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/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements. See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership. The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License. You may obtain a copy of the License at

 *

 *   http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing,

 * software distributed under the License is distributed on an

 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

 * KIND, either express or implied. See the License for the

 * specific language governing permissions and limitations

 * under the License.

 */

#include <string>

#include <fstream>

#include <iostream>

#include <vector>

#include <list>

#include <stdlib.h>

#include <sys/stat.h>

#include <sstream>

#include "t_oop_generator.h"

#include "platform.h"

using namespace std;

/**

 * PERL code generator.

 *

 */

class t_perl_generator : public t_oop_generator {

 public:

  t_perl_generator(

      t_program* program,

      const std::map<std::string, std::string>& parsed_options,

      const std::string& option_string)

    : t_oop_generator(program)

  {

    out_dir_base_ = "gen-perl";

    escape_['$'] = "\\$";

    escape_['@'] = "\\@";

  }

  /**

   * Init and close methods

   */

  void init_generator();

  void close_generator();

  /**

   * Program-level generation functions

   */

  void generate_typedef  (t_typedef*  ttypedef);

  void generate_enum     (t_enum*     tenum);

  void generate_const    (t_const*    tconst);

  void generate_struct   (t_struct*   tstruct);

  void generate_xception (t_struct*   txception);

  void generate_service  (t_service*  tservice);

  std::string render_const_value(t_type* type, t_const_value* value);

  /**

   * Structs!

   */

  void generate_perl_struct(t_struct* tstruct, bool is_exception);

  void generate_perl_struct_definition(std::ofstream& out, t_struct* tstruct, bool is_xception=false);

  void generate_perl_struct_reader(std::ofstream& out, t_struct* tstruct);

  void generate_perl_struct_writer(std::ofstream& out, t_struct* tstruct);

  void generate_perl_function_helpers(t_function* tfunction);

  /**

   * Service-level generation functions

   */

  void generate_service_helpers   (t_service* tservice);

  void generate_service_interface (t_service* tservice);

  void generate_service_rest      (t_service* tservice);

  void generate_service_client    (t_service* tservice);

  void generate_service_processor (t_service* tservice);

  void generate_process_function  (t_service* tservice, t_function* tfunction);

  /**

   * Serialization constructs

   */

  void generate_deserialize_field        (std::ofstream &out,

                                          t_field*    tfield,

                                          std::string prefix="",

                                          bool inclass=false);

  void generate_deserialize_struct       (std::ofstream &out,

                                          t_struct*   tstruct,

                                          std::string prefix="");

  void generate_deserialize_container    (std::ofstream &out,

                                          t_type*     ttype,

                                          std::string prefix="");

  void generate_deserialize_set_element  (std::ofstream &out,

                                          t_set*      tset,

                                          std::string prefix="");

  void generate_deserialize_map_element  (std::ofstream &out,

                                          t_map*      tmap,

                                          std::string prefix="");

  void generate_deserialize_list_element (std::ofstream &out,

                                          t_list*     tlist,

                                          std::string prefix="");

  void generate_serialize_field          (std::ofstream &out,

                                          t_field*    tfield,

                                          std::string prefix="");

  void generate_serialize_struct         (std::ofstream &out,

                                          t_struct*   tstruct,

                                          std::string prefix="");

  void generate_serialize_container      (std::ofstream &out,

                                          t_type*     ttype,

                                          std::string prefix="");

  void generate_serialize_map_element    (std::ofstream &out,

                                          t_map*      tmap,

                                          std::string kiter,

                                          std::string viter);

  void generate_serialize_set_element    (std::ofstream &out,

                                          t_set*      tmap,

                                          std::string iter);

  void generate_serialize_list_element   (std::ofstream &out,

                                          t_list*     tlist,

                                          std::string iter);

  /**

   * Helper rendering functions

   */

  std::string perl_includes();

  std::string declare_field(t_field* tfield, bool init=false, bool obj=false);

  std::string function_signature(t_function* tfunction, std::string prefix="");

  std::string argument_list(t_struct* tstruct);

  std::string type_to_enum(t_type* ttype);

  std::string autogen_comment() {

    return

      std::string("#\n") +

      "# Autogenerated by Thrift\n" +

      "#\n" +

      "# DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING\n" +

      "#\n";

