diff --git a/sprout/config/suffix.hpp b/sprout/config/suffix.hpp
index 7bd30b93..e518aa3d 100644
--- a/sprout/config/suffix.hpp
+++ b/sprout/config/suffix.hpp
@@ -236,4 +236,9 @@
 #	define NS_SSCRISK_CEL_OR_SPROUT sscrisk::cel
 #endif	// #ifndef SPROUT_CONFIG_USE_SSCRISK_CEL
 
+//
+// SPROUT_PREVENT_MACRO_SUBSTITUTION
+//
+#define SPROUT_PREVENT_MACRO_SUBSTITUTION
+
 #endif	// #ifndef SPROUT_CONFIG_SUFFIX_HPP
diff --git a/sprout/net/endian.hpp b/sprout/net/endian.hpp
index 94b870cc..09d18277 100644
--- a/sprout/net/endian.hpp
+++ b/sprout/net/endian.hpp
@@ -122,7 +122,7 @@ namespace sprout {
         // template<>
         // constexpr unsigned-integral hton(unsigned-integral host)
         template<typename T>
-        SPROUT_CONSTEXPR T hton(T host) {
+        SPROUT_CONSTEXPR T hton SPROUT_PREVENT_MACRO_SUBSTITUTION (T host) {
 #if defined(BOOST_BIG_ENDIAN)
             return host;
 #elif defined(BOOST_LITTLE_ENDIAN)
@@ -136,7 +136,7 @@ namespace sprout {
         // template<>
         // constexpr unsigned-integral ntoh(unsigned-integral net)
         template<typename T>
-        SPROUT_CONSTEXPR T ntoh(T net) {
+        SPROUT_CONSTEXPR T ntoh SPROUT_PREVENT_MACRO_SUBSTITUTION (T net) {
 #if defined(BOOST_BIG_ENDIAN)
             return net;
 #elif defined(BOOST_LITTLE_ENDIAN)
@@ -148,26 +148,26 @@ namespace sprout {
 
         // http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3620.pdf
         // uint32_t htonl(uint32_t host32)
-        SPROUT_CONSTEXPR std::uint32_t htonl(std::uint32_t host32) {
-            return sprout::net::hton(host32);
+        SPROUT_CONSTEXPR std::uint32_t htonl SPROUT_PREVENT_MACRO_SUBSTITUTION (std::uint32_t host32) {
+            return sprout::net::hton SPROUT_PREVENT_MACRO_SUBSTITUTION (host32);
         }
 
         // http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3620.pdf
         // uint16_t htons(uint16_t host16)
-        SPROUT_CONSTEXPR std::uint16_t htons(std::uint16_t host16) {
-            return sprout::net::hton(host16);
+        SPROUT_CONSTEXPR std::uint16_t htons SPROUT_PREVENT_MACRO_SUBSTITUTION (std::uint16_t host16) {
+            return sprout::net::hton SPROUT_PREVENT_MACRO_SUBSTITUTION (host16);
         }
 
         // http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3620.pdf
         // uint32_t ntohl(uint32_t net32)
-        SPROUT_CONSTEXPR std::uint32_t ntohl(std::uint32_t net32) {
-            return sprout::net::ntoh(net32);
+        SPROUT_CONSTEXPR std::uint32_t ntohl SPROUT_PREVENT_MACRO_SUBSTITUTION (std::uint32_t net32) {
+            return sprout::net::ntoh SPROUT_PREVENT_MACRO_SUBSTITUTION (net32);
         }
 
         // http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3620.pdf
         // uint16_t ntohs(uint32_t net16)
-        SPROUT_CONSTEXPR std::uint16_t ntohs(std::uint16_t net16) {
-            return sprout::net::ntoh(net16);
+        SPROUT_CONSTEXPR std::uint16_t ntohs SPROUT_PREVENT_MACRO_SUBSTITUTION (std::uint16_t net16) {
+            return sprout::net::ntoh SPROUT_PREVENT_MACRO_SUBSTITUTION (net16);
         }
     }   //namespace net
 }	// namespace sprout
diff --git a/tools/files/CMakeLists.txt b/tools/files/CMakeLists.txt
new file mode 100644
index 00000000..bf6494e8
--- /dev/null
+++ b/tools/files/CMakeLists.txt
@@ -0,0 +1,6 @@
+add_executable( tools_files_filegraph filegraph.cpp )
+set_target_properties( tools_files_filegraph PROPERTIES OUTPUT_NAME "filegraph" )
+install( TARGETS tools_files_filegraph
+  RUNTIME DESTINATION bin
