/*      Id: eqn_parse.h,v 1.3 2018/12/14 06:33:14 schwarze Exp  */
/*
* Copyright (c) 2011 Kristaps Dzonsons <[email protected]>
* Copyright (c) 2014, 2017, 2018 Ingo Schwarze <[email protected]>
*
* 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               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 *);