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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />
<title>json-1.8.1 Documentation</title>
<link type="text/css" media="screen" href="rdoc.css" rel="stylesheet" />
<script src="js/jquery.js" type="text/javascript" charset="utf-8"></script>
<script src="js/thickbox-compressed.js" type="text/javascript" charset="utf-8"></script>
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</head>
<body class="indexpage">
<h1>json-1.8.1 Documentation</h1>
<div id="main">
<h2>Description</h2>
<p>This is a implementation of the <a href="JSON.html">JSON</a> specification
according to RFC 4627 <a
href="http://www.ietf.org/rfc/rfc4627.txt">www.ietf.org/rfc/rfc4627.txt</a>
. Starting from version 1.0.0 on there will be two variants available:</p>
<ul><li>
<p>A pure ruby variant, that relies on the iconv and the stringscan
extensions, which are both part of the ruby standard library.</p>
</li><li>
<p>The quite a bit faster C extension variant, which is in parts implemented
in C and comes with its own unicode conversion functions and a parser
generated by the ragel state machine compiler <a
href="http://www.cs.queensu.ca/~thurston/ragel">www.cs.queensu.ca/~thurston/ragel</a>
.</p>
</li></ul>
<p>Both variants of the <a href="JSON.html">JSON</a> generator generate UTF-8
character sequences by default. If an :ascii_only option with a true value
is given, they escape all non-ASCII and control characters with uXXXX
escape sequences, and support UTF-16 surrogate pairs in order to be able to
generate the whole range of unicode code points.</p>
<p>All strings, that are to be encoded as <a href="JSON.html">JSON</a>
strings, should be UTF-8 byte sequences on the Ruby side. To encode raw
binary strings, that aren’t UTF-8 encoded, please use the
to_json_raw_object method of String (which produces an object, that
contains a byte array) and decode the result on the receiving endpoint.</p>
<p>The <a href="JSON.html">JSON</a> parsers can parse UTF-8, UTF-16BE,
UTF-16LE, UTF-32BE, and UTF-32LE <a href="JSON.html">JSON</a> documents
under Ruby 1.8. Under Ruby 1.9 they take advantage of Ruby’s M17n features
and can parse all documents which have the correct String#encoding set. If
a document string has ASCII-8BIT as an encoding the parser attempts to
figure out which of the UTF encodings from above it is and trys to parse
it.</p>
<h2>Installation</h2>
<p>It’s recommended to use the extension variant of <a
href="JSON.html">JSON</a>, because it’s faster than the pure ruby variant.
If you cannot build it on your system, you can settle for the latter.</p>
<p>Just type into the command line as root:</p>
<pre># rake install</pre>
<p>The above command will build the extensions and install them on your
system.</p>
<pre># rake install_pure</pre>
<p>or</p>
<pre># ruby install.rb</pre>
<p>will just install the pure ruby implementation of <a
href="JSON.html">JSON</a>.</p>
<p>If you use Rubygems you can type</p>
<pre># gem install json</pre>
<p>instead, to install the newest <a href="JSON.html">JSON</a> version.</p>
<p>There is also a pure ruby json only variant of the gem, that can be
installed with:</p>
<pre># gem install json_pure</pre>
<h2>Compiling the extensions yourself</h2>
<p>If you want to build the extensions yourself you need rake:</p>
<pre>You can get it from rubyforge:
http://rubyforge.org/projects/rake
or just type
# gem install rake
for the installation via rubygems.</pre>
<p>If you want to create the parser.c file from its parser.rl file or draw
nice graphviz images of the state machines, you need ragel from: <a
