json_writer.h

//------------------------------------------------------------------------------
/*
    This file is part of rippled: https://github.com/ripple/rippled
    Copyright (c) 2012, 2013 Ripple Labs Inc.
 
    Permission to use, copy, modify, and/or distribute this software for any
    purpose  with  or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.
 
    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================
 
#ifndef RIPPLE_JSON_JSON_WRITER_H_INCLUDED
#define RIPPLE_JSON_JSON_WRITER_H_INCLUDED
 
#include <xrpl/json/json_forwards.h>
#include <xrpl/json/json_value.h>
 
#include <ostream>
#include <vector>
 
namespace Json {
 
class Value;
 
class WriterBase
{
public:
    virtual ~WriterBase()
    {
    }
    virtual std::string
    write(Value const& root) = 0;
};
 
class FastWriter : public WriterBase
{
public:
    FastWriter() = default;
    virtual ~FastWriter()
    {
    }
 
public:  // overridden from Writer
    std::string
    write(Value const& root) override;
 
private:
    void
    writeValue(Value const& value);
 
    std::string document_;
};
 
class StyledWriter : public WriterBase
{
public:
    StyledWriter();
    virtual ~StyledWriter()
    {
    }
 
public:  // overridden from Writer
    std::string
    write(Value const& root) override;
 
private:
    void
    writeValue(Value const& value);
    void
    writeArrayValue(Value const& value);
    bool
    isMultineArray(Value const& value);
    void
    pushValue(std::string const& value);
    void
    writeIndent();
    void
    writeWithIndent(std::string const& value);
    void
    indent();
    void
    unindent();
 
    using ChildValues = std::vector<std::string>;
 
    ChildValues childValues_;
    std::string document_;
    std::string indentString_;
    int rightMargin_;
    int indentSize_;
    bool addChildValues_;
};
 
class StyledStreamWriter
{
public:
    StyledStreamWriter(std::string indentation = "\t");
    ~StyledStreamWriter()
    {
    }
 
public:
    void
    write(std::ostream& out, Value const& root);
 
private:
    void
    writeValue(Value const& value);
    void
    writeArrayValue(Value const& value);
    bool
    isMultineArray(Value const& value);
    void
    pushValue(std::string const& value);
    void
    writeIndent();
    void
    writeWithIndent(std::string const& value);
    void
    indent();
    void
    unindent();
 
    using ChildValues = std::vector<std::string>;
 
    ChildValues childValues_;
    std::ostream* document_;
    std::string indentString_;
    int rightMargin_;
    std::string indentation_;
    bool addChildValues_;
};
 
std::string
valueToString(Int value);
std::string
valueToString(UInt value);
std::string
valueToString(double value);
std::string
valueToString(bool value);
std::string
valueToQuotedString(char const* value);
 
std::ostream&
operator<<(std::ostream&, Value const& root);
 
//------------------------------------------------------------------------------
 
// Helpers for stream
namespace detail {
 
template <class Write>
void
write_string(Write const& write, std::string const& s)
{
    write(s.data(), s.size());
}
 
template <class Write>
void
write_value(Write const& write, Value const& value)
{
    switch (value.type())
    {
        case nullValue:
            write("null", 4);
            break;
 
        case intValue:
            write_string(write, valueToString(value.asInt()));
            break;
 
        case uintValue:
            write_string(write, valueToString(value.asUInt()));
            break;
 
        case realValue:
            write_string(write, valueToString(value.asDouble()));
            break;
 
        case stringValue:
            write_string(write, valueToQuotedString(value.asCString()));
            break;
 
        case booleanValue:
            write_string(write, valueToString(value.asBool()));
            break;
 
        case arrayValue: {
            write("[", 1);
            int const size = value.size();
            for (int index = 0; index < size; ++index)
            {
                if (index > 0)
                    write(",", 1);
                write_value(write, value[index]);
            }
            write("]", 1);
            break;
        }
 
        case objectValue: {
            Value::Members const members = value.getMemberNames();
            write("{", 1);
            for (auto it = members.begin(); it != members.end(); ++it)
            {
                std::string const& name = *it;
                if (it != members.begin())
                    write(",", 1);
 
                write_string(write, valueToQuotedString(name.c_str()));
                write(":", 1);
                write_value(write, value[name]);
            }
            write("}", 1);
            break;
        }
    }
}
 
}  // namespace detail
 
template <class Write>
void
stream(Json::Value const& jv, Write const& write)
{
    detail::write_value(write, jv);
    write("\n", 1);
}
 
class Compact
{
    Json::Value jv_;
 
public:
    Compact(Json::Value&& jv) : jv_{std::move(jv)}
    {
    }
 
    friend std::ostream&
    operator<<(std::ostream& o, Compact const& cJv)
    {
        detail::write_value(
            [&o](void const* data, std::size_t n) {
                o.write(static_cast<char const*>(data), n);
            },
            cJv.jv_);
        return o;
    }
};
 
}  // namespace Json
 
#endif  // JSON_WRITER_H_INCLUDED