From 14025d22ce3d66c9d235e57221ec4653e00f972c Mon Sep 17 00:00:00 2001
From: Jedidiah Barber <contact@jedbarber.id.au>
Date: Fri, 26 Nov 2021 20:17:43 +1300
Subject: Switched to .xhtml extension, fixed some minor bugs

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 1 file changed, 105 deletions(-)
 delete mode 100644 project/templates/thue2a.html

(limited to 'project/templates/thue2a.html')

diff --git a/project/templates/thue2a.html b/project/templates/thue2a.html
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-
-{%- extends "base.html" -%}
-
-
-
-{%- block title -%}Thue Version 2a{%- endblock -%}
-
-
-
-{%- block content %}
-<h4>Thue Version 2a</h4>
-
-<p>Git repository: <a href="/cgi-bin/cgit.cgi/esoteric">Link</a></p>
-
-<h5>1/1/2017</h5>
-
-<p><a href="http://esolangs.org/wiki/Thue" class="external">Thue</a> is an esoteric programming
-language based on unrestricted grammars. A Thue program consists of a number of rules detailing a
-sequence of symbols to replace and a sequence of symbols to replace with, and an initial state of
-the program. Applicable rules are then applied to the inital state in a random order until no more
-are applicable, at which point the program terminates.</p>
-
-<p>An example Thue program that increments a binary number surrounded by '_' characters:</p>
-<div class="precontain">
-<code>
-1_::=1++
-0_::=1
-01++::=10
-11++::=1++0
-_0::=_
-_1++::=10
-::=
-_1111111_
-</code>
-</div>
-
-<p>The before and after symbols in each rule are separated by '::=' and the list of rules is ended
-by a blank rule. Note that whitespace in rules and the inital state is NOT ignored.</p>
-
-<p>Output is handled by prefixing the right hand side with '~', which causes those symbols to go to
-stdout and the replacement in the program to be the empty string.</p>
-
-<p>The traditional Hello World program:</p>
-<div class="precontain">
-<code>
-a::=~Hello World!
-::=
-a
-</code>
-</div>
-
-<p>Input is handled by having the right hand side of a rule be ':::', which causes the left hand
-side symbols to be replaced with a line from the standard output. Unfortunately, this immediately
-causes problems.</p>
-
-<p>The following is an innocent piece of code that accepts a single line of input and does nothing
-more. Maybe.</p>
-<div class="precontain">
-<code>
-a::=:::
-::=
-a
-</code>
-</div>
-
-<p>If a string involving the letter 'a' is entered into the above program, the single input rule
-will again become applicable and another line of input will be obtained. In other words, the input
-in Thue is unescaped and allows direct code injection into a program.</p>
-
-<p>To solve this problem, I've constructed a slightly modified version of Thue that I'm calling
-version 2a. In this version, all symbols obtained through stdin are treated as different from
-ordinary symbols. Rules can refer to and manipulate symbols obtained through stdin by surrounding
-them in double quotes.</p>
-
-<p>A rule that replaces an ordinary symbol 'a' with 'abc':</p>
-<div class="precontain">
-<code>
-a::=abc
-</code>
-</div>
-
-<p>A rule that replaces the letter 'a' that was obtained from stdin with 'abc':</p>
-<div class="precontain">
-<code>
-"a"::=abc
-</code>
-</div>
-
-<p>For convenience, a number of escaped characters are also available:</p>
-<div class="precontain">
-<pre>
-\\ -> backslash
-\r -> return
-\n -> newline
-\: -> colon
-\" -> double quote
-\EOT -> end of file
-</pre>
-</div>
-
-<p>While this doesn't solve all the problems Thue has (try writing a Thue program that asks for and
-greets the user by name!) it should solve this one particular issue.</p>
-{% endblock -%}
-
-
-- 
cgit