summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/source/latex/expl3/l3chk.dtx
blob: 56b9cf5c34c0615273038cdfa456d3a7275471f4 (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
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
% \iffalse
%% File: l3chk.dtx Copyright (C) 1990-1998 LaTeX3 project
%
%<*dtx>
          \ProvidesFile{l3chk.dtx}
%</dtx>
%<package>\NeedsTeXFormat{LaTeX2e}
%<package>\ProvidesPackage{l3chk}
%<driver> \ProvidesFile{l3chk.drv}
% \fi
%         \ProvidesFile{l3chk.dtx}
          [1998/04/20 v1.0e L3 Experimental check module]
%
% \iffalse
%<*driver>
\documentclass{l3doc}

\begin{document}
\DocInput{l3chk.dtx}
\end{document}
%</driver>
% \fi
%
% \GetFileInfo{l3chk.dtx}
% \title{The \textsf{l3chk} package\thanks{This file
%         has version number \fileversion, last
%         revised \filedate.}\\
% Checking things\ldots}
% \author{\Team}
% \date{\filedate}
% \maketitle
%
% \section{The chk module}
%
% To ensure that functions and variables are properly used certain
% checking functions are implemented that may or may not be compiled
% into the final format.
% 
% \subsection{Functions}
% 
% \begin{function}{%
%                  \chk_var_or_const:N |
% }
% \begin{syntax}
%   "\chk_var_or_const:N" <cs>
% \end{syntax}
% Checks that <cs> is a proper variable or constant which means that its
% name starts out with "\L", "\l", "\G", "\g", "\R", "\C", "\c", or "\q".
% \end{function}
% 
% \begin{function}{%
%                  \chk_local:N |
%                  \chk_global:N |
% }
% \begin{syntax}
%   "\chk_local:N" <cs>
% \end{syntax}
% Checks that <cs> is a proper local or global variable. This means that
% its name starts out with "\L", "\l", or "\G", "\g" respectively.
% \end{function}
% 
% \begin{function}{%
%                  \chk_local_or_pref_global:N |
%                  \pref_global_chk: |
% }
% To allow implementations where we precede some function with
% "\pref_global:D" without loosing the possibility to check for the
% correct variable type the following helper functions can be used:
% "\chk_local_or_pref_global:N" <cs> is the variable check which is
% usually let to "\chk_local:N", i.e.\ it will check that its argument
% is a local variable. This behavior will be changed by
% "\pref_global_chk:".  This function first changes
% "\chk_local_or_pref_global:N" to check for global variables then it
% issues a "\pref_global:D". After use "\chk_local_or_pref_global:N"
% will restore itself to "\chk_local:N".  So, if we use
% "\chk_local_or_pref_global:N" inside some function "\foo_bar:n" we can
% implement a global version "\foo_gbar:n" by defining
% \begin{quote}
%    "\def_new:Npn \foo_gbar:n {\pref_global_chk: \foo_bar:n }"
% \end{quote}
% provided that "\foo_bar:n" is built in a way that prefixing it with
% "\pref_global:D" turns its operation into a global one. See
% implementation for details.
% \end{function}
% 
% \subsection{Constants}
% 
% \begin{variable}{\c_undefined}
% This constant is always undefined and therefore can be used to check
% for free function names.
% \end{variable}
% 
% \subsection{Internal functions}
% 
% \begin{function}{%
%                  \chk_global_aux:w |
%                  \chk_local_aux:w |
%                  \chk_var_or_const_aux:w |
% }
% Helper functions that implement the checking.
% \end{function}
%
% \StopEventually{}
%
%    \section{The code}
%
%    We start by ensuring that the required packages are loaded.
%    \begin{macrocode}
%<package>\RequirePackage{l3basics}
%<package>\RequirePackage{l3int}
%<*package>
%    \end{macrocode}
%
% The |\chk| module contains those functions that are used primarily
% during the development of \LaTeX3 for checking that things are not mixed up
% too badly.  All these functions are of type `{\tt e}' since they
% issue error messages if certain conditions are violated.
%
% \subsection{Checking variable assignments}
%
% \begin{macro}{\chk_local:N}
% \begin{macro}{\chk_local_aux:w}
%    This function checks that its argument is a proper local
%    variable, i.e.\ its name starts with |\l| or |\L|. 
%    It is not allowed that the name starts with |\g| or |\G|,
%    which means that we do not allow to update global
%    variables locally. But see |\pref_global_chk:| below for 
%    the encoding of functions that might accept global variables
%    in certain situations.  Not checked is the case that the
%    argument isn't a variable at all, i.e.\ it doesn't have 
%    a |_| as second letter. Maybe we should add this for safety
%    during the implementation since it will find certain errors
%    involving wrong expansion in earlier stage.
