tools/nfdc/command-definition.cpp - NFD - Gitiles

 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
  * Copyright (c) 2014-2017,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
  *                           Washington University in St. Louis,
  *                           Beijing Institute of Technology,
  *                           The University of Memphis.
  *
  * This file is part of NFD (Named Data Networking Forwarding Daemon).
  * See AUTHORS.md for complete list of NFD authors and contributors.
  *
  * NFD is free software: you can redistribute it and/or modify it under the terms
  * of the GNU General Public License as published by the Free Software Foundation,
  * either version 3 of the License, or (at your option) any later version.
  *
  * NFD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
  * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  * PURPOSE.  See the GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License along with
  * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
  */

 #include "command-definition.hpp"
 #include <ndn-cxx/util/logger.hpp>

 namespace nfd {
 namespace tools {
 namespace nfdc {

 NDN_LOG_INIT(nfdc.CommandDefinition);

 std::ostream&
 operator<<(std::ostream& os, ArgValueType vt)
 {
   switch (vt) {
     case ArgValueType::NONE:
       return os << "none";
     case ArgValueType::ANY:
       return os << "any";
     case ArgValueType::UNSIGNED:
       return os << "non-negative integer";
     case ArgValueType::STRING:
       return os << "string";
     case ArgValueType::REPORT_FORMAT:
       return os << "ReportFormat";
     case ArgValueType::NAME:
       return os << "Name";
     case ArgValueType::FACE_URI:
       return os << "FaceUri";
     case ArgValueType::FACE_ID_OR_URI:
       return os << "FaceId or FaceUri";
     case ArgValueType::FACE_PERSISTENCY:
       return os << "FacePersistency";
     case ArgValueType::ROUTE_ORIGIN:
       return os << "RouteOrigin";
   }
   return os << static_cast<int>(vt);
 }

 static std::string
 getMetavarFromType(ArgValueType vt)
 {
   switch (vt) {
     case ArgValueType::NONE:
       return "";
     case ArgValueType::ANY:
       return "args";
     case ArgValueType::UNSIGNED:
       return "uint";
     case ArgValueType::STRING:
       return "str";
     case ArgValueType::REPORT_FORMAT:
       return "fmt";
     case ArgValueType::NAME:
       return "name";
     case ArgValueType::FACE_URI:
       return "uri";
     case ArgValueType::FACE_ID_OR_URI:
       return "face";
     case ArgValueType::FACE_PERSISTENCY:
       return "persistency";
     case ArgValueType::ROUTE_ORIGIN:
       return "origin";
   }
   BOOST_ASSERT(false);
   return "";
 }

 CommandDefinition::CommandDefinition(const std::string& noun, const std::string& verb)
   : m_noun(noun)
   , m_verb(verb)
 {
 }

 CommandDefinition::~CommandDefinition() = default;

 CommandDefinition&
 CommandDefinition::addArg(const std::string& name, ArgValueType valueType,
                         Required isRequired, Positional allowPositional,
                         const std::string& metavar)
 {
   bool isNew = m_args.emplace(name,
     Arg{name, valueType, static_cast<bool>(isRequired),
         metavar.empty() ? getMetavarFromType(valueType) : metavar}).second;
   BOOST_VERIFY(isNew);

   if (static_cast<bool>(isRequired)) {
     m_requiredArgs.insert(name);
   }

   if (static_cast<bool>(allowPositional)) {
     BOOST_ASSERT(valueType != ArgValueType::NONE);
     m_positionalArgs.push_back(name);
   }
   else {
     BOOST_ASSERT(valueType != ArgValueType::ANY);
   }

   return *this;
 }

 CommandArguments
 CommandDefinition::parse(const std::vector<std::string>& tokens, size_t start) const
 {
   CommandArguments ca;

   size_t positionalArgIndex = 0;
   for (size_t i = start; i < tokens.size(); ++i) {
     const std::string& token = tokens[i];

