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#include <mbgl/util/url.hpp>
#include <iomanip>
#include <sstream>
#include <string>
#include <cstdlib>
#include <algorithm>
namespace {
// std::alnum etc. suffer from locale-dependence.
inline bool isAlphaCharacter(char c) {
return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
}
inline bool isAlphaNumericCharacter(char c) {
return isAlphaCharacter(c) || (c >= '0' && c <= '9');
}
inline bool isSchemeCharacter(char c) {
return isAlphaNumericCharacter(c) || c == '-' || c == '+' || c == '.';
}
} // namespace
namespace mbgl {
namespace util {
std::string percentEncode(const std::string& input) {
std::ostringstream encoded;
encoded.fill('0');
encoded << std::hex;
for (auto c : input) {
if (isAlphaNumericCharacter(c) || c == '-' || c == '_' || c == '.' || c == '~') {
encoded << c;
} else {
encoded << '%' << std::setw(2) << int(c);
}
}
return encoded.str();
}
std::string percentDecode(const std::string& input) {
std::string decoded;
auto it = input.begin();
const auto end = input.end();
char hex[3] = "00";
while (it != end) {
auto cur = std::find(it, end, '%');
decoded.append(it, cur);
it = cur;
if (cur != end) {
it += input.copy(hex, 2, cur - input.begin() + 1) + 1;
decoded += static_cast<char>(std::strtoul(hex, nullptr, 16));
}
}
return decoded;
}
// Checks whether the input string contains ://, and the part before it is all alphanumeric ASCII.
bool isURL(const std::string& input) {
auto it = input.begin();
// First character has to be alphabetic
if (it == input.end() || !isAlphaCharacter(*it++)) return false;
// The remaining characters of the scheme can be alphanumeric, or be one of +.-
while (it != input.end() && isSchemeCharacter(*it)) ++it;
// Check that :// follows
return (it != input.end() && *it++ == ':') &&
(it != input.end() && *it++ == '/') &&
(it != input.end() && *it++ == '/');
}
} // namespace util
} // namespace mbgl
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