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authorKarl Berry <karl@freefriends.org>2010-09-22 23:41:46 +0000
committerKarl Berry <karl@freefriends.org>2010-09-22 23:41:46 +0000
commit199d894c05a768c3644e34abc3b01f3025cb3e62 (patch)
tree67a8b664531be05a5fda1331a10833055206f5f1 /Master/texmf-dist/tex/latex/ltxmisc
parent078d7bd41f1e0477ea74a1d51ffee1888e09ca7a (diff)
rm ltxmisc file
git-svn-id: svn://tug.org/texlive/trunk@19850 c570f23f-e606-0410-a88d-b1316a301751
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-%%% @LaTeX-style-file
-%%% {
-%%% author = "Philip Taylor",
-%%% version = "3.03b",
-%%% date = "22 July 1997",
-%%% time = "15:59:31 BST",
-%%% filename = "path.sty",
-%%% address = "The Computer Centre
-%%% RHBNC, University of London
-%%% Egham Hill
-%%% Egham, Surrey TW20 0EX, ENGLAND",
-%%% telephone = "Tel: +44 1784 443172",
-%%% FAX = "Fax: +44 1784 434348",
-%%% email = "P.Taylor@Vms.Rhbnc.Ac.Uk",
-%%% codetable = "ISO/ASCII",
-%%% keywords = "file name, filename, path name, pathname,
-%%% discretionary, discretionaries",
-%%% supported = "yes",
-%%% docstring = {Computer filenames, host names, and e-mail
-%%% addresses tend to be long strings that
-%%% cause line breaking problems for TeX.
-%%% Sometimes rather long strings are
-%%% encountered, such as:
-%%%
-%%% mighty-mouse-gw.scrc.symbolics.com
-%%%
-%%% This file defines a macro, \path|...|,
-%%% similar to LaTeX's \verb|...| macro, that
-%%% sets the text in the typewriter font,
-%%% allowing hyphen-less line breaks at
-%%% punctuation characters.
-%%%
-%%% The default set of punctuation characters is
-%%% defined as
-%%%
-%%% \discretionaries |~!@$%^&*()_+`-=#{"}[]:;'<>,.?\/|
-%%%
-%%% However, you can change it as needed, for
-%%% example
-%%%
-%%% \discretionaries +@%!.+
-%%%
-%%% would assign to it the set @ % ! . which
-%%% commonly occur in electronic mail addresses.
-%%%
-%%% The delimiter characters surrounding the
-%%% arguments to \discretionaries and \path
-%%% will normally be a punctuation character not
-%%% found in the argument, and not otherwise
-%%% significant to TeX. In particular, backslash
-%%% cannot be used as a delimiter. In the rare
-%%% event that this is required, set
-%%%
-%%% \specialpathdelimiterstrue
-%%%
-%%% This practice is not recommended, because TeX
-%%% then runs about four times slower while it is
-%%% typesetting \path\...\ requests.
-%%% \specialpathdelimitersfalse is the normal
-%%% setting.
-%%%
-%%% This file may be used in Plain TeX or AmSTeX
-%%% by
-%%%
-%%% \input path.sty
-%%%
-%%% and in LaTeX by
-%%%
-%%% \usepackage {path}
-%%%
-%%% The checksum field above, if present, contains
-%%% a CRC-16 checksum as the first value, followed
-%%% by the equivalent of the standard UNIX wc (word
-%%% count) utility output of lines, words, and
-%%% characters. This is produced by Robert
-%%% Solovay's checksum utility.
-%%% }
-%%% }
-%%% ====================================================================
-
-% ======================================================================
-%
-% The \path Macro
-%
-% An early prototype of this code which was developed by Nelson H. F.
-% Beebe <beebe@math.utah.edu> used a recursive macro to peel off one
-% character at a time, then with a nest of \ifx statements, test for
-% each punctuation character, and if one is found, insert discretionary
-% linebreaks in the form of \- or \penalty0. While this usually works,
-% it is not entirely satisfactory, because the nested \ifx statements
-% are ugly, and the recursion can exhaust TeX's macro stack for
-% arguments longer than about 30 characters.
-%
-% A second version by NHFB built upon the ideas used by the LaTeX
-% \verb|...| macro; this was mostly successful, but was flawed by its
-% inability to handle at least the three characters ^ [ ], by loss of
-% use of @ for naming internal private macros, and by its inability to
-% allow the set of characters at which breaks are permissible.
