% url.sty  ver 3.4    16-Sep-2013   Donald Arseneau   asnd@triumf.ca
% Copyright 1996-2013 Donald Arseneau,  Vancouver, Canada.
% This program can be used, distributed, and modified under the terms
% of the LaTeX Project Public License, version 2 or later.
%
% 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
%           "{" or a space.  The same restrictions as above except that the
%           argument may contain unbalanced braces.
% \urldef\xyz\url{ }
% \xyz      a defined-url: "\xyz" can be used anywhere, no matter what
%           characters it contains.
% \DeclareUrlCommand\abc{settings}: makes \abc{ } like \url{ } with settings
%
% See url.tex/url.pdf for documentation.  Some info after \endinput
%
% Required catcodes during loading:  letters @ = letter, 
%        ` = > < . [ ] + - digits = other,  
%        { } \ ~ # % $ _ ^ = their normal

% default style assignments
\def\UrlBreaks{\do\.\do\@\do\\\do\/\do\!\do\_\do\|\do\;\do\>\do\]%
 \do\)\do\,\do\?\do\&\do\'\do+\do\=\do\#}%
\def\UrlBigBreaks{\do\:\do@url@hyp}%
\def\UrlNoBreaks{\do\(\do\[\do\{\do\<}%
% any ordinary characters that aren't usually:
\def\UrlOrds{\do\*\do\-\do\~\do\'\do\"\do\-}%
\def\UrlSpecials{\do\ {\Url@space}\do\%{\Url@percent}\do\^^M{\Url@space}%
   \Url@force@Tilde}% package option may force faked text-ascii-tilde

\@namedef{Url@OT1encSpecials}{%
  %  *Some* latin-1 or windows characters that ot1 has elsewhere:  OE  oe  ss
  \do\^^8c{\mathchar30 }\do\^^9c{\mathchar27 }\do\^^df{\mathchar25 }%
  \do\~{\lower.45ex\hbox{\m@th$\mathchar126$}}% For tt style
  % lots more to add, but I should later link into inputenc
  \do\^^b5{\mu}%
  \Url@OTnonTT % more for any but typewriter
  }

\def\Url@OTnonTT{\do\<{\langle}\do\>{\mathbin{\rangle}}\do
  \_{\_\penalty\@m}\do\|{\mid}\do\{{\lbrace}\do\}{\mathbin{\rbrace}}\do
  \\{\mathbin{\backslash}}\UrlTildeSpecial}

% *Some* latin-1 or windows characters. Most will pass through safely to T1 enc
% mu  inverted-?  OE  oe
% lots more to add, but I should later link into inputenc
\@namedef{Url@T1encSpecials}{\do\^^b5{\mu}\do\^^bf{\mathchar190 }%
  \do\^^8c{\mathchar215 }\do\^^9c{\mathchar247 }\do\^^df{\mathchar255 }%
  \do\^^ff{\mathchar184 }}

\@namedef{Url@LY1encSpecials}{\do\~{\mathchar158 }}

\def\UrlTildeSpecial{\do\~{\raise.45ex\hbox{\m@th$\scriptstyle\sim$}}}
\let\Url@force@Tilde\relax

\def\url@ttstyle{%
 \@ifundefined{selectfont}{\def\UrlFont{\tt}}{\def\UrlFont{\ttfamily}}}

\def\url@rmstyle{%
 \@ifundefined{selectfont}{\def\UrlFont{\rm}}{\def\UrlFont{\rmfamily}}}

\def\url@sfstyle{%
 \@ifundefined{selectfont}{\def\UrlFont{\sf}}{\def\UrlFont{\sffamily}}}

\def\url@samestyle{\def\UrlFont{}}

\@ifundefined{strip@prefix}{\def\strip@prefix#1>{}}{}
\@ifundefined{verbatim@nolig@list}{\def\verbatim@nolig@list{\do\`}}{}