     // try to parse as named argument
     auto namedArg = m_args.find(token);
     if (namedArg != m_args.end() && namedArg->second.valueType != ArgValueType::ANY) {
       NDN_LOG_TRACE(token << " is a named argument");
       const Arg& arg = namedArg->second;
       if (arg.valueType == ArgValueType::NONE) {
         ca[arg.name] = true;
         NDN_LOG_TRACE(token << " is a boolean argument");
       }
       else if (i + 1 >= tokens.size()) {
         BOOST_THROW_EXCEPTION(Error(arg.name + ": " + arg.metavar + " is missing"));
       }
       else {
         const std::string& valueToken = tokens[++i];
         NDN_LOG_TRACE(arg.name << " has value " << valueToken);
         try {
           ca[arg.name] = this->parseValue(arg.valueType, valueToken);
         }
         catch (const std::exception& e) {
           NDN_LOG_TRACE(valueToken << " cannot be parsed as " << arg.valueType);
           BOOST_THROW_EXCEPTION(Error(arg.name + ": cannot parse '" + valueToken + "' as " +
                                       arg.metavar + " (" + e.what() + ")"));
         }
         NDN_LOG_TRACE(valueToken << " is parsed as " << arg.valueType);
       }

       // disallow positional arguments after named argument
       positionalArgIndex = m_positionalArgs.size();
       continue;
     }

     // try to parse as positional argument
     for (; positionalArgIndex < m_positionalArgs.size(); ++positionalArgIndex) {
       const Arg& arg = m_args.at(m_positionalArgs[positionalArgIndex]);

       if (arg.valueType == ArgValueType::ANY) {
         std::vector<std::string> values;
         std::copy(tokens.begin() + i, tokens.end(), std::back_inserter(values));
         ca[arg.name] = values;
         NDN_LOG_TRACE((tokens.size() - i) << " tokens are consumed for " << arg.name);
         i = tokens.size();
         break;
       }

       try {
         ca[arg.name] = this->parseValue(arg.valueType, token);
         NDN_LOG_TRACE(token << " is parsed as value for " << arg.name);
         break;
       }
       catch (const std::exception& e) {
         if (arg.isRequired) { // the current token must be parsed as the value for arg
           NDN_LOG_TRACE(token << " cannot be parsed as value for " << arg.name);
           BOOST_THROW_EXCEPTION(Error("cannot parse '" + token + "' as an argument name or as " +
                                       arg.metavar + " for " + arg.name + " (" + e.what() + ")"));
         }
         else {
           // the current token may be a value for next positional argument
           NDN_LOG_TRACE(token << " cannot be parsed as value for " << arg.name);
         }
       }
     }

     if (positionalArgIndex >= m_positionalArgs.size()) {
       // for loop has reached the end without finding a match,
       // which means token is not accepted as a value for positional argument
       BOOST_THROW_EXCEPTION(Error("cannot parse '" + token + "' as an argument name"));
     }

     // token is accepted; don't parse as the same positional argument again
     ++positionalArgIndex;
   }

   for (const std::string& argName : m_requiredArgs) {
     if (ca.count(argName) == 0) {
       BOOST_THROW_EXCEPTION(Error(argName + ": required argument is missing"));
     }
   }

   return ca;
 }

 static FacePersistency
 parseFacePersistency(const std::string& s)
 {
   if (s == "persistent") {
     return FacePersistency::FACE_PERSISTENCY_PERSISTENT;
   }
   if (s == "permanent") {
     return FacePersistency::FACE_PERSISTENCY_PERMANENT;
   }
   BOOST_THROW_EXCEPTION(std::invalid_argument("unrecognized FacePersistency"));
 }

 boost::any
 CommandDefinition::parseValue(ArgValueType valueType, const std::string& token) const
 {
   switch (valueType) {
     case ArgValueType::NONE:
     case ArgValueType::ANY:
       BOOST_ASSERT(false);
       return boost::any();

     case ArgValueType::UNSIGNED: {
       // boost::lexical_cast<uint64_t> will accept negative number
       int64_t v = boost::lexical_cast<int64_t>(token);
       if (v < 0) {
         BOOST_THROW_EXCEPTION(std::out_of_range("value is negative"));
       }
       return static_cast<uint64_t>(v);
     }

     case ArgValueType::STRING:
       return token;

     case ArgValueType::REPORT_FORMAT:
       return parseReportFormat(token);

     case ArgValueType::NAME:
       return Name(token);

     case ArgValueType::FACE_URI:
       return FaceUri(token);

     case ArgValueType::FACE_ID_OR_URI:
       try {
         return boost::lexical_cast<uint64_t>(token);
       }
       catch (const boost::bad_lexical_cast&) {
         return FaceUri(token);
       }

     case ArgValueType::FACE_PERSISTENCY:
       return parseFacePersistency(token);

     case ArgValueType::ROUTE_ORIGIN:
       return boost::lexical_cast<RouteOrigin>(token);
   }