  }

  void perl_namespace_dirs(t_program* p, std::list<std::string>& dirs) {

    std::string ns = p->get_namespace("perl");

    std::string::size_type loc;

    if (ns.size() > 0) {

      while ((loc = ns.find(".")) != std::string::npos) {

        dirs.push_back(ns.substr(0, loc));

        ns = ns.substr(loc+1);

      }

    }

    if (ns.size() > 0) {

      dirs.push_back(ns);

    }

  }

  std::string perl_namespace(t_program* p) {

    std::string ns = p->get_namespace("perl");

    std::string result = "";

    std::string::size_type loc;

    if (ns.size() > 0) {

      while ((loc = ns.find(".")) != std::string::npos) {

        result += ns.substr(0, loc);

        result += "::";

        ns = ns.substr(loc+1);

      }

      if (ns.size() > 0) {

        result += ns + "::";

      }

    }

    return result;

  }

  std::string get_namespace_out_dir() {

    std::string outdir = get_out_dir();

    std::list<std::string> dirs;

    perl_namespace_dirs(program_, dirs);

    std::list<std::string>::iterator it;

    for (it = dirs.begin(); it != dirs.end(); it++) {

      outdir += *it + "/";

    }

    return outdir;

  }

 private:

  /**

   * File streams

   */

  std::ofstream f_types_;

  std::ofstream f_consts_;

  std::ofstream f_helpers_;

  std::ofstream f_service_;

};

/**

 * Prepares for file generation by opening up the necessary file output

 * streams.

 *

 * @param tprogram The program to generate

 */

void t_perl_generator::init_generator() {

  // Make output directory

  MKDIR(get_out_dir().c_str());

  string outdir = get_out_dir();

  std::list<std::string> dirs;

  perl_namespace_dirs(program_, dirs);

  std::list<std::string>::iterator it;

  for (it = dirs.begin(); it != dirs.end(); it++) {

      outdir += *it + "/";

      MKDIR(outdir.c_str());

  }

  // Make output file

  string f_types_name = outdir+"Types.pm";

  f_types_.open(f_types_name.c_str());

  string f_consts_name = outdir+"Constants.pm";

  f_consts_.open(f_consts_name.c_str());

  // Print header

  f_types_ <<

    autogen_comment() <<

    perl_includes();

  // Print header

  f_consts_ <<

    autogen_comment() <<

    "package "<< perl_namespace(program_) <<"Constants;"<<endl<<

    perl_includes() <<

    endl;

}

/**

 * Prints standard java imports

 */

string t_perl_generator::perl_includes() {

  string inc;

  inc  = "require 5.6.0;\n";

  inc += "use strict;\n";

  inc += "use warnings;\n";

  inc += "use Thrift;\n\n";

  return inc;

}

/**

 * Close up (or down) some filez.

 */

void t_perl_generator::close_generator() {

  // Close types file

  f_types_ << "1;" << endl;

  f_types_.close();

  f_consts_ << "1;" << endl;

  f_consts_.close();

}

/**

 * Generates a typedef. This is not done in PERL, types are all implicit.

 *

 * @param ttypedef The type definition

 */

void t_perl_generator::generate_typedef(t_typedef* ttypedef) {}

/**

 * Generates code for an enumerated type. Since define is expensive to lookup

 * in PERL, we use a global array for this.

 *

 * @param tenum The enumeration

 */

void t_perl_generator::generate_enum(t_enum* tenum) {

  f_types_ << "package " << perl_namespace(program_) <<tenum->get_name()<<";"<<endl;

  vector<t_enum_value*> constants = tenum->get_constants();

  vector<t_enum_value*>::iterator c_iter;

  int value = -1;

  for (c_iter = constants.begin(); c_iter != constants.end(); ++c_iter) {

    if ((*c_iter)->has_value()) {

      value = (*c_iter)->get_value();

    } else {

      ++value;

    }

    f_types_ << "use constant "<<(*c_iter)->get_name() << " => " << value << ";" << endl;

  }

}

/**

 * Generate a constant value

 */

void t_perl_generator::generate_const(t_const* tconst) {

  t_type* type = tconst->get_type();

  string name = tconst->get_name();

  t_const_value* value = tconst->get_value();

  f_consts_ << "use constant " << name << " => ";

  f_consts_ << render_const_value(type, value);

  f_consts_ << ";" << endl << endl;