href="http://www.cs.queensu.ca/~thurston/ragel">www.cs.queensu.ca/~thurston/ragel</a></p>
<h2>Usage</h2>
<p>To use <a href="JSON.html">JSON</a> you can</p>
<pre>require 'json'</pre>
<p>to load the installed variant (either the extension ‘json’ or the pure
variant ‘json_pure’). If you have installed the extension variant, you can
pick either the extension variant or the pure variant by typing</p>
<pre>require 'json/ext'</pre>
<p>or</p>
<pre>require 'json/pure'</pre>
<p>Now you can parse a <a href="JSON.html">JSON</a> document into a ruby data
structure by calling</p>
<pre>JSON.parse(document)</pre>
<p>If you want to generate a <a href="JSON.html">JSON</a> document from a ruby
data structure call</p>
<pre>JSON.generate(data)</pre>
<p>You can also use the pretty_generate method (which formats the output more
verbosely and nicely) or fast_generate (which doesn’t do any of the
security checks generate performs, e. g. nesting deepness checks).</p>
<p>To create a valid <a href="JSON.html">JSON</a> document you have to make
sure, that the output is embedded in either a <a href="JSON.html">JSON</a>
array [] or a <a href="JSON.html">JSON</a> object {}. The easiest way to do
this, is by putting your values in a Ruby Array or Hash instance.</p>
<p>There are also the <a href="JSON.html">JSON</a> and JSON[] methods which
use parse on a String or generate a <a href="JSON.html">JSON</a> document
from an array or hash:</p>
<pre>document = JSON 'test' =&gt; 23 # =&gt; &quot;{\&quot;test\&quot;:23}&quot;
document = JSON['test'] =&gt; 23 # =&gt; &quot;{\&quot;test\&quot;:23}&quot;</pre>
<p>and</p>
<pre>data = JSON '{&quot;test&quot;:23}' # =&gt; {&quot;test&quot;=&gt;23}
data = JSON['{&quot;test&quot;:23}'] # =&gt; {&quot;test&quot;=&gt;23}</pre>
<p>You can choose to load a set of common additions to ruby core’s objects if
you</p>
<pre>require 'json/add/core'</pre>
<p>After requiring this you can, e. g., serialise/deserialise Ruby ranges:</p>
<pre>JSON JSON(1..10) # =&gt; 1..10</pre>
<p>To find out how to add <a href="JSON.html">JSON</a> support to other or
your own classes, read the section “More Examples” below.</p>
<p>To get the best compatibility to rails’ <a href="JSON.html">JSON</a>
implementation, you can</p>
<pre>require 'json/add/rails'</pre>
<p>Both of the additions attempt to require ‘json’ (like above) first, if it
has not been required yet.</p>
<h2>More Examples</h2>
<p>To create a <a href="JSON.html">JSON</a> document from a ruby data
structure, you can call <a
href="JSON.html#method-i-generate">JSON.generate</a> like that:</p>
<pre>json = JSON.generate [1, 2, {&quot;a&quot;=&gt;3.141}, false, true, nil, 4..10]
# =&gt; &quot;[1,2,{\&quot;a\&quot;:3.141},false,true,null,\&quot;4..10\&quot;]&quot;</pre>
<p>To get back a ruby data structure from a <a href="JSON.html">JSON</a>
document, you have to call <a
href="JSON.html#method-i-parse">JSON.parse</a> on it:</p>
<pre>JSON.parse json
# =&gt; [1, 2, {&quot;a&quot;=&gt;3.141}, false, true, nil, &quot;4..10&quot;]</pre>
<p>Note, that the range from the original data structure is a simple string
now. The reason for this is, that <a href="JSON.html">JSON</a> doesn’t
support ranges or arbitrary classes. In this case the json library falls
back to call Object#to_json, which is the same as to_s.to_json.</p>
<p>It’s possible to add <a href="JSON.html">JSON</a> support serialization to
arbitrary classes by simply implementing a more specialized version of the
to_json method, that should return a <a href="JSON.html">JSON</a> object (a
