atom.cpp
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atom.cpp
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	/*******************************************************************************
	*
	* File: atom.cpp
	*
	* Contents: Implementation of non-static part of atom facilities.
	*
	* Copyright 2017
	*
	* Author: David Juhasz (david.juhasz@tuwien.ac.at)
	*
	* This implementation is based on the atom implementation of CAF.
	* TODO: Check license.
	*
	******************************************************************************/

	#include "rosa/support/atom.hpp"
	#include <cstring>

	namespace rosa {

	std::string to_string(const AtomValue &What) {
	auto X = static_cast<atom_t>(What);
	std::string S;
	S.reserve(MaxAtomLength + 1);
	// Don't read characters before we found the leading 0xF.
	// First four bits set?
	bool ReadChars = ((X & 0xF000000000000000) >> 60) == 0xF;
	uint64_t Mask = 0x0FC0000000000000;
	for (int BitShift = 54; BitShift >= 0; BitShift -= 6, Mask >>= 6) {
	if (ReadChars) {
	S += AtomDecodingTable[(X & Mask) >> BitShift];
	} else if (((X & Mask) >> BitShift) == 0xF) {
	ReadChars = true;
	}
	}
	return S;
	}

	AtomValue atom_from_string(const std::string &S) {
	if (S.size() > MaxAtomLength) {
	return atom("");
	}
	char AtomBuf[MaxAtomLength + 1];
	std::memcpy(AtomBuf, S.c_str(), S.size());
	AtomBuf[S.size()] = '\0';
	return atom(AtomBuf);
	}

	} // End namespace rosa