}

/**

 * Prints the value of a constant with the given type. Note that type checking

 * is NOT performed in this function as it is always run beforehand using the

 * validate_types method in main.cc

 */

string t_perl_generator::render_const_value(t_type* type, t_const_value* value) {

  std::ostringstream out;

  type = get_true_type(type);

  if (type->is_base_type()) {

    t_base_type::t_base tbase = ((t_base_type*)type)->get_base();

    switch (tbase) {

    case t_base_type::TYPE_STRING:

      out << '"' << get_escaped_string(value) << '"';

      break;

    case t_base_type::TYPE_BOOL:

      out << (value->get_integer() > 0 ? "1" : "0");

      break;

    case t_base_type::TYPE_BYTE:

    case t_base_type::TYPE_I16:

    case t_base_type::TYPE_I32:

    case t_base_type::TYPE_I64:

      out << value->get_integer();

      break;

    case t_base_type::TYPE_DOUBLE:

      if (value->get_type() == t_const_value::CV_INTEGER) {

        out << value->get_integer();

      } else {

        out << value->get_double();

      }

      break;

    default:

      throw "compiler error: no const of base type " + t_base_type::t_base_name(tbase);

    }

  } else if (type->is_enum()) {

    out << value->get_integer();

  } else if (type->is_struct() || type->is_xception()) {

    out << "new " << perl_namespace(type->get_program()) << type->get_name() << "({" << endl;

    indent_up();

    const vector<t_field*>& fields = ((t_struct*)type)->get_members();

    vector<t_field*>::const_iterator f_iter;

    const map<t_const_value*, t_const_value*>& val = value->get_map();

    map<t_const_value*, t_const_value*>::const_iterator v_iter;

    for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {

      t_type* field_type = NULL;

      for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {

        if ((*f_iter)->get_name() == v_iter->first->get_string()) {

          field_type = (*f_iter)->get_type();

        }

      }

      if (field_type == NULL) {

        throw "type error: " + type->get_name() + " has no field " + v_iter->first->get_string();

      }

      out << render_const_value(g_type_string, v_iter->first);

      out << " => ";

      out << render_const_value(field_type, v_iter->second);

      out << ",";

      out << endl;

    }

    out << "})";

  } else if (type->is_map()) {

    t_type* ktype = ((t_map*)type)->get_key_type();

    t_type* vtype = ((t_map*)type)->get_val_type();

    out << "{" << endl;

    const map<t_const_value*, t_const_value*>& val = value->get_map();

    map<t_const_value*, t_const_value*>::const_iterator v_iter;

    for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {

      out << render_const_value(ktype, v_iter->first);

      out << " => ";

      out << render_const_value(vtype, v_iter->second);

      out << "," << endl;

    }

    out << "}";

  } else if (type->is_list() || type->is_set()) {

    t_type* etype;

    if (type->is_list()) {

      etype = ((t_list*)type)->get_elem_type();

    } else {

      etype = ((t_set*)type)->get_elem_type();

    }

    out << "[" << endl;

    const vector<t_const_value*>& val = value->get_list();

    vector<t_const_value*>::const_iterator v_iter;

    for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {

      out << render_const_value(etype, *v_iter);

      if (type->is_set()) {

        out << " => 1";

      }

      out << "," << endl;

    }

    out << "]";

  }

  return out.str();

}

/**

 * Make a struct

 */

void t_perl_generator::generate_struct(t_struct* tstruct) {

  generate_perl_struct(tstruct, false);

}

/**

 * Generates a struct definition for a thrift exception. Basically the same

 * as a struct but extends the Exception class.

 *

 * @param txception The struct definition

 */

void t_perl_generator::generate_xception(t_struct* txception) {

  generate_perl_struct(txception, true);

}

/**

 * Structs can be normal or exceptions.

 */

void t_perl_generator::generate_perl_struct(t_struct* tstruct,

                                            bool is_exception) {

  generate_perl_struct_definition(f_types_, tstruct, is_exception);

}

/**

 * Generates a struct definition for a thrift data type. This is nothing in PERL

 * where the objects are all just associative arrays (unless of course we

 * decide to start using objects for them...)

