Refactor path parser to a separate file
Change-Id: I147d495470d29b41ffaa9c727eff02afe4c0ef34
diff --git a/src/path_parser.hpp b/src/path_parser.hpp
new file mode 100644
index 0000000..af98208
--- /dev/null
+++ b/src/path_parser.hpp
@@ -0,0 +1,173 @@
+/*
+ * Copyright (C) 2020 CESNET, https://photonics.cesnet.cz/
+ *
+ * Written by Václav Kubernát <kubernat@cesnet.cz>
+ *
+*/
+
+#pragma once
+
+#include <boost/spirit/home/x3.hpp>
+#include "ast_handlers.hpp"
+#include "common_parsers.hpp"
+#include "leaf_data.hpp"
+
+namespace x3 = boost::spirit::x3;
+
+x3::rule<dataPath_class, dataPath_> const dataPath = "dataPath";
+x3::rule<schemaPath_class, schemaPath_> const schemaPath = "schemaPath";
+x3::rule<dataNodeList_class, decltype(dataPath_::m_nodes)::value_type> const dataNodeList = "dataNodeList";
+x3::rule<dataNodesListEnd_class, decltype(dataPath_::m_nodes)> const dataNodesListEnd = "dataNodesListEnd";
+x3::rule<dataPathListEnd_class, dataPath_> const dataPathListEnd = "dataPathListEnd";
+x3::rule<leaf_path_class, dataPath_> const leafPath = "leafPath";
+x3::rule<presenceContainerPath_class, dataPath_> const presenceContainerPath = "presenceContainerPath";
+x3::rule<listInstancePath_class, dataPath_> const listInstancePath = "listInstancePath";
+x3::rule<initializePath_class, x3::unused_type> const initializePath = "initializePath";
+x3::rule<createPathSuggestions_class, x3::unused_type> const createPathSuggestions = "createPathSuggestions";
+x3::rule<trailingSlash_class, TrailingSlash> const trailingSlash = "trailingSlash";
+x3::rule<dataNode_class, dataNode_> const dataNode = "dataNode";
+x3::rule<schemaNode_class, schemaNode_> const schemaNode = "schemaNode";
+x3::rule<absoluteStart_class, Scope> const absoluteStart = "absoluteStart";
+x3::rule<keyValue_class, keyValue_> const keyValue = "keyValue";
+x3::rule<key_identifier_class, std::string> const key_identifier = "key_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<list_class, list_> const list = "list";
+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<createKeySuggestions_class, x3::unused_type> const createKeySuggestions = "createKeySuggestions";
+x3::rule<createValueSuggestions_class, x3::unused_type> const createValueSuggestions = "createValueSuggestions";
+x3::rule<suggestKeysEnd_class, x3::unused_type> const suggestKeysEnd = "suggestKeysEnd";
+
+
+#if __clang__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Woverloaded-shift-op-parentheses"
+#endif
+
+auto const rest =
+ x3::omit[x3::no_skip[+(x3::char_ - '/' - space_separator)]];
+
+auto const key_identifier_def =
+ x3::lexeme[
+ ((x3::alpha | char_("_")) >> *(x3::alnum | char_("_") | char_("-") | char_(".")))
+ ];
+
+auto const createKeySuggestions_def =
+ x3::eps;
+
+auto const createValueSuggestions_def =
+ x3::eps;
+
+auto const suggestKeysEnd_def =
+ x3::eps;
+
+auto const keyValue_def =
+ key_identifier > '=' > createValueSuggestions > leaf_data;
+
+auto const keyValueWrapper =
+ x3::lexeme['[' > createKeySuggestions > keyValue > suggestKeysEnd > ']'];
+
+auto const listPrefix_def =
+ node_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 =
+ *keyValueWrapper;
+
+auto const listElement_def =
+ listPrefix >> &char_('[') > listSuffix;
+
+auto const list_def =
+ node_identifier >> !char_('[');
+
+auto const nodeup_def =
+ x3::lit("..") > x3::attr(nodeup_());
+
+auto const container_def =
+ node_identifier;
+
+auto const leaf_def =
+ node_identifier;
+
+auto const absoluteStart_def =
+ x3::omit['/'] >> x3::attr(Scope::Absolute);
+
+auto const trailingSlash_def =
+ x3::omit['/'] >> x3::attr(TrailingSlash::Present);
+
+auto const createPathSuggestions_def =
+ x3::eps;
+
+// leaf cannot be in the middle of a path, however, I need the grammar's attribute to be a vector of variants
+auto const schemaNode_def =
+ createPathSuggestions >> -(module) >> (container | list | nodeup | leaf);
+
+auto const dataNode_def =
+ createPathSuggestions >> -(module) >> (container | listElement | nodeup | leaf);
+
+// I have to insert an empty vector to the first alternative, otherwise they won't have the same attribute
+auto const dataPath_def = initializePath >> absoluteStart >> createPathSuggestions >> x3::attr(decltype(dataPath_::m_nodes)()) >> x3::attr(TrailingSlash::NonPresent) >> x3::eoi | initializePath >> -(absoluteStart >> createPathSuggestions) >> dataNode % '/' >> (-(trailingSlash >> createPathSuggestions) >> -(completing >> rest) >> (&space_separator | x3::eoi));
+
+auto const dataNodeList_def =
+ createPathSuggestions >> -(module) >> list;
+
+// This intermediate rule is mandatory, because we need the first alternative
+// to be collapsed to a vector. If we didn't use the intermediate rule,
+// Spirit wouldn't know we want it to collapse.
