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jsoncvt.html
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jsoncvt.html
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<!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 http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" />
<meta name="generator" content="AsciiDoc 8.6.9" />
<title>jsoncvt(1)</title>
<style type="text/css">
/* Shared CSS for AsciiDoc xhtml11 and html5 backends */
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/* Title font. */
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margin-bottom: 0.5em;
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color: navy;
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pre {
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margin-bottom: 2.0em;
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span.maroon { color: maroon; }
span.navy { color: navy; }
span.olive { color: olive; }
span.purple { color: purple; }
span.red { color: red; }
span.silver { color: silver; }
span.teal { color: teal; }
span.white { color: white; }
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span.black-background { background: black; }
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/*
* xhtml11 specific
*
* */
div.tableblock {
margin-top: 1.0em;
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p.table {
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}
/* Because the table frame attribute is overriden by CSS in most browsers. */
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border-style: none;
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/*
* html5 specific
*
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}
body.manpage div.sectionbody {
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@media print {
body.manpage div#toc { display: none; }
}
</style>
<script type="text/javascript">
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<body class="article">
<div id="header">
<h1>jsoncvt(1)</h1>
<span id="author">Bob Krzaczek</span><br />
<span id="email"><code><<a href="mailto:krz@cis.rit.edu">krz@cis.rit.edu</a>></code></span><br />
<span id="revdate">2014-Jul-14</span>
</div>
<div id="content">
<div class="sect1">
<h2 id="_name">NAME</h2>
<div class="sectionbody">
<div class="paragraph"><p>jsoncvt - convert JSON to native language representations</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="paragraph"><p>jsoncvt [-Akx] [label]</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p><strong>jsoncvt</strong> reads JSON formatted data from its standard input, and
prints it back out in a native represetnation for various languages on
the standard output stream. It is mostly meant for dynamic languages
that can evaluate new values on the fly, but do not already have a
JSON parser built into them.</p></div>
<div class="paragraph"><p>If the <strong>label</strong> argument is supplied, it becomes the name of the
toplevel value in the tree of parsed JSON data. Some languages do not
require this (XML). Other languages (ksh), which must bind their
values to a variable, do require some kind of name to label data. When
not supplied, the metaword <strong>foobar</strong> is used by default.</p></div>
<div class="paragraph"><p>UTF-8 JSON input is assumed. Both the <strong>ksh93</strong> and <strong>XML</strong> output formats
support it and use the appropriate mechanisms.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_options">OPTIONS</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
<strong>-A</strong>
</dt>
<dd>
<p>
When converting to <strong>ksh93</strong> format, JSON objects are reprented
as associative arrays, instead of compound variables.
This is especially useful when object key strings containing
characters outside the usual characters used in variable
names are present.
</p>
</dd>
<dt class="hdlist1">
<strong>-k</strong>
</dt>
<dd>
<p>
Converts the parsed JSON data into <strong>ksh93</strong> text.
</p>
</dd>
<dt class="hdlist1">
<strong>-x</strong>
</dt>
<dd>
<p>
Converts the parsed JSON data into a compact <strong>XML</strong> format.
This might be useful when you have an XML parser but no JSON
parser.
</p>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_formats">FORMATS</h2>
<div class="sectionbody">
<div class="paragraph"><p>Refer to the following JSON stream when considering the formats below.</p></div>
<div class="listingblock">
<div class="content">
<pre><code>{
"first" : "Bob",
"last" : "Krzaczek",
"email" : "Robert.Krzaczek@gmail.com",
"lucky" : 13,
"quarter" : 0.25,
"empty" : null,
"nerd" : true,
"lotto" : [ 9, 12, 17, 38, 45, 46 ]
}</code></pre>
</div></div>
<div class="sect2">
<h3 id="_ksh93">ksh93</h3>
<div class="paragraph"><p>This output format uses features in a recent version of ksh93,
supporting compound variables and typed arrays. Its output is meant to
be fed to an <strong>eval</strong> statement, and assumes standard aliases and
setting for variables such as <strong>IFS</strong> are in place.</p></div>
<div class="paragraph"><p>The JSON above is rendered in the following format:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>compound foobar=(
first=$'Bob'
last=$'Krzaczek'
email=$'Robert.Krzaczek@gmail.com'
integer lucky=13
float quarter=0.25
empty=
bool nerd=true
integer -a lotto=(
9
12
17
38
45
46
)
)</code></pre>
</div></div>
<div class="paragraph"><p>When the <strong>-A</strong> flag is in effect, the output becomes:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>typeset -A foobar=(
[first]=$'Bob'
[last]=$'Krzaczek'
[email]=$'Robert.Krzaczek@gmail.com'
[lucky]=13
[quarter]=0.25
[empty]=
[nerd]=true
[lotto]=(
9
12
17
38
45
46
)
)</code></pre>
</div></div>
</div>
<div class="sect2">
<h3 id="_xml">XML</h3>
<div class="paragraph"><p>This output format is a fairly minimal use of XML, but represents the
most natural translation of data that’s already limited to JSON
constructs. The result wouldn’t be hard to parse with either SAX or
DOM approaches.</p></div>
<div class="paragraph"><p>The following grammar allows more than just an array or object at the
top level of the data; in that way, it is something of a superset of
JSON.</p></div>
<div class="listingblock">
<div class="content">
<pre><code><!ELEMENT jsoncvt (array|object|string|number|null|true|false)>
<!ELEMENT array (array|object|string|number|null|true|false)*>
<!ATTLIST array name CDATA #IMPLIED>
<!ELEMENT object (array|object|string|number|null|true|false)*>
<!ATTLIST object name CDATA #IMPLIED>
<!ELEMENT number (#PCDATA)>
<!ATTLIST number name CDATA #IMPLIED>
<!ELEMENT string (#PCDATA)>
<!ATTLIST string name CDATA #IMPLIED>
<!ELEMENT null EMPTY>
<!ATTLIST null name CDATA #IMPLIED>
<!ELEMENT true EMPTY>
<!ATTLIST true name CDATA #IMPLIED>
<!ELEMENT false EMPTY>
<!ATTLIST false name CDATA #IMPLIED></code></pre>
</div></div>
<div class="paragraph"><p>Converting the JSON example above yields:</p></div>
<div class="listingblock">
<div class="content">
<pre><code><?xml version='1.0' encoding='utf-8' ?>
<data>
<object name='foobar'>
<string name='first'>Bob</string>
<string name='last'>Krzaczek</string>
<string name='email'>Robert.Krzaczek@gmail.com</string>
<number name='lucky'>13</number>
<number name='quarter'>0.25</number>
<null name='empty' />
<true name='nerd' />
<array name='lotto'>
<number>9</number>
<number>12</number>
<number>17</number>
<number>38</number>
<number>45</number>
<number>46</number>
</array>
</object>
</data></code></pre>
</div></div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_status">STATUS</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
<strong>0</strong>
</dt>
<dd>
<p>
Success. The JSON file contains no errors, was successfully
parsed, and the selected output format was generated.
</p>
</dd>
<dt class="hdlist1">
<strong>1</strong>
</dt>
<dd>
<p>
Failure. There was either a problem in the JSON data provided,
or some aspect of that data could not be represented in the
selected format.
</p>
</dd>
<dt class="hdlist1">
<strong>2</strong>
</dt>
<dd>
<p>
Failure. There was a problem with the options or arguments
provided on the command line.
</p>
</dd>
</dl></div>
</div>
</div>
</div>
<div id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
Last updated 2014-11-17 20:26:04 EST
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