libexpr: move parser semantics into separate file
Another preparation for forking off and versioning the parser
Change-Id: I7b1225a44a3b81486414c1d37bd3e76a3ab307f9
This commit is contained in:
parent
f98ee07573
commit
e7d6212f77
851
src/libexpr/parser/parser-impl1.inc.cc
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851
src/libexpr/parser/parser-impl1.inc.cc
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@ -0,0 +1,851 @@
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// flip this define when doing parser development to enable some g checks.
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#if 0
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#include <tao/pegtl/contrib/analyze.hpp>
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#define ANALYZE_GRAMMAR \
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([] { \
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const std::size_t issues = tao::pegtl::analyze<grammar::v1::root>(); \
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assert(issues == 0); \
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})()
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#else
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#define ANALYZE_GRAMMAR ((void) 0)
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#endif
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namespace p = tao::pegtl;
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namespace nix::parser::v1 {
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namespace {
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template<typename>
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inline constexpr const char * error_message = nullptr;
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#define error_message_for(...) \
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template<> inline constexpr auto error_message<__VA_ARGS__>
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error_message_for(p::one<'{'>) = "expecting '{'";
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error_message_for(p::one<'}'>) = "expecting '}'";
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error_message_for(p::one<'"'>) = "expecting '\"'";
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error_message_for(p::one<';'>) = "expecting ';'";
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error_message_for(p::one<')'>) = "expecting ')'";
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error_message_for(p::one<']'>) = "expecting ']'";
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error_message_for(p::one<':'>) = "expecting ':'";
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error_message_for(p::string<'\'', '\''>) = "expecting \"''\"";
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error_message_for(p::any) = "expecting any character";
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error_message_for(grammar::v1::eof) = "expecting end of file";
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error_message_for(grammar::v1::seps) = "expecting separators";
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error_message_for(grammar::v1::path::forbid_prefix_triple_slash) = "too many slashes in path";
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error_message_for(grammar::v1::path::forbid_prefix_double_slash_no_interp) = "path has a trailing slash";
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error_message_for(grammar::v1::expr) = "expecting expression";
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error_message_for(grammar::v1::expr::unary) = "expecting expression";
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error_message_for(grammar::v1::binding::equal) = "expecting '='";
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error_message_for(grammar::v1::expr::lambda::arg) = "expecting identifier";
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error_message_for(grammar::v1::formals) = "expecting formals";
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error_message_for(grammar::v1::attrpath) = "expecting attribute path";
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error_message_for(grammar::v1::expr::select) = "expecting selection expression";
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error_message_for(grammar::v1::t::kw_then) = "expecting 'then'";
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error_message_for(grammar::v1::t::kw_else) = "expecting 'else'";
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error_message_for(grammar::v1::t::kw_in) = "expecting 'in'";
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struct SyntaxErrors
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{
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template<typename Rule>
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static constexpr auto message = error_message<Rule>;
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template<typename Rule>
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static constexpr bool raise_on_failure = false;
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};
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template<typename Rule>
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struct Control : p::must_if<SyntaxErrors>::control<Rule>
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{
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template<typename ParseInput, typename... States>
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[[noreturn]] static void raise(const ParseInput & in, States &&... st)
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{
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if (in.empty()) {
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std::string expected;
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if constexpr (constexpr auto msg = error_message<Rule>)
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expected = fmt(", %s", msg);
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throw p::parse_error("unexpected end of file" + expected, in);
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}
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p::must_if<SyntaxErrors>::control<Rule>::raise(in, st...);
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}
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};
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struct ExprState
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: grammar::v1::
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operator_semantics<ExprState, PosIdx, AttrPath, std::pair<PosIdx, std::unique_ptr<Expr>>>
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{
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std::unique_ptr<Expr> popExprOnly() {
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return std::move(popExpr().second);
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}
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template<typename Op, typename... Args>
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std::unique_ptr<Expr> applyUnary(Args &&... args) {
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return std::make_unique<Op>(popExprOnly(), std::forward<Args>(args)...);
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}
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template<typename Op>
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std::unique_ptr<Expr> applyBinary(PosIdx pos) {
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auto right = popExprOnly(), left = popExprOnly();
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return std::make_unique<Op>(pos, std::move(left), std::move(right));
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}
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std::unique_ptr<Expr> call(PosIdx pos, Symbol fn, bool flip = false)
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{
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std::vector<std::unique_ptr<Expr>> args(2);
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args[flip ? 0 : 1] = popExprOnly();
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args[flip ? 1 : 0] = popExprOnly();
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return std::make_unique<ExprCall>(pos, std::make_unique<ExprVar>(fn), std::move(args));
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}
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std::unique_ptr<Expr> pipe(PosIdx pos, State & state, bool flip = false)
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{
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if (!state.featureSettings.isEnabled(Xp::PipeOperator))
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throw ParseError({
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.msg = HintFmt("Pipe operator is disabled"),
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.pos = state.positions[pos]
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});
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// Reverse the order compared to normal function application: arg |> fn
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std::unique_ptr<Expr> fn, arg;
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if (flip) {
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fn = popExprOnly();
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arg = popExprOnly();
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} else {
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arg = popExprOnly();
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fn = popExprOnly();
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}
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std::vector<std::unique_ptr<Expr>> args{1};
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args[0] = std::move(arg);
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return std::make_unique<ExprCall>(pos, std::move(fn), std::move(args));
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}
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std::unique_ptr<Expr> order(PosIdx pos, bool less, State & state)
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{
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return call(pos, state.s.lessThan, !less);
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}
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std::unique_ptr<Expr> concatStrings(PosIdx pos)
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{
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std::vector<std::pair<PosIdx, std::unique_ptr<Expr>>> args(2);
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args[1] = popExpr();
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args[0] = popExpr();
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return std::make_unique<ExprConcatStrings>(pos, false, std::move(args));
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}
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std::unique_ptr<Expr> negate(PosIdx pos, State & state)
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{
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std::vector<std::unique_ptr<Expr>> args(2);
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args[0] = std::make_unique<ExprInt>(0);
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args[1] = popExprOnly();
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return std::make_unique<ExprCall>(pos, std::make_unique<ExprVar>(state.s.sub), std::move(args));
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}
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std::pair<PosIdx, std::unique_ptr<Expr>> applyOp(PosIdx pos, auto & op, State & state) {
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using Op = grammar::v1::op;
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auto not_ = [] (auto e) {
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return std::make_unique<ExprOpNot>(std::move(e));
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};
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return {
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pos,
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(overloaded {
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[&] (Op::implies) { return applyBinary<ExprOpImpl>(pos); },
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[&] (Op::or_) { return applyBinary<ExprOpOr>(pos); },
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[&] (Op::and_) { return applyBinary<ExprOpAnd>(pos); },
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[&] (Op::equals) { return applyBinary<ExprOpEq>(pos); },
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[&] (Op::not_equals) { return applyBinary<ExprOpNEq>(pos); },
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[&] (Op::less) { return order(pos, true, state); },
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[&] (Op::greater_eq) { return not_(order(pos, true, state)); },
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[&] (Op::greater) { return order(pos, false, state); },
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[&] (Op::less_eq) { return not_(order(pos, false, state)); },
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[&] (Op::update) { return applyBinary<ExprOpUpdate>(pos); },
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[&] (Op::not_) { return applyUnary<ExprOpNot>(); },
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[&] (Op::plus) { return concatStrings(pos); },
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[&] (Op::minus) { return call(pos, state.s.sub); },
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[&] (Op::mul) { return call(pos, state.s.mul); },
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[&] (Op::div) { return call(pos, state.s.div); },
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[&] (Op::concat) { return applyBinary<ExprOpConcatLists>(pos); },
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[&] (has_attr & a) { return applyUnary<ExprOpHasAttr>(std::move(a.path)); },
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[&] (Op::unary_minus) { return negate(pos, state); },
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[&] (Op::pipe_right) { return pipe(pos, state, true); },
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[&] (Op::pipe_left) { return pipe(pos, state); },
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})(op)
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};
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}
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// always_inline is needed, otherwise pushOp slows down considerably
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[[noreturn, gnu::always_inline]]
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static void badOperator(PosIdx pos, State & state)
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{
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throw ParseError({
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.msg = HintFmt("syntax error, unexpected operator"),
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.pos = state.positions[pos]
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});
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}
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template<typename Expr, typename... Args>
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Expr & pushExpr(PosIdx pos, Args && ... args)
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{
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auto p = std::make_unique<Expr>(std::forward<Args>(args)...);
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auto & result = *p;
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exprs.emplace_back(pos, std::move(p));
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return result;
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}
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};
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struct SubexprState {
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private:
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ExprState * up;
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public:
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explicit SubexprState(ExprState & up, auto &...) : up(&up) {}
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operator ExprState &() { return *up; }
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ExprState * operator->() { return up; }
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};
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template<typename Rule>
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struct BuildAST : grammar::v1::nothing<Rule> {};
