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#region Copyright notice and license
// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// http://github.com/jskeet/dotnet-protobufs/
// Original C++/Java/Python code:
// http://code.google.com/p/protobuf/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#endregion
using System;
using System.IO;
using System.Text;
namespace Google.ProtocolBuffers
{
/// <summary>
/// Helper class to control indentation. Used for TextFormat and by ProtoGen.
/// </summary>
public sealed class TextGenerator
{
/// <summary>
/// The string to use at the end of each line. We assume that "Print" is only called using \n
/// to indicate a line break; that's what we use to detect when we need to indent etc, and
/// *just* the \n is replaced with the contents of lineBreak.
/// </summary>
private readonly string lineBreak;
/// <summary>
/// Writer to write formatted text to.
/// </summary>
private readonly TextWriter writer;
/// <summary>
/// Keeps track of whether the next piece of text should be indented
/// </summary>
private bool atStartOfLine = true;
/// <summary>
/// Keeps track of the current level of indentation
/// </summary>
private readonly StringBuilder indent = new StringBuilder();
/// <summary>
/// Creates a generator writing to the given writer. The writer
/// is not closed by this class.
/// </summary>
public TextGenerator(TextWriter writer, string lineBreak)
{
this.writer = writer;
this.lineBreak = lineBreak;
}
/// <summary>
/// Indents text by two spaces. After calling Indent(), two spaces
/// will be inserted at the beginning of each line of text. Indent() may
/// be called multiple times to produce deeper indents.
/// </summary>
public void Indent()
{
indent.Append(" ");
}
/// <summary>
/// Reduces the current indent level by two spaces.
/// </summary>
public void Outdent()
{
if (indent.Length == 0)
{
throw new InvalidOperationException("Too many calls to Outdent()");
}
indent.Length -= 2;
}
public void WriteLine(string text)
{
Print(text);
Print("\n");
}
public void WriteLine(string format, params object[] args)
{
WriteLine(string.Format(format, args));
}
public void WriteLine()
{
WriteLine("");
}
/// <summary>
/// Prints the given text to the output stream, indenting at line boundaries.
/// </summary>
/// <param name="text"></param>
public void Print(string text)
{
int pos = 0;
for (int i = 0; i < text.Length; i++)
{
if (text[i] == '\n')
{
// Strip off the \n from what we write
Write(text.Substring(pos, i - pos));
Write(lineBreak);
pos = i + 1;
atStartOfLine = true;
}
}
Write(text.Substring(pos));
}
public void Write(string format, params object[] args)
{
Write(string.Format(format, args));
}
private void Write(string data)
{
if (data.Length == 0)
{
return;
}
if (atStartOfLine)
{
atStartOfLine = false;
writer.Write(indent);
}
writer.Write(data);
}
}
}
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