% \Url sets up the reading the argument verbatim if possible
\def\Url{%
 \Url@movingtest
 \ifmmode\@inmatherr$\fi %$
 \let\do\@makeother \dospecials % verbatim catcodes
 \catcode`{\@ne \catcode`}\tw@ % with exceptions
 \catcode`\ =10 % allow "\url {x}"
 \catcode`\#=6  % always # -> ##, so I can later convert ## -> #
 \@ifnextchar\bgroup{\obeyspaces\obeylines\Url@z}\Url@y}

% \Url@y read arguments delimited like |...|, passing to \Url@z
\def\Url@y#1{\catcode`{11 \catcode`}11\obeyspaces\obeylines
  \def\@tempa##1#1{\Url@z{##1}}\@tempa}

% \Url@z read arguments delimited like {...}, verbatimizes with \meaning,
% performs character translations, then invokes the formatter.
\def\Url@z#1{\toks@{#1}\edef\Url@String{\the\toks@}%
  \edef\Url@String{\expandafter\strip@prefix\meaning\Url@String}%
%\if\urldebug \message{------------------------------------------------------}%
%\message{ \Url@String}\fi
% \meaning introduces spurious spaces in the text, so it would be nice
% to preserve the real spaces before \meaning, but that doesn't work --
% we can only do replacement on streams of non-syntactic characters.
  \Url@ObeySp % may be no-op; otherwise put ordinary (12) space characters
%\if\urldebug \message{ \Url@String}\fi
% we left the catcode of # with its normal value (6) so \meaning
% doubles it to ##.  Now we convert back to single #.  This allows
% \url{#} to appear in the arguments of other commands, where we can't
% make # be an ordinary character.  We make the single # active rather
% than `other' to support hyperref.sty.
  \Url@acthash
%\if\urldebug \message{ \Url@String}\fi
% Also make % active to support hyperref.
  \Url@actpercent
% now do any hyper referencing due to hyperref (or perform a url-def)
  \Url@HyperHook
% Now do the formatting in a group (can also have \Url@HyperHook take
% this as an argument.
  {\Url@FormatString}%
  \endgroup}

\let\Url@ObeySp\@empty
\let\UrlRight\@empty
\let\UrlLeft\@empty
\let\Url@HyperHook\@empty

% This is the normal way to format the strings, using math mode.
\def\Url@FormatString{%
 \UrlFont \Url@MathSetup 
 $\fam\z@ \textfont\z@\font
 \expandafter\UrlLeft\Url@String\UrlRight
 \m@th$%
% \if\urldebug \showlists \fi 
}%

\def\Url@MathSetup{%
 \medmuskip\Urlmuskip \thickmuskip\medmuskip \thinmuskip0mu%
 \relpenalty\UrlBigBreakPenalty \binoppenalty\UrlBreakPenalty
 \expandafter\let\expandafter\UrlEncSpecials\csname Url@\f@encoding encSpecials\endcsname
 % Insert test for unknown encodings here \ifx\UrlEncSpecials\relax
 \ifdim\fontdimen\thr@@\font=\z@ \let\Url@OTnonTT\relax \fi
 \@tempcnta\z@ %  \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 \UrlEncSpecials % active
 \let\do\set@mathnolig \verbatim@nolig@list % prevent ligatures
}

\def\set@mathcode#1{\count@`#1\advance\count@\@tempcnta
%\message{Set mathcode of \string #1 (\number`#1) = \number`#1 + \number\@tempcnta. }%
\mathcode`#1\count@}
\def\set@mathact#1#2{\mathcode`#1=32768 \begingroup 
    \lccode`\~`#1\lowercase{\endgroup\def~}{#2}}
\def\set@mathnolig#1{\ifnum\mathcode`#1<32768
   \begingroup\lccode`\~`#1\lowercase{\endgroup
     \edef~}{\mathchar\number\mathcode`#1\sb{\/}}%
   \mathcode`#1=32768 \fi}

