Directory.cpp

#include "Forward.h"
#include "Directory.h"

std::string Directory::DotDot(std::string dir) // Go up one directory from this directory, i.e. "/apple/pear" -> "/apple"
{
	size_t lastslash = dir.find_last_of('/');
	if (lastslash == std::string::npos || lastslash == 0)
		return "/";
	return dir.erase(lastslash, std::string::npos);
}

std::string Directory::lastword(std::string dir)
{
	size_t lastslashpos = dir.find_last_of('/');

	if (lastslashpos == std::string::npos) // If this directory lacks a slash (???)
	{
		return dir; // return itself
	}
	else if (dir[lastslashpos] == dir.back()) // If the slash is at the very end
	{
		return "";
	}

	return dir.substr(lastslashpos + 1, std::string::npos);
}

bool Directory::is_base_of(std::string base, std::string derived)
{
	if (base == "/")
		return true;
	if (derived == base)
		return false;
	while (true)
	{
		derived = Directory::DotDot(derived);
		if (derived == base)
			return true;
		if (base.length() > derived.length())
			return false;
	}
}

std::string string::replace_all(std::string hay, char needle, char cooler_needle) // Needle vs. the cooler needle
{
	size_t pos = hay.find_first_of(needle);
	while (pos != std::string::npos)
	{
		hay[pos] = cooler_needle;
		pos = hay.find_first_of(needle);
	}
	return hay;
}