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diff --git a/src/rapidjson/doc/features.md b/src/rapidjson/doc/features.md new file mode 100644 index 00000000..732fb21f --- /dev/null +++ b/src/rapidjson/doc/features.md @@ -0,0 +1,104 @@ +# Features + +## General + +* Cross-platform + * Compilers: Visual Studio, gcc, clang, etc. + * Architectures: x86, x64, ARM, etc. + * Operating systems: Windows, Mac OS X, Linux, iOS, Android, etc. +* Easy installation + * Header files only library. Just copy the headers to your project. +* Self-contained, minimal dependences + * No STL, BOOST, etc. + * Only included `<cstdio>`, `<cstdlib>`, `<cstring>`, `<inttypes.h>`, `<new>`, `<stdint.h>`. +* Without C++ exception, RTTI +* High performance + * Use template and inline functions to reduce function call overheads. + * Internal optimized Grisu2 and floating point parsing implementations. + * Optional SSE2/SSE4.2 support. + +## Standard compliance + +* RapidJSON should be fully RFC4627/ECMA-404 compliance. +* Support JSON Pointer (RFC6901). +* Support JSON Schema Draft v4. +* Support Unicode surrogate. +* Support null character (`"\u0000"`) + * For example, `["Hello\u0000World"]` can be parsed and handled gracefully. There is API for getting/setting lengths of string. +* Support optional relaxed syntax. + * Single line (`// ...`) and multiple line (`/* ... */`) comments (`kParseCommentsFlag`). + * Trailing commas at the end of objects and arrays (`kParseTrailingCommasFlag`). + * `NaN`, `Inf`, `Infinity`, `-Inf` and `-Infinity` as `double` values (`kParseNanAndInfFlag`) +* [NPM compliant](http://github.com/miloyip/rapidjson/blob/master/doc/npm.md). + +## Unicode + +* Support UTF-8, UTF-16, UTF-32 encodings, including little endian and big endian. + * These encodings are used in input/output streams and in-memory representation. +* Support automatic detection of encodings in input stream. +* Support transcoding between encodings internally. + * For example, you can read a UTF-8 file and let RapidJSON transcode the JSON strings into UTF-16 in the DOM. +* Support encoding validation internally. + * For example, you can read a UTF-8 file, and let RapidJSON check whether all JSON strings are valid UTF-8 byte sequence. +* Support custom character types. + * By default the character types are `char` for UTF8, `wchar_t` for UTF16, `uint32_t` for UTF32. +* Support custom encodings. + +## API styles + +* SAX (Simple API for XML) style API + * Similar to [SAX](http://en.wikipedia.org/wiki/Simple_API_for_XML), RapidJSON provides a event sequential access parser API (`rapidjson::GenericReader`). It also provides a generator API (`rapidjson::Writer`) which consumes the same set of events. +* DOM (Document Object Model) style API + * Similar to [DOM](http://en.wikipedia.org/wiki/Document_Object_Model) for HTML/XML, RapidJSON can parse JSON into a DOM representation (`rapidjson::GenericDocument`), for easy manipulation, and finally stringify back to JSON if needed. + * The DOM style API (`rapidjson::GenericDocument`) is actually implemented with SAX style API (`rapidjson::GenericReader`). SAX is faster but sometimes DOM is easier. Users can pick their choices according to scenarios. + +## Parsing + +* Recursive (default) and iterative parser + * Recursive parser is faster but prone to stack overflow in extreme cases. + * Iterative parser use custom stack to keep parsing state. +* Support *in situ* parsing. + * Parse JSON string values in-place at the source JSON, and then the DOM points to addresses of those strings. + * Faster than convention parsing: no allocation for strings, no copy (if string does not contain escapes), cache-friendly. +* Support 32-bit/64-bit signed/unsigned integer and `double` for JSON number type. +* Support parsing multiple JSONs in input stream (`kParseStopWhenDoneFlag`). +* Error Handling + * Support comprehensive error code if parsing failed. + * Support error message localization. + +## DOM (Document) + +* RapidJSON checks range of numerical values for conversions. +* Optimization for string literal + * Only store pointer instead of copying +* Optimization for "short" strings + * Store short string in `Value` internally without additional allocation. + * For UTF-8 string: maximum 11 characters in 32-bit, 21 characters in 64-bit (13 characters in x86-64). +* Optionally support `std::string` (define `RAPIDJSON_HAS_STDSTRING=1`) + +## Generation + +* Support `rapidjson::PrettyWriter` for adding newlines and indentations. + +## Stream + +* Support `rapidjson::GenericStringBuffer` for storing the output JSON as string. +* Support `rapidjson::FileReadStream` and `rapidjson::FileWriteStream` for input/output `FILE` object. +* Support custom streams. + +## Memory + +* Minimize memory overheads for DOM. + * Each JSON value occupies exactly 16/20 bytes for most 32/64-bit machines (excluding text string). +* Support fast default allocator. + * A stack-based allocator (allocate sequentially, prohibit to free individual allocations, suitable for parsing). + * User can provide a pre-allocated buffer. (Possible to parse a number of JSONs without any CRT allocation) +* Support standard CRT(C-runtime) allocator. +* Support custom allocators. + +## Miscellaneous + +* Some C++11 support (optional) + * Rvalue reference + * `noexcept` specifier + * Range-based for loop |