+  LIBRARY DESTINATION lib
+)
diff --git a/tools/files/filegraph.cpp b/tools/files/filegraph.cpp
new file mode 100644
index 00000000..1e87e7e8
--- /dev/null
+++ b/tools/files/filegraph.cpp
@@ -0,0 +1,417 @@
+/*=============================================================================
+  Copyright (c) 2011-2014 Bolero MURAKAMI
+  https://github.com/bolero-MURAKAMI/Sprout
+
+  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)
+=============================================================================*/
+
+#include <cstdlib>
+#include <iostream>
+#include <sstream>
+#include <fstream>
+#include <string>
+#include <vector>
+#include <utility>
+#include <iterator>
+#include <algorithm>
+#include <boost/wave.hpp>
+#include <boost/wave/preprocessing_hooks.hpp>
+#include <boost/wave/cpplexer/cpp_lex_token.hpp>
+#include <boost/wave/cpplexer/cpp_lex_iterator.hpp>
+#include <boost/graph/adjacency_list.hpp>
+#include <boost/graph/depth_first_search.hpp>
+#include <boost/graph/graphviz.hpp>
+#include <boost/filesystem.hpp>
+#include <boost/range.hpp>
+#include <boost/algorithm/string.hpp>
+#include "../sprig/algorithm/string.hpp"
+#include "../sprig/graph/depth_first_search.hpp"
+
+class include_graph_hooks
+	: public boost::wave::context_policies::default_preprocessing_hooks
+{
+private:
+	typedef boost::wave::context_policies::default_preprocessing_hooks base_type;
+public:
+	// グラフのノード
+	struct node_type {
+		boost::filesystem::path absolute;
+		boost::filesystem::path filename;
+		bool has_include_guard;
+	public:
+		node_type(boost::filesystem::path const& absolute, boost::filesystem::path const& filename)
+			: absolute(absolute), filename(filename), has_include_guard(false)
+		{}
+		operator boost::filesystem::path const&() const {
+			return filename;
+		}
+		operator std::string() const {
+			return filename.generic_string();
+		}
+		friend bool operator==(node_type const& lhs, node_type const& rhs) {
+			return lhs.absolute == rhs.absolute;
+		}
+		friend bool operator==(node_type const& lhs, boost::filesystem::path const& rhs) {
+			return lhs.absolute == rhs;
+		}
+		friend bool operator==(boost::filesystem::path const& lhs, node_type const& rhs) {
+			return lhs == rhs.absolute;
+		}
+		friend bool operator!=(node_type const& lhs, node_type const& rhs) {
+			return !(lhs == rhs);
+		}
+		friend bool operator!=(node_type const& lhs, boost::filesystem::path const& rhs) {
+			return !(lhs == rhs);
+		}
+		friend bool operator!=(boost::filesystem::path const& lhs, node_type const& rhs) {
+			return !(lhs == rhs);
+		}
+		template<typename Elem, typename Traits>
+		friend std::basic_ostream<Elem, Traits>& operator<<(std::basic_ostream<Elem, Traits>& lhs, node_type const& rhs) {
+			return lhs << rhs.filename.generic_string();
+		}
+	};
+	typedef std::pair<int, int> edge_type;
+	typedef boost::adjacency_list<
+		boost::vecS,
+		boost::vecS,
+		boost::bidirectionalS,
+		boost::no_property
+	> graph_type;
+private:
+	std::vector<node_type> node_list_;
+	std::vector<edge_type> edge_list_;
+	std::vector<int> current_list_;
+	int current_;
+public:
+	explicit include_graph_hooks(boost::filesystem::path const& start)
+		: node_list_{node_type{boost::filesystem::absolute(start), start.filename()}}
+		, edge_list_{}
+		, current_list_{0}
+		, current_(0)
+	{}
+	std::vector<node_type> const&
+	nodes() const {
+		return node_list_;
+	}
+	std::vector<edge_type> const&
+	edges() const {
+		return edge_list_;
+	}
+	// グラフ生成
+	template<typename Graph>
