
diff -r 13293a7d4a57 -r 010dfaf75064 doc-src/url.sty
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/doc-src/url.sty	Mon May 10 15:17:14 1999 +0200
@@ -0,0 +1,268 @@
+% url.sty  ver 1.1    6-Feb-1996   Donald Arseneau   asnd@triumf.ca
+%
+% A form of \verb that allows linebreaks at certain characters or 
+% combinations of characters, accepts reconfiguration, and can usually
+% be used in the argument to another command.  It is intended for email
+% addresses, hypertext links, directories/paths, etc., which normally 
+% have no spaces.  The font may be selected using the \urlstyle command, 
+% and new url-like commands can be defined using \urldef.
+%
+% Usage:    Conditions:
+% \url{ }   If the argument contains any "%", "#", or "^^", or ends with
+%           "\", it can't be used in the argument to another command.  
+%           The argument must not contain unbalanced braces.
+% \url|  |  ...where "|" is any character not used in the argument and not 
+%           "{".  The same restrictions as above except that the argument
+%           may contain unbalanced braces.
+% \xyz      for "\xyz" a defined-url;  this can be used anywhere, no matter
+%           what characters it contains.
+% 
+% See further instructions after "\endinput"
+
+\def\url@ttstyle{%
+\@ifundefined{selectfont}{\def\UrlFont{\tt}}{\def\UrlFont{\ttfamily}}% 
+\def\UrlBreaks{\do\.\do\@\do\\\do\/\do\!\do\_\do\|\do\%\do\;\do\>\do\]%
+ \do\)\do\,\do\?\do\'\do\+\do\=\do@url@hyp}%
+\def\UrlBigBreaks{\do\:}%
+\def\UrlNoBreaks{\do\(\do\[\do\{\do\<}% (unnecessary)
+\def\UrlSpecials{\do\ {\ }}%
+\def\UrlOrds{\do\*\do\-}% any ordinary characters that aren't usually
+}
+\def\url@rmstyle{%
+\@ifundefined{selectfont}{\def\UrlFont{\rm}}{\def\UrlFont{\rmfamily}}% 
+\def\UrlBreaks{\do\.\do\@\do\/\do\!\do\%\do\;\do\]\do\)\do\,\do\?\do@url@hyp
+  \do\+\do\=}%
+\def\UrlBigBreaks{\do\:}%
+\def\UrlNoBreaks{\do\(\do\[\do\{}% prevents breaks after *next* character
+\def\UrlSpecials{\do\<{\langle}\do\>{\rangle\penalty\relpenalty}\do\_{\_%
+ \penalty\@m}\do\|{\mid}\do\{{\lbrace}\do\}{\rbrace\penalty\relpenalty}\do
+ \\{\mathbin{\backslash}}\do\~{\mathord{{}^{\textstyle\sim}}}\do\ {\ }}%
+\def\UrlOrds{\do\'\do\"\do\-}%
+}
+\def\url@sfstyle{\url@rmstyle 
+\@ifundefined{selectfont}{\def\UrlFont{\sf}}{\def\UrlFont{\sffamily}}% 
+}
+\def\url@samestyle{\ifdim\fontdimen\thr@@\font=\z@ \url@ttstyle \else
+  \url@rmstyle \fi \def\UrlFont{}}
+
+\def\do@url@hyp{}% by default, no breaks after hyphens
+
+\@ifundefined{strip@prefix}{\def\strip@prefix#1>{}}{}
+\@ifundefined{verbatim@nolig@list}{\def\verbatim@nolig@list{\do\`}}{}
+
+\def\Url{\relax\ifmmode\@nomatherr$\fi 
+ \UrlFont $\fam\z@ \textfont\z@\font 
+ \let\do\@makeother \dospecials % verbatim catcodes
+ \catcode`{\@ne \catcode`}\tw@ % except braces 
+ \medmuskip0mu \thickmuskip\medmuskip \thinmuskip\medmuskip
+ \@tempcnta\fam\multiply\@tempcnta\@cclvi 
+ \let\do\set@mathcode \UrlOrds % ordinary characters that were special
+ \advance\@tempcnta 8192 \UrlBreaks % bin
+ \advance\@tempcnta 4096 \UrlBigBreaks % rel
+ \advance\@tempcnta 4096 \UrlNoBreaks % open
+ \let\do\set@mathact \UrlSpecials % active
+ \let\do\set@mathnolig \verbatim@nolig@list % prevent ligatures 
+ \@ifnextchar\bgroup\Url@z\Url@y}
+
+\def\Url@y#1{\catcode`{11 \catcode`}11
+  \def\@tempa##1#1{\Url@z{##1}}\@tempa}
+\def\Url@z#1{\def\@tempa{#1}\expandafter\expandafter\expandafter\Url@use
+  \expandafter\strip@prefix\meaning\@tempa\, \relax\m@th$\endgroup}
+\let\Url@use\@empty
+
+\def\set@mathcode#1{\count@`#1\advance\count@\@tempcnta\mathcode`#1\count@}
+\def\set@mathact#1#2{\mathcode`#132768 \lccode`\~`#1\lowercase{\def~{#2}}}
+\def\set@mathnolig#1{\ifnum\mathcode`#1<32768
+   \lccode`\~`#1\lowercase{\edef~{\mathchar\number\mathcode`#1_{\/}}}%
+   \mathcode`#132768 \fi}
+
+\def\urldef#1#2{\begingroup \setbox\z@\hbox\bgroup
+  \def\Url@z{\Url@def{#1}{#2}}#2}
+\expandafter\ifx\csname DeclareRobustCommand\endcsname\relax
+  \def\Url@def#1#2#3{\m@th$\endgroup\egroup\endgroup
+    \def#1{#2{#3}}}
+\else
+  \def\Url@def#1#2#3{\m@th$\endgroup\egroup\endgroup
+    \DeclareRobustCommand{#1}{#2{#3}}}
+\fi
+
+\def\urlstyle#1{\csname url@#1style\endcsname}
+
+% Sample (and default) configuration:
+%
+\newcommand\url{\begingroup \Url}
+%
+\newcommand\path{\begingroup \urlstyle{tt}\Url}
+%
+% too many styles define \email like \address, so I will not define it.