 *

 * @param tstruct The struct definition

 */

void t_perl_generator::generate_perl_struct_definition(ofstream& out,

                                                       t_struct* tstruct,

                                                       bool is_exception) {

  const vector<t_field*>& members = tstruct->get_members();

  vector<t_field*>::const_iterator m_iter;

  out <<

      "package " << perl_namespace(tstruct->get_program()) << tstruct->get_name() <<";\n";

  if (is_exception) {

    out << "use base qw(Thrift::TException);\n";

  }

  //Create simple acessor methods

  out << "use base qw(Class::Accessor);\n";

  if (members.size() > 0) {

      out << perl_namespace(tstruct->get_program()) << tstruct->get_name() <<"->mk_accessors( qw( ";

      for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {

          t_type* t = get_true_type((*m_iter)->get_type());

          if (!t->is_xception()) {

              out << (*m_iter)->get_name() << " ";

          }

      }

      out << ") );\n";

  }

  out << endl;

  // new()

  indent_up();

  out <<

    "sub new {" << endl <<

    indent() << "my $classname = shift;" << endl <<

    indent() << "my $self      = {};" << endl <<

    indent() << "my $vals      = shift || {};" << endl;

  for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {

    string dval = "undef";

    t_type* t = get_true_type((*m_iter)->get_type());

    if ((*m_iter)->get_value() != NULL && !(t->is_struct() || t->is_xception())) {

      dval = render_const_value((*m_iter)->get_type(), (*m_iter)->get_value());

    }

    out <<

      indent() << "$self->{" << (*m_iter)->get_name() << "} = " << dval << ";" << endl;

  }

  // Generate constructor from array

  if (members.size() > 0) {

    for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {

      t_type* t = get_true_type((*m_iter)->get_type());

      if ((*m_iter)->get_value() != NULL && (t->is_struct() || t->is_xception())) {

        indent(out) << "$self->{" << (*m_iter)->get_name() << "} = " << render_const_value(t, (*m_iter)->get_value()) << ";" << endl;

      }

    }

    out << indent() << "if (UNIVERSAL::isa($vals,'HASH')) {" << endl;

    indent_up();

    for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {

      out <<

        indent() << "if (defined $vals->{" << (*m_iter)->get_name() << "}) {" << endl <<

        indent() << "  $self->{" << (*m_iter)->get_name() << "} = $vals->{" << (*m_iter)->get_name() << "};" << endl <<

        indent() << "}" << endl;

    }

    indent_down();

    out <<

      indent() << "}" << endl;

  }

  out << indent() << "return bless ($self, $classname);" << endl;

  indent_down();

  out << "}\n\n";

  out <<

    "sub getName {" << endl <<

    indent() << "  return '" << tstruct->get_name() << "';" << endl <<

    indent() << "}" << endl <<

    endl;

  generate_perl_struct_reader(out, tstruct);

  generate_perl_struct_writer(out, tstruct);

}

/**

 * Generates the read() method for a struct

 */

void t_perl_generator::generate_perl_struct_reader(ofstream& out,

                                                   t_struct* tstruct) {

  const vector<t_field*>& fields = tstruct->get_members();

  vector<t_field*>::const_iterator f_iter;

  out << "sub read {" <<endl;

  indent_up();

  out <<

    indent() << "my ($self, $input) = @_;" << endl <<

    indent() << "my $xfer  = 0;" << endl <<

    indent() << "my $fname;"     << endl <<

    indent() << "my $ftype = 0;" << endl <<

    indent() << "my $fid   = 0;" << endl;

  indent(out) << "$xfer += $input->readStructBegin(\\$fname);" << endl;

  // Loop over reading in fields

  indent(out) << "while (1) " << endl;

  scope_up(out);

  indent(out) << "$xfer += $input->readFieldBegin(\\$fname, \\$ftype, \\$fid);" << endl;

  // Check for field STOP marker and break

  indent(out) << "if ($ftype == TType::STOP) {" << endl;

  indent_up();

  indent(out) << "last;" << endl;

  indent_down();

  indent(out) << "}" << endl;

  // Switch statement on the field we are reading

  indent(out) << "SWITCH: for($fid)" << endl;

  scope_up(out);

  // Generate deserialization code for known cases

  for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {

    indent(out) << "/^" << (*f_iter)->get_key() << "$/ && do{";

    indent(out) << "if ($ftype == " << type_to_enum((*f_iter)->get_type()) << ") {" << endl;

    indent_up();

    generate_deserialize_field(out, *f_iter, "self->");

    indent_down();

    indent(out) << "} else {" << endl;

    indent(out) <<  "  $xfer += $input->skip($ftype);" << endl;

    out <<

      indent() << "}" << endl <<

      indent() << "last; };" << endl;

