Channels ▼

Web Development

squeam.txt

Associated article: Prototyping Interpreters using Python Lex-Yacc

Tags: Web Development         

Published source code accompanying the article by Shannon Behrens in which, to test the Python and PLY environment, he wrote a language called Squeamish that consists of only 850 lines of code. Also see SQUEAM.ZIP.

					Prototyping Interpreters using Python Lex-Yacc
by Shannon Behrens

Example 1:
def p_list(t):
    'list : LPAREN nodes RPAREN'    
    #^     ^       ^     ^          This comment is for illustration only.
    #t[0]  t[1]    t[2]  t[3]
    t[0] = t[2]



Listing One

"""This file contains the lexer rules ...							
										
To continue reading Log In or Register




Currently we allow the following HTML tags in comments:

Single tags

These tags can be used alone and don't need an ending tag.

<br> Defines a single line break

<hr> Defines a horizontal line

Matching tags

These require an ending tag - e.g. <i>italic text</i>

<a> Defines an anchor

<b> Defines bold text

<big> Defines big text

<blockquote> Defines a long quotation

<caption> Defines a table caption

<cite> Defines a citation

<code> Defines computer code text

<em> Defines emphasized text

<fieldset> Defines a border around elements in a form

<h1> This is heading 1

<h2> This is heading 2

<h3> This is heading 3

<h4> This is heading 4

<h5> This is heading 5

<h6> This is heading 6

<i> Defines italic text

<p> Defines a paragraph

<pre> Defines preformatted text

<q> Defines a short quotation

<samp> Defines sample computer code text

<small> Defines small text

<span> Defines a section in a document

<s> Defines strikethrough text

<strike> Defines strikethrough text

<strong> Defines strong text

<sub> Defines subscripted text

<sup> Defines superscripted text

<u> Defines underlined text

Dr. Dobb's encourages readers to engage in spirited, healthy debate, including taking us to task. However, Dr. Dobb's moderates all comments posted to our site, and reserves the right to modify or remove any content that it determines to be derogatory, offensive, inflammatory, vulgar, irrelevant/off-topic, racist or obvious marketing or spam. Dr. Dobb's further reserves the right to disable the profile of any commenter participating in said activities.

 
Disqus Tips To upload an avatar photo, first complete your Disqus profile. | View the list of supported HTML tags you can use to style comments. | Please read our commenting policy.
 

Dr. Dobb's TV