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92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
#include "eval.hh"
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#include "util.hh"
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#include "fs-input-accessor.hh"
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namespace nix {
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SourcePath EvalState::rootPath(const Path & path)
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{
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return {rootFS, CanonPath(path)};
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}
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void EvalState::registerAccessor(ref<InputAccessor> accessor)
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{
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inputAccessors.emplace(accessor->number, accessor);
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}
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std::string EvalState::encodePath(const SourcePath & path)
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{
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/* For backward compatibility, return paths in the root FS
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normally. Encoding any other path is not very reproducible (due
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to /nix/store/virtual000...<N>) and we should deprecate it
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eventually. So print a warning about use of an encoded path in
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decodePath(). */
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return path.accessor == rootFS
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? path.path.abs()
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: fmt("%s%08x-source%s", virtualPathMarker, path.accessor->number, path.path.absOrEmpty());
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}
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SourcePath EvalState::decodePath(std::string_view s, PosIdx pos)
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{
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if (!hasPrefix(s, "/"))
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throwEvalError(pos, "string '%1%' doesn't represent an absolute path", s);
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if (hasPrefix(s, virtualPathMarker)) {
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auto fail = [s]() {
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throw Error("cannot decode virtual path '%s'", s);
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};
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s = s.substr(virtualPathMarker.size());
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try {
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auto slash = s.find('/');
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size_t number = std::stoi(std::string(s.substr(0, slash)), nullptr, 16);
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s = slash == s.npos ? "" : s.substr(slash);
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auto accessor = inputAccessors.find(number);
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if (accessor == inputAccessors.end()) fail();
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SourcePath path {accessor->second, CanonPath(s)};
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warn("applying 'toString' to path '%s' and then accessing it is deprecated, at %s", path, positions[pos]);
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return path;
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} catch (std::invalid_argument & e) {
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fail();
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abort();
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}
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} else
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return {rootFS, CanonPath(s)};
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}
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std::string EvalState::decodePaths(std::string_view s)
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{
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std::string res;
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size_t pos = 0;
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while (true) {
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auto m = s.find(virtualPathMarker, pos);
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if (m == s.npos) {
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res.append(s.substr(pos));
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return res;
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}
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res.append(s.substr(pos, m - pos));
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auto end = s.find_first_of(" \n\r\t'\"’:", m);
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if (end == s.npos) end = s.size();
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try {
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auto path = decodePath(s.substr(m, end - m), noPos);
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res.append(path.to_string());
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} catch (...) {
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throw;
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res.append(s.substr(pos, end - m));
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}
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pos = end;
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}
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}
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}
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