   BOOST_ASSERT(false);
   return boost::any();
 }

 } // namespace nfdc
 } // namespace tools
 } // namespace nfd
	/* -- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -- */
	/**
	* Copyright (c) 2014-2017, Regents of the University of California,
	* Arizona Board of Regents,
	* Colorado State University,
	* University Pierre & Marie Curie, Sorbonne University,
	* Washington University in St. Louis,
	* Beijing Institute of Technology,
	* The University of Memphis.
	*
	* This file is part of NFD (Named Data Networking Forwarding Daemon).
	* See AUTHORS.md for complete list of NFD authors and contributors.
	*
	* NFD is free software: you can redistribute it and/or modify it under the terms
	* of the GNU General Public License as published by the Free Software Foundation,
	* either version 3 of the License, or (at your option) any later version.
	*
	* NFD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
	* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
	* PURPOSE. See the GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License along with
	* NFD, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
	*/

	#include "command-definition.hpp"
	#include <ndn-cxx/util/logger.hpp>

	namespace nfd {
	namespace tools {
	namespace nfdc {

	NDN_LOG_INIT(nfdc.CommandDefinition);

	std::ostream&
	operator<<(std::ostream& os, ArgValueType vt)
	{
	switch (vt) {
	case ArgValueType::NONE:
	return os << "none";
	case ArgValueType::ANY:
	return os << "any";
	case ArgValueType::UNSIGNED:
	return os << "non-negative integer";
	case ArgValueType::STRING:
	return os << "string";
	case ArgValueType::REPORT_FORMAT:
	return os << "ReportFormat";
	case ArgValueType::NAME:
	return os << "Name";
	case ArgValueType::FACE_URI:
	return os << "FaceUri";
	case ArgValueType::FACE_ID_OR_URI:
	return os << "FaceId or FaceUri";
	case ArgValueType::FACE_PERSISTENCY:
	return os << "FacePersistency";
	case ArgValueType::ROUTE_ORIGIN:
	return os << "RouteOrigin";
	}
	return os << static_cast<int>(vt);
	}

	static std::string
	getMetavarFromType(ArgValueType vt)
	{
	switch (vt) {
	case ArgValueType::NONE:
	return "";
	case ArgValueType::ANY:
	return "args";
	case ArgValueType::UNSIGNED:
	return "uint";
	case ArgValueType::STRING:
	return "str";
	case ArgValueType::REPORT_FORMAT:
	return "fmt";
	case ArgValueType::NAME:
	return "name";
	case ArgValueType::FACE_URI:
	return "uri";
	case ArgValueType::FACE_ID_OR_URI:
	return "face";
	case ArgValueType::FACE_PERSISTENCY:
	return "persistency";
	case ArgValueType::ROUTE_ORIGIN:
	return "origin";
	}
	BOOST_ASSERT(false);
	return "";
	}

	CommandDefinition::CommandDefinition(const std::string& noun, const std::string& verb)
	: m_noun(noun)
	, m_verb(verb)
	{
	}

	CommandDefinition::~CommandDefinition() = default;

	CommandDefinition&
	CommandDefinition::addArg(const std::string& name, ArgValueType valueType,
	Required isRequired, Positional allowPositional,
	const std::string& metavar)
	{
	bool isNew = m_args.emplace(name,
	Arg{name, valueType, static_cast<bool>(isRequired),
	metavar.empty() ? getMetavarFromType(valueType) : metavar}).second;
	BOOST_VERIFY(isNew);

	if (static_cast<bool>(isRequired)) {
	m_requiredArgs.insert(name);
	}

	if (static_cast<bool>(allowPositional)) {
	BOOST_ASSERT(valueType != ArgValueType::NONE);
	m_positionalArgs.push_back(name);
	}
	else {
	BOOST_ASSERT(valueType != ArgValueType::ANY);
	}

	return *this;
	}

	CommandArguments
	CommandDefinition::parse(const std::vector<std::string>& tokens, size_t start) const
	{
	CommandArguments ca;

	size_t positionalArgIndex = 0;
	for (size_t i = start; i < tokens.size(); ++i) {
	const std::string& token = tokens[i];

