src/ast_handlers.hpp - CzechLight/netconf-cli - Gitiles

 /*
  * Copyright (C) 2018 CESNET, https://photonics.cesnet.cz/
  * Copyright (C) 2018 FIT CVUT, https://fit.cvut.cz/
  *
  * Written by Václav Kubernát <kubervac@fit.cvut.cz>
  *
 */

 #pragma once

 #include <boost/mpl/for_each.hpp>
 #include <boost/spirit/home/x3.hpp>
 #include <boost/spirit/home/x3/support/utility/error_reporting.hpp>


 #include "ast_commands.hpp"
 #include "parser_context.hpp"
 #include "schema.hpp"
 #include "utils.hpp"
 namespace x3 = boost::spirit::x3;

 struct parser_context_tag;

 struct keyValue_class {
     template <typename T, typename Iterator, typename Context>
     void on_success(Iterator const&, Iterator const&, T& ast, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);

         if (parserContext.m_tmpListKeys.find(ast.first) != parserContext.m_tmpListKeys.end()) {
             _pass(context) = false;
             parserContext.m_errorMsg = "Key \"" + ast.first + "\" was entered more than once.";
         } else {
             parserContext.m_tmpListKeys.insert({ast.first, ast.second});
         }
     }

     template <typename Iterator, typename Exception, typename Context>
     x3::error_handler_result on_error(Iterator&, Iterator const&, Exception const&, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);
         parserContext.m_errorMsg = "Error parsing key values here:";
         return x3::error_handler_result::rethrow;
     }
 };

 struct node_identifier_class;

 boost::optional<std::string> optModuleToOptString(const boost::optional<module_> module);

 struct key_identifier_class {
     template <typename T, typename Iterator, typename Context>
     void on_success(Iterator const&, Iterator const&, T& ast, Context const& context)
     {
         ParserContext& parserContext = x3::get<parser_context_tag>(context);
         const Schema& schema = parserContext.m_schema;

         if (schema.listHasKey(dataPathToSchemaPath(parserContext.m_tmpListPath), ast)) {
             parserContext.m_tmpListKeyLeafPath.m_location = dataPathToSchemaPath(parserContext.m_tmpListPath);
             parserContext.m_tmpListKeyLeafPath.m_node = { optModuleToOptString(parserContext.m_tmpListPath.m_nodes.back().m_prefix), ast };
         } else {
             auto listName = std::get<list_>(parserContext.m_tmpListPath.m_nodes.back().m_suffix).m_name;
             parserContext.m_errorMsg = listName + " is not indexed by \"" + ast + "\".";
             _pass(context) = false;
         }
     }
 };

 struct module_identifier_class;

 struct listSuffix_class {
     template <typename T, typename Iterator, typename Context>
     void on_success(Iterator const&, Iterator const&, T& ast, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);
         const Schema& schema = parserContext.m_schema;

         const auto& keysNeeded = schema.listKeys(dataPathToSchemaPath(parserContext.m_tmpListPath));
         std::set<std::string> keysSupplied;
         for (const auto& it : ast)
             keysSupplied.insert(it.first);

         if (keysNeeded != keysSupplied) {
             auto listName = std::get<list_>(parserContext.m_tmpListPath.m_nodes.back().m_suffix).m_name;
             parserContext.m_errorMsg = "Not enough keys for " + listName + ". " +
                                        "These keys were not supplied:";
             std::set<std::string> missingKeys;
             std::set_difference(keysNeeded.begin(), keysNeeded.end(),
                                 keysSupplied.begin(), keysSupplied.end(),
                                 std::inserter(missingKeys, missingKeys.end()));

             for (const auto& it : missingKeys)
                 parserContext.m_errorMsg += " " + it;
             parserContext.m_errorMsg += ".";