+% \newcommand\email{\begingroup \urlstyle{rm}\Url}
+
+% Process LaTeX \package options
+%
+\urlstyle{tt}
+\@ifundefined{ProvidesPackage}{}{
+  \ProvidesPackage{url}[1996/02/06 \space ver 1.1 \space 
+       Verb mode for urls, email addresses, and file names]
+  \DeclareOption{hyphens}{\def\do@url@hyp{\do\-}}% allow breaks after hyphens
+  \DeclareOption{obeyspaces}{\let\Url@use\relax}
+  \ProcessOptions
+\ifx\Url@use\relax \def\Url@use#1 #2{#1\ifx\relax#2\@empty\else
+  \penalty\relpenalty\ #2\expandafter\Url@use\fi}\fi
+}
+
+\endinput
+%
+% url.sty  ver 1.1    6-Feb-1996   Donald Arseneau   asnd@reg.triumf.ca
+%
+% This package defines "\url", a form of "\verb" that allows linebreaks,
+% and can often be used in the argument to another command.  It can be
+% configured to print in different formats, and is particularly useful for 
+% hypertext links, email addresses, directories/paths, etc.  The font may 
+% be selected using the "\urlstyle" command and pre-defined text can be 
+% stored with the "\urldef" command. New url-like commands can be defined, 
+% and a "\path" command is provided this way. 
+%
+% Usage:    Conditions:
+% \url{ }   If the argument contains any "%", "#", or "^^", or ends with 
+%           "\", it can't be used in the argument to another command.  
+%           The argument must not contain unbalanced braces.
+% \url|  |  ...where "|" is any character not used in the argument and not 
+%           "{".  The same restrictions as above except that the argument
+%           may contain unbalanced braces.
+% \xyz      for "\xyz" a defined-url;  this can be used anywhere, no matter
+%           what characters it contains.
+% 
+% The "\url" command is fragile, and its argument is likely to be very
+% fragile, but a defined-url is robust.
+%
+% Package Option:  obeyspaces
+% Ordinarily, all spaces are ignored in the url-text.  The "[obeyspaces]" 
+% option allows spaces, but may introduce spurious spaces when a url
+% containing "\" characters is given in the argument to another command.  
+% So if you need to obey spaces should say "\usepackage[obeyspaces]{url}",
+% and if you need both spaces and backslashes, use a `defined-url' for 
+% anything with "\".
+%
+% Package Option:  hyphens
+% Ordinarily, breaks are not allowed after "-" characters because this 
+% leads to confusion. (Is the "-" part of the address or just a hyphen?)  
+% The package option "[hyphens]" allows breaks after explicit hyphen 
+% characters.  The "\url" command will *never ever* hyphenate words.
+% 
+% Defining a defined-url:
+% Take for example the email address "myself%node@gateway.net" which could
+% not be given (using "\url" or "\verb") in a caption or parbox due to the
+% percent sign.  This address can be predefined with 
+%    \urldef{\myself}\url{myself%node@gateway.net}   or
+%    \urldef{\myself}\url|myself%node@gateway.net|
+% and then you may use "\myself" instead of "\url{myself%node@gateway.net}"
+% in an argument, and even in a moving argument like a caption because a
+% defined-url is robust.
+%
+% Style: 
+% You can switch the style of printing using "\urlstyle{tt}", where "tt"
+% can be any defined style.  The pre-defined styles are "tt", "rm", "sf", 
+% and "same" which all allow the same linebreaks but different fonts -- 
+% the first three select a specific font and the "same" style uses the
+% current text font.  You can define your own styles with different fonts 
+% and/or line-breaking by following the explanations below.  The "\url" 
+% command follows whatever the currently-set style dictates.
