forked from lix-project/lix
91 lines
2.6 KiB
C++
91 lines
2.6 KiB
C++
#include "primops.hh"
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#include "eval-inline.hh"
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#include "../../cpptoml/cpptoml.h"
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namespace nix {
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static void prim_fromTOML(EvalState & state, const Pos & pos, Value * * args, Value & v)
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{
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using namespace cpptoml;
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auto toml = state.forceStringNoCtx(*args[0], pos);
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std::istringstream tomlStream(toml);
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std::function<void(Value &, std::shared_ptr<base>)> visit;
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visit = [&](Value & v, std::shared_ptr<base> t) {
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if (auto t2 = t->as_table()) {
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size_t size = 0;
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for (auto & i : *t2) { (void) i; size++; }
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state.mkAttrs(v, size);
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for (auto & i : *t2) {
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auto & v2 = *state.allocAttr(v, state.symbols.create(i.first));
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if (auto i2 = i.second->as_table_array()) {
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size_t size2 = i2->get().size();
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state.mkList(v2, size2);
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for (size_t j = 0; j < size2; ++j)
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visit(*(v2.listElems()[j] = state.allocValue()), i2->get()[j]);
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}
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else
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visit(v2, i.second);
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}
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v.attrs->sort();
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}
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else if (auto t2 = t->as_array()) {
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size_t size = t2->get().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()), t2->get()[i]);
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}
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// Handle cases like 'a = [[{ a = true }]]', which IMHO should be
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// parsed as a array containing an array containing a table,
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// but instead are parsed as an array containing a table array
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// containing a table.
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else if (auto t2 = t->as_table_array()) {
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size_t size = t2->get().size();
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state.mkList(v, size);
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for (size_t j = 0; j < size; ++j)
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visit(*(v.listElems()[j] = state.allocValue()), t2->get()[j]);
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}
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else if (t->is_value()) {
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if (auto val = t->as<int64_t>())
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mkInt(v, val->get());
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else if (auto val = t->as<NixFloat>())
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mkFloat(v, val->get());
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else if (auto val = t->as<bool>())
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mkBool(v, val->get());
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else if (auto val = t->as<std::string>())
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mkString(v, val->get());
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else
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throw EvalError("unsupported value type in TOML");
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}
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else abort();
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};
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try {
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visit(v, parser(tomlStream).parse());
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} catch (std::runtime_error & e) {
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throw EvalError("while parsing a TOML string at %s: %s", pos, e.what());
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}
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}
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static RegisterPrimOp r("fromTOML", 1, prim_fromTOML);
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}
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