             _pass(context) = false;
             return;
         }

         // Clean up after listSuffix, in case someone wants to parse more listSuffixes
         parserContext.m_tmpListKeys.clear();
     }

     template <typename Iterator, typename Exception, typename Context>
     x3::error_handler_result on_error(Iterator&, Iterator const&, Exception const&, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);
         if (parserContext.m_errorMsg.empty())
             parserContext.m_errorMsg = "Expecting ']' here:";
         return x3::error_handler_result::rethrow;
     }
 };

 struct module_class {
     template <typename T, typename Iterator, typename Context>
     void on_success(Iterator const&, Iterator const&, T& ast, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);
         const auto& schema = parserContext.m_schema;

         if (!schema.isModule(ast.m_name)) {
             parserContext.m_errorMsg = "Invalid module name.";
             _pass(context) = false;
         }
     }
 };

 struct absoluteStart_class {
     template <typename T, typename Iterator, typename Context>
     void on_success(Iterator const&, Iterator const&, T&, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);
         parserContext.clearPath();
     }
 };

 struct discard_class;

 struct ls_class;

 struct cd_class {
     template <typename Iterator, typename Exception, typename Context>
     x3::error_handler_result on_error(Iterator&, Iterator const&, Exception const& x, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);
         if (parserContext.m_errorMsg.empty())
             parserContext.m_errorMsg = "Expected " + x.which() + " here:";
         return x3::error_handler_result::rethrow;
     }
 };

 struct presenceContainerPath_class {
     template <typename T, typename Iterator, typename Context>
     void on_success(Iterator const&, Iterator const&, T& ast, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);
         const auto& schema = parserContext.m_schema;
         if (ast.m_nodes.empty()) {
             parserContext.m_errorMsg = "This container is not a presence container.";
             _pass(context) = false;
             return;
         }

         if (schema.nodeType(pathToSchemaString(parserContext.currentSchemaPath(), Prefixes::Always)) != yang::NodeTypes::PresenceContainer) {
             parserContext.m_errorMsg = "This container is not a presence container.";
             _pass(context) = false;
         }
     }
 };

 struct listInstancePath_class {
     template <typename T, typename Iterator, typename Context>
     void on_success(Iterator const&, Iterator const&, T& ast, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);
         if (ast.m_nodes.empty() || !std::holds_alternative<listElement_>(ast.m_nodes.back().m_suffix)) {
             parserContext.m_errorMsg = "This is not a list instance.";
             _pass(context) = false;
         }
     }
 };

 struct leafListElementPath_class {
     template <typename T, typename Iterator, typename Context>
     void on_success(Iterator const&, Iterator const&, T& ast, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);
         if (ast.m_nodes.empty() || !std::holds_alternative<leafListElement_>(ast.m_nodes.back().m_suffix)) {
             parserContext.m_errorMsg = "This is not a leaf list element.";
             _pass(context) = false;
         }
     }
 };

 struct space_separator_class {
     template <typename T, typename Iterator, typename Context>
     void on_success(Iterator const&, Iterator const&, T&, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);
         parserContext.m_suggestions.clear();
         parserContext.m_completionIterator = boost::none;
     }
 };

 struct create_class {
     template <typename Iterator, typename Exception, typename Context>
     x3::error_handler_result on_error(Iterator&, Iterator const&, Exception const&, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);
         if (parserContext.m_errorMsg.empty())
             parserContext.m_errorMsg = "Couldn't parse create/delete command.";
         return x3::error_handler_result::rethrow;
     }
 };

 struct delete_class {
     template <typename Iterator, typename Exception, typename Context>
     x3::error_handler_result on_error(Iterator&, Iterator const&, Exception const&, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);
         if (parserContext.m_errorMsg.empty())
             parserContext.m_errorMsg = "Couldn't parse create/delete command.";
         return x3::error_handler_result::rethrow;
     }
 };