+	Graph make_graph() const {
+		return Graph(edge_list_.begin(), edge_list_.end(), node_list_.size());
+	}
+	graph_type make_graph() const {
+		return make_graph<graph_type>();
+	}
+	// graphviz 出力
+	void write_graphviz(std::ostream& out) const {
+		boost::write_graphviz(
+			out,
+			make_graph<graph_type>(),
+			boost::make_label_writer(&node_list_[0])
+		);
+	}
+	// 非インクルードガード検出
+	template<typename OutputIterator>
+	void collect_no_include_guard_files(OutputIterator result) const {
+		std::copy_if(
+			node_list_.begin() + 1, node_list_.end(), result,
+			[](node_type const& e) { return !e.has_include_guard; }
+			);
+	}
+	// 循環インクルード検出
+	template<typename OutputIterator>
+	void collect_circulated_includes(OutputIterator result) const {
+		boost::depth_first_search(
+			make_graph<graph_type>(),
+			boost::visitor(sprig::make_back_edge_recorder(result))
+			);
+	}
+	// 孤立ファイル検出
+	template<typename OutputIterator>
+	void collect_isolated_files(OutputIterator result, boost::filesystem::path const& path) const {
+		typedef boost::filesystem::recursive_directory_iterator iterator;
+		for (auto it = iterator(path), last = iterator(); it != last; ++it) {
+			if (!boost::filesystem::is_directory(*it)) {
+				boost::filesystem::path abspath(boost::filesystem::absolute(*it));
+				auto found = std::find(node_list_.begin(), node_list_.end(), abspath);
+				if (found == node_list_.end()) {	// インクルードされていないならば結果に追加
+					*result++ = abspath.generic_string();
+				}
+			}
+		}
+	}
+public:
+	// インクルードファイルパス設定処理をフック
+	template<typename Context>
+	bool locate_include_file(
+		Context& ctx,
+		std::string& file_path,
+		bool is_system,
+		char const* current_name,
+		std::string& dir_path,
+		std::string& native_name
+		)
+	{
+		std::string filename = is_system ? ('<' + file_path + '>') : ('\"' + file_path + '\"');
+		if (!base_type::locate_include_file(ctx, file_path, is_system, current_name, dir_path, native_name)) {
+			return false;
+		}
+		dir_path = filename;	// インクルードディレクティブのテキストで上書き
+		return true;
+	}
+	// インクルードファイル解析開始をフック
+	template<typename Context>
+	void opened_include_file(
+		Context const& /*ctx*/,
+		std::string const& relname,
+		std::string const& absname,
+		bool /*is_system_include*/
+		)
+	{
+		boost::filesystem::path abspath(boost::filesystem::absolute(absname));
+		auto found = std::find(node_list_.begin(), node_list_.end(), abspath);
+		auto to = std::distance(node_list_.begin(), found);
+		if (found == node_list_.end()) {	// 最初のインクルードならばノードに追加
+			node_list_.emplace_back(abspath, relname);
+		}
+		edge_list_.emplace_back(current_list_.back(), to);
+		current_list_.push_back(to);	// カレントを更新
+		current_ = to;
+	}
+	// インクルードファイル解析完了をフック
+	template<typename Context>
+	void returning_from_include_file(Context const& /*ctx*/) {
+		current_ = current_list_.back();
+		current_list_.pop_back();	// カレントを戻す
+	}
+	// インクルードガード検出をフック
+	template<typename Context>
+	void detected_include_guard(
+		Context const& /*ctx*/,
+		std::string const& /*filename*/,
+		std::string const& /*include_guard*/
+		)
+	{
+		node_list_.at(current_).has_include_guard = true;
+	}
+	template<typename Context, typename Token>
+	void detected_pragma_once(
+		Context const& /*ctx*/,
+		Token const& /*pragma_token*/,
+		std::string const& /*filename*/
+		)
+	{
+		node_list_.at(current_).has_include_guard = true;
+	}
+};
+
+// システムインクルードパスの取得
+template<typename OutputIterator>
+void collect_sysinclude_paths(OutputIterator result, std::string const& command = "g++") {
+	{
