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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. */
+};