forked from lix-project/lix
Merge pull request #9776 from pennae/parser-refactor
Refactor the parser somewhat
This commit is contained in:
commit
b83a2fb6dd
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@ -21,6 +21,9 @@
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#include "gc-small-vector.hh"
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#include "url.hh"
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#include "fetch-to-store.hh"
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#include "tarball.hh"
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#include "flake/flakeref.hh"
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#include "parser-tab.hh"
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#include <algorithm>
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#include <chrono>
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@ -417,6 +420,16 @@ EvalState::EvalState(
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, sPath(symbols.create("path"))
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, sPrefix(symbols.create("prefix"))
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, sOutputSpecified(symbols.create("outputSpecified"))
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, exprSymbols{
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.sub = symbols.create("__sub"),
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.lessThan = symbols.create("__lessThan"),
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.mul = symbols.create("__mul"),
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.div = symbols.create("__div"),
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.or_ = symbols.create("or"),
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.findFile = symbols.create("__findFile"),
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.nixPath = symbols.create("__nixPath"),
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.body = symbols.create("body"),
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}
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, repair(NoRepair)
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, emptyBindings(0)
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, rootFS(
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@ -2666,6 +2679,183 @@ void EvalState::printStatistics()
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}
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SourcePath resolveExprPath(SourcePath path)
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{
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unsigned int followCount = 0, maxFollow = 1024;
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/* If `path' is a symlink, follow it. This is so that relative
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path references work. */
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while (!path.path.isRoot()) {
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// Basic cycle/depth limit to avoid infinite loops.
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if (++followCount >= maxFollow)
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throw Error("too many symbolic links encountered while traversing the path '%s'", path);
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auto p = path.parent().resolveSymlinks() + path.baseName();
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if (p.lstat().type != InputAccessor::tSymlink) break;
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path = {path.accessor, CanonPath(p.readLink(), path.path.parent().value_or(CanonPath::root))};
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}
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/* If `path' refers to a directory, append `/default.nix'. */
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if (path.resolveSymlinks().lstat().type == InputAccessor::tDirectory)
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return path + "default.nix";
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return path;
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}
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Expr * EvalState::parseExprFromFile(const SourcePath & path)
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{
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return parseExprFromFile(path, staticBaseEnv);
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}
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Expr * EvalState::parseExprFromFile(const SourcePath & path, std::shared_ptr<StaticEnv> & staticEnv)
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{
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auto buffer = path.resolveSymlinks().readFile();
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// readFile hopefully have left some extra space for terminators
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buffer.append("\0\0", 2);
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return parse(buffer.data(), buffer.size(), Pos::Origin(path), path.parent(), staticEnv);
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}
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Expr * EvalState::parseExprFromString(std::string s_, const SourcePath & basePath, std::shared_ptr<StaticEnv> & staticEnv)
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{
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auto s = make_ref<std::string>(std::move(s_));
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s->append("\0\0", 2);
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return parse(s->data(), s->size(), Pos::String{.source = s}, basePath, staticEnv);
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}
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Expr * EvalState::parseExprFromString(std::string s, const SourcePath & basePath)
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{
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return parseExprFromString(std::move(s), basePath, staticBaseEnv);
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}
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Expr * EvalState::parseStdin()
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{
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//Activity act(*logger, lvlTalkative, "parsing standard input");
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auto buffer = drainFD(0);
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// drainFD should have left some extra space for terminators
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buffer.append("\0\0", 2);
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auto s = make_ref<std::string>(std::move(buffer));
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return parse(s->data(), s->size(), Pos::Stdin{.source = s}, rootPath(CanonPath::fromCwd()), staticBaseEnv);
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}
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SourcePath EvalState::findFile(const std::string_view path)
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{
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return findFile(searchPath, path);
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}
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SourcePath EvalState::findFile(const SearchPath & searchPath, const std::string_view path, const PosIdx pos)
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{
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for (auto & i : searchPath.elements) {
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auto suffixOpt = i.prefix.suffixIfPotentialMatch(path);
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if (!suffixOpt) continue;
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auto suffix = *suffixOpt;
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auto rOpt = resolveSearchPathPath(i.path);
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if (!rOpt) continue;
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auto r = *rOpt;
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Path res = suffix == "" ? r : concatStrings(r, "/", suffix);
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if (pathExists(res)) return rootPath(CanonPath(canonPath(res)));
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}
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if (hasPrefix(path, "nix/"))
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return {corepkgsFS, CanonPath(path.substr(3))};
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debugThrow(ThrownError({
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.msg = hintfmt(evalSettings.pureEval
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? "cannot look up '<%s>' in pure evaluation mode (use '--impure' to override)"
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: "file '%s' was not found in the Nix search path (add it using $NIX_PATH or -I)",
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path),
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.errPos = positions[pos]
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}), 0, 0);
