD license"]
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* Copyright (c) 2013 Terence Parr
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* Copyright (c) 2013 Sam Harwell
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Collections.Generic;
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using System.Text;
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using Antlr4.Runtime;
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using Antlr4.Runtime.Misc;
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using Antlr4.Runtime.Sharpen;
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namespace Antlr4.Runtime
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{
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/// <summary>
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/// This implementation of
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/// <see cref="ITokenStream"/>
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/// loads tokens from a
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/// <see cref="ITokenSource"/>
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/// on-demand, and places the tokens in a buffer to provide
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/// access to any previous token by index.
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/// <p>
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/// This token stream ignores the value of
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/// <see cref="IToken.Channel()"/>
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/// . If your
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/// parser requires the token stream filter tokens to only those on a particular
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/// channel, such as
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/// <see cref="TokenConstants.DefaultChannel"/>
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/// or
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/// <see cref="TokenConstants.HiddenChannel"/>
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/// , use a filtering token stream such a
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/// <see cref="CommonTokenStream"/>
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/// .</p>
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/// </summary>
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public class BufferedTokenStream : ITokenStream
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{
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/// <summary>
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/// The
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/// <see cref="ITokenSource"/>
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/// from which tokens for this stream are fetched.
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/// </summary>
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[NotNull]
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protected internal ITokenSource tokenSource;
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/// <summary>A collection of all tokens fetched from the token source.</summary>
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/// <remarks>
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/// A collection of all tokens fetched from the token source. The list is
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/// considered a complete view of the input once
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/// <see cref="fetchedEOF"/>
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/// is set
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/// to
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/// <see langword="true"/>
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/// .
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/// </remarks>
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protected internal IList<IToken> tokens = new List<IToken>(100);
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/// <summary>
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/// The index into
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/// <see cref="tokens"/>
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/// of the current token (next token to
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/// <see cref="Consume()"/>
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/// ).
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/// <see cref="tokens"/>
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/// <c>[</c>
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/// <see cref="p"/>
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/// <c>]</c>
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/// should be
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/// <see cref="Lt(int)">LT(1)</see>
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/// .
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/// <p>This field is set to -1 when the stream is first constructed or when
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/// <see cref="SetTokenSource(ITokenSource)"/>
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/// is called, indicating that the first token has
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/// not yet been fetched from the token source. For additional information,
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/// see the documentation of
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/// <see cref="IIntStream"/>
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/// for a description of
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/// Initializing Methods.</p>
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/// </summary>
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protected internal int p = -1;
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/// <summary>
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/// Indicates whether the
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/// <see cref="TokenConstants.Eof"/>
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/// token has been fetched from
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/// <see cref="tokenSource"/>
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/// and added to
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/// <see cref="tokens"/>
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/// . This field improves
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/// performance for the following cases:
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/// <ul>
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/// <li>
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/// <see cref="Consume()"/>
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/// : The lookahead check in
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/// <see cref="Consume()"/>
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/// to prevent
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/// consuming the EOF symbol is optimized by checking the values of
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/// <see cref="fetchedEOF"/>
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/// and
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/// <see cref="p"/>
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/// instead of calling
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/// <see cref="La(int)"/>
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/// .</li>
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/// <li>
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/// <see cref="Fetch(int)"/>
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/// : The check to prevent adding multiple EOF symbols into
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/// <see cref="tokens"/>
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/// is trivial with this field.</li>
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/// </ul>
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/// </summary>
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protected internal bool fetchedEOF;
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public BufferedTokenStream(ITokenSource tokenSource)
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{
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if (tokenSource == null)
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{
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throw new ArgumentNullException("tokenSource cannot be null");
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}
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this.tokenSource = tokenSource;
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}
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public virtual ITokenSource TokenSource
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{
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get
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{
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return tokenSource;
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}
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}
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public virtual int Index
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{
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get
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{
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return p;
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}
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}
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public virtual int Mark()
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{
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return 0;
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}
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public virtual void Release(int marker)
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{
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}
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// no resources to release
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public virtual void Reset()
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{
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Seek(0);
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}
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public virtual void Seek(int index)
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{
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LazyInit();
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p = AdjustSeekIndex(index);
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}
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public virtual int Size
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{
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get
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{
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return tokens.Count;
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}
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}
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public virtual void Consume()
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{
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bool skipEofCheck;
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if (p >= 0)
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{
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if (fetchedEOF)
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{
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// the last token in tokens is EOF. skip check if p indexes any
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// fetched token except the last.
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skipEofCheck = p < tokens.Count - 1;
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}
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else
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{
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// no EOF token in tokens. skip check if p indexes a fetched token.
