/* markdown_peg.h */
 
extern char *strdup(const char *string);
 
/**********************************************************************
 
  Data Structures
 
 ***********************************************************************/
 
/* Information (label, URL and title) for a link. */
struct Link {
    struct ElementListItem   *label;
    char                     *url;
    char                     *title;    
};
 
typedef struct Link link;
 
/* Union for contents of an Element (string, list, or link). */
union Contents {
    char                   *str;
    struct ElementListItem *list;
    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. */
            SPACE,
            LINEBREAK,
            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
          };
 
/* Semantic value of a parsing action. */
struct Element {
    int            key;
    union Contents contents;
};
 
typedef struct Element element;
 
/* Node in linked list of Elements. */
struct ElementListItem {
    element                 val;
    struct ElementListItem  *next;    
};
 
typedef struct ElementListItem item;
 
enum markdown_extensions { 
    EXT_SMART_QUOTES     = 1,
    EXT_SMART_DASHES     = 2
};  
 
element markdown(int extensions, char *string);