1 files changed, 72 insertions, 0 deletions
diff --git a/usr.bin/mandoc/eqn.h b/usr.bin/mandoc/eqn.h
new file mode 100644
index 00000000000..0eff4a4fb11
--- /dev/null
+++ b/usr.bin/mandoc/eqn.h
@@ -0,0 +1,72 @@
+/*	$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. */
+};