keys_generator.cpp

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/*
 *
 *
 * Distributed under the OpenDDS License.
 * See: http://www.opendds.org/license.html
 */

#include "keys_generator.h"
#include "be_extern.h"

#include "utl_identifier.h"

#include <string>
using std::string;

bool keys_generator::gen_struct(AST_Structure*, UTL_ScopedName* name,
  const std::vector<AST_Field*>&, AST_Type::SIZE_TYPE, const char*)
{
  string cxx = scoped(name), under = scoped_helper(name, "_");
  IDL_GlobalData::DCPS_Data_Type_Info* info = idl_global->is_dcps_type(name);
  if (!info) {
    return true;
  }

  const bool empty = info->key_list_.is_empty();
  {
    NamespaceGuard ng;
    Function has_key("gen_has_key", "bool");
    has_key.addArg("", "const " + cxx + "&");
    has_key.endArgs();
    be_global->impl_ << "  return " << (empty ? "false" : "true") << ";\n";
  }

  struct Namespaces {
    size_t n_;
    Namespaces(UTL_ScopedName* name)
      : n_(0)
    {
      for (UTL_ScopedName* sn = name; sn && sn->tail();
          sn = static_cast<UTL_ScopedName*>(sn->tail())) {
        string str = sn->head()->get_string();
        if (str.size()) {
          be_global->header_ << "namespace " << str << " {\n";
          ++n_;
        }
      }
    }
    ~Namespaces()
    {
      for (size_t i = 0; i < n_; ++i) be_global->header_ << "}\n";
    }
  } ns(name);

  be_global->header_ <<
    "namespace OpenDDSGenerated {\n"
    "// This structure supports use of std::map with a key\n"
    "// defined by one or more #pragma DCPS_DATA_KEY lines.\n"
    "struct " << be_global->export_macro() << ' ' <<
    name->last_component()->get_string() << "_KeyLessThan {\n"
    "  bool operator()(const " << cxx << "& v1, const " << cxx
    << "& v2) const\n"
    "  {\n"
    "    using ::operator<; // TAO::String_Manager's operator< is "
    "in global NS\n";

  if (empty) {
    be_global->header_ <<
      "    ACE_UNUSED_ARG(v1);\n"
      "    ACE_UNUSED_ARG(v2);\n"
      "    // with no DCPS_DATA_KEYs, return false\n"
      "    // to allow use of map with just one entry\n"
      "    return false;\n"
      "  }\n"
      "};\n"
      "}\n";
    return true;
  }

  IDL_GlobalData::DCPS_Data_Type_Info_Iter iter(info->key_list_);

  for (ACE_TString* kp = 0; iter.next(kp) != 0; iter.advance()) {
    string fname = ACE_TEXT_ALWAYS_CHAR(kp->c_str());
    be_global->header_ <<
      "    if (v1." << fname << " < v2." << fname << ") return true;\n"
      "    if (v2." << fname << " < v1." << fname << ") return false;\n";
  }
  be_global->header_ <<
    "    return false;\n"
    "  }\n};\n}\n";
  return true;
}

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