/*
* Parameters
*/
#define NSTACK  100     /* html grammar is not recursive, so 30 or so should do */
#define NHBUF   8192    /* Input buffer size */
#define NPEEKC  3       /* Maximum lookahead */
#define NTOKEN  65536   /* Maximum token length */
#define NATTR   512     /* Maximum number of attributes of a tag */
typedef struct Pair Pair;
typedef struct Tag Tag;
typedef struct Stack Stack;
typedef struct Hglob Hglob;
typedef struct Form Form;
typedef struct Entity Entity;
struct Pair{
       char *name;
       char *value;
};
struct Entity{
       char *name;
       Rune value;
};
struct Tag{
       char *name;
       int action;
};
struct Stack{
       int tag;                /* html tag being processed */
       int pre;                /* in preformatted text? */
       int font;               /* typeface */
       int size;               /* point size of text */
       int sub;                /* < 0 superscript, > 0 subscript */
       int margin;             /* left margin position */
       int indent;             /* extra indent at paragraph start */
       int number;             /* paragraph number */
       int ismap;              /* flag of <img> */
       int isscript;           /* inside <script> */
       int strike;             /* flag of <strike> */
       int width;              /* size of image */
       int height;
       char *image;            /* arg of <img> */
       char *link;             /* arg of <a href=...> */
       char *name;             /* arg of <a name=...> */
};

/*
* Globals -- these are packed up into a struct that gets passed around
* so that multiple parsers can run concurrently
*/
struct Hglob{
       char *tp;               /* pointer in text buffer */
       char *name;             /* input file name */
       int hfd;                /* input file descriptor */
       char hbuf[NHBUF];       /* input buffer */
       char *hbufp;            /* next character in buffer */
       char *ehbuf;            /* end of good characters in buffer */
       int heof;               /* end of file flag */
       int peekc[NPEEKC];      /* characters to re-read */
       int npeekc;             /* # of characters to re-read */
       char token[NTOKEN];     /* if token type is TEXT */
       Pair attr[NATTR];       /* tag attribute/value pairs */
       int nsp;                /* # of white-space characters before TEXT token */
       int spacc;              /* place to accumulate more spaces */
                               /* if negative, won't accumulate! */
       int tag;                /* if token type is TAG or END */
       Stack stack[NSTACK];    /* parse stack */
       Stack *state;           /* parse stack pointer */
       int lineno;             /* input line number */
       int linebrk;            /* flag set if we require a line-break in output */
       int para;               /* flag set if we need an indent at the break */
       char *text;             /* text buffer */
       char *etext;            /* end of text buffer */
       Form *form;             /* data for form under construction */
       Www *dst;               /* where the text goes */
};

/*
* Token types
*/
enum{
       TAG=1,
       ENDTAG,
       TEXT,
};

/*
* Magic characters corresponding to
*      literal < followed by / ! or alpha,
*      literal > and
*      end of file
*/
#define STAG    65536
#define ETAG    65537
#define EOF     -1

/*
* fonts
*/
enum{
       ROMAN,
       ITALIC,
       BOLD,
       CWIDTH,
};

/*
* font sizes
*/
enum{
       SMALL,
       NORMAL,
       LARGE,
       ENORMOUS,
};

/*
* length direction
*/
enum{
       HORIZ,
       VERT,
};
int strtolength(Hglob *g, int dir, char *str);

/*
* Token names for the html parser.
* Tag_end corresponds to </end> tags.
* Tag_text tags text not in a tag.
* Those two must follow the others.
*/
enum{
       Tag_comment,

       Tag_a,
       Tag_abbr,
       Tag_acronym,
       Tag_address,
       Tag_applet,
       Tag_audio,
       Tag_b,
       Tag_base,
       Tag_blockquot,
       Tag_body,
       Tag_br,
       Tag_button,
       Tag_center,
       Tag_cite,
       Tag_code,
       Tag_dd,
       Tag_del,
       Tag_div,
       Tag_dfn,
       Tag_dir,
       Tag_dl,
       Tag_dt,
       Tag_em,
       Tag_embed,
       Tag_font,
       Tag_form,
       Tag_frame,      /* rm 5.8.97 */
       Tag_h1,
       Tag_h2,
       Tag_h3,
       Tag_h4,
       Tag_h5,
       Tag_h6,
       Tag_head,
       Tag_hr,
       Tag_html,
       Tag_i,
       Tag_iframe,
       Tag_img,
       Tag_image,
       Tag_input,
       Tag_ins,
       Tag_isindex,
       Tag_kbd,
       Tag_key,
       Tag_li,
       Tag_link,
       Tag_listing,
       Tag_menu,
       Tag_meta,
       Tag_nextid,
       Tag_object,
       Tag_ol,
       Tag_option,
       Tag_p,
       Tag_plaintext,
       Tag_pre,
       Tag_s,
       Tag_samp,
       Tag_script,
       Tag_select,
       Tag_span,
       Tag_strike,
       Tag_strong,
       Tag_style,
       Tag_sub,
       Tag_sup,
       Tag_source,
       Tag_table,      /* rm 3.8.00 */
       Tag_td,
       Tag_th,
       Tag_textarea,
       Tag_title,
       Tag_tr,
       Tag_tt,
       Tag_u,
       Tag_ul,
       Tag_var,
       Tag_video,
       Tag_wbr,
       Tag_xmp,

       Tag_end,        /* also used to indicate unrecognized start tag */
       Tag_text,
};
enum{
       NTAG=Tag_end,
       END=1,  /* tag must have a matching end tag */
       NOEND,  /* tag must not have a matching end tag */
       OPTEND, /* tag may have a matching end tag */
       ERR,            /* tag must not occur */
};
Tag tag[];
void rdform(Hglob *);
void endform(Hglob *);
char *pl_getattr(Pair *, char *);
int pl_hasattr(Pair *, char *);
void pl_htmloutput(Hglob *, int, char *, Field *);

#pragma incomplete Form
#pragma incomplete Field

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