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      1 /*	Id: eqn.h,v 1.1 2018/12/13 05:23:38 schwarze Exp  */
      2 /*
      3  * Copyright (c) 2011, 2014 Kristaps Dzonsons <kristaps (at) 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