public void TestIndentingWriter()
{
char[] line1 = new char[] { 'l', 'i', 'n', 'e', '1' };
char nl = '\n';
char[] line2 = new char[] { 'z', 'l', 'i', 'n', 'e', '2' };
string line3 = "\nline3";
StringWriter strWriter = new StringWriter();
IndentingWriter indWriter = new IndentingWriter(strWriter, 4);
Assert.AreEqual(indWriter.Encoding, strWriter.Encoding);
indWriter.Write(line1);
indWriter.Write(nl);
indWriter.Write(line2, 1, 5);
indWriter.Write(line3);
Assert.AreEqual(" line1\n line2\n line3", strWriter.ToString());
strWriter = new StringWriter();
indWriter = new IndentingWriter(strWriter, 4);
indWriter.Suspend();
indWriter.Write(line1);
indWriter.Write(nl);
indWriter.Write(line2, 1, 5);
indWriter.Write(line3);
Assert.AreEqual("line1\nline2\nline3", strWriter.ToString());
indWriter.Resume();
indWriter.WriteLine();
Assert.AreEqual("line1\nline2\nline3\r\n", strWriter.ToString());
indWriter.Write(line1);
Assert.AreEqual("line1\nline2\nline3\r\n line1", strWriter.ToString());
strWriter = new StringWriter();
indWriter = new IndentingWriter(strWriter, "ZZZ");
indWriter.Write(line1);
indWriter.Write(nl);
indWriter.Write(line2, 1, 5);
indWriter.Write(line3);
Assert.AreEqual("ZZZline1\nZZZline2\nZZZline3", strWriter.ToString());
strWriter = new StringWriter();
indWriter = new IndentingWriter(strWriter, "ZZZ");
indWriter.Suspend();
indWriter.Write(line1);
indWriter.Write(nl);
indWriter.Write(line2, 1, 5);
indWriter.Write(line3);
Assert.AreEqual("line1\nline2\nline3", strWriter.ToString());
strWriter = new StringWriter();
indWriter = new IndentingWriter(strWriter, "ZZZ");
IndentingWriter indWriter2 = new IndentingWriter(indWriter, "XXX");
indWriter2.Write(line1);
indWriter2.Write(nl);
indWriter2.Write(line2, 1, 5);
indWriter2.Write(line3);
Assert.AreEqual("ZZZXXXline1\nZZZXXXline2\nZZZXXXline3", strWriter.ToString());
}
/// <summary>
/// Construct an IndentingWriter that indents using an indention
/// string.
/// </summary>
/// <param name="writer">
/// The underlying <b>TextWriter</b> to write to.
/// </param>
/// <param name="indent">
/// The string value to indent each line with.
/// </param>
public IndentingWriter(TextWriter writer, string indent)
{
m_writer = writer;
if (indent.IndexOf('\n') >= 0)
{
throw new ArgumentException("indent contains new line char");
}
// if this and underlying writers are both indenting writers, combine
// the indentation strings
Type type = typeof(IndentingWriter);
if (GetType() == type && writer.GetType() == type)
{
IndentingWriter that = (IndentingWriter)writer;
indent = new StringBuilder().Append(that.m_achIndent).Append(indent).ToString();
m_writer = that.m_writer;
}
m_achIndent = indent.ToCharArray();
}
