/*
** Append blob contents to another
*/
#define blob_appendb(dest, src) \
  blob_append((dest), blob_buffer(src), blob_size(src))

/*
** Append a string literal to a blob
** TODO: Consider renaming to blob_appendl()
*/
#define blob_append_literal(blob, literal) \
  blob_append((blob), "" literal, (sizeof literal)-1)
  /*
   * The empty string in the second argument leads to a syntax error
   * when the macro is not used with a string literal. Unfortunately
   * the error is not overly explicit.
   */

/*
** TODO: Suggested for removal because the name seems misleading.
*/
#define blob_append_string blob_append_literal

/*
** Seek whence parameter values
*/
#define BLOB_SEEK_SET 1
#define BLOB_SEEK_CUR 2

#endif /* INTERFACE */

  }
  nUsed = pBlob->nUsed;
  pBlob->nUsed += nData;
  pBlob->aData[pBlob->nUsed] = 0;
  memcpy(&pBlob->aData[nUsed], aData, nData);
}








/*
** Append a single character to the blob.  If pBlob is zero then the
** character is written directly to stdout.
*/
void blob_append_char(Blob *pBlob, char c){
  if( pBlob==0 || pBlob->nUsed+1 >= pBlob->nAlloc ){
    blob_append_full(pBlob, &c, 1);

        j++;
        nDups++;
      }
      if( i+1<j ){
        Blob list = empty_blob;
        blob_reserve(&list, k);
        /* must match _joined_footnote_indicator in html_footnote_item() */
        blob_append_literal(&list, "<ul class='fn-joined'>\n");
        for(k=i; k<j; k++){
          struct footnote *y = fn + k;
          blob_append_literal(&list, "<li>");
          if( blob_size(&y->upc) ){
            blob_appendb(&list, &y->upc);
            blob_reset(&y->upc);
          }
          blob_appendb(&list, &y->text);
          blob_append_literal(&list, "</li>\n");

          /* free memory buffer */
          blob_reset(&y->text);
          if( k!=i ) blob_reset(&y->id);
        }
        blob_append_literal(&list, "</ul>\n");
        x->text = list;
        g.ftntsIssues[2]++;
      }
      i = j;
    }
    if( nDups ){  /* clean rndr.notes.all from invalidated footnotes */
      const int n = rndr.notes.nLbled - nDups;

};


/* INTER_BLOCK -- skip a line between block level elements */
#define INTER_BLOCK(ob) \
  do { if( blob_size(ob)>0 ) blob_append_char(ob, '\n'); } while (0)

/* BLOB_APPEND_LITERAL -- append a string literal to a blob

** TODO: Refactor all invocations to use global macro blob_append_literal()




*/
#define BLOB_APPEND_LITERAL  blob_append_literal

/* BLOB_APPEND_BLOB -- append blob contents to another
** TODO: Refactor all invocations to use global macro blob_appendb()
*/
#define BLOB_APPEND_BLOB(dest, src) blob_appendb((dest), (src))

#ifndef FOOTNOTES_WITHOUT_URI
  #define BLOB_APPEND_URI(dest,ctx) blob_appendb(dest,&((ctx)->reqURI))
#else
  #define BLOB_APPEND_URI(dest,ctx)

){
  const char *z = blob_buffer(upc);
  int i, n = blob_size(upc);
  if( n<3 ) return;
  assert( z[0]=='.' && z[n-1] == ':' );

  if( bHTML ){
    blob_append_literal(ob, "<span class='fn-upc'>"
                            "<span class='fn-upcDot'>.</span>");
  }
  n = 0;
  do{
    z++;
    if( *z!='.' && *z!=':' ){
      assert( fossil_isalnum(*z) || *z=='-' );
      n++;
      continue;
    }
    assert( n );
    if(  bHTML ) blob_append_literal(ob, "<span class='");
    blob_append_literal(ob, "fn-upc-");

    for(i=-n; i<0; i++){
      blob_append_char(ob, fossil_tolower(z[i]) );
    }
    if( bHTML ){
      blob_append_literal(ob, "'>");
      blob_append(ob, z-n, n);
      blob_append_literal(ob, "</span>");
    }else{
      blob_append_char(ob, ' ');
    }
    n = 0;
    if( bHTML ){
      if( *z==':' ){
        blob_append_literal(ob,"<span class='fn-upcColon'>:</span>");
      }else{
        blob_append_literal(ob,"<span class='fn-upcDot'>.</span>");
      }
    }
  }while( *z != ':' );
  if( bHTML ) blob_append_literal(ob,"</span>\n");
}

