1 /*        Id: eqn.h,v 1.1 2018/12/13 05:23:38 schwarze Exp  */
2 /*
3  * Copyright (c) 2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  *
17  * Public data types for eqn(7) syntax trees.
18  */
19 
20 enum      eqn_boxt {
21           EQN_TEXT, /* Text, e.g. number, variable, operator, ... */
22           EQN_SUBEXPR,        /* Nested eqn(7) subexpression. */
23           EQN_LIST, /* List, for example in braces. */
24           EQN_PILE, /* Vertical pile. */
25           EQN_MATRIX          /* List of columns. */
26 };
27 
28 enum      eqn_fontt {
29           EQNFONT_NONE = 0,
30           EQNFONT_ROMAN,
31           EQNFONT_BOLD,
32           EQNFONT_FAT,
33           EQNFONT_ITALIC,
34           EQNFONT__MAX
35 };
36 
37 enum      eqn_post {
38           EQNPOS_NONE = 0,
39           EQNPOS_SUP,
40           EQNPOS_SUBSUP,
41           EQNPOS_SUB,
42           EQNPOS_TO,
43           EQNPOS_FROM,
44           EQNPOS_FROMTO,
45           EQNPOS_OVER,
46           EQNPOS_SQRT,
47           EQNPOS__MAX
48 };
49 
50  /*
51  * A "box" is a parsed mathematical expression as defined by the eqn.7
52  * grammar.
53  */
54 struct    eqn_box {
55           struct eqn_box       *parent;
56           struct eqn_box       *prev;
57           struct eqn_box       *next;
58           struct eqn_box       *first;   /* First child node. */
59           struct eqn_box       *last;    /* Last child node. */
60           char                 *text;    /* Text (or NULL). */
61           char                 *left;    /* Left-hand fence. */
62           char                 *right;   /* Right-hand fence. */
63           char                 *top;     /* Symbol above. */
64           char                 *bottom;  /* Symbol below. */
65           size_t                expectargs; /* Maximal number of arguments. */
66           size_t                args;    /* Actual number of arguments. */
67           int                   size;    /* Font size. */
68 #define   EQN_DEFSIZE           INT_MIN
69           enum eqn_boxt         type;    /* Type of node. */
70           enum eqn_fontt        font;    /* Font in this box. */
71           enum eqn_post         pos;     /* Position of the next box. */
72 };
73