// file      : xsd/cxx/tree/generator.cxx
// author    : Boris Kolpackov <boris@codesynthesis.com>
// copyright : Copyright (c) 2005-2011 Code Synthesis Tools CC
// license   : GNU GPL v2 + exceptions; see accompanying LICENSE file

#include <vector>
#include <algorithm>
#include <iostream>
#include <fstream>

#include <cutl/re.hxx>
#include <cutl/shared-ptr.hxx>

#include <cutl/compiler/code-stream.hxx>
#include <cutl/compiler/cxx-indenter.hxx>
#include <cutl/compiler/sloc-counter.hxx>

#include <xsd-frontend/semantic-graph.hxx>
#include <xsd-frontend/generators/dependencies.hxx>

#include <cxx/tree/generator.hxx>

#include <cxx/tree/elements.hxx>

#include <cxx/tree/counter.hxx>
#include <cxx/tree/validator.hxx>
#include <cxx/tree/name-processor.hxx>
#include <cxx/tree/polymorphism-processor.hxx>

#include <cxx/tree/tree-forward.hxx>
#include <cxx/tree/tree-header.hxx>
#include <cxx/tree/tree-inline.hxx>
#include <cxx/tree/tree-source.hxx>

#include <cxx/tree/parser-header.hxx>
#include <cxx/tree/parser-source.hxx>

#include <cxx/tree/stream-header.hxx>
#include <cxx/tree/stream-source.hxx>

#include <cxx/tree/serialization-header.hxx>
#include <cxx/tree/serialization-source.hxx>

#include <cxx/tree/stream-insertion-header.hxx>
#include <cxx/tree/stream-insertion-source.hxx>
#include <cxx/tree/stream-extraction-source.hxx>

#include <cxx/tree/options.hxx>

#include "../../../libxsd/xsd/cxx/version.hxx"

using namespace std;
using namespace cutl;
using namespace XSDFrontend::SemanticGraph;

//
//
typedef std::wifstream WideInputFileStream;
typedef std::wofstream WideOutputFileStream;

namespace CXX
{
  namespace
  {
    char const copyright_gpl[] =
    "// Copyright (c) 2005-2011 Code Synthesis Tools CC\n"
    "//\n"
    "// This program was generated by CodeSynthesis XSD, an XML Schema to\n"
    "// C++ data binding compiler.\n"
    "//\n"
    "// This program is free software; you can redistribute it and/or modify\n"
    "// it under the terms of the GNU General Public License version 2 as\n"
    "// published by the Free Software Foundation.\n"
    "//\n"
    "// This program is distributed in the hope that it will be useful,\n"
    "// but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
    "// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
    "// GNU General Public License for more details.\n"
    "//\n"
    "// You should have received a copy of the GNU General Public License\n"
    "// along with this program; if not, write to the Free Software\n"
    "// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA\n"
    "//\n"
    "// In addition, as a special exception, Code Synthesis Tools CC gives\n"
    "// permission to link this program with the Xerces-C++ library (or with\n"
    "// modified versions of Xerces-C++ that use the same license as Xerces-C++),\n"
    "// and distribute linked combinations including the two. You must obey\n"
    "// the GNU General Public License version 2 in all respects for all of\n"
    "// the code used other than Xerces-C++. If you modify this copy of the\n"
    "// program, you may extend this exception to your version of the program,\n"
    "// but you are not obligated to do so. If you do not wish to do so, delete\n"
    "// this exception statement from your version.\n"
    "//\n"
    "// Furthermore, Code Synthesis Tools CC makes a special exception for\n"
    "// the Free/Libre and Open Source Software (FLOSS) which is described\n"
    "// in the accompanying FLOSSE file.\n"
    "//\n\n";

    char const copyright_proprietary[] =
    "// Copyright (c) 2005-2011 Code Synthesis Tools CC\n"
    "//\n"
    "// This program was generated by CodeSynthesis XSD, an XML Schema\n"
    "// to C++ data binding compiler, in the Proprietary License mode.\n"
    "// You should have received a proprietary license from Code Synthesis\n"
    "// Tools CC prior to generating this code. See the license text for\n"
    "// conditions.\n"
    "//\n\n";
  }