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skipEofCheck = p < tokens.Count;
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}
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}
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else
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{
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// not yet initialized
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skipEofCheck = false;
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}
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if (!skipEofCheck && La(1) == IntStreamConstants.Eof)
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{
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throw new InvalidOperationException("cannot consume EOF");
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}
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if (Sync(p + 1))
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{
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p = AdjustSeekIndex(p + 1);
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}
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}
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/// <summary>
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/// Make sure index
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/// <paramref name="i"/>
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/// in tokens has a token.
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/// </summary>
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/// <returns>
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///
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/// <see langword="true"/>
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/// if a token is located at index
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/// <paramref name="i"/>
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/// , otherwise
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/// <see langword="false"/>
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/// .
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/// </returns>
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/// <seealso cref="Get(int)"/>
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protected internal virtual bool Sync(int i)
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{
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System.Diagnostics.Debug.Assert(i >= 0);
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int n = i - tokens.Count + 1;
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// how many more elements we need?
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//System.out.println("sync("+i+") needs "+n);
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if (n > 0)
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{
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int fetched = Fetch(n);
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return fetched >= n;
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}
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return true;
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}
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/// <summary>
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/// Add
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/// <paramref name="n"/>
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/// elements to buffer.
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/// </summary>
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/// <returns>The actual number of elements added to the buffer.</returns>
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protected internal virtual int Fetch(int n)
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{
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if (fetchedEOF)
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{
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return 0;
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}
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for (int i = 0; i < n; i++)
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{
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IToken t = tokenSource.NextToken();
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if (t is IWritableToken)
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{
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((IWritableToken)t).TokenIndex = tokens.Count;
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}
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tokens.Add(t);
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if (t.Type == TokenConstants.Eof)
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{
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fetchedEOF = true;
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return i + 1;
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}
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}
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return n;
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}
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public virtual IToken Get(int i)
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{
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if (i < 0 || i >= tokens.Count)
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{
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throw new ArgumentOutOfRangeException("token index " + i + " out of range 0.." + (tokens.Count - 1));
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}
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return tokens[i];
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}
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/// <summary>Get all tokens from start..stop inclusively.</summary>
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/// <remarks>Get all tokens from start..stop inclusively.</remarks>
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public virtual IList<IToken> Get(int start, int stop)
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{
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if (start < 0 || stop < 0)
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{
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return null;
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}
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LazyInit();
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IList<IToken> subset = new List<IToken>();
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if (stop >= tokens.Count)
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{
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stop = tokens.Count - 1;
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}
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for (int i = start; i <= stop; i++)
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{
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IToken t = tokens[i];
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if (t.Type == TokenConstants.Eof)
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{
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break;
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}
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subset.Add(t);
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}
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return subset;
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}
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public virtual int La(int i)
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{
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return Lt(i).Type;
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}
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protected internal virtual IToken Lb(int k)
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{
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if ((p - k) < 0)
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{
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return null;
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}
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return tokens[p - k];
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}
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[return: NotNull]
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public virtual IToken Lt(int k)
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{
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LazyInit();
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if (k == 0)
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{
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return null;
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}
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if (k < 0)
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{
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return Lb(-k);
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}
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int i = p + k - 1;
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Sync(i);
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if (i >= tokens.Count)
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{
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// return EOF token
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// EOF must be last token
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return tokens[tokens.Count - 1];
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}
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// if ( i>range ) range = i;
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return tokens[i];
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}
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/// <summary>
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/// Allowed derived classes to modify the behavior of operations which change
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/// the current stream position by adjusting the target token index of a seek
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/// operation.
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/// </summary>
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/// <remarks>
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/// Allowed derived classes to modify the behavior of operations which change
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/// the current stream position by adjusting the target token index of a seek
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/// operation. The default implementation simply returns
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/// <paramref name="i"/>
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/// . If an
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/// exception is thrown in this method, the current stream index should not be
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/// changed.
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/// <p>For example,
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/// <see cref="CommonTokenStream"/>
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/// overrides this method to ensure that
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/// the seek target is always an on-channel token.</p>
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/// </remarks>
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/// <param name="i">The target token index.</param>
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/// <returns>The adjusted target token index.</returns>
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protected internal virtual int AdjustSeekIndex(int i)
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{
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return i;
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}
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protected internal void LazyInit()
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{
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if (p == -1)
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{
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Setup();
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}
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}
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protected internal virtual void Setup()
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{
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Sync(0);
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p = AdjustSeekIndex(0);
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}
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/// <summary>Reset this token stream by setting its token source.</summary>
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/// <remarks>Reset this token stream by setting its token source.</remarks>
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public virtual void SetTokenSource(ITokenSource tokenSource)
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{
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this.tokenSource = tokenSource;
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tokens.Clear();
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p = -1;
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}
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public virtual IList<IToken> GetTokens()
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{
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return tokens;
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}
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public virtual IList<IToken> GetTokens(int start, int stop)
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{
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return GetTokens(start, stop, null);
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}
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/// <summary>
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/// Given a start and stop index, return a
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/// <c>List</c>
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/// of all tokens in
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/// the token type
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/// <c>BitSet</c>
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/// . Return
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/// <see langword="null"/>
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/// if no tokens were found. This
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/// method looks at both on and off channel tokens.
