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<h3 class="section">3.1 Basics</h3>

<p><code>Sketch</code> input is plain ASCII text, usually stored in an input
file. 
<a name="index-input-file-159"></a><a name="index-file_002c-input-160"></a>It describes a <dfn>scene</dfn>,
so the sketch language is a <dfn>scene description
language</dfn>. 
<a name="index-scene-description-language-161"></a><a name="index-language_002c-scene-description-162"></a><code>Sketch</code> input is also <dfn>declarative</dfn>. 
<a name="index-declarative-language-163"></a><a name="index-language_002c-declarative-164"></a>It merely
declares what the scene ought to look like when drawing is complete
and says very little about how <code>sketch</code> should do its work. 
<code>Sketch</code> commands are not executed sequentially as in the usual
programming language.  They merely contribute to that declaration.

   <p>A few syntactic details are important.  Case is significant in the
<code>sketch</code> language.  With a few exceptions, white space is not. 
This includes line breaks. 
<a name="index-white-space-165"></a>Comments begin with <code>%</code> or <code>#</code> and extend to the end of the
line.  You can disable a chunk of syntactically correct <code>sketch</code>
code by enclosing it in a <code>def</code>. 
<a name="index-comments-166"></a>There is a simple &ldquo;include file&rdquo; mechanism. 
<a name="index-include-file-167"></a><a name="index-file_002c-include-168"></a>The command
<a name="index-input-169"></a>
<pre class="verbatim">  input{otherfile.sk}
</pre>
causes the contents of <samp><span class="file">otherfile.sk</span></samp> to be inserted as though
they were part of the current file.

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<li><a accesskey="1" href="Identifiers.html#Identifiers">Identifiers</a>:                  Names for things. 
<li><a accesskey="2" href="Key-and-reserved-words.html#Key-and-reserved-words">Key and reserved words</a>:       Names you shouldn't use. 
<li><a accesskey="3" href="Literals.html#Literals">Literals</a>:                     Constants and constructors. 
<li><a accesskey="4" href="Arithmetic.html#Arithmetic">Arithmetic</a>:                   Rules for expressions. 
<li><a accesskey="5" href="Options.html#Options">Options</a>:                      Modifying object appearance. 
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sketch-doc 1:0.3.7-1 / usr / share / doc / sketch-doc / sketch / Language-basics.html