 struct writable_leaf_path_class {
     template <typename T, typename Iterator, typename Context>
     void on_success(Iterator const&, Iterator const&, T&, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);
         if (parserContext.currentSchemaPath().m_nodes.empty()) {
             parserContext.m_errorMsg = "This is not a path to leaf.";
             _pass(context) = false;
             return;
         }

         try {
             auto lastNode = parserContext.currentSchemaPath().m_nodes.back();
             auto leaf = std::get<leaf_>(lastNode.m_suffix);
             auto location = pathWithoutLastNode(parserContext.currentSchemaPath());
             ModuleNodePair node{lastNode.m_prefix.flat_map([](const auto& it) { return boost::optional<std::string>{it.m_name}; }), leaf.m_name};

             parserContext.m_tmpListKeyLeafPath.m_location = location;
             parserContext.m_tmpListKeyLeafPath.m_node = node;

         } catch (std::bad_variant_access&) {
             parserContext.m_errorMsg = "This is not a path to leaf.";
             _pass(context) = false;
         }
     }
 };

 struct set_class {
     template <typename Iterator, typename Exception, typename Context>
     x3::error_handler_result on_error(Iterator&, Iterator const&, Exception const& x, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);
         if (parserContext.m_errorMsg.empty())
             parserContext.m_errorMsg = "Expected " + x.which() + " here:";
         return x3::error_handler_result::rethrow;
     }
 };

 struct commit_class;

 struct describe_class;

 struct help_class;

 struct get_class;

 struct copy_class;

 struct move_class;

 struct dump_class;

 struct command_class {
     template <typename Iterator, typename Exception, typename Context>
     x3::error_handler_result on_error(Iterator&, Iterator const&, Exception const& x, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);
         auto& error_handler = x3::get<x3::error_handler_tag>(context).get();
         if (parserContext.m_errorMsg.empty()) {
             parserContext.m_errorMsg = "Unknown command.";
         }
         error_handler(x.where(), parserContext.m_errorMsg);
         return x3::error_handler_result::fail;
     }
 };

 struct initializePath_class {
     template <typename T, typename Iterator, typename Context>
     void on_success(Iterator const&, Iterator const&, T&, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);
         parserContext.resetPath();
         parserContext.m_tmpListPath = dataPath_{};
         parserContext.m_tmpListKeys.clear();
         parserContext.m_suggestions.clear();
     }
 };

 struct trailingSlash_class;

 std::set<Completion> generateMissingKeyCompletionSet(std::set<std::string> keysNeeded, ListInstance currentSet);

 struct createKeySuggestions_class {
     template <typename T, typename Iterator, typename Context>
     void on_success(Iterator const& begin, Iterator const&, T&, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);
         const auto& schema = parserContext.m_schema;

         parserContext.m_completionIterator = begin;

         const auto& keysNeeded = schema.listKeys(dataPathToSchemaPath(parserContext.m_tmpListPath));
         parserContext.m_suggestions = generateMissingKeyCompletionSet(keysNeeded, parserContext.m_tmpListKeys);
     }
 };

 std::string leafDataToCompletion(const leaf_data_& value);

 struct createValueSuggestions_class {
     template <typename T, typename Iterator, typename Context>
     void on_success(Iterator const& begin, Iterator const&, T&, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);
         if (!parserContext.m_completing) {
             return;
         }
         const auto& dataQuery = parserContext.m_dataquery;

         parserContext.m_completionIterator = begin;
         auto listInstances = dataQuery->listKeys(parserContext.m_tmpListPath);

         decltype(listInstances) filteredInstances;
         //This filters out instances, which don't correspond to the partial instance we have.
         const auto partialFitsComplete = [&parserContext] (const auto& complete) {
             const auto& partial = parserContext.m_tmpListKeys;
             return std::all_of(partial.begin(), partial.end(), [&complete] (const auto& oneKV) {
                     const auto& [k, v] = oneKV;
                     return complete.at(k) == v;
                     });
         };
         std::copy_if(listInstances.begin(), listInstances.end(), std::inserter(filteredInstances, filteredInstances.end()), partialFitsComplete);

