TANGLE(1) TANGLE(1)
12 February 1993
NAME
tangle - translate WEB to Pascal
SYNOPSIS
tangle webfile[.web] [ changefile[.ch] ]
DESCRIPTION
The tangle program converts a Web source document into a Pascal
program that may be compiled in the usual way with the on-line Pascal
compiler (e.g., pc(1)). The output file is all in lower case and
packed into lines of 72 characters or less, with the only concession
to readability being the termination of lines at semicolons when this
can be done conveniently.
The Web language allows you to prepare a single document containing
all the information that is needed both to produce a compilable Pascal
program and to produce a well-formatted document describing the
program in as much detail as the writer may desire. The user of Web
must be familiar with both TeX and Pascal. Web also provides a
relatively simple, although adequate, macro facility that permits a
Pascal program to be written in small easily-understood modules.
The command line should have either one or two names on it. The first
is taken as the Web file (and .web is added if there is no extension).
If there is another name, it is a change file (and .ch is added if
there is no extension). The change file overrides parts of the Web
file, as described in the Web system documentation.
The output files are a Pascal file and a string pool file, whose names
are formed by adding .p and .pool respectively to the root of the Web
file name.
SEE ALSO
pc(1), pxp(1) (for formatting tangle output when debugging), tex(1).
Donald E. Knuth, The Web System of Structured Documentation.
Donald E. Knuth, Literate Programming, Computer Journal 27, 97-111,
1984.
Wayne Sewell, Weaving a Program, Van Nostrand Reinhold, 1989, ISBN 0-
442-31946-0.
Donald E. Knuth, TeX: The Program (Volume B of Computers and
Typesetting), Addison-Wesley, 1986, ISBN 0-201-13437-3.
Donald E. Knuth, Metafont: The Program (Volume D of Computers and
Typesetting), Addison-Wesley, 1986, ISBN 0-201-13438-1.
These last two are by far the largest extant examples of Web programs.
- 1 - Formatted: October 7, 1998
TANGLE(1) TANGLE(1)
12 February 1993
There is an active Internet electronic mail discussion list on the
subject of literate programming; send a subscription request to
litprog-request@shsu.edu to join.
AUTHORS
Web was designed by Donald E. Knuth, based on an earlier system called
DOC (implemented by Ignacio Zabala). The tangle and weave programs
are themselves written in Web. The system was originally ported to
Unix at Stanford by Howard Trickey, and at Cornell by Pavel Curtis.
- 2 - Formatted: October 7, 1998