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/// </summary>
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public virtual IList<IToken> GetTokens(int start, int stop, BitSet types)
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{
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LazyInit();
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if (start < 0 || stop >= tokens.Count || stop < 0 || start >= tokens.Count)
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{
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throw new ArgumentOutOfRangeException("start " + start + " or stop " + stop + " not in 0.." + (tokens.Count - 1));
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}
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if (start > stop)
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{
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return null;
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}
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// list = tokens[start:stop]:{T t, t.getType() in types}
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IList<IToken> filteredTokens = new List<IToken>();
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for (int i = start; i <= stop; i++)
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{
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IToken t = tokens[i];
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if (types == null || types.Get(t.Type))
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{
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filteredTokens.Add(t);
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}
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}
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if (filteredTokens.Count == 0)
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{
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filteredTokens = null;
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}
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return filteredTokens;
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}
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public virtual IList<IToken> GetTokens(int start, int stop, int ttype)
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{
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BitSet s = new BitSet(ttype);
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s.Set(ttype);
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return GetTokens(start, stop, s);
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}
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/// <summary>Given a starting index, return the index of the next token on channel.</summary>
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/// <remarks>
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/// Given a starting index, return the index of the next token on channel.
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/// Return
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/// <paramref name="i"/>
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/// if
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/// <c>tokens[i]</c>
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/// is on channel. Return the index of
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/// the EOF token if there are no tokens on channel between
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/// <paramref name="i"/>
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/// and
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/// EOF.
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/// </remarks>
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protected internal virtual int NextTokenOnChannel(int i, int channel)
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{
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Sync(i);
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if (i >= Size)
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{
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return Size - 1;
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}
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IToken token = tokens[i];
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while (token.Channel != channel)
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{
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if (token.Type == TokenConstants.Eof)
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{
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return i;
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}
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i++;
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Sync(i);
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token = tokens[i];
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}
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return i;
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}
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/// <summary>
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/// Given a starting index, return the index of the previous token on
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/// channel.
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/// </summary>
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/// <remarks>
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/// Given a starting index, return the index of the previous token on
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/// channel. Return
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/// <paramref name="i"/>
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/// if
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/// <c>tokens[i]</c>
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/// is on channel. Return -1
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/// if there are no tokens on channel between
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/// <paramref name="i"/>
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/// and 0.
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/// <p>
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/// If
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/// <paramref name="i"/>
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/// specifies an index at or after the EOF token, the EOF token
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/// index is returned. This is due to the fact that the EOF token is treated
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/// as though it were on every channel.</p>
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/// </remarks>
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protected internal virtual int PreviousTokenOnChannel(int i, int channel)
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{
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Sync(i);
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if (i >= Size)
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{
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// the EOF token is on every channel
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return Size - 1;
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}
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while (i >= 0)
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{
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IToken token = tokens[i];
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if (token.Type == TokenConstants.Eof || token.Channel == channel)
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{
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return i;
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}
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i--;
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}
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return i;
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}
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/// <summary>
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/// Collect all tokens on specified channel to the right of
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/// the current token up until we see a token on
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/// <see cref="Lexer.DefaultTokenChannel"/>
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/// or
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/// EOF. If
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/// <paramref name="channel"/>
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/// is
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/// <c>-1</c>
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/// , find any non default channel token.
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/// </summary>
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public virtual IList<IToken> GetHiddenTokensToRight(int tokenIndex, int channel)
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{
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LazyInit();
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if (tokenIndex < 0 || tokenIndex >= tokens.Count)
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{
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throw new ArgumentOutOfRangeException(tokenIndex + " not in 0.." + (tokens.Count - 1));
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}
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int nextOnChannel = NextTokenOnChannel(tokenIndex + 1, Lexer.DefaultTokenChannel);
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int to;
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int from = tokenIndex + 1;
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// if none onchannel to right, nextOnChannel=-1 so set to = last token
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if (nextOnChannel == -1)
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{
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to = Size - 1;
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}
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else
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{
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to = nextOnChannel;
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}
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return FilterForChannel(from, to, channel);
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}
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/// <summary>
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/// Collect all hidden tokens (any off-default channel) to the right of
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/// the current token up until we see a token on
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/// <see cref="Lexer.DefaultTokenChannel"/>
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/// or EOF.
