forked from lix-project/lix
72 lines
1.8 KiB
C++
72 lines
1.8 KiB
C++
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#include "attrs.hh"
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#include "fetchers.hh"
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#include <nlohmann/json.hpp>
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namespace nix::fetchers {
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Attrs jsonToAttrs(const nlohmann::json & json)
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{
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Attrs attrs;
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for (auto & i : json.items()) {
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if (i.value().is_number())
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attrs.emplace(i.key(), i.value().get<int64_t>());
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else if (i.value().is_string())
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attrs.emplace(i.key(), i.value().get<std::string>());
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else
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throw Error("unsupported input attribute type in lock file");
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}
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return attrs;
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}
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nlohmann::json attrsToJson(const Attrs & attrs)
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{
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nlohmann::json json;
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for (auto & attr : attrs) {
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if (auto v = std::get_if<int64_t>(&attr.second)) {
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json[attr.first] = *v;
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} else if (auto v = std::get_if<std::string>(&attr.second)) {
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json[attr.first] = *v;
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} else abort();
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}
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return json;
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}
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std::optional<std::string> maybeGetStrAttr(const Attrs & attrs, const std::string & name)
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{
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auto i = attrs.find(name);
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if (i == attrs.end()) return {};
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if (auto v = std::get_if<std::string>(&i->second))
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return *v;
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throw Error("input attribute '%s' is not a string", name);
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}
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std::string getStrAttr(const Attrs & attrs, const std::string & name)
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{
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auto s = maybeGetStrAttr(attrs, name);
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if (!s)
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throw Error("input attribute '%s' is missing", name);
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return *s;
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}
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std::optional<int64_t> maybeGetIntAttr(const Attrs & attrs, const std::string & name)
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{
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auto i = attrs.find(name);
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if (i == attrs.end()) return {};
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if (auto v = std::get_if<int64_t>(&i->second))
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return *v;
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throw Error("input attribute '%s' is not a string", name);
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}
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int64_t getIntAttr(const Attrs & attrs, const std::string & name)
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{
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auto s = maybeGetIntAttr(attrs, name);
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if (!s)
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throw Error("input attribute '%s' is missing", name);
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return *s;
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}
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}
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