/usr/include/classad/lexerSource.h is in libclassad-dev 8.6.8~dfsg.1-2.
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*
* Copyright (C) 1990-2007, Condor Team, Computer Sciences Department,
* University of Wisconsin-Madison, WI.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you
* may not use this file except in compliance with the License. You may
* obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
***************************************************************/
#ifndef __CLASSAD_LEXER_SOURCE_H__
#define __CLASSAD_LEXER_SOURCE_H__
#include "classad/common.h"
namespace classad {
/*
* LexerSource is a class that provides an abstract interface to the
* lexer. The lexer reads tokens and gives them to the parser. The
* lexer reads single characters from a LexerSource. Because we want
* to read characters from different types of sources (files, strings,
* etc.) without burdening the lexer, the lexer uses this LexerSource
* abstract class. There are several implementations of the
* LexerSource that provide access to specific types of sources.
*
*/
class LexerSource
{
public:
LexerSource()
{
return;
}
virtual ~LexerSource()
{
return;
}
// Reads a single character from the source
virtual int ReadCharacter(void) = 0;
// Returns the last character read (from ReadCharacter()) from the
// source
virtual int ReadPreviousCharacter(void) { return _previous_character; };
// Puts back a character so that when ReadCharacter is called
// again, it returns the character that was previously
// read. Although this interface appears to require the ability to
// put back an arbitrary number of characters, in practice we only
// ever put back a single character.
virtual void UnreadCharacter(void) = 0;
virtual bool AtEnd(void) const = 0;
protected:
int _previous_character;
private:
// The copy constructor and assignment operator are defined
// to be private so we don't have to write them, or worry about
// them being inappropriately used. The day we want them, we can
// write them.
LexerSource(const LexerSource &) { return; }
LexerSource &operator=(const LexerSource &) { return *this; }
};
// This source allows input from a traditional C FILE *
class FileLexerSource : public LexerSource
{
public:
FileLexerSource(FILE *file);
virtual ~FileLexerSource();
virtual void SetNewSource(FILE *file);
virtual int ReadCharacter(void);
virtual void UnreadCharacter(void);
virtual bool AtEnd(void) const;
private:
FILE *_file;
FileLexerSource(const FileLexerSource &) : LexerSource() { return; }
FileLexerSource &operator=(const FileLexerSource &) { return *this; }
};
// This source allows input from a traditional C string.
class CharLexerSource : public LexerSource
{
public:
CharLexerSource(const char *string, int offset=0);
virtual ~CharLexerSource();
virtual void SetNewSource(const char *string, int offset=0);
virtual int ReadCharacter(void);
virtual void UnreadCharacter(void);
virtual bool AtEnd(void) const;
virtual int GetCurrentLocation(void) const;
private:
const char *_string;
int _offset;
CharLexerSource(const CharLexerSource &) : LexerSource() { return; }
CharLexerSource &operator=(const CharLexerSource &) { return *this; }
};
// This source allows input from a C++ string.
class StringLexerSource : public LexerSource
{
public:
StringLexerSource(const std::string *string, int offset=0);
virtual ~StringLexerSource();
virtual void SetNewSource(const std::string *string, int offset=0);
virtual int ReadCharacter(void);
virtual void UnreadCharacter(void);
virtual bool AtEnd(void) const;
virtual int GetCurrentLocation(void) const;
private:
const std::string *_string;
int _offset;
StringLexerSource(const StringLexerSource &) : LexerSource() { return; }
StringLexerSource &operator=(const StringLexerSource &) { return *this; }
};
}
#endif /* __CLASSAD_LEXER_SOURCE_H__ */
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