+// https://github.com/boostorg/spirit/issues/408
+auto const dataNodesListEnd_def =
+ dataNode % '/' >> '/' >> dataNodeList >> -(&char_('/') >> createPathSuggestions) |
+ x3::attr(decltype(dataPath_::m_nodes)()) >> dataNodeList;
+
+auto const dataPathListEnd_def = initializePath >> absoluteStart >> createPathSuggestions >> x3::attr(decltype(dataPath_::m_nodes)()) >> x3::attr(TrailingSlash::NonPresent) >> x3::eoi | initializePath >> -(absoluteStart >> createPathSuggestions) >> dataNodesListEnd >> (-(trailingSlash >> createPathSuggestions) >> -(completing >> rest) >> (&space_separator | x3::eoi));
+
+auto const schemaPath_def = initializePath >> absoluteStart >> createPathSuggestions >> x3::attr(decltype(schemaPath_::m_nodes)()) >> x3::attr(TrailingSlash::NonPresent) >> x3::eoi | initializePath >> -(absoluteStart >> createPathSuggestions) >> schemaNode % '/' >> (-(trailingSlash >> createPathSuggestions) >> -(completing >> rest) >> (&space_separator | x3::eoi));
+
+auto const leafPath_def =
+ dataPath;
+
+auto const presenceContainerPath_def =
+ dataPath;
+
+auto const listInstancePath_def =
+ dataPath;
+
+// A "nothing" parser, which is used to indicate we tried to parse a path
+auto const initializePath_def =
+ x3::eps;
+
+
+
+#if __clang__
+#pragma GCC diagnostic pop
+#endif
+
+BOOST_SPIRIT_DEFINE(keyValue)
+BOOST_SPIRIT_DEFINE(key_identifier)
+BOOST_SPIRIT_DEFINE(listPrefix)
+BOOST_SPIRIT_DEFINE(listSuffix)
+BOOST_SPIRIT_DEFINE(listElement)
+BOOST_SPIRIT_DEFINE(list)
+BOOST_SPIRIT_DEFINE(nodeup)
+BOOST_SPIRIT_DEFINE(schemaNode)
+BOOST_SPIRIT_DEFINE(dataNode)
+BOOST_SPIRIT_DEFINE(container)
+BOOST_SPIRIT_DEFINE(leaf)
+BOOST_SPIRIT_DEFINE(dataNodeList)
+BOOST_SPIRIT_DEFINE(dataNodesListEnd)
+BOOST_SPIRIT_DEFINE(leafPath)
+BOOST_SPIRIT_DEFINE(presenceContainerPath)
+BOOST_SPIRIT_DEFINE(listInstancePath)
+BOOST_SPIRIT_DEFINE(schemaPath)
+BOOST_SPIRIT_DEFINE(dataPath)
+BOOST_SPIRIT_DEFINE(dataPathListEnd)
+BOOST_SPIRIT_DEFINE(initializePath)
+BOOST_SPIRIT_DEFINE(createKeySuggestions)
+BOOST_SPIRIT_DEFINE(createPathSuggestions)
+BOOST_SPIRIT_DEFINE(createValueSuggestions)
+BOOST_SPIRIT_DEFINE(suggestKeysEnd)
+BOOST_SPIRIT_DEFINE(absoluteStart)
+BOOST_SPIRIT_DEFINE(trailingSlash)