/**
  *
  *                      OOAS Compiler
  *
  *       Copyright 2015, AIT Austrian Institute of Technology.
  * This code is based on the C# Version of the OOAS Compiler, which is
  * copyright 2015 by the Institute of Software Technology, Graz University
  * of Technology with portions copyright by the AIT Austrian Institute of
  * Technology. All rights reserved.
  *
  * SEE THE "LICENSE" FILE FOR THE TERMS UNDER WHICH THIS FILE IS PROVIDED.
  *
  * If you modify the file please update the list of contributors below to in-
  * clude your name. Please also stick to the coding convention of using TABs
  * to do the basic (block-level) indentation and spaces for anything after
  * that. (Enable the display of special chars and it should be pretty obvious
  * what this means.) Also, remove all trailing whitespace.
  *
  * Contributors:
  *               Willibald Krenn (AIT)
  *               Stephan Zimmerer (AIT)
  *               Markus Demetz (AIT)
  *               Christoph Czurda (AIT)
  *
  */


package org.momut.ooas.codegen;

/// <summary>
/// Class that is used as text buffer during code emission
/// </summary>
public class OoasCodeEmitter
{
	private StringBuilder output;
	private int indentLevel;
	private final int indentTabWidth;


	public OoasCodeEmitter()
	{
		indentLevel = 0;
		indentTabWidth = 4;
		output = new StringBuilder();
	}

	public void Indent()
	{
		for (int i = 0; i < indentLevel * indentTabWidth; i++)
			output.append(" ");
	}

	public void Append(int num)
	{
		output.append(num);
	}

	public void Append(String text)
	{
		output.append(text);
	}

	public void AppendLineIncIndent(String text)
	{
		indentLevel++;
		this.AppendLine(text);
	}

	public void AppendLineDecIndent(String text)
	{
		if (indentLevel > 0)
		{
			indentLevel--;
			int startIndex = output.length() - indentTabWidth;
			output.delete(startIndex, output.length());
		}
		this.AppendLine(text);
	}


	public void AppendLine(String text)
	{
		output.append(text);
		output.append("\n");
		Indent();
	}

	public void AppendLine()
	{
		output.append("\n");
		Indent();
	}



	public void IncIndent()
	{
		indentLevel++;
	}

	public void DecIndent()
	{
		indentLevel--;
	}

	public void Clear()
	{
		output = new StringBuilder();
	}


	@Override
	public String toString()
	{
		return output.toString();
	}

}