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//
// Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
// Copyright (c) 2022-2024 Alexander Grund
//
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/locale/util/locale_data.hpp>
#include <boost/locale/util/string.hpp>
#include "encoding.hpp"
#include <boost/assert.hpp>
#include <algorithm>
#include <stdexcept>
#include <string>
namespace boost { namespace locale { namespace util {
/// Convert uppercase ASCII to lower case, return true if converted
static bool make_lower(char& c)
{
if(is_upper_ascii(c)) {
c += 'a' - 'A';
return true;
} else
return false;
}
/// Convert lowercase ASCII to upper case, return true if converted
static bool make_upper(char& c)
{
if(is_lower_ascii(c)) {
c += 'A' - 'a';
return true;
} else
return false;
}
locale_data::locale_data()
{
reset();
}
locale_data::locale_data(const std::string& locale_name)
{
if(!parse(locale_name))
throw std::invalid_argument("Failed to parse locale name: " + locale_name);
}
void locale_data::reset()
{
language_ = "C";
script_.clear();
country_.clear();
encoding_ = "US-ASCII";
variant_.clear();
utf8_ = false;
}
std::string locale_data::to_string() const
{
std::string result = language_;
if(!script_.empty())
(result += '_') += script_;
if(!country_.empty())
(result += '_') += country_;
if(!encoding_.empty() && !util::are_encodings_equal(encoding_, "US-ASCII"))
(result += '.') += encoding_;
if(!variant_.empty())
(result += '@') += variant_;
return result;
}
bool locale_data::parse(const std::string& locale_name)
{
reset();
return parse_from_lang(locale_name);
}
bool locale_data::parse_from_lang(const std::string& input)
{
const auto end = input.find_first_of("-_@.");
std::string tmp = input.substr(0, end);
if(tmp.empty())
return false;
// lowercase ASCII
for(char& c : tmp) {
if(!is_lower_ascii(c) && !make_lower(c))
return false;
}
if(tmp != "c" && tmp != "posix") // Keep default
language_ = tmp;
if(end >= input.size())
return true;
else if(input[end] == '-' || input[end] == '_')
return parse_from_script(input.substr(end + 1));
else if(input[end] == '.')
return parse_from_encoding(input.substr(end + 1));
else {
BOOST_ASSERT_MSG(input[end] == '@', "Unexpected delimiter");
return parse_from_variant(input.substr(end + 1));
}
}
bool locale_data::parse_from_script(const std::string& input)
{
const auto end = input.find_first_of("-_@.");
std::string tmp = input.substr(0, end);
// Script is exactly 4 ASCII characters, otherwise it is not present
if(tmp.length() != 4)
return parse_from_country(input);
for(char& c : tmp) {
if(!is_lower_ascii(c) && !make_lower(c))
return parse_from_country(input);
}
make_upper(tmp[0]); // Capitalize first letter only
script_ = tmp;
if(end >= input.size())
return true;
else if(input[end] == '-' || input[end] == '_')
return parse_from_country(input.substr(end + 1));
else if(input[end] == '.')
return parse_from_encoding(input.substr(end + 1));
else {
BOOST_ASSERT_MSG(input[end] == '@', "Unexpected delimiter");
return parse_from_variant(input.substr(end + 1));
}
}
bool locale_data::parse_from_country(const std::string& input)
{
if(language_ == "C")
return false;
const auto end = input.find_first_of("@.");
std::string tmp = input.substr(0, end);
if(tmp.empty())
return false;
// Make uppercase
for(char& c : tmp)
make_upper(c);
// If it's ALL uppercase ASCII, assume ISO 3166 country id
if(std::find_if_not(tmp.begin(), tmp.end(), util::is_upper_ascii) != tmp.end()) {
// else handle special cases:
// - en_US_POSIX is an alias for C
// - M49 country code: 3 digits
if(language_ == "en" && tmp == "US_POSIX") {
language_ = "C";
tmp.clear();
} else if(tmp.size() != 3u || std::find_if_not(tmp.begin(), tmp.end(), util::is_numeric_ascii) != tmp.end())
return false;
}
country_ = tmp;
if(end >= input.size())
return true;
else if(input[end] == '.')
return parse_from_encoding(input.substr(end + 1));
else {
BOOST_ASSERT_MSG(input[end] == '@', "Unexpected delimiter");
return parse_from_variant(input.substr(end + 1));
}
}
bool locale_data::parse_from_encoding(const std::string& input)
{
const auto end = input.find_first_of('@');
std::string tmp = input.substr(0, end);
if(tmp.empty())
return false;
// No assumptions, but uppercase
encoding(std::move(tmp));
if(end >= input.size())
return true;
else {
BOOST_ASSERT_MSG(input[end] == '@', "Unexpected delimiter");
return parse_from_variant(input.substr(end + 1));
}
}
bool locale_data::parse_from_variant(const std::string& input)
{
if(language_ == "C")
return false;
if(input.empty())
return false;
variant_ = input;
// No assumptions, just make it lowercase
for(char& c : variant_)
make_lower(c);
return true;
}
locale_data& locale_data::encoding(std::string new_encoding, const bool uppercase)
{
if(uppercase) {
for(char& c : new_encoding)
make_upper(c);
}
encoding_ = std::move(new_encoding);
utf8_ = util::normalize_encoding(encoding_) == "utf8";
return *this;
}
}}} // namespace boost::locale::util
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