444 lines
11 KiB
C++
444 lines
11 KiB
C++
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/*=============================================================================
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Phoenix V1.2.1
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Copyright (c) 2001-2002 Joel de Guzman
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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_CLASSIC_PHOENIX_STATEMENTS_HPP
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#define BOOST_SPIRIT_CLASSIC_PHOENIX_STATEMENTS_HPP
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///////////////////////////////////////////////////////////////////////////////
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#include <boost/spirit/home/classic/phoenix/composite.hpp>
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///////////////////////////////////////////////////////////////////////////////
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namespace phoenix {
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///////////////////////////////////////////////////////////////////////////////
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//
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// sequential_composite
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//
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// Two or more actors separated by the comma generates a
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// sequential_composite which is a composite actor. Example:
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//
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// actor,
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// actor,
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// actor
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//
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// The actors are evaluated sequentially. The result type of this
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// is void. Note that the last actor should not have a trailing
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// comma.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename A0, typename A1>
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struct sequential_composite {
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typedef sequential_composite<A0, A1> self_t;
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template <typename TupleT>
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struct result { typedef void type; };
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sequential_composite(A0 const& _0, A1 const& _1)
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: a0(_0), a1(_1) {}
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template <typename TupleT>
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void
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eval(TupleT const& args) const
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{
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a0.eval(args);
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a1.eval(args);
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}
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A0 a0; A1 a1; // actors
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};
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//////////////////////////////////
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template <typename BaseT0, typename BaseT1>
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inline actor<sequential_composite<actor<BaseT0>, actor<BaseT1> > >
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operator,(actor<BaseT0> const& _0, actor<BaseT1> const& _1)
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{
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return sequential_composite<actor<BaseT0>, actor<BaseT1> >(_0, _1);
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// if_then_else_composite
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//
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// This composite has two (2) forms:
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//
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// if_(condition)
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// [
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// statement
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// ]
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//
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// and
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//
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// if_(condition)
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// [
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// true_statement
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// ]
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// .else_
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// [
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// false_statement
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// ]
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//
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// where condition is an actor that evaluates to bool. If condition
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// is true, the true_statement (again an actor) is executed
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// otherwise, the false_statement (another actor) is executed. The
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// result type of this is void. Note the trailing underscore after
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// if_ and the leading dot and the trailing underscore before
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// and after .else_.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename CondT, typename ThenT, typename ElseT>
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struct if_then_else_composite {
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typedef if_then_else_composite<CondT, ThenT, ElseT> self_t;
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template <typename TupleT>
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struct result {
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typedef void type;
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};
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if_then_else_composite(
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CondT const& cond_,
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ThenT const& then_,
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ElseT const& else__)
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: cond(cond_), then(then_), else_(else__) {}
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template <typename TupleT>
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void eval(TupleT const& args) const
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{
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if (cond.eval(args))
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then.eval(args);
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else
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else_.eval(args);
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}
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CondT cond; ThenT then; ElseT else_; // actors
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};
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//////////////////////////////////
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template <typename CondT, typename ThenT>
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struct else_gen {
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else_gen(CondT const& cond_, ThenT const& then_)
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: cond(cond_), then(then_) {}
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template <typename ElseT>
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actor<if_then_else_composite<CondT, ThenT,
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typename as_actor<ElseT>::type> >
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operator[](ElseT const& else_)
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{
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typedef if_then_else_composite<CondT, ThenT,
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typename as_actor<ElseT>::type>
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result;
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return result(cond, then, as_actor<ElseT>::convert(else_));
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}
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CondT cond; ThenT then;
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};
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//////////////////////////////////
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template <typename CondT, typename ThenT>
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struct if_then_composite {
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typedef if_then_composite<CondT, ThenT> self_t;
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template <typename TupleT>
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struct result { typedef void type; };
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if_then_composite(CondT const& cond_, ThenT const& then_)
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: cond(cond_), then(then_), else_(cond, then) {}
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template <typename TupleT>
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void eval(TupleT const& args) const
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{
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if (cond.eval(args))
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then.eval(args);
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}
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CondT cond; ThenT then; // actors
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else_gen<CondT, ThenT> else_;
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};
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//////////////////////////////////
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template <typename CondT>
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struct if_gen {
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if_gen(CondT const& cond_)
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: cond(cond_) {}
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template <typename ThenT>
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actor<if_then_composite<
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typename as_actor<CondT>::type,
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typename as_actor<ThenT>::type> >
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operator[](ThenT const& then) const
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{
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typedef if_then_composite<
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typename as_actor<CondT>::type,
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typename as_actor<ThenT>::type>
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result;
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return result(
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as_actor<CondT>::convert(cond),
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as_actor<ThenT>::convert(then));
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}
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CondT cond;
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};
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//////////////////////////////////
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template <typename CondT>
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inline if_gen<CondT>
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if_(CondT const& cond)
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{
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return if_gen<CondT>(cond);
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// while_composite
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//
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// This composite has the form:
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//
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// while_(condition)
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// [
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// statement
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// ]
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//
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// While the condition (an actor) evaluates to true, statement
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// (another actor) is executed. The result type of this is void.