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}
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std::optional<std::string> EvalState::resolveSearchPathPath(const SearchPath::Path & value0, bool initAccessControl)
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{
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auto & value = value0.s;
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auto i = searchPathResolved.find(value);
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if (i != searchPathResolved.end()) return i->second;
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std::optional<std::string> res;
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if (EvalSettings::isPseudoUrl(value)) {
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try {
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auto storePath = fetchers::downloadTarball(
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store, EvalSettings::resolvePseudoUrl(value), "source", false).storePath;
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res = { store->toRealPath(storePath) };
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} catch (FileTransferError & e) {
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logWarning({
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.msg = hintfmt("Nix search path entry '%1%' cannot be downloaded, ignoring", value)
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});
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}
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}
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else if (hasPrefix(value, "flake:")) {
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experimentalFeatureSettings.require(Xp::Flakes);
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auto flakeRef = parseFlakeRef(value.substr(6), {}, true, false);
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debug("fetching flake search path element '%s''", value);
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auto storePath = flakeRef.resolve(store).fetchTree(store).first;
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res = { store->toRealPath(storePath) };
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}
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else {
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auto path = absPath(value);
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/* Allow access to paths in the search path. */
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if (initAccessControl) {
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allowPath(path);
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if (store->isInStore(path)) {
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try {
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StorePathSet closure;
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store->computeFSClosure(store->toStorePath(path).first, closure);
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for (auto & p : closure)
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allowPath(p);
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} catch (InvalidPath &) { }
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}
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}
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if (pathExists(path))
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res = { path };
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else {
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logWarning({
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.msg = hintfmt("Nix search path entry '%1%' does not exist, ignoring", value)
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});
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res = std::nullopt;
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}
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}
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if (res)
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debug("resolved search path element '%s' to '%s'", value, *res);
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else
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debug("failed to resolve search path element '%s'", value);
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searchPathResolved.emplace(value, res);
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return res;
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}
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Expr * EvalState::parse(
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char * text,
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size_t length,
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Pos::Origin origin,
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const SourcePath & basePath,
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std::shared_ptr<StaticEnv> & staticEnv)
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{
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auto result = parseExprFromBuf(text, length, origin, basePath, symbols, positions, rootFS, exprSymbols);
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result->bindVars(*this, staticEnv);
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return result;
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}
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std::string ExternalValueBase::coerceToString(const Pos & pos, NixStringContext & context, bool copyMore, bool copyToStore) const
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{
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throw TypeError({
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@ -207,6 +207,8 @@ public:
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sPrefix,
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sOutputSpecified;
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const Expr::AstSymbols exprSymbols;
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/**
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* If set, force copying files to the Nix store even if they
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* already exist there.
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@ -29,12 +29,7 @@ using namespace nix;
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namespace nix {
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static inline PosIdx makeCurPos(const YYLTYPE & loc, ParseData * data)
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{
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return data->state.positions.add(data->origin, loc.first_line, loc.first_column);
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}
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#define CUR_POS makeCurPos(*yylloc, data)
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#define CUR_POS state->at(*yylloc)
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static void initLoc(YYLTYPE * loc)
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{
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@ -153,7 +148,7 @@ or { return OR_KW; }
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} catch (const boost::bad_lexical_cast &) {
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throw ParseError({
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.msg = hintfmt("invalid integer '%1%'", yytext),
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.errPos = data->state.positions[CUR_POS],
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.errPos = state->positions[CUR_POS],
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});
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}
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return INT_LIT;
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@ -163,7 +158,7 @@ or { return OR_KW; }
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if (errno != 0)
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throw ParseError({
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.msg = hintfmt("invalid float '%1%'", yytext),
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.errPos = data->state.positions[CUR_POS],
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.errPos = state->positions[CUR_POS],
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});
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return FLOAT_LIT;
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}
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@ -186,7 +181,7 @@ or { return OR_KW; }
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/* It is impossible to match strings ending with '$' with one
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regex because trailing contexts are only valid at the end
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of a rule. (A sane but undocumented limitation.) */
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yylval->str = unescapeStr(data->symbols, yytext, yyleng);
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yylval->str = unescapeStr(state->symbols, yytext, yyleng);
