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1%D \module
2%D   [       file=strc-des,
3%D        version=2008.10.20,
4%D          title=\CONTEXT\ Structure Macros,
5%D       subtitle=Descriptions,
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 / Descriptions}
15
16\unprotect
17
18\installcorenamespace{description}
19
20\installcommandhandler \??description {description} \??description
21
22\let\setupdescriptions\setupdescription
23
24% \setupdescription % check with old
25%   [\c!alternative=\descriptionparameter\c!location,
26%    \c!location=\v!left]
27
28\setupdescription % check with old
29  [\c!alternative=\v!left,
30   \c!headstyle=\v!bold,
31   \c!titlestyle=\v!bold,
32  %\c!style=,
33  %\c!color=,
34  %\c!headcolor=,
35  %\c!titlecolor=,
36   \c!width=7\emwidth,
37   \c!distance=\emwidth,
38   \c!titledistance=.5\emwidth,
39  %\c!hang=,
40  %\c!sample=,
41  %\c!align=,
42  %\c!headalign=,
43   \c!margin=\v!no,
44   \c!before=\blank,
45   \c!inbetween=\blank,
46   \c!after=\blank,
47   \c!indentnext=\v!yes,
48   \c!indenting=\v!never,
49   \c!titleleft=(,
50   \c!titleright=),
51  %\c!closesymbol=,
52   \c!closecommand=\wordright,
53   \c!display=\v!yes,
54  %\c!command=,
55   \c!titlecommand=,
56   \c!expansion=\v!no,
57  %\c!xmlsetup=,
58  %\s!catcodes=,
59   \c!title=\v!yes,
60  %\c!text=,
61  ]
62
63\appendtoks
64    \ifx\currentdescriptionparent\empty
65        \defineconstruction[\currentdescription][\currentdescriptionparent][\s!handler=\v!description,\c!level=1]%
66    \else
67        \defineconstruction[\currentdescription][\s!handler=\v!description,\c!level=1]%
68    \fi
69    \setuevalue        {\currentdescription}{\strc_descriptions_command{\currentdescription}}%
70    \setuevalue{\e!start\currentdescription}{\strc_descriptions_start  {\currentdescription}}%
71    \setuevalue{\e!stop \currentdescription}{\strc_descriptions_stop}%
\to \everydefinedescription
73
74\let\p_strc_constructions_title \empty
75
76\unexpanded\setvalue{\??constructioninitializer\v!description}%
77  {\let\currentdescription              \currentconstruction
78   \let\constructionparameter           \descriptionparameter
79   \let\constructionnamespace           \??description
80   \let\detokenizedconstructionparameter\detokenizeddescriptionparameter
81   \let\letconstructionparameter        \letdescriptionparameter
82   \let\useconstructionstyleandcolor    \usedescriptionstyleandcolor
83   \let\setupcurrentconstruction        \setupcurrentdescription
84   \edef\p_strc_constructions_title{\constructionparameter\c!title}%
85   \ifx\p_strc_constructions_title\v!yes
86     \settrue\c_strc_constructions_title_state
87   \else
88     \setfalse\c_strc_constructions_title_state
89   \fi}
90
91% We keep the command variant around but rather would move to the
92% start-stop one. Also, passing the title as argument has some
93% history so we need to keep that as well.
94
95% \startdescription [reference]                text \stopdescription
96% \startdescription [reference]{title}         text \stopdescription
97% \startdescription [title=,title=,reference=] text \stopdescription
98
99% A bit over the top, the optional title but mkii has it too.
