3 files changed, 50 insertions, 13 deletions

diff --git a/libsolidity/interface/CompilerStack.cpp b/libsolidity/interface/CompilerStack.cpp
index effc8309..9ad28573 100644
--- a/libsolidity/interface/CompilerStack.cpp
+++ b/libsolidity/interface/CompilerStack.cpp
@@ -55,7 +55,7 @@ using namespace std;
 using namespace dev;
 using namespace dev::solidity;
 
-CompilerStack::CompilerStack(ReadFileCallback const& _readFile):
+CompilerStack::CompilerStack(ReadFile::Callback const& _readFile):
 	m_readFile(_readFile), m_parseSuccessful(false) {}
 
 void CompilerStack::setRemappings(vector<string> const& _remappings)
@@ -522,7 +522,7 @@ StringMap CompilerStack::loadMissingSources(SourceUnit const& _ast, std::string
 			if (m_sources.count(importPath) || newSources.count(importPath))
 				continue;
 
-			ReadFileResult result{false, string("File not supplied initially.")};
+			ReadFile::Result result{false, string("File not supplied initially.")};
 			if (m_readFile)
 				result = m_readFile(importPath);
 
diff --git a/libsolidity/interface/CompilerStack.h b/libsolidity/interface/CompilerStack.h
index 65850683..9c37eead 100644
--- a/libsolidity/interface/CompilerStack.h
+++ b/libsolidity/interface/CompilerStack.h
@@ -36,6 +36,7 @@
 #include <libevmasm/SourceLocation.h>
 #include <libevmasm/LinkerObject.h>
 #include <libsolidity/interface/Exceptions.h>
+#include <libsolidity/interface/ReadFile.h>
 
 namespace dev
 {
@@ -77,18 +78,9 @@ enum class DocumentationType: uint8_t
 class CompilerStack: boost::noncopyable
 {
 public:
-	struct ReadFileResult
-	{
-		bool success;
-		std::string contentsOrErrorMessage;
-	};
-
-	/// File reading callback.
-	using ReadFileCallback = std::function<ReadFileResult(std::string const&)>;
-
 	/// Creates a new compiler stack.
 	/// @param _readFile callback to used to read files for import statements. Should return
-	explicit CompilerStack(ReadFileCallback const& _readFile = ReadFileCallback());
+	explicit CompilerStack(ReadFile::Callback const& _readFile = ReadFile::Callback());
 
 	/// Sets path remappings in the format "context:prefix=target"
 	void setRemappings(std::vector<std::string> const& _remappings);
@@ -263,7 +255,7 @@ private:
 		std::string target;
 	};
 
-	ReadFileCallback m_readFile;
+	ReadFile::Callback m_readFile;
 	bool m_optimize = false;
 	unsigned m_optimizeRuns = 200;
 	std::map<std::string, h160> m_libraries;
diff --git a/libsolidity/interface/ReadFile.h b/libsolidity/interface/ReadFile.h
new file mode 100644
index 00000000..2e8a6bd8
--- /dev/null
+++ b/libsolidity/interface/ReadFile.h
@@ -0,0 +1,45 @@
+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#include <string>
+#include <functional>
+#include <boost/noncopyable.hpp>
+
+namespace dev
+{
+
+namespace solidity
+{
+
+class ReadFile: boost::noncopyable
+{
+public:
+	/// File reading result.
+	struct Result
+	{
+		bool success;
+		std::string contentsOrErrorMessage;
+	};
+
+	/// File reading callback.
+	using Callback = std::function<Result(std::string const&)>;
+};
+
+}
+}