summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/source/latex/tools/xr.dtx
blob: afa4c15acb0493bb42f0293a83fa7fbc059dae7e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
% \iffalse meta-comment
%
% Copyright 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
% 2006 2008 2009
% The LaTeX3 Project and any individual authors listed elsewhere
% in this file. 
% 
% This file is part of the Standard LaTeX `Tools Bundle'.
% -------------------------------------------------------
% 
% It may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.3c
% of this license or (at your option) any later version.
% The latest version of this license is in
%    http://www.latex-project.org/lppl.txt
% and version 1.3c or later is part of all distributions of LaTeX 
% version 2005/12/01 or later.
% 
% The list of all files belonging to the LaTeX `Tools Bundle' is
% given in the file `manifest.txt'.
% 
% \fi
% \iffalse
%% File: xr.dtx Copyright (C) 1994-1994 David Carlisle
%
%<package>\NeedsTeXFormat{LaTeX2e}
%<package>\ProvidesPackage{xr}
%<package>         [1994/05/28 v5.02 eXternal References (DPC)]
%
%<*driver>
\documentclass{ltxdoc}
\usepackage{xr}
\GetFileInfo{xr.sty}
\begin{document}
\title{The \textsf{xr} package\thanks{This file
        has version number \fileversion, last
        revised \filedate.}}
\author{David Carlisle\thanks{%
  The Author of Versions 1--4 was Jean-Pierre Drucbert}\\
  carlisle@cs.man.ac.uk}
\date{\filedate}
\maketitle
\DocInput{xr.dtx}
\end{document}
%</driver>
% \fi
%
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% \CheckSum{87}
%
% \changes{v5.00}{1993/07/07}
%         {First DPC version (by agreement with J-PD).  New mechanism
%         (\cmd{\read} instead of \cmd\input).}
%
% \changes{v5.01}{1993/07/20}{Fix bug added by DPC, v5.00 did not import
%           aux files of \cmd\include'ed files. (Reported by J-PD)}
%
% \changes{v5.02}{1994/05/28}{Update for LaTeX2e}
%
%
% This package implements a system for eXternal References.
%
% If one document needs to refer to sections of another, say |aaa.tex|,
% then this package may be loaded in the main file, and the command\\
% |\externaldocument{aaa}|\\
%  given in the preamble.
%
% Then you may use |\ref| and |\pageref| to refer to anything which has
% been given a |\label| in either |aaa.tex| or the main document.
% You may declare any number of such external documents.
%
% If any of the external documents, or the main document, use the same
% |\label| then an error will occur as the label will be multiply
% defined. To overcome this problem |\externaldocument| has an optional
% argument. If you declare |\externaldocument[A-]{aaa}| Then all
% references from |aaa| are prefixed by |A-|. So for instance, if a
% section of |aaa| had |\label{intro}|, then this could be referenced
% with |\ref{A-intro}|. The prefix need not be |A-|, it can be any
% string chosen to ensure that all the labels imported from external
% files are unique. Note however that if your style declares certain
% active characters (|:| in French, |"| in German) then these
% characters can not usually be used in |\label|, and similarly may not
% be used in the optional argument to |\externaldocument|.
%
% \StopEventually{}
%
% \section{The macros}
%
%    \begin{macrocode}
%<*package>
%    \end{macrocode}
%
% Check for the optional argument.
%    \begin{macrocode}
\def\externaldocument{\@ifnextchar[\XR@{\XR@[]}}
%    \end{macrocode}
%
% Save the optional prefix. Start processing the first |aux| file.
%    \begin{macrocode}
\def\XR@[#1]#2{{%
  \makeatletter
  \def\XR@prefix{#1}%
  \XR@next#2.aux\relax\\}}
%    \end{macrocode}
%
% Process the next |aux| file in the list and remove it from the head of
% the list of files to process.
%    \begin{macrocode}
\def\XR@next#1\relax#2\\{%
  \edef\XR@list{#2}%
  \XR@loop{#1}}
%    \end{macrocode}
%
% Check whether the list of |aux| files is empty.
%    \begin{macrocode}
\def\XR@aux{%
  \ifx\XR@list\@empty\else\expandafter\XR@explist\fi}
%    \end{macrocode}
%

% Expand the list of aux files, and call |\XR@next| to process the first
% one.
%    \begin{macrocode}
\def\XR@explist{\expandafter\XR@next\XR@list\\}
%    \end{macrocode}
%
% If the |aux| file exists, loop through line by line, looking for
% |\newlabel| and |\@input|. Otherwise process the next file in the
% list.
%    \begin{macrocode}
\def\XR@loop#1{\openin\@inputcheck#1\relax
  \ifeof\@inputcheck
    \PackageWarning{xr}{^^JNo file #1^^JLABELS NOT IMPORTED.^^J}%
    \expandafter\XR@aux
  \else
    \PackageInfo{xr}{IMPORTING LABELS FROM #1}%
    \expandafter\XR@read\fi}
%    \end{macrocode}
%
% Read the next line of the aux file.
%    \begin{macrocode}
\def\XR@read{%
  \read\@inputcheck to\XR@line
%    \end{macrocode}
% The |...| make sure that |\XR@test| always has sufficient arguments.
%    \begin{macrocode}
  \expandafter\XR@test\XR@line...\XR@}
%    \end{macrocode}
%
% Look at the first token of the line.
% If it is |\newlabel|, do the |\newlabel|. If it is |\@input|, add the
% filename to the list of files to process. Otherwise ignore.
% Go around the loop if not at end of file. Finally process the next
% file in the list.
%    \begin{macrocode}
\long\def\XR@test#1#2#3#4\XR@{%
  \ifx#1\newlabel
    \newlabel{\XR@prefix#2}{#3}%
  \else\ifx#1\@input
     \edef\XR@list{\XR@list#2\relax}%
  \fi\fi
  \ifeof\@inputcheck\expandafter\XR@aux
  \else\expandafter\XR@read\fi}
%    \end{macrocode}
%
%    \begin{macrocode}
%</package>
%    \end{macrocode}
%
% \Finale
%