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338 lines
11 KiB
338 lines
11 KiB
/*============================================================================= |
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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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#if !defined(SPIRIT_QI_BOOL_SEP_29_2009_0709AM) |
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#define SPIRIT_QI_BOOL_SEP_29_2009_0709AM |
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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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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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