         std::set<Completion> validValues;

         std::transform(filteredInstances.begin(), filteredInstances.end(), std::inserter(validValues, validValues.end()), [&parserContext](const auto& instance) {
             return Completion{leafDataToCompletion(instance.at(parserContext.m_tmpListKeyLeafPath.m_node.second))};
         });

         parserContext.m_suggestions = validValues;
     }
 };

 struct suggestKeysEnd_class {
     template <typename T, typename Iterator, typename Context>
     void on_success(Iterator const& begin, Iterator const&, T&, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);
         const auto& schema = parserContext.m_schema;

         parserContext.m_completionIterator = begin;
         const auto& keysNeeded = schema.listKeys(dataPathToSchemaPath(parserContext.m_tmpListPath));
         if (generateMissingKeyCompletionSet(keysNeeded, parserContext.m_tmpListKeys).empty()) {
             parserContext.m_suggestions = {Completion{"]/"}};
         } else {
             parserContext.m_suggestions = {Completion{"]["}};
         }
     }
 };

 template <typename T>
 std::string commandNamesVisitor (boost::type<T>)
 {
     return T::name;
 }

 struct createCommandSuggestions_class {
     template <typename T, typename Iterator, typename Context>
     void on_success(Iterator const& begin, Iterator const&, T&, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);
         parserContext.m_completionIterator = begin;

         parserContext.m_suggestions.clear();
         boost::mpl::for_each<CommandTypes, boost::type<boost::mpl::_>>([&parserContext](auto cmd) {
             parserContext.m_suggestions.insert({commandNamesVisitor(cmd), " "});
         });
     }
 };

 struct completing_class {
     template <typename T, typename Iterator, typename Context>
     void on_success(Iterator const&, Iterator const&, T&, Context const& context)
     {
         auto& parserContext = x3::get<parser_context_tag>(context);

         if (!parserContext.m_completing)
             _pass(context) = false;
     }
 };
	/*
	* Copyright (C) 2018 CESNET, https://photonics.cesnet.cz/
	* Copyright (C) 2018 FIT CVUT, https://fit.cvut.cz/
	*
	* Written by Václav Kubernát <kubervac@fit.cvut.cz>
	*
	*/

	#pragma once

	#include <boost/mpl/for_each.hpp>
	#include <boost/spirit/home/x3.hpp>
	#include <boost/spirit/home/x3/support/utility/error_reporting.hpp>


	#include "ast_commands.hpp"
	#include "parser_context.hpp"
	#include "schema.hpp"
	#include "utils.hpp"
	namespace x3 = boost::spirit::x3;

	struct parser_context_tag;

	struct keyValue_class {
	template <typename T, typename Iterator, typename Context>
	void on_success(Iterator const&, Iterator const&, T& ast, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);

	if (parserContext.m_tmpListKeys.find(ast.first) != parserContext.m_tmpListKeys.end()) {
	_pass(context) = false;
	parserContext.m_errorMsg = "Key \"" + ast.first + "\" was entered more than once.";
	} else {
	parserContext.m_tmpListKeys.insert({ast.first, ast.second});
	}
	}

	template <typename Iterator, typename Exception, typename Context>
	x3::error_handler_result on_error(Iterator&, Iterator const&, Exception const&, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);
	parserContext.m_errorMsg = "Error parsing key values here:";
	return x3::error_handler_result::rethrow;
	}
	};

	struct node_identifier_class;

	boost::optional<std::string> optModuleToOptString(const boost::optional<module_> module);

	struct key_identifier_class {
	template <typename T, typename Iterator, typename Context>
	void on_success(Iterator const&, Iterator const&, T& ast, Context const& context)
	{
	ParserContext& parserContext = x3::get<parser_context_tag>(context);
	const Schema& schema = parserContext.m_schema;

