md_doc_features.html - third_party/rapidjson - Git at Google

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 <div class="PageDoc"><div class="header">
   <div class="headertitle">
 <div class="title">Features </div>  </div>
 </div><!--header-->
 <div class="contents">
 <div class="textblock"><h1><a class="anchor" id="autotoc_md35"></a>
 General</h1>
 <ul>
 <li>Cross-platform<ul>
 <li>Compilers: Visual Studio, gcc, clang, etc.</li>
 <li>Architectures: x86, x64, ARM, etc.</li>
 <li>Operating systems: Windows, Mac OS X, Linux, iOS, Android, etc.</li>
 </ul>
 </li>
 <li>Easy installation<ul>
 <li>Header files only library. Just copy the headers to your project.</li>
 </ul>
 </li>
 <li>Self-contained, minimal dependences<ul>
 <li>No STL, BOOST, etc.</li>
 <li>Only included <code>&lt;cstdio&gt;</code>, <code>&lt;cstdlib&gt;</code>, <code>&lt;cstring&gt;</code>, <code>&lt;inttypes.h&gt;</code>, <code>&lt;new&gt;</code>, <code>&lt;stdint.h&gt;</code>.</li>
 </ul>
 </li>
 <li>Without C++ exception, RTTI</li>
 <li>High performance<ul>
 <li>Use template and inline functions to reduce function call overheads.</li>
 <li>Internal optimized Grisu2 and floating point parsing implementations.</li>
 <li>Optional SSE2/SSE4.2 support.</li>
 </ul>
 </li>
 </ul>
 <h1><a class="anchor" id="autotoc_md36"></a>
 Standard compliance</h1>
 <ul>
 <li>RapidJSON should be fully RFC4627/ECMA-404 compliance.</li>
 <li>Support JSON Pointer (RFC6901).</li>
 <li>Support JSON Schema Draft v4.</li>
 <li>Support Unicode surrogate.</li>
 <li>Support null character (<code>"\u0000"</code>)<ul>
 <li>For example, <code>["Hello\u0000World"]</code> can be parsed and handled gracefully. There is API for getting/setting lengths of string.</li>
 </ul>
 </li>
 <li>Support optional relaxed syntax.<ul>
 <li>Single line (<code>// ...</code>) and multiple line (<code>/* ... */</code>) comments (<code>kParseCommentsFlag</code>).</li>
 <li>Trailing commas at the end of objects and arrays (<code>kParseTrailingCommasFlag</code>).</li>
 <li><code>NaN</code>, <code>Inf</code>, <code>Infinity</code>, <code>-Inf</code> and <code>-Infinity</code> as <code>double</code> values (<code>kParseNanAndInfFlag</code>)</li>
 </ul>
 </li>
 <li><a href="http://github.com/Tencent/rapidjson/blob/master/doc/npm.md">NPM compliant</a>.</li>
 </ul>
 <h1><a class="anchor" id="autotoc_md37"></a>
 Unicode</h1>
 <ul>
 <li>Support UTF-8, UTF-16, UTF-32 encodings, including little endian and big endian.<ul>
 <li>These encodings are used in input/output streams and in-memory representation.</li>
 </ul>
 </li>
 <li>Support automatic detection of encodings in input stream.</li>
 <li>Support transcoding between encodings internally.<ul>
 <li>For example, you can read a UTF-8 file and let RapidJSON transcode the JSON strings into UTF-16 in the DOM.</li>
 </ul>
 </li>
 <li>Support encoding validation internally.<ul>
 <li>For example, you can read a UTF-8 file, and let RapidJSON check whether all JSON strings are valid UTF-8 byte sequence.</li>
 </ul>
 </li>
 <li>Support custom character types.<ul>
 <li>By default the character types are <code>char</code> for UTF8, <code>wchar_t</code> for UTF16, <code>uint32_t</code> for UTF32.</li>
 </ul>
 </li>
 <li>Support custom encodings.</li>
 </ul>
 <h1><a class="anchor" id="autotoc_md38"></a>
 API styles</h1>
 <ul>
 <li>SAX (Simple API for XML) style API<ul>
 <li>Similar to <a href="http://en.wikipedia.org/wiki/Simple_API_for_XML">SAX</a>, RapidJSON provides a event sequential access parser API (<code><a class="el" href="classrapidjson_1_1_generic_reader.html" title="SAX-style JSON parser. Use Reader for UTF8 encoding and default allocator.">rapidjson::GenericReader</a></code>). It also provides a generator API (<code><a class="el" href="classrapidjson_1_1_writer.html" title="JSON writer.">rapidjson::Writer</a></code>) which consumes the same set of events.</li>
 </ul>
 </li>
 <li>DOM (Document Object Model) style API<ul>