  void Tree::Generator::
  usage ()
  {
    CXX::Tree::options::print_usage (wcout);
    CXX::options::print_usage (wcout);
  }

  namespace
  {
    void
    open (WideInputFileStream& ifs, NarrowString const& path)
    {
      try
      {
        Path fs_path (path);
        ifs.open (fs_path.string ().c_str (),
                  std::ios_base::in | std::ios_base::binary);

        if (!ifs.is_open ())
        {
          wcerr << path.c_str () << ": error: unable to open in read mode"
                << endl;

          throw Tree::Generator::Failed ();
        }
      }
      catch (InvalidPath const&)
      {
        wcerr << "error: '" << path.c_str () << "' is not a valid "
              << "filesystem path" << endl;

        throw Tree::Generator::Failed ();
      }
    }

    void
    append (WideOutputFileStream& os,
            NarrowString const& path,
            WideInputFileStream& default_is)
    {
      using std::ios_base;

      if (path)
      {
        WideInputFileStream is;
        open (is, path);
        os << is.rdbuf ();
      }
      else if (default_is.is_open ())
      {
        os << default_is.rdbuf ();
        default_is.seekg (0, ios_base::beg);
      }
    }

    void
    append (WideOutputFileStream& os,
            NarrowStrings const& primary,
            NarrowStrings const& def)
    {
      NarrowStrings const& v (primary.empty () ? def : primary);

      for (NarrowStrings::const_iterator i (v.begin ()), e (v.end ());
           i != e; ++i)
      {
        os << i->c_str () << endl;
      }
    }
  }


  size_t Tree::Generator::
  generate (Tree::options const& ops,
            Schema& schema,
            Path const& file_path,
            bool fpt,
            StringLiteralMap const& string_literal_map,
            const WarningSet& disabled_warnings,
            FileList& file_list,
            AutoUnlinks& unlinks)
  {
    using cutl::shared_ptr;
    typedef cutl::re::regexsub Regex;

    typedef vector<Path> Paths;
    typedef vector<shared_ptr<WideOutputFileStream> > WideOutputFileStreams;

    try
    {
      // Do option validation.
      //
      if (ops.parts () < 1)
      {
        wcerr << "error: invalid value for option --parts: " <<
          ops.parts () << endl;
        throw Failed ();
      }

      // Get counts.
      //
      Counts counts;
      {
        Counter counter;
        counts = counter.count (ops, schema, file_path);

        /*
        wcerr << "global type count: " << counts.global_types << endl;
        wcerr << "global element count: " << counts.global_elements << endl;
        wcerr << "generated global element count: " <<
          counts.generated_global_elements << endl;

        wcerr << "total complexity: " << counts.complexity_total << endl;
        wcerr << "complexity vector size: " << counts.complexity.size ()
              << endl;
        */
      }

      // Evaluate the graph for possibility of generating something useful.
      //
      {
        Validator validator;
        if (!validator.validate (
              ops, schema, file_path, disabled_warnings, counts))
          throw Failed ();
      }

      bool gen_cxx (!ops.generate_dep_only ());

      // Process names.
      //
      if (gen_cxx)
      {
        NameProcessor proc;
        if (!proc.process (ops, schema, file_path, string_literal_map))
          throw Failed ();
      }

      // Process polymorphic types.
      //
      if (gen_cxx &&
          ops.generate_polymorphic () &&
          !ops.polymorphic_type_all ())
      {
        PolymorphismProcessor proc;
        if (!proc.process (ops, schema, file_path, disabled_warnings))
          throw Failed ();
      }

      // Parts.
      //
      size_t parts (ops.parts ());
      size_t units (counts.global_types + counts.generated_global_elements);
      size_t units_per_part (units / parts);

      if (parts != 1 && units_per_part < 1)
      {
        wcerr << "error: too many parts specified: " << parts << endl;
        throw Failed ();
      }

      size_t complexity_per_part (counts.complexity_total / parts);


      NarrowString parts_suffix (ops.parts_suffix ());

      //
      //
      bool generate_xml_schema (ops.generate_xml_schema ());

