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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 
//! 
//! $Id$ 
 
#define RXML_CONTEXT (_cur_rxml_context->get()) 
 
constant is_RXML_encodable = 1; 
 
#ifdef RXML_ENCODE_DEBUG 
string _sprintf() {return "RXML.utils.pmod";} 
#endif 
 
constant short_format_length = 40; 
 
// Tell Pike.count_memory this is global. 
constant pike_cycle_depth = 0; 
 
final string format_short (mixed val, void|int length) 
// This one belongs somewhere else.. 
{ 
  string res = ""; 
  if (!length) length = short_format_length; 
 
  void format_val (mixed val) 
  { 
    if (arrayp (val) || multisetp (val)) { 
      string end; 
      if (multisetp (val)) res += "(<", end = ">)", val = indices (val); 
      else res += "({", end = "})"; 
      if (sizeof (res) >= length) throw (0); 
      for (int i = 0; i < sizeof (val);) { 
        format_val (val[i]); 
        if (++i < sizeof (val)) res += ", "; 
        if (sizeof (res) >= length) throw (0); 
      } 
      res += end; 
    } 
    else if (mappingp (val)) { 
      res += "(["; 
      if (sizeof (res) >= length) throw (0); 
      array ind = indices (val); 
      catch (ind = sort (ind));     // sort might fail if there are objects without `< or `>. 
      for (int i = 0; i < sizeof (ind);) { 
        format_val (ind[i]); 
        res += ": "; 
        if (sizeof (res) >= length) throw (0); 
        format_val (val[ind[i]]); 
        if (++i < sizeof (ind)) res += ", "; 
        if (sizeof (res) >= length) throw (0); 
      } 
      res += "])"; 
    } 
    else if (stringp (val)) { 
      if (sizeof (val) > length - sizeof (res)) { 
        sscanf (val, "%[ \t\n\r]", string lead); 
        if (sizeof (lead) > sizeof ("/.../") && sizeof (lead) < sizeof (val)) 
          val = val[sizeof (lead)..], res += "/.../"; 
        if (sizeof (val) > length - sizeof (res)) { 
          res += sprintf ("%q", val[..length - sizeof (res) - 1]); 
          throw (0); 
        } 
      } 
      res += sprintf ("%q", val); 
    } 
    else 
      res += sprintf ("%O", val); 
  }; 
 
  mixed err = catch { 
    format_val (val); 
    return res; 
  }; 
  if (err) throw (err); 
  return res + "/.../"; 
} 
 
final array return_zero (mixed... ignored) {return 0;} 
final array return_empty_array (mixed... ignored) {return ({});} 
final mapping(string:string) return_empty_mapping (mixed... ignored) 
  {return ([]);} 
final mapping(string:string) return_help_arg (mixed... ignored) 
  {return (["help": "help"]);} 
 
protected string type_attribute_hint (RXML.Type type) 
{ 
  // If this happens for t_any inside a <set> or <append> without any 
  // type attribute, it's probably the common pitfall with the default 
  // type for those tags. 
  if (type == RXML.t_any) 
    if (RXML.Context ctx = RXML_CONTEXT) 
      if (ctx->frame && (<"set", "append">)[ctx->frame->tag->name] && 
          zero_type (ctx->frame->args->type)) 
        return "Maybe an attribute type=\"text/*\" is missing.\n"; 
  return ""; 
} 
 
final mixed get_non_nil (RXML.Type type, mixed... vals) 
// Returns the single argument in vals that isn't RXML.nil, or 
// RXML.nil if all of them are that value. Throws an rxml parse error 
// if more than one argument isn't nil. 
{ 
  int pos = -1; 
  do 
    if (++pos == sizeof (vals)) return RXML.nil; 
  while (vals[pos] == RXML.nil); 
  mixed res = vals[pos]; 
  for (pos++; pos < sizeof (vals); pos++) 
    if (vals[pos] != RXML.nil) 
      RXML.parse_error ( 
        "Cannot append another value %s to non-sequential " 
        "value of type %s.\n%s", 
        format_short (vals[pos]), type->name, type_attribute_hint (type)); 
  return res; 
} 
 
final int(1..1)|string|array unknown_tag_error (object/*(RMXL.PXml)*/ p, string str) 
{ 
  p->context->handle_exception ( 
    catch (RXML.parse_error ( 
             "Unknown tag %s is not allowed in context of type %s.\n%s", 
             format_short (p->tag_name()), p->type->name, 
             type_attribute_hint (p->type))), 
    p, p->p_code); 
  return ({}); 
} 
 
final int(1..1)|string|array unknown_pi_tag_error (object/*(RMXL.PXml)*/ p, string str) 
{ 
  sscanf (str, "%[^ \t\n\r]", str); 
  p->context->handle_exception ( 
    catch (RXML.parse_error ( 
             "Unknown processing instruction %s not allowed " 
             "in context of type %s.\n%s", 
             format_short ("<" + p->tag_name() + str), p->type->name, 
             type_attribute_hint (p->type))), 
    p, p->p_code); 
  return ({}); 
} 
 
final int(1..1)|string|array invalid_cdata_error (object/*(RXML.PXml)*/ p, string str) 
{ 
  p->context->handle_exception ( 
    catch (RXML.parse_error ( 
             "CDATA text %O is not allowed in context of type %s.\n%s", 
             format_short (str), p->type->name, 
             type_attribute_hint (p->type))), 
    p, p->p_code); 
  return ({}); 
} 
 
final int(1..1)|string|array output_error_cb (object/*(RMXL.PXml)*/ p, string str) 
{ 
  p->output_errors(); 
  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. 
{ 
  p->drain_output(); 
  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]) 
      p->context->handle_exception ( 
        catch (RXML.parse_error ( 
                 "Sorry, can't handle containers beginning with %s.\n", 
                 p->tag_name())), 
        p, p->p_code); 
  } 
  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)) 
    switch(entity[0]) { 
    case ':': return ({"&", entity[1..], ";"}); 
    case '#': 
      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. 
      } 
      break; 
    default: 
      if (has_value (entity, ".")) { 
        p->drain_output(); 
        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_any_text : type); 
        if (value != RXML.nil && value != RXML.empty) p->add_value (value); 
        return ({}); 
      } 
    } 
  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] == ':') return ({"&", entity[1..], ";"}); 
    else if (has_value (entity, ".")) { 
      p->drain_output(); 
      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_any_text : type); 
      if (value != RXML.nil && value != RXML.empty) p->add_value (value); 
      return ({}); 
    } 
  return ({str}); 
}