73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
/* $Id: eqn.h,v 1.1 2018/12/13 05:23:38 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. */
|
|
};
|