// 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 //! Combination of PrettyWriter format flags. /*! \see PrettyWriter::SetFormatOptions */ enum PrettyFormatOptions { kFormatDefault = 0, //!< Default pretty formatting. kFormatSingleLineArray = 1 //!< Format arrays on a single line. }; //! Writer with indentation and spacing. /*! \tparam OutputStream Type of ouptut os. \tparam SourceEncoding Encoding of source string. \tparam TargetEncoding Encoding of output stream. \tparam StackAllocator Type of allocator for allocating memory of stack. */ template<typename OutputStream, typename SourceEncoding = UTF8<>, typename TargetEncoding = UTF8<>, typename StackAllocator = CrtAllocator, unsigned writeFlags = kWriteDefaultFlags> class PrettyWriter : public Writer<OutputStream, SourceEncoding, TargetEncoding, StackAllocator, writeFlags> { public: typedef Writer<OutputStream, SourceEncoding, TargetEncoding, StackAllocator> Base; typedef typename Base::Ch Ch; //! Constructor /*! \param os Output stream. \param allocator User supplied allocator. If it is null, it will create a private one. \param levelDepth Initial capacity of stack. */ explicit PrettyWriter(OutputStream& os, StackAllocator* allocator = 0, size_t levelDepth = Base::kDefaultLevelDepth) : Base(os, allocator, levelDepth), indentChar_(' '), indentCharCount_(4), formatOptions_(kFormatDefault) {} explicit PrettyWriter(StackAllocator* allocator = 0, size_t levelDepth = Base::kDefaultLevelDepth) : Base(allocator, levelDepth), indentChar_(' '), indentCharCount_(4) {} //! Set custom indentation. /*! \param indentChar Character for indentation. Must be whitespace character (' ', '\\t', '\\n', '\\r'). \param indentCharCount Number of indent characters for each indentation level. \note The default indentation is 4 spaces. */ PrettyWriter& SetIndent(Ch indentChar, unsigned indentCharCount) { RAPIDJSON_ASSERT(indentChar == ' ' || indentChar == '\t' || indentChar == '\n' || indentChar == '\r'); indentChar_ = indentChar; indentCharCount_ = indentCharCount; return *this; } //! Set pretty writer formatting options. /*! \param options Formatting options. */ PrettyWriter& SetFormatOptions(PrettyFormatOptions options) { formatOptions_ = options; return *this; } /*! @name Implementation of Handler \see Handler */ //@{ 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 RawNumber(const Ch* str, SizeType length, bool copy = false) { (void)copy; PrettyPrefix(kNumberType); return Base::WriteString(str, length); } 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); } #if RAPIDJSON_HAS_STDSTRING bool Key(const std::basic_string<Ch>& str) { return Key(str.data(), SizeType(str.size())); } #endif 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 && !(formatOptions_ & kFormatSingleLineArray)) { 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; } //@} /*! @name Convenience extensions */ //@{ //! Simpler but slower overload. bool String(const Ch* str) { return String(str, internal::StrLen(str)); } bool Key(const Ch* str) { return Key(str, internal::StrLen(str)); } //@} //! Write a raw JSON value. /*! For user to write a stringified JSON as a value. \param json A well-formed JSON value. It should not contain null character within [0, length - 1] range. \param length Length of the json. \param type Type of the root of json. \note When using PrettyWriter::RawValue(), the result json may not be indented correctly. */ bool RawValue(const Ch* json, size_t length, Type type) { PrettyPrefix(type); return Base::WriteRawValue(json, length); } 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 if (formatOptions_ & kFormatSingleLineArray) Base::os_->Put(' '); } if (!(formatOptions_ & kFormatSingleLineArray)) { 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_, static_cast<typename TargetEncoding::Ch>(indentChar_), count); } Ch indentChar_; unsigned indentCharCount_; PrettyFormatOptions formatOptions_; 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_