	if (schema.listHasKey(dataPathToSchemaPath(parserContext.m_tmpListPath), ast)) {
	parserContext.m_tmpListKeyLeafPath.m_location = dataPathToSchemaPath(parserContext.m_tmpListPath);
	parserContext.m_tmpListKeyLeafPath.m_node = { optModuleToOptString(parserContext.m_tmpListPath.m_nodes.back().m_prefix), ast };
	} else {
	auto listName = std::get<list_>(parserContext.m_tmpListPath.m_nodes.back().m_suffix).m_name;
	parserContext.m_errorMsg = listName + " is not indexed by \"" + ast + "\".";
	_pass(context) = false;
	}
	}
	};

	struct module_identifier_class;

	struct listSuffix_class {
	template <typename T, typename Iterator, typename Context>
	void on_success(Iterator const&, Iterator const&, T& ast, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);
	const Schema& schema = parserContext.m_schema;

	const auto& keysNeeded = schema.listKeys(dataPathToSchemaPath(parserContext.m_tmpListPath));
	std::set<std::string> keysSupplied;
	for (const auto& it : ast)
	keysSupplied.insert(it.first);

	if (keysNeeded != keysSupplied) {
	auto listName = std::get<list_>(parserContext.m_tmpListPath.m_nodes.back().m_suffix).m_name;
	parserContext.m_errorMsg = "Not enough keys for " + listName + ". " +
	"These keys were not supplied:";
	std::set<std::string> missingKeys;
	std::set_difference(keysNeeded.begin(), keysNeeded.end(),
	keysSupplied.begin(), keysSupplied.end(),
	std::inserter(missingKeys, missingKeys.end()));

	for (const auto& it : missingKeys)
	parserContext.m_errorMsg += " " + it;
	parserContext.m_errorMsg += ".";

	_pass(context) = false;
	return;
	}

	// Clean up after listSuffix, in case someone wants to parse more listSuffixes
	parserContext.m_tmpListKeys.clear();
	}

	template <typename Iterator, typename Exception, typename Context>
	x3::error_handler_result on_error(Iterator&, Iterator const&, Exception const&, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);
	if (parserContext.m_errorMsg.empty())
	parserContext.m_errorMsg = "Expecting ']' here:";
	return x3::error_handler_result::rethrow;
	}
	};

	struct module_class {
	template <typename T, typename Iterator, typename Context>
	void on_success(Iterator const&, Iterator const&, T& ast, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);
	const auto& schema = parserContext.m_schema;

	if (!schema.isModule(ast.m_name)) {
	parserContext.m_errorMsg = "Invalid module name.";
	_pass(context) = false;
	}
	}
	};

	struct absoluteStart_class {
	template <typename T, typename Iterator, typename Context>
	void on_success(Iterator const&, Iterator const&, T&, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);
	parserContext.clearPath();
	}
	};

	struct discard_class;

	struct ls_class;

	struct cd_class {
	template <typename Iterator, typename Exception, typename Context>
	x3::error_handler_result on_error(Iterator&, Iterator const&, Exception const& x, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);
	if (parserContext.m_errorMsg.empty())
	parserContext.m_errorMsg = "Expected " + x.which() + " here:";
	return x3::error_handler_result::rethrow;
	}
	};

	struct presenceContainerPath_class {
	template <typename T, typename Iterator, typename Context>
	void on_success(Iterator const&, Iterator const&, T& ast, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);
	const auto& schema = parserContext.m_schema;
	if (ast.m_nodes.empty()) {
	parserContext.m_errorMsg = "This container is not a presence container.";
	_pass(context) = false;
	return;
	}

	if (schema.nodeType(pathToSchemaString(parserContext.currentSchemaPath(), Prefixes::Always)) != yang::NodeTypes::PresenceContainer) {
	parserContext.m_errorMsg = "This container is not a presence container.";
	_pass(context) = false;
	}
	}
	};

