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1%D \module
2%D   [       file=strc-enu, % moved from strc-des
3%D        version=2008.10.20,
4%D          title=\CONTEXT\ Structure Macros,
5%D       subtitle=Enumerations,
6%D         author=Hans Hagen,
7%D           date=\currentdate,
8%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
9%C
10%C This module is part of the \CONTEXT\ macro||package and is
11%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
12%C details.
13
14\writestatus{loading}{ConTeXt Structure Macros / Enumerations}
15
16\unprotect
17
18% command -> headcommand
19
20%D Enumerations are just super descriptions. Therefore we implement
21%D them as an extension. After all, the keys don't clash. In order
22%D to be able to differentiate between specific settings we use
23%D some flags. Unfortunately we have some historic differences
24%D in default values. Therefore we push an extra step in the
25%D parent chain (we might do the same for regular descriptions).
26
27%D In order to be more flexible with theorems Aditya Mahajan added
28%D support for titles and endsymbols. At the same time we added more
29%D flexible support for inheriting numbers.
30%D
31%D \startbuffer
32%D \defineenumeration[one]
33%D \defineenumeration[two]   [one] % clone one
34%D \defineenumeration[three] [counter=one,style=slanted] % only use counter of one
35%D \defineenumeration[four]  [three] % clone three
36%D \defineenumeration[five]  [three] [counter=five] % clone three and use own counter
37%D \defineenumeration[six]   [three] [counter=four] % clone tree and use counter four (undefined)
38%D
39%D \startone   test test  6 \stopone
40%D \starttwo   test test  7 \stoptwo
41%D \startthree test test  8 \stopthree
42%D \startfour  test test  9 \stopfour
43%D \startfive  test test  2 \stopfive
44%D \startsix   test test 10 \stopsix
45%D \stopbuffer
46%D
47%D \typebuffer \start \getbuffer \stop
48%D
49%D \starttyping
50%D \setupenumerations[one]  [prefix=yes,prefixsegments=section]
51%D \setupenumerations[two]  [prefix=yes,prefixsegments=section]
52%D \setupenumerations[three][prefix=yes,prefixsegments=section]
53%D \setupenumerations[four] [prefix=yes,prefixsegments=chapter:section]
54%D \setupenumerations[five] [prefix=yes,prefixsegments=chapter:section]
55%D \setupenumerations[six]  [prefix=yes,prefixsegments=chapter:section]
56%D \stoptyping
57
58% list and titles are experimental
59%
60% \definedescription[test] [location=left,hang=4,headalign={right},distance=1em,list=test]
61% \defineenumeration[lemma][title=yes,right=:,textdistance=1em, location=top, titlestyle=\bs,list=lemma]
62% \defineenumeration[ammel][title=yes,right=:,textdistance=.5em,location=left,titlestyle=\it,width=9em]
63%
64% \placelist[enumeration:lemma]
65% \placelist[description:test][width=0pt]
66%
67% \starttest  {something something something}    \input zapf  \stoptest
68% \startlemma {with a title of a certain length} \input tufte \stoplemma
69% \startammel {with a title}                     \input zapf  \stopammel
70%
71% \defineenumeration[lemma][...]