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return STR;
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}
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<STRING>\$\{ { PUSH_STATE(DEFAULT); return DOLLAR_CURLY; }
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@ -214,7 +209,7 @@ or { return OR_KW; }
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return IND_STR;
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}
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<IND_STRING>\'\'\\{ANY} {
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yylval->str = unescapeStr(data->symbols, yytext + 2, yyleng - 2);
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yylval->str = unescapeStr(state->symbols, yytext + 2, yyleng - 2);
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return IND_STR;
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}
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<IND_STRING>\$\{ { PUSH_STATE(DEFAULT); return DOLLAR_CURLY; }
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@ -292,7 +287,7 @@ or { return OR_KW; }
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<INPATH_SLASH><<EOF>> {
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throw ParseError({
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.msg = hintfmt("path has a trailing slash"),
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.errPos = data->state.positions[CUR_POS],
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.errPos = state->positions[CUR_POS],
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});
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}
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@ -9,6 +9,8 @@
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namespace nix {
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unsigned long Expr::nrExprs = 0;
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ExprBlackHole eBlackHole;
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// FIXME: remove, because *symbols* are abstract and do not have a single
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@ -140,6 +140,11 @@ std::string showAttrPath(const SymbolTable & symbols, const AttrPath & attrPath)
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struct Expr
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{
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struct AstSymbols {
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Symbol sub, lessThan, mul, div, or_, findFile, nixPath, body;
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};
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static unsigned long nrExprs;
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Expr() {
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nrExprs++;
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271
src/libexpr/parser-state.hh
Normal file
271
src/libexpr/parser-state.hh
Normal file
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@ -0,0 +1,271 @@
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#pragma once
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///@file
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#include "eval.hh"
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namespace nix {
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/**
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* @note Storing a C-style `char *` and `size_t` allows us to avoid
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* having to define the special members that using string_view here
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* would implicitly delete.
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*/
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struct StringToken
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{
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const char * p;
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size_t l;
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bool hasIndentation;
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operator std::string_view() const { return {p, l}; }
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};
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struct ParserLocation
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{
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int first_line, first_column;
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int last_line, last_column;
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// backup to recover from yyless(0)
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int stashed_first_line, stashed_first_column;
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int stashed_last_line, stashed_last_column;
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void stash() {
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stashed_first_line = first_line;
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stashed_first_column = first_column;
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stashed_last_line = last_line;
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stashed_last_column = last_column;
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}
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void unstash() {
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first_line = stashed_first_line;
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first_column = stashed_first_column;
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last_line = stashed_last_line;
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last_column = stashed_last_column;
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}
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};
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struct ParserState
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{
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SymbolTable & symbols;
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PosTable & positions;
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Expr * result;
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SourcePath basePath;
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PosTable::Origin origin;
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const ref<InputAccessor> rootFS;
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const Expr::AstSymbols & s;
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void dupAttr(const AttrPath & attrPath, const PosIdx pos, const PosIdx prevPos);
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void dupAttr(Symbol attr, const PosIdx pos, const PosIdx prevPos);
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void addAttr(ExprAttrs * attrs, AttrPath && attrPath, Expr * e, const PosIdx pos);
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Formals * validateFormals(Formals * formals, PosIdx pos = noPos, Symbol arg = {});
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Expr * stripIndentation(const PosIdx pos,
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std::vector<std::pair<PosIdx, std::variant<Expr *, StringToken>>> && es);
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PosIdx at(const ParserLocation & loc);
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};
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inline void ParserState::dupAttr(const AttrPath & attrPath, const PosIdx pos, const PosIdx prevPos)
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{
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throw ParseError({
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.msg = hintfmt("attribute '%1%' already defined at %2%",
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showAttrPath(symbols, attrPath), positions[prevPos]),
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.errPos = positions[pos]
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});
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}
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inline void ParserState::dupAttr(Symbol attr, const PosIdx pos, const PosIdx prevPos)
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{
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throw ParseError({
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.msg = hintfmt("attribute '%1%' already defined at %2%", symbols[attr], positions[prevPos]),
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.errPos = positions[pos]
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});
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}
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inline void ParserState::addAttr(ExprAttrs * attrs, AttrPath && attrPath, Expr * e, const PosIdx pos)
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{
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AttrPath::iterator i;
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// All attrpaths have at least one attr
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assert(!attrPath.empty());
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// Checking attrPath validity.
