128 lines
3.9 KiB
C++
128 lines
3.9 KiB
C++
/*
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* This program source code file is part of KiCad, a free EDA CAD application.
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*
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* Copyright (C) 2021 Ola Rinta-Koski
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* Copyright (C) 2021 KiCad Developers, see AUTHORS.txt for contributors.
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef MARKUP_PARSER_H
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#define MARKUP_PARSER_H
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#include <pegtl.hpp>
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#include <pegtl/contrib/parse_tree.hpp>
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#include <iostream>
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#include <string>
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#include <utf8.h>
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namespace MARKUP
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{
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using namespace tao::pegtl;
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struct subscript;
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struct superscript;
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struct overbar;
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struct NODE : parse_tree::basic_node<NODE>
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{
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std::string asString() const;
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std::string typeString() const;
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bool isOverbar() const { return is_type<MARKUP::overbar>(); }
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bool isSubscript() const { return is_type<MARKUP::subscript>(); }
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bool isSuperscript() const { return is_type<MARKUP::superscript>(); }
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};
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struct varPrefix : string<'$', '{'> {};
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struct subPrefix : string<'_', '{'> {};
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struct supPrefix : string<'^', '{'> {};
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struct tildePrefix : string<'~', '{'> {};
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struct closeBrace : string<'}'> {};
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struct varName : plus<sor<identifier_other, string<' '>>> {};
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struct varNamespaceName : plus<identifier> {};
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struct varNamespace : seq<varNamespaceName, string<':'>> {};
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struct variable : seq<varPrefix, opt<varNamespace>, varName, closeBrace> {};
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/**
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* anyString =
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* a run of characters that do not start a command sequence, or if they do, they do not start
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* a complete command prefix (command char + open brace)
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*/
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struct anyString : plus<sor<utf8::not_one<'~', '$', '_', '^'>,
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seq<not_at<subPrefix>, string<'_'>>,
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seq<not_at<supPrefix>, string<'^'>>,
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seq<not_at<tildePrefix>, string<'~'>>>> {};
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struct prefixedSuperscript : seq<supPrefix, superscript> {};
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struct prefixedSubscript : seq<subPrefix, subscript> {};
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struct prefixedOverbar : seq<tildePrefix, overbar> {};
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struct anyStringWithinBraces : plus<sor<utf8::not_one<'~', '$', '_', '^', '}'>>> {};
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struct superscript : until<closeBrace, sor<variable, anyStringWithinBraces>> {};
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struct subscript : until<closeBrace, sor<variable, anyStringWithinBraces>> {};
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struct overbar : until<closeBrace, sor<variable, anyStringWithinBraces>> {};
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/**
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* Finally, the full grammar
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*/
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struct grammar : star<sor<variable,
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prefixedSubscript,
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prefixedSuperscript,
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prefixedOverbar,
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anyString>> {};
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template <typename Rule>
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using selector = parse_tree::selector< Rule,
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parse_tree::store_content::on<varNamespaceName,
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varName,
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anyString,
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anyStringWithinBraces>,
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parse_tree::discard_empty::on<superscript,
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subscript,
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overbar>>;
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class MARKUP_PARSER
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{
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public:
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MARKUP_PARSER( const std::string& source ) :
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in( source, "from_input" )
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{}
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std::unique_ptr<NODE> Parse();
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private:
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string_input<> in;
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};
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} // namespace MARKUP
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#endif //MARKUP_PARSER_H
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