boost/spirit/home/karma/string/lit.hpp
// Copyright (c) 2001-2011 Hartmut Kaiser // Copyright (c) 2010 Bryce Lelbach // // 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_KARMA_LIT_FEB_22_2007_0534PM) #define BOOST_SPIRIT_KARMA_LIT_FEB_22_2007_0534PM #if defined(_MSC_VER) #pragma once #endif #include <boost/spirit/home/support/common_terminals.hpp> #include <boost/spirit/home/support/string_traits.hpp> #include <boost/spirit/home/support/info.hpp> #include <boost/spirit/home/support/char_class.hpp> #include <boost/spirit/home/support/container.hpp> #include <boost/spirit/home/support/handles_container.hpp> #include <boost/spirit/home/support/detail/get_encoding.hpp> #include <boost/spirit/home/karma/domain.hpp> #include <boost/spirit/home/karma/meta_compiler.hpp> #include <boost/spirit/home/karma/delimit_out.hpp> #include <boost/spirit/home/karma/auxiliary/lazy.hpp> #include <boost/spirit/home/karma/detail/get_casetag.hpp> #include <boost/spirit/home/karma/detail/extract_from.hpp> #include <boost/spirit/home/karma/detail/string_generate.hpp> #include <boost/spirit/home/karma/detail/string_compare.hpp> #include <boost/spirit/home/karma/detail/enable_lit.hpp> #include <boost/fusion/include/at.hpp> #include <boost/fusion/include/vector.hpp> #include <boost/fusion/include/cons.hpp> #include <boost/mpl/if.hpp> #include <boost/mpl/or.hpp> #include <boost/mpl/assert.hpp> #include <boost/mpl/bool.hpp> #include <boost/utility/enable_if.hpp> #include <string> /////////////////////////////////////////////////////////////////////////////// namespace boost { namespace spirit { /////////////////////////////////////////////////////////////////////////// // Enablers /////////////////////////////////////////////////////////////////////////// template <typename CharEncoding> struct use_terminal<karma::domain , tag::char_code<tag::string, CharEncoding> > // enables string : mpl::true_ {}; template <typename T> struct use_terminal<karma::domain, T , typename enable_if<traits::is_string<T> >::type> // enables string literals : mpl::true_ {}; template <typename CharEncoding, typename A0> struct use_terminal<karma::domain , terminal_ex< tag::char_code<tag::string, CharEncoding> // enables string(str) , fusion::vector1<A0> > > : traits::is_string<A0> {}; template <typename CharEncoding> // enables string(f) struct use_lazy_terminal< karma::domain , tag::char_code<tag::string, CharEncoding> , 1 /*arity*/ > : mpl::true_ {}; // enables lit(str) template <typename A0> struct use_terminal<karma::domain , terminal_ex<tag::lit, fusion::vector1<A0> > , typename enable_if<traits::is_string<A0> >::type> : mpl::true_ {}; }} /////////////////////////////////////////////////////////////////////////////// namespace boost { namespace spirit { namespace karma { #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS using spirit::lit; #endif using spirit::lit_type; /////////////////////////////////////////////////////////////////////////// // generate literal strings from a given parameter /////////////////////////////////////////////////////////////////////////// template <typename CharEncoding, typename Tag> struct any_string : primitive_generator<any_string<CharEncoding, Tag> > { typedef typename CharEncoding::char_type char_type; typedef CharEncoding char_encoding; template <typename Context, typename Unused = unused_type> struct attribute { typedef std::basic_string<char_type> type; }; // lit has an attached attribute template <typename OutputIterator, typename Context, typename Delimiter , typename Attribute> static bool generate(OutputIterator& sink, Context& context, Delimiter const& d, Attribute const& attr) { if (!traits::has_optional_value(attr)) return false; typedef typename attribute<Context>::type attribute_type; return karma::detail::string_generate(sink , traits::extract_from<attribute_type>(attr, context) , char_encoding(), Tag()) && karma::delimit_out(sink, d); // always do post-delimiting } // this lit has no attribute attached, it needs to have been // initialized from a direct literal template <typename OutputIterator, typename Context, typename Delimiter> static bool generate(OutputIterator&, Context&, Delimiter const&, unused_type const&) { // It is not possible (doesn't make sense) to use string without // providing any attribute, as the generator doesn't 'know' what // character to output. The following assertion fires if this // situation is detected in your code. BOOST_SPIRIT_ASSERT_FAIL(OutputIterator, string_not_usable_without_attribute, ()); return false; } template <typename Context> static info what(Context const& /*context*/) { return info("any-string"); } }; /////////////////////////////////////////////////////////////////////////// // generate literal strings /////////////////////////////////////////////////////////////////////////// template <typename String, typename CharEncoding, typename Tag, bool no_attribute> struct literal_string : primitive_generator<literal_string<String, CharEncoding, Tag, no_attribute> > { typedef CharEncoding char_encoding; typedef typename remove_const<typename traits::char_type_of<String>::type>::type char_type; typedef std::basic_string<char_type> string_type; template <typename Context, typename Unused = unused_type> struct attribute : mpl::if_c<no_attribute, unused_type, string_type> {}; literal_string(typename add_reference<String>::type str) : str_(str) {} // A string("...") which additionally has an associated attribute emits // its immediate literal only if it matches the attribute, otherwise // it fails. template < typename OutputIterator, typename Context, typename Delimiter , typename Attribute> bool generate(OutputIterator& sink, Context& context , Delimiter const& d, Attribute const& attr) const { if (!traits::has_optional_value(attr)) return false; // fail if attribute isn't matched by immediate literal typedef typename attribute<Context>::type attribute_type; using spirit::traits::get_c_string; if (!detail::string_compare( get_c_string( traits::extract_from<attribute_type>(attr, context)) , get_c_string(str_), char_encoding(), Tag())) { return false; } return detail::string_generate(sink, str_, char_encoding(), Tag()) && karma::delimit_out(sink, d); // always do post-delimiting } // A string("...") without any associated attribute just emits its // immediate literal template <typename OutputIterator, typename Context, typename Delimiter> bool generate(OutputIterator& sink, Context&, Delimiter const& d , unused_type) const { return detail::string_generate(sink, str_, char_encoding(), Tag()) && karma::delimit_out(sink, d); // always do post-delimiting } template <typename Context> info what(Context const& /*context*/) const { return info("literal-string", str_); } string_type str_; }; /////////////////////////////////////////////////////////////////////////// // Generator generators: make_xxx function (objects) /////////////////////////////////////////////////////////////////////////// // string template <typename CharEncoding, typename Modifiers> struct make_primitive< tag::char_code<tag::string, CharEncoding> , Modifiers> { static bool const lower = has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value; static bool const upper = has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value; typedef any_string< typename spirit::detail::get_encoding_with_case< Modifiers, CharEncoding, lower || upper>::type , typename detail::get_casetag<Modifiers, lower || upper>::type > result_type; result_type operator()(unused_type, unused_type) const { return result_type(); } }; // string literal template <typename T, typename Modifiers> struct make_primitive<T, Modifiers , typename enable_if<traits::is_string<T> >::type> { static bool const lower = has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value; static bool const upper = has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value; typedef typename add_const<T>::type const_string; typedef literal_string< const_string , typename spirit::detail::get_encoding_with_case< Modifiers, unused_type, lower || upper>::type , typename detail::get_casetag<Modifiers, lower || upper>::type , true > result_type; result_type operator()( typename add_reference<const_string>::type str, unused_type) const { return result_type(str); } }; /////////////////////////////////////////////////////////////////////////// namespace detail { template <typename CharEncoding, typename Modifiers, typename A0 , bool no_attribute> struct make_string_direct { static bool const lower = has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value; static bool const upper = has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value; typedef typename add_const<A0>::type const_string; typedef literal_string< const_string , typename spirit::detail::get_encoding_with_case< Modifiers, unused_type, lower || upper>::type , typename detail::get_casetag<Modifiers, lower || upper>::type , no_attribute > result_type; template <typename Terminal> result_type operator()(Terminal const& term, unused_type) const { return result_type(fusion::at_c<0>(term.args)); } }; } // string("..."), lit("...") template <typename CharEncoding, typename Modifiers, typename A0> struct make_primitive< terminal_ex< tag::char_code<tag::string, CharEncoding> , fusion::vector1<A0> > , Modifiers> : detail::make_string_direct<CharEncoding, Modifiers, A0, false> {}; template <typename Modifiers, typename A0> struct make_primitive< terminal_ex<tag::lit, fusion::vector1<A0> > , Modifiers , typename enable_if<traits::is_string<A0> >::type> : detail::make_string_direct< typename traits::char_encoding_from_char< typename traits::char_type_of<A0>::type>::type , Modifiers, A0, true> {}; }}} // namespace boost::spirit::karma namespace boost { namespace spirit { namespace traits { /////////////////////////////////////////////////////////////////////////// template <typename CharEncoding, typename Tag, typename Attribute , typename Context, typename Iterator> struct handles_container<karma::any_string<CharEncoding, Tag>, Attribute , Context, Iterator> : mpl::false_ {}; template <typename String, typename CharEncoding, typename Tag , bool no_attribute, typename Attribute, typename Context , typename Iterator> struct handles_container<karma::literal_string<String, CharEncoding, Tag , no_attribute>, Attribute, Context, Iterator> : mpl::false_ {}; }}} #endif