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// ===========================
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for (i = attrPath.begin(); i + 1 < attrPath.end(); i++) {
|
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if (i->symbol) {
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ExprAttrs::AttrDefs::iterator j = attrs->attrs.find(i->symbol);
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if (j != attrs->attrs.end()) {
|
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if (!j->second.inherited) {
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ExprAttrs * attrs2 = dynamic_cast<ExprAttrs *>(j->second.e);
|
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if (!attrs2) dupAttr(attrPath, pos, j->second.pos);
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attrs = attrs2;
|
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} else
|
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dupAttr(attrPath, pos, j->second.pos);
|
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} else {
|
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ExprAttrs * nested = new ExprAttrs;
|
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attrs->attrs[i->symbol] = ExprAttrs::AttrDef(nested, pos);
|
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attrs = nested;
|
||||
}
|
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} else {
|
||||
ExprAttrs *nested = new ExprAttrs;
|
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attrs->dynamicAttrs.push_back(ExprAttrs::DynamicAttrDef(i->expr, nested, pos));
|
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attrs = nested;
|
||||
}
|
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}
|
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// Expr insertion.
|
||||
// ==========================
|
||||
if (i->symbol) {
|
||||
ExprAttrs::AttrDefs::iterator j = attrs->attrs.find(i->symbol);
|
||||
if (j != attrs->attrs.end()) {
|
||||
// This attr path is already defined. However, if both
|
||||
// e and the expr pointed by the attr path are two attribute sets,
|
||||
// we want to merge them.
|
||||
// Otherwise, throw an error.
|
||||
auto ae = dynamic_cast<ExprAttrs *>(e);
|
||||
auto jAttrs = dynamic_cast<ExprAttrs *>(j->second.e);
|
||||
if (jAttrs && ae) {
|
||||
for (auto & ad : ae->attrs) {
|
||||
auto j2 = jAttrs->attrs.find(ad.first);
|
||||
if (j2 != jAttrs->attrs.end()) // Attr already defined in iAttrs, error.
|
||||
dupAttr(ad.first, j2->second.pos, ad.second.pos);
|
||||
jAttrs->attrs.emplace(ad.first, ad.second);
|
||||
}
|
||||
jAttrs->dynamicAttrs.insert(jAttrs->dynamicAttrs.end(), ae->dynamicAttrs.begin(), ae->dynamicAttrs.end());
|
||||
} else {
|
||||
dupAttr(attrPath, pos, j->second.pos);
|
||||
}
|
||||
} else {
|
||||
// This attr path is not defined. Let's create it.
|
||||
attrs->attrs.emplace(i->symbol, ExprAttrs::AttrDef(e, pos));
|
||||
e->setName(i->symbol);
|
||||
}
|
||||
} else {
|
||||
attrs->dynamicAttrs.push_back(ExprAttrs::DynamicAttrDef(i->expr, e, pos));
|
||||
}
|
||||
}
|
||||
|
||||
inline Formals * ParserState::validateFormals(Formals * formals, PosIdx pos, Symbol arg)
|
||||
{
|
||||
std::sort(formals->formals.begin(), formals->formals.end(),
|
||||
[] (const auto & a, const auto & b) {
|
||||
return std::tie(a.name, a.pos) < std::tie(b.name, b.pos);
|
||||
});
|
||||
|
||||
std::optional<std::pair<Symbol, PosIdx>> duplicate;
|
||||
for (size_t i = 0; i + 1 < formals->formals.size(); i++) {
|
||||
if (formals->formals[i].name != formals->formals[i + 1].name)
|
||||
continue;
|
||||
std::pair thisDup{formals->formals[i].name, formals->formals[i + 1].pos};
|
||||
duplicate = std::min(thisDup, duplicate.value_or(thisDup));
|
||||
}
|
||||
if (duplicate)
|
||||
throw ParseError({
|
||||
.msg = hintfmt("duplicate formal function argument '%1%'", symbols[duplicate->first]),
