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-
-{%- extends "base.html" -%}
-
-
-
-{%- 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 -%}
-
-