1 files changed, 105 insertions, 0 deletions
diff --git a/liblangutil/SourceLocation.h b/liblangutil/SourceLocation.h
new file mode 100644
index 00000000..b42c3aa9
--- /dev/null
+++ b/liblangutil/SourceLocation.h
@@ -0,0 +1,105 @@
+/*
+    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/>.
+*/
+/**
+ * @author Lefteris Karapetsas <lefteris@ethdev.com>
+ * @date 2015
+ * Represents a location in a source file
+ */
+
+#pragma once
+
+#include <memory>
+#include <string>
+#include <ostream>
+#include <tuple>
+#include <libdevcore/Common.h> // defines noexcept macro for MSVC
+
+namespace dev
+{
+
+/**
+ * Representation of an interval of source positions.
+ * The interval includes start and excludes end.
+ */
+struct SourceLocation
+{
+	SourceLocation(): start(-1), end(-1) { }
+	SourceLocation(int _start, int _end, std::shared_ptr<std::string const> _sourceName):
+		start(_start), end(_end), sourceName(_sourceName) { }
+	SourceLocation(SourceLocation&& _other) noexcept:
+		start(_other.start),
+		end(_other.end),
+		sourceName(std::move(_other.sourceName))
+	{}
+	SourceLocation(SourceLocation const&) = default;
+	SourceLocation& operator=(SourceLocation const&) = default;
+	SourceLocation& operator=(SourceLocation&& _other) noexcept
+	{
+		start = _other.start;
+		end = _other.end;
+		sourceName = std::move(_other.sourceName);
+		return *this;
+	}
+
+	bool operator==(SourceLocation const& _other) const
+	{
+		return start == _other.start && end == _other.end &&
+			((!sourceName && !_other.sourceName) || (sourceName && _other.sourceName && *sourceName == *_other.sourceName));
+	}
+	bool operator!=(SourceLocation const& _other) const { return !operator==(_other); }
+	inline bool operator<(SourceLocation const& _other) const;
+	inline bool contains(SourceLocation const& _other) const;
+	inline bool intersects(SourceLocation const& _other) const;
+
+	bool isEmpty() const { return start == -1 && end == -1; }
+
+	int start;
+	int end;
+	std::shared_ptr<std::string const> sourceName;
+};
+
+/// Stream output for Location (used e.g. in boost exceptions).
+inline std::ostream& operator<<(std::ostream& _out, SourceLocation const& _location)
+{
+	if (_location.isEmpty())
+		return _out << "NO_LOCATION_SPECIFIED";
+	return _out << *_location.sourceName << "[" << _location.start << "," << _location.end << ")";
+}
+
+bool SourceLocation::operator<(SourceLocation const& _other) const
+{
+	if (!sourceName || !_other.sourceName)
+		return std::make_tuple(int(!!sourceName), start, end) < std::make_tuple(int(!!_other.sourceName), _other.start, _other.end);
+	else
+		return std::make_tuple(*sourceName, start, end) < std::make_tuple(*_other.sourceName, _other.start, _other.end);
+}
+
+bool SourceLocation::contains(SourceLocation const& _other) const
+{
+	if (isEmpty() || _other.isEmpty() || ((!sourceName || !_other.sourceName || *sourceName != *_other.sourceName) && (sourceName || _other.sourceName)))
+		return false;
+	return start <= _other.start && _other.end <= end;
+}
+
+bool SourceLocation::intersects(SourceLocation const& _other) const
+{
+	if (isEmpty() || _other.isEmpty() || ((!sourceName || !_other.sourceName || *sourceName != *_other.sourceName) && (sourceName || _other.sourceName)))
+		return false;
+	return _other.start < end && start < _other.end;
+}
+
+}