| /*============================================================================= |
| Copyright (c) 2001-2011 Hartmut Kaiser |
| Copyright (c) 2011 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(SPIRIT_QI_BOOL_SEP_29_2009_0709AM) |
| #define SPIRIT_QI_BOOL_SEP_29_2009_0709AM |
| |
| #if defined(_MSC_VER) |
| #pragma once |
| #endif |
| |
| #include <boost/spirit/home/qi/skip_over.hpp> |
| #include <boost/spirit/home/qi/detail/enable_lit.hpp> |
| #include <boost/spirit/home/qi/meta_compiler.hpp> |
| #include <boost/spirit/home/qi/parser.hpp> |
| #include <boost/spirit/home/qi/numeric/bool_policies.hpp> |
| #include <boost/spirit/home/support/common_terminals.hpp> |
| #include <boost/mpl/assert.hpp> |
| #include <boost/detail/workaround.hpp> |
| #include <boost/type_traits/is_same.hpp> |
| |
| namespace boost { namespace spirit |
| { |
| namespace qi |
| { |
| /////////////////////////////////////////////////////////////////////// |
| // forward declaration only |
| template <typename T> |
| struct bool_policies; |
| |
| /////////////////////////////////////////////////////////////////////// |
| // This is the class that the user can instantiate directly in |
| // order to create a customized bool parser |
| template <typename T, typename BoolPolicies = bool_policies<T> > |
| struct bool_parser |
| : spirit::terminal<tag::stateful_tag<BoolPolicies, tag::bool_, T> > |
| { |
| typedef tag::stateful_tag<BoolPolicies, tag::bool_, T> tag_type; |
| |
| bool_parser() {} |
| bool_parser(BoolPolicies const& data) |
| : spirit::terminal<tag_type>(data) {} |
| }; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // Enablers |
| /////////////////////////////////////////////////////////////////////////// |
| template <> // enables bool_ |
| struct use_terminal<qi::domain, tag::bool_> |
| : mpl::true_ {}; |
| |
| template <> // enables true_ |
| struct use_terminal<qi::domain, tag::true_> |
| : mpl::true_ {}; |
| |
| template <> // enables false_ |
| struct use_terminal<qi::domain, tag::false_> |
| : mpl::true_ {}; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename A0> // enables lit(...) |
| struct use_terminal<qi::domain |
| , terminal_ex<tag::lit, fusion::vector1<A0> > |
| , typename enable_if<is_same<A0, bool> >::type> |
| : mpl::true_ {}; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename A0> // enables bool_(...) |
| struct use_terminal<qi::domain |
| , terminal_ex<tag::bool_, fusion::vector1<A0> > |
| > : mpl::true_ {}; |
| |
| template <> // enables *lazy* bool_(...) |
| struct use_lazy_terminal<qi::domain, tag::bool_, 1> |
| : mpl::true_ {}; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // enables any custom bool_parser |
| template <typename T, typename BoolPolicies> |
| struct use_terminal<qi::domain |
| , tag::stateful_tag<BoolPolicies, tag::bool_, T> > |
| : mpl::true_ {}; |
| |
| // enables any custom bool_parser(...) |
| template <typename T, typename BoolPolicies, typename A0> |
| struct use_terminal<qi::domain |
| , terminal_ex<tag::stateful_tag<BoolPolicies, tag::bool_, T> |
| , fusion::vector1<A0> > > |
| : mpl::true_ {}; |
| |
| // enables *lazy* custom bool_parser(...) |
| template <typename T, typename BoolPolicies> |
| struct use_lazy_terminal< |
| qi::domain |
| , tag::stateful_tag<BoolPolicies, tag::bool_, T> |
| , 1 // arity |
| > : mpl::true_ {}; |
| }} |
| |
| namespace boost { namespace spirit { namespace qi |
| { |
| #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS |
| using spirit::bool_; |
| using spirit::true_; |
| using spirit::false_; |
| using spirit::lit; // lit(true) is equivalent to true |
| #endif |
| using spirit::bool_type; |
| using spirit::true_type; |
| using spirit::false_type; |
| using spirit::lit_type; |
| |
| namespace detail |
| { |
| template <typename T, typename BoolPolicies> |
| struct bool_impl |
| { |
| template <typename Iterator, typename Attribute> |
| static bool parse(Iterator& first, Iterator const& last |
| , Attribute& attr, BoolPolicies const& p, bool allow_true = true |
| , bool disallow_false = false) |
| { |
| if (first == last) |
| return false; |
| |
| #if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1600)) |
| p; // suppresses warning: C4100: 'p' : unreferenced formal parameter |
| #endif |
| return (allow_true && p.parse_true(first, last, attr)) || |
| (!disallow_false && p.parse_false(first, last, attr)); |
| } |
| }; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // This actual boolean parser |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename T, typename BoolPolicies = bool_policies<T> > |
| struct any_bool_parser |
| : primitive_parser<any_bool_parser<T, BoolPolicies> > |
| { |
| template <typename Context, typename Iterator> |
| struct attribute |
| { |
| typedef T type; |
| }; |
| |
| template <typename Iterator, typename Context |
| , typename Skipper, typename Attribute> |
| bool parse(Iterator& first, Iterator const& last |
| , Context& /*context*/, Skipper const& skipper |
| , Attribute& attr) const |
| { |
| typedef detail::bool_impl<T, BoolPolicies> extract; |
| qi::skip_over(first, last, skipper); |