hash converted to <a href="JSON.html">JSON</a> with to_json) like this
(don’t forget the *a for all the arguments):</p>
<pre>class Range
def to_json(*a)
{
'json_class' =&gt; self.class.name, # = 'Range'
'data' =&gt; [ first, last, exclude_end? ]
}.to_json(*a)
end
end</pre>
<p>The hash key ‘json_class’ is the class, that will be asked to deserialise
the <a href="JSON.html">JSON</a> representation later. In this case it’s
‘Range’, but any namespace of the form ‘A::B’ or ‘::A::B’ will do. All
other keys are arbitrary and can be used to store the necessary data to
configure the object to be deserialised.</p>
<p>If a the key ‘json_class’ is found in a <a href="JSON.html">JSON</a>
object, the <a href="JSON.html">JSON</a> parser checks if the given class
responds to the json_create class method. If so, it is called with the <a
href="JSON.html">JSON</a> object converted to a Ruby hash. So a range can
be deserialised by implementing <a
href="Range.html#method-c-json_create">Range.json_create</a> like this:</p>
<pre>class Range
def self.json_create(o)
new(*o['data'])
end
end</pre>
<p>Now it possible to serialise/deserialise ranges as well:</p>
<pre>json = JSON.generate [1, 2, {&quot;a&quot;=&gt;3.141}, false, true, nil, 4..10]
# =&gt; &quot;[1,2,{\&quot;a\&quot;:3.141},false,true,null,{\&quot;json_class\&quot;:\&quot;Range\&quot;,\&quot;data\&quot;:[4,10,false]}]&quot;
JSON.parse json
# =&gt; [1, 2, {&quot;a&quot;=&gt;3.141}, false, true, nil, 4..10]</pre>
<p><a href="JSON.html#method-i-generate">JSON.generate</a> always creates the
shortest possible string representation of a ruby data structure in one
line. This is good for data storage or network protocols, but not so good
for humans to read. Fortunately there's also <a
href="JSON.html#method-i-pretty_generate">JSON.pretty_generate</a> (or <a
href="JSON.html#method-i-pretty_generate">JSON.pretty_generate</a>) that
creates a more readable output:</p>
<pre>puts JSON.pretty_generate([1, 2, {&quot;a&quot;=&gt;3.141}, false, true, nil, 4..10])
[
1,
2,
{
&quot;a&quot;: 3.141
},
false,
true,
null,
{
&quot;json_class&quot;: &quot;Range&quot;,
&quot;data&quot;: [
4,
10,
false
]
}
]</pre>
<p>There are also the methods Kernel#j for generate, and Kernel#jj for
pretty_generate output to the console, that work analogous to Core Ruby’s p
and the pp library’s pp methods.</p>
<p>The script tools/server.rb contains a small example if you want to test,
how receiving a <a href="JSON.html">JSON</a> object from a webrick server
in your browser with the javasript prototype library <a
href="http://www.prototypejs.org">www.prototypejs.org</a> works.</p>
<h2>Speed Comparisons</h2>
<p>I have created some benchmark results (see the benchmarks/data-p4-3Ghz
subdir of the package) for the JSON-parser to estimate the speed up in the
C extension:</p>
<pre>Comparing times (call_time_mean):
1 ParserBenchmarkExt#parser 900 repeats:
553.922304770 ( real) -&gt; 21.500x
0.001805307
2 ParserBenchmarkYAML#parser 1000 repeats:
224.513358139 ( real) -&gt; 8.714x
0.004454078
3 ParserBenchmarkPure#parser 1000 repeats:
26.755020642 ( real) -&gt; 1.038x
0.037376163
4 ParserBenchmarkRails#parser 1000 repeats:
25.763381731 ( real) -&gt; 1.000x
0.038814780
calls/sec ( time) -&gt; speed covers
secs/call</pre>
<p>In the table above 1 is JSON::Ext::Parser, 2 is YAML.load with YAML
compatbile <a href="JSON.html">JSON</a> document, 3 is is <a
href="JSON/Pure/Parser.html">JSON::Pure::Parser</a>, and 4 is
ActiveSupport::JSON.decode. The ActiveSupport JSON-decoder converts the
input first to YAML and then uses the YAML-parser, the conversion seems to
