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<p>
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<hr>
<span id="Source-Code-File-1"></span><h3 class="section">9.6 Source Code File</h3>
<span id="index-_002est"></span>
<span id="index-_002epck_002est"></span>
<span id="index-file-extension"></span>
<span id="index-file-extension-1"></span>
<p>In this chapter, you encountered files produced by the Cuis-Smalltalk
management tools. Some come with the extension <samp>.pck.st</samp> and
others with the extension <samp>.st</samp>. They both contain Smalltalk code
but serve different purposes.
</p>
<p>Files with extension <samp>.pck.st</samp> are Cuis-Smalltalk package files. They
have a preamble with package information, like feature provided,
version information, a description for the package and the package
requirements.
</p>
<p>Smalltalk code files can be installed by selecting them in the File List Browser
and clicking on <code>install</code> button.
</p><p>When a package is installed, its dependencies are
also installed and the loaded packaged appears in the Package List
tool. Package files <samp>.pck.st</samp> are created using the Packages List
tool in Cuis-Smalltalk.
</p>
<p>Files with extension <samp>.st</samp> contained serialized Smalltalk code –
classes and methods. They are created when you <em>file out</em> a
Smalltalk system category, class or method. You can serialize code in the
<em>System Browser</em> by selecting a <strong>system category</strong>,
<strong>class</strong> or <strong>method</strong> → right click and
select <code>fileOut</code> from the context menu.
</p>
<p>Unlike <samp>.pck.st</samp> files, <samp>.st</samp> files don’t contain any
dependencies, description, or package information, simply serialized
Smalltalk code. <samp>.st</samp> files are around since Smalltalk’s early
days, while <samp>.pkg.st</samp> were added with the Cuis-Smalltalk package
functionality.
</p>
<p>
In addition to <em>install</em>, selecting a code file in the File List Browser
also adds buttons to inspect the code and to treat code contents like a Change Sorter.
</p>
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