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/* 
 * Implements the generic result module of the SQL-interface 
 * 
 * Henrik Grubbström 1996-01-09 
 */ 
 
#pike __REAL_VERSION__ 
 
//! Base class for results for the SQL-interface. 
//! 
//! Used for return results from SQL.Sql->big_query(). 
 
//! This is the number of the current row. The actual semantics 
//! differs between different databases. 
int index; 
 
//! Create a new Sql.sql_result object 
//! 
//! @param res 
//!   Result to use as base. 
protected void create(mixed res); 
 
protected string _sprintf(int type, mapping|void flags) 
{ 
  int f = num_fields(); 
  catch( int r = num_rows() ); 
  int e = eof(); 
  return type=='O' && 
    sprintf("%O(/* row %d/%s, %d field%s */)", 
            this_program, index, 
            (!r || index==r && !e)?"?":(string)num_rows(), 
            f = num_fields(), f!=1?"s":""); 
} 
 
//! Getter for the actual result object. 
//! 
//! @returns 
//!   Returns the current object. 
//! 
//! @note 
//!   Obsoleted in Pike 8.1 due to the wrapper class no longer 
//!   existing, and this symbol thus essentially being a noop.. 
//! 
//! @deprecated __builtin.Sql.Result. 
__deprecated__ array|this_program `master_res() 
{ 
  return this; 
} 
 
//! Returns the number of rows in the result. 
int num_rows(); 
 
//! Returns the number of fields in the result. 
int num_fields(); 
 
//! Returns non-zero if there are no more rows. 
int eof(); 
 
//! Return information about the available fields. 
array(mapping(string:mixed)) fetch_fields(); 
 
//! Skip past a number of rows. 
//! 
//! @param skip 
//!   Number of rows to skip. 
void seek(int skip) { 
  if(skip<0) 
    error("Cannot seek to negative result indices\n"); 
  while(skip--) { 
    index++; 
    fetch_row(); 
  } 
} 
 
//! Fetch the next row from the result. 
//! 
//! @returns 
//!   Returns an array with one element per field in the same order as 
//!   reported by @[fetch_fields()]. See the @[Sql.Sql] class 
//!   documentation for more details on how different data types are 
//!   represented. 
int|array(string|int|float) fetch_row(); 
 
//! Switch to the next set of results. 
//! 
//! Some databases support returning more than one set of results. 
//! This function terminates the current result and switches to 
//! the next (if any). 
//! 
//! @returns 
//!   Returns the @[sql_result] object if there were more results, 
//!   and @expr{0@} (zero) otherwise. 
//! 
//! @throws 
//!   May throw the same errors as @[Sql.Sql()->big_query()] et al. 
this_program next_result(); 
 
// --- Iterator API 
 
class _get_iterator 
{ 
  protected int|array(string|int) row = fetch_row(); 
  protected int pos = 0; 
 
  int index() 
  { 
    return pos; 
  } 
 
  int|array(string|int) value() 
  { 
    return row; 
  } 
 
  int(0..1) next() 
  { 
    pos++; 
    return !!(row = fetch_row()); 
  } 
 
  this_program `+=(int steps) 
  { 
    if(!steps) return this; 
    if(steps<0) error("Iterator must advance a positive numbe of steps.\n"); 
    if(steps>1) 
    { 
      pos += steps-1; 
      seek(steps-1); 
    } 
    next(); 
    return this; 
  } 
 
  int(0..1) `!() 
  { 
    return eof(); 
  } 
 
  int _sizeof() 
  { 
    return num_fields(); 
  } 
} 
 
protected void encode_json(String.Buffer res, mixed msg) 
{ 
  if (stringp(msg)) { 
    res->add("\"", replace(msg, ([ "\"" : "\\\"", 
                                   "\\" : "\\\\", 
                                   "\n" : "\\n", 
                                   "\b" : "\\b", 
                                   "\f" : "\\f", 
                                   "\r" : "\\r", 
                                   "\t" : "\\t" ])), "\""); 
  } else if (arrayp(msg)) { 
    res->putchar('['); 
    foreach(msg; int i; mixed val) { 
      if (i) res->putchar(','); 
      encode_json(res, val); 
    } 
    res->putchar(']'); 
  } else if (mappingp(msg)) { 
    // NOTE: For reference only, not currently reached. 
    res->putchar('{'); 
    foreach(sort(indices(msg)); int i; string ind) { 
      if (i) res->putchar(','); 
      encode_json(res, ind); 
      res->putchar(':'); 
      encode_json(res, msg[ind]); 
    } 
    res->putchar('}'); 
  } else { 
    res->add((string)msg); 
  } 
} 
 
//! Fetch remaining result as @tt{JSON@}-encoded data. 
string fetch_json_result() 
{ 
  String.Buffer res = String.Buffer(); 
  res->putchar('['); 
  array row; 
  for (int i = 0; row = fetch_row(); i++) { 
    if(i) res->putchar(','); 
    encode_json(res, row); 
  } 
  res->putchar(']'); 
  return string_to_utf8(res->get()); 
}