%    \begin{macrocode}
\def_new:Npn \chk_local:N #1{\exp_after:NN
                           \chk_local_aux:w \token_to_string:N#1\q_stop}
\def_new:Npn \chk_local_aux:w #1#2#3\q_stop{
   \if_num:w\tex_uccode:D`#2=`G\scan_stop:
       \err_latex_bug:n{Local~mismatch:~local~function~called~with~
                     global~variable:^^J\text_put_four_sp: #1#2#3~
                     on~line~\tex_the:D\tex_inputlineno:D}
   \else:
     \if_num:w\tex_uccode:D`#2=`L\scan_stop:
     \else:
       \err_latex_bug:n{Variable~mismatch:~function~not~called~with~
                     proper~variable:^^J\text_put_four_sp: #1#2#3~
                     on~line~\tex_the:D\tex_inputlineno:D}\fi:
   \fi:}
%    \end{macrocode}
%    We set the |\l_iow_new_line_code| at this point, just in case we
%    run into errors.
%    \begin{macrocode}
\tex_newlinechar:D=`\^^J
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\chk_global:N}
% \begin{macro}{\chk_global_aux:w}
%    |\chk_global:N| is similar to |\chk_local:N| but looks only
%    for global variables.
%    \begin{macrocode}
\def_new:Npn \chk_global:N #1{\exp_after:NN
                           \chk_global_aux:w \token_to_string:N#1\q_stop}
\def_new:Npn \chk_global_aux:w #1#2#3\q_stop{
   \if_num:w\tex_uccode:D`#2=`L\scan_stop:
       \err_latex_bug:n{Global~mismatch:~global~function~called~with~
                   local~variable:~#1#2#3~
                   on~line~\tex_the:D\tex_inputlineno:D}
   \else:
     \if_num:w\tex_uccode:D`#2=`G\scan_stop:
     \else:
       \err_latex_bug:n{Variable~mismatch:~function~not~called~with~
                     proper~variable:~#1#2#3~
                     on~line~\tex_the:D\tex_inputlineno:D}\fi:\fi:}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\pref_global_chk:}
% \begin{macro}{\chk_local_or_pref_global:N}
%    To allow implementations where we precede some function with
%    |\pref_global:D| without loosing the possibility to check for the
%    correct type of a variable, the following helper functions can be
%    used: |\chk_local_or_pref_global:N| \m{variable} is the variable
%    check which is usually |\let:NN| to |\chk_local:N|, i.e.\ it will
%    check for local variables. This behavior will be changed by
%    |\pref_global_chk:|.  This function first changes
%    |\chk_local_or_pref_global:N| to check for global variables, then
%    issues a |\pref_global:D|. After being used,
%    |\chk_local_or_pref_global:N| will restore itself to
%    |\chk_local:N|. So, if we use |\chk_local_or_pref_global:N|
%    inside some function |\foo_bar:n| we can implement a global
%    version |\foo_gbar:n| by defining
%    \begin{verbatim}
%       \def_new:Npn \foo_gbar:n {\pref_global_chk: \foo_bar:n }
%\end{verbatim}
%    provided of course, that |\foo_bar:n| is defined in a way that a
%    |\pref_global:D| does work. Such a scheme has to be used
%    carefully, but its advantage is that the checking version has the
%    same structure as a streamlined version, we only have to change
%    |\pref_global_chk:| into |\pref_global:D| and omit the
%    |\chk_local_or_pref_global:N| function in the body.
%    \begin{macrocode}
\def_new:Npn \pref_global_chk: {
    \gdef:Npn \chk_local_or_pref_global:N ##1{
          \chk_global:N ##1
          \glet:NN \chk_local_or_pref_global:N \chk_local:N}
    \pref_global:D}
\let_new:NN \chk_local_or_pref_global:N \chk_local:N
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\chk_var_or_const:N}
% \begin{macro}{\chk_var_or_const_aux:w}
%    |\chk_var_or_const:N| is used in situations where we want to check
%    that we have a variable (or a constant) but do not care whether
%    or not it is global (for example, in allocation routines).
%    \begin{macrocode}
\def_new:Npn \chk_var_or_const:N #1{\exp_after:NN
     \chk_var_or_const_aux:w \token_to_string:N#1\q_stop }
\def_new:Npn \chk_var_or_const_aux:w #1#2#3\q_stop {
    \if_num:w\tex_uccode:D`#2=`L\scan_stop:
    \else:
      \if_num:w\tex_uccode:D`#2=`G\scan_stop:
      \else:
        \if_num:w\tex_uccode:D`#2=`C\scan_stop:
        \else:
%    \end{macrocode}
%    We also allow the beast to be a quark, i.e.\ to start with |\q|.
%    \begin{macrocode}
          \if_char_code:w#2q\scan_stop:
          \else:
%    \end{macrocode}
%    We might also want to allow that it is a user definable
%    variable which means that its name consists of letters only. We
%    could check this by testing that there is no |_|, but this is not
%    implemented so far.
