You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and dots ('.'), can be up to 35 characters long. Letters must be lowercase.
267 lines
9.5 KiB
267 lines
9.5 KiB
// Copyright (c) 2001-2011 Hartmut Kaiser |
|
// Copyright (c) 2001-2011 Joel de Guzman |
|
// |
|
// 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_LAZY_MARCH_27_2007_1231PM) |
|
#define BOOST_SPIRIT_KARMA_LAZY_MARCH_27_2007_1231PM |
|
|
|
#if defined(_MSC_VER) |
|
#pragma once |
|
#endif |
|
|
|
#include <boost/spirit/home/karma/domain.hpp> |
|
#include <boost/spirit/home/karma/delimit_out.hpp> |
|
#include <boost/spirit/home/karma/meta_compiler.hpp> |
|
#include <boost/spirit/home/karma/detail/attributes.hpp> |
|
#include <boost/spirit/home/support/unused.hpp> |
|
#include <boost/spirit/home/support/info.hpp> |
|
#include <boost/spirit/home/support/lazy.hpp> |
|
#include <boost/spirit/include/phoenix_core.hpp> |
|
#include <boost/fusion/include/at.hpp> |
|
#include <boost/utility/result_of.hpp> |
|
#include <boost/type_traits/remove_reference.hpp> |
|
#include <boost/mpl/not.hpp> |
|
|
|
namespace boost { namespace spirit |
|
{ |
|
/////////////////////////////////////////////////////////////////////////// |
|
// Enablers |
|
/////////////////////////////////////////////////////////////////////////// |
|
template <typename Eval> |
|
struct use_terminal<karma::domain, phoenix::actor<Eval> > // enables phoenix actors |
|
: mpl::true_ {}; |
|
|
|
// forward declaration |
|
template <typename Terminal, typename Actor, int Arity> |
|
struct lazy_terminal; |
|
|
|
}} |
|
|
|
namespace boost { namespace spirit { namespace karma |
|
{ |
|
using spirit::lazy; |
|
typedef modify<karma::domain> karma_modify; |
|
|
|
namespace detail |
|
{ |
|
template <typename Generator, typename OutputIterator, typename Context |
|
, typename Delimiter, typename Attribute> |
|
bool lazy_generate_impl(Generator const& g, OutputIterator& sink |
|
, Context& context, Delimiter const& delim |
|
, Attribute const& attr, mpl::false_) |
|
{ |
|
return g.generate(sink, context, delim, attr); |
|
} |
|
|
|
template <typename Generator, typename OutputIterator, typename Context |
|
, typename Delimiter, typename Attribute> |
|
bool lazy_generate_impl(Generator const& g, OutputIterator& sink |
|
, Context& context, Delimiter const& delim |
|
, Attribute const& attr, mpl::true_) |
|
{ |
|
// If DeducedAuto is false (semantic actions is present), the |
|
// component's attribute is unused. |
|
return g.generate(sink, context, delim, unused); |
|
} |
|
|
|
template <typename Generator, typename OutputIterator, typename Context |
|
, typename Delimiter, typename Attribute> |
|
bool lazy_generate_impl_main(Generator const& g, OutputIterator& sink |
|
, Context& context, Delimiter const& delim, Attribute const& attr) |
|
{ |
|
// If DeducedAuto is true (no semantic action), we pass the parser's |
|
// attribute on to the component. |
|
typedef typename traits::has_semantic_action<Generator>::type auto_rule; |
|
return lazy_generate_impl(g, sink, context, delim, attr, auto_rule()); |
|
} |
|
} |
|
|
|
template <typename Function, typename Modifiers> |
|
struct lazy_generator : generator<lazy_generator<Function, Modifiers> > |
|
{ |
|
typedef mpl::int_<generator_properties::all_properties> properties; |
|
|
|
template <typename Context, typename Iterator> |
|
struct attribute |
|
{ |
|
typedef typename |
|
boost::result_of<karma_modify(tag::lazy_eval, Modifiers)>::type |
|
modifier; |
|
|
|
typedef typename |
|
remove_reference< |
|
typename boost::result_of<Function(unused_type, Context)>::type |
|
>::type |
|
expr_type; |
|
|
|
// If you got an error_invalid_expression error message here, |
|
// then the expression (expr_type) is not a valid spirit karma |
|
// expression. |
|
BOOST_SPIRIT_ASSERT_MATCH(karma::domain, expr_type); |
|
|
|
typedef typename |
|
result_of::compile<karma::domain, expr_type, modifier>::type |
|
generator_type; |
|
|
|
typedef typename |
|
traits::attribute_of<generator_type, Context, Iterator>::type |
|
type; |
|
}; |
|
|
|
lazy_generator(Function const& func, Modifiers const& modifiers) |
|
: func(func), modifiers(modifiers) {} |
|
|
|
template < |
|
typename OutputIterator, typename Context, |
|
typename Delimiter, typename Attribute |
|
> |
|
bool generate(OutputIterator& sink, Context& context, |
|
Delimiter const& d, Attribute const& attr) const |
|
{ |
|
