ObjectsSet.h

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#pragma once
 
#include <alib/set>
#include <core/stringApi.hpp>
 
#include <container/ContainerFromStringLexer.h>
 
namespace core {
 
template<class ValueType >
struct stringApi < ext::set < ValueType > > {
    static ext::set < ValueType > parse ( ext::istream & input );
    static bool first ( ext::istream & input );
    static void compose ( ext::ostream & output, const ext::set < ValueType > & container );
};
 
template<class ValueType >
ext::set < ValueType > stringApi < ext::set < ValueType > >::parse ( ext::istream & input ) {
    container::ContainerFromStringLexer::Token token = container::ContainerFromStringLexer::next ( input );
    if(token.type != container::ContainerFromStringLexer::TokenType::SET_BEGIN)
        throw exception::CommonException("Expected SET_BEGIN token.");
 
    token = container::ContainerFromStringLexer::next ( input );
 
    ext::set<ValueType> objectsSet;
    if(token.type != container::ContainerFromStringLexer::TokenType::SET_END) while(true) {
        container::ContainerFromStringLexer::putback(input, token);
        ValueType innerObject = stringApi < ValueType >::parse ( input );
        objectsSet.insert ( std::move ( innerObject ) );
 
        token = container::ContainerFromStringLexer::next(input);
        if(token.type != container::ContainerFromStringLexer::TokenType::COMMA)
            break;
 
        token = container::ContainerFromStringLexer::next(input);
    }
 
    if(token.type != container::ContainerFromStringLexer::TokenType::SET_END)
        throw exception::CommonException("Expected SET_END token.");
    return objectsSet;
}
 
template<class ValueType >
bool stringApi < ext::set < ValueType > >::first ( ext::istream & input ) {
    container::ContainerFromStringLexer::Token token = container::ContainerFromStringLexer::next ( input );
    bool res = token.type == container::ContainerFromStringLexer::TokenType::SET_BEGIN;
    container::ContainerFromStringLexer::putback ( input, token );
    return res;
}
 
template<class ValueType >
void stringApi < ext::set < ValueType > >::compose ( ext::ostream & output, const ext::set < ValueType > & container ) {
    output << '{';
    bool first = true;
    for(const ValueType & innerObject : container) {
        if(!first)
            output << ", ";
        else
            first = false;
        stringApi < ValueType >::compose ( output, innerObject );
    }
    output << '}';
}
 
} /* namespace core */