/* markdown_peg.h */
 
extern char *strdup(const char *string);
 
/**********************************************************************
 
  Data Structures
 
 ***********************************************************************/
 
/* Information (label, URL and title) for a link. */
struct Link {
    struct Element   *label;
    char             *url;
    char             *title;    
};
 
typedef struct Link link;
 
/* Union for contents of an Element (string, list, or link). */
union Contents {
    char             *str;
    struct Link      link;
};
 
/* Types of semantic values returned by parsers. */ 
enum keys { LIST,   /* A generic list of values.  For ordered and bullet lists, see below. */
            RAW,    /* Raw markdown to be processed further */
            SPACE,
            LINEBREAK,
            ELLIPSIS,
            EMDASH,
            ENDASH,
            APOSTROPHE,
            SINGLEQUOTED,
            DOUBLEQUOTED,
            STR,
            LINK,
            IMAGE,
            CODE,
            HTML,
            EMPH,
            STRONG,
            PLAIN,
            PARA,
            LISTITEM,
            BULLETLIST,
            ORDEREDLIST,
            H1, H2, H3, H4, H5, H6,  /* Code assumes that these are in order. */
            BLOCKQUOTE,
            VERBATIM,
            HTMLBLOCK,
            HRULE,
            REFERENCE,
            NOTE,
          };
 
/* Semantic value of a parsing action. */
struct Element {
    int               key;
    union Contents    contents;
    struct Element    *children;
    struct Element    *next;
};
 
typedef struct Element element;
 
enum markdown_extensions { 
    EXT_SMART            = 1,
    EXT_NOTES            = 2
};  
 
element *cons(element new, element *list);
element *reverse(element *list);
element markdown(char *string, int extensions);
 
/* Output formats. */
enum formats { HTML_FORMAT,
               LATEX_FORMAT,
               GROFF_MM_FORMAT
             };
 
void print_element(element elt, int format);