      // We could be compiling several schemas at once in which case
      // handling of the --generate-xml-schema option gets tricky: we
      // will need to rely on the presence of the --extern-xml-schema
      // to tell us which (fake) schema file corresponds to XML Schema.
      //
      if (generate_xml_schema)
      {
        if (NarrowString name = ops.extern_xml_schema ())
        {
          if (file_path.string () != name)
            generate_xml_schema = false;
        }
      }

      bool header (true);
      bool inline_ (ops.generate_inline () && !generate_xml_schema);
      bool forward (ops.generate_forward () && !generate_xml_schema);
      bool source (!generate_xml_schema);
      bool gen_dep ((ops.generate_dep () || ops.generate_dep_only ()) &&
                    !generate_xml_schema);

      if (ops.generate_dep_only () && generate_xml_schema)
      {
        wcerr << "error: no dependency information can be generated for "
          "XML Schema header" << endl;
        throw Failed ();
      }

      if (gen_dep && fpt)
      {
        wcerr << "error: dependency generation not support in the " <<
          "file-per-type mode" << endl;
        throw Failed ();
      }

      // Generate code.
      //
      NarrowString name (file_path.leaf ().string ());

      NarrowString hxx_suffix (ops.hxx_suffix ());
      NarrowString ixx_suffix (ops.ixx_suffix ());
      NarrowString cxx_suffix (ops.cxx_suffix ());
      NarrowString fwd_suffix (ops.fwd_suffix ());
      NarrowString dep_suffix (ops.dep_suffix ());

      Regex hxx_expr (ops.hxx_regex ().empty ()
                      ? "#^(.+?)(\\.[^./\\\\]+)?$#$1" + hxx_suffix + "#"
                      : ops.hxx_regex ());

      Regex ixx_expr (ops.ixx_regex ().empty ()
                      ? "#^(.+?)(\\.[^./\\\\]+)?$#$1" + ixx_suffix + "#"
                      : ops.ixx_regex ());

      Regex cxx_expr (ops.cxx_regex ().empty ()
                      ? "#^(.+?)(\\.[^./\\\\]+)?$#$1" + cxx_suffix + "#"
                      : ops.cxx_regex ());

      Regex fwd_expr (ops.fwd_regex ().empty ()
                      ? "#^(.+?)(\\.[^./\\\\]+)?$#$1" + fwd_suffix + "#"
                      : ops.fwd_regex ());

      Regex dep_expr (ops.dep_regex ().empty ()
                      ? "#^(.+?)(\\.[^./\\\\]+)?$#$1" + dep_suffix + "#"
                      : ops.dep_regex ());

      if (header && !hxx_expr.match (name))
      {
        wcerr << "error: header expression '" <<
          hxx_expr.regex ().str ().c_str () << "' does not match '" <<
          name.c_str () << "'" << endl;
        throw Failed ();
      }

      if (inline_ && !ixx_expr.match (name))
      {
        wcerr << "error: inline expression '" <<
          ixx_expr.regex ().str ().c_str () << "' does not match '" <<
          name.c_str () << "'" << endl;
        throw Failed ();
      }

      if (source && parts == 1 && !cxx_expr.match (name))
      {
        wcerr << "error: source expression '" <<
          cxx_expr.regex ().str ().c_str () << "' does not match '" <<
          name.c_str () << "'" << endl;
        throw Failed ();
      }

      if (forward && !fwd_expr.match (name))
      {
        wcerr << "error: forward expression '" <<
          fwd_expr.regex ().str ().c_str () << "' does not match '" <<
          name.c_str () << "'" << endl;
        throw Failed ();
      }

      if (gen_dep && !dep_expr.match (name))
      {
        wcerr << "error: dependency expression '" <<
          dep_expr.regex ().str ().c_str () << "' does not match '" <<
          name.c_str () << "'" << endl;
        throw Failed ();
      }

      NarrowString hxx_name (header ? hxx_expr.replace (name) : NarrowString ());
      NarrowString ixx_name (inline_ ? ixx_expr.replace (name) : NarrowString ());
      NarrowString fwd_name (forward ? fwd_expr.replace (name) : NarrowString ());
      NarrowString dep_name (gen_dep ? dep_expr.replace (name) : NarrowString ());

      Path hxx_path (hxx_name);
      Path ixx_path (ixx_name);
      Path fwd_path (fwd_name);
      Path dep_path (dep_name);
      Paths cxx_paths;

      if (source)
      {
        if (parts > 1)
        {
          for (size_t i (0); i < parts; ++i)
          {
            std::ostringstream os;
            os << i;