72% \defineenumeration[titledlemma][lemma][title=yes,right=:,text=lemma,list=lemma]
73
74\installcorenamespace{enumeration}
75
76\installcommandhandler \??enumeration {enumeration} \??enumeration
77
78\installcounterassociation{enumeration}
79
80\let\setupenumerations\setupenumeration
81
82\setupenumeration % check with old
83  [\c!alternative=\v!top,
84   \c!headstyle=\v!bold,
85   \c!titlestyle=\v!bold,
86  %\c!style=,
87  %\c!color=,
88  %\c!headcolor=,
89  %\c!titlecolor=,
90   \c!width=8\emwidth,
91  %\c!distance=\zeropoint,
92   \c!distance=\emwidth,
93   \c!titledistance=.5\emwidth,
94  %\c!hang=,
95  %\c!sample=,
96  %\c!align=,
97  %\c!headalign=,
98   \c!margin=\v!no,
99   \c!before=\blank,
100   \c!inbetween=\blank,
101   \c!after=\blank,
102   \c!indentnext=\v!yes,
103   \c!indenting=\v!never,
104   \c!titleleft=(,
105   \c!titleright=),
106  %\c!closesymbol=,
107   \c!closecommand=\wordright,
108   \c!display=\v!yes,
109  %\c!command=,
110   \c!titlecommand=,
111   \c!expansion=\v!no,
112  %\c!xmlsetup=,
113  %\s!catcodes=,
114   \c!way=\v!by\v!text,
115   \c!prefix=\v!no,
116   \c!prefixconnector=.,
117  %\c!starter=,
118  %\c!stopper=,
119   \c!text=\currentenumeration,
120   \c!number=\v!yes, % else description
121   \c!start=0,
122   \c!state=\v!start,
123   \c!levels=4]
124
125% to be considered:
126%
127% \let\??construction\??enumeration
128%
129% with push/pop (also at definition time)
130
131\unexpanded\def\strc_define_commands_enumeration#tag#level#parent%
132  {\doifelsenothing{#parent}
133     {\normalexpanded{\defineconstruction[#tag][\s!handler=\v!enumeration,\c!level=#level]}%
134      \setevalue{\??enumeration#tag:\s!parent}{\??enumeration}}%
135     {\normalexpanded{\defineconstruction[#tag][#parent][\s!handler=\v!enumeration,\c!level=#level]}%
136      \setevalue{\??enumeration#tag:\s!parent}{\??enumeration#parent}}%
137   \setuevalue{\e!next #tag}{\strc_enumerations_next   {#tag}{\number#level}}% obsolete
138   \setuevalue{\c!reset#tag}{\strc_enumerations_reset  {#tag}{\number#level}}% obsolete
139   %setuevalue{\c!set  #tag}{\strc_enumerations_set    {#tag}{\number#level}}% obsolete
140   \setuevalue        {#tag}{\strc_enumerations_command{#tag}}% we could pass level here as well (faster)
141   \setuevalue{\e!start#tag}{\strc_enumerations_start  {#tag}}% we could pass level here as well (faster)
142   \setuevalue{\e!stop #tag}{\strc_enumerations_stop   }}
143
144\appendtoks
145    \ifx\currentenumerationparent\empty
146       % clone => parent | subclone => clone | subsubclone => subclone
147       \let\currentenumerationsub\empty
148       \strc_define_commands_enumeration
149         {\currentenumerationsub\currentenumeration}%
150         \plusone
151         \empty
152       \edef\p_levels{\enumerationparameter\c!levels}%
153       \dostepwiserecurse\plustwo\p_levels\plusone
154         {\strc_define_commands_enumeration
155            {\v!sub\currentenumerationsub\currentenumeration}%
156            \recurselevel
157            {\currentenumerationsub\currentenumeration}%
158          \edef\currentenumerationsub{\v!sub\currentenumerationsub}}%
159   \else
160       % clone => parent | subclone => subparent | subsubclone => subsubparent
161       \let\currentenumerationsub\empty
162       \edef\p_levels{\enumerationparameter\c!levels}%
163       \dorecurse\p_levels
164         {\strc_define_commands_enumeration
165            {\currentenumerationsub\currentenumeration}%
166            \recurselevel
167            {\currentenumerationsub\currentenumerationparent}%
168          \edef\currentenumerationsub{\v!sub\currentenumerationsub}}%
169   \fi
170   \edef\p_counter{\enumerationparameter\s!counter}% can inherit from parent
171   \ifx\p_counter\empty %
172       \let\p_counter\currentenumeration
173   \fi
174   \doifelsecounter\p_counter\donothing{\strc_enumerations_define_counter\p_counter}%