\def\Url@movingtest{\begingroup
 \ifx\let\HyPsd@LetCommand % we are already in a pdf string!
  \expandafter\Url@unmove \fi % give the argument and hope for the best
 \let\Url@moving\relax\relax\relax
 \ifx\Url@moving\relax\else \expandafter\Url@unmove \fi
 \endgroup}
\long\def\Url@unmove#1\Url@y{\endgroup \ifx\protect\relax\else\protect\Url\fi}
\edef\Url@moving{\csname Url Error\endcsname}
\expandafter\edef\Url@moving
 {\csname url used in a moving argument.\endcsname}
\expandafter\expandafter\expandafter \let \Url@moving\@undefined

\def\urldef#1#2{\begingroup \setbox\z@\hbox\bgroup
  \def\Url@HyperHook##1\endgroup{\Url@def{#1}{#2}}%
  % Because hyperref breaks \urldef and does not define its own (Grrrr!)...
  \def\url@##1{\egroup\endgroup\DeclareRobustCommand#1{#2{##1}}}%
 #2}
\def\Url@def#1#2{%
   \toks0\expandafter{\Url@String}%
   \protected@edef\Url@String{\Url@String}%
   \toks1\expandafter{\Url@String}%
   \edef\Url@String{\endgroup\egroup\endgroup\def
     \expandafter\noexpand\csname\expandafter\@gobble\string#1 \endcsname
     {\noexpand\Url@eitherdef{\the\toks1}{\noexpand#2{\the\toks0}}}}%
   \Url@String
   \edef#1{\noexpand\protect
      \expandafter\noexpand\csname\expandafter\@gobble\string#1 \endcsname}%
  }
\def\Url@eitherdef{\ifx\let\HyPsd@LetCommand % we are already in a pdf string!
  \expandafter\@firstoftwo \else \expandafter\@secondoftwo \fi}

\def\urlstyle#1{\expandafter\protect\csname url@#1style\endcsname}

\def\DeclareUrlCommand#1#2{\def#1{\leavevmode\begingroup #2\Url}}

% Sample (and default) configuration:
%
\DeclareUrlCommand\url{}
\urlstyle{tt}
%
\newmuskip\Urlmuskip \Urlmuskip=0mu
\mathchardef\UrlBreakPenalty=\binoppenalty
\mathchardef\UrlBigBreakPenalty=\relpenalty
%
% picTeX defines \path, so declare it optionally:
\@ifundefined{path}{\DeclareUrlCommand\path{\urlstyle{tt}}}{}
%
% too many styles define \email like \address, so I will not define it.
% \DeclareUrlCommand\email{\urlstyle{rm}}

% Process LaTeX \package options
%
\let\Url@sppen\@M
\def\Url@space{\penalty\Url@sppen}
\def\do@url@hyp{}% by default, no breaks after hyphens

\@ifundefined{ProvidesPackage}{
}{\ProvidesPackage
 {url}[2013/09/16 \space ver 3.4 \space Verb mode for urls, etc.]
\DeclareOption{hyphens}{\def\do@url@hyp{\do\-}}% allow breaks after hyphens
\DeclareOption{obeyspaces}{\let\Url@ObeySp\relax}% a flag for later
\DeclareOption{spaces}{\def\Url@sppen{\UrlBreakPenalty}}
\DeclareOption{LY1}{}
\DeclareOption{T1}{}
\DeclareOption{allowmove}{\let\Url@moving\@empty}
\DeclareOption{lowtilde}{%
  \def\UrlTildeSpecial{\do\~{\raise.2ex\hbox{\m@th$\scriptstyle\sim$}}}
  \let\Url@force@Tilde\UrlTildeSpecial
}
\ProcessOptions\relax
\ifx\Url@ObeySp\relax % [obeyspaces] was declared
  \begingroup \lccode`+=32 \lowercase
   {\endgroup \def\Url@ObeySp{\Url@Edit\Url@String{ }{+}}}
   \def\Url@space{\penalty\Url@sppen\ }
\fi
}
\ifx\f@encoding\undefined \def\f@encoding{OT1}\fi

