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// Copyright (c) 2001-2011 Hartmut Kaiser
//
// 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_LEX_STRING_TOKEN_DEF_MAR_28_2007_0722PM)
#define BOOST_SPIRIT_LEX_STRING_TOKEN_DEF_MAR_28_2007_0722PM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/spirit/home/support/common_terminals.hpp>
#include <boost/spirit/home/support/string_traits.hpp>
#include <boost/spirit/home/lex/domain.hpp>
#include <boost/spirit/home/lex/lexer_type.hpp>
#include <boost/spirit/home/lex/meta_compiler.hpp>
#include <boost/type_traits/add_const.hpp>
#include <boost/type_traits/add_reference.hpp>
#include <boost/type_traits/remove_const.hpp>
#include <boost/fusion/include/vector.hpp>
#include <boost/fusion/include/at.hpp>
namespace boost { namespace spirit
{
///////////////////////////////////////////////////////////////////////////
// Enablers
///////////////////////////////////////////////////////////////////////////
template <typename T>
struct use_terminal<lex::domain, T
, typename enable_if<traits::is_string<T> >::type> // enables strings
: mpl::true_ {};
template <typename CharEncoding, typename A0>
struct use_terminal<lex::domain
, terminal_ex<
tag::char_code<tag::string, CharEncoding> // enables string(str)
, fusion::vector1<A0> >
> : traits::is_string<A0> {};
}}
namespace boost { namespace spirit { namespace lex
{
// use string from standard character set by default
using spirit::standard::string_type;
using spirit::standard::string;
///////////////////////////////////////////////////////////////////////////
//
// string_token_def
// represents a string based token definition
//
///////////////////////////////////////////////////////////////////////////
template <typename String, typename CharEncoding = char_encoding::standard>
struct string_token_def
: primitive_lexer<string_token_def<String, CharEncoding> >
{
typedef typename
remove_const<typename traits::char_type_of<String>::type>::type
char_type;
typedef std::basic_string<char_type> string_type;
string_token_def(typename add_reference<String>::type str)
: str_(str), id_(std::size_t(~0)), unique_id_(std::size_t(~0))
, token_state_(std::size_t(~0))
{}
template <typename LexerDef, typename String_>
void collect(LexerDef& lexdef, String_ const& state
, String_ const& targetstate) const
{
std::size_t state_id = lexdef.add_state(state.c_str());
// If the following assertion fires you are probably trying to use
// a single string_token_def instance in more than one lexer state.
// This is not possible. Please create a separate token_def instance
// from the same regular expression for each lexer state it needs
// to be associated with.
BOOST_ASSERT(
(std::size_t(~0) == token_state_ || state_id == token_state_) &&
"Can't use single string_token_def with more than one lexer state");
char_type const* target = targetstate.empty() ? 0 : targetstate.c_str();
if (target)
lexdef.add_state(target);
token_state_ = state_id;
typedef typename LexerDef::id_type id_type;
if (std::size_t(~0) == id_)
id_ = lexdef.get_next_id();
unique_id_ = lexdef.add_token (state.c_str(), str_, id_, target);
}
template <typename LexerDef>
void add_actions(LexerDef&) const {}
std::size_t id() const { return id_; }
std::size_t unique_id() const { return unique_id_; }
std::size_t state() const { return token_state_; }
string_type str_;
mutable std::size_t id_;
mutable std::size_t unique_id_;
mutable std::size_t token_state_;
};
///////////////////////////////////////////////////////////////////////////
// Lex generators: make_xxx function (objects)
///////////////////////////////////////////////////////////////////////////
template <typename T, typename Modifiers>
struct make_primitive<T, Modifiers
, typename enable_if<traits::is_string<T> >::type>
{
typedef typename add_const<T>::type const_string;
typedef string_token_def<const_string> result_type;
result_type operator()(
typename add_reference<const_string>::type str, unused_type) const
{
return result_type(str);
}
};
template <typename Modifiers, typename CharEncoding, typename A0>
struct make_primitive<
terminal_ex<
tag::char_code<tag::string, CharEncoding>
, fusion::vector1<A0> >
, Modifiers>
{
typedef typename add_const<A0>::type const_string;
typedef string_token_def<const_string, CharEncoding> result_type;
template <typename Terminal>
result_type operator()(Terminal const& term, unused_type) const
{
return result_type(fusion::at_c<0>(term.args));
}
};
}}} // namespace boost::spirit::lex
#endif
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Swift