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Diffstat (limited to '3rdParty/Boost/src/boost/spirit/home/classic/core/parser.hpp')
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diff --git a/3rdParty/Boost/src/boost/spirit/home/classic/core/parser.hpp b/3rdParty/Boost/src/boost/spirit/home/classic/core/parser.hpp new file mode 100644 index 0000000..8f6bc6a --- /dev/null +++ b/3rdParty/Boost/src/boost/spirit/home/classic/core/parser.hpp @@ -0,0 +1,223 @@ +/*============================================================================= + Copyright (c) 1998-2003 Joel de Guzman + http://spirit.sourceforge.net/ + + Distributed under the Boost Software License, Version 1.0. (See accompanying + file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) +=============================================================================*/ +#if !defined(BOOST_SPIRIT_PARSER_HPP) +#define BOOST_SPIRIT_PARSER_HPP + +#include <boost/config.hpp> +#include <boost/type_traits/remove_reference.hpp> +#include <boost/spirit/home/classic/namespace.hpp> +#include <boost/spirit/home/classic/core/scanner/scanner.hpp> +#include <boost/spirit/home/classic/core/nil.hpp> + +namespace boost { namespace spirit { + +BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN + + template <typename ParserT, typename ActionT> + class action; // forward declaration + + /////////////////////////////////////////////////////////////////////////// + // + // Parser categories + // + // Helper template classes to distinguish different types of + // parsers. The following categories are the most generic. More + // specific types may inherit from these. Each parser has a typedef + // parser_category_t that defines its category. By default, if one + // is not specified, it will inherit from the base parser class + // which typedefs its parser_category_t as plain_parser_category. + // + // - plain parser has nothing special + // - binary parser has subject a and b (e.g. alternative) + // - unary parser has single subject (e.g. kleene star) + // - action parser has an attached action parser + // + /////////////////////////////////////////////////////////////////////////// + struct plain_parser_category {}; + struct binary_parser_category : plain_parser_category {}; + struct unary_parser_category : plain_parser_category {}; + struct action_parser_category : unary_parser_category {}; + + /////////////////////////////////////////////////////////////////////////// + // + // parser_result metafunction + // + // Given a scanner type ScannerT and a parser type ParserT, the + // parser_result metafunction provides the actual result of the + // parser. + // + // Usage: + // + // typename parser_result<ParserT, ScannerT>::type + // + /////////////////////////////////////////////////////////////////////////// + template <typename ParserT, typename ScannerT> + struct parser_result + { + typedef typename boost::remove_reference<ParserT>::type parser_type; + typedef typename parser_type::template result<ScannerT>::type type; + }; + + /////////////////////////////////////////////////////////////////////////// + // + // parser class + // + // This class is a protocol base class for all parsers. This is + // essentially an interface contract. The parser class does not + // really know how to parse anything but instead relies on the + // template parameter DerivedT (which obviously is assumed to be a + // subclass) to do the actual parsing. + // + // Concrete sub-classes inheriting from parser must have a + // corresponding member function parse(...) compatible with the + // conceptual Interface: + // + // template <typename ScannerT> + // RT parse(ScannerT const& scan) const; + // + // where RT is the desired return type of the parser and ScannerT + // scan is the scanner (see scanner.hpp). + // + // Concrete sub-classes inheriting from parser in most cases need to + // have a nested meta-function result that returns the result type + // of the parser's parse member function, given a scanner type. The + // meta-function has the form: + // + // template <typename ScannerT> + // struct result + // { + // typedef RT type; + // }; + // + // where RT is the desired return type of the parser. This is + // usually, but not always, dependent on the template parameter + // ScannerT. If a parser does not supply a result metafunction, a + // default is provided by the base parser class. + // + // The parser's derived() member function returns a reference to the + // parser as its derived object. + // + // An operator[] is provided. The operator returns a semantic action + // handler (see actions.hpp). + // + // Each parser has a typedef embed_t. This typedef specifies how a + // parser is embedded in a composite (see composite.hpp). By + // default, if one is not specified, the parser will be embedded by + // value. That is, a copy of the parser is placed as a member + // variable of the composite. Most parsers are embedded by value. In + // certain situations however, this is not desirable or possible. + // + /////////////////////////////////////////////////////////////////////////// + template <typename DerivedT> + struct parser + { + typedef DerivedT embed_t; + typedef DerivedT derived_t; + typedef plain_parser_category parser_category_t; + + template <typename ScannerT> + struct result + { + typedef typename match_result<ScannerT, nil_t>::type type; + }; + + DerivedT& derived() + { + return *static_cast<DerivedT*>(this); + } + + DerivedT const& derived() const + { + return *static_cast<DerivedT const*>(this); + } + + template <typename ActionT> + action<DerivedT, ActionT> + operator[](ActionT const& actor) const + { + return action<DerivedT, ActionT>(derived(), actor); + } + }; + + /////////////////////////////////////////////////////////////////////////// + // + // parse_info + // + // Results returned by the free parse functions: + // + // stop: points to the final parse position (i.e parsing + // processed the input up to this point). + // + // hit: true if parsing is successful. This may be full: + // the parser consumed all the input, or partial: + // the parser consumed only a portion of the input. + // + // full: true when we have a full hit (i.e the parser + // consumed all the input. + // + // length: The number of characters consumed by the parser. + // This is valid only if we have a successful hit + // (either partial or full). + // + /////////////////////////////////////////////////////////////////////////// + template <typename IteratorT = char const*> + struct parse_info + { + IteratorT stop; + bool hit; + bool full; + std::size_t length; + + parse_info( + IteratorT const& stop_ = IteratorT(), + bool hit_ = false, + bool full_ = false, + std::size_t length_ = 0) + : stop(stop_) + , hit(hit_) + , full(full_) + , length(length_) {} + + template <typename ParseInfoT> + parse_info(ParseInfoT const& pi) + : stop(pi.stop) + , hit(pi.hit) + , full(pi.full) + , length(pi.length) {} + }; + + /////////////////////////////////////////////////////////////////////////// + // + // Generic parse function + // + /////////////////////////////////////////////////////////////////////////// + template <typename IteratorT, typename DerivedT> + parse_info<IteratorT> + parse( + IteratorT const& first, + IteratorT const& last, + parser<DerivedT> const& p); + + /////////////////////////////////////////////////////////////////////////// + // + // Parse function for null terminated strings + // + /////////////////////////////////////////////////////////////////////////// + template <typename CharT, typename DerivedT> + parse_info<CharT const*> + parse( + CharT const* str, + parser<DerivedT> const& p); + +BOOST_SPIRIT_CLASSIC_NAMESPACE_END + +}} // namespace BOOST_SPIRIT_CLASSIC_NS + +#endif + +#include <boost/spirit/home/classic/core/impl/parser.ipp> |