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struct LambdaState : SubexprState {
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using SubexprState::SubexprState;
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Symbol arg;
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std::unique_ptr<Formals> formals;
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};
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struct FormalsState : SubexprState {
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using SubexprState::SubexprState;
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Formals formals{};
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Formal formal{};
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};
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template<> struct BuildAST<grammar::v1::formal::name> {
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static void apply(const auto & in, FormalsState & s, State & ps) {
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s.formal = {
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.pos = ps.at(in),
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.name = ps.symbols.create(in.string_view()),
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};
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}
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};
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template<> struct BuildAST<grammar::v1::formal> {
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static void apply0(FormalsState & s, State &) {
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s.formals.formals.emplace_back(std::move(s.formal));
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}
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};
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template<> struct BuildAST<grammar::v1::formal::default_value> {
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static void apply0(FormalsState & s, State & ps) {
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s.formal.def = s->popExprOnly();
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}
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};
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template<> struct BuildAST<grammar::v1::formals::ellipsis> {
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static void apply0(FormalsState & s, State &) {
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s.formals.ellipsis = true;
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}
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};
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template<> struct BuildAST<grammar::v1::formals> : change_head<FormalsState> {
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static void success0(FormalsState & f, LambdaState & s, State &) {
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s.formals = std::make_unique<Formals>(std::move(f.formals));
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}
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};
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struct AttrState : SubexprState {
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using SubexprState::SubexprState;
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std::vector<AttrName> attrs;
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template <typename T>
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void pushAttr(T && attr, PosIdx) { attrs.emplace_back(std::forward<T>(attr)); }
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};
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template<> struct BuildAST<grammar::v1::attr::simple> {
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static void apply(const auto & in, auto & s, State & ps) {
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s.pushAttr(ps.symbols.create(in.string_view()), ps.at(in));
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}
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};
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template<> struct BuildAST<grammar::v1::attr::string> {
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static void apply(const auto & in, auto & s, State & ps) {
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auto e = s->popExprOnly();
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if (auto str = dynamic_cast<ExprString *>(e.get()))
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s.pushAttr(ps.symbols.create(str->s), ps.at(in));
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else
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s.pushAttr(std::move(e), ps.at(in));
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}
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};
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template<> struct BuildAST<grammar::v1::attr::expr> : BuildAST<grammar::v1::attr::string> {};
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struct BindingsState : SubexprState {
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using SubexprState::SubexprState;
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ExprAttrs attrs;
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AttrPath path;
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std::unique_ptr<Expr> value;
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};
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struct InheritState : SubexprState {
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using SubexprState::SubexprState;
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std::vector<std::pair<AttrName, PosIdx>> attrs;
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std::unique_ptr<Expr> from;
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PosIdx fromPos;
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template <typename T>
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void pushAttr(T && attr, PosIdx pos) { attrs.emplace_back(std::forward<T>(attr), pos); }
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};
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template<> struct BuildAST<grammar::v1::inherit::from> {
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static void apply(const auto & in, InheritState & s, State & ps) {
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s.from = s->popExprOnly();
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s.fromPos = ps.at(in);
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}
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};
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template<> struct BuildAST<grammar::v1::inherit> : change_head<InheritState> {
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static void success0(InheritState & s, BindingsState & b, State & ps) {
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auto & attrs = b.attrs.attrs;
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// TODO this should not reuse generic attrpath rules.
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for (auto & [i, iPos] : s.attrs) {
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if (i.symbol)
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continue;
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if (auto str = dynamic_cast<ExprString *>(i.expr.get()))
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i = AttrName(ps.symbols.create(str->s));
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else {
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throw ParseError({
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.msg = HintFmt("dynamic attributes not allowed in inherit"),
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.pos = ps.positions[iPos]
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});
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}
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}
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if (s.from != nullptr) {
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if (!b.attrs.inheritFromExprs)
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b.attrs.inheritFromExprs = std::make_unique<std::vector<ref<Expr>>>();
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auto fromExpr = ref<Expr>(std::move(s.from));
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b.attrs.inheritFromExprs->push_back(fromExpr);
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for (auto & [i, iPos] : s.attrs) {
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if (attrs.find(i.symbol) != attrs.end())
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ps.dupAttr(i.symbol, iPos, attrs[i.symbol].pos);
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auto inheritFrom = std::make_unique<ExprInheritFrom>(
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s.fromPos,
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b.attrs.inheritFromExprs->size() - 1,
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fromExpr
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);
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attrs.emplace(
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i.symbol,
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ExprAttrs::AttrDef(
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std::make_unique<ExprSelect>(iPos, std::move(inheritFrom), i.symbol),
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iPos,
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ExprAttrs::AttrDef::Kind::InheritedFrom));
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}
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} else {
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for (auto & [i, iPos] : s.attrs) {
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if (attrs.find(i.symbol) != attrs.end())
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ps.dupAttr(i.symbol, iPos, attrs[i.symbol].pos);
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attrs.emplace(
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i.symbol,
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ExprAttrs::AttrDef(
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std::make_unique<ExprVar>(iPos, i.symbol),
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iPos,
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ExprAttrs::AttrDef::Kind::Inherited));
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}
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}
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}
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};
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template<> struct BuildAST<grammar::v1::binding::path> : change_head<AttrState> {
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static void success0(AttrState & a, BindingsState & s, State & ps) {
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s.path = std::move(a.attrs);
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}
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};
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template<> struct BuildAST<grammar::v1::binding::value> {
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static void apply0(BindingsState & s, State & ps) {
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s.value = s->popExprOnly();
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}
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};
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template<> struct BuildAST<grammar::v1::binding> {
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static void apply(const auto & in, BindingsState & s, State & ps) {
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ps.addAttr(&s.attrs, std::move(s.path), std::move(s.value), ps.at(in));
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}
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};
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template<> struct BuildAST<grammar::v1::expr::id> {
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static void apply(const auto & in, ExprState & s, State & ps) {
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if (in.string_view() == "__curPos")
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s.pushExpr<ExprPos>(ps.at(in), ps.at(in));
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else
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s.pushExpr<ExprVar>(ps.at(in), ps.at(in), ps.symbols.create(in.string_view()));
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}
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};
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template<> struct BuildAST<grammar::v1::expr::int_> {
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static void apply(const auto & in, ExprState & s, State & ps) {
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int64_t v;
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if (std::from_chars(in.begin(), in.end(), v).ec != std::errc{}) {
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throw ParseError({
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.msg = HintFmt("invalid integer '%1%'", in.string_view()),
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.pos = ps.positions[ps.at(in)],
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});
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}
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s.pushExpr<ExprInt>(noPos, v);
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}
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};
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template<> struct BuildAST<grammar::v1::expr::float_> {
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static void apply(const auto & in, ExprState & s, State & ps) {
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// copy the input into a temporary string so we can call stod.
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// can't use from_chars because libc++ (thus darwin) does not have it,
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// and floats are not performance-sensitive anyway. if they were you'd
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// be in much bigger trouble than this.
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//
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// we also get to do a locale-save dance because stod is locale-aware and
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// something (a plugin?) may have called setlocale or uselocale.
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static struct locale_hack {
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locale_t posix;
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locale_hack(): posix(newlocale(LC_ALL_MASK, "POSIX", 0))
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{
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if (posix == 0)
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throw SysError("could not get POSIX locale");
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}
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} locale;
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auto tmp = in.string();
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double v = [&] {
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auto oldLocale = uselocale(locale.posix);
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Finally resetLocale([=] { uselocale(oldLocale); });
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try {
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return std::stod(tmp);
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} catch (...) {
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throw ParseError({
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.msg = HintFmt("invalid float '%1%'", in.string_view()),
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.pos = ps.positions[ps.at(in)],
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});
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}
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||||
}();
|
||||
s.pushExpr<ExprFloat>(noPos, v);
|
||||
}
|
||||
};
|
||||
|
||||
struct StringState : SubexprState {
|
||||
using SubexprState::SubexprState;
|
||||
|
||||
std::string currentLiteral;
|
||||
PosIdx currentPos;
|
||||
std::vector<std::pair<nix::PosIdx, std::unique_ptr<Expr>>> parts;
|
||||
|
||||
void append(PosIdx pos, std::string_view s)
|
||||
{
|
||||
if (currentLiteral.empty())
|
||||
currentPos = pos;
|
||||
currentLiteral += s;
|
||||
}
|
||||
|
||||
// FIXME this truncates strings on NUL for compat with the old parser. ideally
|
||||
// we should use the decomposition the g gives us instead of iterating over
|
||||
// the entire string again.