 <li>Similar to <a href="http://en.wikipedia.org/wiki/Document_Object_Model">DOM</a> for HTML/XML, RapidJSON can parse JSON into a DOM representation (<code><a class="el" href="classrapidjson_1_1_generic_document.html" title="A document for parsing JSON text as DOM.">rapidjson::GenericDocument</a></code>), for easy manipulation, and finally stringify back to JSON if needed.</li>
 <li>The DOM style API (<code><a class="el" href="classrapidjson_1_1_generic_document.html" title="A document for parsing JSON text as DOM.">rapidjson::GenericDocument</a></code>) is actually implemented with SAX style API (<code><a class="el" href="classrapidjson_1_1_generic_reader.html" title="SAX-style JSON parser. Use Reader for UTF8 encoding and default allocator.">rapidjson::GenericReader</a></code>). SAX is faster but sometimes DOM is easier. Users can pick their choices according to scenarios.</li>
 </ul>
 </li>
 </ul>
 <h1><a class="anchor" id="autotoc_md39"></a>
 Parsing</h1>
 <ul>
 <li>Recursive (default) and iterative parser<ul>
 <li>Recursive parser is faster but prone to stack overflow in extreme cases.</li>
 <li>Iterative parser use custom stack to keep parsing state.</li>
 </ul>
 </li>
 <li>Support <em>in situ</em> parsing.<ul>
 <li>Parse JSON string values in-place at the source JSON, and then the DOM points to addresses of those strings.</li>
 <li>Faster than convention parsing: no allocation for strings, no copy (if string does not contain escapes), cache-friendly.</li>
 </ul>
 </li>
 <li>Support 32-bit/64-bit signed/unsigned integer and <code>double</code> for JSON number type.</li>
 <li>Support parsing multiple JSONs in input stream (<code>kParseStopWhenDoneFlag</code>).</li>
 <li>Error Handling<ul>
 <li>Support comprehensive error code if parsing failed.</li>
 <li>Support error message localization.</li>
 </ul>
 </li>
 </ul>
 <h1><a class="anchor" id="autotoc_md40"></a>
 DOM (Document)</h1>
 <ul>
 <li>RapidJSON checks range of numerical values for conversions.</li>
 <li>Optimization for string literal<ul>
 <li>Only store pointer instead of copying</li>
 </ul>
 </li>
 <li>Optimization for "short" strings<ul>
 <li>Store short string in <code>Value</code> internally without additional allocation.</li>
 <li>For UTF-8 string: maximum 11 characters in 32-bit, 21 characters in 64-bit (13 characters in x86-64).</li>
 </ul>
 </li>
 <li>Optionally support <code>std::string</code> (define <code>RAPIDJSON_HAS_STDSTRING=1</code>)</li>
 </ul>
 <h1><a class="anchor" id="autotoc_md41"></a>
 Generation</h1>
 <ul>
 <li>Support <code><a class="el" href="classrapidjson_1_1_pretty_writer.html" title="Writer with indentation and spacing.">rapidjson::PrettyWriter</a></code> for adding newlines and indentations.</li>
 </ul>
 <h1><a class="anchor" id="autotoc_md42"></a>
 Stream</h1>
 <ul>
 <li>Support <code><a class="el" href="classrapidjson_1_1_generic_string_buffer.html" title="Represents an in-memory output stream.">rapidjson::GenericStringBuffer</a></code> for storing the output JSON as string.</li>
 <li>Support <code><a class="el" href="classrapidjson_1_1_file_read_stream.html" title="File byte stream for input using fread().">rapidjson::FileReadStream</a></code> and <code><a class="el" href="classrapidjson_1_1_file_write_stream.html" title="Wrapper of C file stream for output using fwrite().">rapidjson::FileWriteStream</a></code> for input/output <code>FILE</code> object.</li>
 <li>Support custom streams.</li>
 </ul>
 <h1><a class="anchor" id="autotoc_md43"></a>
 Memory</h1>
 <ul>
 <li>Minimize memory overheads for DOM.<ul>
 <li>Each JSON value occupies exactly 16/20 bytes for most 32/64-bit machines (excluding text string).</li>
 </ul>
 </li>
 <li>Support fast default allocator.<ul>
 <li>A stack-based allocator (allocate sequentially, prohibit to free individual allocations, suitable for parsing).</li>
 <li>User can provide a pre-allocated buffer. (Possible to parse a number of JSONs without any CRT allocation)</li>
 </ul>
 </li>
 <li>Support standard CRT(C-runtime) allocator.</li>
 <li>Support custom allocators.</li>
 </ul>
 <h1><a class="anchor" id="autotoc_md44"></a>
 Miscellaneous</h1>
 <ul>
 <li>Some C++11 support (optional)<ul>
 <li>Rvalue reference</li>
 <li><code>noexcept</code> specifier</li>
 <li>Range-based for loop </li>
