Split MySQL code generator into common and db-specific parts

The common part (in relational/) still has some MySQL-specific parts.
Also, add the notion of the current context which is used to avoid
explicitly passing the context object to every generator's c-tor.

1 files changed, 101 insertions, 0 deletions

diff --git a/odb/relational/schema.cxx b/odb/relational/schema.cxx
new file mode 100644
index 0000000..0836e03
--- /dev/null
+++ b/odb/relational/schema.cxx
@@ -0,0 +1,101 @@
+// file      : odb/relational/schema.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 <odb/emitter.hxx>
+
+#include <odb/relational/schema.hxx>
+#include <odb/relational/generate.hxx>
+
+using namespace std;
+
+namespace relational
+{
+  namespace schema
+  {
+    struct schema_emitter: emitter, context
+    {
+      virtual void
+      pre ()
+      {
+        first_ = true;
+      }
+
+      virtual void
+      line (const std::string& l)
+      {
+        if (first_)
+          first_ = false;
+        else
+          os << endl;
+
+        os << l;
+      }
+
+      virtual void
+      post ()
+      {
+        os << ';' << endl
+           << endl;
+      }
+
+    private:
+      bool first_;
+    };
+
+    static char const file_header[] =
+    "/* This file was generated by ODB, object-relational mapping (ORM)\n"
+    " * compiler for C++.\n"
+    " */\n\n";
+
+    void
+    generate ()
+    {
+      context ctx;
+      ostream& os (ctx.os);
+
+      os << file_header;
+
+      schema_emitter emitter;
+
+      // Drop.
+      //
+      {
+        traversal::unit unit;
+        traversal::defines unit_defines;
+        traversal::namespace_ ns;
+        instance<class_drop> c (emitter);
+
+        unit >> unit_defines >> ns;
+        unit_defines >> c;
+
+        traversal::defines ns_defines;
+
+        ns >> ns_defines >> ns;
+        ns_defines >> c;
+        unit.dispatch (ctx.unit);
+      }
+
+      os << endl;
+
+      // Create.
+      //
+      {
+        traversal::unit unit;
+        traversal::defines unit_defines;
+        traversal::namespace_ ns;
+        instance<class_create> c (emitter);
+
+        unit >> unit_defines >> ns;
+        unit_defines >> c;
+
+        traversal::defines ns_defines;
+
+        ns >> ns_defines >> ns;
+        ns_defines >> c;
+        unit.dispatch (ctx.unit);
+      }
+    }
+  }
+}