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/* $Id: eqn_parse.h,v 1.4 2022/04/13 20:26:19 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 *);
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