175   \letenumerationparameter\s!counter\p_counter
176  %\strc_enumerations_setup_counter\currentenumeration
177\to \everydefineenumeration
178
179\let\p_strc_constructions_title \empty
180\let\p_strc_constructions_number\empty
181
182\unexpanded\setvalue{\??constructioninitializer\v!enumeration}%
183  {\let\currentenumeration              \currentconstruction
184   \let\constructionparameter           \enumerationparameter
185   \let\constructionnamespace           \??enumeration
186   \let\detokenizedconstructionparameter\detokenizedenumerationparameter
187   \let\letconstructionparameter        \letenumerationparameter
188   \let\useconstructionstyleandcolor    \useenumerationstyleandcolor
189   \let\setupcurrentconstruction        \setupcurrentenumeration
190   \edef\p_strc_constructions_number{\constructionparameter\c!number}%
191   \ifx\p_strc_constructions_number\v!yes
192     \settrue\c_strc_constructions_number_state
193     \iftrialtypesetting
194       \strc_counters_save\currentconstructionnumber
195     \fi
196     \strc_counters_increment_sub\currentconstructionnumber\currentconstructionlevel
197   \else
198     \setfalse\c_strc_constructions_number_state
199   \fi
200   \edef\p_strc_constructions_title{\constructionparameter\c!title}%
201   \ifx\p_strc_constructions_title\v!yes
202     \settrue\c_strc_constructions_title_state
203   \else
204     \setfalse\c_strc_constructions_title_state
205   \fi}
206
207\unexpanded\setvalue{\??constructionfinalizer\v!enumeration}%
208  {\ifconditional\c_strc_constructions_number_state
209     \iftrialtypesetting
210       \strc_counters_restore\currentconstructionnumber
211     \fi
212   \fi}
213
214%D Interfaces:
215
216\let\strc_enumerations_command\strc_descriptions_command
217\let\strc_enumerations_start  \strc_descriptions_start
218\let\strc_enumerations_stop   \strc_descriptions_stop
219
220\unexpanded\def\strc_enumerations_next {\strc_constructions_next_indeed \namedenumerationparameter} % #1#2
221\unexpanded\def\strc_enumerations_reset{\strc_constructions_reset_indeed\namedenumerationparameter} % #1#2
222%unexpanded\def\strc_enumerations_set  {\strc_constructions_set_indeed  \namedenumerationparameter} % #1#2
223
224%D Counters (maybe we can share this code): (not ok yet, messy with notes)
225
226% Maybe we should move counters to the construction level as more derived mechanisms
227% use it \unknown\ so don't depend on names here!
228
229\def\strc_enumerations_define_counter#tag% todo: move inline
230  {\definecounter[#tag]%
231   \registerenumerationcounter{#tag}}
232
233\appendtoks
234    \synchronizeenumerationcounters
235\to \everysetupenumeration
236
237\appendtoks
238    \synchronizeenumerationcounters
239\to \everydefineenumeration
240
241%D Initializer:
242
243%D The handlers.
244
245\newtoks\everyenumeration
246
247\appendtoks
248    \disablepseudocaps % sorry, uppercase causes troubles
249\to \everyenumeration
250
251\expandafter\let\csname\??constructionmainhandler   \v!enumeration\expandafter\endcsname\csname\??constructionmainhandler   \v!description\endcsname
252\expandafter\let\csname\??constructioncommandhandler\v!enumeration\expandafter\endcsname\csname\??constructioncommandhandler\v!description\endcsname
253\expandafter\let\csname\??constructionstarthandler  \v!enumeration\expandafter\endcsname\csname\??constructionstarthandler  \v!description\endcsname
254\expandafter\let\csname\??constructionstophandler   \v!enumeration\expandafter\endcsname\csname\??constructionstophandler   \v!description\endcsname
255
256\unexpanded\setvalue{\??constructiontexthandler\v!enumeration}%
257  {\begingroup
258   \useconstructionstyleandcolor\c!headstyle\c!headcolor
259   \strc_enumerations_text
260   \endgroup}
261
262\unexpanded\def\strc_enumerations_text
263  {\the\everyenumeration % will become obsolete
264   \ifconditional\c_strc_constructions_number_state
265     \ifx\currentconstructionreference\!!plustoken