|
||||
static void unescapeStr(std::string & str)
|
||||
{
|
||||
char * s = str.data();
|
||||
char * t = s;
|
||||
char c;
|
||||
while ((c = *s++)) {
|
||||
if (c == '\\') {
|
||||
c = *s++;
|
||||
if (c == 'n') *t = '\n';
|
||||
else if (c == 'r') *t = '\r';
|
||||
else if (c == 't') *t = '\t';
|
||||
else *t = c;
|
||||
}
|
||||
else if (c == '\r') {
|
||||
/* Normalise CR and CR/LF into LF. */
|
||||
*t = '\n';
|
||||
if (*s == '\n') s++; /* cr/lf */
|
||||
}
|
||||
else *t = c;
|
||||
t++;
|
||||
}
|
||||
str.resize(t - str.data());
|
||||
}
|
||||
|
||||
void endLiteral()
|
||||
{
|
||||
if (!currentLiteral.empty()) {
|
||||
unescapeStr(currentLiteral);
|
||||
parts.emplace_back(currentPos, std::make_unique<ExprString>(std::move(currentLiteral)));
|
||||
}
|
||||
}
|
||||
|
||||
std::unique_ptr<Expr> finish()
|
||||
{
|
||||
if (parts.empty()) {
|
||||
unescapeStr(currentLiteral);
|
||||
return std::make_unique<ExprString>(std::move(currentLiteral));
|
||||
} else {
|
||||
endLiteral();
|
||||
auto pos = parts[0].first;
|
||||
return std::make_unique<ExprConcatStrings>(pos, true, std::move(parts));
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
template<typename... Content> struct BuildAST<grammar::v1::string::literal<Content...>> {
|
||||
static void apply(const auto & in, StringState & s, State & ps) {
|
||||
s.append(ps.at(in), in.string_view());
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::string::cr_lf> {
|
||||
static void apply(const auto & in, StringState & s, State & ps) {
|
||||
s.append(ps.at(in), in.string_view()); // FIXME compat with old parser
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::string::interpolation> {
|
||||
static void apply(const auto & in, StringState & s, State & ps) {
|
||||
s.endLiteral();
|
||||
s.parts.emplace_back(ps.at(in), s->popExprOnly());
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::string::escape> {
|
||||
static void apply(const auto & in, StringState & s, State & ps) {
|
||||
s.append(ps.at(in), "\\"); // FIXME compat with old parser
|
||||
s.append(ps.at(in), in.string_view());
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::string> : change_head<StringState> {
|
||||
static void success0(StringState & s, ExprState & e, State &) {
|
||||
e.exprs.emplace_back(noPos, s.finish());
|
||||
}
|
||||
};
|
||||
|
||||
struct IndStringState : SubexprState {
|
||||
using SubexprState::SubexprState;
|
||||
|
||||
std::vector<std::pair<PosIdx, std::variant<std::unique_ptr<Expr>, StringToken>>> parts;
|
||||
};
|
||||
|
||||
template<bool Indented, typename... Content>
|
||||
struct BuildAST<grammar::v1::ind_string::literal<Indented, Content...>> {
|
||||
static void apply(const auto & in, IndStringState & s, State & ps) {
|
||||
s.parts.emplace_back(ps.at(in), StringToken{in.string_view(), Indented});
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::ind_string::interpolation> {
|
||||
static void apply(const auto & in, IndStringState & s, State & ps) {
|
||||
s.parts.emplace_back(ps.at(in), s->popExprOnly());
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::ind_string::escape> {
|
||||
static void apply(const auto & in, IndStringState & s, State & ps) {
|
||||
switch (*in.begin()) {
|
||||
case 'n': s.parts.emplace_back(ps.at(in), StringToken{"\n"}); break;
|
||||
case 'r': s.parts.emplace_back(ps.at(in), StringToken{"\r"}); break;
|
||||
case 't': s.parts.emplace_back(ps.at(in), StringToken{"\t"}); break;
|
||||
default: s.parts.emplace_back(ps.at(in), StringToken{in.string_view()}); break;
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::ind_string> : change_head<IndStringState> {
|
||||
static void success(const auto & in, IndStringState & s, ExprState & e, State & ps) {
|
||||
e.exprs.emplace_back(noPos, ps.stripIndentation(ps.at(in), std::move(s.parts)));
|
||||
}
|
||||
};
|
||||
|
||||
template<typename... Content> struct BuildAST<grammar::v1::path::literal<Content...>> {
|
||||
static void apply(const auto & in, StringState & s, State & ps) {
|
||||
s.append(ps.at(in), in.string_view());
|
||||
s.endLiteral();
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::path::interpolation> : BuildAST<grammar::v1::string::interpolation> {};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::path::anchor> {
|
||||
static void apply(const auto & in, StringState & s, State & ps) {
|
||||
Path path(absPath(in.string(), ps.basePath.path.abs()));
|
||||
/* add back in the trailing '/' to the first segment */
|
||||
if (in.string_view().ends_with('/') && in.size() > 1)
|
||||
path += "/";
|
||||
s.parts.emplace_back(ps.at(in), new ExprPath(std::move(path)));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::path::home_anchor> {
|
||||
static void apply(const auto & in, StringState & s, State & ps) {
|
||||
if (evalSettings.pureEval)
|
||||
throw Error("the path '%s' can not be resolved in pure mode", in.string_view());
|
||||
Path path(getHome() + in.string_view().substr(1));
|
||||
s.parts.emplace_back(ps.at(in), new ExprPath(std::move(path)));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::path::searched_path> {
|
||||
static void apply(const auto & in, StringState & s, State & ps) {
|
||||
std::vector<std::unique_ptr<Expr>> args{2};
|
||||
args[0] = std::make_unique<ExprVar>(ps.s.nixPath);
|
||||
args[1] = std::make_unique<ExprString>(in.string());
|
||||
s.parts.emplace_back(
|
||||
ps.at(in),
|
||||
std::make_unique<ExprCall>(
|
||||
ps.at(in),
|
||||
std::make_unique<ExprVar>(ps.s.findFile),
|
||||
std::move(args)));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::path> : change_head<StringState> {
|
||||
template<typename E>
|
||||
static void check_slash(PosIdx end, StringState & s, State & ps) {
|
||||
auto e = dynamic_cast<E *>(s.parts.back().second.get());
|
||||
if (!e || !e->s.ends_with('/'))
|
||||
return;
|
||||
if (s.parts.size() > 1 || e->s != "/")
|
||||
throw ParseError({
|
||||
.msg = HintFmt("path has a trailing slash"),
|
||||
.pos = ps.positions[end],
|
||||
});
|
||||
}
|
||||
|
||||
static void success(const auto & in, StringState & s, ExprState & e, State & ps) {
|
||||
s.endLiteral();
|
||||
check_slash<ExprPath>(ps.atEnd(in), s, ps);
|
||||
check_slash<ExprString>(ps.atEnd(in), s, ps);
|
||||
if (s.parts.size() == 1) {
|
||||
e.exprs.emplace_back(noPos, std::move(s.parts.back().second));
|
||||
} else {
|
||||
e.pushExpr<ExprConcatStrings>(ps.at(in), ps.at(in), false, std::move(s.parts));
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
// strings and paths sare handled fully by the grammar-level rule for now
|
||||
template<> struct BuildAST<grammar::v1::expr::string> : p::maybe_nothing {};
|
||||
template<> struct BuildAST<grammar::v1::expr::ind_string> : p::maybe_nothing {};
|
||||
template<> struct BuildAST<grammar::v1::expr::path> : p::maybe_nothing {};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::uri> {
|
||||
static void apply(const auto & in, ExprState & s, State & ps) {
|
||||
bool URLLiterals = ps.featureSettings.isEnabled(Dep::UrlLiterals);
|
||||
if (!URLLiterals)
|
||||
throw ParseError({
|
||||
.msg = HintFmt("URL literals are deprecated, allow using them with --extra-deprecated-features=url-literals"),
|
||||
.pos = ps.positions[ps.at(in)]
|
||||
});
|
||||
s.pushExpr<ExprString>(ps.at(in), in.string());
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::ancient_let> : change_head<BindingsState> {
|
||||
static void success(const auto & in, BindingsState & b, ExprState & s, State & ps) {
|
||||
// Added 2024-09-18. Turn into an error at some point in the future.
|
||||
// See the documentation on deprecated features for more details.
