/**
  *
  *                  OOAS Compiler - C++ AST
  *
  * Copyright 2015, 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)
  *               Christoph Czurda (AIT)
  *
  */




#pragma once

#include <string>
#include <cstdint>
#include <boost/format.hpp>


namespace Ast {

/**
 * Shameless copy of the Java "CodeEmitter"...
 */

class TextEmitter
{
protected:
	std::string m_output;
	unsigned int m_indentLevel;
	const unsigned int m_indentTabWidth;

public:
	TextEmitter():
		m_output (""),
		m_indentLevel (0),
		m_indentTabWidth(4)
	{}

	void indent()
	{
		for (unsigned int i = 0; i < m_indentLevel * m_indentTabWidth; i++)
			m_output += " ";
	}

	void append(const boost::format& msg) {
		append(msg.str());
	}

	void append(std::int64_t num)
	{
		m_output += std::to_string(num);
	}

	void append(const std::string& text)
	{
		m_output += text;
	}

	void append(const char* text)
	{
		m_output += text;
	}

	void appendLineIncIndent(std::string& text)
	{
		m_indentLevel++;
		appendLine(text);
	}

	void appendLineDecIndent(std::string& text)
	{
		if (m_indentLevel > 0)
		{
			m_indentLevel--;
			string::size_type startIndex = m_output.length() - m_indentTabWidth;
			m_output = m_output.erase(startIndex, std::string::npos);
		}
		appendLine(text);
	}

	void appendLine(const boost::format& msg) {
		appendLine(msg.str());
	}

	void appendLine(const char* text)
	{
		m_output += text;
		appendLine();
	}

	void appendLine(const std::string& text)
	{
		appendLine(text.c_str());
	}

	void appendLine()
	{
		m_output += "\n";
		indent();
	}



	void incIndent()
	{
		m_indentLevel++;
	}

	void decIndent()
	{
		m_indentLevel--;
	}

	void clear()
	{
		m_output = "";
	}


	std::string& toString()
	{
		return m_output;
	}
};

} /* namespace Ast */