  }

  // In the default case we skip the field

  indent(out) <<  "  $xfer += $input->skip($ftype);" << endl;

  scope_down(out);

  indent(out) << "$xfer += $input->readFieldEnd();" << endl;

  scope_down(out);

  indent(out) << "$xfer += $input->readStructEnd();" << endl;

  indent(out) << "return $xfer;" << endl;

  indent_down();

  out << indent() << "}" << endl << endl;

}

/**

 * Generates the write() method for a struct

 */

void t_perl_generator::generate_perl_struct_writer(ofstream& out,

                                                   t_struct* tstruct) {

  string name = tstruct->get_name();

  const vector<t_field*>& fields = tstruct->get_sorted_members();

  vector<t_field*>::const_iterator f_iter;

  out << "sub write {" << endl;

  indent_up();

  indent(out) << "my ($self, $output) = @_;" << endl;

  indent(out) << "my $xfer   = 0;" << endl;

  indent(out) << "$xfer += $output->writeStructBegin('" << name << "');" << endl;

  for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {

    out << indent() << "if (defined $self->{" << (*f_iter)->get_name() << "}) {" << endl;

    indent_up();

    indent(out) <<

      "$xfer += $output->writeFieldBegin(" <<

      "'" << (*f_iter)->get_name() << "', " <<

      type_to_enum((*f_iter)->get_type()) << ", " <<

      (*f_iter)->get_key() << ");" << endl;

    // Write field contents

    generate_serialize_field(out, *f_iter, "self->");

    indent(out) <<

        "$xfer += $output->writeFieldEnd();" << endl;

    indent_down();

    indent(out) << "}" << endl;

  }

  out <<

    indent() << "$xfer += $output->writeFieldStop();" << endl <<

    indent() << "$xfer += $output->writeStructEnd();" << endl;

  out <<indent() << "return $xfer;" << endl;

  indent_down();

  out <<

    indent() << "}" << endl <<

    endl;

}

/**

 * Generates a thrift service.

 *

 * @param tservice The service definition

 */

void t_perl_generator::generate_service(t_service* tservice) {

  string f_service_name = get_namespace_out_dir()+service_name_+".pm";

  f_service_.open(f_service_name.c_str());

  f_service_ <<

    ///      "package "<<service_name_<<";"<<endl<<

    autogen_comment() <<

    perl_includes();

  f_service_ <<

    "use " << perl_namespace(tservice->get_program()) << "Types;" << endl;

  t_service* extends_s = tservice->get_extends();

  if (extends_s != NULL) {

    f_service_ <<

      "use " << perl_namespace(extends_s->get_program()) << extends_s->get_name() << ";" << endl;

  }

  f_service_ <<

    endl;

  // Generate the three main parts of the service (well, two for now in PERL)

  generate_service_helpers(tservice);

  generate_service_interface(tservice);

  generate_service_rest(tservice);

  generate_service_client(tservice);

  generate_service_processor(tservice);

  // Close service file

  f_service_ << "1;" << endl;

  f_service_.close();

}

/**

 * Generates a service server definition.

 *

 * @param tservice The service to generate a server for.

 */

void t_perl_generator::generate_service_processor(t_service* tservice) {

  // Generate the dispatch methods

  vector<t_function*> functions = tservice->get_functions();

  vector<t_function*>::iterator f_iter;

  string extends = "";

  string extends_processor = "";

  t_service* extends_s = tservice->get_extends();

  if (extends_s != NULL) {

    extends = perl_namespace(extends_s->get_program()) + extends_s->get_name();

    extends_processor = "use base qw(" + extends + "Processor);";

  }

  indent_up();

  // Generate the header portion

  f_service_ <<

    "package " << perl_namespace(program_) << service_name_ << "Processor;" << endl << endl <<

    "use strict;" << endl <<

    extends_processor << endl << endl;

  if (extends.empty()) {

    f_service_ << "sub new {" << endl;

    indent_up();

    f_service_ <<

      indent() << "my ($classname, $handler) = @_;"<< endl <<

      indent() << "my $self      = {};"   << endl;

    f_service_ <<

      indent() << "$self->{handler} = $handler;" << endl;

    f_service_ <<

      indent() << "return bless ($self, $classname);"<<endl;

    indent_down();

    f_service_ <<

      "}" << endl << endl;

