1 files changed, 67 insertions, 0 deletions
diff --git a/libdevcore/IndentedWriter.h b/libdevcore/IndentedWriter.h
new file mode 100644
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+++ b/libdevcore/IndentedWriter.h
@@ -0,0 +1,67 @@
+/*
+	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/>.
+*/
+/**
+ * @date 2017
+ * Indented text writer.
+ */
+
+#pragma once
+
+#include <vector>
+#include <string>
+
+#include <libdevcore/Exceptions.h>
+
+namespace dev
+{
+
+DEV_SIMPLE_EXCEPTION(IndentedWriterError);
+
+class IndentedWriter
+{
+public:
+	explicit IndentedWriter(): m_lines(std::vector<Line>{{std::string(), 0}}) {}
+
+	// Returns the formatted output.
+	std::string format() const;
+
+	// Go one indentation level in.
+	void indent();
+
+	// Go one indentation level out.
+	void unindent();
+
+	// Add text.
+	void add(std::string const& _str);
+
+	// Add text with new line.
+	void addLine(std::string const& _line);
+
+	// Add new line.
+	void newLine();
+
+private:
+	struct Line
+	{
+		std::string contents;
+		unsigned indentation;
+	};
+
+	std::vector<Line> m_lines;
+};
+
+}