	struct listInstancePath_class {
	template <typename T, typename Iterator, typename Context>
	void on_success(Iterator const&, Iterator const&, T& ast, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);
	if (ast.m_nodes.empty() \|\| !std::holds_alternative<listElement_>(ast.m_nodes.back().m_suffix)) {
	parserContext.m_errorMsg = "This is not a list instance.";
	_pass(context) = false;
	}
	}
	};

	struct leafListElementPath_class {
	template <typename T, typename Iterator, typename Context>
	void on_success(Iterator const&, Iterator const&, T& ast, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);
	if (ast.m_nodes.empty() \|\| !std::holds_alternative<leafListElement_>(ast.m_nodes.back().m_suffix)) {
	parserContext.m_errorMsg = "This is not a leaf list element.";
	_pass(context) = false;
	}
	}
	};

	struct space_separator_class {
	template <typename T, typename Iterator, typename Context>
	void on_success(Iterator const&, Iterator const&, T&, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);
	parserContext.m_suggestions.clear();
	parserContext.m_completionIterator = boost::none;
	}
	};

	struct create_class {
	template <typename Iterator, typename Exception, typename Context>
	x3::error_handler_result on_error(Iterator&, Iterator const&, Exception const&, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);
	if (parserContext.m_errorMsg.empty())
	parserContext.m_errorMsg = "Couldn't parse create/delete command.";
	return x3::error_handler_result::rethrow;
	}
	};

	struct delete_class {
	template <typename Iterator, typename Exception, typename Context>
	x3::error_handler_result on_error(Iterator&, Iterator const&, Exception const&, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);
	if (parserContext.m_errorMsg.empty())
	parserContext.m_errorMsg = "Couldn't parse create/delete command.";
	return x3::error_handler_result::rethrow;
	}
	};

	struct writable_leaf_path_class {
	template <typename T, typename Iterator, typename Context>
	void on_success(Iterator const&, Iterator const&, T&, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);
	if (parserContext.currentSchemaPath().m_nodes.empty()) {
	parserContext.m_errorMsg = "This is not a path to leaf.";
	_pass(context) = false;
	return;
	}

	try {
	auto lastNode = parserContext.currentSchemaPath().m_nodes.back();
	auto leaf = std::get<leaf_>(lastNode.m_suffix);
	auto location = pathWithoutLastNode(parserContext.currentSchemaPath());
	ModuleNodePair node{lastNode.m_prefix.flat_map([](const auto& it) { return boost::optional<std::string>{it.m_name}; }), leaf.m_name};

	parserContext.m_tmpListKeyLeafPath.m_location = location;
	parserContext.m_tmpListKeyLeafPath.m_node = node;

	} catch (std::bad_variant_access&) {
	parserContext.m_errorMsg = "This is not a path to leaf.";
	_pass(context) = false;
	}
	}
	};

	struct set_class {
	template <typename Iterator, typename Exception, typename Context>
	x3::error_handler_result on_error(Iterator&, Iterator const&, Exception const& x, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);
	if (parserContext.m_errorMsg.empty())
	parserContext.m_errorMsg = "Expected " + x.which() + " here:";
	return x3::error_handler_result::rethrow;
	}
	};

	struct commit_class;

	struct describe_class;

	struct help_class;

	struct get_class;

	struct copy_class;

	struct move_class;

	struct dump_class;

	struct command_class {
	template <typename Iterator, typename Exception, typename Context>
	x3::error_handler_result on_error(Iterator&, Iterator const&, Exception const& x, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);
	auto& error_handler = x3::get<x3::error_handler_tag>(context).get();
	if (parserContext.m_errorMsg.empty()) {
	parserContext.m_errorMsg = "Unknown command.";
	}
	error_handler(x.where(), parserContext.m_errorMsg);
	return x3::error_handler_result::fail;
	}
	};

