Annotation of embedaddon/bird2/doc/tex/url.sty, revision 1.1
1.1 ! misho 1: % url.sty ver 1.2 19-Oct-1996 Donald Arseneau asnd@triumf.ca
! 2: %
! 3: % A form of \verb that allows linebreaks at certain characters or
! 4: % combinations of characters, accepts reconfiguration, and can usually
! 5: % be used in the argument to another command. It is intended for email
! 6: % addresses, hypertext links, directories/paths, etc., which normally
! 7: % have no spaces. The font may be selected using the \urlstyle command,
! 8: % and new url-like commands can be defined using \urldef.
! 9: %
! 10: % Usage: Conditions:
! 11: % \url{ } If the argument contains any "%", "#", or "^^", or ends with
! 12: % "\", it can't be used in the argument to another command.
! 13: % The argument must not contain unbalanced braces.
! 14: % \url| | ...where "|" is any character not used in the argument and not
! 15: % "{". The same restrictions as above except that the argument
! 16: % may contain unbalanced braces.
! 17: % \xyz for "\xyz" a defined-url; this can be used anywhere, no matter
! 18: % what characters it contains.
! 19: %
! 20: % See further instructions after "\endinput"
! 21: %
! 22: \def\Url@ttdo{% style assignments for tt fonts or T1 encoding
! 23: \def\UrlBreaks{\do\.\do\@\do\\\do\/\do\!\do\_\do\|\do\%\do\;\do\>\do\]%
! 24: \do\)\do\,\do\?\do\'\do\+\do\=}%
! 25: \def\UrlBigBreaks{\do\:\do@url@hyp}%
! 26: \def\UrlNoBreaks{\do\(\do\[\do\{\do\<}% (unnecessary)
! 27: \def\UrlSpecials{\do\ {\ }}%
! 28: \def\UrlOrds{\do\*\do\-\do\~}% any ordinary characters that aren't usually
! 29: }
! 30: \def\Url@do{% style assignments for OT1 fonts except tt
! 31: \def\UrlBreaks{\do\.\do\@\do\/\do\!\do\%\do\;\do\]\do\)\do\,\do\?\do\+\do\=}%
! 32: \def\UrlBigBreaks{\do\:\do@url@hyp}%
! 33: \def\UrlNoBreaks{\do\(\do\[\do\{}% prevents breaks after *next* character
! 34: \def\UrlSpecials{\do\<{\langle}\do\>{\mathbin{\rangle}}\do\_{\_%
! 35: \penalty\@m}\do\|{\mid}\do\{{\lbrace}\do\}{\mathbin{\rbrace}}\do
! 36: \\{\mathbin{\backslash}}\do\~{\mathord{{}^{\textstyle\sim}}}\do\ {\ }}%
! 37: \def\UrlOrds{\do\'\do\"\do\-}%
! 38: }
! 39: \def\url@ttstyle{%
! 40: \@ifundefined{selectfont}{\def\UrlFont{\tt}}{\def\UrlFont{\ttfamily}}\Url@ttdo
! 41: }
! 42: \def\url@rmstyle{%
! 43: \@ifundefined{selectfont}{\def\UrlFont{\rm}}{\def\UrlFont{\rmfamily}}\Url@do
! 44: }
! 45: \def\url@sfstyle{%
! 46: \@ifundefined{selectfont}{\def\UrlFont{\sf}}{\def\UrlFont{\sffamily}}\Url@do
! 47: }
! 48: \def\url@samestyle{\ifdim\fontdimen\thr@@\font=\z@ \url@ttstyle \else
! 49: \url@rmstyle \fi \def\UrlFont{}}
! 50:
! 51: \@ifundefined{strip@prefix}{\def\strip@prefix#1>{}}{}
! 52: \@ifundefined{verbatim@nolig@list}{\def\verbatim@nolig@list{\do\`}}{}
! 53:
! 54: \def\Url{\relax\ifmmode\@nomatherr$\fi
! 55: \UrlFont $\fam\z@ \textfont\z@\font
! 56: \let\do\@makeother \dospecials % verbatim catcodes
! 57: \catcode`{\@ne \catcode`}\tw@ % except braces
! 58: \medmuskip0mu \thickmuskip\medmuskip \thinmuskip\medmuskip
! 59: \@tempcnta\fam\multiply\@tempcnta\@cclvi
! 60: \let\do\set@mathcode \UrlOrds % ordinary characters that were special
! 61: \advance\@tempcnta 8192 \UrlBreaks % bin
! 62: \advance\@tempcnta 4096 \UrlBigBreaks % rel
! 63: \advance\@tempcnta 4096 \UrlNoBreaks % open
! 64: \let\do\set@mathact \UrlSpecials % active
