| // Copyright (c) 2001-2011 Hartmut Kaiser | |
| // | |
| // 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_COLUMNS_DEC_03_2009_0736AM) | |
| #define BOOST_SPIRIT_KARMA_COLUMNS_DEC_03_2009_0736AM | |
| #if defined(_MSC_VER) | |
| #pragma once | |
| #endif | |
| #include <boost/spirit/home/karma/meta_compiler.hpp> | |
| #include <boost/spirit/home/karma/generator.hpp> | |
| #include <boost/spirit/home/karma/domain.hpp> | |
| #include <boost/spirit/home/karma/delimit_out.hpp> | |
| #include <boost/spirit/home/karma/detail/default_width.hpp> | |
| #include <boost/spirit/home/karma/auxiliary/eol.hpp> | |
| #include <boost/spirit/home/karma/auxiliary/lazy.hpp> | |
| #include <boost/spirit/home/support/unused.hpp> | |
| #include <boost/spirit/home/support/common_terminals.hpp> | |
| #include <boost/spirit/home/support/has_semantic_action.hpp> | |
| #include <boost/spirit/home/support/handles_container.hpp> | |
| #include <boost/spirit/home/karma/detail/attributes.hpp> | |
| #include <boost/spirit/home/support/info.hpp> | |
| #include <boost/fusion/include/at.hpp> | |
| #include <boost/fusion/include/vector.hpp> | |
| namespace boost { namespace spirit | |
| { | |
| /////////////////////////////////////////////////////////////////////////// | |
| // Enablers | |
| /////////////////////////////////////////////////////////////////////////// | |
| template <> | |
| struct use_directive<karma::domain, tag::columns> // enables columns[] | |
| : mpl::true_ {}; | |
| // enables columns(c)[g], where c provides the number of require columns | |
| template <typename T> | |
| struct use_directive<karma::domain | |
| , terminal_ex<tag::columns, fusion::vector1<T> > > | |
| : mpl::true_ {}; | |
| // enables *lazy* columns(c)[g] | |
| template <> | |
| struct use_lazy_directive<karma::domain, tag::columns, 1> | |
| : mpl::true_ {}; | |
| // enables columns(c, d)[g], where c provides the number of require columns | |
| // and d is the custom column-delimiter (default is karma::endl) | |
| template <typename T1, typename T2> | |
| struct use_directive<karma::domain | |
| , terminal_ex<tag::columns, fusion::vector2<T1, T2> > > | |
| : boost::spirit::traits::matches<karma::domain, T2> {}; | |
| // enables *lazy* columns(c, d)[g] | |
| template <> | |
| struct use_lazy_directive<karma::domain, tag::columns, 2> | |
| : mpl::true_ {}; | |
| }} | |
| namespace boost { namespace spirit { namespace karma | |
| { | |
| using spirit::columns; | |
| using spirit::columns_type; | |
| namespace detail | |
| { | |
| template <typename Delimiter, typename ColumnDelimiter> | |
| struct columns_delimiter | |
| { | |
| columns_delimiter(Delimiter const& delim | |
| , ColumnDelimiter const& cdelim, unsigned int const numcols) | |
| : delimiter(delim), column_delimiter(cdelim) | |
| , numcolumns(numcols), count(0) {} | |
| template <typename OutputIterator, typename Context | |
| , typename Delimiter_, typename Attribute> | |
| bool generate(OutputIterator& sink, Context&, Delimiter_ const& | |
| , Attribute const&) const | |
| { | |
| // first invoke the embedded delimiter | |
| if (!karma::delimit_out(sink, delimiter)) | |
| return false; | |
| // now we count the number of invocations and emit the column | |
| // delimiter if needed | |
| if ((++count % numcolumns) == 0) | |
| return karma::delimit_out(sink, column_delimiter); | |
| return true; | |
| } | |
| // generate a final column delimiter if the last invocation didn't | |
| // emit one | |
| template <typename OutputIterator> | |
| bool delimit_out(OutputIterator& sink) const | |
| { | |
| if (count % numcolumns) | |
| return karma::delimit_out(sink, column_delimiter); | |
| return true; | |
| } | |
| Delimiter const& delimiter; | |
| ColumnDelimiter const& column_delimiter; | |
| unsigned int const numcolumns; | |
| mutable unsigned int count; | |
| private: | |
| // silence MSVC warning C4512: assignment operator could not be generated | |
| columns_delimiter& operator= (columns_delimiter const&); | |
| }; | |
| } | |
| /////////////////////////////////////////////////////////////////////////// | |
| // The columns_generator is used for columns(c, d)[...] directives. | |
| /////////////////////////////////////////////////////////////////////////// | |
| template <typename Subject, typename NumColumns, typename ColumnsDelimiter> | |
| struct columns_generator | |
| : unary_generator<columns_generator<Subject, NumColumns, ColumnsDelimiter> > | |
| { | |
| typedef Subject subject_type; | |
| typedef ColumnsDelimiter delimiter_type; | |
| typedef mpl::int_< | |
| subject_type::properties::value | delimiter_type::properties::value | |
| > properties; | |
| template <typename Context, typename Iterator> | |
| struct attribute | |
| : traits::attribute_of<subject_type, Context, Iterator> | |
| {}; | |
| columns_generator(Subject const& subject, NumColumns const& cols | |
| , ColumnsDelimiter const& cdelimiter) | |
| : subject(subject), numcolumns(cols), column_delimiter(cdelimiter) | |
| { | |
| // having zero number of columns doesn't make any sense | |
| BOOST_ASSERT(numcolumns > 0); | |