+%
+% Alternate commands:
+% It may be desireable to have different things treated differently, each
+% in a predefined style; e.g., if you want directory paths to always be 
+% in tt and email addresses to be rm, then you would define new url-like
+% commands as follows:
+%
+%    \newcommand\email{\begingroup \urlstyle{rm}\Url}
+%    \newcommand\directory{\begingroup \urlstyle{tt}\Url}
+%
+% You must follow this format closely, and NOTE that the final command is 
+% "\Url", not "\url".  In fact, the "\directory" example is exactly the 
+% "\path" definition which is pre-defined in the package.  If you look 
+% above, you will see that "\url" is defined with
+%    \newcommand\url{\begingroup \Url}
+% I.e., using whatever url-style has been selected.
+%
+% You can make a defined-url for these other styles, using the usual 
+% "\urldef" command as in this example:
+%
+%    \urldef{\myself}{\email}{myself%node.domain@gateway.net}
+%
+% which makes "\myself" act like "\email{myself%node.domain@gateway.net}",
+% if the "\email" command is defined as above.  The "\myself" command is
+% robust.
+%
+% Defining styles:
+% Before describing how to customize the printing style, it is best to 
+% mention something about the unusual implementation of "\url".  Although
+% the material is textual in nature, and the font specification required
+% is a text-font command, the text is actually typeset in *math* mode.
+% This allows the context-sensitive linebreaking, but also accounts for
+% the default behavior of ignoring spaces.  Now on to defining styles.
+%
+% To change the font or the list of characters that allow linebreaks, you
+% could redefine the commands "\UrlFont", "\UrlBreaks", "\UrlSpecials" etc.
+% directly in the document, but it is better to define a new `url-style' 
+% (following the example of "\url@ttstyle" and "\url@rmstyle") which defines 
+% all of "\UrlBigbreaks", "\UrlNoBreaks", "\UrlBreaks", "\UrlSpecials", and 
+% "\UrlFont".
+%
+% Changing font:
+% The "\UrlFont" command selects the font.  The definition of "\UrlFont"
+% done by the pre-defined styles varies to cope with a variety of LaTeX
+% font selection schemes, but it could be as simple as "\def\UrlFont{\tt}".
+% In addition to setting "\UrlFont", some characters will probably need 
+% to be defined in the "\UrlSpecials" list because most fonts don't have 
+% all the standard input characters.  See the definition of "\url@rmstyle", 
+% which implements "\urlstyle{rm}".  Or even better, follow the definition
+% of "\url@sfstyle", which executes "\url@rmstyle" and then redefines
+% just "\UrlFont".  The nominal format for each special character "c" 
+% in the "\UrlSpecials" list is: "\do\c{<definition>}", but you can 
+% include other definitions too.
+%
+% Changing linebreaks:
+% The list of characters that allow line-breaks is given by "\UrlBreaks" 
+% and "\UrlBigBreaks", which have the format "\do\c" for character "c". 
+% The differences are that `BigBreaks' have a lower penalty and have 
+% different breakpoints when in sequence (as in "http://"): `BigBreaks' 
+% are treated as mathrels while `Breaks' are mathbins (see The TeXbook, 
+% p.170). In particular, a series of `BigBreak' characters will break at 
+% the end and only at the end; a series of `Break' characters will break 
+% after the first and after every following *pair*; there will be no 
+% break after a `Break' character if a `BigBreak' follows.  In the case 
+% of "http://" it doesn't matter whether ":" is a `Break' or `BigBreak' --
+% the breaks are the same in either case; but for DECnet nodes with "::"
+% it is important to prevent breaks *between* the colons, and that is why 
+% colons are `BigBreaks'.
+%
+% It is possible for characters to prevent breaks after the next following 
+% character (I use this for parentheses).  Specify these in "\UrlNoBreaks". 
+%
+% You can do arbitrarily complex things with characters by making them 
+% active in math mode (mathcode hex-8000) and specifying the definition(s)
+% in "\UrlSpecials".  This is used in the rm and sf styles to handle 
+% several characters that are not present in fonts.
+%
+% If all this sounds confusing ... well, it is!  But I hope you won't need 
+% to redefine breakpoints -- the default assignments seem to work well for 
+% a wide variety of applications.  If you do need to make changes, you can 
+% test for breakpoints using regular math mode and the characters "+=(a".
+%
+% Yet more flexibility:
+% You can also set up url.sty to do multiple things with the verbatim text
+% by defining "\Url@use", but the format of the definition is special:
+%
+%    \def\Url@use#1\,{ ... do things with #1 ... }
+%
+% Yes, that is "#1" followed by "\," then the definition.  For example, 
+% to put a hypertext link in the DVI file:
+%
+%    \def\Url@use#1\,{\special{html:<a href="#1">}#1\special{html:</a>}}
+%
+% The End
+% ver 1.1 6-Feb-1996:  
+% Fix hyphens that wouldn't break and ligatures that weren't suppressed.
+
+Test file integrity:  ASCII 32-57, 58-126:  !"#$%&'()*+,-./0123456789
+:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~




