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//! Things that belong elsewhere but can't lie there for various silly 
//! reasons. Everything here is considered internal and not part of 
//! the RXML.pmod API. 
//! 
//! E.g. one reason is to avoid circular references in the parser 
//! objects when the callbacks are defined in them. 
//! 
//! Created 2000-01-21 by Martin Stjernholm 
//! 
//! $Id: utils.pmod,v 1.20 2001/04/18 04:51:42 mast Exp $ 
 
 
final string format_short (mixed val) 
{ 
  if (stringp (val)) 
    if (sizeof (val) <= 30) 
      return sprintf ("%O", val); 
    else 
      return sprintf ("%O/.../", val[..29]); 
  else { 
    val = sprintf ("%O", val); 
    if (sizeof (val) <= 30) 
      return val; 
    else 
      return val[..29] + "/.../"; 
  } 
} 
 
final array return_zero (mixed... ignored) {return 0;} 
final array return_empty_array (mixed... ignored) {return ({});} 
 
final int(1..1)|string|array free_text_error (object/*(RMXL.PXml)*/ p, string str) 
{ 
  sscanf (str, "%[ \t\n\r]", string ws); 
  if (str != ws) 
    RXML.parse_error ("Free text %s is not allowed in context of type %s.\n", 
                      format_short (String.trim_all_whites (str)), p->type->name); 
  return ({}); 
} 
 
final int(1..1)|string|array unknown_tag_error (object/*(RMXL.PXml)*/ p, string str) 
{ 
  RXML.parse_error ("Unknown tag %s is not allowed in context of type %s.\n", 
                    format_short (p->tag_name()), p->type->name); 
  return ({}); 
} 
 
final int(1..1)|string|array unknown_pi_tag_error (object/*(RMXL.PXml)*/ p, string str) 
{ 
  sscanf (str, "%[^ \t\n\r]", str); 
  RXML.parse_error ( 
    "Unknown processing instruction %s not allowed in context of type %s.\n", 
    format_short ("<" + p->tag_name() + str), p->type->name); 
  return ({}); 
} 
 
final int(1..1)|string|array invalid_cdata_error (object/*(RXML.PXml)*/ p, string str) 
{ 
  RXML.parse_error ("CDATA text %O is not allowed in context of type %s.\n", 
                    format_short (str), p->type->name); 
  return ({}); 
} 
 
final int(1..1)|string|array output_error_cb (object/*(RMXL.PXml)*/ p, string str) 
{ 
  if (p->errmsgs) str = p->errmsgs + str, p->errmsgs = 0; 
  if (p->type->free_text) p->_set_data_callback (0); 
  else p->_set_data_callback (free_text_error); 
  return ({str}); 
} 
 
 
// PXml and PEnt callbacks. 
 
final int(1..1)|string|array p_xml_comment_cb (object/*(RXML.PXml)*/ p, string str) 
// FIXME: This is a kludge until quote tags are handled like other tags. 
{ 
  if (p->type->handle_literals) p->handle_literal(); 
  string name = p->parse_tag_name (str); 
  if (sizeof (name)) { 
    name = p->tag_name() + name; 
    if (string|array|function tdef = p->tags()[name]) { 
      if (stringp (tdef)) 
        return ({tdef}); 
      else if (arrayp (tdef)) 
        return tdef[0] (p, p->parse_tag_args (str), @tdef[1..]); 
      else 
        return tdef (p, p->parse_tag_args (str)); 
    } 
    else if (p->containers()[name]) 
      RXML.parse_error ("Sorry, can't handle containers beginning with " + 
                        p->tag_name() + ".\n"); 
  } 
  return p->type->free_text ? 0 : ({}); 
} 
 
final int(1..1)|string|array p_xml_cdata_cb (object/*(RXML.PXml)*/ p, string str) 
{ 
  return ({str}); 
} 
 
final int(1..1)|string|array p_xml_entity_cb (object/*(RXML.PXml)*/ p, string str) 
{ 
  RXML.Type type = p->type; 
  string entity = p->tag_name(); 
  if (sizeof (entity)) 
    if (entity[0] == '#') { 
      if (!p->type->entity_syntax) { 
        // Don't decode normal entities if we're outputting xml-like stuff. 
        if (sscanf (entity, 
                    (<"#x", "#X">)[entity[..1]] ? "%*2s%x%*c" : "%*c%d%*c", 
                    int char) == 2) 
          catch (str = (string) ({char})); 
        // Lax error handling: Just let it through if it can't be 
        // converted. Not really good, though. 
      } 
    } 
    else 
      if (entity[0] == ':') str = entity[1..]; 
      else if (has_value (entity, ".")) { 
        if (type->handle_literals) p->handle_literal(); 
        mixed value = p->handle_var ( 
          entity, 
          // No quoting of splice args. FIXME: Add some sort of 
          // safeguard against splicing in things like "nice><evil 
          // stuff='...'"? 
          p->html_context() == "splice_arg" ? RXML.t_string : type); 
        if (value != RXML.nil) { 
          if (type->free_text) return ({value}); 
          p->add_value (value); 
        } 
        return ({}); 
      } 
  if (!type->free_text) 
    RXML.parse_error ("Unknown entity \"&%s;\" not allowed context of type %s.\n", 
                      entity, type->name); 
  return ({str}); 
} 
 
final int(1..1)|string|array p_xml_compat_entity_cb (object/*(RMXL.PXml)*/ p, string str) 
{ 
  RXML.Type type = p->type; 
  string entity = p->tag_name(); 
  if (sizeof (entity) && entity[0] != '#') 
    if (entity[0] == ':') str = entity[1..]; 
    else if (has_value (entity, ".")) { 
      if (type->handle_literals) p->handle_literal(); 
      mixed value = p->handle_var ( 
        entity, 
        // No quoting of splice args. FIXME: Add some sort of 
        // safeguard against splicing in things like "nice><evil 
        // stuff='...'"? 
        p->html_context() == "splice_arg" ? RXML.t_string : p->type); 
      if (value != RXML.nil) { 
        if (type->free_text) return ({value}); 
        p->add_value (value); 
      } 
      return ({}); 
    } 
  if (!type->free_text) 
    RXML.parse_error ("Unknown entity \"&%s;\" not allowed in context of type %s.\n", 
                      entity, type->name); 
  return ({str}); 
}