TANGLE(1)TANGLE(1)NAMEtangle - translate WEB to Pascal
SYNOPSIStangle [ options ] webfile[.web] [ changefile[.ch] ]
DESCRIPTION
This manual page is not meant to be exhaustive. The com-
plete documentation for this version of TeX can be found
in the info file or manual Web2C: A TeX implementation.
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 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 pro-
duce 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 exten-
sion). 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.
OPTIONS
This version of tangle understands the following options.
Note that some of these options may render the output
unsuitable for processing by a Pascal compiler.
--help Print help message and exit.
--length number
Compare only the first number characters of identi-
fiers when checking for collisions. The default is
32, the original tangle used 7.
--loose
When checking for collisions between identifiers,
honor the settings of the --lowercase, --mixedcase,
--uppercase, and --underline options. This is the
default.
--lowercase
Convert all identifiers to lowercase.
--mixedcase
Retain the case of identifiers. This is the
default.
--strict
When checking for collisions between identifiers,
strip underlines and convert all identifiers to
uppercase first.
--underline
Retain underlines (also known as underscores) in
identifiers.
--uppercase
Convert all identifiers to uppercase. This is the
behaviour of the original tangle.
--version
Print version information and exit.
SEE ALSOpc(1), pxp(1) (for formatting tangle output when debug-
ging), tex(1).
Donald E. Knuth, The Web System of Structured Documenta-
tion.
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 Com-
puters and Typesetting), Addison-Wesley, 1986, ISBN
0-201-13438-1.
These last two are by far the largest extant examples of
Web programs.
There is an active Internet electronic mail discussion
list on the subject of literate programming; send a sub-
scription 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.
Web2C 7.4.5 20 October 2002 TANGLE(1)