! 65: \let\do\set@mathnolig \verbatim@nolig@list % prevent ligatures
! 66: \@ifnextchar\bgroup\Url@z\Url@y}
! 67:
! 68: \def\Url@y#1{\catcode`{11 \catcode`}11
! 69: \def\@tempa##1#1{\Url@z{##1}}\@tempa}
! 70: \def\Url@z#1{\def\@tempa{#1}\expandafter\expandafter\expandafter\Url@Hook
! 71: \expandafter\strip@prefix\meaning\@tempa\UrlRight\m@th$\endgroup}
! 72: \def\Url@Hook{\UrlLeft}
! 73: \let\UrlRight\@empty
! 74: \let\UrlLeft\@empty
! 75:
! 76: \def\set@mathcode#1{\count@`#1\advance\count@\@tempcnta\mathcode`#1\count@}
! 77: \def\set@mathact#1#2{\mathcode`#132768 \lccode`\~`#1\lowercase{\def~{#2}}}
! 78: \def\set@mathnolig#1{\ifnum\mathcode`#1<32768
! 79: \lccode`\~`#1\lowercase{\edef~{\mathchar\number\mathcode`#1_{\/}}}%
! 80: \mathcode`#132768 \fi}
! 81:
! 82: \def\urldef#1#2{\begingroup \setbox\z@\hbox\bgroup
! 83: \def\Url@z{\Url@def{#1}{#2}}#2}
! 84: \expandafter\ifx\csname DeclareRobustCommand\endcsname\relax
! 85: \def\Url@def#1#2#3{\m@th$\endgroup\egroup\endgroup
! 86: \def#1{#2{#3}}}
! 87: \else
! 88: \def\Url@def#1#2#3{\m@th$\endgroup\egroup\endgroup
! 89: \DeclareRobustCommand{#1}{#2{#3}}}
! 90: \fi
! 91:
! 92: \def\urlstyle#1{\csname url@#1style\endcsname}
! 93:
! 94: % Sample (and default) configuration:
! 95: %
! 96: \newcommand\url{\begingroup \Url}
! 97: %
! 98: \newcommand\path{\begingroup \urlstyle{tt}\Url}
! 99: %
! 100: % too many styles define \email like \address, so I will not define it.
! 101: % \newcommand\email{\begingroup \urlstyle{rm}\Url}
! 102:
! 103: % Process LaTeX \package options
! 104: %
! 105: \urlstyle{tt}
! 106: \let\Url@sppen\@M
! 107: \def\do@url@hyp{}% by default, no breaks after hyphens
! 108:
! 109: \@ifundefined{ProvidesPackage}{}{
! 110: \ProvidesPackage{url}[1996/10/19 \space ver 1.2 \space
! 111: Verb mode for urls, email addresses, and file names]
! 112: \DeclareOption{hyphens}{\def\do@url@hyp{\do\-}}% allow breaks after hyphens
! 113: \DeclareOption{obeyspaces}{\let\Url@Hook\relax}% a flag for later
! 114: \DeclareOption{spaces}{\let\Url@sppen\relpenalty}
! 115: \DeclareOption{T1}{\let\Url@do\Url@ttdo}
! 116: \ProcessOptions
! 117: \ifx\Url@Hook\relax % [obeyspaces] was declared
! 118: \def\Url@Hook#1\UrlRight\m@th{\edef\@tempa{\noexpand\UrlLeft
! 119: \Url@retain#1\Url@nosp\, }\@tempa\UrlRight\m@th}
! 120: \def\Url@retain#1 {#1\penalty\Url@sppen\ \Url@retain}
! 121: \def\Url@nosp\,#1\Url@retain{}
! 122: \fi
! 123: }
! 124:
! 125: \endinput
! 126: %
! 127: % url.sty ver 1.2 19-Oct-1996 Donald Arseneau asnd@reg.triumf.ca
! 128: %
! 129: % This package defines "\url", a form of "\verb" that allows linebreaks,
! 130: % and can often be used in the argument to another command. It can be
! 131: % configured to print in different formats, and is particularly useful for
! 132: % hypertext links, email addresses, directories/paths, etc. The font may
! 133: % be selected using the "\urlstyle" command and pre-defined text can be
! 134: % stored with the "\urldef" command. New url-like commands can be defined,
! 135: % and a "\path" command is provided this way.
! 136: %
! 137: % Usage: Conditions:
! 138: % \url{ } If the argument contains any "%", "#", or "^^", or ends with
! 139: % "\", it can't be used in the argument to another command.
! 140: % The argument must not contain unbalanced braces.