            Regex expr (
              "#^(.+?)(\\.[^./\\\\]+)?$#$1" + parts_suffix + os.str () + "$2#");

            NarrowString part_name (expr.replace (name));

            if (!cxx_expr.match (part_name))
            {
              wcerr << "error: source expression '" <<
                cxx_expr.regex ().str ().c_str () << "' does not match '" <<
                part_name.c_str () << "'" << endl;
              throw Failed ();
            }

            cxx_paths.push_back (Path (cxx_expr.replace (part_name)));
          }
        }
        else
          cxx_paths.push_back (Path (cxx_expr.replace (name)));
      }

      Path out_dir;

      if (NarrowString dir = ops.output_dir ())
      {
        try
        {
          out_dir = Path (dir);
        }
        catch (InvalidPath const&)
        {
          wcerr << dir.c_str () << ": error: invalid path" << endl;
          throw Failed ();
        }
      }

      if (fpt && !generate_xml_schema)
      {
        // In the file-per-type mode the schema files are always local
        // unless the user added the directory so that we propagate this
        // to the output files.
        //
        Path fpt_dir (file_path.directory ());

        if (!fpt_dir.empty ())
          out_dir /= fpt_dir;
      }

      if (!out_dir.empty ())
      {
        hxx_path = out_dir / hxx_path;
        ixx_path = out_dir / ixx_path;
        fwd_path = out_dir / fwd_path;
        dep_path = out_dir / dep_path;

        for (Paths::iterator i (cxx_paths.begin ());
             i != cxx_paths.end (); ++i)
          *i = out_dir / *i;
      }

      //
      //
      WideOutputFileStream hxx;
      WideOutputFileStream ixx;
      WideOutputFileStream fwd;
      WideOutputFileStream dep;
      WideOutputFileStreams cxx;

      // DEP
      //
      if (gen_dep)
      {
        dep.open (dep_path.string ().c_str (), ios_base::out);

        if (!dep.is_open ())
        {
          wcerr << dep_path << ": error: unable to open in write mode" << endl;
          throw Failed ();
        }

        unlinks.add (dep_path);
        file_list.push_back (dep_path.string ());
      }

      // FWD
      //
      if (gen_cxx && forward)
      {
        fwd.open (fwd_path.string ().c_str (), ios_base::out);

        if (!fwd.is_open ())
        {
          wcerr << fwd_path << ": error: unable to open in write mode" << endl;
          throw Failed ();
        }

        unlinks.add (fwd_path);
        file_list.push_back (fwd_path.string ());
      }

      // HXX
      //
      if (gen_cxx && header)
      {
        hxx.open (hxx_path.string ().c_str (), ios_base::out);

        if (!hxx.is_open ())
        {
          wcerr << hxx_path << ": error: unable to open in write mode" << endl;
          throw Failed ();
        }

        unlinks.add (hxx_path);
        file_list.push_back (hxx_path.string ());
      }

      // IXX
      //
      if (gen_cxx && inline_)
      {
        ixx.open (ixx_path.string ().c_str (), ios_base::out);

        if (!ixx.is_open ())
        {
          wcerr << ixx_path << ": error: unable to open in write mode" << endl;
          throw Failed ();
        }

        unlinks.add (ixx_path);
        file_list.push_back (ixx_path.string ());
      }

      // CXX
      //
      if (gen_cxx && source)
      {
        for (Paths::iterator i (cxx_paths.begin ());
             i != cxx_paths.end (); ++i)
        {
          shared_ptr<WideOutputFileStream> s (
            new (shared) WideOutputFileStream (
              i->string ().c_str (), ios_base::out));

          if (!s->is_open ())
          {
            wcerr << *i << ": error: unable to open in write mode" << endl;
            throw Failed ();
          }

          unlinks.add (*i);
          file_list.push_back (i->string ());
          cxx.push_back (s);
        }
      }

      // Print copyright and license.
      //
      char const* copyright (
        ops.proprietary_license () ? copyright_proprietary : copyright_gpl);

      if (gen_cxx && header)
        hxx << copyright;

      if (gen_cxx && forward)
        fwd << copyright;

      if (ops.generate_doxygen ())
      {
        // Use native path format.
        //
        hxx << "/**" << endl
            << " * @file" << endl
            << " * @brief Generated from " << name.c_str () << "." << endl
            << " */" << endl
            << endl;

