project_path.hpp
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project_path.hpp
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	/*******************************************************************************
	*
	* File: project_path.hpp
	*
	* Contents: Facility for compile-time manipulation of paths.
	*
	* Copyright 2017
	*
	* Author: David Juhasz (david.juhasz@tuwien.ac.at)
	*
	******************************************************************************/

	#ifndef ROSA_CONFIG_PROJECT_PATH_HPP
	#define ROSA_CONFIG_PROJECT_PATH_HPP

	#include "rosa/config/rosa_config.h"

	namespace rosa {

	// Nested namespace containing the implementation of the provided features,
	// not supposed to be used directly.
	namespace impl {

	// Implementation of the static search for the project-relative part of an
	// absolute path.
	constexpr size_t
	project_relative_path_index_impl(const char *const path,
	const char *const project = ROSA_SRC_DIR,
	const size_t index = 0) {
	return project[index] == '\0'
	? index // Found it.
	: (path[index] == '\0' \|\| project[index] != path[index])
	? 0 // Path is not under project.
	: project_relative_path_index_impl(
	path, project,
	index + 1); // Continue searching...
	}

	} // End namespace impl

	// Staticaly finds the index of the project-relative part of a absolute path.
	// Returns 0 if the absolute path is not located under the project directory.
	constexpr size_t project_relative_path_index(const char * const path) {
	return impl::project_relative_path_index_impl(path);
	}

	} // End namespace rosa

	#endif // ROSA_CONFIG_PROJECT_PATH_HPP