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// Note the trailing underscore after while_.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename CondT, typename DoT>
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struct while_composite {
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typedef while_composite<CondT, DoT> self_t;
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template <typename TupleT>
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struct result { typedef void type; };
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while_composite(CondT const& cond_, DoT const& do__)
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: cond(cond_), do_(do__) {}
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template <typename TupleT>
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void eval(TupleT const& args) const
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{
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while (cond.eval(args))
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do_.eval(args);
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}
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CondT cond;
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DoT do_;
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};
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//////////////////////////////////
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template <typename CondT>
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struct while_gen {
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while_gen(CondT const& cond_)
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: cond(cond_) {}
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template <typename DoT>
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actor<while_composite<
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typename as_actor<CondT>::type,
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typename as_actor<DoT>::type> >
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operator[](DoT const& do_) const
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{
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typedef while_composite<
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typename as_actor<CondT>::type,
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typename as_actor<DoT>::type>
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result;
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return result(
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as_actor<CondT>::convert(cond),
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as_actor<DoT>::convert(do_));
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}
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CondT cond;
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};
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//////////////////////////////////
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template <typename CondT>
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inline while_gen<CondT>
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while_(CondT const& cond)
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{
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return while_gen<CondT>(cond);
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// do_composite
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//
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// This composite has the form:
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//
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// do_
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// [
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// statement
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// ]
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// .while_(condition)
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//
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// While the condition (an actor) evaluates to true, statement
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// (another actor) is executed. The statement is executed at least
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// once. The result type of this is void. Note the trailing
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// underscore after do_ and the leading dot and the trailing
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// underscore before and after .while_.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename DoT, typename CondT>
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struct do_composite {
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typedef do_composite<DoT, CondT> self_t;
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template <typename TupleT>
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struct result { typedef void type; };
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do_composite(DoT const& do__, CondT const& cond_)
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: do_(do__), cond(cond_) {}
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template <typename TupleT>
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void eval(TupleT const& args) const
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{
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do
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do_.eval(args);
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while (cond.eval(args));
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}
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DoT do_;
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CondT cond;
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};
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////////////////////////////////////
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template <typename DoT>
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struct do_gen2 {
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do_gen2(DoT const& do__)
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: do_(do__) {}
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template <typename CondT>
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actor<do_composite<
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typename as_actor<DoT>::type,
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typename as_actor<CondT>::type> >
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while_(CondT const& cond) const
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{
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typedef do_composite<
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typename as_actor<DoT>::type,
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typename as_actor<CondT>::type>
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result;
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return result(
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as_actor<DoT>::convert(do_),
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as_actor<CondT>::convert(cond));
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}
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DoT do_;
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};
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////////////////////////////////////
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struct do_gen {
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template <typename DoT>
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do_gen2<DoT>
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operator[](DoT const& do_) const
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{
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return do_gen2<DoT>(do_);
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}
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};
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do_gen const do_ = do_gen();
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///////////////////////////////////////////////////////////////////////////////
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//
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// for_composite
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//
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// This statement has the form:
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//
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// for_(init, condition, step)
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// [
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// statement
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// ]
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//
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// Where init, condition, step and statement are all actors. init
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// is executed once before entering the for-loop. The for-loop
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// exits once condition evaluates to false. At each loop iteration,
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// step and statement is called. The result of this statement is
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// void. Note the trailing underscore after for_.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename InitT, typename CondT, typename StepT, typename DoT>
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struct for_composite {
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typedef composite<InitT, CondT, StepT, DoT> self_t;
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template <typename TupleT>
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struct result { typedef void type; };
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for_composite(
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InitT const& init_,
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CondT const& cond_,
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StepT const& step_,
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DoT const& do__)
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: init(init_), cond(cond_), step(step_), do_(do__) {}
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template <typename TupleT>
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void
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eval(TupleT const& args) const
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{
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for (init.eval(args); cond.eval(args); step.eval(args))
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do_.eval(args);
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}
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InitT init; CondT cond; StepT step; DoT do_; // actors
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};
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//////////////////////////////////
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template <typename InitT, typename CondT, typename StepT>
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struct for_gen {
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for_gen(
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InitT const& init_,
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CondT const& cond_,
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StepT const& step_)
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: init(init_), cond(cond_), step(step_) {}
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template <typename DoT>
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actor<for_composite<
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typename as_actor<InitT>::type,
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typename as_actor<CondT>::type,
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typename as_actor<StepT>::type,
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typename as_actor<DoT>::type> >
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operator[](DoT const& do_) const
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{
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typedef for_composite<
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typename as_actor<InitT>::type,
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typename as_actor<CondT>::type,
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typename as_actor<StepT>::type,
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typename as_actor<DoT>::type>
|
||
|
|
result;
|
||
|
|
|
||
|
|
return result(
|
||
|
|
as_actor<InitT>::convert(init),
|
||
|
|
as_actor<CondT>::convert(cond),
|
||
|
|
as_actor<StepT>::convert(step),
|
||
|
|
as_actor<DoT>::convert(do_));
|
||
|
|
}
|
||
|
|
|
||
|
|
InitT init; CondT cond; StepT step;
|
||
|
|
};
|
||
|
|
|
||
|
|
//////////////////////////////////
|
||
|
|
template <typename InitT, typename CondT, typename StepT>
|
||
|
|
inline for_gen<InitT, CondT, StepT>
|
||
|
|
for_(InitT const& init, CondT const& cond, StepT const& step)
|
||
|
|
{
|
||
|
|
return for_gen<InitT, CondT, StepT>(init, cond, step);
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace phoenix
|
||
|
|
|
||
|
|
#endif
|