return detail::lazy_generate_impl_main( |
|
compile<karma::domain>(func(unused, context) |
|
, karma_modify()(tag::lazy_eval(), modifiers)) |
|
, sink, context, d, attr); |
|
} |
|
|
|
template <typename Context> |
|
info what(Context& context) const |
|
{ |
|
return info("lazy" |
|
, compile<karma::domain>(func(unused, context) |
|
, karma_modify()(tag::lazy_eval(), modifiers)) |
|
.what(context) |
|
); |
|
} |
|
|
|
Function func; |
|
Modifiers modifiers; |
|
|
|
private: |
|
// silence MSVC warning C4512: assignment operator could not be generated |
|
lazy_generator& operator= (lazy_generator const&); |
|
}; |
|
|
|
/////////////////////////////////////////////////////////////////////////// |
|
template <typename Function, typename Subject, typename Modifiers> |
|
struct lazy_directive |
|
: unary_generator<lazy_directive<Function, Subject, Modifiers> > |
|
{ |
|
typedef mpl::int_<generator_properties::all_properties> properties; |
|
|
|
typedef Subject subject_type; |
|
|
|
template <typename Context, typename Iterator> |
|
struct attribute |
|
{ |
|
typedef typename |
|
boost::result_of<karma_modify(tag::lazy_eval, Modifiers)>::type |
|
modifier; |
|
|
|
typedef typename |
|
remove_reference< |
|
typename boost::result_of<Function(unused_type, Context)>::type |
|
>::type |
|
directive_expr_type; |
|
|
|
typedef typename |
|
proto::result_of::make_expr< |
|
proto::tag::subscript |
|
, directive_expr_type |
|
, Subject |
|
>::type |
|
expr_type; |
|
|
|
// If you got an error_invalid_expression error message here, |
|
// then the expression (expr_type) is not a valid spirit karma |
|
// expression. |
|
BOOST_SPIRIT_ASSERT_MATCH(karma::domain, expr_type); |
|
|
|
typedef typename |
|
result_of::compile<karma::domain, expr_type, modifier>::type |
|
generator_type; |
|
|
|
typedef typename |
|
traits::attribute_of<generator_type, Context, Iterator>::type |
|
type; |
|
}; |
|
|
|
lazy_directive(Function const& function, Subject const& subject |
|
, Modifiers const& modifiers) |
|
: function(function), subject(subject), modifiers(modifiers) {} |
|
|
|
template <typename OutputIterator, typename Context, typename Delimiter |
|
, typename Attribute> |
|
bool generate(OutputIterator& sink, Context& ctx, Delimiter const& d |
|
, Attribute const& attr) const |
|
{ |
|
return detail::lazy_generate_impl_main(compile<karma::domain>( |
|
proto::make_expr<proto::tag::subscript>( |
|
function(unused, ctx), subject) |
|
, karma_modify()(tag::lazy_eval(), modifiers)) |
|
, sink, ctx, d, attr); |
|
} |
|
|
|
template <typename Context> |
|
info what(Context& ctx) const |
|
{ |
|
return info("lazy-directive" |
|
, compile<karma::domain>( |
|
proto::make_expr<proto::tag::subscript>( |
|
function(unused, ctx), subject) |
|
, karma_modify()(tag::lazy_eval(), modifiers)) |
|
.what(ctx) |
|
); |
|
} |
|
|
|
Function function; |
|
Subject subject; |
|
Modifiers modifiers; |
|
}; |
|
|
|
/////////////////////////////////////////////////////////////////////////// |
|
// Generator generators: make_xxx function (objects) |
|
/////////////////////////////////////////////////////////////////////////// |
|
template <typename Eval, typename Modifiers> |
|
struct make_primitive<phoenix::actor<Eval>, Modifiers> |
|
{ |
|
typedef lazy_generator<phoenix::actor<Eval>, Modifiers> result_type; |
|
result_type operator()(phoenix::actor<Eval> const& f |
|
, Modifiers const& modifiers) const |
|
{ |
|
return result_type(f, modifiers); |
|
} |
|
}; |
|
|
|
template <typename Terminal, typename Actor, int Arity, typename Modifiers> |
|
struct make_primitive<lazy_terminal<Terminal, Actor, Arity>, Modifiers> |
|
{ |
|
typedef lazy_generator<Actor, Modifiers> result_type; |
|
result_type operator()( |
|
lazy_terminal<Terminal, Actor, Arity> const& lt |
|
, Modifiers const& modifiers) const |
|
{ |
|
return result_type(lt.actor, modifiers); |
|
} |
|
}; |
|
|
|
template < |
|
typename Terminal, typename Actor, int Arity, typename Subject |
|
, typename Modifiers> |
|
struct make_directive<lazy_terminal<Terminal, Actor, Arity> |
|
, Subject, Modifiers> |
|
{ |
|
typedef lazy_directive<Actor, Subject, Modifiers> result_type; |
|
result_type operator()( |
|
lazy_terminal<Terminal, Actor, Arity> const& lt |
|
, Subject const& subject, Modifiers const& modifiers) const |
|
{ |
|
return result_type(lt.actor, subject, modifiers); |
|
} |
|
}; |
|
|
|
}}} |
|
|
|
#endif
|
|
|