src/grammars.hpp

/*
 * 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 "ast_commands.hpp"
#include "ast_handlers.hpp"


x3::rule<keyValue_class, keyValue_> const keyValue = "keyValue";
x3::rule<identifier_class, std::string> const identifier = "identifier";
x3::rule<listPrefix_class, std::string> const listPrefix = "listPrefix";
x3::rule<listSuffix_class, std::vector<keyValue_>> const listSuffix = "listSuffix";
x3::rule<listElement_class, listElement_> const listElement = "listElement";
x3::rule<nodeup_class, nodeup_> const nodeup = "nodeup";
x3::rule<container_class, container_> const container = "container";
x3::rule<leaf_class, leaf_> const leaf = "leaf";
x3::rule<path_class, path_> const path = "path";
x3::rule<data_string_class, std::string> const data_string = "data_string";
x3::rule<cd_class, cd_> const cd = "cd";
x3::rule<set_class, set_> const set = "set";
x3::rule<create_class, create_> const create = "create";
x3::rule<delete_class, delete_> const delete_rule = "delete_rule";
x3::rule<command_class, command_> const command = "command";


auto const keyValue_def =
        lexeme[+alnum >> '=' >> +alnum];

auto const identifier_def =
        lexeme[
                ((alpha | char_("_")) >> *(alnum | char_("_") | char_("-") | char_(".")))
        ];

auto const listPrefix_def =
        identifier >> '[';

// even though we don't allow no keys to be supplied, the star allows me to check which keys are missing
auto const listSuffix_def =
        *keyValue > ']';

auto const listElement_def =
        listPrefix > listSuffix;

auto const nodeup_def =
        lit("..") > x3::attr(nodeup_());

auto const container_def =
        identifier;

auto const leaf_def =
        identifier;

// leaf cannot be in the middle of a path, however, I need the grammar's attribute to be a vector of variants
auto const path_def =
        (container | listElement | nodeup | leaf) % '/';

auto const data_string_def =
        lexeme[+char_];

auto const space_separator =
        x3::omit[x3::no_skip[space]];

auto const cd_def =
        lit("cd") > space_separator > path >> x3::eoi;

auto const create_def =
        lit("create") > space_separator > path >> x3::eoi;

auto const delete_rule_def =
        lit("delete") > space_separator > path >> x3::eoi;

auto const set_def =
        lit("set") > space_separator > path > space_separator > data_string >> x3::eoi;

auto const command_def =
        cd | create | delete_rule | set;

BOOST_SPIRIT_DEFINE(keyValue)
BOOST_SPIRIT_DEFINE(identifier)
BOOST_SPIRIT_DEFINE(listPrefix)
BOOST_SPIRIT_DEFINE(listSuffix)
BOOST_SPIRIT_DEFINE(listElement)
BOOST_SPIRIT_DEFINE(nodeup)
BOOST_SPIRIT_DEFINE(container)
BOOST_SPIRIT_DEFINE(leaf)
BOOST_SPIRIT_DEFINE(path)
BOOST_SPIRIT_DEFINE(data_string)
BOOST_SPIRIT_DEFINE(set)
BOOST_SPIRIT_DEFINE(cd)
BOOST_SPIRIT_DEFINE(create)
BOOST_SPIRIT_DEFINE(delete_rule)
BOOST_SPIRIT_DEFINE(command)