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// file : odb/relational/common.cxx
// author : Boris Kolpackov <boris@codesynthesis.com>
// copyright : Copyright (c) 2009-2011 Code Synthesis Tools CC
// license : GNU GPL v3; see accompanying LICENSE file
#include <string>
#include <cstddef> // std::size_
#include <cstdlib> // abort
#include <sstream>
#include <cxxabi.h> // abi::__cxa_demangle
#include <odb/relational/common.hxx>
using namespace std;
namespace relational
{
// query_columns
//
query_columns::
query_columns ()
: ptr_ (true), decl_ (true)
{
}
query_columns::
query_columns (semantics::class_& c) //@@ context::object
: ptr_ (true), decl_ (false)
{
scope_ = "access::object_traits< " + c.fq_name () + " >::query_columns";
table_ = default_table_ = table_qname (c);
}
void query_columns::
object (semantics::class_& c)
{
// We only want members for objects unless we are traversing a
// pointer, in which case we need the whole thing.
//
if (!ptr_)
inherits (c);
names (c);
}
void query_columns::
composite (semantics::data_member* m, semantics::class_& c)
{
// Base type.
//
if (m == 0)
{
object_columns_base::composite (m, c);
return;
}
string name (public_name (*m));
if (decl_)
{
os << "// " << name << endl
<< "//" << endl
<< "struct " << name
<< "{";
object_columns_base::composite (m, c);
os << "};";
}
else
{
string old_scope (scope_);
scope_ += "::" + name;
object_columns_base::composite (m, c);
scope_ = old_scope;
}
}
bool query_columns::
column (semantics::data_member& m, string const& col_name, bool)
{
string name (public_name (m));
if (semantics::class_* c = object_pointer (m.type ()))
{
// We cannot just typedef the query_type from the referenced
// object for two reasons: (1) it may not be defined yet and
// (2) it will contain columns for its own pointers which
// won't work (for now we only support one level of indirection
// in queries). So we will have to duplicate the columns (sans
// the pointers).
//
// There are a number of problems with this approach: Regarding (1),
// the class have to be defined during ODB compilation in which
// case the ODB compiler will hunt down the #include statement
// and add it to the generated code. Regarding (2), things get
// complicated really quickly once we bring inheritance into
// the picture (name conflicts, etc). Plus, it is nice to reuse
// things. So the long-term solution is probably to make it a
// template with the table name as an argument.
//
if (ptr_)
{
ptr_ = false;
if (decl_)
{
os << "// " << name << endl
<< "//" << endl
<< "struct " << name
<< "{";
traverse (*c);
os << "};";
}
else
{
string old_scope (scope_), old_table (table_);
scope_ += "::" + name;
table_ = table_qname (*c);
traverse (*c);
table_ = old_table;
scope_ = old_scope;
}
ptr_ = true;
}
}
else
{
string db_type_id (database_type_id (m));
string type (
string (db.string ()) + "::value_traits< "
+ m.type ().fq_name (m.belongs ().hint ()) + ", "
+ db_type_id
+ " >::query_type");
if (decl_)
{
os << "// " << name << endl
<< "//" << endl
<< "static const " << db << "::query_column<" << endl
<< " " << type << "," << endl
<< " " << db_type_id << " >" << endl
<< name << ";"
<< endl;
}
else
{
// Leave the default table name unless we are generating members
// for a referenced object.
//
string column;
if (!ptr_)
{
// If this is a self-reference, use the special '_' alias.
//
if (table_ != default_table_)
column = table_;
else
column = "_";
}
column += '.';
column += quote_id (col_name);
os << "const " << db << "::query_column<" << endl
<< " " << type << "," << endl
<< " " << db_type_id << " >" << endl
<< scope_ << "::" << name << " (" << endl
<< strlit (column) << ");"
<< endl;
}
}
return true;
}
//
// Dynamic traversal support.
//
struct demangled_name
{
demangled_name (): s (0), n (0) {}
~demangled_name () {free (s);}
char* s;
size_t n;
};
static demangled_name name_;
database entry_base::
db (type_info const& ti)
{
char*& s (name_.s);
int r;
s = abi::__cxa_demangle (ti.name (), s, &name_.n, &r);
if (r != 0)
abort (); // We are in static initialization, so this is fatal.
string str (s + 12); // 12 for "relational::"
istringstream is (string (str, 0, str.find (':')));
database d;
if (!(is >> d))
abort ();
return d;
}
}
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