2 files changed, 26 insertions, 5 deletions
diff --git a/libsolidity/interface/CompilerStack.cpp b/libsolidity/interface/CompilerStack.cpp
index 38fe5956..7f097523 100644
--- a/libsolidity/interface/CompilerStack.cpp
+++ b/libsolidity/interface/CompilerStack.cpp
@@ -22,6 +22,7 @@
  */
 
 #include <boost/algorithm/string.hpp>
+#include <boost/filesystem.hpp>
 #include <libsolidity/ast/AST.h>
 #include <libsolidity/parsing/Scanner.h>
 #include <libsolidity/parsing/Parser.h>
@@ -367,7 +368,7 @@ void CompilerStack::resolveImports()
 	vector<Source const*> sourceOrder;
 	set<Source const*> sourcesSeen;
 
-	function<void(Source const*)> toposort = [&](Source const* _source)
+	function<void(string const&, Source const*)> toposort = [&](string const& _sourceName, Source const* _source)
 	{
 		if (sourcesSeen.count(_source))
 			return;
@@ -375,26 +376,44 @@ void CompilerStack::resolveImports()
 		for (ASTPointer<ASTNode> const& node: _source->ast->nodes())
 			if (ImportDirective const* import = dynamic_cast<ImportDirective*>(node.get()))
 			{
-				string const& id = import->identifier();
-				if (!m_sources.count(id))
+				string path = absolutePath(import->identifier(), _sourceName);
+				import->annotation().absolutePath = path;
+				if (!m_sources.count(path))
 					BOOST_THROW_EXCEPTION(
 						Error(Error::Type::ParserError)
 							<< errinfo_sourceLocation(import->location())
 							<< errinfo_comment("Source not found.")
 					);
 
-				toposort(&m_sources[id]);
+				toposort(path, &m_sources[path]);
 			}
 		sourceOrder.push_back(_source);
 	};
 
 	for (auto const& sourcePair: m_sources)
 		if (!sourcePair.second.isLibrary)
-			toposort(&sourcePair.second);
+			toposort(sourcePair.first, &sourcePair.second);
 
 	swap(m_sourceOrder, sourceOrder);
 }
 
+string CompilerStack::absolutePath(string const& _path, string const& _reference) const
+{
+	// Anything that does not start with `.` is an absolute path.
+	if (_path.empty() || _path.front() != '.')
+		return _path;
+	using path = boost::filesystem::path;
+	path p(_path);
+	path result(_reference);
+	result.remove_filename();
+	for (path::iterator it = p.begin(); it != p.end(); ++it)
+		if (*it == "..")
+			result = result.parent_path();
+		else if (*it != ".")
+			result /= *it;
+	return result.string();
+}
+
 void CompilerStack::compileContract(
 	bool _optimize,
 	unsigned _runs,
diff --git a/libsolidity/interface/CompilerStack.h b/libsolidity/interface/CompilerStack.h
index 0473d58b..3e6dc456 100644
--- a/libsolidity/interface/CompilerStack.h
+++ b/libsolidity/interface/CompilerStack.h
@@ -199,6 +199,8 @@ private:
 	};
 
 	void resolveImports();
+	/// @returns the absolute path corresponding to @a _path relative to @a _reference.
+	std::string absolutePath(std::string const& _path, std::string const& _reference) const;
 	/// Compile a single contract and put the result in @a _compiledContracts.
 	void compileContract(
 		bool _optimize,