%    \begin{macrocode}
           \err_latex_bug:n{Variable~mismatch:~function~not~called~with~
                       proper~variable:^^J\text_put_four_sp: #1#2#3~
                       on~line~\tex_the:D\tex_inputlineno:D}\fi:\fi:\fi:
    \fi:}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
%
% \subsection{Doing some tracing}
%
%  \begin{macro}{\tracingall}
%  \begin{macro}{\absolutelytracingall}
%  \begin{macro}{\donotcheck}
%    During |\tracingall| we don't want to see all this code coming
%    from the checking functions since something more substantial is
%    probably wrong. Therefore this definition of it turns the
%    functions of as far as possible.
%    \begin{macrocode}
\def_new:Npn\donotcheck{
  \let:NN \chk_global:N \use_none:n
  \let:NN \chk_local:N \use_none:n
  \let:NN \chk_local_or_pref_global:N \use_none:n
  \let:NN \pref_global_chk: \pref_global:D
  \let:NN \chk_new_cs:N \use_none:n
  \let:NN \chk_exist_cs:N \use_none:n
  \let:NN \chk_var_or_const:N \use_none:n
  \let:NN \cs_record_name:N \use_none:n
  \let:NN \cs_record_name:c \use_none:n
  \let:NN \cs_record_meaning:N \use_none:n
  \let:NN \register_record_name:N \use_none:n
}
\def_new:Npn\absolutelytracingall{
%    \end{macrocode}
%  \end{macro}
%
%    We do the settings by hand to avoid uninteresting lines in the
%    log file as much as possible.
%    \begin{macrocode}
  \pref_global:D\g_trace_commands_status\c_two
  \pref_global:D\g_trace_statistics_status\c_two
  \pref_global:D\g_trace_pages_status\c_one
  \pref_global:D\g_trace_output_status\c_one
  \pref_global:D\g_trace_chars_status\c_one
  \pref_global:D\g_trace_macros_status\c_two
  \pref_global:D\g_trace_paragraphs_status\c_one
  \pref_global:D\g_trace_restores_status\c_one
  \pref_global:D\g_trace_box_breadth_int\c_ten_thousand
  \pref_global:D\g_trace_box_depth_int\c_ten_thousand
  \pref_global:D\g_trace_online_status\c_one
  \mode_errorstop:D}
%
% Use LaTeX2e definition for now.
%\def_new:Npn\tracingall{
%  \donotcheck
%  \absolutelytracingall
%}
%    \end{macrocode}
%  \end{macro}
%  \end{macro}
%
%  \begin{macro}{\tracingoff}
%    This macro turns off all tracing.
%    \begin{macrocode}
\def_new:Npn\tracingoff{
%    \end{macrocode}
%    First we turn off |\g_trace_online_status| so that we get minimal
%    rubbish on the terminal. Of course, in the log file all
%    assignments are shown.
%    \begin{macrocode}
  \pref_global:D\g_trace_online_status\c_zero
  \pref_global:D\g_trace_commands_status\c_zero
  \pref_global:D\g_trace_statistics_status\c_zero
  \pref_global:D\g_trace_pages_status\c_zero
  \pref_global:D\g_trace_output_status\c_zero
  \pref_global:D\g_trace_chars_status\c_zero
  \pref_global:D\g_trace_macros_status\c_zero
  \pref_global:D\g_trace_paragraphs_status\c_zero
  \pref_global:D\g_trace_restores_status\c_zero
  \pref_global:D\g_trace_box_breadth_int\c_zero
  \pref_global:D\g_trace_box_depth_int\c_zero
}
%    \end{macrocode}
%  \end{macro}
%
% \subsection{Tracing modules}
%
%  \begin{macro}{\traceon}
%  \begin{macro}{\traceoff}
%    Turning the tracing of modules on or off. (primitive version).
%    \begin{macrocode}
%<*trace>
\def_new:Npn\traceon#1{\for_clist:Nnn\l_tmpa_tlp{#1}
         {
          \cs_free:cF{g_trace_\l_tmpa_tlp _status}
            {\int_gincr:c{g_trace_\l_tmpa_tlp _status}}
         }}
\def_new:Npn\traceoff#1{\for_clist:Nnn\l_tmpa_tlp{#1}
         {
          \cs_free:cF{g_trace_\l_tmpa_tlp _status}
            {\int_gdecr:c{g_trace_\l_tmpa_tlp _status}}
         }}
%</trace>
%<-trace>\let_new:NN\traceon\use_none:n
%<-trace>\let_new:NN\traceoff\use_none:n
%</package>
%    \end{macrocode}
%  \end{macro}
%  \end{macro}
%
%
%    Show token usage:
%    \begin{macrocode}
%<*showmemory>
\showMemUsage
%</showmemory>
%    \end{macrocode}
%