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<title>Search</title><meta name="generator" content="DocBook XSL Stylesheets V1.77.1"></meta><link rel="home" href="index.html" title="README: Web-based Help from DocBook XML"></link><link rel="up" href="ch03.html" title="Developer Docs"></link><link rel="prev" href="ch03s01.html" title="Design"></link><link rel="next" href="ch03s02s01.html" title="New Stemmers"></link><script type="text/javascript">
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input {
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.folder {
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    padding-left: 20px;
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span.searchTab {
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}    
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.ui-tabs { padding: .2em;}
.ui-tabs .ui-tabs-nav li { top: 0px; margin: -2px 0 1px; text-transform: uppercase; font-size: 10.5px;}
.ui-tabs .ui-tabs-nav li a { padding: .25em 2em .25em 1em; margin: .5em; text-shadow: 0 1px 0 rgba(255,255,255,.5); }
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                                    <a accesskey="n" class="navLinkNext" tabindex="5" href="ch03s02s01.html">Next</a></td></tr></table></div></div><div id="content"><noscript>JavaScript is disabled on your browser. Please enable JavaScript to enjoy all the features of this site.</noscript><div class="section"><div xmlns="" class="titlepage"><div><div><h2 xmlns="http://www.w3.org/1999/xhtml" class="title" style="clear: both"><a id="id377151"></a>Search</h2></div></div></div>
<div class="toc"><dl><dt><span class="section"><a href="ch03s02s01.html">New Stemmers</a></span></dt></dl></div><p class="summary">Overview design of Search mechanism.</p><p>The serching is a fully client-side implementation of querying texts for content
        searching. There's no server involved. So, the search queries by the users are processed by
        JavaScript inside the browser, and displays the matching results by comparing the query with
        a simplified 'index' that too resides in JavaScript. Mainly the search mechanism has two
        parts. </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>Indexing: First we need to traverse the content in the docs/content folder and
              index the words in it. This is done by <code class="filename">webhelpindexer.jar</code> in
                <code class="filename">xsl/extentions/</code> folder. You can invoke it by <code class="code">ant
                index</code> command from the root of webhelp of directory. The source of
              webhelpindexer is now moved to it's own location at
                <code class="filename">trunk/xsl-webhelpindexer/</code>. Checkout the Docbook trunk svn
              directory to get this source. Then, do your changes and recompile it by simply running
                <code class="code">ant</code> command. My assumption is that it can be opened by Netbeans IDE by
              one click. Or if you are using IntelliJ Idea, you can simply create a new project from
              existing sources. Indexer has extensive support for features such as word scoring,
              stemming of words, and support for languages English, German, French. For CJK
              (Chinese, Japanese, Korean) languages, it uses bi-gram tokenizing to break up the
              words (since CJK languages does not have spaces between words).</p><p> When <code class="code">ant index</code> is run, it generates five output files: </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; "><li class="listitem"><p><code class="filename">htmlFileList.js</code> - This contains an array named
                      <code class="code">fl</code> which stores details all the files indexed by the indexer.
                    Further, the doStem in it defines whether stemming should be used. It defaults
                    to false.</p></li><li class="listitem"><p><code class="filename">htmlFileInfoList.js</code> - This includes some meta data
                    about the indexed files in an array named <code class="code">fil</code>. It includes details
                    about file name, file (html) title, a summary of the content.Format would look
                    like, <code class="code">fil["4"]= "ch03.html@@@Developer Docs@@@This chapter provides an
                      overview of how webhelp is implemented.";</code>
                  </p></li><li class="listitem"><p><code class="filename">index-*.js</code> (Three index files) - These three files
                    actually stores the index of the content. Index is added to an array named
                      <code class="code">w</code>.</p></li></ul></div></li><li class="listitem"><p> Querying: Query processing happens totally in client side. Following JavaScript
              files handles them. </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; "><li class="listitem"><p><code class="filename">nwSearchFnt.js</code> - This handles the user query and
                    returns the search results. It does query word tokenizing, drop unnecessary
                    punctuations and common words, do stemming if docbook language supports it,
                    etc.</p></li><li class="listitem"><p><code class="filename">{$indexer-language-code}_stemmer.js</code> - This includes the
                    stemming library. <code class="filename">nwSearchFnt.js</code> file calls
                      <code class="code">stemmer</code> method in this file for stemming. ex: <code class="code">var stem =
                      stemmer(foobar);</code>
                  </p></li></ul></div><p>
            </p></li></ul></div><p>
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