slow it down so much that it is only as fast as the <a
href="JSON/Pure/Parser.html">JSON::Pure::Parser</a>!</p>
<p>If you look at the benchmark data you can see that this is mostly caused by
the frequent high outliers - the median of the Rails-parser runs is still
overall smaller than the median of the <a
href="JSON/Pure/Parser.html">JSON::Pure::Parser</a> runs:</p>
<pre>Comparing times (call_time_median):
1 ParserBenchmarkExt#parser 900 repeats:
800.592479481 ( real) -&gt; 26.936x
0.001249075
2 ParserBenchmarkYAML#parser 1000 repeats:
271.002390644 ( real) -&gt; 9.118x
0.003690004
3 ParserBenchmarkRails#parser 1000 repeats:
30.227910865 ( real) -&gt; 1.017x
0.033082008
4 ParserBenchmarkPure#parser 1000 repeats:
29.722384421 ( real) -&gt; 1.000x
0.033644676
calls/sec ( time) -&gt; speed covers
secs/call</pre>
<p>I have benchmarked the JSON-Generator as well. This generated a few more
values, because there are different modes that also influence the achieved
speed:</p>
<pre>Comparing times (call_time_mean):
1 GeneratorBenchmarkExt#generator_fast 1000 repeats:
547.354332608 ( real) -&gt; 15.090x
0.001826970
2 GeneratorBenchmarkExt#generator_safe 1000 repeats:
443.968212317 ( real) -&gt; 12.240x
0.002252414
3 GeneratorBenchmarkExt#generator_pretty 900 repeats:
375.104545883 ( real) -&gt; 10.341x
0.002665923
4 GeneratorBenchmarkPure#generator_fast 1000 repeats:
49.978706968 ( real) -&gt; 1.378x
0.020008521
5 GeneratorBenchmarkRails#generator 1000 repeats:
38.531868759 ( real) -&gt; 1.062x
0.025952543
6 GeneratorBenchmarkPure#generator_safe 1000 repeats:
36.927649925 ( real) -&gt; 1.018x 7 (&gt;=3859)
0.027079979
7 GeneratorBenchmarkPure#generator_pretty 1000 repeats:
36.272134441 ( real) -&gt; 1.000x 6 (&gt;=3859)
0.027569373
calls/sec ( time) -&gt; speed covers
secs/call</pre>
<p>In the table above 1-3 are JSON::Ext::Generator methods. 4, 6, and 7 are <a
href="JSON/Pure/Generator.html">JSON::Pure::Generator</a> methods and 5 is
the Rails <a href="JSON.html">JSON</a> generator. It is now a bit faster
than the generator_safe and generator_pretty methods of the pure variant
but slower than the others.</p>
<p>To achieve the fastest <a href="JSON.html">JSON</a> document output, you
can use the fast_generate method. Beware, that this will disable the
checking for circular Ruby data structures, which may cause <a
href="JSON.html">JSON</a> to go into an infinite loop.</p>
<p>Here are the median comparisons for completeness’ sake:</p>
<pre>Comparing times (call_time_median):
1 GeneratorBenchmarkExt#generator_fast 1000 repeats:
708.258020939 ( real) -&gt; 16.547x
0.001411915
2 GeneratorBenchmarkExt#generator_safe 1000 repeats:
569.105020353 ( real) -&gt; 13.296x
0.001757145
3 GeneratorBenchmarkExt#generator_pretty 900 repeats:
482.825371244 ( real) -&gt; 11.280x
0.002071142
4 GeneratorBenchmarkPure#generator_fast 1000 repeats:
62.717626652 ( real) -&gt; 1.465x
0.015944481
5 GeneratorBenchmarkRails#generator 1000 repeats:
43.965681162 ( real) -&gt; 1.027x
0.022745013
6 GeneratorBenchmarkPure#generator_safe 1000 repeats:
43.929073409 ( real) -&gt; 1.026x 7 (&gt;=3859)
0.022763968
7 GeneratorBenchmarkPure#generator_pretty 1000 repeats:
42.802514491 ( real) -&gt; 1.000x 6 (&gt;=3859)
0.023363113
calls/sec ( time) -&gt; speed covers
secs/call</pre>
<h2>Author</h2>
<p>Florian Frank &lt;<a href="mailto:flori@ping.de">flori@ping.de</a>&gt;</p>
<h2>License</h2>
<p>Ruby License, see the COPYING file included in the source distribution. The
Ruby License includes the GNU General Public License (GPL), Version 2, so