      }

      if (gen_cxx && inline_)
        ixx << copyright;

      if (gen_cxx && source)
      {
        for (WideOutputFileStreams::iterator i (cxx.begin ());
             i != cxx.end (); ++i)
          **i << copyright;
      }


      // Prologue.
      //
      WideInputFileStream prologue;
      {
        NarrowString name (ops.prologue_file ());

        if (name)
          open (prologue, name);
      }

      // Epilogue.
      //
      WideInputFileStream epilogue;
      {
        NarrowString name (ops.epilogue_file ());

        if (name)
          open (epilogue, name);
      }

      // SLOC counter.
      //
      size_t sloc_total (0);
      bool show_sloc (ops.show_sloc ());

      typedef
      compiler::ostream_filter<compiler::cxx_indenter, wchar_t>
      ind_filter;

      typedef
      compiler::ostream_filter<compiler::sloc_counter, wchar_t>
      sloc_filter;

      //
      //
      Regex guard_expr ("/([a-z])([A-Z])/$1_$2/"); // Split words.
      NarrowString guard_prefix (ops.guard_prefix ());

      if (!guard_prefix)
        guard_prefix = file_path.directory ().string ();

      if (guard_prefix)
        guard_prefix += '_';

      // DEP
      //
      if (gen_dep)
      {
        NarrowString target;
        NarrowStrings const& ts (ops.dep_target ());

        if (!ts.empty ())
        {
          for (NarrowStrings::const_iterator i (ts.begin ());
               i != ts.end (); ++i)
            target += (target.empty () ? "" : " \\\n") + *i;
        }
        else
        {
          target = hxx_path.string ();

          if (forward)
            target += " \\\n" + fwd_path.string ();

          if (inline_)
            target += " \\\n" + ixx_path.string ();

          for (Paths::iterator i (cxx_paths.begin ());
               i != cxx_paths.end (); ++i)
            target += " \\\n" + i->string ();

          target += " \\\n" + dep_path.string ();
        }

        dep << target.c_str () << ':';

        XSDFrontend::Generators::Dependencies gen;
        Paths prq (gen.generate (schema, file_path));

        for (Paths::iterator i (prq.begin ()); i != prq.end (); ++i)
          dep << " \\" << endl
              << "  " << *i;

        dep << endl;

        // If requested, generate phony rules for included/imported schemas
        // but not the main file which is the first in the list.
        //
        if (ops.dep_phony () && prq.size () > 1)
        {
          for (Paths::iterator i (prq.begin () + 1); i != prq.end (); ++i)
            dep << endl
                << *i << ':' << endl;
        }
      }

      // FWD
      //
      if (gen_cxx && forward)
      {
        Context ctx (fwd,
                     schema,
                     file_path,
                     ops,
                     counts,
                     generate_xml_schema,
                     &string_literal_map,
                     &fwd_expr,
                     &hxx_expr,
                     &ixx_expr);

        sloc_filter sloc (fwd);

        // Guard
        //
        String guard (guard_expr.replace (guard_prefix + fwd_name));
        guard = ctx.escape (guard); // make a c++ id
        std::transform (guard.begin (), guard.end(), guard.begin (), upcase);

        fwd << "#ifndef " << guard << endl
            << "#define " << guard << endl
            << endl;

        if (ctx.std >= cxx_version::cxx11)
        {
          fwd << "#ifndef XSD_CXX11" << endl
              << "#define XSD_CXX11" << endl
              << "#endif" << endl
              << endl;
        }

        if (ctx.char_type == L"char")
        {
          fwd << "#ifndef XSD_USE_CHAR" << endl
              << "#define XSD_USE_CHAR" << endl
              << "#endif" << endl
              << endl;

          fwd << "#ifndef XSD_CXX_TREE_USE_CHAR" << endl
              << "#define XSD_CXX_TREE_USE_CHAR" << endl
              << "#endif" << endl
              << endl;
        }
        else if (ctx.char_type == L"wchar_t")
        {
          fwd << "#ifndef XSD_USE_WCHAR" << endl
              << "#define XSD_USE_WCHAR" << endl
              << "#endif" << endl
              << endl;

          fwd << "#ifndef XSD_CXX_TREE_USE_WCHAR" << endl
              << "#define XSD_CXX_TREE_USE_WCHAR" << endl
              << "#endif" << endl
              << endl;
        }