+		std::ofstream ofs("_collect_sysinclude_paths.cpp");
+	}
+	std::system((command + " -v -E _collect_sysinclude_paths.cpp 1> /dev/null 2> _collect_sysinclude_paths").c_str());
+	{
+		std::ifstream ifs("_collect_sysinclude_paths");
+		std::string text(
+			std::istreambuf_iterator<char>(ifs.rdbuf()),
+			std::istreambuf_iterator<char>()
+			);
+		auto rng = boost::make_iterator_range(text);
+		rng = sprig::find_skip(rng, boost::algorithm::first_finder("#include <...>"));	// インクルードパスの始点までスキップ
+		rng = sprig::find_skip(rng, boost::algorithm::first_finder("\n"));
+		while (boost::algorithm::starts_with(rng, " ")) {
+			auto found = sprig::find_between(
+				rng,
+				boost::algorithm::token_finder(boost::algorithm::is_space(), boost::algorithm::token_compress_on),
+				boost::algorithm::first_finder("\n")
+				);
+			*result++ = std::string(boost::begin(found), boost::end(found));
+			rng = boost::make_iterator_range(boost::end(found), boost::end(rng));
+			rng = sprig::find_skip(rng, boost::algorithm::first_finder("\n"));
+		}
+	}
+}
+
+int main(int argc, const char* argv[]) {
+	std::string src;
+	std::string text;
+
+	if (argc >= 2) {
+		src = argv[1];
+
+		// ファイルの内容を全部 text に読み込む
+		std::ifstream ifs(argv[1]);
+		text = std::string(
+			std::istreambuf_iterator<char>(ifs.rdbuf()),
+			std::istreambuf_iterator<char>()
+			);
+	}
+
+	try {
+		// プリプロセッサを用意
+		typedef boost::wave::context<
+			std::string::iterator,
+			boost::wave::cpplexer::lex_iterator<boost::wave::cpplexer::lex_token<> >,
+			boost::wave::iteration_context_policies::load_file_to_string,
+			::include_graph_hooks
+		> context_type;
+		context_type ctx(text.begin(), text.end(), src.c_str(), ::include_graph_hooks(src));
+
+		// ランゲージの設定
+		ctx.set_language(
+			boost::wave::language_support(
+				boost::wave::support_cpp11
+				| boost::wave::support_option_include_guard_detection	// インクルードガード検出
+				)
+			);
+		// インクルードパスの設定
+		{
+			std::vector<std::string> list;
+			::collect_sysinclude_paths(std::back_inserter(list));
+			std::cout
+				<< "sysinclude paths :\n"
+				;
+			for (auto&& e : list) {
+				std::cout
+					<< " " << e << "\n"
+					;
+				ctx.add_sysinclude_path(e.c_str());
+			}
+			std::cout
+				<< std::flush
+				;
+		}
+
+		if (!src.empty()) {
+			// プリプロセスを走らせる
+			for (auto&& e : ctx) {
+				//std::cout << e.get_value();
+			}
+		}
+
+		for ( ; ;) {
+			std::cout
+				<< "> "
+				<< std::flush
+				;
+			std::string line;
+			std::getline(std::cin, line);
+			if (line.empty()) {
+				break;
+			}
+			std::vector<std::string> tokens;
+			boost::algorithm::split(tokens, line, boost::algorithm::is_space());
+			if (tokens.at(0) == "find") {
+				// インクルードファイルを検索
+				if (tokens.size() < 2) {
+					std::cout
+						<< "missing parameter.\n"
+						<< std::flush
+						;
+					continue;
+				}
+				std::cout
+					<< "find <" << tokens.at(1) << "> :\n"
+					;
+				std::string filepath(tokens.at(1));
+				std::string dirpath;
+				if (!ctx.find_include_file(filepath, dirpath, true, 0)) {
+					std::cout
+						<< " not found\n"
+						<< std::flush
+						;
+					continue;
+				}
+				std::cout
+					<< " " << filepath << "\n"
+					<< std::flush
+					;
+			} else if (tokens.at(0) == "graph") {
+				// グラフ出力
+				std::cout
+					<< "graph output > out.graph.dot\n"
+					;
+				std::ofstream ofs("out.graph.dot");
+				ctx.get_hooks().write_graphviz(ofs);
+				std::cout
+					<< std::flush
+					;
+			} else if (tokens.at(0) == "noguard") {
+				// 非インクルードガードを出力