  }

  // Generate the server implementation

  f_service_ << "sub process {" << endl;

  indent_up();

  f_service_ <<

    indent() << "my ($self, $input, $output) = @_;" << endl;

  f_service_ <<

    indent() << "my $rseqid = 0;" << endl <<

    indent() << "my $fname  = undef;" << endl <<

    indent() << "my $mtype  = 0;" << endl << endl;

  f_service_ <<

    indent() << "$input->readMessageBegin(\\$fname, \\$mtype, \\$rseqid);" << endl;

  // HOT: check for method implementation

  f_service_ <<

    indent() << "my $methodname = 'process_'.$fname;" << endl <<

    indent() << "if (!$self->can($methodname)) {" << endl;

  indent_up();

  f_service_ <<

    indent() << "$input->skip(TType::STRUCT);" << endl <<

    indent() << "$input->readMessageEnd();" << endl <<

    indent() << "my $x = new TApplicationException('Function '.$fname.' not implemented.', TApplicationException::UNKNOWN_METHOD);" << endl <<

    indent() << "$output->writeMessageBegin($fname, TMessageType::EXCEPTION, $rseqid);" << endl <<

    indent() << "$x->write($output);" << endl <<

    indent() << "$output->writeMessageEnd();" << endl <<

    indent() << "$output->getTransport()->flush();" << endl <<

    indent() << "return;" << endl;

  indent_down();

  f_service_ <<

    indent() << "}" << endl <<

    indent() << "$self->$methodname($rseqid, $input, $output);" << endl <<

    indent() << "return 1;" << endl;

  indent_down();

  f_service_ <<

    "}" << endl <<endl;

  // Generate the process subfunctions

  for (f_iter = functions.begin(); f_iter != functions.end(); ++f_iter) {

    generate_process_function(tservice, *f_iter);

  }

}

/**

 * Generates a process function definition.

 *

 * @param tfunction The function to write a dispatcher for

 */

void t_perl_generator::generate_process_function(t_service* tservice,

                                                 t_function* tfunction) {

  // Open function

  f_service_ <<

    "sub process_" << tfunction->get_name() << " {"<<endl;

  indent_up();

  f_service_ <<

    indent() << "my ($self, $seqid, $input, $output) = @_;" << endl;

  string argsname = perl_namespace(tservice->get_program()) + service_name_ + "_" + tfunction->get_name() + "_args";

  string resultname = perl_namespace(tservice->get_program()) + service_name_ + "_" + tfunction->get_name() + "_result";

  f_service_ <<

    indent() << "my $args = new " << argsname << "();" << endl <<

    indent() << "$args->read($input);" << endl;

  f_service_ <<

    indent() << "$input->readMessageEnd();" << endl;

  t_struct* xs = tfunction->get_xceptions();

  const std::vector<t_field*>& xceptions = xs->get_members();

  vector<t_field*>::const_iterator x_iter;

  // Declare result for non oneway function

  if (!tfunction->is_oneway()) {

    f_service_ <<

      indent() << "my $result = new " << resultname << "();" << endl;

  }

  // Try block for a function with exceptions

  if (xceptions.size() > 0) {

    f_service_ <<

      indent() << "eval {" << endl;

    indent_up();

  }

  // Generate the function call

  t_struct* arg_struct = tfunction->get_arglist();

  const std::vector<t_field*>& fields = arg_struct->get_members();

  vector<t_field*>::const_iterator f_iter;

  f_service_ << indent();

  if (!tfunction->is_oneway() && !tfunction->get_returntype()->is_void()) {

    f_service_ << "$result->{success} = ";

  }

  f_service_ <<

    "$self->{handler}->" << tfunction->get_name() << "(";

  bool first = true;

  for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {

    if (first) {

      first = false;

    } else {

      f_service_ << ", ";

    }

    f_service_ << "$args->" << (*f_iter)->get_name();