see the file GPL as well.</p>
<h2>Download</h2>
<p>The latest version of this library can be downloaded at</p>
<ul><li>
<p><a
href="http://rubyforge.org/frs?group_id=953">rubyforge.org/frs?group_id=953</a></p>
</li></ul>
<p>Online Documentation should be located at</p>
<ul><li>
<p><a href="http://json.rubyforge.org">json.rubyforge.org</a></p>
</li></ul>
</div>
<h2>Files</h2>
<ul>
<li class="file"><a href="README_rdoc.html">README.rdoc</a></li>
</ul>
<h2 id="classes">Classes/Modules</h2>
<ul>
<li class="module"><a href="JSON.html">JSON</a></li>
<li class="module"><a href="JSON/Ext.html">JSON::Ext</a></li>
<li class="class"><a href="JSON/GeneratorError.html">JSON::GeneratorError</a></li>
<li class="class"><a href="JSON/GenericObject.html">JSON::GenericObject</a></li>
<li class="class"><a href="JSON/JSONError.html">JSON::JSONError</a></li>
<li class="class"><a href="JSON/MissingUnicodeSupport.html">JSON::MissingUnicodeSupport</a></li>
<li class="class"><a href="JSON/NestingError.html">JSON::NestingError</a></li>
<li class="class"><a href="JSON/ParserError.html">JSON::ParserError</a></li>
<li class="module"><a href="JSON/Pure.html">JSON::Pure</a></li>
<li class="module"><a href="JSON/Pure/Generator.html">JSON::Pure::Generator</a></li>
<li class="module"><a href="JSON/Pure/Generator/GeneratorMethods.html">JSON::Pure::Generator::GeneratorMethods</a></li>
<li class="module"><a href="JSON/Pure/Generator/GeneratorMethods/Array.html">JSON::Pure::Generator::GeneratorMethods::Array</a></li>
<li class="module"><a href="JSON/Pure/Generator/GeneratorMethods/FalseClass.html">JSON::Pure::Generator::GeneratorMethods::FalseClass</a></li>
<li class="module"><a href="JSON/Pure/Generator/GeneratorMethods/Float.html">JSON::Pure::Generator::GeneratorMethods::Float</a></li>
<li class="module"><a href="JSON/Pure/Generator/GeneratorMethods/Hash.html">JSON::Pure::Generator::GeneratorMethods::Hash</a></li>
<li class="module"><a href="JSON/Pure/Generator/GeneratorMethods/Integer.html">JSON::Pure::Generator::GeneratorMethods::Integer</a></li>
<li class="module"><a href="JSON/Pure/Generator/GeneratorMethods/NilClass.html">JSON::Pure::Generator::GeneratorMethods::NilClass</a></li>
<li class="module"><a href="JSON/Pure/Generator/GeneratorMethods/Object.html">JSON::Pure::Generator::GeneratorMethods::Object</a></li>
<li class="module"><a href="JSON/Pure/Generator/GeneratorMethods/String.html">JSON::Pure::Generator::GeneratorMethods::String</a></li>
<li class="module"><a href="JSON/Pure/Generator/GeneratorMethods/String/Extend.html">JSON::Pure::Generator::GeneratorMethods::String::Extend</a></li>
<li class="module"><a href="JSON/Pure/Generator/GeneratorMethods/TrueClass.html">JSON::Pure::Generator::GeneratorMethods::TrueClass</a></li>
<li class="class"><a href="JSON/Pure/Generator/State.html">JSON::Pure::Generator::State</a></li>
<li class="class"><a href="JSON/Pure/Parser.html">JSON::Pure::Parser</a></li>
<li class="class"><a href="JSON/GeneratorError.html">JSON::UnparserError</a></li>
<li class="class"><a href="BigDecimal.html">BigDecimal</a></li>
<li class="class"><a href="Class.html">Class</a></li>
<li class="class"><a href="Complex.html">Complex</a></li>
<li class="class"><a href="Date.html">Date</a></li>
<li class="class"><a href="DateTime.html">DateTime</a></li>
<li class="class"><a href="Exception.html">Exception</a></li>
<li class="module"><a href="Kernel.html">Kernel</a></li>
<li class="class"><a href="OpenStruct.html">OpenStruct</a></li>
<li class="class"><a href="Range.html">Range</a></li>
