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/* $OpenBSD: eqn.h,v 1.1 2018/12/13 05:13:15 schwarze Exp $ */
/*
* Copyright (c) 2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Public data types for eqn(7) syntax trees.
*/
enum eqn_boxt {
EQN_TEXT, /* Text, e.g. number, variable, operator, ... */
EQN_SUBEXPR, /* Nested eqn(7) subexpression. */
EQN_LIST, /* List, for example in braces. */
EQN_PILE, /* Vertical pile. */
EQN_MATRIX /* List of columns. */
};
enum eqn_fontt {
EQNFONT_NONE = 0,
EQNFONT_ROMAN,
EQNFONT_BOLD,
EQNFONT_FAT,
EQNFONT_ITALIC,
EQNFONT__MAX
};
enum eqn_post {
EQNPOS_NONE = 0,
EQNPOS_SUP,
EQNPOS_SUBSUP,
EQNPOS_SUB,
EQNPOS_TO,
EQNPOS_FROM,
EQNPOS_FROMTO,
EQNPOS_OVER,
EQNPOS_SQRT,
EQNPOS__MAX
};
/*
* A "box" is a parsed mathematical expression as defined by the eqn.7
* grammar.
*/
struct eqn_box {
struct eqn_box *parent;
struct eqn_box *prev;
struct eqn_box *next;
struct eqn_box *first; /* First child node. */
struct eqn_box *last; /* Last child node. */
char *text; /* Text (or NULL). */
char *left; /* Left-hand fence. */
char *right; /* Right-hand fence. */
char *top; /* Symbol above. */
char *bottom; /* Symbol below. */
size_t expectargs; /* Maximal number of arguments. */
size_t args; /* Actual number of arguments. */
int size; /* Font size. */
#define EQN_DEFSIZE INT_MIN
enum eqn_boxt type; /* Type of node. */
enum eqn_fontt font; /* Font in this box. */
enum eqn_post pos; /* Position of the next box. */
};
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