Introduce IndentedWriter

libdevcore/IndentedWriter.cpp

@@ -0,0 +1,65 @@
+/*
+	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.
+ */
+
+#include <libdevcore/IndentedWriter.h>
+#include <libdevcore/Assertions.h>
+
+using namespace std;
+using namespace dev;
+
+string IndentedWriter::format() const
+{
+	string result;
+	for (auto const& line: m_lines)
+		result += string(line.indentation * 4, ' ') + line.contents + "\n";
+	return result;
+}
+
+void IndentedWriter::newLine()
+{
+	if (!m_lines.back().contents.empty())
+		m_lines.push_back({ string(), m_lines.back().indentation });
+}
+
+void IndentedWriter::indent()
+{
+	newLine();
+	m_lines.back().indentation++;
+}
+
+void IndentedWriter::unindent()
+{
+	newLine();
+	assertThrow(m_lines.back().indentation > 0, IndentedWriterError, "Negative indentation.");
+	m_lines.back().indentation--;
+}
+
+void IndentedWriter::add(string const& _str)
+{
+	m_lines.back().contents += _str;
+}
+
+void IndentedWriter::addLine(string const& _line)
+{
+	newLine();
+	add(_line);
+	newLine();
+}