88 lines
3.8 KiB
HTML
88 lines
3.8 KiB
HTML
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<!-- This manual documents Guile version 3.0.10.
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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<title>Dia Steps (Guile Reference Manual)</title>
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Extending-Dia.html" rel="up" title="Extending Dia">
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<link href="Dia-Objects.html" rel="next" title="Dia Objects">
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<div class="subsubsection-level-extent" id="Dia-Steps">
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<p>
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Next: <a href="Dia-Objects.html" accesskey="n" rel="next">How to Represent Dia Data in Scheme</a>, Previous: <a href="Dia-Objective.html" accesskey="p" rel="prev">Deciding Why You Want to Add Guile</a>, Up: <a href="Extending-Dia.html" accesskey="u" rel="up">How One Might Extend Dia Using Guile</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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<hr>
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<h4 class="subsubsection" id="Four-Steps-Required-to-Add-Guile"><span>5.7.1.2 Four Steps Required to Add Guile<a class="copiable-link" href="#Four-Steps-Required-to-Add-Guile"> ¶</a></span></h4>
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<p>Assuming this objective, four steps are needed to achieve it.
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</p>
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<p>First, you need a way of representing your application-specific objects
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— such as <code class="code">shape</code> in the previous example — when they are
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passed into the Scheme world. Unless your objects are so simple that
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they map naturally into builtin Scheme data types like numbers and
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strings, you will probably want to use Guile’s <em class="dfn">foreign object</em>
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interface to create a new Scheme data type for your objects.
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</p>
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<p>Second, you need to write code for the basic operations like
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<code class="code">for-each-shape</code> and <code class="code">square?</code> such that they access and
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manipulate your existing data structures correctly, and then make these
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operations available as <em class="dfn">primitives</em> on the Scheme level.
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</p>
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<p>Third, you need to provide some mechanism within the Dia application
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that a user can hook into to cause arbitrary Scheme code to be
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evaluated.
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</p>
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<p>Finally, you need to restructure your top-level application C code a
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little so that it initializes the Guile interpreter correctly and
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declares your <em class="dfn">foreign objects</em> and <em class="dfn">primitives</em> to the Scheme
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world.
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</p>
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<p>The following subsections expand on these four points in turn.
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</p>
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