Fossil

** Allowed wiki transformation operations
*/
#define WIKI_NOFOLLOW       0x001
#define WIKI_HTML           0x002
#define WIKI_INLINE         0x004  /* Do not surround with <p>..</p> */
#define WIKI_NOBLOCK        0x008  /* No block markup of any kind */
#define WIKI_BUTTONS        0x010  /* Allow sub-menu buttons */
#define WIKI_NOBADLINKS     0x020  /* Ignore broken hyperlinks */
#define WIKI_DECORATEONLY   0x040  /* No markup.  Only decorate links */
#endif


/*
** These are the only markup attributes allowed.
*/
#define ATTR_ALIGN              1

/*
** Current state of the rendering engine
*/
typedef struct Renderer Renderer;
struct Renderer {
  Blob *pOut;                 /* Output appended to this blob */
  int state;                  /* Flag that govern rendering */
  unsigned renderFlags;       /* Flags from the client */
  int wikiList;               /* Current wiki list type */
  int inVerbatim;             /* True in <verbatim> mode */
  int preVerbState;           /* Value of state prior to verbatim */
  int wantAutoParagraph;      /* True if a <p> is desired */
  int inAutoParagraph;        /* True if within an automatic paragraph */
  const char *zVerbatimId;    /* The id= attribute of <verbatim> */
  int nStack;                 /* Number of elements on the stack */

    *pClosed = db_column_int(&q, 0);
  }else{
    rc = 0;
  }
  db_reset(&q);
  return rc;
}

/*
** Return a pointer to the name part of zTarget (skipping the "wiki:" prefix
** if there is one) if zTarget is a valid wiki page name.  Return NULL if
** zTarget names a page that does not exist.
*/
static const char *validWikiPageName(const char *zTarget){
  if( strncmp(zTarget, "wiki:", 5)==0
      && wiki_name_is_wellformed((const unsigned char*)zTarget) ){
    return zTarget+5;
  }
  if( strcmp(zTarget, "Sandbox")==0 ) return zTarget;
  if( wiki_name_is_wellformed((const unsigned char *)zTarget)
   && db_exists("SELECT 1 FROM tag WHERE tagname GLOB 'wiki-%q'", zTarget) ){
    return zTarget;
  }
  return 0;
}

/*
** Resolve a hyperlink.  The zTarget argument is the content of the [...]
** in the wiki.  Append to the output string whatever text is appropriate
** for opening the hyperlink.  Write into zClose[0...nClose-1] text that will
** close the markup.
**
** If this routine determines that no hyperlink should be generated, then
** set zClose[0] to 0.
**
** Actually, this routine might or might not append the hyperlink, depending
** on current rendering rules: specifically does the current user have
** "History" permission.
**
**    [http://www.fossil-scm.org/]
**    [https://www.fossil-scm.org/]

  const char *zTarget,    /* Hyperlink target; text within [...] */
  char *zClose,           /* Write hyperlink closing text here */
  int nClose,             /* Bytes available in zClose[] */
  const char *zOrig       /* Complete document text */
){
  const char *zTerm = "</a>";
  assert( nClose>=20 );
  const char *z;

  if( strncmp(zTarget, "http:", 5)==0
   || strncmp(zTarget, "https:", 6)==0
   || strncmp(zTarget, "ftp:", 4)==0
   || strncmp(zTarget, "mailto:", 7)==0
  ){
    blob_appendf(p->pOut, "<a href=\"%s\">", zTarget);

          zTerm = "]</a>";
        }else{
          blob_appendf(p->pOut, "[");
          zTerm = "]";
        }
      }
    }else if( !in_this_repo(zTarget) ){
      if( (p->state & (WIKI_DECORATEONLY|WIKI_NOBADLINKS))!=0 ){
        zTerm = "";
      }else{
        blob_appendf(p->pOut, "<span class=\"brokenlink\">[", zTarget);
        zTerm = "]</span>";
      }
    }else if( g.perm.Hyperlink ){
      blob_appendf(p->pOut, "%z[",href("%R/info/%s", zTarget));
      zTerm = "]</a>";
    }
  }else if( strlen(zTarget)>=10 && fossil_isdigit(zTarget[0]) && zTarget[4]=='-'
            && db_int(0, "SELECT datetime(%Q) NOT NULL", zTarget) ){
    blob_appendf(p->pOut, "<a href=\"%R/timeline?c=%T\">", zTarget);


  }else if( (z = validWikiPageName(zTarget))!=0 ){
    blob_appendf(p->pOut, "<a href=\"%R/wiki?name=%T\">", z);


  }else if( zTarget>=&zOrig[2] && !fossil_isspace(zTarget[-2]) ){
    /* Probably an array subscript in code */
    zTerm = "";
  }else if( (p->state & (WIKI_NOBADLINKS|WIKI_DECORATEONLY))!=0 ){
    zTerm = "";
  }else{
    blob_appendf(p->pOut, "<span class=\"brokenlink\">[%h]", zTarget);
    zTerm = "</span>";
  }
  assert( strlen(zTerm)<nClose );
  sqlite3_snprintf(nClose, zClose, "%s", zTerm);
}

/*
** Check to see if the given parsed markup is the correct

      }
      case TOKEN_LINK: {
        char *zTarget;
        char *zDisplay = 0;
        int i, j;
        int savedState;
        char zClose[20];
        char cS1 = 0;
        int iS1;

        startAutoParagraph(p);
        zTarget = &z[1];
        for(i=1; z[i] && z[i]!=']'; i++){
          if( z[i]=='|' && zDisplay==0 ){
            zDisplay = &z[i+1];
            iS1 = i;
            cS1 = z[i];
            z[i] = 0;
            for(j=i-1; j>0 && fossil_isspace(z[j]); j--){ z[j] = 0; }
          }
        }
        z[i] = 0;
        if( zDisplay==0 ){
          zDisplay = zTarget;
        }else{
          while( fossil_isspace(*zDisplay) ) zDisplay++;
        }
        openHyperlink(p, zTarget, zClose, sizeof(zClose), zOrig);
        if( zClose[0] ){
          savedState = p->state;
          p->state &= ~ALLOW_WIKI;
          p->state |= FONT_MARKUP_ONLY;
          wiki_render(p, zDisplay);
          p->state = savedState;
          blob_append(p->pOut, zClose, -1);
        }else{
          if( cS1 ) z[iS1] = cS1;
          blob_appendf(p->pOut, "[%h]", zTarget);
        }
        break;
      }
      case TOKEN_TEXT: {
        int i;
        for(i=0; i<n && fossil_isspace(z[i]); i++){}
        if( i<n ) startAutoParagraph(p);
        blob_append(p->pOut, z, n);

** into the pOut blob.  The pOut blob should already be
** initialized.  The output is merely appended to pOut.
** If pOut is NULL, then the output is appended to the CGI
** reply.
*/
void wiki_convert(Blob *pIn, Blob *pOut, int flags){
  Renderer renderer;

  /* Never show bad hyperlinks */
  flags |= WIKI_NOBADLINKS;

  memset(&renderer, 0, sizeof(renderer));
  renderer.renderFlags = flags;
  renderer.state = ALLOW_WIKI|AT_NEWLINE|AT_PARAGRAPH|flags;
  if( flags & WIKI_NOBLOCK ){
    renderer.state |= INLINE_MARKUP_ONLY;
  }
  if( flags & WIKI_INLINE ){
    renderer.wantAutoParagraph = 0;
  }else{