\begingroup
% \Url@acthash:    convert `other' (doubled) ## to active #
% \Url@actpercent: convert `other' % to active %
 \lccode`+=`\# \lccode`\~=`\#
  \lowercase {\long\gdef\Url@acthash{\Url@Edit\Url@String{++}{~}%
     \ifnum\mathcode`\#<32768 \def~{\#}\fi}}%
 \lccode`+=`\% \lccode`\~=`\%
  \lowercase {\long\gdef\Url@actpercent{\Url@Edit\Url@String{+}{~}%
    \ifnum\mathcode`\%<32768 \def~{\%}\fi}}%
 \catcode13=12 %
 \gdef\Url@percent{\@ifnextchar^^M{\@gobble}{\mathbin{\mathchar`\%}}}%
\endgroup%

%   Edit macro #1 changing all appearances of pattern #2 to replacement #3.
%   The replacement is recursive, so don't put the search pattern into the
%   replacement text!

{ \catcode`Q=3

\gdef\Url@Edit#1#2#3{%
 \begingroup % \tracingall
 \def\DOE@a{\endgroup\def#1}% Just so I can \expandafter it safely.
 \def\DOE@b##1#2##2Q##3{\@ifblank{##2}% if finished,
   {\DOE@c ##1Q}% then remove \@empty's and redefine macro
   {\DOE@b##1##3##2Q{##3}}% else, re-iterate
 }%  the leading \@empty preserves braces, as does the trailing pattern:
 \expandafter\DOE@b\expandafter\@empty #1\@empty#2Q{#3}}
\gdef\DOE@c#1\@empty Q{\expandafter\DOE@a\expandafter{#1}}
%
%  \@ifblank (LaTeX syntax) --- checks if parameter is blank (Spaces
%     count as blank) use \@ifblank{#1}{true case}{false case} etc
\long\gdef\@ifblank#1{\@Ifbl@nk#1QQ\@secondoftwo\@firstoftwo!}%
\long\gdef\@Ifbl@nk#1#2Q#3#4#5!{#4}

} % restore Q catcode


%\ifx\urldebug\@undefined \def\urldebug{01}\fi

\endinput
% For documentation, please see accompanying url.tex (url.pdf)
% Package Options:  obeyspaces, hyphens, spaces, lowtilde
%
% Revision History:
% ver 1.1 6-Feb-1996:
% Fix hyphens that wouldn't break and ligatures that weren't suppressed.
% ver 1.2 19-Oct-1996:
% Package option for T1 encoding; Hooks: "\UrlLeft" and "\UrlRight".
% ver 1.3 21-Jul-1997:
% Prohibit spaces as delimiter characters; change ascii tilde in OT1.
% ver 1.4 02-Mar-1999:
% LaTeX license; moving-argument-error
% ver 1.5 28-Mar-1999:
% possibility of spacing around break characters; re-settable penalties
% ver 1.6 20-Jun-2002:
% un-double #, fix obeyed-spaces, ignore trailing %, hook for hyperref
% (\Url@HyperHook), no macros in pre-processed url string (in \Url@String),
% limit catcode change of ~.
% ver 3.0 June 2003/Nov 2003:
% \DeclareUrlCommand; make font encoding automatic (only a few inputenc characters
% are supported yet - needs refactoring); reverse penalties. 
% ver 3.1 Mar 2004:
% Remove spurious spaces in \url@XXstyle commands.
% ver 3.2 June 2005:
% Fix cmsy-symbols in tt bug (from 3.0); LY1 encoding bug; Enable plain
% with miniltx (again); Define the \urldef for hyperref; Lower "sim" tilde
% a little; fix \lowercase error in \UrlSpecials handling.
% ver 3.3 April 2006:
% Fix some encoding bugs and remove 8-bit characters.  lowtilde option
% ver 3.4 Sept 2013:
% \@nomatherr->\@inmatherr. & is now another \UrlBreak character.
% The End

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