Fossil

** using an external renderer.
*/

#include "config.h"
#include "markdown.h"

#include <assert.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>

#define MKD_LI_END 8  /* internal list flag */

/********************
 * TYPE DEFINITIONS *
 ********************/

#if INTERFACE

/* mkd_autolink -- type of autolink */
enum mkd_autolink {
  MKDA_NOT_AUTOLINK,    /* used internally when it is not an autolink*/
  MKDA_NORMAL,          /* normal http/http/ftp link */
  MKDA_EXPLICIT_EMAIL,  /* e-mail link with explicit mailto: */
  MKDA_IMPLICIT_EMAIL   /* e-mail link without mailto: */
};

/* mkd_tagspan -- type of tagged <span> */
enum mkd_tagspan {
  MKDT_ATREF,           /* @name references, as in /chat attention targeting */
  MKDT_HASH,            /* #hash tags, message IDs, etc. */
};

/* mkd_renderer -- functions for rendering parsed data */
struct mkd_renderer {
  /* document level callbacks */
  void (*prolog)(struct Blob *ob, void *opaque);
  void (*epilog)(struct Blob *ob, void *opaque);

  int (*emphasis)(struct Blob *ob, struct Blob *text, char c,void*opaque);
  int (*image)(struct Blob *ob, struct Blob *link, struct Blob *title,
            struct Blob *alt, void *opaque);
  int (*linebreak)(struct Blob *ob, void *opaque);
  int (*link)(struct Blob *ob, struct Blob *link, struct Blob *title,
          struct Blob *content, void *opaque);
  int (*raw_html_tag)(struct Blob *ob, struct Blob *tag, void *opaque);
  int (*tagspan)(struct Blob *ob, struct Blob *ref, enum mkd_tagspan type,
        void *opaque);
  int (*triple_emphasis)(struct Blob *ob, struct Blob *text,
            char c, void *opaque);

  /* low level callbacks - NULL copies input directly into the output */
  void (*entity)(struct Blob *ob, struct Blob *entity, void *opaque);
  void (*normal_text)(struct Blob *ob, struct Blob *text, void *opaque);

    rndr->make.entity(ob, &work, rndr->make.opaque);
  }else{
    blob_append(ob, data, end);
  }
  return end;
}


/* char_atref_tag -- '@' followed by "word" characters to tag
 * at-references */
static size_t char_atref_tag(
  struct Blob *ob,
  struct render *rndr,
  char *data,
  size_t offset,
  size_t size
){
  size_t end;
  struct Blob work = BLOB_INITIALIZER;

  if (size < 2 || !isalpha(data[1])) return 0;
  for (end = 2; (end < size) && isalnum(data[end]); ++end) /* */ ;
    
  blob_init(&work, data + 1, end - 1);
  rndr->make.tagspan(ob, &work, MKDT_ATREF, rndr->make.opaque);
  return end;
}


/* char_hashref_tag -- '#' followed by "word" characters to tag
 * post numbers, hashtags, etc. */
static size_t char_hashref_tag(
  struct Blob *ob,
  struct render *rndr,
  char *data,
  size_t offset,
  size_t size
){
  size_t end;
  struct Blob work = BLOB_INITIALIZER;

  if (size < 2 || !isalnum(data[1])) return 0;
  for (end = 2; (end < size) && (isalnum(data[end] || data[end] == '.')); ++end) /* */ ;
    
  blob_init(&work, data + 1, end - 1);
  rndr->make.tagspan(ob, &work, MKDT_HASH, rndr->make.opaque);
  return end;
}


/* char_langle_tag -- '<' when tags or autolinks are allowed */
static size_t char_langle_tag(
  struct Blob *ob,
  struct render *rndr,
  char *data,
  size_t offset,

    for(i=0; rndr.make.emph_chars[i]; i++){
      rndr.active_char[(unsigned char)rndr.make.emph_chars[i]] = char_emphasis;
    }
  }
  if( rndr.make.codespan ) rndr.active_char['`'] = char_codespan;
  if( rndr.make.linebreak ) rndr.active_char['\n'] = char_linebreak;
  if( rndr.make.image || rndr.make.link ) rndr.active_char['['] = char_link;
  rndr.active_char['@'] = char_atref_tag;
  rndr.active_char['#'] = char_hashref_tag;
  rndr.active_char['<'] = char_langle_tag;
  rndr.active_char['\\'] = char_escape;
  rndr.active_char['&'] = char_entity;

  /* first pass: looking for references, copying everything else */
  beg = 0;
  ib_data = blob_buffer(ib);