-%
-% The problem was then passed off to Philip Taylor, who wrote this third
-% version which fully solves the problem. Phil therefore gets the
-% author credit in the file header above. [Gee, thanks ! ** Phil]
-%
-% Revision history (reverse time order):
-%
-% 3.03b [22-Jul-1997]
-% Summary: No code changes. An out-of-date example removed, the syntax
-% for LaTeX2e changed to "\usepackage {path}", and the "checksum"
-% comments modified to indicate that the checksum is not necessarily
-% present. The initial opening brace re-positioned to align
-% with the matching closing brace, and the inner closing brace
-% re-positioned to align with the inner opening brace. A check made
-% to ensure that no <tab> characters are present.
-%
-% 3.03a [22-Jul-1997]
-% Summary: No code changes from V3.03; e-mail addresses, telephone numbers,
-% etc. amended to reflect current situation. Checksum removed.
-%
-% 3.03 [03-Dec-1991]
-% Problem: A \path|...| entry in a LaTeX index is set with an
-% preceding blank line.
-% Solution: Add \leavevmode before \hbox{}; without it, an extra blank
-% line gets typeset before every invocation of \path in a
-% LaTeX theindex environment.
-% Diagnosis: To avoid hyphenation, the expansion of \path starts with
-% an \hbox{} (c.f. the TeXbook, p. 454); LaTeX indices are
-% basically set in vertical mode, with each index entry a
-% paragraph in its own right; when an \hbox {} is
-% encountered in vmode, it is typeset in vmode, and TeX
-% continues; the first real character is encountered, and
-% TeX enters unrestricted horizontal mode. The \hbox {} and
-% the first character are therefore on separate lines,
-% separated by \baselineskip.
-%
-% 3.02 [23-Oct-1991 13:45:12]
-% First released version.
-% ======================================================================
-
-\immediate\write16{This is path.sty, Version 3.03 <03-Dec-1991>}
-
-%%% We will regrettably need one \count variable with an open name,
-%%% in which to save the category code of commercial-at ...
-
-\newcount \ATcode
-\ATcode = \catcode `\@
-
-%%% Make commercial-at a letter to provide concealed control sequences
-
-\catcode `\@ = 11
-
-%%% and then declare two \count variables with concealed names
-
-\newcount \c@tcode
-\newcount \c@unter
-
-%%% and a boolean variable with an open name, to specify the nature of
-%%% the delimiters which will be associated with the \path command
-
-\newif \ifspecialpathdelimiters
-
-%%% We need to define control sequences which expand to both
-%%% active and passive spaces ...
-
-\begingroup
-\catcode `\ = 10
-\gdef \passivesp@ce { }
-\catcode `\ = 13\relax%
-\gdef\activesp@ce{ }%
-\endgroup
-
-%%% \discretionaries will define a macro \discr@ti@n@ri@s which will
-%%% make every character between the first and final <delim> a
-%%% discretionary breakpoint.
-
-\def \discretionaries %%% <delim> <chars> <delim>
- % start a group (ended in \discr@ti@naries ),
- % make every character (apart from space) active,
- % then transfer control to \discr@tionaries ...
- {\begingroup
- \c@tcodes = 13
- \discr@tionaries
- }
-
-%%% \discr@tionaries will receive as parameter the initial <delim>
-%%% which will delimit the set of discretionaries; this <delim>
-%%% will be active.
-
-\def \discr@tionaries #1%%% <delim>
- % knowing the initial <delim>, define \discr@ti@naries with a
- % delimited parameter structure, the final delimiter being
- % the second instance of <delim>
- {\def \discr@ti@naries ##1#1%%% <chars> <delim>
- % \discr@ti@naries will receive as parameter the set of
- % characters which are to be made discretionaries; it ends the
- % group and then defines \discr@ti@n@ries, a tail-recursive
- % macro, which will quietly process each of the
- % discretionaries in turn ...
- {\endgroup
- \def \discr@ti@n@ries ####1%%% <char> or <delim>
- % by checking to see if it has reached the end of the
- % list, i.e. comparing its parameter with the known final
- % <delim> ...
- {\if \noexpand ####1\noexpand #1%
- % if they match, there is no more to do ...
- \let \n@xt = \relax
- \else
- % otherwise the character becomes active and is
- % defined as a discretionary with the three texts
- % <self> <empty> <self>, thus suppressing true
- % hyphenation; the macro then prepares to process
- % the next character.