  }

  f_service_ << ");" << endl;

  if (!tfunction->is_oneway() && xceptions.size() > 0) {

    indent_down();

    for (x_iter = xceptions.begin(); x_iter != xceptions.end(); ++x_iter) {

      f_service_ <<

        indent() << "}; if( UNIVERSAL::isa($@,'" <<

          perl_namespace((*x_iter)->get_type()->get_program()) <<

          (*x_iter)->get_type()->get_name() <<

          "') ){ " << endl;

      if (!tfunction->is_oneway()) {

        indent_up();

        f_service_ <<

          indent() << "$result->{" << (*x_iter)->get_name() << "} = $@;" << endl;

        indent_down();

        f_service_ << indent();

      }

    }

    f_service_ << "}" << endl;

  }

  // Shortcut out here for oneway functions

  if (tfunction->is_oneway()) {

    f_service_ <<

      indent() << "return;" << endl;

    indent_down();

    f_service_ <<

      "}" << endl;

    return;

  }

  // Serialize the request header

  f_service_ <<

    indent() << "$output->writeMessageBegin('" << tfunction->get_name() << "', TMessageType::REPLY, $seqid);" << endl <<

    indent() << "$result->write($output);" << endl <<

    indent() << "$output->writeMessageEnd();" << endl <<

    indent() << "$output->getTransport()->flush();" << endl;

  // Close function

  indent_down();

  f_service_ <<

    "}" << endl << endl;

}

/**

 * Generates helper functions for a service.

 *

 * @param tservice The service to generate a header definition for

 */

void t_perl_generator::generate_service_helpers(t_service* tservice) {

  vector<t_function*> functions = tservice->get_functions();

  vector<t_function*>::iterator f_iter;

  f_service_ <<

    "# HELPER FUNCTIONS AND STRUCTURES" << endl << endl;

  for (f_iter = functions.begin(); f_iter != functions.end(); ++f_iter) {

    t_struct* ts = (*f_iter)->get_arglist();

    string name = ts->get_name();

    ts->set_name(service_name_ + "_" + name);

    generate_perl_struct_definition(f_service_, ts, false);

    generate_perl_function_helpers(*f_iter);

    ts->set_name(name);

  }

}

/**

 * Generates a struct and helpers for a function.

 *

 * @param tfunction The function

 */

void t_perl_generator::generate_perl_function_helpers(t_function* tfunction) {

  t_struct result(program_, service_name_ + "_" + tfunction->get_name() + "_result");

  t_field success(tfunction->get_returntype(), "success", 0);

  if (!tfunction->get_returntype()->is_void()) {

    result.append(&success);

  }

  t_struct* xs = tfunction->get_xceptions();

  const vector<t_field*>& fields = xs->get_members();

  vector<t_field*>::const_iterator f_iter;

  for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {

    result.append(*f_iter);

  }

  generate_perl_struct_definition(f_service_, &result, false);

}

/**

 * Generates a service interface definition.

 *

 * @param tservice The service to generate a header definition for

 */

void t_perl_generator::generate_service_interface(t_service* tservice) {

  string extends_if = "";

  t_service* extends_s = tservice->get_extends();

  if (extends_s != NULL) {

    extends_if = "use base qw(" + perl_namespace(extends_s->get_program()) + extends_s->get_name() + "If);";

  }

  f_service_ <<

    "package " << perl_namespace(program_) << service_name_ << "If;" << endl << endl <<

    "use strict;" << endl <<

    extends_if << endl << endl;

  indent_up();

  vector<t_function*> functions = tservice->get_functions();

  vector<t_function*>::iterator f_iter;

  for (f_iter = functions.begin(); f_iter != functions.end(); ++f_iter) {

    f_service_ <<

      "sub " << function_signature(*f_iter) <<endl<< "  die 'implement interface';\n}" << endl << endl;

  }

  indent_down();

}

/**

 * Generates a REST interface

 */

void t_perl_generator::generate_service_rest(t_service* tservice) {

  string extends = "";

  string extends_if = "";

  t_service* extends_s = tservice->get_extends();

  if (extends_s != NULL) {

    extends    =  extends_s->get_name();

    extends_if = "use base qw(" + perl_namespace(extends_s->get_program()) + extends_s->get_name() + "Rest);";

  }

  f_service_ <<

    "package " << perl_namespace(program_) << service_name_ << "Rest;" << endl << endl <<

    "use strict;" << endl <<

    extends_if << endl << endl;

  if (extends.empty()) {

    f_service_ << "sub new {" << endl;