<li class="class"><a href="Rational.html">Rational</a></li>
<li class="class"><a href="Regexp.html">Regexp</a></li>
<li class="class"><a href="Struct.html">Struct</a></li>
<li class="class"><a href="Symbol.html">Symbol</a></li>
<li class="class"><a href="Time.html">Time</a></li>
</ul>
<h2 id="methods">Methods</h2>
<ul>
<li><a href="JSON.html#method-c-5B-5D">::[] &mdash; JSON</a></li>
<li><a href="JSON.html#method-c-const_defined_in-3F">::const_defined_in? &mdash; JSON</a></li>
<li><a href="JSON/GenericObject.html#method-c-dump">::dump &mdash; JSON::GenericObject</a></li>
<li><a href="JSON/GenericObject.html#method-c-from_hash">::from_hash &mdash; JSON::GenericObject</a></li>
<li><a href="JSON/Pure/Generator/State.html#method-c-from_state">::from_state &mdash; JSON::Pure::Generator::State</a></li>
<li><a href="JSON.html#method-c-iconv">::iconv &mdash; JSON</a></li>
<li><a href="JSON/Pure/Generator/GeneratorMethods/String.html#method-c-included">::included &mdash; JSON::Pure::Generator::GeneratorMethods::String</a></li>
<li><a href="JSON/GenericObject.html#method-c-json_creatable-3F">::json_creatable? &mdash; JSON::GenericObject</a></li>
<li><a href="BigDecimal.html#method-c-json_create">::json_create &mdash; BigDecimal</a></li>
<li><a href="Time.html#method-c-json_create">::json_create &mdash; Time</a></li>
<li><a href="Rational.html#method-c-json_create">::json_create &mdash; Rational</a></li>
<li><a href="Complex.html#method-c-json_create">::json_create &mdash; Complex</a></li>
<li><a href="Regexp.html#method-c-json_create">::json_create &mdash; Regexp</a></li>
<li><a href="Struct.html#method-c-json_create">::json_create &mdash; Struct</a></li>
<li><a href="Range.html#method-c-json_create">::json_create &mdash; Range</a></li>
<li><a href="Symbol.html#method-c-json_create">::json_create &mdash; Symbol</a></li>
<li><a href="Date.html#method-c-json_create">::json_create &mdash; Date</a></li>
<li><a href="DateTime.html#method-c-json_create">::json_create &mdash; DateTime</a></li>
<li><a href="JSON/GenericObject.html#method-c-json_create">::json_create &mdash; JSON::GenericObject</a></li>
<li><a href="Exception.html#method-c-json_create">::json_create &mdash; Exception</a></li>
<li><a href="OpenStruct.html#method-c-json_create">::json_create &mdash; OpenStruct</a></li>
<li><a href="JSON/GenericObject.html#method-c-load">::load &mdash; JSON::GenericObject</a></li>
<li><a href="JSON/Pure/Parser.html#method-c-new">::new &mdash; JSON::Pure::Parser</a></li>
<li><a href="JSON/Pure/Generator/State.html#method-c-new">::new &mdash; JSON::Pure::Generator::State</a></li>
<li><a href="JSON.html#method-c-restore">::restore &mdash; JSON</a></li>
<li><a href="JSON.html#method-c-valid_utf8-3F">::valid_utf8? &mdash; JSON</a></li>
<li><a href="JSON/JSONError.html#method-c-wrap">::wrap &mdash; JSON::JSONError</a></li>
<li><a href="JSON/Pure/Generator/State.html#method-i-5B-5D">#[] &mdash; JSON::Pure::Generator::State</a></li>
<li><a href="JSON/GenericObject.html#method-i-5B-5D">#[] &mdash; JSON::GenericObject</a></li>
<li><a href="JSON/GenericObject.html#method-i-5B-5D-3D">#[]= &mdash; JSON::GenericObject</a></li>
<li><a href="JSON/Pure/Generator/State.html#method-i-5B-5D-3D">#[]= &mdash; JSON::Pure::Generator::State</a></li>
<li><a href="JSON/Pure/Generator/State.html#method-i-allow_nan-3F">#allow_nan? &mdash; JSON::Pure::Generator::State</a></li>
<li><a href="Complex.html#method-i-as_json">#as_json &mdash; Complex</a></li>
<li><a href="Symbol.html#method-i-as_json">#as_json &mdash; Symbol</a></li>
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