| return extract::parse(first, last, attr, BoolPolicies()); |
| } |
| |
| template <typename Context> |
| info what(Context& /*context*/) const |
| { |
| return info("boolean"); |
| } |
| }; |
| |
| template <typename T, typename BoolPolicies = bool_policies<T> |
| , bool no_attribute = true> |
| struct literal_bool_parser |
| : primitive_parser<literal_bool_parser<T, BoolPolicies, no_attribute> > |
| { |
| template <typename Value> |
| literal_bool_parser(Value const& n) : n_(n) {} |
| |
| template <typename Context, typename Iterator> |
| struct attribute |
| : mpl::if_c<no_attribute, unused_type, T> |
| {}; |
| |
| template <typename Iterator, typename Context |
| , typename Skipper, typename Attribute> |
| bool parse(Iterator& first, Iterator const& last |
| , Context& /*context*/, Skipper const& skipper |
| , Attribute& attr) const |
| { |
| typedef detail::bool_impl<T, BoolPolicies> extract; |
| qi::skip_over(first, last, skipper); |
| return extract::parse(first, last, attr, BoolPolicies(), n_, n_); |
| } |
| |
| template <typename Context> |
| info what(Context& /*context*/) const |
| { |
| return info("boolean"); |
| } |
| |
| T n_; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // Parser generators: make_xxx function (objects) |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename T, typename Modifiers |
| , typename Policies = bool_policies<T> > |
| struct make_bool |
| { |
| typedef has_modifier<Modifiers, tag::char_code_base<tag::no_case> > |
| no_case; |
| |
| typedef typename mpl::if_< |
| mpl::and_< |
| no_case |
| , is_same<bool_policies<T>, Policies> |
| > |
| , any_bool_parser<T, no_case_bool_policies<T> > |
| , any_bool_parser<T, Policies> >::type |
| result_type; |
| |
| result_type operator()(unused_type, unused_type) const |
| { |
| return result_type(); |
| } |
| }; |
| |
| template <typename T, typename Modifiers |
| , typename Policies = bool_policies<T> > |
| struct make_direct_bool |
| { |
| typedef has_modifier<Modifiers, tag::char_code_base<tag::no_case> > |
| no_case; |
| |
| typedef typename mpl::if_< |
| mpl::and_< |
| no_case |
| , is_same<bool_policies<T>, Policies> |
| > |
| , literal_bool_parser<T, no_case_bool_policies<T>, false> |
| , literal_bool_parser<T, Policies, false> >::type |
| result_type; |
| |
| template <typename Terminal> |
| result_type operator()(Terminal const& term, unused_type) const |
| { |
| return result_type(fusion::at_c<0>(term.args)); |
| } |
| }; |
| |
| template <typename T, typename Modifiers, bool b |
| , typename Policies = bool_policies<T> > |
| struct make_predefined_direct_bool |
| { |
| typedef has_modifier<Modifiers, tag::char_code_base<tag::no_case> > |
| no_case; |
| |
| typedef typename mpl::if_< |
| mpl::and_< |
| no_case |
| , is_same<bool_policies<T>, Policies> |
| > |
| , literal_bool_parser<T, no_case_bool_policies<T>, false> |
| , literal_bool_parser<T, Policies, false> >::type |
| result_type; |
| |
| result_type operator()(unused_type, unused_type) const |
| { |
| return result_type(b); |
| } |
| }; |
| |
| template <typename T, typename Modifiers |
| , typename Policies = bool_policies<T> > |
| struct make_literal_bool |
| { |
| typedef has_modifier<Modifiers, tag::char_code_base<tag::no_case> > |
| no_case; |
| |
| typedef typename mpl::if_< |
| mpl::and_< |
| no_case |
| , is_same<bool_policies<T>, Policies> |
| > |
| , literal_bool_parser<T, no_case_bool_policies<T> > |
| , literal_bool_parser<T, Policies> >::type |
| result_type; |
| |
| template <typename Terminal> |
| result_type operator()(Terminal const& term, unused_type) const |
| { |
| return result_type(fusion::at_c<0>(term.args)); |
| } |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename Modifiers, typename A0> |
| struct make_primitive< |
| terminal_ex<tag::lit, fusion::vector1<A0> > |
| , Modifiers, typename enable_if<is_same<A0, bool> >::type> |
| : make_literal_bool<bool, Modifiers> {}; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename Modifiers> |
| struct make_primitive<tag::false_, Modifiers> |
| : make_predefined_direct_bool<bool, Modifiers, false> |
| {}; |
| |
| template <typename Modifiers> |
| struct make_primitive<tag::true_, Modifiers> |
| : make_predefined_direct_bool<bool, Modifiers, true> |
| {}; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename T, typename Policies, typename Modifiers> |
| struct make_primitive< |
| tag::stateful_tag<Policies, tag::bool_, T>, Modifiers> |
| : make_bool<T, Modifiers, Policies> {}; |
| |
| template <typename T, typename Policies, typename A0, typename Modifiers> |
| struct make_primitive< |
| terminal_ex<tag::stateful_tag<Policies, tag::bool_, T> |
| , fusion::vector1<A0> >, Modifiers> |
| : make_direct_bool<T, Modifiers, Policies> {}; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename Modifiers> |
| struct make_primitive<tag::bool_, Modifiers> |
| : make_bool<bool, Modifiers> {}; |
| |
| template <typename Modifiers, typename A0> |
| struct make_primitive< |
| terminal_ex<tag::bool_ |
| , fusion::vector1<A0> >, Modifiers> |
| : make_direct_bool<bool, Modifiers> {}; |
| }}} |
| |
| #endif |