100
101\unexpanded\def\strc_descriptions_start#1%
102  {\begingroup
103   \strc_constructions_initialize{#1}%
104   \doifelsenextoptionalcs\strc_descriptions_start_yes\strc_descriptions_start_nop}
105
106\unexpanded\def\strc_descriptions_start_yes[#1]%
107  {\doifelseassignment{#1}\strc_descriptions_start_yes_assignment\strc_descriptions_start_yes_reference[#1]}
108
109\unexpanded\def\strc_descriptions_start_yes_assignment[#1]% todo userdata
110  {\strc_constructions_register[][\c!label={\descriptionparameter\c!text},\c!reference=,\c!title=,\c!bookmark=,\c!list=,#1]%
111   \csname\??constructionstarthandler\currentconstructionhandler\endcsname}
112
113\unexpanded\def\strc_descriptions_start_yes_reference
114  {\ifconditional\c_strc_constructions_title_state
115     \expandafter\strc_descriptions_start_yes_titled
116   \else
117     \expandafter\strc_descriptions_start_yes_normal
118   \fi}
119
120\unexpanded\def\strc_descriptions_start_yes_titled[#1]%
121  {\doifelsenextbgroup
122     {\strc_descriptions_start_yes_titled_indeed[#1]}%
123     {\setfalse\c_strc_constructions_title_state
124      \strc_descriptions_start_yes_normal[#1]}}
125
126\unexpanded\def\strc_descriptions_start_yes_titled_indeed[#1]#2% todo userdata
127  {\strc_constructions_register[][\c!label={\descriptionparameter\c!text},\c!reference={#1},\c!title={#2},\c!bookmark=,\c!list=]%
128   \csname\??constructionstarthandler\currentconstructionhandler\endcsname}
129
130\unexpanded\def\strc_descriptions_start_yes_normal[#1]% todo userdata
131  {\strc_constructions_register[][\c!label={\descriptionparameter\c!text},\c!reference={#1},\c!title=,\c!bookmark=,\c!list=]%
132   \csname\??constructionstarthandler\currentconstructionhandler\endcsname}
133
134\unexpanded\def\strc_descriptions_start_nop
135  {\ifconditional\c_strc_constructions_title_state
136     \expandafter\strc_descriptions_start_nop_titled
137   \else
138     \expandafter\strc_descriptions_start_nop_normal
139   \fi}
140
141\unexpanded\def\strc_descriptions_start_nop_titled
142  {\doifelsenextbgroup
143     {\strc_descriptions_start_nop_titled_indeed}%
144     {\setfalse\c_strc_constructions_title_state
145      \strc_descriptions_start_nop_normal}}%
146
147\unexpanded\def\strc_descriptions_start_nop_titled_indeed#1%
148  {\strc_constructions_register[][\c!label={\descriptionparameter\c!text},\c!reference=,\c!title={#1},\c!bookmark=,\c!list=]%
149   \csname\??constructionstarthandler\currentconstructionhandler\endcsname}
150
151\unexpanded\def\strc_descriptions_start_nop_normal
152  {\strc_constructions_register[][\c!label={\descriptionparameter\c!text},\c!reference=,\c!title=,\c!bookmark=,\c!list=]%
153   \csname\??constructionstarthandler\currentconstructionhandler\endcsname}
154
155\unexpanded\def\strc_descriptions_stop
156  {\csname\??constructionstophandler\currentconstructionhandler\endcsname}
157
158% \description [reference]         text \par
159% \description [reference] {title} text \par
160
161\unexpanded\def\strc_descriptions_command#1%
162  {\begingroup
163   \strc_constructions_initialize{#1}%
164   \doifelsenextoptionalcs\strc_descriptions_yes\strc_descriptions_nop}
165
166\unexpanded\def\strc_descriptions_yes
167  {\ifconditional\c_strc_constructions_title_state
168     \expandafter\strc_descriptions_yes_titled
169   \else
170     \expandafter\strc_descriptions_yes_normal
171   \fi}
172
173\unexpanded\def\strc_descriptions_yes_titled[#1]#2%