+				std::vector<::include_graph_hooks::node_type> list;
+				ctx.get_hooks().collect_no_include_guard_files(std::back_inserter(list));
+				std::cout
+					<< "no include guarde files (" << list.size() << ") :\n"
+					;
+				for (auto const& e : list) {
+					std::cout
+						<< " " << e << "\n"
+						;
+				}
+				std::cout
+					<< std::flush
+					;
+			} else if (tokens.at(0) == "circulated") {
+				// 循環インクルードを出力
+				std::vector<typename boost::graph_traits<::include_graph_hooks::graph_type>::edge_descriptor> list;
+				ctx.get_hooks().collect_circulated_includes(std::back_inserter(list));
+				auto g = ctx.get_hooks().make_graph();
+				std::cout
+					<< "circulated includes (" << list.size() << ") :\n"
+					;
+				for (auto const& e : list) {
+					std::cout
+						<< " " << boost::source(e, g) << "[" << ctx.get_hooks().nodes()[boost::source(e, g)] << "]\n"
+						<< "  -> " << boost::target(e, g) << "[" << ctx.get_hooks().nodes()[boost::target(e, g)] << "]\n"
+						;
+				}
+				std::cout
+					<< std::flush
+					;
+			} else if (tokens.at(0) == "isolated") {
+				// Sprout の孤立ファイルを出力
+				std::cout
+					<< "isolated files output > out.isolated.txt\n"
+					;
+				std::ofstream ofs("out.isolated.txt");
+				// Sprout のシステムインクル−ドパスを取得
+				std::string filepath("sprout/config.hpp");
+				std::string dirpath;
+				if (!ctx.find_include_file(filepath, dirpath, true, 0)) {
+					std::cerr
+						<< "#error sprout not found\n"
+						<< std::flush
+						;
+					continue;
+				}
+				dirpath = boost::filesystem::path(filepath).parent_path().generic_string();
+				// リスト出力
+				std::vector<std::string> list;
+				ctx.get_hooks().collect_isolated_files(std::back_inserter(list), dirpath);
+				std::sort(list.begin(), list.end());
+				std::copy(list.begin(), list.end(), std::ostream_iterator<std::string>(ofs, "\n"));
+				std::cout
+					<< std::flush
+					;
+			} else {
+				std::cout
+					<< "invalid command\n"
+					<< std::flush
+					;
+			}
+		}
+	} catch (boost::wave::cpp_exception& e) {
+		// プリプロセスでエラー発生
+		std::cerr
+			<< "#error " << e.file_name() << "(" << e.line_no() << "):" << e.description() << "\n"
+			<< std::flush
+			;
+	}
+}
diff --git a/tools/sprig/algorithm/string.hpp b/tools/sprig/algorithm/string.hpp
new file mode 100644
index 00000000..37a46f93
--- /dev/null
+++ b/tools/sprig/algorithm/string.hpp
@@ -0,0 +1,13 @@
+/*=============================================================================
+  Copyright (c) 2011-2014 Bolero MURAKAMI
+  https://github.com/bolero-MURAKAMI/Sprout
+
+  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)
+=============================================================================*/
+#ifndef TOOLS_SPRIG_ALGORITHM_STRING_HPP
+#define TOOLS_SPRIG_ALGORITHM_STRING_HPP
+
+#include "./string/find.hpp"
+
+#endif	// #ifndef TOOLS_SPRIG_ALGORITHM_STRING_HPP
diff --git a/tools/sprig/algorithm/string/find.hpp b/tools/sprig/algorithm/string/find.hpp
new file mode 100644
index 00000000..d4539579
--- /dev/null
+++ b/tools/sprig/algorithm/string/find.hpp
@@ -0,0 +1,14 @@
+/*=============================================================================
+  Copyright (c) 2011-2014 Bolero MURAKAMI
+  https://github.com/bolero-MURAKAMI/Sprout
+
+  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)
+=============================================================================*/
+#ifndef TOOLS_SPRIG_ALGORITHM_STRING_FIND_HPP
+#define TOOLS_SPRIG_ALGORITHM_STRING_FIND_HPP
+
+#include "./find_skip.hpp"
