Michal Sojka
8ec1ba0210
This will allow documenting them (in later commits). Note that we keep the old constructor even if it is no longer used by Nix code, because it is used in tests/plugins/plugintest.cc, which suggests that it might be used by some external plugin.
100 lines
3.1 KiB
C++
100 lines
3.1 KiB
C++
#include "primops.hh"
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#include "eval-inline.hh"
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#include "../../toml11/toml.hpp"
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#include <sstream>
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namespace nix {
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static void prim_fromTOML(EvalState & state, const PosIdx pos, Value * * args, Value & val)
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{
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auto toml = state.forceStringNoCtx(*args[0], pos, "while evaluating the argument passed to builtins.fromTOML");
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std::istringstream tomlStream(std::string{toml});
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std::function<void(Value &, toml::value)> visit;
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visit = [&](Value & v, toml::value t) {
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switch(t.type())
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{
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case toml::value_t::table:
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{
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auto table = toml::get<toml::table>(t);
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size_t size = 0;
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for (auto & i : table) { (void) i; size++; }
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auto attrs = state.buildBindings(size);
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for(auto & elem : table)
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visit(attrs.alloc(elem.first), elem.second);
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v.mkAttrs(attrs);
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}
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break;;
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case toml::value_t::array:
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{
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auto array = toml::get<std::vector<toml::value>>(t);
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size_t size = array.size();
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state.mkList(v, size);
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for (size_t i = 0; i < size; ++i)
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visit(*(v.listElems()[i] = state.allocValue()), array[i]);
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}
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break;;
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case toml::value_t::boolean:
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v.mkBool(toml::get<bool>(t));
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break;;
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case toml::value_t::integer:
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v.mkInt(toml::get<int64_t>(t));
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break;;
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case toml::value_t::floating:
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v.mkFloat(toml::get<NixFloat>(t));
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break;;
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case toml::value_t::string:
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v.mkString(toml::get<std::string>(t));
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break;;
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case toml::value_t::local_datetime:
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case toml::value_t::offset_datetime:
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case toml::value_t::local_date:
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case toml::value_t::local_time:
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{
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if (experimentalFeatureSettings.isEnabled(Xp::ParseTomlTimestamps)) {
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auto attrs = state.buildBindings(2);
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attrs.alloc("_type").mkString("timestamp");
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std::ostringstream s;
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s << t;
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attrs.alloc("value").mkString(s.str());
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v.mkAttrs(attrs);
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} else {
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throw std::runtime_error("Dates and times are not supported");
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}
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}
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break;;
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case toml::value_t::empty:
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v.mkNull();
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break;;
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}
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};
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try {
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visit(val, toml::parse(tomlStream, "fromTOML" /* the "filename" */));
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} catch (std::exception & e) { // TODO: toml::syntax_error
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throw EvalError({
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.msg = hintfmt("while parsing a TOML string: %s", e.what()),
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.errPos = state.positions[pos]
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});
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}
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}
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static RegisterPrimOp primop_fromTOML({
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.name = "fromTOML",
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.arity = 1,
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.fun = prim_fromTOML
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});
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}
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