|
||||
if (!ps.featureSettings.isEnabled(Dep::AncientLet))
|
||||
warn(
|
||||
"%s found at %s. This feature is deprecated and will be removed in the future. Use %s to silence this warning.",
|
||||
"let {",
|
||||
ps.positions[ps.at(in)],
|
||||
"--extra-deprecated-features ancient-let"
|
||||
);
|
||||
|
||||
b.attrs.pos = ps.at(in);
|
||||
b.attrs.recursive = true;
|
||||
s.pushExpr<ExprSelect>(b.attrs.pos, b.attrs.pos, std::make_unique<ExprAttrs>(std::move(b.attrs)), ps.s.body);
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::rec_set> : change_head<BindingsState> {
|
||||
static void success(const auto & in, BindingsState & b, ExprState & s, State & ps) {
|
||||
// Before inserting new attrs, check for __override and throw an error
|
||||
// (the error will initially be a warning to ease migration)
|
||||
if (!featureSettings.isEnabled(Dep::RecSetOverrides) && b.attrs.attrs.contains(ps.s.overrides)) {
|
||||
ps.overridesFound(ps.at(in));
|
||||
}
|
||||
|
||||
b.attrs.pos = ps.at(in);
|
||||
b.attrs.recursive = true;
|
||||
s.pushExpr<ExprAttrs>(b.attrs.pos, std::move(b.attrs));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::set> : change_head<BindingsState> {
|
||||
static void success(const auto & in, BindingsState & b, ExprState & s, State & ps) {
|
||||
b.attrs.pos = ps.at(in);
|
||||
s.pushExpr<ExprAttrs>(b.attrs.pos, std::move(b.attrs));
|
||||
}
|
||||
};
|
||||
|
||||
using ListState = std::vector<std::unique_ptr<Expr>>;
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::list> : change_head<ListState> {
|
||||
static void success(const auto & in, ListState & ls, ExprState & s, State & ps) {
|
||||
auto e = std::make_unique<ExprList>();
|
||||
e->elems = std::move(ls);
|
||||
s.exprs.emplace_back(ps.at(in), std::move(e));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::list::entry> : change_head<ExprState> {
|
||||
static void success0(ExprState & e, ListState & s, State & ps) {
|
||||
s.emplace_back(e.finish(ps).second);
|
||||
}
|
||||
};
|
||||
|
||||
struct SelectState : SubexprState {
|
||||
using SubexprState::SubexprState;
|
||||
|
||||
PosIdx pos;
|
||||
ExprSelect * e = nullptr;
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::select::head> {
|
||||
static void apply(const auto & in, SelectState & s, State & ps) {
|
||||
s.pos = ps.at(in);
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::select::attr> : change_head<AttrState> {
|
||||
static void success0(AttrState & a, SelectState & s, State &) {
|
||||
s.e = &s->pushExpr<ExprSelect>(s.pos, s.pos, s->popExprOnly(), std::move(a.attrs), nullptr);
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::select::attr_or> {
|
||||
static void apply0(SelectState & s, State &) {
|
||||
s.e->def = s->popExprOnly();
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::select::as_app_or> {
|
||||
static void apply(const auto & in, SelectState & s, State & ps) {
|
||||
std::vector<std::unique_ptr<Expr>> args(1);
|
||||
args[0] = std::make_unique<ExprVar>(ps.at(in), ps.s.or_);
|
||||
s->pushExpr<ExprCall>(s.pos, s.pos, s->popExprOnly(), std::move(args));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::select> : change_head<SelectState> {
|
||||
static void success0(const auto &...) {}
|
||||
};
|
||||
|
||||
struct AppState : SubexprState {
|
||||
using SubexprState::SubexprState;
|
||||
|
||||
PosIdx pos;
|
||||
ExprCall * e = nullptr;
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::app::select_or_fn> {
|
||||
static void apply(const auto & in, AppState & s, State & ps) {
|
||||
s.pos = ps.at(in);
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::app::first_arg> {
|
||||
static void apply(auto & in, AppState & s, State & ps) {
|
||||
auto arg = s->popExprOnly(), fn = s->popExprOnly();
|
||||
if ((s.e = dynamic_cast<ExprCall *>(fn.get()))) {
|
||||
// TODO remove.
|
||||
// AST compat with old parser, semantics are the same.
|
||||
// this can happen on occasions such as `<p> <p>` or `a or b or`,
|
||||
// neither of which are super worth optimizing.
|
||||
s.e->args.push_back(std::move(arg));
|
||||
s->exprs.emplace_back(noPos, std::move(fn));
|
||||
} else {
|
||||
std::vector<std::unique_ptr<Expr>> args{1};
|
||||
args[0] = std::move(arg);
|
||||
s.e = &s->pushExpr<ExprCall>(s.pos, s.pos, std::move(fn), std::move(args));
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::app::another_arg> {
|
||||
static void apply0(AppState & s, State & ps) {
|
||||
s.e->args.push_back(s->popExprOnly());
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::app> : change_head<AppState> {
|
||||
static void success0(const auto &...) {}
|
||||
};
|
||||
|
||||
template<typename Op> struct BuildAST<grammar::v1::expr::operator_<Op>> {
|
||||
static void apply(const auto & in, ExprState & s, State & ps) {
|
||||
s.pushOp(ps.at(in), Op{}, ps);
|
||||
}
|
||||
};
|
||||
template<> struct BuildAST<grammar::v1::expr::operator_<grammar::v1::op::has_attr>> : change_head<AttrState> {
|
||||
static void success(const auto & in, AttrState & a, ExprState & s, State & ps) {
|
||||
s.pushOp(ps.at(in), ExprState::has_attr{{}, std::move(a.attrs)}, ps);
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::lambda::arg> {
|
||||
static void apply(const auto & in, LambdaState & s, State & ps) {
|
||||
s.arg = ps.symbols.create(in.string_view());
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::lambda> : change_head<LambdaState> {
|
||||
static void success(const auto & in, LambdaState & l, ExprState & s, State & ps) {
|
||||
if (l.formals)
|
||||
l.formals = ps.validateFormals(std::move(l.formals), ps.at(in), l.arg);
|
||||
s.pushExpr<ExprLambda>(ps.at(in), ps.at(in), l.arg, std::move(l.formals), l->popExprOnly());
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::assert_> {
|
||||
static void apply(const auto & in, ExprState & s, State & ps) {
|
||||
auto body = s.popExprOnly(), cond = s.popExprOnly();
|
||||
s.pushExpr<ExprAssert>(ps.at(in), ps.at(in), std::move(cond), std::move(body));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::with> {
|
||||
static void apply(const auto & in, ExprState & s, State & ps) {
|
||||
auto body = s.popExprOnly(), scope = s.popExprOnly();
|
||||
s.pushExpr<ExprWith>(ps.at(in), ps.at(in), std::move(scope), std::move(body));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::let> : change_head<BindingsState> {
|
||||
static void success(const auto & in, BindingsState & b, ExprState & s, State & ps) {
|
||||
if (!b.attrs.dynamicAttrs.empty())
|
||||
throw ParseError({
|
||||
.msg = HintFmt("dynamic attributes not allowed in let"),
|
||||
.pos = ps.positions[ps.at(in)]
|
||||
});
|
||||
|
||||
s.pushExpr<ExprLet>(ps.at(in), std::make_unique<ExprAttrs>(std::move(b.attrs)), b->popExprOnly());
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::if_> {
|
||||
static void apply(const auto & in, ExprState & s, State & ps) {
|
||||
auto else_ = s.popExprOnly(), then = s.popExprOnly(), cond = s.popExprOnly();
|
||||
s.pushExpr<ExprIf>(ps.at(in), ps.at(in), std::move(cond), std::move(then), std::move(else_));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr> : change_head<ExprState> {
|
||||
static void success0(ExprState & inner, ExprState & outer, State & ps) {
|
||||
outer.exprs.push_back(inner.finish(ps));
|
||||
}
|
||||
};
|
||||
|
||||
}
|
||||
}
|
||||
|
|
@ -14,857 +14,11 @@
|
|||
#include <charconv>
|
||||
#include <memory>
|
||||
|
||||
// flip this define when doing parser development to enable some g checks.
