/*
 * BDSM2
 * Author: Adam Sawicki
 * http://www.regedit.risp.pl
 * mailto:regedit@risp.pl
 */
#include "pch.hpp"
#include <sstream>
#include "Source.hpp"

string Source::Iterator::ToString() const
{
	std::ostringstream ss;
	ss << "index: " << (unsigned)Index << ", row: " << Row << ", col: " << Col;
	return ss.str();
}

void Source::Forward()
{
	if (Peek() == '\r')
	{
	}
	else if (Peek() == '\n')
	{
		m_Index.Row++;
		m_Index.Col = 1;
	}
	else
		m_Index.Col++;

	m_Index.Index++;
}

char Source::Get()
{
	char ch = Peek();
	Forward();
	return ch;
}

Source::Source(const string *Src) : m_Src(Src), m_ErrIndexSaved(false)
{
	m_Index.Index = 0;
	m_Index.Row = 1;
	m_Index.Col = 1;
}

char Source::GetS()
{
	if (End())
		SrcError("Unexpected end of file", ERR_PARSE);
	return Get();
}

void Source::Skip()
{
	char ch;
	while (!End())
	{
		ch = Peek();
		// Whitespace
		if (ch == ' ' || ch == '\t' || ch == '\v' || ch == '\r' || ch == '\n')
			Forward();
		// Comment
		else if (ch == '{')
		{
			Forward();
			for (;;)
			{
				if (End())
					SrcError("Unexpected end of comment", ERR_PARSE);
				ch = Peek();
				Forward();
				if (ch == '}')
					break;
			}
		}
		else
			break;
	}
}

void Source::SrcError(const string &msg, ERR_PLACE place)
{
	Error(msg + " (" + GetIterator().ToString() + ')', place);
}