prettywriter.h

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// Tencent is pleased to support the open source community by making RapidJSON available.
// 
// Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
//
// Licensed under the MIT License (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
//
// http://opensource.org/licenses/MIT
//
// Unless required by applicable law or agreed to in writing, software distributed 
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR 
// CONDITIONS OF ANY KIND, either express or implied. See the License for the 
// specific language governing permissions and limitations under the License.

#ifndef RAPIDJSON_PRETTYWRITER_H_
#define RAPIDJSON_PRETTYWRITER_H_

#include "writer.h"

#ifdef __GNUC__
RAPIDJSON_DIAG_PUSH
RAPIDJSON_DIAG_OFF(effc++)
#endif

RAPIDJSON_NAMESPACE_BEGIN


template<typename OutputStream, typename SourceEncoding = UTF8<>, typename TargetEncoding = UTF8<>, typename StackAllocator = CrtAllocator>
class PrettyWriter : public Writer<OutputStream, SourceEncoding, TargetEncoding, StackAllocator> {
public:
 typedef Writer<OutputStream, SourceEncoding, TargetEncoding, StackAllocator> Base;
 typedef typename Base::Ch Ch;


 PrettyWriter(OutputStream& os, StackAllocator* allocator = 0, size_t levelDepth = Base::kDefaultLevelDepth) : 
 Base(os, allocator, levelDepth), indentChar_(' '), indentCharCount_(4) {}


 PrettyWriter& SetIndent(Ch indentChar, unsigned indentCharCount) {
 RAPIDJSON_ASSERT(indentChar == ' ' || indentChar == '\t' || indentChar == '\n' || indentChar == '\r');
 indentChar_ = indentChar;
 indentCharCount_ = indentCharCount;
 return *this;
 }


 bool Null() { PrettyPrefix(kNullType); return Base::WriteNull(); }
 bool Bool(bool b) { PrettyPrefix(b ? kTrueType : kFalseType); return Base::WriteBool(b); }
 bool Int(int i) { PrettyPrefix(kNumberType); return Base::WriteInt(i); }
 bool Uint(unsigned u) { PrettyPrefix(kNumberType); return Base::WriteUint(u); }
 bool Int64(int64_t i64) { PrettyPrefix(kNumberType); return Base::WriteInt64(i64); }
 bool Uint64(uint64_t u64) { PrettyPrefix(kNumberType); return Base::WriteUint64(u64); }
 bool Double(double d) { PrettyPrefix(kNumberType); return Base::WriteDouble(d); }

 bool String(const Ch* str, SizeType length, bool copy = false) {
 (void)copy;
 PrettyPrefix(kStringType);
 return Base::WriteString(str, length);
 }

#if RAPIDJSON_HAS_STDSTRING
 bool String(const std::basic_string<Ch>& str) {
 return String(str.data(), SizeType(str.size()));
 }
#endif

 bool StartObject() {
 PrettyPrefix(kObjectType);
 new (Base::level_stack_.template Push<typename Base::Level>()) typename Base::Level(false);
 return Base::WriteStartObject();
 }

 bool Key(const Ch* str, SizeType length, bool copy = false) { return String(str, length, copy); }
 
 bool EndObject(SizeType memberCount = 0) {
 (void)memberCount;
 RAPIDJSON_ASSERT(Base::level_stack_.GetSize() >= sizeof(typename Base::Level));
 RAPIDJSON_ASSERT(!Base::level_stack_.template Top<typename Base::Level>()->inArray);
 bool empty = Base::level_stack_.template Pop<typename Base::Level>(1)->valueCount == 0;

 if (!empty) {
 Base::os_->Put('\n');
 WriteIndent();
 }
 bool ret = Base::WriteEndObject();
 (void)ret;
 RAPIDJSON_ASSERT(ret == true);
 if (Base::level_stack_.Empty()) // end of json text
 Base::os_->Flush();
 return true;
 }

 bool StartArray() {
 PrettyPrefix(kArrayType);
 new (Base::level_stack_.template Push<typename Base::Level>()) typename Base::Level(true);
 return Base::WriteStartArray();
 }

 bool EndArray(SizeType memberCount = 0) {
 (void)memberCount;
 RAPIDJSON_ASSERT(Base::level_stack_.GetSize() >= sizeof(typename Base::Level));
 RAPIDJSON_ASSERT(Base::level_stack_.template Top<typename Base::Level>()->inArray);
 bool empty = Base::level_stack_.template Pop<typename Base::Level>(1)->valueCount == 0;

 if (!empty) {
 Base::os_->Put('\n');
 WriteIndent();
 }
 bool ret = Base::WriteEndArray();
 (void)ret;
 RAPIDJSON_ASSERT(ret == true);
 if (Base::level_stack_.Empty()) // end of json text
 Base::os_->Flush();
 return true;
 }



 bool String(const Ch* str) { return String(str, internal::StrLen(str)); }
 bool Key(const Ch* str) { return Key(str, internal::StrLen(str)); }

protected:
 void PrettyPrefix(Type type) {
 (void)type;
 if (Base::level_stack_.GetSize() != 0) { // this value is not at root
 typename Base::Level* level = Base::level_stack_.template Top<typename Base::Level>();

 if (level->inArray) {
 if (level->valueCount > 0) {
 Base::os_->Put(','); // add comma if it is not the first element in array
 Base::os_->Put('\n');
 }
 else
 Base::os_->Put('\n');
 WriteIndent();
 }
 else { // in object
 if (level->valueCount > 0) {
 if (level->valueCount % 2 == 0) {
 Base::os_->Put(',');
 Base::os_->Put('\n');
 }
 else {
 Base::os_->Put(':');
 Base::os_->Put(' ');
 }
 }
 else
 Base::os_->Put('\n');

 if (level->valueCount % 2 == 0)
 WriteIndent();
 }
 if (!level->inArray && level->valueCount % 2 == 0)
 RAPIDJSON_ASSERT(type == kStringType); // if it's in object, then even number should be a name
 level->valueCount++;
 }
 else {
 RAPIDJSON_ASSERT(!Base::hasRoot_); // Should only has one and only one root.
 Base::hasRoot_ = true;
 }
 }

 void WriteIndent() {
 size_t count = (Base::level_stack_.GetSize() / sizeof(typename Base::Level)) * indentCharCount_;
 PutN(*Base::os_, indentChar_, count);
 }

 Ch indentChar_;
 unsigned indentCharCount_;

private:
 // Prohibit copy constructor & assignment operator.
 PrettyWriter(const PrettyWriter&);
 PrettyWriter& operator=(const PrettyWriter&);
};

RAPIDJSON_NAMESPACE_END

#ifdef __GNUC__
RAPIDJSON_DIAG_POP
#endif

#endif // RAPIDJSON_RAPIDJSON_H_