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writer.h
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1// Copyright 2007-2010 Baptiste Lepilleur and The JsonCpp Authors
2// Distributed under MIT license, or public domain if desired and
3// recognized in your jurisdiction.
4// See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
5
6#ifndef JSON_WRITER_H_INCLUDED
7#define JSON_WRITER_H_INCLUDED
8
9#if !defined(JSON_IS_AMALGAMATION)
10#include "value.h"
11#endif // if !defined(JSON_IS_AMALGAMATION)
12#include <ostream>
13#include <string>
14#include <vector>
15
16// Disable warning C4251: <data member>: <type> needs to have dll-interface to
17// be used by...
18#if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING) && defined(_MSC_VER)
19#pragma warning(push)
20#pragma warning(disable : 4251)
21#endif // if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING)
22
23#pragma pack(push)
24#pragma pack()
25
26namespace Json {
27
28class Value;
29
43protected:
44 OStream* sout_; // not owned; will not delete
45public:
47 virtual ~StreamWriter();
55 virtual int write(Value const& root, OStream* sout) = 0;
56
60 public:
61 virtual ~Factory();
65 virtual StreamWriter* newStreamWriter() const = 0;
66 }; // Factory
67}; // StreamWriter
68
73 Value const& root);
74
91public:
92 // Note: We use a Json::Value so that we can add data-members to this class
93 // without a major version bump.
123
126
130 StreamWriter* newStreamWriter() const override;
131
135 bool validate(Json::Value* invalid) const;
138 Value& operator[](const String& key);
139
145 static void setDefaults(Json::Value* settings);
146};
147
152public:
153 virtual ~Writer();
154
155 virtual String write(const Value& root) = 0;
156};
157
167#if defined(_MSC_VER)
168#pragma warning(push)
169#pragma warning(disable : 4996) // Deriving from deprecated class
170#endif
171class JSON_API FastWriter : public Writer {
172public:
174 ~FastWriter() override = default;
175
177
184
185 void omitEndingLineFeed();
186
187public: // overridden from Writer
188 String write(const Value& root) override;
189
190private:
191 void writeValue(const Value& value);
192
193 String document_;
194 bool yamlCompatibilityEnabled_{false};
195 bool dropNullPlaceholders_{false};
196 bool omitEndingLineFeed_{false};
197};
198#if defined(_MSC_VER)
199#pragma warning(pop)
200#endif
201
226#if defined(_MSC_VER)
227#pragma warning(push)
228#pragma warning(disable : 4996) // Deriving from deprecated class
229#endif
231public:
233 ~StyledWriter() override = default;
234
235public: // overridden from Writer
240 String write(const Value& root) override;
241
242private:
243 void writeValue(const Value& value);
244 void writeArrayValue(const Value& value);
245 bool isMultilineArray(const Value& value);
246 void pushValue(const String& value);
247 void writeIndent();
248 void writeWithIndent(const String& value);
249 void indent();
250 void unindent();
251 void writeCommentBeforeValue(const Value& root);
252 void writeCommentAfterValueOnSameLine(const Value& root);
253 static bool hasCommentForValue(const Value& value);
254 static String normalizeEOL(const String& text);
255
256 using ChildValues = std::vector<String>;
257
258 ChildValues childValues_;
259 String document_;
260 String indentString_;
261 unsigned int rightMargin_{74};
262 unsigned int indentSize_{3};
263 bool addChildValues_{false};
264};
265#if defined(_MSC_VER)
266#pragma warning(pop)
267#endif
268
294#if defined(_MSC_VER)
295#pragma warning(push)
296#pragma warning(disable : 4996) // Deriving from deprecated class
297#endif
299public:
303 StyledStreamWriter(String indentation = "\t");
305
306public:
313 void write(OStream& out, const Value& root);
314
315private:
316 void writeValue(const Value& value);
317 void writeArrayValue(const Value& value);
318 bool isMultilineArray(const Value& value);
319 void pushValue(const String& value);
320 void writeIndent();
321 void writeWithIndent(const String& value);
322 void indent();
323 void unindent();
324 void writeCommentBeforeValue(const Value& root);
325 void writeCommentAfterValueOnSameLine(const Value& root);
326 static bool hasCommentForValue(const Value& value);
327 static String normalizeEOL(const String& text);
328
329 using ChildValues = std::vector<String>;
330
331 ChildValues childValues_;
332 OStream* document_;
333 String indentString_;
334 unsigned int rightMargin_{74};
335 String indentation_;
336 bool addChildValues_ : 1;
337 bool indented_ : 1;
338};
339#if defined(_MSC_VER)
340#pragma warning(pop)
341#endif
342
343#if defined(JSON_HAS_INT64)
346#endif // if defined(JSON_HAS_INT64)
347String JSON_API valueToString(LargestInt value);
348String JSON_API valueToString(LargestUInt value);
350 double value, unsigned int precision = Value::defaultRealPrecision,
351 PrecisionType precisionType = PrecisionType::significantDigits);
352String JSON_API valueToString(bool value);
353String JSON_API valueToQuotedString(const char* value);
354String JSON_API valueToQuotedString(const char* value, size_t length);
355
358JSON_API OStream& operator<<(OStream&, const Value& root);
359
360} // namespace Json
361
362#pragma pack(pop)
363
364#if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING)
365#pragma warning(pop)
366#endif // if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING)
367
368#endif // JSON_WRITER_H_INCLUDED
String write(const Value &root) override
void dropNullPlaceholders()
Drop the "null" string from the writer's output for nullValues.
void enableYAMLCompatibility()
~FastWriter() override=default
A simple abstract factory.
Definition writer.h:59
virtual StreamWriter * newStreamWriter() const =0
Allocate a CharReader via operator new().
StreamWriter * newStreamWriter() const override
bool validate(Json::Value *invalid) const
static void setDefaults(Json::Value *settings)
Called by ctor, but you can use this to reset settings_.
Json::Value settings_
Configuration of this builder.
Definition writer.h:122
Value & operator[](const String &key)
A simple way to update a specific setting.
virtual ~StreamWriter()
virtual int write(Value const &root, OStream *sout)=0
Write Value into document as configured in sub-class.
OStream * sout_
Definition writer.h:44
void write(OStream &out, const Value &root)
Serialize a Value in JSON format.
StyledStreamWriter(String indentation="\t")
~StyledWriter() override=default
String write(const Value &root) override
Serialize a Value in JSON format.
Represents a JSON value.
Definition value.h:194
static constexpr UInt defaultRealPrecision
Default precision for real value for string representation.
Definition value.h:247
Abstract class for writers.
Definition writer.h:151
virtual ~Writer()
virtual String write(const Value &root)=0
#define JSON_API
If defined, indicates that the source file is amalgamated to prevent private header inclusion.
Definition config.h:50
JSON (JavaScript Object Notation).
Definition allocator.h:15
String writeString(StreamWriter::Factory const &factory, Value const &root)
Write into stringstream, then return string, for convenience.
String valueToQuotedString(const char *value)
String valueToString(Int value)
unsigned int UInt
Definition config.h:109
OStream & operator<<(OStream &, const Value &root)
Output using the StyledStreamWriter.
int Int
Definition config.h:108
std::basic_string< char, std::char_traits< char >, Allocator< char > > String
Definition config.h:132
std::ostream OStream
Definition config.h:140
@ significantDigits
we set max number of significant digits in string
Definition value.h:130