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#ifndef MBGL_UTIL_TOKEN
#define MBGL_UTIL_TOKEN
#include <map>
#include <string>
#include <algorithm>
namespace mbgl {
namespace util {
// Replaces {tokens} in a string by calling the lookup function.
template <typename Lookup>
std::string replaceTokens(const std::string &source, const Lookup &lookup) {
std::string result;
result.reserve(source.size());
auto pos = source.begin();
const auto end = source.end();
while (pos != end) {
auto brace = std::find(pos, end, '{');
result.append(pos, brace);
pos = brace;
if (pos != end) {
for (brace++; brace != end && (std::isalnum(*brace) || *brace == '_'); brace++);
if (brace != end && *brace == '}') {
result.append(lookup({ pos + 1, brace }));
pos = brace + 1;
} else {
result.append(pos, brace);
pos = brace;
}
}
}
return result;
}
template <typename T>
inline std::string replaceTokens(const std::string &source, const std::map<std::string, T> &properties) {
return replaceTokens(source, [&properties](const std::string &token) -> std::string {
const auto it_prop = properties.find(token);
return it_prop != properties.end() ? toString(it_prop->second) : "";
});
}
} // end namespace util
} // end namespace mbgl
#endif
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