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
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
|
% \iffalse meta-comment
%
%% File: l3intarray.dtx Copyright (C) 2017 The LaTeX3 Project
%
% It may be distributed and/or modified under the conditions of the
% LaTeX Project Public License (LPPL), either version 1.3c of this
% license or (at your option) any later version. The latest version
% of this license is in the file
%
% https://www.latex-project.org/lppl.txt
%
% This file is part of the "l3kernel bundle" (The Work in LPPL)
% and all files in that bundle must be distributed together.
%
% -----------------------------------------------------------------------
%
% The development version of the bundle can be found at
%
% https://github.com/latex3/latex3
%
% for those people who are interested.
%
%<*driver>
\documentclass[full,kernel]{l3doc}
\begin{document}
\DocInput{\jobname.dtx}
\end{document}
%</driver>
% \fi
%
%
% \title{^^A
% The \textsf{l3intarray} package: low-level arrays of small integers^^A
% }
%
% \author{^^A
% The \LaTeX3 Project\thanks
% {^^A
% E-mail:
% \href{mailto:latex-team@latex-project.org}
% {latex-team@latex-project.org}^^A
% }^^A
% }
%
% \date{Released 2017/12/05}
%
% \maketitle
%
% \begin{documentation}
%
% \section{\pkg{l3intarray} documentation}
%
% This module provides no user function: at present it is meant for
% kernel use only.
%
% It is a wrapper around the \tn{fontdimen} primitive, used to store
% arrays of integers (with a restricted range: absolute value at most
% $2^{30}-1$). In contrast to \pkg{l3seq} sequences the access to
% individual entries is done in constant time rather than linear time,
% but only integers can be stored. More precisely, the primitive
% \tn{fontdimen} stores dimensions but the \pkg{l3intarray} package
% transparently converts these from/to integers. Assignments are always
% global.
%
% While \LuaTeX{}'s memory is extensible, other engines can
% \enquote{only} deal with a bit less than $4\times 10^6$ entries in all
% \tn{fontdimen} arrays combined (with default \TeX{}Live settings).
%
% \subsection{Internal functions}
%
% \begin{function}{\__intarray_new:Nn}
% \begin{syntax}
% \cs{__intarray_new:Nn} \meta{intarray~var} \Arg{size}
% \end{syntax}
% Evaluates the integer expression \meta{size} and allocates an
% \meta{integer array variable} with that number of (zero) entries.
% \end{function}
%
% \begin{function}[EXP]{\__intarray_count:N}
% \begin{syntax}
% \cs{__intarray_count:N} \meta{intarray~var}
% \end{syntax}
% Expands to the number of entries in the \meta{integer array variable}.
% Contrarily to \cs{seq_count:N} this is performed in constant time.
% \end{function}
%
% \begin{function}{\__intarray_gset:Nnn, \__intarray_gset_fast:Nnn}
% \begin{syntax}
% \cs{__intarray_gset:Nnn} \meta{intarray~var} \Arg{position} \Arg{value}
% \cs{__intarray_gset_fast:Nnn} \meta{intarray~var} \Arg{position} \Arg{value}
% \end{syntax}
% Stores the result of evaluating the integer expression \meta{value}
% into the \meta{integer array variable} at the (integer expression)
% \meta{position}. While \cs{__intarray_gset:Nnn} checks that the
% \meta{position} is between $1$ and the \cs{__intarray_count:N} and that
% the \meta{value}'s absolute value is at most $2^{30}-1$, the
% \enquote{fast} function performs no such bound check.
% Assignments are always global.
% \end{function}
%
% \begin{function}[EXP]{\__intarray_item:Nn, \__intarray_item_fast:Nn}
% \begin{syntax}
% \cs{__intarray_item:Nn} \meta{intarray~var} \Arg{position}
% \cs{__intarray_item_fast:Nn} \meta{intarray~var} \Arg{position}
% \end{syntax}
% Expands to the integer entry stored at the (integer expression)
% \meta{position} in the \meta{integer array variable}. While
% \cs{__intarray_item:Nn} checks that the \meta{position} is between $1$
% and the \cs{__intarray_count:N}, the \enquote{fast} function performs
% no such bound check.
% \end{function}
%
% \end{documentation}
%
% \begin{implementation}
%
% \section{\pkg{l3intarray} implementation}
%
% \begin{macrocode}
%<*initex|package>
% \end{macrocode}
%
% \begin{macrocode}
%<@@=intarray>
% \end{macrocode}
%
% \subsection{Allocating arrays}
%
% \begin{variable}{\g_@@_font_int}
% Used to assign one font per array.