|
||||
#if 0
|
||||
#include <tao/pegtl/contrib/analyze.hpp>
|
||||
#define ANALYZE_GRAMMAR \
|
||||
([] { \
|
||||
const std::size_t issues = tao::pegtl::analyze<grammar::v1::root>(); \
|
||||
assert(issues == 0); \
|
||||
})()
|
||||
#else
|
||||
#define ANALYZE_GRAMMAR ((void) 0)
|
||||
#endif
|
||||
|
||||
namespace p = tao::pegtl;
|
||||
|
||||
namespace nix::parser {
|
||||
namespace {
|
||||
|
||||
template<typename>
|
||||
inline constexpr const char * error_message = nullptr;
|
||||
|
||||
#define error_message_for(...) \
|
||||
template<> inline constexpr auto error_message<__VA_ARGS__>
|
||||
|
||||
error_message_for(p::one<'{'>) = "expecting '{'";
|
||||
error_message_for(p::one<'}'>) = "expecting '}'";
|
||||
error_message_for(p::one<'"'>) = "expecting '\"'";
|
||||
error_message_for(p::one<';'>) = "expecting ';'";
|
||||
error_message_for(p::one<')'>) = "expecting ')'";
|
||||
error_message_for(p::one<']'>) = "expecting ']'";
|
||||
error_message_for(p::one<':'>) = "expecting ':'";
|
||||
error_message_for(p::string<'\'', '\''>) = "expecting \"''\"";
|
||||
error_message_for(p::any) = "expecting any character";
|
||||
error_message_for(grammar::v1::eof) = "expecting end of file";
|
||||
error_message_for(grammar::v1::seps) = "expecting separators";
|
||||
error_message_for(grammar::v1::path::forbid_prefix_triple_slash) = "too many slashes in path";
|
||||
error_message_for(grammar::v1::path::forbid_prefix_double_slash_no_interp) = "path has a trailing slash";
|
||||
error_message_for(grammar::v1::expr) = "expecting expression";
|
||||
error_message_for(grammar::v1::expr::unary) = "expecting expression";
|
||||
error_message_for(grammar::v1::binding::equal) = "expecting '='";
|
||||
error_message_for(grammar::v1::expr::lambda::arg) = "expecting identifier";
|
||||
error_message_for(grammar::v1::formals) = "expecting formals";
|
||||
error_message_for(grammar::v1::attrpath) = "expecting attribute path";
|
||||
error_message_for(grammar::v1::expr::select) = "expecting selection expression";
|
||||
error_message_for(grammar::v1::t::kw_then) = "expecting 'then'";
|
||||
error_message_for(grammar::v1::t::kw_else) = "expecting 'else'";
|
||||
error_message_for(grammar::v1::t::kw_in) = "expecting 'in'";
|
||||
|
||||
struct SyntaxErrors
|
||||
{
|
||||
template<typename Rule>
|
||||
static constexpr auto message = error_message<Rule>;
|
||||
|
||||
template<typename Rule>
|
||||
static constexpr bool raise_on_failure = false;
|
||||
};
|
||||
|
||||
template<typename Rule>
|
||||
struct Control : p::must_if<SyntaxErrors>::control<Rule>
|
||||
{
|
||||
template<typename ParseInput, typename... States>
|
||||
[[noreturn]] static void raise(const ParseInput & in, States &&... st)
|
||||
{
|
||||
if (in.empty()) {
|
||||
std::string expected;
|
||||
if constexpr (constexpr auto msg = error_message<Rule>)
|
||||
expected = fmt(", %s", msg);
|
||||
throw p::parse_error("unexpected end of file" + expected, in);
|
||||
}
|
||||
p::must_if<SyntaxErrors>::control<Rule>::raise(in, st...);
|
||||
}
|
||||
};
|
||||
|
||||
struct ExprState
|
||||
: grammar::v1::
|
||||
operator_semantics<ExprState, PosIdx, AttrPath, std::pair<PosIdx, std::unique_ptr<Expr>>>
|
||||
{
|
||||
std::unique_ptr<Expr> popExprOnly() {
|
||||
return std::move(popExpr().second);
|
||||
}
|
||||
|
||||
template<typename Op, typename... Args>
|
||||
std::unique_ptr<Expr> applyUnary(Args &&... args) {
|
||||
return std::make_unique<Op>(popExprOnly(), std::forward<Args>(args)...);
|
||||
}
|
||||
|
||||
template<typename Op>
|
||||
std::unique_ptr<Expr> applyBinary(PosIdx pos) {
|
||||
auto right = popExprOnly(), left = popExprOnly();
|
||||
return std::make_unique<Op>(pos, std::move(left), std::move(right));
|
||||
}
|
||||
|
||||
std::unique_ptr<Expr> call(PosIdx pos, Symbol fn, bool flip = false)
|
||||
{
|
||||
std::vector<std::unique_ptr<Expr>> args(2);
|
||||
args[flip ? 0 : 1] = popExprOnly();
|
||||
args[flip ? 1 : 0] = popExprOnly();
|
||||
return std::make_unique<ExprCall>(pos, std::make_unique<ExprVar>(fn), std::move(args));
|
||||
}
|
||||
|
||||
std::unique_ptr<Expr> pipe(PosIdx pos, State & state, bool flip = false)
|
||||
{
|
||||
if (!state.featureSettings.isEnabled(Xp::PipeOperator))
|
||||
throw ParseError({
|
||||
.msg = HintFmt("Pipe operator is disabled"),
|
||||
.pos = state.positions[pos]
|
||||
});
|
||||
|
||||
// Reverse the order compared to normal function application: arg |> fn
|
||||
std::unique_ptr<Expr> fn, arg;
|
||||
if (flip) {
|
||||
fn = popExprOnly();
|
||||
arg = popExprOnly();
|
||||
} else {
|
||||
arg = popExprOnly();
|
||||
fn = popExprOnly();
|
||||
}
|
||||
std::vector<std::unique_ptr<Expr>> args{1};
|
||||
args[0] = std::move(arg);
|
||||
|
||||
return std::make_unique<ExprCall>(pos, std::move(fn), std::move(args));
|
||||
}
|
||||
|
||||
std::unique_ptr<Expr> order(PosIdx pos, bool less, State & state)
|
||||
{
|
||||
return call(pos, state.s.lessThan, !less);
|
||||
}
|
||||
|
||||
std::unique_ptr<Expr> concatStrings(PosIdx pos)
|
||||
{
|
||||
std::vector<std::pair<PosIdx, std::unique_ptr<Expr>>> args(2);
|
||||
args[1] = popExpr();
|
||||
args[0] = popExpr();
|
||||
return std::make_unique<ExprConcatStrings>(pos, false, std::move(args));
|
||||
}
|
||||
|
||||
std::unique_ptr<Expr> negate(PosIdx pos, State & state)
|
||||
{
|
||||
std::vector<std::unique_ptr<Expr>> args(2);
|
||||
args[0] = std::make_unique<ExprInt>(0);
|
||||
args[1] = popExprOnly();
|
||||
return std::make_unique<ExprCall>(pos, std::make_unique<ExprVar>(state.s.sub), std::move(args));
|
||||
}
|
||||
|
||||
std::pair<PosIdx, std::unique_ptr<Expr>> applyOp(PosIdx pos, auto & op, State & state) {
|
||||
using Op = grammar::v1::op;
|
||||
|
||||
auto not_ = [] (auto e) {
|
||||
return std::make_unique<ExprOpNot>(std::move(e));
|
||||
};
|
||||
|
||||
return {
|
||||
pos,
|
||||
(overloaded {
|
||||
[&] (Op::implies) { return applyBinary<ExprOpImpl>(pos); },
|
||||
[&] (Op::or_) { return applyBinary<ExprOpOr>(pos); },
|
||||
[&] (Op::and_) { return applyBinary<ExprOpAnd>(pos); },
|
||||
[&] (Op::equals) { return applyBinary<ExprOpEq>(pos); },
|
||||
[&] (Op::not_equals) { return applyBinary<ExprOpNEq>(pos); },
|
||||
[&] (Op::less) { return order(pos, true, state); },
|
||||
[&] (Op::greater_eq) { return not_(order(pos, true, state)); },
|
||||
[&] (Op::greater) { return order(pos, false, state); },
|
||||
[&] (Op::less_eq) { return not_(order(pos, false, state)); },
|
||||
[&] (Op::update) { return applyBinary<ExprOpUpdate>(pos); },
|
||||
[&] (Op::not_) { return applyUnary<ExprOpNot>(); },
|
||||
[&] (Op::plus) { return concatStrings(pos); },
|
||||
[&] (Op::minus) { return call(pos, state.s.sub); },
|
||||
[&] (Op::mul) { return call(pos, state.s.mul); },
|
||||
[&] (Op::div) { return call(pos, state.s.div); },
|
||||
[&] (Op::concat) { return applyBinary<ExprOpConcatLists>(pos); },
|
||||
[&] (has_attr & a) { return applyUnary<ExprOpHasAttr>(std::move(a.path)); },
|
||||
[&] (Op::unary_minus) { return negate(pos, state); },
|
||||
[&] (Op::pipe_right) { return pipe(pos, state, true); },
|
||||
[&] (Op::pipe_left) { return pipe(pos, state); },
|
||||
})(op)
|
||||
};
|
||||
}
|
||||
|
||||
// always_inline is needed, otherwise pushOp slows down considerably
|
||||
[[noreturn, gnu::always_inline]]
|
||||
static void badOperator(PosIdx pos, State & state)
|
||||
{
|
||||
throw ParseError({
|
||||
.msg = HintFmt("syntax error, unexpected operator"),
|
||||
.pos = state.positions[pos]
|
||||
});
|
||||
}
|
||||
|
||||
template<typename Expr, typename... Args>
|
||||
Expr & pushExpr(PosIdx pos, Args && ... args)
|
||||
{
|
||||
auto p = std::make_unique<Expr>(std::forward<Args>(args)...);
|
||||
auto & result = *p;
|
||||
exprs.emplace_back(pos, std::move(p));
|
||||
return result;
|
||||
}
|
||||
};
|
||||
|
||||
struct SubexprState {
|
||||
private:
|
||||
ExprState * up;
|
||||
|
||||
public:
|
||||
explicit SubexprState(ExprState & up, auto &...) : up(&up) {}
|
||||
operator ExprState &() { return *up; }
|
||||
ExprState * operator->() { return up; }