- \catcode `####1 = 13
- \def ####1{\discretionary
- {\char `####1}{}{\char `####1}}%
- \let \n@xt = \discr@ti@n@ries
- \fi
- % here either tail recursion occurs, if there are more
- % characters to process, or tail recursion ceases if all
- % have been exhausted
- \n@xt
- }%
- % of course, none of this must take place during the \stress
- % {call} of \discretionaries; execution is deferred until
- % another macro such as \path calls the concealed action
- % macro \discr@ti@n@ri@s; we therefore define this macro to
- % have the desired effect.
- \def \discr@ti@n@ri@s {\discr@ti@n@ries ##1#1}%
- }%
- % and finally invoke \discr@ti@naries to process the set of
- % discretionary characters; it will take everything up to the
- % second instance of <delim> as its parameter (and therefore as the
- % set of characters to be processed).
- \discr@ti@naries
- }
-
-%%% \path, which is the user interface to \p@th, first checks
-%%% to see whether \specialpathdelimiters is <true> or <false>;
-%%% if <true>, it needs to take special action to ensure that
-%%% \stress {all} characters (apart from <space>) are acceptable
-%%% as delimiters; this is very time-consuming, and should be
-%%% avoided if at all possible. It also defines \endp@th, to
-%%% close the appropriate number of groups, and finally transfers
-%%% control to \p@th
-
-\def \path
- {\ifspecialpathdelimiters
- \begingroup
- \c@tcodes = 12
- \def \endp@th {\endgroup \endgroup}%
- \else
- \let \endp@th = \endgroup
- \fi
- \p@th
- }
-
-%%% \p@th, which has essentially the same syntax as \discretionaries,
-%%% expects to be followed by a <delim>, a <path>, and a second instance
-%%% of <delim>; it will typeset <path> in the \tt font with hyphenation
-%%% inhibited --- breaks (but not true hyphenation) are allowed at any
-%%% or all of the special characters which have
-%%% previously been declared as \discretionaries.
-
-\def \p@th #1%%% <delim>
- % it starts by opening a group (ended in \p@@th) ...
- % switches to \tt, and inhibits hyphenation;
- % allows breaks at \discretionaries; saves the
- % catcode of the initial <delim>, because if it has also been
- % declared within \discretionaries, the initial and final <delim>
- % won't match (which would be a disaster); \c@tcode is overloaded,
- % but there is no conflict that I can detect ...
- % invokes \discr@ti@n@ri@s to render active the set of special
- % characters which have previously been declared as
- % \discretionaries; each of these characters will expand to a real
- % \discretionary, with replacement texts <self> <null> <self>; and
- % re-instates the catcode of the initial <delim>.
- {\begingroup
- \tt
- \c@tcode = \catcode `#1
- \discr@ti@n@ri@s
- \catcode `\ = \active
- \expandafter \edef \activesp@ce {\passivesp@ce \hbox {}}%
- \catcode `#1 = \c@tcode
- % it next defines an inner macro \p@@th with delimited parameter
- % structure, the final delimiter being the same as the initial
- % delimiter which it has itself received as #1.
- \def \p@@th ##1#1% <chars> <delim>
- % Within \p@@th,
- % permissible breakpoints are specified,
- % the path is typeset,
- % and the group(s) ended.
- {\leavevmode \hbox {}##1%
- \endp@th
- }%
- \p@@th
- }
-
-%%% \c@tcodes expects to be followed by the r-h-s of a numeric
-%%% assignment optionally including the assignment operator; it saves
-%%% the value of the r-h-s in \c@tcode, and invokes \c@tc@des.
-
-\def \c@tcodes {\afterassignment \c@tc@des \c@tcode}
-
-%%% \c@tc@des uses the value saved in \c@tcode, and assigns it to the
-%%% \catcode of all characters with the single exception of <space>,
-%%% which retains its normal catcode of 10; on exit, every single
-%%% character apart from <space> will have the catcode which followed
-%%% \c@tcodes. The code is optimised to avoid unnecessary usage of
-%%% save-stack space.
-
-\def \c@tc@des
- {\c@unter = 0
- \loop
- \ifnum \catcode \c@unter = \c@tcode
- \else
- \catcode \c@unter = \c@tcode
- \fi
- \ifnum \c@unter < 255
- \advance \c@unter by 1
- \repeat
- \catcode `\ = 10
- }
-
-%%% We restore the original catcode of commercial-at
-
-\catcode `\@ = \ATcode
-
-%%% Define a default set of discretionary break characters
-%%% to include all punctuation characters except vertical
-%%% bar
-
-\discretionaries |~!@$%^&*()_+`-=#{}[]:";'<>,.?\/|
-
-\endinput