	// try to parse as named argument
	auto namedArg = m_args.find(token);
	if (namedArg != m_args.end() && namedArg->second.valueType != ArgValueType::ANY) {
	NDN_LOG_TRACE(token << " is a named argument");
	const Arg& arg = namedArg->second;
	if (arg.valueType == ArgValueType::NONE) {
	ca[arg.name] = true;
	NDN_LOG_TRACE(token << " is a boolean argument");
	}
	else if (i + 1 >= tokens.size()) {
	BOOST_THROW_EXCEPTION(Error(arg.name + ": " + arg.metavar + " is missing"));
	}
	else {
	const std::string& valueToken = tokens[++i];
	NDN_LOG_TRACE(arg.name << " has value " << valueToken);
	try {
	ca[arg.name] = this->parseValue(arg.valueType, valueToken);
	}
	catch (const std::exception& e) {
	NDN_LOG_TRACE(valueToken << " cannot be parsed as " << arg.valueType);
	BOOST_THROW_EXCEPTION(Error(arg.name + ": cannot parse '" + valueToken + "' as " +
	arg.metavar + " (" + e.what() + ")"));
	}
	NDN_LOG_TRACE(valueToken << " is parsed as " << arg.valueType);
	}

	// disallow positional arguments after named argument
	positionalArgIndex = m_positionalArgs.size();
	continue;
	}

	// try to parse as positional argument
	for (; positionalArgIndex < m_positionalArgs.size(); ++positionalArgIndex) {
	const Arg& arg = m_args.at(m_positionalArgs[positionalArgIndex]);

	if (arg.valueType == ArgValueType::ANY) {
	std::vector<std::string> values;
	std::copy(tokens.begin() + i, tokens.end(), std::back_inserter(values));
	ca[arg.name] = values;
	NDN_LOG_TRACE((tokens.size() - i) << " tokens are consumed for " << arg.name);
	i = tokens.size();
	break;
	}

	try {
	ca[arg.name] = this->parseValue(arg.valueType, token);
	NDN_LOG_TRACE(token << " is parsed as value for " << arg.name);
	break;
	}
	catch (const std::exception& e) {
	if (arg.isRequired) { // the current token must be parsed as the value for arg
	NDN_LOG_TRACE(token << " cannot be parsed as value for " << arg.name);
	BOOST_THROW_EXCEPTION(Error("cannot parse '" + token + "' as an argument name or as " +
	arg.metavar + " for " + arg.name + " (" + e.what() + ")"));
	}
	else {
	// the current token may be a value for next positional argument
	NDN_LOG_TRACE(token << " cannot be parsed as value for " << arg.name);
	}
	}
	}

	if (positionalArgIndex >= m_positionalArgs.size()) {
	// for loop has reached the end without finding a match,
	// which means token is not accepted as a value for positional argument
	BOOST_THROW_EXCEPTION(Error("cannot parse '" + token + "' as an argument name"));
	}

	// token is accepted; don't parse as the same positional argument again
	++positionalArgIndex;
	}

	for (const std::string& argName : m_requiredArgs) {
	if (ca.count(argName) == 0) {
	BOOST_THROW_EXCEPTION(Error(argName + ": required argument is missing"));
	}
	}

	return ca;
	}

	static FacePersistency
	parseFacePersistency(const std::string& s)
	{
	if (s == "persistent") {
	return FacePersistency::FACE_PERSISTENCY_PERSISTENT;
	}
	if (s == "permanent") {
	return FacePersistency::FACE_PERSISTENCY_PERMANENT;
	}
	BOOST_THROW_EXCEPTION(std::invalid_argument("unrecognized FacePersistency"));
	}

	boost::any
	CommandDefinition::parseValue(ArgValueType valueType, const std::string& token) const
	{
	switch (valueType) {
	case ArgValueType::NONE:
	case ArgValueType::ANY:
	BOOST_ASSERT(false);
	return boost::any();

	case ArgValueType::UNSIGNED: {
	// boost::lexical_cast<uint64_t> will accept negative number
	int64_t v = boost::lexical_cast<int64_t>(token);
	if (v < 0) {
	BOOST_THROW_EXCEPTION(std::out_of_range("value is negative"));
	}
	return static_cast<uint64_t>(v);
	}

	case ArgValueType::STRING:
	return token;

	case ArgValueType::REPORT_FORMAT:
	return parseReportFormat(token);

	case ArgValueType::NAME:
	return Name(token);

	case ArgValueType::FACE_URI:
	return FaceUri(token);

	case ArgValueType::FACE_ID_OR_URI:
	try {
	return boost::lexical_cast<uint64_t>(token);
	}
	catch (const boost::bad_lexical_cast&) {
	return FaceUri(token);
	}

	case ArgValueType::FACE_PERSISTENCY:
	return parseFacePersistency(token);

	case ArgValueType::ROUTE_ORIGIN:
	return boost::lexical_cast<RouteOrigin>(token);
	}

	BOOST_ASSERT(false);
	return boost::any();
	}

	} // namespace nfdc
	} // namespace tools
	} // namespace nfd