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/// </summary>
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public virtual IList<IToken> GetHiddenTokensToRight(int tokenIndex)
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{
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return GetHiddenTokensToRight(tokenIndex, -1);
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}
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/// <summary>
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/// Collect all tokens on specified channel to the left of
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/// the current token up until we see a token on
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/// <see cref="Lexer.DefaultTokenChannel"/>
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/// .
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/// If
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/// <paramref name="channel"/>
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/// is
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/// <c>-1</c>
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/// , find any non default channel token.
|
|
/// </summary>
|
|
public virtual IList<IToken> GetHiddenTokensToLeft(int tokenIndex, int channel)
|
|
{
|
|
LazyInit();
|
|
if (tokenIndex < 0 || tokenIndex >= tokens.Count)
|
|
{
|
|
throw new ArgumentOutOfRangeException(tokenIndex + " not in 0.." + (tokens.Count - 1));
|
|
}
|
|
if (tokenIndex == 0)
|
|
{
|
|
// obviously no tokens can appear before the first token
|
|
return null;
|
|
}
|
|
int prevOnChannel = PreviousTokenOnChannel(tokenIndex - 1, Lexer.DefaultTokenChannel);
|
|
if (prevOnChannel == tokenIndex - 1)
|
|
{
|
|
return null;
|
|
}
|
|
// if none onchannel to left, prevOnChannel=-1 then from=0
|
|
int from = prevOnChannel + 1;
|
|
int to = tokenIndex - 1;
|
|
return FilterForChannel(from, to, channel);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Collect all hidden tokens (any off-default channel) to the left of
|
|
/// the current token up until we see a token on
|
|
/// <see cref="Lexer.DefaultTokenChannel"/>
|
|
/// .
|
|
/// </summary>
|
|
public virtual IList<IToken> GetHiddenTokensToLeft(int tokenIndex)
|
|
{
|
|
return GetHiddenTokensToLeft(tokenIndex, -1);
|
|
}
|
|
|
|
protected internal virtual IList<IToken> FilterForChannel(int from, int to, int channel)
|
|
{
|
|
IList<IToken> hidden = new List<IToken>();
|
|
for (int i = from; i <= to; i++)
|
|
{
|
|
IToken t = tokens[i];
|
|
if (channel == -1)
|
|
{
|
|
if (t.Channel != Lexer.DefaultTokenChannel)
|
|
{
|
|
hidden.Add(t);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (t.Channel == channel)
|
|
{
|
|
hidden.Add(t);
|
|
}
|
|
}
|
|
}
|
|
if (hidden.Count == 0)
|
|
{
|
|
return null;
|
|
}
|
|
return hidden;
|
|
}
|
|
|
|
public virtual string SourceName
|
|
{
|
|
get
|
|
{
|
|
return tokenSource.SourceName;
|
|
}
|
|
}
|
|
|
|
/// <summary>Get the text of all tokens in this buffer.</summary>
|
|
/// <remarks>Get the text of all tokens in this buffer.</remarks>
|
|
[return: NotNull]
|
|
public virtual string GetText()
|
|
{
|
|
Fill();
|
|
return GetText(Interval.Of(0, Size - 1));
|
|
}
|
|
|
|
[return: NotNull]
|
|
public virtual string GetText(Interval interval)
|
|
{
|
|
int start = interval.a;
|
|
int stop = interval.b;
|
|
if (start < 0 || stop < 0)
|
|
{
|
|
return string.Empty;
|
|
}
|
|
LazyInit();
|
|
if (stop >= tokens.Count)
|
|
{
|
|
stop = tokens.Count - 1;
|
|
}
|
|
StringBuilder buf = new StringBuilder();
|
|
for (int i = start; i <= stop; i++)
|
|
{
|
|
IToken t = tokens[i];
|
|
if (t.Type == TokenConstants.Eof)
|
|
{
|
|
break;
|
|
}
|
|
buf.Append(t.Text);
|
|
}
|
|
return buf.ToString();
|
|
}
|
|
|
|
[return: NotNull]
|
|
public virtual string GetText(RuleContext ctx)
|
|
{
|
|
return GetText(ctx.SourceInterval);
|
|
}
|
|
|
|
[return: NotNull]
|
|
public virtual string GetText(IToken start, IToken stop)
|
|
{
|
|
if (start != null && stop != null)
|
|
{
|
|
return GetText(Interval.Of(start.TokenIndex, stop.TokenIndex));
|
|
}
|
|
return string.Empty;
|
|
}
|
|
|
|
/// <summary>Get all tokens from lexer until EOF.</summary>
|
|
/// <remarks>Get all tokens from lexer until EOF.</remarks>
|
|
public virtual void Fill()
|
|
{
|
|
LazyInit();
|
|
int blockSize = 1000;
|
|
while (true)
|
|
{
|
|
int fetched = Fetch(blockSize);
|
|
if (fetched < blockSize)
|
|
{
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|