100 lines
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6.6 KiB
HTML
100 lines
No EOL
6.6 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<title>CLiki: xml-emitter</title>
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<link rel="alternate" type="application/atom+xml" title="ATOM feed of edits to current article"
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href="https://www.cliki.net/site/feed/article.atom?title=xml-emitter">
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<link rel="stylesheet" href="static/css/style.css">
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<link rel="stylesheet" href="static/css/colorize.css">
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</head>
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<body>
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<span class="hidden">CLiki - xml-emitter</span>
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<div id="content"><div id="content-area"><div id="article-title">xml-emitter</div><div id="article">Often, programs have to generate <a href="XML.html" class="category">XML</a> output. This is fairly easy, but
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not quite trivial. You need to do escaping, and indentation can be a
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little tricky to keep track of. One approach you could use is to get
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an XML parser/unparser like <a href="XMLS.html" class="internal">XMLS</a>, build your XML data structure in
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memory, then dump the whole thing. This is fairly easy, but not as
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easy as it could be, and it requires holding the whole structure in
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memory.<p>So, I wrote xml-emitter. xml-emitter simply emits XML, with some
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complexity for handling indentation. It can be used to produce all
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sorts of useful XML output; it has an <a href="RSS.html" class="category">RSS</a> 2.0 emitter built in, so you can make RSS feeds trivially.<p>There is no real home page, but you can download it from the
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<a href="http://common-lisp.net/project/asdf-packaging/">asdf-packaging project</a>. Or from the download link on this page.<p>If you have comments, questions, or bug reports, email them to <a href="Peter Scott.html" class="internal">Peter Scott</a> <a href="mailto:pscott@common-lisp.net"></a>.<p><b>Update (August 2015):</b><p><ul>
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<li>Now there is an official repository: <a href="https://github.com/VitoVan/xml-emitter">xml-emitter</a> maintained by Vito Van, feel free to submit issues and pull requests.</li>
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</ul><p>
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<h2>Usage</h2><p>The WITH-XML-OUTPUT macro wraps all XML output to a stream.<p>The WITH-TAG macro places the XML produced by its body inside a
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tag. Its output cannot be on just one line, since it puts starting and
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closing tags on their own lines.<p>The WITH-SIMPLE-TAG macro is like WITH-TAG, but starting and closing
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tags don't get their own lines.<p>XML-OUT prints its argument to the XML output stream, escaped.<p>XML-AS-IS prints its argument to the XML output stream, unescaped.<p>SIMPLE-TAG prints a simple <code><tag>value</tag></code> tag. It's a shortened
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version of a typical use of WITH-SIMPLE-TAG and XML-OUT.<p>EMIT-SIMPLE-TAGS takes a plist of tag names and tag values. For every
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tag with a non-NIL value, it prints the tag with SIMPLE-TAG. Tag names
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given as keyword symbols (like <code>:this</code>) are downcased.<p><b>Example:</b><p><pre>
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(with-xml-output (*standard-output*)
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(with-tag ("person" '(("age" "19")))
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(with-simple-tag ("firstName")
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(xml-out "Peter"))
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(simple-tag "lastName" "Scott")
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(emit-simple-tags :age 17
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:school "Iowa State Univeristy"
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"mixedCaseTag" "Check out the mixed case!"
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"notShown" nil)))
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</pre><p><h2>The RSS 2.0 emitter</h2><p>The WITH-RSS2 macro wraps up all output of RSS.<p>RSS-CHANNEL-HEADER outputs the RSS channel information.<p>RSS-ITEM outputs information about one RSS item.<p><b>Example:</b><p><pre>
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(with-rss2 (*standard-output*)
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(rss-channel-header "Peter's Blog" "http://peter.blogspot.com/"
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:description "A place where I sometimes post stuff"
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:image "myhead.jpg"
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:image-title "My glorious visage")
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(rss-item "Breaking news!"
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:link "http://google.com/"
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:description "The biggest problem with the DO-ODD macro above is that it puts BODY
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into LOOP. Code from the user of the macro should never be run in the
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environment established by the LOOP macro. LOOP does a number of
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things behind your back, and it's hard to disable them. For example,
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what happens here?"
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:author "Peter Scott"
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:category "Lisp"
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:pubDate "Sun, 29 Sep 2002 19:59:01 GMT")
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(rss-item "RSS emitter created"
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:description "An RSS emitter has been released! Hahahahaha!"
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:author "Peter Scott"
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:link "http://gmail.google.com/"))
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</pre><p>There is also a complete example of how you might use the RSS emitter
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in <tt>mailbox.lisp</tt> in the source distribution.</div></div>
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<div id="footer" class="buttonbar"><ul><li><a href="xml-emitter.html">Current version</a></li>
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<li><a href="https://www.cliki.net/site/history?article=xml-emitter">History</a></li>
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<li><a href="https://www.cliki.net/site/backlinks?article=xml-emitter">Backlinks</a></li><li><a href="https://www.cliki.net/site/edit-article?title=xml-emitter&from-revision=3686419757">Edit</a></li><li><a href="https://www.cliki.net/site/edit-article?create=t">Create</a></li></ul></div>
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<ul>
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<li><a href="https://www.cliki.net/">Home</a></li>
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<li><a href="https://www.cliki.net/site/recent-changes">Recent Changes</a></li>
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<li><a href="CLiki.html">About</a></li>
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<li><a href="Text Formatting.html">Text Formatting</a></li>
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<li><a href="https://www.cliki.net/site/tools">Tools</a></li>
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</ul>
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<div id="search">
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<form action="https://www.cliki.net/site/search">
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<span id="logo">CLiki</span>
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<span id="slogan">the common lisp wiki</span>
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