| } | |
| template <typename OutputIterator, typename Context | |
| , typename Delimiter, typename Attribute> | |
| bool generate(OutputIterator& sink, Context& ctx | |
| , Delimiter const& delimiter, Attribute const& attr) const | |
| { | |
| // The columns generator dispatches to the embedded generator | |
| // while supplying a new delimiter to use, wrapping the outer | |
| // delimiter. | |
| typedef detail::columns_delimiter< | |
| Delimiter, ColumnsDelimiter | |
| > columns_delimiter_type; | |
| columns_delimiter_type d(delimiter, column_delimiter, numcolumns); | |
| return subject.generate(sink, ctx, d, attr) && d.delimit_out(sink); | |
| } | |
| template <typename Context> | |
| info what(Context& context) const | |
| { | |
| return info("columns", subject.what(context)); | |
| } | |
| Subject subject; | |
| NumColumns numcolumns; | |
| ColumnsDelimiter column_delimiter; | |
| }; | |
| /////////////////////////////////////////////////////////////////////////// | |
| // Generator generators: make_xxx function (objects) | |
| /////////////////////////////////////////////////////////////////////////// | |
| // creates columns[] directive | |
| template <typename Subject, typename Modifiers> | |
| struct make_directive<tag::columns, Subject, Modifiers> | |
| { | |
| typedef typename | |
| result_of::compile<karma::domain, eol_type, Modifiers>::type | |
| columns_delimiter_type; | |
| typedef columns_generator< | |
| Subject, detail::default_columns, columns_delimiter_type> | |
| result_type; | |
| result_type operator()(unused_type, Subject const& subject | |
| , unused_type) const | |
| { | |
| return result_type(subject, detail::default_columns() | |
| , compile<karma::domain>(eol)); | |
| } | |
| }; | |
| // creates columns(c)[] directive generator (c is the number of columns) | |
| template <typename T, typename Subject, typename Modifiers> | |
| struct make_directive< | |
| terminal_ex<tag::columns, fusion::vector1<T> > | |
| , Subject, Modifiers | |
| , typename enable_if_c<integer_traits<T>::is_integral>::type> | |
| { | |
| typedef typename | |
| result_of::compile<karma::domain, eol_type, Modifiers>::type | |
| columns_delimiter_type; | |
| typedef columns_generator< | |
| Subject, T, columns_delimiter_type | |
| > result_type; | |
| template <typename Terminal> | |
| result_type operator()(Terminal const& term, Subject const& subject | |
| , unused_type) const | |
| { | |
| return result_type(subject, fusion::at_c<0>(term.args) | |
| , compile<karma::domain>(eol)); | |
| } | |
| }; | |
| // creates columns(d)[] directive generator (d is the column delimiter) | |
| template <typename T, typename Subject, typename Modifiers> | |
| struct make_directive< | |
| terminal_ex<tag::columns, fusion::vector1<T> > | |
| , Subject, Modifiers | |
| , typename enable_if< | |
| mpl::and_< | |
| spirit::traits::matches<karma::domain, T>, | |
| mpl::not_<mpl::bool_<integer_traits<T>::is_integral> > | |
| > | |
| >::type> | |
| { | |
| typedef typename | |
| result_of::compile<karma::domain, T, Modifiers>::type | |
| columns_delimiter_type; | |
| typedef columns_generator< | |
| Subject, detail::default_columns, columns_delimiter_type | |
| > result_type; | |
| template <typename Terminal> | |
| result_type operator()(Terminal const& term, Subject const& subject | |
| , unused_type) const | |
| { | |
| return result_type(subject, detail::default_columns() | |
| , compile<karma::domain>(fusion::at_c<0>(term.args))); | |
| } | |
| }; | |
| // creates columns(c, d)[] directive generator (c is the number of columns | |
| // and d is the column delimiter) | |
| template <typename T1, typename T2, typename Subject, typename Modifiers> | |
| struct make_directive< | |
| terminal_ex<tag::columns, fusion::vector2<T1, T2> > | |
| , Subject, Modifiers> | |
| { | |
| typedef typename | |
| result_of::compile<karma::domain, T2, Modifiers>::type | |
| columns_delimiter_type; | |
| typedef columns_generator< | |
| Subject, T1, columns_delimiter_type | |
| > result_type; | |
| template <typename Terminal> | |
| result_type operator()(Terminal const& term, Subject const& subject | |
| , unused_type) const | |
| { | |
| return result_type (subject, fusion::at_c<0>(term.args) | |
| , compile<karma::domain>(fusion::at_c<1>(term.args))); | |
| } | |
| }; | |
| }}} | |
| namespace boost { namespace spirit { namespace traits | |
| { | |
| /////////////////////////////////////////////////////////////////////////// | |
| template <typename Subject, typename T1, typename T2> | |
| struct has_semantic_action<karma::columns_generator<Subject, T1, T2> > | |
| : unary_has_semantic_action<Subject> {}; | |
| /////////////////////////////////////////////////////////////////////////// | |
| template <typename Subject, typename T1, typename T2, typename Attribute | |
| , typename Context, typename Iterator> | |
| struct handles_container< | |
| karma::columns_generator<Subject, T1, T2>, Attribute | |
| , Context, Iterator> | |
| : unary_handles_container<Subject, Attribute, Context, Iterator> {}; | |
| }}} | |
| #endif |