	struct initializePath_class {
	template <typename T, typename Iterator, typename Context>
	void on_success(Iterator const&, Iterator const&, T&, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);
	parserContext.resetPath();
	parserContext.m_tmpListPath = dataPath_{};
	parserContext.m_tmpListKeys.clear();
	parserContext.m_suggestions.clear();
	}
	};

	struct trailingSlash_class;

	std::set<Completion> generateMissingKeyCompletionSet(std::set<std::string> keysNeeded, ListInstance currentSet);

	struct createKeySuggestions_class {
	template <typename T, typename Iterator, typename Context>
	void on_success(Iterator const& begin, Iterator const&, T&, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);
	const auto& schema = parserContext.m_schema;

	parserContext.m_completionIterator = begin;

	const auto& keysNeeded = schema.listKeys(dataPathToSchemaPath(parserContext.m_tmpListPath));
	parserContext.m_suggestions = generateMissingKeyCompletionSet(keysNeeded, parserContext.m_tmpListKeys);
	}
	};

	std::string leafDataToCompletion(const leaf_data_& value);

	struct createValueSuggestions_class {
	template <typename T, typename Iterator, typename Context>
	void on_success(Iterator const& begin, Iterator const&, T&, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);
	if (!parserContext.m_completing) {
	return;
	}
	const auto& dataQuery = parserContext.m_dataquery;

	parserContext.m_completionIterator = begin;
	auto listInstances = dataQuery->listKeys(parserContext.m_tmpListPath);

	decltype(listInstances) filteredInstances;
	//This filters out instances, which don't correspond to the partial instance we have.
	const auto partialFitsComplete = [&parserContext] (const auto& complete) {
	const auto& partial = parserContext.m_tmpListKeys;
	return std::all_of(partial.begin(), partial.end(), [&complete] (const auto& oneKV) {
	const auto& [k, v] = oneKV;
	return complete.at(k) == v;
	});
	};
	std::copy_if(listInstances.begin(), listInstances.end(), std::inserter(filteredInstances, filteredInstances.end()), partialFitsComplete);

	std::set<Completion> validValues;

	std::transform(filteredInstances.begin(), filteredInstances.end(), std::inserter(validValues, validValues.end()), [&parserContext](const auto& instance) {
	return Completion{leafDataToCompletion(instance.at(parserContext.m_tmpListKeyLeafPath.m_node.second))};
	});

	parserContext.m_suggestions = validValues;
	}
	};

	struct suggestKeysEnd_class {
	template <typename T, typename Iterator, typename Context>
	void on_success(Iterator const& begin, Iterator const&, T&, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);
	const auto& schema = parserContext.m_schema;

	parserContext.m_completionIterator = begin;
	const auto& keysNeeded = schema.listKeys(dataPathToSchemaPath(parserContext.m_tmpListPath));
	if (generateMissingKeyCompletionSet(keysNeeded, parserContext.m_tmpListKeys).empty()) {
	parserContext.m_suggestions = {Completion{"]/"}};
	} else {
	parserContext.m_suggestions = {Completion{"]["}};
	}
	}
	};

	template <typename T>
	std::string commandNamesVisitor (boost::type<T>)
	{
	return T::name;
	}

	struct createCommandSuggestions_class {
	template <typename T, typename Iterator, typename Context>
	void on_success(Iterator const& begin, Iterator const&, T&, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);
	parserContext.m_completionIterator = begin;

	parserContext.m_suggestions.clear();
	boost::mpl::for_each<CommandTypes, boost::type<boost::mpl::_>>([&parserContext](auto cmd) {
	parserContext.m_suggestions.insert({commandNamesVisitor(cmd), " "});
	});
	}
	};

	struct completing_class {
	template <typename T, typename Iterator, typename Context>
	void on_success(Iterator const&, Iterator const&, T&, Context const& context)
	{
	auto& parserContext = x3::get<parser_context_tag>(context);

	if (!parserContext.m_completing)
	_pass(context) = false;
	}
	};