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+
+{%- extends "base.xhtml" -%}
+
+
+
+{%- block title -%}Grasp Interpreter{%- endblock -%}
+
+
+
+{%- block content %}
+<h4>Grasp Interpreter</h4>
+
+<p>Git repository: <a href="/cgi-bin/cgit.cgi/esoteric">Link</a></p>
+
+<h5>1/1/2017</h5>
+
+<p>Like Lisp, the esoteric programming language <a href="http://esolangs.org/wiki/Grasp"
+class="external">Grasp</a> is a homoiconic language that exclusively uses a single datatype. Except
+instead of lists, it uses directed graphs.</p>
+
+<p>A Grasp program is initialised with instruction pointers to those nodes in the graph that have
+a "name" edge to a node with the value "grasp:main". The nodes at each instruction pointer are
+evaluated and the pointer then updated by following an available "next" edge. This continues until
+all instruction pointers have no more "next" edges to follow.</p>
+
+<div class="figure">
+    <img src="/img/grasp_helloworld.png"
+         alt="Hello World in Grasp"
+         height="176"
+         width="268" />
+    <div class="figcaption">Hello World in Grasp</div>
+</div>
+
+<p>In the <a href="https://github.com/fis/grajsp/wiki/Grasp-specification" class="external">current
+specification</a>, the actions that can be performed are:</p>
+
+<ul>
+    <li>Add or delete an edge</li>
+    <li>Change the value of a node</li>
+    <li>Add, subtract, multiply, divide, or modulo node values</li>
+    <li>Call and return from functions, which take the form of subgraphs with named entry points
+    </li>
+    <li>Read and write from arbitrary file handles</li>
+    <li>Push, pop and pick a section of nodes arranged to act as a stack</li>
+</ul>
+
+<p>The execution of a node may be skipped by having "cond" edges pointing to either zero values or
+non-numeric values. Also, due to the way instruction pointers update and the way several
+instructions are defined, there is a measure of non-determinism that can be introduced depending on
+what edges are available.</p>
+
+<p>The language seemed like an interesting enough idea, but unfortunately nobody had done anything
+with it, and there was only a specification. This has now been fixed. The interpreter currently
+uses a subset of the <a href="http://www.graphviz.org/doc/info/lang.html" class="external">DOT graph
+description language</a> for the file format, to enable a text format as well as relatively easy
+conversion to a graph image.</p>
+
+<p>The above example is recorded as follows:</p>
+<div class="precontain">
+<code>
+digraph {
+    1 [label="puts"]
+    2 [label="grasp:main"]
+    3 [label="Hello world!"]
+
+    1 -> 2 [label="name"]
+    1 -> 3 [label="in"]
+}
+</code>
+</div>
+
+<p>If a format that more readily converts to a comprehensible graph image is found, a parser for it
+may be added.</p>
+{% endblock -%}
+
+