+#include "./find_between.hpp"
+
+#endif	// #ifndef TOOLS_SPRIG_ALGORITHM_STRING_FIND_HPP
diff --git a/tools/sprig/algorithm/string/find_between.hpp b/tools/sprig/algorithm/string/find_between.hpp
new file mode 100644
index 00000000..b182324c
--- /dev/null
+++ b/tools/sprig/algorithm/string/find_between.hpp
@@ -0,0 +1,51 @@
+/*=============================================================================
+  Copyright (c) 2011-2014 Bolero MURAKAMI
+  https://github.com/bolero-MURAKAMI/Sprout
+
+  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)
+=============================================================================*/
+#ifndef TOOLS_SPRIG_ALGORITHM_STRING_FIND_BETWEEN_HPP
+#define TOOLS_SPRIG_ALGORITHM_STRING_FIND_BETWEEN_HPP
+
+#include <boost/range/functions.hpp>
+#include <boost/range/metafunctions.hpp>
+#include <boost/range/iterator_range.hpp>
+#include <boost/algorithm/string/find.hpp>
+
+namespace sprig {
+	//
+	// between_finder
+	//
+	template<typename Finder1, typename Finder2>
+	struct between_finderF {
+	private:
+		Finder1 finder1_;
+		Finder2 finder2_;
+	public:
+		between_finderF(Finder1 const& finder1, Finder2 const& finder2)
+			: finder1_(finder1), finder2_(finder2)
+		{}
+		template<typename ForwardIterator>
+		boost::iterator_range<ForwardIterator>
+		operator()(ForwardIterator first, ForwardIterator last) const {
+			first = boost::end(finder1_(first, last));
+			return boost::iterator_range<ForwardIterator>(first, boost::begin(finder2_(first, last)));
+		}
+	};
+	template<typename Finder1, typename Finder2>
+	inline sprig::between_finderF<Finder1, Finder2>
+	between_finder(Finder1 const& finder1, Finder2 const& finder2) {
+		return sprig::between_finderF<Finder1, Finder2>(finder1, finder2);
+	}
+	//
+	// find_between
+	//
+	template<typename Range, typename Finder1, typename Finder2>
+	inline boost::iterator_range<typename boost::range_iterator<Range>::type>
+	find_between(Range& input, Finder1 const& finder1, Finder2 const& finder2) {
+		return boost::algorithm::find(input, sprig::between_finder(finder1, finder2));
+	}
+}	// namespace sprig
+
+#endif	// #ifndef TOOLS_SPRIG_ALGORITHM_STRING_FIND_BETWEEN_HPP
diff --git a/tools/sprig/algorithm/string/find_skip.hpp b/tools/sprig/algorithm/string/find_skip.hpp
new file mode 100644
index 00000000..72564ff5
--- /dev/null
+++ b/tools/sprig/algorithm/string/find_skip.hpp
@@ -0,0 +1,80 @@
+/*=============================================================================
+  Copyright (c) 2011-2014 Bolero MURAKAMI
+  https://github.com/bolero-MURAKAMI/Sprout
+
+  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)
+=============================================================================*/
+#ifndef TOOLS_SPRIG_ALGORITHM_STRING_FIND_SKIP_HPP
+#define TOOLS_SPRIG_ALGORITHM_STRING_FIND_SKIP_HPP
+
+#include <boost/range/functions.hpp>
+#include <boost/range/metafunctions.hpp>
+#include <boost/range/iterator_range.hpp>
+#include <boost/algorithm/string/find.hpp>
+
+namespace sprig {
+	//
+	// skip_finder
+	//
+	template<typename Finder>
+	struct skip_finderF {
+	private:
+		Finder finder_;
+	public:
+		explicit skip_finderF(Finder const& finder)
+			: finder_(finder)
+		{}
+		template<typename ForwardIterator>
+		boost::iterator_range<ForwardIterator>
+		operator()(ForwardIterator first, ForwardIterator last) const {
+			return boost::iterator_range<ForwardIterator>(boost::end(finder_(first, last)), last);
+		}
+	};
+	template<typename Finder>
+	inline sprig::skip_finderF<Finder>
