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1%D \module
2%D   [       file=typo-scr,
3%D        version=2012.01.23, % very old ... 1995.10.10 .. moved from core-mis
4%D          title=\CONTEXT\ Typesetting Macros,
5%D       subtitle=Scripts,
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 Typesetting Macros / Scripts}
15
16\unprotect
17
18%D I addition to the commands implemented here, we have alternative commands
19%D \type {shiftup} and \type {shiftdown} that can work across paragraphs.
20
21%D \macros
22%D   {low, high, definelow, definehigh, setuplow, setuphigh}
23%D
24%D Although \TEX\ is pretty well aware of super- and subscripts, its mechanism
25%D is mainly tuned for math mode. The next few commands take care of script
26%D texts both modes.
27%D
28%D \startbuffer
29%D The higher\high{one goes} the lower\low{one drops}, or\lohi{yes}{no}?
30%D \stopbuffer
31%D
32%D \typebuffer
33%D \getbuffer
34%D
35%D Note the different placement of \type {\lohi}, where we need a bit more
36%D space. The implementation looks a bit fuzzy, since some \type {\fontdimen}'s
37%D are involved to determine the optimal placement.
38
39\installcorenamespace {low}
40\installcorenamespace {high}
41
42\installcommandhandler \??low  {low}  \??low
43\installcommandhandler \??high {high} \??high
44
45\setuplow [\c!style=\tx,\c!distance=\zeropoint,\c!down=.48\exheight] % historical
46\setuphigh[\c!style=\tx,\c!distance=\zeropoint,\c!up  =.86\exheight] % values
47
48\appendtoks \setuevalue\currentlow {\typo_scripts_low {\currentlow }}\to \everydefinelow
49\appendtoks \setuevalue\currenthigh{\typo_scripts_high{\currenthigh}}\to \everydefinehigh
50
51\unexpanded\def\typo_scripts_low#1#2%
52  {\dontleavehmode
53   \begingroup
54   \edef\currentlow{#1}%
55   \kern\lowparameter\c!distance\relax
56   \setbox\scratchbox\runninghbox\bgroup
57     \lower\lowparameter\c!down\hbox\bgroup
58       \ifx\fontsize\empty
59         \ifmmode
60           \mr % no color yet
61         \else
62           \uselowstyleandcolor\c!style\c!color
63         \fi
64       \else
65         \uselowstyleandcolor\c!style\c!color
66       \fi
67       \dostarttagged\t!sub\currentlow
68       #2%
69       \dostoptagged
70     \egroup
71   \egroup
72   \ht\scratchbox\strutht
73   \dp\scratchbox\strutdp
74   \box\scratchbox
75   \endgroup}
76
77\unexpanded\def\typo_scripts_high#1#2%
78  {\dontleavehmode
79   \begingroup
80   \edef\currenthigh{#1}%
81   \kern\highparameter\c!distance\relax
82   \setbox\scratchbox\runninghbox\bgroup
83     \raise\highparameter\c!up\hbox\bgroup
84       \ifx\fontsize\empty
85         \ifmmode
86           \mr % no color yet
87         \else
88           \usehighstyleandcolor\c!style\c!color
89         \fi
90       \else
91         \usehighstyleandcolor\c!style\c!color
92       \fi
93       \dostarttagged\t!sup\currenthigh
94       #2%
95       \dostoptagged
96     \egroup
97   \egroup
98   \ht\scratchbox\strutht
99   \dp\scratchbox\strutdp
100   \box\scratchbox
101   \endgroup}
102
103\unexpanded\def\low {\typo_scripts_low \empty}
104\unexpanded\def\high{\typo_scripts_high\empty}
105
106%D \macros
107%D   {lohi, hilo, definelohi, setuplohi}
108%D
109%D You can provide an optional keyword \type {left}, in which case the super and
110%D subscripts will be aligned in a way that permits placement at the left of a word
111%D (which means that it will be right aligned).