174  {\strc_constructions_register[][\c!label={\descriptionparameter\c!text},\c!reference={#1},\c!title={#2},\c!bookmark=,\c!list=]%
175   \csname\??constructioncommandhandler\currentconstructionhandler\endcsname}
176
177\unexpanded\def\strc_descriptions_yes_titled[#1]%
178  {\doifelsenextbgroup
179     {\strc_descriptions_yes_titled_indeed[#1]}%
180     {\setfalse\c_strc_constructions_title_state
181      \strc_descriptions_yes_normal[#1]}}
182
183\unexpanded\def\strc_descriptions_yes_titled_indeed[#1]#2%
184  {\strc_constructions_register[][\c!label={\descriptionparameter\c!text},\c!reference={#1},\c!title={#2},\c!bookmark=,\c!list=]%
185   \csname\??constructioncommandhandler\currentconstructionhandler\endcsname}
186
187\unexpanded\def\strc_descriptions_yes_normal[#1]%
188  {\strc_constructions_register[][\c!label={\descriptionparameter\c!text},\c!reference={#1},\c!title=,\c!bookmark=,\c!list=]%
189   \csname\??constructioncommandhandler\currentconstructionhandler\endcsname}
190
191\unexpanded\def\strc_descriptions_nop
192  {\ifconditional\c_strc_constructions_title_state
193     \expandafter\strc_descriptions_nop_titled
194   \else
195     \expandafter\strc_descriptions_nop_normal
196   \fi}
197
198\unexpanded\def\strc_descriptions_nop_titled
199  {\doifelsenextbgroup
200     {\strc_descriptions_nop_titled_indeed}%
201     {\setfalse\c_strc_constructions_title_state
202      \strc_descriptions_nop_normal}}
203
204\unexpanded\def\strc_descriptions_nop_titled_indeed#1%
205  {\strc_constructions_register[][\c!label={\descriptionparameter\c!text},\c!reference=,\c!title={#1},\c!bookmark=,\c!list=]%
206   \csname\??constructioncommandhandler\currentconstructionhandler\endcsname}
207
208\unexpanded\def\strc_descriptions_nop_normal
209  {\strc_constructions_register[][\c!label={\descriptionparameter\c!text},\c!reference=,\c!title=,\c!bookmark=,\c!list=]%
210   \csname\??constructioncommandhandler\currentconstructionhandler\endcsname}
211
212%D Handlers:
213
214\expandafter\let\csname\??constructionmainhandler   \v!description\expandafter\endcsname\csname\??constructionmainhandler   \v!construction\endcsname
215\expandafter\let\csname\??constructioncommandhandler\v!description\expandafter\endcsname\csname\??constructioncommandhandler\v!construction\endcsname
216\expandafter\let\csname\??constructiontexthandler   \v!description\expandafter\endcsname\csname\??constructiontexthandler   \v!construction\endcsname
217
218\unexpanded\setvalue{\??constructioncommandhandler\v!description}%
219  {\dowithpar
220     {\csname\??constructionstarthandler\v!construction\endcsname}%
221     {\csname\??constructionstophandler \v!construction\endcsname\endgroup}}
222
223\unexpanded\setvalue{\??constructionstarthandler\v!description}%
224  {\dogotopar
225     {\csname\??constructionstarthandler\v!construction\endcsname}}
226
227\unexpanded\setvalue{\??constructionstophandler\v!description}%
228  {\csname\??constructionstophandler\v!construction\endcsname
229   \endgroup}
230
231%D For historic reasons we have (from now on undocumented):
232
\definedescription
234  [tab]
235  [\c!alternative=\v!left,
236   \c!headstyle=\v!normal,
237   \c!headcolor=,
238   \c!style=\v!normal,
239   \c!color=,
240   \c!width=\v!broad,
241   \c!sample=\kern4\emwidth, % was \hskip but that no longer is okay
242   \c!before=,
243   \c!after=]
244
245\unexpanded\def\setuptab
246  {\setupdescription[tab]}
247
248%D Maybe we should remove this definition.
249
250\protect \endinput
251