|
||||
};
|
||||
|
||||
|
||||
|
||||
template<typename Rule>
|
||||
struct BuildAST : grammar::v1::nothing<Rule> {};
|
||||
|
||||
struct LambdaState : SubexprState {
|
||||
using SubexprState::SubexprState;
|
||||
|
||||
Symbol arg;
|
||||
std::unique_ptr<Formals> formals;
|
||||
};
|
||||
|
||||
struct FormalsState : SubexprState {
|
||||
using SubexprState::SubexprState;
|
||||
|
||||
Formals formals{};
|
||||
Formal formal{};
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::formal::name> {
|
||||
static void apply(const auto & in, FormalsState & s, State & ps) {
|
||||
s.formal = {
|
||||
.pos = ps.at(in),
|
||||
.name = ps.symbols.create(in.string_view()),
|
||||
};
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::formal> {
|
||||
static void apply0(FormalsState & s, State &) {
|
||||
s.formals.formals.emplace_back(std::move(s.formal));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::formal::default_value> {
|
||||
static void apply0(FormalsState & s, State & ps) {
|
||||
s.formal.def = s->popExprOnly();
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::formals::ellipsis> {
|
||||
static void apply0(FormalsState & s, State &) {
|
||||
s.formals.ellipsis = true;
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::formals> : change_head<FormalsState> {
|
||||
static void success0(FormalsState & f, LambdaState & s, State &) {
|
||||
s.formals = std::make_unique<Formals>(std::move(f.formals));
|
||||
}
|
||||
};
|
||||
|
||||
struct AttrState : SubexprState {
|
||||
using SubexprState::SubexprState;
|
||||
|
||||
std::vector<AttrName> attrs;
|
||||
|
||||
template <typename T>
|
||||
void pushAttr(T && attr, PosIdx) { attrs.emplace_back(std::forward<T>(attr)); }
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::attr::simple> {
|
||||
static void apply(const auto & in, auto & s, State & ps) {
|
||||
s.pushAttr(ps.symbols.create(in.string_view()), ps.at(in));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::attr::string> {
|
||||
static void apply(const auto & in, auto & s, State & ps) {
|
||||
auto e = s->popExprOnly();
|
||||
if (auto str = dynamic_cast<ExprString *>(e.get()))
|
||||
s.pushAttr(ps.symbols.create(str->s), ps.at(in));
|
||||
else
|
||||
s.pushAttr(std::move(e), ps.at(in));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::attr::expr> : BuildAST<grammar::v1::attr::string> {};
|
||||
|
||||
struct BindingsState : SubexprState {
|
||||
using SubexprState::SubexprState;
|
||||
|
||||
ExprAttrs attrs;
|
||||
AttrPath path;
|
||||
std::unique_ptr<Expr> value;
|
||||
};
|
||||
|
||||
struct InheritState : SubexprState {
|
||||
using SubexprState::SubexprState;
|
||||
|
||||
std::vector<std::pair<AttrName, PosIdx>> attrs;
|
||||
std::unique_ptr<Expr> from;
|
||||
PosIdx fromPos;
|
||||
|
||||
template <typename T>
|
||||
void pushAttr(T && attr, PosIdx pos) { attrs.emplace_back(std::forward<T>(attr), pos); }
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::inherit::from> {
|
||||
static void apply(const auto & in, InheritState & s, State & ps) {
|
||||
s.from = s->popExprOnly();
|
||||
s.fromPos = ps.at(in);
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::inherit> : change_head<InheritState> {
|
||||
static void success0(InheritState & s, BindingsState & b, State & ps) {
|
||||
auto & attrs = b.attrs.attrs;
|
||||
// TODO this should not reuse generic attrpath rules.
|
||||
for (auto & [i, iPos] : s.attrs) {
|
||||
if (i.symbol)
|
||||
continue;
|
||||
if (auto str = dynamic_cast<ExprString *>(i.expr.get()))
|
||||
i = AttrName(ps.symbols.create(str->s));
|
||||
else {
|
||||
throw ParseError({
|
||||
.msg = HintFmt("dynamic attributes not allowed in inherit"),
|
||||
.pos = ps.positions[iPos]
|
||||
});
|
||||
}
|
||||
}
|
||||
if (s.from != nullptr) {
|
||||
if (!b.attrs.inheritFromExprs)
|
||||
b.attrs.inheritFromExprs = std::make_unique<std::vector<ref<Expr>>>();
|
||||
auto fromExpr = ref<Expr>(std::move(s.from));
|
||||
b.attrs.inheritFromExprs->push_back(fromExpr);
|
||||
for (auto & [i, iPos] : s.attrs) {
|
||||
if (attrs.find(i.symbol) != attrs.end())
|
||||
ps.dupAttr(i.symbol, iPos, attrs[i.symbol].pos);
|
||||
auto inheritFrom = std::make_unique<ExprInheritFrom>(
|
||||
s.fromPos,
|
||||
b.attrs.inheritFromExprs->size() - 1,
|
||||
fromExpr
|
||||
);
|
||||
attrs.emplace(
|
||||
i.symbol,
|
||||
ExprAttrs::AttrDef(
|
||||
std::make_unique<ExprSelect>(iPos, std::move(inheritFrom), i.symbol),
|
||||
iPos,
|
||||
ExprAttrs::AttrDef::Kind::InheritedFrom));
|
||||
}
|
||||
} else {
|
||||
for (auto & [i, iPos] : s.attrs) {
|
||||
if (attrs.find(i.symbol) != attrs.end())
|
||||
ps.dupAttr(i.symbol, iPos, attrs[i.symbol].pos);
|
||||
attrs.emplace(
|
||||
i.symbol,
|
||||
ExprAttrs::AttrDef(
|
||||
std::make_unique<ExprVar>(iPos, i.symbol),
|
||||
iPos,
|
||||
ExprAttrs::AttrDef::Kind::Inherited));
|
||||
}
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::binding::path> : change_head<AttrState> {
|
||||
static void success0(AttrState & a, BindingsState & s, State & ps) {
|
||||
s.path = std::move(a.attrs);
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::binding::value> {
|
||||
static void apply0(BindingsState & s, State & ps) {
|
||||
s.value = s->popExprOnly();
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::binding> {
|
||||
static void apply(const auto & in, BindingsState & s, State & ps) {
|
||||
ps.addAttr(&s.attrs, std::move(s.path), std::move(s.value), ps.at(in));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::id> {
|
||||
static void apply(const auto & in, ExprState & s, State & ps) {
|
||||
if (in.string_view() == "__curPos")
|
||||
s.pushExpr<ExprPos>(ps.at(in), ps.at(in));
|
||||
else
|
||||
s.pushExpr<ExprVar>(ps.at(in), ps.at(in), ps.symbols.create(in.string_view()));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::int_> {
|
||||
static void apply(const auto & in, ExprState & s, State & ps) {
|
||||
int64_t v;
|
||||
if (std::from_chars(in.begin(), in.end(), v).ec != std::errc{}) {
|
||||
throw ParseError({
|
||||
.msg = HintFmt("invalid integer '%1%'", in.string_view()),
|
||||
.pos = ps.positions[ps.at(in)],
|
||||
});
|
||||
}
|
||||
s.pushExpr<ExprInt>(noPos, v);
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::float_> {
|
||||
static void apply(const auto & in, ExprState & s, State & ps) {
|
||||
// copy the input into a temporary string so we can call stod.
|
||||
// can't use from_chars because libc++ (thus darwin) does not have it,
|
||||
// and floats are not performance-sensitive anyway. if they were you'd
|
||||
// be in much bigger trouble than this.
|
||||
//
|
||||
// we also get to do a locale-save dance because stod is locale-aware and
|
||||
// something (a plugin?) may have called setlocale or uselocale.
|
||||
static struct locale_hack {
|
||||
locale_t posix;
|
||||
locale_hack(): posix(newlocale(LC_ALL_MASK, "POSIX", 0))
|
||||
{
|
||||
if (posix == 0)
|
||||
throw SysError("could not get POSIX locale");
|
||||
}
|
||||
} locale;
|
||||
|
||||
auto tmp = in.string();
|
||||
double v = [&] {
|
||||
auto oldLocale = uselocale(locale.posix);
|
||||
Finally resetLocale([=] { uselocale(oldLocale); });
|
||||
try {
|
||||
return std::stod(tmp);
|
||||
} catch (...) {
|
||||
throw ParseError({
|
||||
.msg = HintFmt("invalid float '%1%'", in.string_view()),
|
||||
.pos = ps.positions[ps.at(in)],
|
||||
});
|
||||
}
|
||||
}();
|
||||
s.pushExpr<ExprFloat>(noPos, v);
|
||||
}
|
||||
};
|
||||
|
||||
struct StringState : SubexprState {
|
||||
using SubexprState::SubexprState;
|
||||
|
||||
std::string currentLiteral;
|
||||
PosIdx currentPos;
|
||||
std::vector<std::pair<nix::PosIdx, std::unique_ptr<Expr>>> parts;
|
||||
|
||||
void append(PosIdx pos, std::string_view s)
|
||||
{
|
||||
if (currentLiteral.empty())
|
||||
currentPos = pos;
|
||||
currentLiteral += s;
|
||||
}
|
||||
|
||||
// FIXME this truncates strings on NUL for compat with the old parser. ideally
|
||||
// we should use the decomposition the g gives us instead of iterating over
|
||||
// the entire string again.