112%D
113%D \startbuffer
114%D \lohi {aha} {ah} test \lohi {aha} {ah} test
115%D \lohi [left] {aha} {ah} test \lohi [left] {aha} {ah} test
116%D \lohi {aha} {ah} test \lohi {aha} {ah} test
117%D \lohi [left] {aha} {ah}test \lohi [left] {aha} {ah} test
118%D \stopbuffer
119%D
120%D \typebuffer
121%D \getbuffer
122
123\installcorenamespace {lowhigh}
124
125\installcommandhandler \??lowhigh {lowhigh} \??lowhigh
126
127\setuplowhigh
128  [\c!style=\tx,
129   \c!distance=.1\exheight,  % these are
130   \c!up=.96\exheight,       % historical
131   \c!down=.58\exheight]     % values
132
133\appendtoks
134    \setuevalue\currentlowhigh{\typo_scripts_lowhigh{\currentlowhigh}\typo_scripts_lowhigh_indeed}%
135\to \everydefinelowhigh
136
137\unexpanded\def\typo_scripts_lowhigh#1% #2
138  {\dontleavehmode
139   \runninghbox\bgroup
140   \edef\currentlowhigh{#1}%
141   \dosingleempty}                    % #2
142
143\unexpanded\def\typo_scripts_lowhigh_indeed[#1]#2#3% todo: align .. [#1] is compatible hack
144  {\dostarttagged\t!subsup\currentlowhigh
145   \scratchdimen\lowhighparameter\c!distance\relax
146   \setbox\plusfour\hpack{\typo_scripts_lowhigh_low_high\lower\c!down\t!sub{#2}}%
147   \setbox\plussix \hpack{\typo_scripts_lowhigh_low_high\raise\c!up  \t!sup{#3}}%
148   \edef\p_align{#1}%
149   \ifx\p_align\v!left
150     \ifdim\wd\plusfour<\wd\plussix
151       \setbox\plusfour\hpack to \wd\plussix {\hss\box\plusfour}%
152     \else
153       \setbox\plussix \hpack to \wd\plusfour{\hss\box\plussix }%
154     \fi
155   \fi
156   \ifdim\wd\plusfour<\wd\plussix
157     \wd\plusfour\zeropoint
158     \box\plusfour
159     \box\plussix
160   \else
161     \wd\plussix\zeropoint
162     \box\plussix
163     \box\plusfour
164   \fi
165   \dostoptagged
166   \egroup}
167
168\def\typo_scripts_lowhigh_low_high#1#2#3#4%
169  {\kern\scratchdimen
170   \setbox\scratchbox\hpack\bgroup
171     #1\lowhighparameter#2\hbox\bgroup
172       \ifx\fontsize\empty
173         \ifmmode
174           \mr % no color yet
175         \else
176           \uselowhighstyleandcolor\c!style\c!color
177         \fi
178       \else
179         \uselowhighstyleandcolor\c!style\c!color
180       \fi
181       \dostarttagged#3\empty
182       #4%
183       \dostoptagged
184     \egroup
185   \egroup
186   \ht\scratchbox\strutht
187   \dp\scratchbox\strutdp
188   \box\scratchbox}
189
190\unexpanded\def\typo_scripts_highlow_indeed[#1]#2#3%
191  {\typo_scripts_lowhigh_indeed[#1]{#3}{#2}}
192
193\unexpanded\def\lohi{\typo_scripts_lowhigh\empty\typo_scripts_lowhigh_indeed}
194\unexpanded\def\hilo{\typo_scripts_lowhigh\empty\typo_scripts_highlow_indeed}
195
196%D \macros
197%D   {lowmidhigh, definelowmidhigh, setuplowmidhigh}
198%D
199%D The previous command originally didn't have definers. These were introduced when
200%D the next showed up:
201%D
202%D \startbuffer
203%D \definelow       [MyLow]   [style=\txx]
204%D \definehigh      [MyHigh]  [style=\txx]
205%D \definelowhigh   [MyLoHi]  [style=\txx]
206%D \definelowmidhigh[MyLoMiHi][style=\txx]
207%D
208%D We have
209%D     \ruledhbox{\low         {L}} and \ruledhbox{\MyLow         {L}} and
210%D     \ruledhbox{\high        {H}} and \ruledhbox{\MyHigh        {H}} and
211%D     \ruledhbox{\lohi     {L}{H}} and \ruledhbox{\MyLoHi     {L}{H}} and
212%D     \ruledhbox{\lomihi{L}{M}{H}} and \ruledhbox{\MyLoMiHi{L}{M}{H}}.
213%D \stopbuffer
214%D
215%D \typebuffer \getbuffer
216
217\installcorenamespace {lowmidhigh}
218
219\installcommandhandler \??lowmidhigh {lowmidhigh} \??lowmidhigh
220
221\setuplowmidhigh
222  [\c!style=\tx,
223   \c!up=.8\struthtdp,
224   \c!down=.8\struthtdp]
225
226\appendtoks
227    \setuevalue\currentlowmidhigh{\typo_scripts_lowmidhigh{\currentlowmidhigh}}%
228\to \everydefinelowmidhigh
229
230\unexpanded\def\typo_scripts_lowmidhigh#1#2#3#4%
231  {\dontleavehmode
232   \runninghbox\bgroup
233     \edef\currentlowmidhigh{#1}%
234     \dostarttagged\t!subsup\currentlowmidhigh
235     \uselowmidhighstyleandcolor\c!style\c!color
236     \setstrut
237     \setbox\plustwo \hbox{\strut\dostarttagged\t!sub\empty#2\dostoptagged}%
238     \setbox\plusfour\hbox{\strut\dostarttagged\t!mid\empty#3\dostoptagged}% inefficient
239     \setbox\plussix \hbox{\strut\dostarttagged\t!sup\empty#4\dostoptagged}%
240     \scratchdimen \wd
241        \ifdim\wd\plustwo>\wd\plusfour
242          \ifdim\wd\plustwo>\wd\plussix
243             \plustwo
244          \else
245             \plussix
246          \fi
247        \else
248          \ifdim\wd\plusfour>\wd\plussix
249             \plusfour
250          \else
251             \plussix
252          \fi
253        \fi
254     \relax
255     \setbox\plustwo \hpack to \scratchdimen{\hss\lower\lowmidhighparameter\c!down\box\plustwo \hss}%
256     \setbox\plusfour\hpack to \scratchdimen{\hss                                 \box\plusfour\hss}%
257     \setbox\plussix \hpack to \scratchdimen{\hss\raise\lowmidhighparameter\c!up  \box\plussix \hss}%
258     \wd\plustwo \zeropoint
259     \wd\plusfour\zeropoint
260     \box\plusfour
261     \box\plustwo
262     \box\plussix
263     \dostoptagged
264   \egroup}
265
266\unexpanded\def\lomihi      {\typo_scripts_lowmidhigh\empty}
267\unexpanded\def\himilo#1#2#3{\typo_scripts_lowmidhigh\empty{#3}{#2}{#1}}
268
269\protect \endinput
270