266       \strc_enumerations_full_number_symbol
267     \else\ifx\currentconstructionreference\!!minustoken
268       \strc_enumerations_full_number_nop
269     \else
270       \strc_enumerations_full_number_coupling
271     \fi\fi
272   \else
273     \strc_enumerations_full_number_nop
274   \fi}
275
276\unexpanded\def\strc_enumerations_inject_text_with_space
277  {\edef\p_text{\constructionparameter\c!text}%
278   \ifx\p_text\empty \else
279      \p_text
280      \removeunwantedspaces
281      \nobreakspace
282   \fi}
283
284\unexpanded\def\strc_enumerations_inject_extra_text
285  {\ifconditional\c_strc_constructions_title_state
286     \clf_doifelselisthastitle{\currentconstructionmain}\numexpr\currentconstructionlistentry\relax
287       \strc_enumerations_inject_extra_text_indeed
288       \donothing
289   \fi}
290
291\unexpanded\def\strc_enumerations_inject_text
292  {\constructionparameter\c!numbercommand
293    {\constructionparameter\c!text}}
294
295% head ( number title )
296
297\unexpanded\def\strc_enumerations_inject_extra_text_indeed
298  {\begingroup
299   \hskip\constructionparameter\c!titledistance % we listen to the headstyle
300   \useconstructionstyleandcolor\c!titlestyle\c!titlecolor
301   \constructionparameter\c!titlecommand
302     {\constructionparameter\c!titleleft
303      \clf_savedlisttitle{\currentconstructionmain}\currentconstructionlistentry\relax
304      \constructionparameter\c!titleright}%
305   \endgroup}
306
307\unexpanded\def\strc_enumerations_inject_symbol % todo check
308  {\constructionparameter\c!left
309   \constructionparameter\c!symbol
310   \constructionparameter\c!right}
311
312\unexpanded\def\strc_enumerations_inject_number
313  {\constructionparameter\c!left
314   \constructionparameter\c!starter
315   \clf_savedlistprefixednumber{\currentconstructionmain}\currentconstructionlistentry\relax
316   \constructionparameter\c!stopper
317   \constructionparameter\c!right}
318
319\unexpanded\def\strc_enumerations_inject_text_and_number
320  {\constructionparameter\c!numbercommand
321     {\strc_enumerations_inject_text_with_space
322      \strc_enumerations_inject_number}}
323
324\unexpanded\def\strc_enumerations_inject_text_and_symbol
325  {\constructionparameter\c!numbercommand
326     {\strc_enumerations_inject_text_with_space
327      \strc_enumerations_inject_symbol}}
328
329\unexpanded\def\strc_enumerations_full_number_yes
330  {\constructionparameter\c!headcommand
331     {\begstrut
332      \strc_enumerations_inject_text_and_number
333      \strc_enumerations_inject_extra_text
334      \endstrut}}
335
336\unexpanded\def\strc_enumerations_full_number_nop
337  {\constructionparameter\c!headcommand
338     {\begstrut
339      \strc_enumerations_inject_text
340      \strc_enumerations_inject_extra_text
341      \endstrut}}
342
343\unexpanded\def\strc_enumerations_full_number_symbol
344  {\constructionparameter\c!headcommand
345     {\begstrut
346      \strc_enumerations_inject_text_and_symbol
347      \strc_enumerations_inject_extra_text
348      \endstrut}}
349
350% to be used in for instance:
351%
352% coupling=questions .... coupling=answers
353%
354% we will provide some more control, like skipping etc or reference relates
355
356% to do / to be checked
357
358\unexpanded\def\strc_enumerations_full_number_coupling
359  {\iflocation
360     \strc_enumerations_full_number_yes
361   \else
362     \iftrialtypesetting \else
363       % \doenumerationregistercoupling
364     \fi
365     \strc_enumerations_full_number_yes
366     \edef\p_coupling{\constructionparameter\c!coupling}%
367     \ifx\p_coupling\empty \else
368       \symbolreference[order(construction:\p_coupling:\the\locationorder)]%
369     \fi
370   \fi}
371
372\unexpanded\def\strc_enumerations_skip_number_coupling[#tag]% e.g. for questions with no answer
373  {\clf_setnextreferenceorder{construction}{#tag}}
374
375\protect \endinput
376