 </ul>
 </li>
 </ul>
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	<div class="PageDoc"><div class="header">
	<div class="headertitle">
	<div class="title">Features </div> </div>
	</div><!--header-->
	<div class="contents">
	<div class="textblock"><h1><a class="anchor" id="autotoc_md35"></a>
	General</h1>
	<ul>
	<li>Cross-platform<ul>
	<li>Compilers: Visual Studio, gcc, clang, etc.</li>
	<li>Architectures: x86, x64, ARM, etc.</li>
	<li>Operating systems: Windows, Mac OS X, Linux, iOS, Android, etc.</li>
	</ul>
	</li>
	<li>Easy installation<ul>
	<li>Header files only library. Just copy the headers to your project.</li>
	</ul>
	</li>
	<li>Self-contained, minimal dependences<ul>
	<li>No STL, BOOST, etc.</li>
	<li>Only included <code><cstdio></code>, <code><cstdlib></code>, <code><cstring></code>, <code><inttypes.h></code>, <code><new></code>, <code><stdint.h></code>.</li>
	</ul>
	</li>
	<li>Without C++ exception, RTTI</li>
	<li>High performance<ul>
	<li>Use template and inline functions to reduce function call overheads.</li>
	<li>Internal optimized Grisu2 and floating point parsing implementations.</li>
	<li>Optional SSE2/SSE4.2 support.</li>
	</ul>
	</li>
	</ul>
	<h1><a class="anchor" id="autotoc_md36"></a>
	Standard compliance</h1>
	<ul>
	<li>RapidJSON should be fully RFC4627/ECMA-404 compliance.</li>
	<li>Support JSON Pointer (RFC6901).</li>
	<li>Support JSON Schema Draft v4.</li>
	<li>Support Unicode surrogate.</li>
	<li>Support null character (<code>"\u0000"</code>)<ul>
	<li>For example, <code>["Hello\u0000World"]</code> can be parsed and handled gracefully. There is API for getting/setting lengths of string.</li>
	</ul>
	</li>
	<li>Support optional relaxed syntax.<ul>
	<li>Single line (<code>// ...</code>) and multiple line (<code>/* ... */</code>) comments (<code>kParseCommentsFlag</code>).</li>
	<li>Trailing commas at the end of objects and arrays (<code>kParseTrailingCommasFlag</code>).</li>
	<li><code>NaN</code>, <code>Inf</code>, <code>Infinity</code>, <code>-Inf</code> and <code>-Infinity</code> as <code>double</code> values (<code>kParseNanAndInfFlag</code>)</li>
	</ul>
	</li>
	<li><a href="http://github.com/Tencent/rapidjson/blob/master/doc/npm.md">NPM compliant</a>.</li>
	</ul>
	<h1><a class="anchor" id="autotoc_md37"></a>
	Unicode</h1>
	<ul>
	<li>Support UTF-8, UTF-16, UTF-32 encodings, including little endian and big endian.<ul>
	<li>These encodings are used in input/output streams and in-memory representation.</li>
	</ul>
	</li>
	<li>Support automatic detection of encodings in input stream.</li>
	<li>Support transcoding between encodings internally.<ul>
	<li>For example, you can read a UTF-8 file and let RapidJSON transcode the JSON strings into UTF-16 in the DOM.</li>
	</ul>
	</li>
	<li>Support encoding validation internally.<ul>
	<li>For example, you can read a UTF-8 file, and let RapidJSON check whether all JSON strings are valid UTF-8 byte sequence.</li>
	</ul>
	</li>
	<li>Support custom character types.<ul>
	<li>By default the character types are <code>char</code> for UTF8, <code>wchar_t</code> for UTF16, <code>uint32_t</code> for UTF32.</li>
	</ul>
	</li>
	<li>Support custom encodings.</li>
	</ul>
	<h1><a class="anchor" id="autotoc_md38"></a>
	API styles</h1>
	<ul>
	<li>SAX (Simple API for XML) style API<ul>
	<li>Similar to <a href="http://en.wikipedia.org/wiki/Simple_API_for_XML">SAX</a>, RapidJSON provides a event sequential access parser API (<code><a class="el" href="classrapidjson_1_1_generic_reader.html" title="SAX-style JSON parser. Use Reader for UTF8 encoding and default allocator.">rapidjson::GenericReader</a></code>). It also provides a generator API (<code><a class="el" href="classrapidjson_1_1_writer.html" title="JSON writer.">rapidjson::Writer</a></code>) which consumes the same set of events.</li>
	</ul>
	</li>
	<li>DOM (Document Object Model) style API<ul>
	<li>Similar to <a href="http://en.wikipedia.org/wiki/Document_Object_Model">DOM</a> for HTML/XML, RapidJSON can parse JSON into a DOM representation (<code><a class="el" href="classrapidjson_1_1_generic_document.html" title="A document for parsing JSON text as DOM.">rapidjson::GenericDocument</a></code>), for easy manipulation, and finally stringify back to JSON if needed.</li>