        // Version check.
        //
        fwd << "#include <xsd/cxx/version.hxx>" << endl
            << endl
            << "#if (XSD_INT_VERSION != " << XSD_INT_VERSION << "L)" << endl
            << "#error XSD runtime version mismatch" << endl
            << "#endif" << endl
            << endl;

        fwd << "#include <xsd/cxx/pre.hxx>" << endl
              << endl;

        // Copy prologue.
        //
        fwd << "// Begin prologue." << endl
            << "//" << endl;

        append (fwd, ops.fwd_prologue (), ops.prologue ());
        append (fwd, ops.fwd_prologue_file (), prologue);

        fwd << "//" << endl
            << "// End prologue." << endl
            << endl;

        // Generate.
        //
        {
          ind_filter ind (fwd); // We don't want to indent prologues/epilogues.
          generate_forward (ctx);
        }

        // Copy epilogue.
        //
        fwd << "// Begin epilogue." << endl
            << "//" << endl;

        append (fwd, ops.fwd_epilogue_file (), epilogue);
        append (fwd, ops.fwd_epilogue (), ops.epilogue ());

        fwd << "//" << endl
            << "// End epilogue." << endl
            << endl;

        fwd << "#include <xsd/cxx/post.hxx>" << endl
            << endl;

        fwd << "#endif // " << guard << endl;

        if (show_sloc)
          wcerr << fwd_path << ": " << sloc.stream ().count () << endl;

        sloc_total += sloc.stream ().count ();
      }

      // HXX
      //
      if (gen_cxx && header)
      {
        Context ctx (hxx,
                     schema,
                     file_path,
                     ops,
                     counts,
                     generate_xml_schema,
                     &string_literal_map,
                     &fwd_expr,
                     &hxx_expr,
                     &ixx_expr);

        sloc_filter sloc (hxx);

        // Guard
        //
        String guard (guard_expr.replace (guard_prefix + hxx_name));
        guard = ctx.escape (guard); // make a c++ id
        std::transform (guard.begin (), guard.end(), guard.begin (), upcase);

        hxx << "#ifndef " << guard << endl
            << "#define " << guard << endl
            << endl;

        if (!forward)
        {
          if (ctx.std >= cxx_version::cxx11)
          {
            hxx << "#ifndef XSD_CXX11" << endl
                << "#define XSD_CXX11" << endl
                << "#endif" << endl
                << endl;
          }

          if (ctx.char_type == L"char")
          {
            hxx << "#ifndef XSD_USE_CHAR" << endl
                << "#define XSD_USE_CHAR" << endl
                << "#endif" << endl
                << endl;

            hxx << "#ifndef XSD_CXX_TREE_USE_CHAR" << endl
                << "#define XSD_CXX_TREE_USE_CHAR" << endl
                << "#endif" << endl
                << endl;
          }
          else if (ctx.char_type == L"wchar_t")
          {
            hxx << "#ifndef XSD_USE_WCHAR" << endl
                << "#define XSD_USE_WCHAR" << endl
                << "#endif" << endl
                << endl;

            hxx << "#ifndef XSD_CXX_TREE_USE_WCHAR" << endl
                << "#define XSD_CXX_TREE_USE_WCHAR" << endl
                << "#endif" << endl
                << endl;
          }
        }

        // Version check.
        //
        hxx << "#include <xsd/cxx/config.hxx>" << endl
            << endl
            << "#if (XSD_INT_VERSION != " << XSD_INT_VERSION << "L)" << endl
            << "#error XSD runtime version mismatch" << endl
            << "#endif" << endl
            << endl;

        hxx << "#include <xsd/cxx/pre.hxx>" << endl
            << endl;

        // Copy prologue.
        //
        hxx << "// Begin prologue." << endl
            << "//" << endl;

        append (hxx, ops.hxx_prologue (), ops.prologue ());
        append (hxx, ops.hxx_prologue_file (), prologue);

        hxx << "//" << endl
            << "// End prologue." << endl
            << endl;

