339 lines
11 KiB
C++
339 lines
11 KiB
C++
/*=============================================================================
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Copyright (c) 2001-2011 Hartmut Kaiser
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Copyright (c) 2011 Bryce Lelbach
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#ifndef BOOST_SPIRIT_QI_NUMERIC_BOOL_HPP
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#define BOOST_SPIRIT_QI_NUMERIC_BOOL_HPP
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/spirit/home/qi/skip_over.hpp>
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#include <boost/spirit/home/qi/detail/enable_lit.hpp>
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#include <boost/spirit/home/qi/meta_compiler.hpp>
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#include <boost/spirit/home/qi/parser.hpp>
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#include <boost/spirit/home/qi/numeric/bool_policies.hpp>
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#include <boost/spirit/home/support/common_terminals.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/detail/workaround.hpp>
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#include <boost/type_traits/is_same.hpp>
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namespace boost { namespace spirit
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{
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namespace qi
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{
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///////////////////////////////////////////////////////////////////////
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// forward declaration only
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template <typename T>
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struct bool_policies;
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///////////////////////////////////////////////////////////////////////
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// This is the class that the user can instantiate directly in
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// order to create a customized bool parser
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template <typename T, typename BoolPolicies = bool_policies<T> >
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struct bool_parser
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: spirit::terminal<tag::stateful_tag<BoolPolicies, tag::bool_, T> >
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{
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typedef tag::stateful_tag<BoolPolicies, tag::bool_, T> tag_type;
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bool_parser() {}
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bool_parser(BoolPolicies const& data)
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: spirit::terminal<tag_type>(data) {}
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};
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}
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///////////////////////////////////////////////////////////////////////////
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// Enablers
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///////////////////////////////////////////////////////////////////////////
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template <> // enables bool_
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struct use_terminal<qi::domain, tag::bool_>
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: mpl::true_ {};
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template <> // enables true_
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struct use_terminal<qi::domain, tag::true_>
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: mpl::true_ {};
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template <> // enables false_
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struct use_terminal<qi::domain, tag::false_>
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: mpl::true_ {};
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///////////////////////////////////////////////////////////////////////////
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template <typename A0> // enables lit(...)
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struct use_terminal<qi::domain
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, terminal_ex<tag::lit, fusion::vector1<A0> >
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, typename enable_if<is_same<A0, bool> >::type>
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: mpl::true_ {};
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///////////////////////////////////////////////////////////////////////////
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template <typename A0> // enables bool_(...)
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struct use_terminal<qi::domain
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, terminal_ex<tag::bool_, fusion::vector1<A0> >
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> : mpl::true_ {};
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template <> // enables *lazy* bool_(...)
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struct use_lazy_terminal<qi::domain, tag::bool_, 1>
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: mpl::true_ {};
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///////////////////////////////////////////////////////////////////////////
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// enables any custom bool_parser
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template <typename T, typename BoolPolicies>
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struct use_terminal<qi::domain
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, tag::stateful_tag<BoolPolicies, tag::bool_, T> >
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: mpl::true_ {};
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// enables any custom bool_parser(...)
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template <typename T, typename BoolPolicies, typename A0>
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struct use_terminal<qi::domain
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, terminal_ex<tag::stateful_tag<BoolPolicies, tag::bool_, T>
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, fusion::vector1<A0> > >
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: mpl::true_ {};
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// enables *lazy* custom bool_parser(...)
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template <typename T, typename BoolPolicies>
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struct use_lazy_terminal<
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qi::domain
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, tag::stateful_tag<BoolPolicies, tag::bool_, T>
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, 1 // arity
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> : mpl::true_ {};
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}}
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namespace boost { namespace spirit { namespace qi
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{
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#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
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using spirit::bool_;
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using spirit::true_;
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using spirit::false_;
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using spirit::lit; // lit(true) is equivalent to true
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#endif
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using spirit::bool_type;
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using spirit::true_type;
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using spirit::false_type;
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using spirit::lit_type;
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namespace detail
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{
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template <typename T, typename BoolPolicies>
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struct bool_impl
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{
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template <typename Iterator, typename Attribute>
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static bool parse(Iterator& first, Iterator const& last
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, Attribute& attr, BoolPolicies const& p, bool allow_true = true
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, bool disallow_false = false)
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{
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if (first == last)
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return false;
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#if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1600))
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(void)p; // suppresses warning: C4100: 'p' : unreferenced formal parameter
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#endif
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return (allow_true && p.parse_true(first, last, attr)) ||
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(!disallow_false && p.parse_false(first, last, attr));
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}
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};
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}
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///////////////////////////////////////////////////////////////////////////
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// This actual boolean parser
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///////////////////////////////////////////////////////////////////////////
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template <typename T, typename BoolPolicies = bool_policies<T> >
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struct any_bool_parser
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: primitive_parser<any_bool_parser<T, BoolPolicies> >
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{
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template <typename Context, typename Iterator>
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struct attribute
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{
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typedef T type;
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};
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template <typename Iterator, typename Context
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, typename Skipper, typename Attribute>
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bool parse(Iterator& first, Iterator const& last
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, Context& /*context*/, Skipper const& skipper
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, Attribute& attr_) const
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{
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typedef detail::bool_impl<T, BoolPolicies> extract;
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qi::skip_over(first, last, skipper);
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return extract::parse(first, last, attr_, BoolPolicies());
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}
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template <typename Context>
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info what(Context& /*context*/) const
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{
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return info("boolean");
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}
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};
