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