|
||||
static void unescapeStr(std::string & str)
|
||||
{
|
||||
char * s = str.data();
|
||||
char * t = s;
|
||||
char c;
|
||||
while ((c = *s++)) {
|
||||
if (c == '\\') {
|
||||
c = *s++;
|
||||
if (c == 'n') *t = '\n';
|
||||
else if (c == 'r') *t = '\r';
|
||||
else if (c == 't') *t = '\t';
|
||||
else *t = c;
|
||||
}
|
||||
else if (c == '\r') {
|
||||
/* Normalise CR and CR/LF into LF. */
|
||||
*t = '\n';
|
||||
if (*s == '\n') s++; /* cr/lf */
|
||||
}
|
||||
else *t = c;
|
||||
t++;
|
||||
}
|
||||
str.resize(t - str.data());
|
||||
}
|
||||
|
||||
void endLiteral()
|
||||
{
|
||||
if (!currentLiteral.empty()) {
|
||||
unescapeStr(currentLiteral);
|
||||
parts.emplace_back(currentPos, std::make_unique<ExprString>(std::move(currentLiteral)));
|
||||
}
|
||||
}
|
||||
|
||||
std::unique_ptr<Expr> finish()
|
||||
{
|
||||
if (parts.empty()) {
|
||||
unescapeStr(currentLiteral);
|
||||
return std::make_unique<ExprString>(std::move(currentLiteral));
|
||||
} else {
|
||||
endLiteral();
|
||||
auto pos = parts[0].first;
|
||||
return std::make_unique<ExprConcatStrings>(pos, true, std::move(parts));
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
template<typename... Content> struct BuildAST<grammar::v1::string::literal<Content...>> {
|
||||
static void apply(const auto & in, StringState & s, State & ps) {
|
||||
s.append(ps.at(in), in.string_view());
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::string::cr_lf> {
|
||||
static void apply(const auto & in, StringState & s, State & ps) {
|
||||
s.append(ps.at(in), in.string_view()); // FIXME compat with old parser
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::string::interpolation> {
|
||||
static void apply(const auto & in, StringState & s, State & ps) {
|
||||
s.endLiteral();
|
||||
s.parts.emplace_back(ps.at(in), s->popExprOnly());
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::string::escape> {
|
||||
static void apply(const auto & in, StringState & s, State & ps) {
|
||||
s.append(ps.at(in), "\\"); // FIXME compat with old parser
|
||||
s.append(ps.at(in), in.string_view());
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::string> : change_head<StringState> {
|
||||
static void success0(StringState & s, ExprState & e, State &) {
|
||||
e.exprs.emplace_back(noPos, s.finish());
|
||||
}
|
||||
};
|
||||
|
||||
struct IndStringState : SubexprState {
|
||||
using SubexprState::SubexprState;
|
||||
|
||||
std::vector<std::pair<PosIdx, std::variant<std::unique_ptr<Expr>, StringToken>>> parts;
|
||||
};
|
||||
|
||||
template<bool Indented, typename... Content>
|
||||
struct BuildAST<grammar::v1::ind_string::literal<Indented, Content...>> {
|
||||
static void apply(const auto & in, IndStringState & s, State & ps) {
|
||||
s.parts.emplace_back(ps.at(in), StringToken{in.string_view(), Indented});
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::ind_string::interpolation> {
|
||||
static void apply(const auto & in, IndStringState & s, State & ps) {
|
||||
s.parts.emplace_back(ps.at(in), s->popExprOnly());
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::ind_string::escape> {
|
||||
static void apply(const auto & in, IndStringState & s, State & ps) {
|
||||
switch (*in.begin()) {
|
||||
case 'n': s.parts.emplace_back(ps.at(in), StringToken{"\n"}); break;
|
||||
case 'r': s.parts.emplace_back(ps.at(in), StringToken{"\r"}); break;
|
||||
case 't': s.parts.emplace_back(ps.at(in), StringToken{"\t"}); break;
|
||||
default: s.parts.emplace_back(ps.at(in), StringToken{in.string_view()}); break;
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::ind_string> : change_head<IndStringState> {
|
||||
static void success(const auto & in, IndStringState & s, ExprState & e, State & ps) {
|
||||
e.exprs.emplace_back(noPos, ps.stripIndentation(ps.at(in), std::move(s.parts)));
|
||||
}
|
||||
};
|
||||
|
||||
template<typename... Content> struct BuildAST<grammar::v1::path::literal<Content...>> {
|
||||
static void apply(const auto & in, StringState & s, State & ps) {
|
||||
s.append(ps.at(in), in.string_view());
|
||||
s.endLiteral();
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::path::interpolation> : BuildAST<grammar::v1::string::interpolation> {};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::path::anchor> {
|
||||
static void apply(const auto & in, StringState & s, State & ps) {
|
||||
Path path(absPath(in.string(), ps.basePath.path.abs()));
|
||||
/* add back in the trailing '/' to the first segment */
|
||||
if (in.string_view().ends_with('/') && in.size() > 1)
|
||||
path += "/";
|
||||
s.parts.emplace_back(ps.at(in), new ExprPath(std::move(path)));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::path::home_anchor> {
|
||||
static void apply(const auto & in, StringState & s, State & ps) {
|
||||
if (evalSettings.pureEval)
|
||||
throw Error("the path '%s' can not be resolved in pure mode", in.string_view());
|
||||
Path path(getHome() + in.string_view().substr(1));
|
||||
s.parts.emplace_back(ps.at(in), new ExprPath(std::move(path)));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::path::searched_path> {
|
||||
static void apply(const auto & in, StringState & s, State & ps) {
|
||||
std::vector<std::unique_ptr<Expr>> args{2};
|
||||
args[0] = std::make_unique<ExprVar>(ps.s.nixPath);
|
||||
args[1] = std::make_unique<ExprString>(in.string());
|
||||
s.parts.emplace_back(
|
||||
ps.at(in),
|
||||
std::make_unique<ExprCall>(
|
||||
ps.at(in),
|
||||
std::make_unique<ExprVar>(ps.s.findFile),
|
||||
std::move(args)));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::path> : change_head<StringState> {
|
||||
template<typename E>
|
||||
static void check_slash(PosIdx end, StringState & s, State & ps) {
|
||||
auto e = dynamic_cast<E *>(s.parts.back().second.get());
|
||||
if (!e || !e->s.ends_with('/'))
|
||||
return;
|
||||
if (s.parts.size() > 1 || e->s != "/")
|
||||
throw ParseError({
|
||||
.msg = HintFmt("path has a trailing slash"),
|
||||
.pos = ps.positions[end],
|
||||
});
|
||||
}
|
||||
|
||||
static void success(const auto & in, StringState & s, ExprState & e, State & ps) {
|
||||
s.endLiteral();
|
||||
check_slash<ExprPath>(ps.atEnd(in), s, ps);
|
||||
check_slash<ExprString>(ps.atEnd(in), s, ps);
|
||||
if (s.parts.size() == 1) {
|
||||
e.exprs.emplace_back(noPos, std::move(s.parts.back().second));
|
||||
} else {
|
||||
e.pushExpr<ExprConcatStrings>(ps.at(in), ps.at(in), false, std::move(s.parts));
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
// strings and paths sare handled fully by the grammar-level rule for now
|
||||
template<> struct BuildAST<grammar::v1::expr::string> : p::maybe_nothing {};
|
||||
template<> struct BuildAST<grammar::v1::expr::ind_string> : p::maybe_nothing {};
|
||||
template<> struct BuildAST<grammar::v1::expr::path> : p::maybe_nothing {};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::uri> {
|
||||
static void apply(const auto & in, ExprState & s, State & ps) {
|
||||
bool URLLiterals = ps.featureSettings.isEnabled(Dep::UrlLiterals);
|
||||
if (!URLLiterals)
|
||||
throw ParseError({
|
||||
.msg = HintFmt("URL literals are deprecated, allow using them with --extra-deprecated-features=url-literals"),
|
||||
.pos = ps.positions[ps.at(in)]
|
||||
});
|
||||
s.pushExpr<ExprString>(ps.at(in), in.string());
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::ancient_let> : change_head<BindingsState> {
|
||||
static void success(const auto & in, BindingsState & b, ExprState & s, State & ps) {
|
||||
// Added 2024-09-18. Turn into an error at some point in the future.
|
||||
// See the documentation on deprecated features for more details.