! 141: % \url| | ...where "|" is any character not used in the argument and not
! 142: % "{". The same restrictions as above except that the argument
! 143: % may contain unbalanced braces.
! 144: % \xyz for "\xyz" a defined-url; this can be used anywhere, no matter
! 145: % what characters it contains.
! 146: %
! 147: % The "\url" command is fragile, and its argument is likely to be very
! 148: % fragile, but a defined-url is robust.
! 149: %
! 150: % Package Option: obeyspaces
! 151: % Ordinarily, all spaces are ignored in the url-text. The "[obeyspaces]"
! 152: % option allows spaces, but may introduce spurious spaces when a url
! 153: % containing "\" characters is given in the argument to another command.
! 154: % So if you need to obey spaces you can say "\usepackage[obeyspaces]{url}",
! 155: % and if you need both spaces and backslashes, use a `defined-url' for
! 156: % anything with "\".
! 157: %
! 158: % Package Option: hyphens
! 159: % Ordinarily, breaks are not allowed after "-" characters because this
! 160: % leads to confusion. (Is the "-" part of the address or just a hyphen?)
! 161: % The package option "[hyphens]" allows breaks after explicit hyphen
! 162: % characters. The "\url" command will *never ever* hyphenate words.
! 163: %
! 164: % Package Option: spaces
! 165: % Likewise, breaks are not usually allowed after spaces under the
! 166: % "[obeyspaces]" option, but giving the options "[obeyspaces,spaces]"
! 167: % will allow breaks at those spaces.
! 168: %
! 169: % Package Option: T1
! 170: % This signifies that you will be using T1-encoded fonts which contain
! 171: % some characters missing from most older (OT1) encoded TeX fonts. This
! 172: % changes the default definition for "\urlstyle{rm}".
! 173: %
! 174: % Defining a defined-url:
! 175: % Take for example the email address "myself%node@gateway.net" which could
! 176: % not be given (using "\url" or "\verb") in a caption or parbox due to the
! 177: % percent sign. This address can be predefined with
! 178: % \urldef{\myself}\url{myself%node@gateway.net} or
! 179: % \urldef{\myself}\url|myself%node@gateway.net|
! 180: % and then you may use "\myself" instead of "\url{myself%node@gateway.net}"
! 181: % in an argument, and even in a moving argument like a caption because a
! 182: % defined-url is robust.
! 183: %
! 184: % Style:
! 185: % You can switch the style of printing using "\urlstyle{tt}", where "tt"
! 186: % can be any defined style. The pre-defined styles are "tt", "rm", "sf",
! 187: % and "same" which all allow the same linebreaks but different fonts --
! 188: % the first three select a specific font and the "same" style uses the
! 189: % current text font. You can define your own styles with different fonts
! 190: % and/or line-breaking by following the explanations below. The "\url"
! 191: % command follows whatever the currently-set style dictates.
! 192: %
! 193: % Alternate commands:
! 194: % It may be desireable to have different things treated differently, each
! 195: % in a predefined style; e.g., if you want directory paths to always be
! 196: % in tt and email addresses to be rm, then you would define new url-like
! 197: % commands as follows:
! 198: %
! 199: % \newcommand\email{\begingroup \urlstyle{rm}\Url}
! 200: % \newcommand\directory{\begingroup \urlstyle{tt}\Url}
! 201: %
! 202: % You must follow this format closely, and NOTE that the final command is
! 203: % "\Url", not "\url". In fact, the "\directory" example is exactly the
! 204: % "\path" definition which is pre-defined in the package. If you look
! 205: % above, you will see that "\url" is defined with
! 206: % \newcommand\url{\begingroup \Url}
! 207: % I.e., using whatever url-style has been selected.
! 208: %
! 209: % You can make a defined-url for these other styles, using the usual
! 210: % "\urldef" command as in this example:
! 211: %
! 212: % \urldef{\myself}{\email}{myself%node.domain@gateway.net}
! 213: %
! 214: % which makes "\myself" act like "\email{myself%node.domain@gateway.net}",
! 215: % if the "\email" command is defined as above. The "\myself" command
! 216: % would then be robust.
! 217: %
! 218: % Defining styles:
! 219: % Before describing how to customize the printing style, it is best to
! 220: % mention something about the unusual implementation of "\url". Although
! 221: % the material is textual in nature, and the font specification required
! 222: % is a text-font command, the text is actually typeset in *math* mode.
! 223: % This allows the context-sensitive linebreaking, but also accounts for
! 224: % the default behavior of ignoring spaces. Now on to defining styles.
