TokenStream.cpp

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// ------------------------------------------------------------------------
// $RCSfile: TokenStream.cpp,v $
// ------------------------------------------------------------------------
// $Revision: 1.1.1.1 $
// ------------------------------------------------------------------------
// Copyright: see Copyright.readme
// ------------------------------------------------------------------------
//
// Class: TokenStream
//   Abstract base class for input token streams.
//
// ------------------------------------------------------------------------
// Class category: Parser
// ------------------------------------------------------------------------
//
// $Date: 2000/03/27 09:32:37 $
// $Author: fci $
//
// ------------------------------------------------------------------------
 
#include "OpalParser/TokenStream.h"
#include <cctype>
#include "Utilities/LogicalError.h"
 
// Class TokenStream
// ------------------------------------------------------------------------
 
TokenStream::TokenStream(const std::string& name)
    : stream_name(name), curr_line(0), put_back_flag(false), put_back() {}
 
TokenStream::~TokenStream() {}
 
void TokenStream::putBack(const Token& token) {
    if (put_back_flag) {
        throw LogicalError("TokenStream::pushBack()", "Cannot push back two tokens.");
    }
 
    put_back      = token;
    put_back_flag = true;
}
 
int TokenStream::getLine() const { return curr_line; }
 
const std::string& TokenStream::getName() const { return stream_name; }