ac89bb064a
All OS and IO operations should be moved out, leaving only some misc portable pure functions. This is useful to avoid copious CPP when doing things like Windows and Emscripten ports. Newly exposed functions to break cycles: - `restoreSignals` - `updateWindowSize`
56 lines
1.2 KiB
C++
56 lines
1.2 KiB
C++
#include "search-path.hh"
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namespace nix {
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std::optional<std::string_view> SearchPath::Prefix::suffixIfPotentialMatch(
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std::string_view path) const
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{
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auto n = s.size();
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/* Non-empty prefix and suffix must be separated by a /, or the
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prefix is not a valid path prefix. */
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bool needSeparator = n > 0 && n < path.size();
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if (needSeparator && path[n] != '/') {
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return std::nullopt;
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}
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/* Prefix must be prefix of this path. */
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if (path.compare(0, n, s) != 0) {
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return std::nullopt;
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}
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/* Skip next path separator. */
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return {
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path.substr(needSeparator ? n + 1 : n)
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};
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}
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SearchPath::Elem SearchPath::Elem::parse(std::string_view rawElem)
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{
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size_t pos = rawElem.find('=');
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return SearchPath::Elem {
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.prefix = Prefix {
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.s = pos == std::string::npos
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? std::string { "" }
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: std::string { rawElem.substr(0, pos) },
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},
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.path = Path {
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.s = std::string { rawElem.substr(pos + 1) },
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},
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};
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}
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SearchPath parseSearchPath(const Strings & rawElems)
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{
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SearchPath res;
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for (auto & rawElem : rawElems)
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res.elements.emplace_back(SearchPath::Elem::parse(rawElem));
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return res;
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}
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}
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