+	skip_finder(Finder const& finder) {
+		return sprig::skip_finderF<Finder>(finder);
+	}
+	//
+	// find_skip
+	//
+	template<typename Range, typename Finder>
+	inline boost::iterator_range<typename boost::range_iterator<Range>::type>
+	find_skip(Range& input, Finder const& finder) {
+		return boost::algorithm::find(input, sprig::skip_finder(finder));
+	}
+
+	//
+	// skip_backward_finder
+	//
+	template<typename Finder>
+	struct skip_backward_finderF {
+	private:
+		Finder finder_;
+	public:
+		explicit skip_backward_finderF(Finder const& finder)
+			: finder_(finder)
+		{}
+		template<typename ForwardIterator>
+		boost::iterator_range<ForwardIterator>
+		operator()(ForwardIterator first, ForwardIterator last) const {
+			return boost::iterator_range<ForwardIterator>(first, boost::begin(finder_(first, last)));
+		}
+	};
+	template<typename Finder>
+	inline sprig::skip_backward_finderF<Finder>
+	skip_backward_finder(Finder const& finder) {
+		return sprig::skip_backward_finderF<Finder>(finder);
+	}
+	//
+	// find_skip_backward
+	//
+	template<typename Range, typename Finder>
+	inline boost::iterator_range<typename boost::range_iterator<Range>::type>
+	find_skip_backward(Range& input, Finder const& finder) {
+		return boost::algorithm::find(input, sprig::skip_backward_finder(finder));
+	}
+}	// namespace sprig
+
+#endif	// #ifndef TOOLS_SPRIG_ALGORITHM_STRING_FIND_SKIP_HPP
diff --git a/tools/sprig/graph/back_edge_recorder.hpp b/tools/sprig/graph/back_edge_recorder.hpp
new file mode 100644
index 00000000..8336383c
--- /dev/null
+++ b/tools/sprig/graph/back_edge_recorder.hpp
@@ -0,0 +1,42 @@
+/*=============================================================================
+  Copyright (c) 2011-2014 Bolero MURAKAMI
+  https://github.com/bolero-MURAKAMI/Sprout
+
+  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)
+=============================================================================*/
+#ifndef TOOLS_SPRIG_GRAPH_BACK_EDGE_RECORDER_HPP
+#define TOOLS_SPRIG_GRAPH_BACK_EDGE_RECORDER_HPP
+
+#include <boost/graph/depth_first_search.hpp>
+
+namespace sprig {
+	//
+	// back_edge_recorder
+	//
+	template<typename OutputIterator>
+	struct back_edge_recorder
+		: public boost::default_dfs_visitor
+	{
+	private:
+		OutputIterator out_;
+	public:
+		explicit back_edge_recorder(OutputIterator out)
+			: out_(out)
+		{}
+		template<typename Edge, typename Graph>
+		void back_edge(Edge const& e, Graph const&) {
+			*out_++ = e;
+		}
+	};
+	//
+	// make_back_edge_recorder
+	//
+	template<typename OutputIterator >
+	inline sprig::back_edge_recorder<OutputIterator>
+	make_back_edge_recorder(OutputIterator out) {
+		return sprig::back_edge_recorder<OutputIterator>(out);
+	}
+}	// namespace sprig
+
+#endif	// #ifndef TOOLS_SPRIG_GRAPH_BACK_EDGE_RECORDER_HPP
diff --git a/tools/sprig/graph/depth_first_search.hpp b/tools/sprig/graph/depth_first_search.hpp
new file mode 100644
index 00000000..9120f7d4
--- /dev/null
+++ b/tools/sprig/graph/depth_first_search.hpp
@@ -0,0 +1,13 @@
+/*=============================================================================
+  Copyright (c) 2011-2014 Bolero MURAKAMI
+  https://github.com/bolero-MURAKAMI/Sprout
+
+  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)
+=============================================================================*/
+#ifndef TOOLS_SPRIG_GRAPH_DEPTH_FIRST_SEARCH_HPP
+#define TOOLS_SPRIG_GRAPH_DEPTH_FIRST_SEARCH_HPP
+
+#include "./back_edge_recorder.hpp"
+
+#endif	// #ifndef TOOLS_SPRIG_GRAPH_DEPTH_FIRST_SEARCH_HPP