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#pragma once 
 
#include <util/stream/output.h> 
 
#include <utility>
#include <util/generic/strbuf.h> 
 
template <class T> 
struct TDumper { 
    template <class S> 
    static inline void Dump(S& s, const T& t) { 
        s.Stream() << t; 
    } 
}; 
 
namespace NDumpPrivate { 
    template <class T, class V> 
    inline void Dump(T& t, const V& v) { 
        ::TDumper<V>::Dump(t, v); 
    } 
 
    template <class T, class V> 
    inline T&& operator<<(T&& t, V&& v) { 
        Dump(t, v); 
 
        return std::forward<T>(t);
    } 
 
    struct TADLBase { 
    }; 
} 
 
struct TDumpBase: public ::NDumpPrivate::TADLBase { 
    inline TDumpBase(IOutputStream& out, bool indent) noexcept
        : Out(&out) 
        , IndentLevel(0) 
        , Indent(indent) 
    { 
    } 
 
    inline IOutputStream& Stream() const noexcept {
        return *Out; 
    } 
 
    void Char(char ch); 
    void Char(wchar16 ch); 
 
    void String(const TStringBuf& s); 
    void String(const TWtringBuf& s); 
 
    void Raw(const TStringBuf& s); 
 
    IOutputStream* Out;
    size_t IndentLevel; 
    bool Indent; 
}; 
 
struct TIndentScope { 
    inline TIndentScope(TDumpBase& d) 
        : D(&d) 
    { 
        ++(D->IndentLevel); 
    } 
 
    inline ~TIndentScope() {
        --(D->IndentLevel); 
    } 
 
    TDumpBase* D; 
}; 
 
template <class TChar> 
struct TRawLiteral { 
    const TBasicStringBuf<TChar> S;
}; 
 
template <class TChar> 
static inline TRawLiteral<TChar> DumpRaw(const TBasicStringBuf<TChar>& s) noexcept {
    return {s};
}

template <class TChar>
static inline TRawLiteral<TChar> DumpRaw(const TChar* s) noexcept {
    return {s}; 
} 
 
template <class C> 
struct TDumper<TRawLiteral<C>> { 
    template <class S> 
    static inline void Dump(S& s, const TRawLiteral<C>& v) { 
        s.Raw(v.S); 
    } 
}; 
 
struct TIndentNewLine { 
}; 
 
static inline TIndentNewLine IndentNewLine() noexcept {
    return {}; 
} 
 
template <> 
struct TDumper<TIndentNewLine> { 
    template <class S> 
    static inline void Dump(S& s, const TIndentNewLine&) { 
        if (s.Indent) { 
            s << DumpRaw("\n") << DumpRaw(TString(s.IndentLevel * 4, ' ').data());
        } 
    } 
}; 
 
template <class P> 
struct TDumper<const P*> { 
    template <class S> 
    static inline void Dump(S& s, const P* p) { 
        s.Pointer(p); 
    } 
}; 
 
template <class P> 
struct TDumper<P*>: public TDumper<const P*> { 
}; 
 
struct TCharDumper { 
    template <class S, class V> 
    static inline void Dump(S& s, const V& v) { 
        s.Char(v); 
    } 
}; 
 
template <class S, class V> 
static inline void OutSequence(S& s, const V& v, const char* openTag, const char* closeTag) { 
    s.ColorScheme.Markup(s);
    s << DumpRaw(openTag); 
 
    { 
        TIndentScope scope(s); 
        size_t cnt = 0; 
 
        for (const auto& x : v) { 
            if (cnt) { 
                s.ColorScheme.Markup(s);
                s << DumpRaw(", "); 
            } 
 
            s << IndentNewLine();
            s.ColorScheme.Literal(s);
            s << x;
            ++cnt; 
        } 
    } 
 
    s << IndentNewLine();
    s.ColorScheme.Markup(s);
    s << DumpRaw(closeTag);
    s.ColorScheme.ResetType(s);
} 
 
struct TAssocDumper { 
    template <class S, class V> 
    static inline void Dump(S& s, const V& v) { 
        ::OutSequence(s, v, "{", "}"); 
    } 
}; 
 
struct TSeqDumper { 
    template <class S, class V> 
    static inline void Dump(S& s, const V& v) { 
        ::OutSequence(s, v, "[", "]"); 
    } 
}; 
 
struct TStrDumper { 
    template <class S, class V> 
    static inline void Dump(S& s, const V& v) { 
        s.ColorScheme.String(s);
        s.String(v); 
        s.ColorScheme.ResetType(s);
    } 
};