	<li>The DOM style API (<code><a class="el" href="classrapidjson_1_1_generic_document.html" title="A document for parsing JSON text as DOM.">rapidjson::GenericDocument</a></code>) is actually implemented with SAX style API (<code><a class="el" href="classrapidjson_1_1_generic_reader.html" title="SAX-style JSON parser. Use Reader for UTF8 encoding and default allocator.">rapidjson::GenericReader</a></code>). SAX is faster but sometimes DOM is easier. Users can pick their choices according to scenarios.</li>
	</ul>
	</li>
	</ul>
	<h1><a class="anchor" id="autotoc_md39"></a>
	Parsing</h1>
	<ul>
	<li>Recursive (default) and iterative parser<ul>
	<li>Recursive parser is faster but prone to stack overflow in extreme cases.</li>
	<li>Iterative parser use custom stack to keep parsing state.</li>
	</ul>
	</li>
	<li>Support <em>in situ</em> parsing.<ul>
	<li>Parse JSON string values in-place at the source JSON, and then the DOM points to addresses of those strings.</li>
	<li>Faster than convention parsing: no allocation for strings, no copy (if string does not contain escapes), cache-friendly.</li>
	</ul>
	</li>
	<li>Support 32-bit/64-bit signed/unsigned integer and <code>double</code> for JSON number type.</li>
	<li>Support parsing multiple JSONs in input stream (<code>kParseStopWhenDoneFlag</code>).</li>
	<li>Error Handling<ul>
	<li>Support comprehensive error code if parsing failed.</li>
	<li>Support error message localization.</li>
	</ul>
	</li>
	</ul>
	<h1><a class="anchor" id="autotoc_md40"></a>
	DOM (Document)</h1>
	<ul>
	<li>RapidJSON checks range of numerical values for conversions.</li>
	<li>Optimization for string literal<ul>
	<li>Only store pointer instead of copying</li>
	</ul>
	</li>
	<li>Optimization for "short" strings<ul>
	<li>Store short string in <code>Value</code> internally without additional allocation.</li>
	<li>For UTF-8 string: maximum 11 characters in 32-bit, 21 characters in 64-bit (13 characters in x86-64).</li>
	</ul>
	</li>
	<li>Optionally support <code>std::string</code> (define <code>RAPIDJSON_HAS_STDSTRING=1</code>)</li>
	</ul>
	<h1><a class="anchor" id="autotoc_md41"></a>
	Generation</h1>
	<ul>
	<li>Support <code><a class="el" href="classrapidjson_1_1_pretty_writer.html" title="Writer with indentation and spacing.">rapidjson::PrettyWriter</a></code> for adding newlines and indentations.</li>
	</ul>
	<h1><a class="anchor" id="autotoc_md42"></a>
	Stream</h1>
	<ul>
	<li>Support <code><a class="el" href="classrapidjson_1_1_generic_string_buffer.html" title="Represents an in-memory output stream.">rapidjson::GenericStringBuffer</a></code> for storing the output JSON as string.</li>
	<li>Support <code><a class="el" href="classrapidjson_1_1_file_read_stream.html" title="File byte stream for input using fread().">rapidjson::FileReadStream</a></code> and <code><a class="el" href="classrapidjson_1_1_file_write_stream.html" title="Wrapper of C file stream for output using fwrite().">rapidjson::FileWriteStream</a></code> for input/output <code>FILE</code> object.</li>
	<li>Support custom streams.</li>
	</ul>
	<h1><a class="anchor" id="autotoc_md43"></a>
	Memory</h1>
	<ul>
	<li>Minimize memory overheads for DOM.<ul>
	<li>Each JSON value occupies exactly 16/20 bytes for most 32/64-bit machines (excluding text string).</li>
	</ul>
	</li>
	<li>Support fast default allocator.<ul>
	<li>A stack-based allocator (allocate sequentially, prohibit to free individual allocations, suitable for parsing).</li>
	<li>User can provide a pre-allocated buffer. (Possible to parse a number of JSONs without any CRT allocation)</li>
	</ul>
	</li>
	<li>Support standard CRT(C-runtime) allocator.</li>
	<li>Support custom allocators.</li>
	</ul>
	<h1><a class="anchor" id="autotoc_md44"></a>
	Miscellaneous</h1>
	<ul>
	<li>Some C++11 support (optional)<ul>
	<li>Rvalue reference</li>
	<li><code>noexcept</code> specifier</li>
	<li>Range-based for loop </li>
	</ul>
	</li>
	</ul>
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