186 lines
6.1 KiB
Plaintext
186 lines
6.1 KiB
Plaintext
/*=============================================================================
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Copyright (c) 1998-2003 Joel de Guzman
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http://spirit.sourceforge.net/
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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(BOOST_SPIRIT_MATCH_HPP)
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#define BOOST_SPIRIT_MATCH_HPP
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#include <boost/spirit/home/classic/namespace.hpp>
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#include <boost/spirit/home/classic/core/config.hpp>
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#include <boost/spirit/home/classic/core/nil.hpp>
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#include <boost/call_traits.hpp>
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#include <boost/optional.hpp>
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#include <boost/spirit/home/classic/core/assert.hpp>
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#include <boost/spirit/home/classic/core/safe_bool.hpp>
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#include <boost/spirit/home/classic/core/impl/match_attr_traits.ipp>
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#include <boost/type_traits/add_const.hpp>
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#include <boost/type_traits/is_reference.hpp>
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namespace boost { namespace spirit {
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BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
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///////////////////////////////////////////////////////////////////////////
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//
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// match class
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//
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// The match holds the result of a parser. A match object evaluates
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// to true when a successful match is found, otherwise false. The
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// length of the match is the number of characters (or tokens) that
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// is successfully matched. This can be queried through its length()
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// member function. A negative value means that the match is
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// unsucessful.
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//
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// Each parser may have an associated attribute. This attribute is
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// also returned back to the client on a successful parse through
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// the match object. The match's value() member function returns the
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// match's attribute.
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//
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// A match attribute is valid:
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//
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// * on a successful match
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// * when its value is set through the value(val) member function
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// * if it is assigned or copied from a compatible match object
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// (e.g. match<double> from match<int>) with a valid attribute.
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//
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// The match attribute is undefined:
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//
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// * on an unsuccessful match
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// * when an attempt to copy or assign from another match object
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// with an incompatible attribute type (e.g. match<std::string>
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// from match<int>).
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//
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// The member function has_valid_attribute() can be queried to know if
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// it is safe to get the match's attribute. The attribute may be set
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// through the member function value(v) where v is the new attribute
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// value.
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//
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///////////////////////////////////////////////////////////////////////////
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template <typename T = nil_t>
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class match : public safe_bool<match<T> >
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{
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public:
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typedef typename boost::optional<T> optional_type;
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typedef typename optional_type::argument_type ctor_param_t;
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typedef typename optional_type::reference_const_type return_t;
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typedef T attr_t;
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match();
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explicit match(std::size_t length);
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match(std::size_t length, ctor_param_t val);
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bool operator!() const;
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std::ptrdiff_t length() const;
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bool has_valid_attribute() const;
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return_t value() const;
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void swap(match& other);
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template <typename T2>
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match(match<T2> const& other)
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: len(other.length()), val()
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{
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impl::match_attr_traits<T>::copy(val, other);
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}
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template <typename T2>
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match&
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operator=(match<T2> const& other)
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{
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impl::match_attr_traits<T>::assign(val, other);
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len = other.length();
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return *this;
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}
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template <typename MatchT>
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void
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concat(MatchT const& other)
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{
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BOOST_SPIRIT_ASSERT(*this && other);
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len += other.length();
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}
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template <typename ValueT>
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void
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value(ValueT const& val_)
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{
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impl::match_attr_traits<T>::set_value(val, val_, is_reference<T>());
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}
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bool operator_bool() const
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{
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return len >= 0;
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}
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private:
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std::ptrdiff_t len;
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optional_type val;
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};
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///////////////////////////////////////////////////////////////////////////
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//
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// match class specialization for nil_t values
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//
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///////////////////////////////////////////////////////////////////////////
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template <>
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class match<nil_t> : public safe_bool<match<nil_t> >
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{
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public:
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typedef nil_t attr_t;
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typedef nil_t return_t;
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match();
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explicit match(std::size_t length);
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match(std::size_t length, nil_t);
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bool operator!() const;
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bool has_valid_attribute() const;
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std::ptrdiff_t length() const;
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nil_t value() const;
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void value(nil_t);
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void swap(match& other);
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template <typename T>
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match(match<T> const& other)
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: len(other.length()) {}
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template <typename T>
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match<>&
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operator=(match<T> const& other)
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{
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len = other.length();
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return *this;
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}
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template <typename T>
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void
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concat(match<T> const& other)
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{
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BOOST_SPIRIT_ASSERT(*this && other);
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len += other.length();
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}
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bool operator_bool() const
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{
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return len >= 0;
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}
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private:
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std::ptrdiff_t len;
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};
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BOOST_SPIRIT_CLASSIC_NAMESPACE_END
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}} // namespace BOOST_SPIRIT_CLASSIC_NS
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#endif
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#include <boost/spirit/home/classic/core/impl/match.ipp>
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