% \begin{macrocode}
\int_new:N \g_@@_font_int
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\@@_new:Nn}
% Declare |#1| to be a font (arbitrarily |cmr10| at a never-used
% size). Store the array's size as the \tn{hyphenchar} of that font
% and make sure enough \tn{fontdimen} are allocated, by setting the
% last one. Then clear any \tn{fontdimen} that |cmr10| starts with.
% It seems \LuaTeX{}'s |cmr10| has an extra \tn{fontdimen} parameter
% number $8$ compared to other engines (for a math font we would
% replace $8$ by $22$ or some such).
% \begin{macrocode}
\cs_new_protected:Npn \@@_new:Nn #1#2
{
\__chk_if_free_cs:N #1
\int_gincr:N \g_@@_font_int
\tex_global:D \tex_font:D #1 = cmr10~at~ \g_@@_font_int sp \scan_stop:
\tex_hyphenchar:D #1 = \int_eval:n {#2} \scan_stop:
\int_compare:nNnT { \tex_hyphenchar:D #1 } > 0
{ \tex_fontdimen:D \tex_hyphenchar:D #1 #1 = 0 sp \scan_stop: }
\int_step_inline:nnnn { 1 } { 1 } { 8 }
{ \tex_fontdimen:D ##1 #1 = 0 sp \scan_stop: }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[EXP]{\@@_count:N}
% Size of an array.
% \begin{macrocode}
\cs_new:Npn \@@_count:N #1 { \tex_the:D \tex_hyphenchar:D #1 }
% \end{macrocode}
% \end{macro}
%
% \subsection{Array items}
%
% \begin{macro}{\@@_gset:Nnn, \@@_gset_fast:Nnn}
% \begin{macro}{\@@_gset_aux:Nnn}
% Set the appropriate \tn{fontdimen}. The slow version checks the
% position and value are within bounds.
% \begin{macrocode}
\cs_new_protected:Npn \@@_gset_fast:Nnn #1#2#3
{ \tex_fontdimen:D \int_eval:n {#2} #1 = \int_eval:n {#3} sp \scan_stop: }
\cs_new_protected:Npn \@@_gset:Nnn #1#2#3
{
\exp_args:Nff \@@_gset_aux:Nnn #1
{ \int_eval:n {#2} } { \int_eval:n {#3} }
}
\cs_new_protected:Npn \@@_gset_aux:Nnn #1#2#3
{
\int_compare:nTF { 1 <= #2 <= \@@_count:N #1 }
{
\int_compare:nTF { - \c_max_dim <= \int_abs:n {#3} <= \c_max_dim }
{ \@@_gset_fast:Nnn #1 {#2} {#3} }
{
\__msg_kernel_error:nnxxxx { kernel } { overflow }
{ \token_to_str:N #1 } {#2} {#3}
{ \int_compare:nNnT {#3} < 0 { - } \__int_value:w \c_max_dim }
\@@_gset_fast:Nnn #1 {#2}
{ \int_compare:nNnT {#3} < 0 { - } \c_max_dim }
}
}
{
\__msg_kernel_error:nnxxx { kernel } { out-of-bounds }
{ \token_to_str:N #1 } {#2} { \@@_count:N #1 }
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}[EXP]{\@@_item:Nn, \@@_item_fast:Nn}
% \begin{macro}{\@@_item_aux:Nn}
% Get the appropriate \tn{fontdimen} and perform bound checks if requested.
% \begin{macrocode}
\cs_new:Npn \@@_item_fast:Nn #1#2
{ \__int_value:w \tex_fontdimen:D \int_eval:n {#2} #1 }
\cs_new:Npn \@@_item:Nn #1#2
{ \exp_args:Nf \@@_item_aux:Nn #1 { \int_eval:n {#2} } }
\cs_new:Npn \@@_item_aux:Nn #1#2
{
\int_compare:nTF { 1 <= #2 <= \@@_count:N #1 }
{ \@@_item_fast:Nn #1 {#2} }
{
\__msg_kernel_expandable_error:nnnnn { kernel } { out-of-bounds }
{ \token_to_str:N #1 } {#2} { \@@_count:N #1 }
0
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macrocode}
%</initex|package>
% \end{macrocode}
%
% \end{implementation}
%
% \PrintIndex
|