static int html_footnote_ref(
  struct Blob *ob, const struct Blob *span, const struct Blob *upc,
  int iMark, int locus, void *opaque
){
  const struct MarkdownToHtml* ctx = (struct MarkdownToHtml*)opaque;
  const bitfield64_t l = to_base26(locus-1,0);
  char pos[32];
  memset(pos,0,32);
  assert( locus > 0 );
  /* expect BUGs if the following yields compiler warnings */
  if( iMark > 0 ){      /* a regular reference to a footnote */

    sprintf(pos, "%s-%i-%s", ctx->unique.c, iMark, l.c);
    if(span && blob_size(span)) {
      blob_append_literal(ob,"<span class='");
      append_footnote_upc(ob, upc, 0);
      blob_append_literal(ob,"notescope' id='noteref");
      blob_appendf(ob,"%s'>",pos);
      blob_appendb(ob, span);
      blob_trim(ob);
      blob_append_literal(ob,"<sup class='noteref'><a href='");
      BLOB_APPEND_URI(ob, ctx);
      blob_appendf(ob,"#footnote%s'>%i</a></sup></span>", pos, iMark);
    }else{
      blob_trim(ob);
      blob_append_literal(ob,"<sup class='");
      append_footnote_upc(ob, upc, 0);
      blob_append_literal(ob,"noteref'><a href='");
      BLOB_APPEND_URI(ob, ctx);
      blob_appendf(ob,"#footnote%s' id='noteref%s'>%i</a></sup>",
                      pos,           pos,  iMark);
    }
  }else{              /* misreference */
    assert( iMark == -1 );

    sprintf(pos, "%s-%s", ctx->unique.c, l.c);
    if(span && blob_size(span)) {
      blob_appendf(ob, "<span class='notescope' id='misref%s'>", pos);
      blob_appendb(ob, span);
      blob_trim(ob);
      blob_append_literal(ob, "<sup class='noteref misref'><a href='");
      BLOB_APPEND_URI(ob, ctx);
      blob_appendf(ob, "#misreference%s'>misref</a></sup></span>", pos);
    }else{
      blob_trim(ob);
      blob_append_literal(ob, "<sup class='noteref misref'><a href='");
      BLOB_APPEND_URI(ob, ctx);
      blob_appendf(ob, "#misreference%s' id='misref%s'>", pos, pos);
      blob_append_literal(ob, "misref</a></sup>");
    }
  }
  return 1;
}

/* Render a single item of the footnotes list.
 * Each backref gets a unique id to enable dynamic styling. */
static void html_footnote_item(
  struct Blob *ob, const struct Blob *text, int iMark, int nUsed, void *opaque
){
  const struct MarkdownToHtml* ctx = (struct MarkdownToHtml*)opaque;
  const char * const unique = ctx->unique.c;
  /* make.footnote_item() invocations should pass args accordingly */
  const struct Blob *upc = text+1;
  assert( nUsed >= 0 );
  /* expect BUGs if the following yields compiler warnings */

  if( iMark < 0 ){                     /* misreferences */
    assert( iMark == -1 );
    assert( nUsed );
    blob_append_literal(ob,"<li class='fn-misreference'>"
                              "<sup class='fn-backrefs'>");
    if( nUsed == 1 ){
      blob_appendf(ob,"<a id='misreference%s-a' href='", unique);
      BLOB_APPEND_URI(ob, ctx);
      blob_appendf(ob,"#misref%s-a'>^</a>", unique);
    }else{
      int i;
      blob_append_char(ob, '^');
      for(i=0; i<nUsed && i<26; i++){
        const int c = i + (unsigned)'a';
        blob_appendf(ob," <a id='misreference%s-%c' href='", unique,c);
        BLOB_APPEND_URI(ob, ctx);
        blob_appendf(ob,"#misref%s-%c'>%c</a>", unique,c, c);
      }
      if( i < nUsed ) blob_append_literal(ob," &hellip;");
    }
    blob_append_literal(ob,"</sup>\n<span>Misreference</span>");