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template <typename T, typename BoolPolicies = bool_policies<T>
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, bool no_attribute = true>
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struct literal_bool_parser
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: primitive_parser<literal_bool_parser<T, BoolPolicies, no_attribute> >
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{
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template <typename Value>
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literal_bool_parser(Value const& n) : n_(n) {}
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template <typename Context, typename Iterator>
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struct attribute
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: mpl::if_c<no_attribute, unused_type, T>
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{};
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template <typename Iterator, typename Context
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, typename Skipper, typename Attribute>
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bool parse(Iterator& first, Iterator const& last
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, Context& /*context*/, Skipper const& skipper
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, Attribute& attr_) const
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{
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typedef detail::bool_impl<T, BoolPolicies> extract;
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qi::skip_over(first, last, skipper);
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return extract::parse(first, last, attr_, BoolPolicies(), n_, n_);
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}
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template <typename Context>
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info what(Context& /*context*/) const
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{
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return info("boolean");
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}
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T n_;
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};
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///////////////////////////////////////////////////////////////////////////
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// Parser generators: make_xxx function (objects)
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///////////////////////////////////////////////////////////////////////////
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template <typename T, typename Modifiers
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, typename Policies = bool_policies<T> >
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struct make_bool
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{
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typedef has_modifier<Modifiers, tag::char_code_base<tag::no_case> >
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no_case;
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typedef typename mpl::if_<
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mpl::and_<
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no_case
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, is_same<bool_policies<T>, Policies>
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>
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, any_bool_parser<T, no_case_bool_policies<T> >
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, any_bool_parser<T, Policies> >::type
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result_type;
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result_type operator()(unused_type, unused_type) const
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{
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return result_type();
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}
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};
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template <typename T, typename Modifiers
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, typename Policies = bool_policies<T> >
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struct make_direct_bool
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{
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typedef has_modifier<Modifiers, tag::char_code_base<tag::no_case> >
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no_case;
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typedef typename mpl::if_<
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mpl::and_<
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no_case
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, is_same<bool_policies<T>, Policies>
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>
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, literal_bool_parser<T, no_case_bool_policies<T>, false>
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, literal_bool_parser<T, Policies, false> >::type
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result_type;
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template <typename Terminal>
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result_type operator()(Terminal const& term, unused_type) const
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{
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return result_type(fusion::at_c<0>(term.args));
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}
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};
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template <typename T, typename Modifiers, bool b
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, typename Policies = bool_policies<T> >
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struct make_predefined_direct_bool
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{
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typedef has_modifier<Modifiers, tag::char_code_base<tag::no_case> >
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no_case;
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typedef typename mpl::if_<
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mpl::and_<
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no_case
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, is_same<bool_policies<T>, Policies>
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>
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, literal_bool_parser<T, no_case_bool_policies<T>, false>
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, literal_bool_parser<T, Policies, false> >::type
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result_type;
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result_type operator()(unused_type, unused_type) const
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{
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return result_type(b);
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}
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};
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template <typename T, typename Modifiers
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, typename Policies = bool_policies<T> >
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struct make_literal_bool
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{
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typedef has_modifier<Modifiers, tag::char_code_base<tag::no_case> >
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no_case;
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typedef typename mpl::if_<
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mpl::and_<
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no_case
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, is_same<bool_policies<T>, Policies>
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>
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, literal_bool_parser<T, no_case_bool_policies<T> >
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, literal_bool_parser<T, Policies> >::type
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result_type;
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template <typename Terminal>
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result_type operator()(Terminal const& term, unused_type) const
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{
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return result_type(fusion::at_c<0>(term.args));
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}
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};
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///////////////////////////////////////////////////////////////////////////
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template <typename Modifiers, typename A0>
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struct make_primitive<
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terminal_ex<tag::lit, fusion::vector1<A0> >
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, Modifiers, typename enable_if<is_same<A0, bool> >::type>
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: make_literal_bool<bool, Modifiers> {};
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///////////////////////////////////////////////////////////////////////////
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template <typename Modifiers>
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struct make_primitive<tag::false_, Modifiers>
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: make_predefined_direct_bool<bool, Modifiers, false>
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{};
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template <typename Modifiers>
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struct make_primitive<tag::true_, Modifiers>
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: make_predefined_direct_bool<bool, Modifiers, true>
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{};
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///////////////////////////////////////////////////////////////////////////
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template <typename T, typename Policies, typename Modifiers>
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struct make_primitive<
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tag::stateful_tag<Policies, tag::bool_, T>, Modifiers>
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: make_bool<T, Modifiers, Policies> {};
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template <typename T, typename Policies, typename A0, typename Modifiers>
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struct make_primitive<
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terminal_ex<tag::stateful_tag<Policies, tag::bool_, T>
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, fusion::vector1<A0> >, Modifiers>
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: make_direct_bool<T, Modifiers, Policies> {};
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///////////////////////////////////////////////////////////////////////////
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template <typename Modifiers>
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struct make_primitive<tag::bool_, Modifiers>
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: make_bool<bool, Modifiers> {};
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template <typename Modifiers, typename A0>
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struct make_primitive<
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terminal_ex<tag::bool_
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, fusion::vector1<A0> >, Modifiers>
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: make_direct_bool<bool, Modifiers> {};
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}}}
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#endif
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