        // Generate.
        //
        {
          ind_filter ind (hxx); // We don't want to indent prologues/epilogues.

          if (!generate_xml_schema)
          {
            if (forward)
              hxx << "#include " << ctx.process_include_path (fwd_name)
                  << endl << endl;
            else
              generate_forward (ctx);
          }

          generate_tree_header (ctx);

          if (!generate_xml_schema)
          {
            if (ops.generate_ostream ())
              generate_stream_header (ctx);

            if (!ops.generate_element_type () && !ops.suppress_parsing ())
              generate_parser_header (ctx);

            if (ops.generate_serialization ())
              generate_serialization_header (ctx);

            if (!ops.generate_insertion ().empty ())
              generate_stream_insertion_header (ctx);
          }
        }

        if (inline_)
        {
          hxx << "#ifndef XSD_DONT_INCLUDE_INLINE" << endl
              << "#include " << ctx.process_include_path (ixx_name) << endl
              << "#endif // XSD_DONT_INCLUDE_INLINE" << endl
              << endl;
        }

        // Copy epilogue.
        //
        hxx << "// Begin epilogue." << endl
            << "//" << endl;

        append (hxx, ops.hxx_epilogue_file (), epilogue);
        append (hxx, ops.hxx_epilogue (), ops.epilogue ());

        hxx << "//" << endl
            << "// End epilogue." << endl
            << endl;

        hxx << "#include <xsd/cxx/post.hxx>" << endl
              << endl;

        hxx << "#endif // " << guard << endl;

        if (show_sloc)
          wcerr << hxx_path << ": " << sloc.stream ().count () << endl;

        sloc_total += sloc.stream ().count ();
      }


      // IXX
      //
      if (gen_cxx && inline_)
      {
        Context ctx (ixx,
                     schema,
                     file_path,
                     ops,
                     counts,
                     generate_xml_schema,
                     &string_literal_map,
                     &fwd_expr,
                     &hxx_expr,
                     &ixx_expr);

        sloc_filter sloc (ixx);

        // Guard
        //
        String guard (guard_expr.replace (guard_prefix + ixx_name));
        guard = ctx.escape (guard); // make a c++ id
        std::transform (guard.begin (), guard.end(), guard.begin (), upcase);

        ixx << "#ifndef " << guard.c_str () << endl
            << "#define " << guard.c_str () << endl
            << endl;

        // Copy prologue.
        //
        ixx << "// Begin prologue." << endl
            << "//" << endl;

        append (ixx, ops.ixx_prologue (), ops.prologue ());
        append (ixx, ops.ixx_prologue_file (), prologue);

        ixx << "//" << endl
            << "// End prologue." << endl
            << endl;

        // Generate.
        //
        {
          ind_filter ind (ixx); // We don't want to indent prologues/epilogues.
          generate_tree_inline (ctx, 1, 0);
        }

        // Copy epilogue.
        //
        ixx << "// Begin epilogue." << endl
            << "//" << endl;

        append (ixx, ops.ixx_epilogue_file (), epilogue);
        append (ixx, ops.ixx_epilogue (), ops.epilogue ());

        ixx << "//" << endl
            << "// End epilogue." << endl
            << endl;

        ixx << "#endif // " << guard.c_str () << endl;

        if (show_sloc)
          wcerr << ixx_path << ": " << sloc.stream ().count () << endl;

        sloc_total += sloc.stream ().count ();
      }

      // CXX
      //
      if (gen_cxx && source)
      {
        size_t first_unit (0); // First unit in the current part.

        for (size_t part (0); part < parts; ++part)
        {
          // Figure out the range of units for this part.
          //
          size_t last_unit (first_unit);

          if (units != 0)
          {
            size_t complexity (counts.complexity[last_unit]);

            while (complexity < complexity_per_part)
            {
              // Make sure there will be at least one unit for each part left.
              //
              if ((last_unit + 1) >= units ||
                  (units - (last_unit + 1) - 1) < (parts - part - 1))
                break;