  }else if( iMark > 0 ){  /* regular, joined and overnested footnotes */
    char pos[24];
    int bJoin = 0;
    #define _joined_footnote_indicator "<ul class='fn-joined'>"
    #define _jfi_sz (sizeof(_joined_footnote_indicator)-1)
    assert( text );
    assert( blob_size(text) );
    memset(pos,0,24);
    sprintf(pos, "%s-%i", unique, iMark);

    blob_appendf(ob, "<li id='footnote%s' class='", pos);
    if( nUsed ){
      if( blob_size(text)>=_jfi_sz &&
         !memcmp(blob_buffer(text),_joined_footnote_indicator,_jfi_sz)){
        bJoin = 1;
        blob_append_literal(ob, "fn-joined ");
      }
      append_footnote_upc(ob, upc, 0);
    }else{
      blob_append_literal(ob, "fn-toodeep ");
    }

    if( nUsed <= 1 ){
      blob_append_literal(ob, "fn-monoref'><sup class='fn-backrefs'>");
      blob_appendf(ob,"<a id='footnote%s-a' href='", pos);
      BLOB_APPEND_URI(ob, ctx);
      blob_appendf(ob,"#noteref%s-a'>^</a>", pos);
    }else{
      int i;
      blob_append_literal(ob, "fn-polyref'><sup class='fn-backrefs'>^");
      for(i=0; i<nUsed && i<26; i++){
        const int c = i + (unsigned)'a';
        blob_appendf(ob," <a id='footnote%s-%c' href='", pos,c);
        BLOB_APPEND_URI(ob, ctx);
        blob_appendf(ob,"#noteref%s-%c'>%c</a>", pos,c, c);
      }
      /* It's unlikely that so many backrefs will be usefull */
      /* but maybe for some machine generated documents... */
      for(; i<nUsed && i<676; i++){
        const bitfield64_t l = to_base26(i,0);
        blob_appendf(ob," <a id='footnote%s-%s' href='", pos, l.c);
        BLOB_APPEND_URI(ob, ctx);
        blob_appendf(ob,"#noteref%s-%s'>%s</a>", pos,l.c, l.c);
      }
      if( i < nUsed ) blob_append_literal(ob," &hellip;");
    }
    blob_append_literal(ob,"</sup>\n");
    if( bJoin ){
      blob_append_literal(ob,"<sup class='fn-joined'></sup><ul>");
      blob_append(ob,blob_buffer(text)+_jfi_sz,blob_size(text)-_jfi_sz);
    }else if( nUsed ){
      append_footnote_upc(ob, upc, 1);
      blob_appendb(ob, text);
    }else{
      blob_append_literal(ob,"<i></i>\n"
          "<pre><code class='language-markdown'>");
      if( blob_size(upc) ){
        blob_appendb(ob, upc);
      }
      html_escape(ob, blob_buffer(text), blob_size(text));
      blob_append_literal(ob,"</code></pre>");
    }
    #undef _joined_footnote_indicator
    #undef _jfi_sz
  }else{             /* a footnote was defined but wasn't referenced */
    /* make.footnote_item() invocations should pass args accordingly */
    const struct Blob * id = text-1;
    assert( !nUsed );
    assert( text );
    assert( blob_size(text) );
    assert( blob_size(id) );
    blob_append_literal(ob,"<li class='fn-unreferenced'>\n[^&nbsp;<code>");
    html_escape(ob, blob_buffer(id), blob_size(id));
    blob_append_literal(ob, "</code>&nbsp;]<i></i>\n"
        "<pre><code class='language-markdown'>");
    if( blob_size(upc) ){
      blob_appendb(ob, upc);
    }
    html_escape(ob, blob_buffer(text), blob_size(text));
    blob_append_literal(ob,"</code></pre>");
  }
  blob_append_literal(ob, "\n</li>\n");
}
static void html_footnotes(
  struct Blob *ob, const struct Blob *items, void *opaque
){
  if( items && blob_size(items) ){
    blob_append_literal(ob,
      "\n<hr class='footnotes-separator'/>\n<ol class='footnotes'>\n");
    blob_appendb(ob, items);
    blob_append_literal(ob, "</ol>\n");
  }
}

/* HTML span tags */

static int html_raw_html_tag(struct Blob *ob, struct Blob *text, void *opaque){
  blob_append(ob, blob_buffer(text), blob_size(text));