SymbolOrEpsilon.h

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#pragma once
 
#include <common/symbol_or_epsilon.hpp>
#include <core/stringApi.hpp>
 
namespace core {
 
template < class SymbolType >
struct stringApi < common::symbol_or_epsilon < SymbolType > > {
    static common::symbol_or_epsilon < SymbolType > parse ( ext::istream & input );
    static bool first ( ext::istream & input );
    static void compose ( ext::ostream & output, const common::symbol_or_epsilon < SymbolType > & symbol );
};
 
template < class SymbolType >
common::symbol_or_epsilon < SymbolType > stringApi < common::symbol_or_epsilon < SymbolType > >::parse ( ext::istream & ) {
    throw exception::CommonException("Parsing of symbol or epsilon from string not implemented.");
}
 
template < class SymbolType >
bool stringApi < common::symbol_or_epsilon < SymbolType > >::first ( ext::istream & ) {
    return false;
}
 
template < class SymbolType >
void stringApi < common::symbol_or_epsilon < SymbolType > >::compose ( ext::ostream & output, const common::symbol_or_epsilon < SymbolType > & symbol ) {
    if ( symbol.is_epsilon ( ) )
        output << "#E";
    else
        core::stringApi < SymbolType >::compose ( output, symbol.getSymbol ( ) );
}
 
} /* namespace core */