! 225: %
! 226: % To change the font or the list of characters that allow linebreaks, you
! 227: % could redefine the commands "\UrlFont", "\UrlBreaks", "\UrlSpecials" etc.
! 228: % directly in the document, but it is better to define a new `url-style'
! 229: % (following the example of "\url@ttstyle" and "\url@rmstyle") which defines
! 230: % all of "\UrlBigbreaks", "\UrlNoBreaks", "\UrlBreaks", "\UrlSpecials", and
! 231: % "\UrlFont".
! 232: %
! 233: % Changing font:
! 234: % The "\UrlFont" command selects the font. The definition of "\UrlFont"
! 235: % done by the pre-defined styles varies to cope with a variety of LaTeX
! 236: % font selection schemes, but it could be as simple as "\def\UrlFont{\tt}".
! 237: % Depending on the font selected, some characters may need to be defined
! 238: % in the "\UrlSpecials" list because many fonts don't contain all the
! 239: % standard input characters.
! 240: %
! 241: % Changing linebreaks:
! 242: % The list of characters that allow line-breaks is given by "\UrlBreaks"
! 243: % and "\UrlBigBreaks", which have the format "\do\c" for character "c".
! 244: % The differences are that `BigBreaks' have a lower penalty and have
! 245: % different breakpoints when in sequence (as in "http://"): `BigBreaks'
! 246: % are treated as mathrels while `Breaks' are mathbins (see The TeXbook,
! 247: % p.170). In particular, a series of `BigBreak' characters will break at
! 248: % the end and only at the end; a series of `Break' characters will break
! 249: % after the first and after every following *pair*; there will be no
! 250: % break after a `Break' character if a `BigBreak' follows. In the case
! 251: % of "http://" it doesn't matter whether ":" is a `Break' or `BigBreak' --
! 252: % the breaks are the same in either case; but for DECnet nodes with "::"
! 253: % it is important to prevent breaks *between* the colons, and that is why
! 254: % colons are `BigBreaks'.
! 255: %
! 256: % It is possible for characters to prevent breaks after the next following
! 257: % character (I use this for parentheses). Specify these in "\UrlNoBreaks".
! 258: %
! 259: % You can do arbitrarily complex things with characters by making them
! 260: % active in math mode (mathcode hex-8000) and specifying the definition(s)
! 261: % in "\UrlSpecials". This is used in the rm and sf styles for OT1 font
! 262: % encoding to handle several characters that are not present in those
! 263: % computer-modern style fonts. See the definition of "\Url@do", which
! 264: % is used by both "\url@rmstyle" and "\url@sfstyle"; it handles missing
! 265: % characters via "\UrlSpecials". The nominal format for setting each
! 266: % special character "c" is: "\do\c{<definition>}", but you can include
! 267: % other definitions too.
! 268: %
! 269: %
! 270: % If all this sounds confusing ... well, it is! But I hope you won't need
! 271: % to redefine breakpoints -- the default assignments seem to work well for
! 272: % a wide variety of applications. If you do need to make changes, you can
! 273: % test for breakpoints using regular math mode and the characters "+=(a".
! 274: %
! 275: % Yet more flexibility:
! 276: % You can also customize the verbatim text by defining "\UrlRight" and/or
! 277: % "\UrlLeft", e.g., for ISO formatting of urls surrounded by "< >", define
! 278: %
! 279: % \renewcommand\url{\begingroup \def\UrlLeft{<url: }\def\UrlRight{>}%
! 280: % \urlstyle{tt}\Url}
! 281: %
! 282: % The meanings of "\UrlLeft" and "\UrlRight" are *not* reproduced verbatim.
! 283: % This lets you use formatting commands there, but you must be careful not
! 284: % to use TeX's special characters ("\^_%~#$&{}" etc.) improperly.
! 285: % You can also define "\UrlLeft" to reprocess the verbatim text, but the
! 286: % format of the definition is special:
! 287: %
! 288: % \def\UrlLeft#1\UrlRight{ ... do things with #1 ... }
! 289: %
! 290: % Yes, that is "#1" followed by "\UrlRight" then the definition. For
! 291: % example, to put a hyperTeX hypertext link in the DVI file:
! 292: %
! 293: % \def\UrlLeft#1\UrlRight{\special{html:<a href="#1">}#1\special{html:</a>}}
! 294: %
! 295: % Revision History:
! 296: % ver 1.1 6-Feb-1996:
! 297: % Fix hyphens that wouldn't break and ligatures that weren't suppressed.
! 298: % ver 1.2 19-Oct-1996:
! 299: % Package option for T1 encoding; Hooks: "\UrlLeft" and "\UrlRight".
! 300: %
! 301: % The End
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