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1%D \module
2%D   [       file=strc-blk,
3%D        version=2008.10.20,
4%D          title=\CONTEXT\ Structure Macros,
5%D       subtitle=Blockmoves,
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 / Blockmoves}
15
16\registerctxluafile{strc-blk}{}
17
18\unprotect
19
20% we run on top of buffers and sections
21%
22% todo: prefix numbers (needs further integration elsewhere)
23%       check functionality
24%       alternative files (needs further integration elsewhere)
25%
26% order matters: \c!before (think of: \c!before=\startitemize)
27%
28% no \endgroups
29
30\installcorenamespace {block}
31\installcorenamespace {blocktemp}
32
33\installcommandhandler \??block {block} \??block
34
35\appendtoks
36    \clf_definestructureblock{\currentblock}%
37    \setuevalue{\e!begin\currentblock}{\strc_blocks_begin{\currentblock}}%
38    \letvalue  {\e!end  \currentblock}\donothing
39\to \everydefineblock
40
41% The naive way:
42%
43% \unexpanded\def\strc_blocks_begin#1%
44%   {\dotripleempty\strc_blocks_begin_indeed[#1]}
45%
46% \unexpanded\def\strc_blocks_begin_indeed[#1][#2][#3]%
47%   {\normalexpanded{\buff_pickup{\??block}{\e!begin#1}{\e!end#1}}
48%      {}%
49%      {\clf_savestructureblock{#1}{#2}{#3}{\??block}}%
50%      \plusone}%
51%
52% We need to prevent too much lookahead which will gobble newlines
53% that are needed for buffers. See blocks-002.tex as example.
54
55% maybe: systemmode "block:<name>"
56
57\let\m_block   \empty
58\let\m_subblock\empty
59
60\unexpanded\def\strc_blocks_begin#1%
61  {\edef\m_block   {#1}%
62   \let \m_subblock\empty
63   \doifelsenextoptionalcs\strc_blocks_begin_yes\strc_blocks_begin_nop}
64
65\unexpanded\def\strc_blocks_begin_yes[#1]%
66  {\doifelseassignmentcs{#1}%
67     \strc_blocks_begin_indeed
68     \strc_blocks_begin_tagged
69     {#1}}
70
71\unexpanded\def\strc_blocks_begin_tagged#1%
72  {\edef\m_subblock{#1}%
73   \doifelsenextoptionalcs\strc_blocks_begin_yes_yes\strc_blocks_begin_nop}
74
75\unexpanded\def\strc_blocks_begin_yes_yes[#1]%
76  {\strc_blocks_begin_indeed{#1}}
77
78\unexpanded\def\strc_blocks_begin_nop
79  {\strc_blocks_begin_indeed{}}
80
81\unexpanded\def\strc_blocks_begin_indeed#1%
82  {\normalexpanded{\buff_pickup{\??block}{\e!begin\m_block}{\e!end\m_block}}%
83     {}%
84     {\clf_savestructureblock{\m_block}{\m_subblock}{#1}{\??block}}%
85     \plusone}
86
87\let\strc_blocks_setup\relax
88
89\newconstant   \c_strc_blocks_index
90\newconditional\c_strc_blocks_display
91
92\unexpanded\def\dostarthiddenblock % called at lua end
93  {\begingroup
94   \visiblefalse % blocks float
95   \startnointerference
96   \strc_start_block}
97
98\unexpanded\def\dostophiddenblock % called at lua end
99  {\strc_stop_block
100   \stopnointerference
101   \endgroup}
102
103\unexpanded\def\dostartnormalblock % called at lua end
104  {\begingroup
105   \visibletrue
106   \strc_start_block}
107
108\unexpanded\def\dostopnormalblock % called at lua end
109  {\strc_stop_block
110   \endgroup}
111
112\def\strc_start_block#1#2%
113  {\edef\currentblock{#2}%
114   \c_strc_blocks_index#1\relax
115   \strc_blocks_setup
116   \let\strc_blocks_setup\relax
117   \edef\p_alternative{\blockparameter\c!alternative}%
118   \ifx\p_alternative\v!text
119      \setfalse\c_strc_blocks_display
120   \else
121      \settrue\c_strc_blocks_display
122   \fi
123   \ifconditional\c_strc_blocks_display
124      \blockparameter\c!before
125   \fi
126   \begingroup
127   \usesetupsparameter\blockparameter\relax
128   \dostarttagged\t!block\currentblock
129   \useblockstyleandcolor\c!style\c!color
130   \blockparameter\c!inner % old
131   \ifconditional\c_strc_blocks_display
132     \usealignparameter\blockparameter
133   \else
134     \blockparameter\c!left
135   \fi
136   \ignorespaces}
137
138\def\strc_stop_block
139  {\removeunwantedspaces
140   \ifconditional\c_strc_blocks_display
141     \par
142   \else
143     \blockparameter\c!right
144   \fi
145   \dostoptagged
146   \endgroup
147   \ifconditional\c_strc_blocks_display
148     \blockparameter\c!after
149   \fi}
150
151\def\strc_blocks_set_state[#1][#2][#3]% state name tag
152  {\clf_setstructureblockstate{#1}{#2}{#3}}
153
154\def\strc_blocks_select[#1][#2][#3][#4]% state name tag setups
155  {\begingroup
156   \doifelseassignment{#3}
157     {\getparameters[\??blocktemp][\c!criterium=\v!text,#3]%
158      \def\strc_blocks_setup{\setupcurrentblock[#3]}%
159      \clf_selectstructureblock{#1}{#2}{}{\csname\??blocktemp\c!criterium\endcsname}}
160     {\getparameters[\??blocktemp][\c!criterium=\v!text,#4]%
161      \def\strc_blocks_setup{\setupcurrentblock[#4]}%
162      \clf_selectstructureblock{#1}{#2}{#3}{\csname\??blocktemp\c!criterium\endcsname}}%
163   \endgroup}
164
165\def\blockuservariable#1%
166  {\clf_structureblockuservariable\c_strc_blocks_index{#1}}
167
168% hide   : save, if [+] also hidden execute
169% keep   : save and normal execute
170% use    : normal execute unless [-]
171% process: hidden execute unless [-]
172% select : idem use
173
174\unexpanded\def\hideblocks   {\dotripleempty   \strc_blocks_set_state[hide]}
175\unexpanded\def\keepblocks   {\dotripleempty   \strc_blocks_set_state[keep]}
176\unexpanded\def\useblocks    {\doquadrupleempty\strc_blocks_select   [use]}
177\unexpanded\def\processblocks{\doquadrupleempty\strc_blocks_select   [process]}
178\unexpanded\def\selectblocks {\doquadrupleempty\strc_blocks_select   [use]}
179
180\unexpanded\def\doifelseblocksempty{\clf_doifelsestructureblocksempty} % {name}{tag}{criterium}
181
182\protect \endinput
183