code.cpp

a basic interpreter free basic

#include "StdAfx.h"
#include "Code.h"

CCode::CCode(void)
: m_LineNumber(0)
{
	this->m_Code = new codelinelist_t();
}

CCode::~CCode(void)
{
	codelinelist_t::iterator cLine = this->m_Code->begin();

	while(cLine != this->m_Code->end())
	{
		CCodeLine *currentLine = *cLine;
		delete currentLine;
		cLine++;
	}

	delete this->m_Code;
}

// Add a line of code to the listing
void CCode::Add(CCodeLine * CodeLine)
{
	// If there is already a line of code under this
	// line number, replace it
	CCodeLine *thisCodeLine = this->Find(CodeLine->GetLineNumber());
	if(thisCodeLine != NULL)
	{
		// Check to see if we were passed an empty line,
		// in which case, just delete the line of code
		if(CodeLine->GetCode().length() == 0)
		{
			this->m_Code->remove(thisCodeLine);
		}
		else
		{
			thisCodeLine->SetCode(CodeLine->GetCode());
		}
	}
	else
	{
		// Otherwise, push the symbol onto the list
		this->m_Code->push_back(CodeLine);
	}
	
	// Sort the source listing into ascending numeric order
	this->m_Code->sort(CCodeLine::Compare);

	// Make sure that the iterator is pointing at the end of the listing,
	// since we're adding lines of code
	this->m_CodeIterator = this->m_Code->end();
}

// Find a line of code by line number
CCodeLine * CCode::Find(unsigned int LineNumber)
{
	// Iterate over the source listing, find the line that
	// matches and return
	codelinelist_t::iterator codeline = this->m_Code->begin();

	while(codeline != this->m_Code->end())
	{
		CCodeLine *thisCodeLine = *codeline;
		if(thisCodeLine->GetLineNumber() == LineNumber)
		{
			this->m_LineNumber = LineNumber;

			// Set the iterator to equal the codeline in question
			this->m_CodeIterator = codeline;

			return thisCodeLine;
		}

		codeline++;
	}

	// If it wasn't found, just return null
	return NULL;
}

// Get the next code line
CCodeLine * CCode::GetNext(void)
{
	if(this->m_CodeIterator == this->m_Code->end())
	{
		return NULL;
	}

	CCodeLine *curline = *this->m_CodeIterator;
	this->m_LineNumber = curline->GetLineNumber();

	this->m_CodeIterator++;

	return curline;
}

// Reset the code iterator
void CCode::Reset(void)
{
	this->m_CodeIterator = this->m_Code->begin();
	this->m_LineNumber = 0;
}

// Get the current line number
int CCode::GetCurrentLineNumber(void)
{
	return this->m_LineNumber;
}