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
|
%% This is part of the OpTeX project, see http://petr.olsak.net/optex
\_codedecl \newdimen {Allocators for registers <2021-02-15>} % loaded in format
\_doc -----------------------------
The limits are set first.
\_cod -----------------------------
\_chardef\_maicount = 65535 % Max Allocation Index for counts registers in LuaTeX
\_let\_maidimen = \_maicount
\_let\_maiskip = \_maicount
\_let\_maimuskip = \_maicount
\_let\_maibox = \_maicount
\_let\_maitoks = \_maicount
\_chardef\_mairead = 15
\_chardef\_maiwrite = 15
\_chardef\_maifam = 255
\_doc -----------------------------
Each allocation macro needs its own counter.
\_cod -----------------------------
\_countdef\_countalloc=10 \_countalloc=255
\_countdef\_dimenalloc=11 \_dimenalloc=255
\_countdef\_skipalloc=12 \_skipalloc=255
\_countdef\_muskipalloc=13 \_muskipalloc=255
\_countdef\_boxalloc=14 \_boxalloc=255
\_countdef\_toksalloc=15 \_toksalloc=255
\_countdef\_readalloc=16 \_readalloc=-1
\_countdef\_writealloc=17 \_writealloc=-1
\_countdef\_famalloc=18 \_famalloc=3
\_doc -----------------------------
The common allocation macro
\`\_allocator` `\<sequence> {<type>} \<primitive declarator>`
is defined. This idea was used in classical plain \TeX/ by
Donald Knuth too but the macro from plain \TeX/ seems to be
more complicated:).
\_cod -----------------------------
\_def\_allocator #1#2#3{%
\_incr{\_cs{_#2alloc}}%
\_ifnum\_cs{_#2alloc}>\_cs{_mai#2}%
\_errmessage{No room for a new \_ea\_string\_csname #2\_endcsname}%
\_else
\_global#3#1=\_cs{_#2alloc}%
\_wlog{\_string#1=\_ea\_string\_csname #2\_endcsname\_the\_cs{_#2alloc}}%
\_fi
}
\_doc -----------------------------
The allocation macros
\`\newcount`, \`\newdimen`, \`\newskip`, \`\newmuskip`, \`\newbox`,
\`\newtoks`, \`\newread`, \`\newwrite` and \`\newfam`
are defined here.
\_cod -----------------------------
\_def\_newcount #1{\_allocator #1{count}\_countdef}
\_def\_newdimen #1{\_allocator #1{dimen}\_dimendef}
\_def\_newskip #1{\_allocator #1{skip}\_skipdef}
\_def\_newmuskip #1{\_allocator #1{muskip}\_muskipdef}
\_def\_newbox #1{\_allocator #1{box}\_chardef}
\_def\_newtoks #1{\_allocator #1{toks}\_toksdef}
\_def\_newread #1{\_allocator #1{read}\_chardef}
\_def\_newwrite #1{\_allocator #1{write}\_chardef}
\_def\_newfam #1{\_allocator #1{fam}\_chardef}
\_public \newcount \newdimen \newskip \newmuskip \newbox \newtoks \newread \newwrite \newfam ;
\_doc -----------------------------
The \`\newinsert` macro is defined differently than others.
\_cod -----------------------------
\_newcount\_insertalloc \_insertalloc=255
\_chardef\_insertmin = 201
\_def\_newinsert #1{%
\_decr\_insertalloc
\_ifnum\_insertalloc <\_insertmin
\_errmessage {No room for a new \_string\insert}%
\_else
\_global\_chardef#1=\_insertalloc
\_wlog {\_string#1=\_string\_insert\_the\_insertalloc}%
\_fi
}
\_public \newinsert ;
\_doc -----------------------------
Other allocation macros \`\newattribute` and \`\newcatcodetable`
have their counter allocated by the `\newcount` macro.
\_cod -----------------------------
\_newcount \_attributealloc \_attributealloc=0
\_chardef\_maiattribute=\_maicount
\_def\_newattribute #1{\_allocator #1{attribute}\_attributedef}
\_newcount \_catcodetablealloc \_catcodetablealloc=10
\_chardef\_maicatcodetable=32767
\_def\_newcatcodetable #1{\_allocator #1{catcodetable}\_chardef}
\_public \newattribute \newcatcodetable ;
\_doc -----------------------------
We declare public and private versions of `\tmpnum` and `\tmpdim`
registers separately. They are independent registers.
\_cod -----------------------------
\_newcount \tmpnum \_newcount \_tmpnum
\_newdimen \tmpdim \_newdimen \_tmpdim
\_doc -----------------------------
A few registers are initialized like in plain\TeX/. We absolutely
don't support the `@`category dance, so `\z@skip`
`\z@`, `\p@` etc. are not defined in \OpTeX/. If you need such
control sequences then you can initialize them by `\load[plain-at]`.
Only the \`\_zo` and \`\_zoskip` (equivalents to `\z@` and `\z@skip`)
are declared here and used in some internal macros of \OpTeX/
for improving speed.
\_cod -----------------------------
\_newdimen\_maxdimen \_maxdimen=16383.99999pt % the largest legal <dimen>
\_newdimen\_zo \_zo=0pt
\_newskip\_hideskip \_hideskip=-1000pt plus 1fill % negative but can grow
\_newskip\_centering \_centering=0pt plus 1000pt minus 1000pt
\_newskip\_zoskip \_zoskip=0pt plus0pt minus0pt
\_newbox\_voidbox % permanently void box register
\_public \maxdimen \hideskip \centering \voidbox ;
\_endcode %---------------------------------------------------
Like plain\TeX, the allocators `\newcount`, `\newwrite`, etc. are defined.
The registers are allocated from 256 to the `\_mai<type>` which is 65535 in
\LuaTeX/.
Unlike in Plain\TeX/, the mentioned allocators are not `\outer`.
User can use `\dimen0` to `\dimen200` and similarly for `\skip`,
`\muskip`, `\box`, and `\toks` directly. User can use
`\count20` to `\count200` directly too. This is the same
philosophy as in old plain\TeX/, but the range of directly used registers
is wider.
Inserts are allocated from 254 to 201 using `\newinsert`.
You can define your own allocation concept (for example for allocation of
arrays) from the top of the registers array. The example shows a definition of
the array-like declarator of counters.
\nobreak
\begtt
\newcount \_maicount % redefine maximal allocation index as variable
\_maicount = \maicount % first value is top of the array
\def\newcountarray #1[#2]{% \newcountarray \foo[100]
\global\advance\_maicount by -#2\relax
\ifnum \_countalloc > \_maicount
\errmessage{No room for a new array of \string\count}%
\else
\global\chardef#1=\_maicount
\fi
}
\def\usecount #1[#2]{% \usecount \foo[2]
\count\numexpr#1+#2\relax
}
\endtt
\_endinput
2021-02-15 \_advance -> \_incr, \_decr
2020-05-12 \newmath -> \newfam bug fixing
2020-01-23 released
|
