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// variation.cpp
// this file is part of Context Free
// ---------------------
// Copyright (C) 2005-2008 Mark Lentczner - markl@glyphic.com
// Copyright (C) 2005-2015 John Horigan - john@glyphic.com
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// John Horigan can be contacted at john@glyphic.com or at
// John Horigan, 1209 Villa St., Mountain View, CA 94041-1123, USA
//
// Mark Lentczner can be contacted at markl@glyphic.com or at
// Mark Lentczner, 1209 Villa St., Mountain View, CA 94041-1123, USA
//
//
#include "variation.h"
#include "Rand64.h"
#include <random>
#include <limits>
#include <cstdint>
#include <cctype>
#include <cerrno>
int
Variation::fromString(const char* str)
{
while (std::isspace(static_cast<unsigned char>(*str))) ++str;
errno = 0;
if (!std::isalnum(static_cast<unsigned char>(*str))) return -1;
char* end = nullptr;
std::uint64_t v = std::strtoull(str, &end, 0);
if (errno == ERANGE)
return -1;
if (end != str) {
if (v > 0 && v <= std::numeric_limits<int>::max())
return static_cast<int>(v);
else
return -1;
}
std::uint64_t value = 0;
std::uint64_t offset = 0;
std::uint64_t range = 1;
while (char c = *str++) {
if (range > std::numeric_limits<int>::max())
return -1;
offset += range;
value *= 26;
if ('A' <= c && c <= 'Z') { value += c - 'A'; }
else if ('a' <= c && c <= 'z') { value += c - 'a'; }
else return -1;
range *= 26;
}
return (offset + value > std::numeric_limits<int>::max()) ?
-1 : static_cast<int>(offset + value);
}
std::string
Variation::toString(int ivar, bool lowerCase)
{
if (ivar < 1)
return "bad variation";
int length = 0;
std::uint64_t range = 1;
std::uint64_t var = ivar < 1 ? 1 : static_cast<std::uint64_t>(ivar);
while (var >= range && range < std::numeric_limits<int>::max()) {
length += 1;
var -= range;
range *= 26;
}
std::string str(length--, ' ');
while (length >= 0) {
char v = static_cast<char>(var % 26);
var = (var - v) / 26;
str[length--] = (lowerCase ? 'a' : 'A') + v;
}
return str;
}
int Variation::recommendedMin() { return 1; }
int Variation::recommendedMax(int letters)
{
int range = 0;
int value = 1;
if (letters < 1) letters = 1;
if (letters > 6) letters = 6;
for (int i = 0; i < letters; i++) {
value *= 26;
range += value;
}
return range;
}
int Variation::random(int letters)
{
static bool seeded = false;
if (!seeded) {
std::random_device rd;
Rand64::result_type seed = rd();
if (sizeof(std::random_device::result_type) < sizeof(Rand64::result_type))
seed = (seed << 32) | rd();
Rand64::Seed(seed);
seeded = true;
}
return static_cast<int>(Rand64::GetInt(recommendedMin(), recommendedMax(letters)));
}
#ifdef TEST_MAIN
#include <iostream>
using std::cout;
using std::endl;
using std::cin;
int
main(int argc, char* argv[])
{
cout << "Variation recommended range: "
<< Variation::recommendedMin() << ","
<< Variation::recommendedMax() << endl;
char buf[100];
while (!cin.bad()) {
cin.getline(buf, sizeof(buf)/sizeof(buf[0]));
char c = buf[0];
if (c == '.') {
int v = Variation::random();
std::string codeUpper = Variation::toString(v, false);
std::string codeLower = Variation::toString(v, true);
cout << "random picked " << v << endl;
cout << " or >" << codeUpper << "<" << endl;
cout << " or >" << codeLower << "<" << endl;
}
else if ('0' <= c && c <= '9') {
int v = atoi(buf);
std::string code = Variation::toString(v, false);
int v2 = Variation::fromString(code.c_str());
cout << v << " converted to >" << code << "<" << endl;
cout << " which converted back to " << v2 << endl;
}
else {
int v = Variation::fromString(buf);
std::string code = Variation::toString(v, false);
cout << ">" << buf << "< converted to " << v << endl;
cout << " which converted back to >" << code << "<" << endl;
}
}
return 0;
}
#endif
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