73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
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/* $Id: eqn.h,v 1.1 2018/12/13 05:23:38 schwarze Exp $ */
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/*
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* Copyright (c) 2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Public data types for eqn(7) syntax trees.
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*/
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enum eqn_boxt {
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EQN_TEXT, /* Text, e.g. number, variable, operator, ... */
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EQN_SUBEXPR, /* Nested eqn(7) subexpression. */
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EQN_LIST, /* List, for example in braces. */
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EQN_PILE, /* Vertical pile. */
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EQN_MATRIX /* List of columns. */
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};
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enum eqn_fontt {
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EQNFONT_NONE = 0,
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EQNFONT_ROMAN,
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EQNFONT_BOLD,
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EQNFONT_FAT,
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EQNFONT_ITALIC,
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EQNFONT__MAX
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};
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enum eqn_post {
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EQNPOS_NONE = 0,
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EQNPOS_SUP,
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EQNPOS_SUBSUP,
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EQNPOS_SUB,
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EQNPOS_TO,
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EQNPOS_FROM,
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EQNPOS_FROMTO,
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EQNPOS_OVER,
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EQNPOS_SQRT,
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EQNPOS__MAX
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};
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/*
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* A "box" is a parsed mathematical expression as defined by the eqn.7
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* grammar.
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*/
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struct eqn_box {
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struct eqn_box *parent;
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struct eqn_box *prev;
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struct eqn_box *next;
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struct eqn_box *first; /* First child node. */
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struct eqn_box *last; /* Last child node. */
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char *text; /* Text (or NULL). */
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char *left; /* Left-hand fence. */
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char *right; /* Right-hand fence. */
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char *top; /* Symbol above. */
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char *bottom; /* Symbol below. */
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size_t expectargs; /* Maximal number of arguments. */
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size_t args; /* Actual number of arguments. */
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int size; /* Font size. */
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#define EQN_DEFSIZE INT_MIN
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enum eqn_boxt type; /* Type of node. */
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enum eqn_fontt font; /* Font in this box. */
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enum eqn_post pos; /* Position of the next box. */
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};
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