              // Check if the increase in complexity should be kept in this
              // part or moved to the next.
              //
              size_t new_complexity (
                complexity + counts.complexity[last_unit + 1]);

              if (new_complexity > complexity_per_part)
              {
                if ((new_complexity - complexity_per_part) >
                    (counts.complexity[last_unit + 1] / 2))
                  break;
              }

              last_unit++;
              complexity = new_complexity;
            }

            if (part + 1 == parts)
            {
              // Last part.
              //
              last_unit = units - 1;
            }
          }

          //
          //
          size_t first (first_unit);
          size_t last (last_unit);

          first_unit = last_unit + 1;

          //wcerr << "[" << first << ", " << last << "]: " << complexity
          //      << endl;

          WideOutputFileStream& os (*cxx[part]);

          Context ctx (os,
                       schema,
                       file_path,
                       ops,
                       counts,
                       generate_xml_schema,
                       &string_literal_map,
                       &fwd_expr,
                       &hxx_expr,
                       &ixx_expr);

          sloc_filter sloc (os);

          os << "#include <xsd/cxx/pre.hxx>" << endl
             << endl;

          // Copy prologue.
          //
          os << "// Begin prologue." << endl
             << "//" << endl;

          append (os, ops.cxx_prologue (), ops.prologue ());
          append (os, ops.cxx_prologue_file (), prologue);

          os << "//" << endl
             << "// End prologue." << endl
             << endl;

          os << "#include " << ctx.process_include_path (hxx_name) << endl
             << endl;

          // Generate.
          //
          {
            // We don't want to indent prologues/epilogues.
            //
            ind_filter ind (os);

            if (!inline_)
              generate_tree_inline (ctx, first, last);

            generate_tree_source (ctx, first, last);

            if (ops.generate_ostream ())
              generate_stream_source (ctx, first, last);

            if (!ops.generate_element_type () && !ops.suppress_parsing ())
              generate_parser_source (ctx, first, last);

            if (ops.generate_serialization ())
              generate_serialization_source (ctx, first, last);

            if (!ops.generate_extraction ().empty ())
              generate_stream_extraction_source (ctx);

            if (!ops.generate_insertion ().empty ())
              generate_stream_insertion_source (ctx);
          }

          // Copy epilogue.
          //
          os << "// Begin epilogue." << endl
             << "//" << endl;

          append (os, ops.cxx_epilogue_file (), epilogue);
          append (os, ops.cxx_epilogue (), ops.epilogue ());

          os << "//" << endl
             << "// End epilogue." << endl
             << endl;

          os << "#include <xsd/cxx/post.hxx>" << endl
             << endl;

          if (show_sloc)
            wcerr << cxx_paths[part] << ": " << sloc.stream ().count ()
                  << endl;

          sloc_total += sloc.stream ().count ();
        }
      }

      return sloc_total;
    }
    catch (UnrepresentableCharacter const& e)
    {
      wcerr << "error: character at position " << e.position () << " "
            << "in string '" << e.string () << "' is unrepresentable in "
            << "the target encoding" << endl;

      wcerr << "info: use the --custom-literals option to provide custom "
            << "string literals mapping" << endl;

      throw Failed ();
    }
    catch (NoNamespaceMapping const& e)
    {
      wcerr << e.file () << ":" << e.line () << ":" << e.column ()
            << ": error: unable to map XML Schema namespace '" << e.ns ()
            << "' to C++ namespace" << endl;

      wcerr << e.file () << ":" << e.line () << ":" << e.column ()
            << ": info: use the --namespace-map or --namespace-regex option "
            << "to provide custom mapping" << endl;

      throw Failed ();
    }
    catch (InvalidNamespaceMapping const& e)
    {
      wcerr << "error: invalid XML to C++ namespace mapping specified: "
            << "'" << e.mapping () << "': " << e.reason () << endl;

      throw Failed ();
    }
    catch (InvalidCustomTypeMapping const& e)
    {
      wcerr << "error: invalid custom type mapping specified: "
            << "'" << e.mapping () << "': " << e.reason () << endl;

      throw Failed ();
    }
    catch (cutl::re::format const& e)
    {
      wcerr << "error: invalid regex: '" <<
        e.regex ().c_str () << "': " <<
        e.description ().c_str () << endl;

      throw Failed ();
    }
    catch (cutl::re::wformat const& e)
    {
      wcerr << "error: invalid regex: '" <<
        e.regex () << "': " << e.description ().c_str () << endl;

      throw Failed ();
    }
  }
}