/* $OpenBSD: eqn_parse.h,v 1.4 2022/04/13 20:19:18 schwarze Exp $ */
/*
 * Copyright (c) 2014, 2017, 2018, 2022 Ingo Schwarze <schwarze@openbsd.org>
 * Copyright (c) 2011 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.
 *
 * External interface of the eqn(7) parser.
 * For use in the roff(7) and eqn(7) parsers only.
 */

struct roff_node;
struct eqn_box;
struct eqn_def;

struct  eqn_node {
        struct roff_node *node;    /* Syntax tree of this equation. */
        struct eqn_def   *defs;    /* Array of definitions. */
        char             *data;    /* Source code of this equation. */
        char             *start;   /* First byte of the current token. */
        char             *end;     /* First byte of the next token. */
        size_t            defsz;   /* Number of definitions. */
        size_t            sz;      /* Length of the source code. */
        size_t            toksz;   /* Length of the current token. */
        int               sublen;  /* End of rightmost substitution, so far. */
        int               subcnt;  /* Number of recursive substitutions. */
        int               gsize;   /* Default point size. */
        int               delim;   /* In-line delimiters enabled. */
        char              odelim;  /* In-line opening delimiter. */
        char              cdelim;  /* In-line closing delimiter. */
};


struct eqn_node *eqn_alloc(void);
struct eqn_box  *eqn_box_new(void);
void             eqn_box_free(struct eqn_box *);
void             eqn_free(struct eqn_node *);
void             eqn_parse(struct eqn_node *);
void             eqn_read(struct eqn_node *, const char *);
void             eqn_reset(struct eqn_node *);