1 files changed, 97 insertions, 0 deletions
diff --git a/liblangutil/SourceLocation.h b/liblangutil/SourceLocation.h
new file mode 100644
index 00000000..2d18a7d1
--- /dev/null
+++ b/liblangutil/SourceLocation.h
@@ -0,0 +1,97 @@
+/*
+    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 <libdevcore/Common.h> // defines noexcept macro for MSVC
+#include <liblangutil/CharStream.h>
+#include <memory>
+#include <string>
+#include <ostream>
+#include <tuple>
+
+namespace langutil
+{
+
+/**
+ * Representation of an interval of source positions.
+ * The interval includes start and excludes end.
+ */
+struct SourceLocation
+{
+	SourceLocation(): start(-1), end(-1), source{nullptr} { }
+	SourceLocation(int _start, int _end, std::shared_ptr<CharStream> _source):
+		start(_start), end(_end), source{std::move(_source)} { }
+
+	bool operator==(SourceLocation const& _other) const
+	{
+		return source.get() == _other.source.get() && start == _other.start && end == _other.end;
+	}
+	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<CharStream> source;
+};
+
+/// 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";
+
+	if (_location.source)
+		_out << _location.source->name();
+
+	_out << "[" << _location.start << "," << _location.end << ")";
+
+	return _out;
+}
+
+bool SourceLocation::operator<(SourceLocation const& _other) const
+{
+	if (!source|| !_other.source)
+		return std::make_tuple(int(!!source), start, end) < std::make_tuple(int(!!_other.source), _other.start, _other.end);
+	else
+		return std::make_tuple(source->name(), start, end) < std::make_tuple(_other.source->name(), _other.start, _other.end);
+}
+
+bool SourceLocation::contains(SourceLocation const& _other) const
+{
+	if (isEmpty() || _other.isEmpty() || source.get() != _other.source.get())
+		return false;
+	return start <= _other.start && _other.end <= end;
+}
+
+bool SourceLocation::intersects(SourceLocation const& _other) const
+{
+	if (isEmpty() || _other.isEmpty() || source.get() != _other.source.get())
+		return false;
+	return _other.start < end && start < _other.end;
+}
+
+}