82 lines
2.6 KiB
C++
82 lines
2.6 KiB
C++
#include "lix/libexpr/eval.hh"
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#include "lix/libexpr/extra-primops.hh"
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#include "lix/libexpr/value.hh"
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#include <sstream>
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#include <toml.hpp>
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namespace nix {
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void prim_fromTOML(EvalState & state, Value ** args, Value & val)
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{
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auto toml = state.forceStringNoCtx(
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*args[0], noPos, "while evaluating the argument passed to builtins.fromTOML"
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);
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std::istringstream tomlStream(std::string{toml});
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auto visit = [&](this const auto & self, Value & v, toml::value t) -> void {
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switch (t.type()) {
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case toml::value_t::table: {
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auto table = toml::get<toml::table>(t);
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auto attrs = state.ctx.buildBindings(table.size());
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for (auto & elem : table) {
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self(attrs.alloc(elem.first), elem.second);
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}
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v = {NewValueAs::attrs, attrs};
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} break;
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case toml::value_t::array: {
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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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auto list = state.ctx.mem.newList(size);
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v = {NewValueAs::list, list};
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for (size_t i = 0; i < size; ++i) {
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self(list->elems[i], 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 = {NewValueAs::boolean, toml::get<bool>(t)};
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break;
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case toml::value_t::integer:
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v = {NewValueAs::integer, toml::get<int64_t>(t)};
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break;
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case toml::value_t::floating:
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v = {NewValueAs::floating, toml::get<NixFloat>(t)};
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break;
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case toml::value_t::string:
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v = {NewValueAs::string, 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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// NOLINTNEXTLINE(lix-foreign-exceptions)
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throw std::runtime_error("Dates and times are not supported");
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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(
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val,
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toml::parse(
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tomlStream,
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"fromTOML", /* the "filename" */
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toml::spec::v(
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1, 0, 0
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) // Be explicit that we are parsing TOML 1.0.0 without extensions
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)
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);
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} catch (std::exception & e) { // NOLINT(lix-foreign-exceptions) // TODO: toml::syntax_error
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state.ctx.errors.make<EvalError>("while parsing TOML: %s", e.what()).debugThrow();
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}
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}
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}
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