|
||||
if (!ps.featureSettings.isEnabled(Dep::AncientLet))
|
||||
warn(
|
||||
"%s found at %s. This feature is deprecated and will be removed in the future. Use %s to silence this warning.",
|
||||
"let {",
|
||||
ps.positions[ps.at(in)],
|
||||
"--extra-deprecated-features ancient-let"
|
||||
);
|
||||
|
||||
b.attrs.pos = ps.at(in);
|
||||
b.attrs.recursive = true;
|
||||
s.pushExpr<ExprSelect>(b.attrs.pos, b.attrs.pos, std::make_unique<ExprAttrs>(std::move(b.attrs)), ps.s.body);
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::rec_set> : change_head<BindingsState> {
|
||||
static void success(const auto & in, BindingsState & b, ExprState & s, State & ps) {
|
||||
// Before inserting new attrs, check for __override and throw an error
|
||||
// (the error will initially be a warning to ease migration)
|
||||
if (!featureSettings.isEnabled(Dep::RecSetOverrides) && b.attrs.attrs.contains(ps.s.overrides)) {
|
||||
ps.overridesFound(ps.at(in));
|
||||
}
|
||||
|
||||
b.attrs.pos = ps.at(in);
|
||||
b.attrs.recursive = true;
|
||||
s.pushExpr<ExprAttrs>(b.attrs.pos, std::move(b.attrs));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::set> : change_head<BindingsState> {
|
||||
static void success(const auto & in, BindingsState & b, ExprState & s, State & ps) {
|
||||
b.attrs.pos = ps.at(in);
|
||||
s.pushExpr<ExprAttrs>(b.attrs.pos, std::move(b.attrs));
|
||||
}
|
||||
};
|
||||
|
||||
using ListState = std::vector<std::unique_ptr<Expr>>;
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::list> : change_head<ListState> {
|
||||
static void success(const auto & in, ListState & ls, ExprState & s, State & ps) {
|
||||
auto e = std::make_unique<ExprList>();
|
||||
e->elems = std::move(ls);
|
||||
s.exprs.emplace_back(ps.at(in), std::move(e));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::list::entry> : change_head<ExprState> {
|
||||
static void success0(ExprState & e, ListState & s, State & ps) {
|
||||
s.emplace_back(e.finish(ps).second);
|
||||
}
|
||||
};
|
||||
|
||||
struct SelectState : SubexprState {
|
||||
using SubexprState::SubexprState;
|
||||
|
||||
PosIdx pos;
|
||||
ExprSelect * e = nullptr;
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::select::head> {
|
||||
static void apply(const auto & in, SelectState & s, State & ps) {
|
||||
s.pos = ps.at(in);
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::select::attr> : change_head<AttrState> {
|
||||
static void success0(AttrState & a, SelectState & s, State &) {
|
||||
s.e = &s->pushExpr<ExprSelect>(s.pos, s.pos, s->popExprOnly(), std::move(a.attrs), nullptr);
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::select::attr_or> {
|
||||
static void apply0(SelectState & s, State &) {
|
||||
s.e->def = s->popExprOnly();
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::select::as_app_or> {
|
||||
static void apply(const auto & in, SelectState & s, State & ps) {
|
||||
std::vector<std::unique_ptr<Expr>> args(1);
|
||||
args[0] = std::make_unique<ExprVar>(ps.at(in), ps.s.or_);
|
||||
s->pushExpr<ExprCall>(s.pos, s.pos, s->popExprOnly(), std::move(args));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::select> : change_head<SelectState> {
|
||||
static void success0(const auto &...) {}
|
||||
};
|
||||
|
||||
struct AppState : SubexprState {
|
||||
using SubexprState::SubexprState;
|
||||
|
||||
PosIdx pos;
|
||||
ExprCall * e = nullptr;
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::app::select_or_fn> {
|
||||
static void apply(const auto & in, AppState & s, State & ps) {
|
||||
s.pos = ps.at(in);
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::app::first_arg> {
|
||||
static void apply(auto & in, AppState & s, State & ps) {
|
||||
auto arg = s->popExprOnly(), fn = s->popExprOnly();
|
||||
if ((s.e = dynamic_cast<ExprCall *>(fn.get()))) {
|
||||
// TODO remove.
|
||||
// AST compat with old parser, semantics are the same.
|
||||
// this can happen on occasions such as `<p> <p>` or `a or b or`,
|
||||
// neither of which are super worth optimizing.
|
||||
s.e->args.push_back(std::move(arg));
|
||||
s->exprs.emplace_back(noPos, std::move(fn));
|
||||
} else {
|
||||
std::vector<std::unique_ptr<Expr>> args{1};
|
||||
args[0] = std::move(arg);
|
||||
s.e = &s->pushExpr<ExprCall>(s.pos, s.pos, std::move(fn), std::move(args));
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::app::another_arg> {
|
||||
static void apply0(AppState & s, State & ps) {
|
||||
s.e->args.push_back(s->popExprOnly());
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::app> : change_head<AppState> {
|
||||
static void success0(const auto &...) {}
|
||||
};
|
||||
|
||||
template<typename Op> struct BuildAST<grammar::v1::expr::operator_<Op>> {
|
||||
static void apply(const auto & in, ExprState & s, State & ps) {
|
||||
s.pushOp(ps.at(in), Op{}, ps);
|
||||
}
|
||||
};
|
||||
template<> struct BuildAST<grammar::v1::expr::operator_<grammar::v1::op::has_attr>> : change_head<AttrState> {
|
||||
static void success(const auto & in, AttrState & a, ExprState & s, State & ps) {
|
||||
s.pushOp(ps.at(in), ExprState::has_attr{{}, std::move(a.attrs)}, ps);
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::lambda::arg> {
|
||||
static void apply(const auto & in, LambdaState & s, State & ps) {
|
||||
s.arg = ps.symbols.create(in.string_view());
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::lambda> : change_head<LambdaState> {
|
||||
static void success(const auto & in, LambdaState & l, ExprState & s, State & ps) {
|
||||
if (l.formals)
|
||||
l.formals = ps.validateFormals(std::move(l.formals), ps.at(in), l.arg);
|
||||
s.pushExpr<ExprLambda>(ps.at(in), ps.at(in), l.arg, std::move(l.formals), l->popExprOnly());
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::assert_> {
|
||||
static void apply(const auto & in, ExprState & s, State & ps) {
|
||||
auto body = s.popExprOnly(), cond = s.popExprOnly();
|
||||
s.pushExpr<ExprAssert>(ps.at(in), ps.at(in), std::move(cond), std::move(body));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::with> {
|
||||
static void apply(const auto & in, ExprState & s, State & ps) {
|
||||
auto body = s.popExprOnly(), scope = s.popExprOnly();
|
||||
s.pushExpr<ExprWith>(ps.at(in), ps.at(in), std::move(scope), std::move(body));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::let> : change_head<BindingsState> {
|
||||
static void success(const auto & in, BindingsState & b, ExprState & s, State & ps) {
|
||||
if (!b.attrs.dynamicAttrs.empty())
|
||||
throw ParseError({
|
||||
.msg = HintFmt("dynamic attributes not allowed in let"),
|
||||
.pos = ps.positions[ps.at(in)]
|
||||
});
|
||||
|
||||
s.pushExpr<ExprLet>(ps.at(in), std::make_unique<ExprAttrs>(std::move(b.attrs)), b->popExprOnly());
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr::if_> {
|
||||
static void apply(const auto & in, ExprState & s, State & ps) {
|
||||
auto else_ = s.popExprOnly(), then = s.popExprOnly(), cond = s.popExprOnly();
|
||||
s.pushExpr<ExprIf>(ps.at(in), ps.at(in), std::move(cond), std::move(then), std::move(else_));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct BuildAST<grammar::v1::expr> : change_head<ExprState> {
|
||||
static void success0(ExprState & inner, ExprState & outer, State & ps) {
|
||||
outer.exprs.push_back(inner.finish(ps));
|
||||
}
|
||||
};
|
||||
|
||||
}
|
||||
}
|
||||
// Linter complains that this is a "suspicious include of file with '.cc' extension".
|
||||
// While that is correct and generally not great, it is one of the less bad options to pick
|
||||
// in terms of diff noise.
|
||||
// NOLINTNEXTLINE(bugprone-suspicious-include)
|
||||
#include "parser-impl1.inc.cc"
|
||||
|
||||
namespace nix {
|
||||
|
||||
|
|
@ -884,7 +38,6 @@ Expr * EvalState::parse(
|
|||
exprSymbols,
|
||||
featureSettings,
|
||||
};
|
||||
parser::ExprState x;
|
||||
|
||||
assert(length >= 2);
|
||||
assert(text[length - 1] == 0);
|
||||
|
|
@ -893,7 +46,12 @@ Expr * EvalState::parse(
|
|||
|
||||
p::string_input<p::tracking_mode::lazy> inp{std::string_view{text, length}, "input"};
|
||||
try {
|
||||
p::parse<parser::grammar::v1::root, parser::BuildAST, parser::Control>(inp, x, s);
|
||||
parser::v1::ExprState x;
|
||||
p::parse<parser::grammar::v1::root, parser::v1::BuildAST, parser::v1::Control>(inp, x, s);
|
||||
|
||||
auto [_pos, result] = x.finish(s);
|
||||
result->bindVars(*this, staticEnv);
|
||||
return result.release();
|
||||
} catch (p::parse_error & e) {
|
||||
auto pos = e.positions().back();
|
||||
throw ParseError({
|
||||
|
|
@ -901,10 +59,6 @@ Expr * EvalState::parse(
|
|||
.pos = positions[s.positions.add(s.origin, pos.byte)]
|
||||
});
|
||||
}
|
||||
|
||||
auto [_pos, result] = x.finish(s);
|
||||
result->bindVars(*this, staticEnv);
|
||||
return result.release();
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue