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/*
* [The "BSD licence"]
* Copyright (c) 2005-2008 Terence Parr
* All rights reserved.
*
* Conversion to C#:
* Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
namespace Antlr.Runtime
{
/** <summary>
* A source of tokens must provide a sequence of tokens via nextToken()
* and also must reveal it's source of characters; CommonToken's text is
* computed from a CharStream; it only store indices into the char stream.
* </summary>
*
* <remarks>
* Errors from the lexer are never passed to the parser. Either you want
* to keep going or you do not upon token recognition error. If you do not
* want to continue lexing then you do not want to continue parsing. Just
* throw an exception not under RecognitionException and Java will naturally
* toss you all the way out of the recognizers. If you want to continue
* lexing then you should not throw an exception to the parser--it has already
* requested a token. Keep lexing until you get a valid one. Just report
* errors and keep going, looking for a valid token.
* </summary>
*/
public interface ITokenSource
{
/** <summary>
* Return a Token object from your input stream (usually a CharStream).
* Do not fail/return upon lexing error; keep chewing on the characters
* until you get a good one; errors are not passed through to the parser.
* </summary>
*/
IToken NextToken();
/** <summary>
* Where are you getting tokens from? normally the implication will simply
* ask lexers input stream.
* </summary>
*/
string SourceName
{
get;
}
string[] TokenNames
{
get;
}
}
}
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