|
||||
.errPos = positions[duplicate->second]
|
||||
});
|
||||
|
||||
if (arg && formals->has(arg))
|
||||
throw ParseError({
|
||||
.msg = hintfmt("duplicate formal function argument '%1%'", symbols[arg]),
|
||||
.errPos = positions[pos]
|
||||
});
|
||||
|
||||
return formals;
|
||||
}
|
||||
|
||||
inline Expr * ParserState::stripIndentation(const PosIdx pos,
|
||||
std::vector<std::pair<PosIdx, std::variant<Expr *, StringToken>>> && es)
|
||||
{
|
||||
if (es.empty()) return new ExprString("");
|
||||
|
||||
/* Figure out the minimum indentation. Note that by design
|
||||
whitespace-only final lines are not taken into account. (So
|
||||
the " " in "\n ''" is ignored, but the " " in "\n foo''" is.) */
|
||||
bool atStartOfLine = true; /* = seen only whitespace in the current line */
|
||||
size_t minIndent = 1000000;
|
||||
size_t curIndent = 0;
|
||||
for (auto & [i_pos, i] : es) {
|
||||
auto * str = std::get_if<StringToken>(&i);
|
||||
if (!str || !str->hasIndentation) {
|
||||
/* Anti-quotations and escaped characters end the current start-of-line whitespace. */
|
||||
if (atStartOfLine) {
|
||||
atStartOfLine = false;
|
||||
if (curIndent < minIndent) minIndent = curIndent;
|
||||
}
|
||||
continue;
|
||||
}
|
||||
for (size_t j = 0; j < str->l; ++j) {
|
||||
if (atStartOfLine) {
|
||||
if (str->p[j] == ' ')
|
||||
curIndent++;
|
||||
else if (str->p[j] == '\n') {
|
||||
/* Empty line, doesn't influence minimum
|
||||
indentation. */
|
||||
curIndent = 0;
|
||||
} else {
|
||||
atStartOfLine = false;
|
||||
if (curIndent < minIndent) minIndent = curIndent;
|
||||
}
|
||||
} else if (str->p[j] == '\n') {
|
||||
atStartOfLine = true;
|
||||
curIndent = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* Strip spaces from each line. */
|
||||
auto * es2 = new std::vector<std::pair<PosIdx, Expr *>>;
|
||||
atStartOfLine = true;
|
||||
size_t curDropped = 0;
|
||||
size_t n = es.size();
|
||||
auto i = es.begin();
|
||||
const auto trimExpr = [&] (Expr * e) {
|
||||
atStartOfLine = false;
|
||||
curDropped = 0;
|
||||
es2->emplace_back(i->first, e);
|
||||
};
|
||||
const auto trimString = [&] (const StringToken & t) {
|
||||
std::string s2;
|
||||
for (size_t j = 0; j < t.l; ++j) {
|
||||
if (atStartOfLine) {
|
||||
if (t.p[j] == ' ') {
|
||||
if (curDropped++ >= minIndent)
|
||||
s2 += t.p[j];
|
||||
}
|
||||
else if (t.p[j] == '\n') {
|
||||
curDropped = 0;
|
||||
s2 += t.p[j];
|
||||
} else {
|
||||
atStartOfLine = false;
|
||||
curDropped = 0;
|
||||
s2 += t.p[j];
|
||||
}
|
||||
} else {
|
||||
s2 += t.p[j];
|
||||
if (t.p[j] == '\n') atStartOfLine = true;
|
||||
}
|
||||
}
|
||||
|
||||
/* Remove the last line if it is empty and consists only of
|
||||
spaces. */
|
||||
if (n == 1) {
|
||||
std::string::size_type p = s2.find_last_of('\n');
|
||||
if (p != std::string::npos && s2.find_first_not_of(' ', p + 1) == std::string::npos)
|
||||
s2 = std::string(s2, 0, p + 1);
|
||||
}
|
||||
|
||||
es2->emplace_back(i->first, new ExprString(std::move(s2)));
|
||||
};
|
||||
for (; i != es.end(); ++i, --n) {
|
||||
std::visit(overloaded { trimExpr, trimString }, i->second);
|
||||
}
|
||||
|
||||
/* If this is a single string, then don't do a concatenation. */
|
||||
if (es2->size() == 1 && dynamic_cast<ExprString *>((*es2)[0].second)) {
|
||||
auto *const result = (*es2)[0].second;
|
||||
delete es2;
|
||||
return result;
|
||||
}
|
||||
return new ExprConcatStrings(pos, true, es2);
|
||||
}
|
||||
|
||||
inline PosIdx ParserState::at(const ParserLocation & loc)
|
||||
{
|
||||
return positions.add(origin, loc.first_line, loc.first_column);
|
||||
}
|
||||
|
||||
}
|
|
@ -5,9 +5,9 @@
|
|||
%defines
|
||||
/* %no-lines */
|
||||
%parse-param { void * scanner }
|
||||
%parse-param { nix::ParseData * data }
|
||||
%parse-param { nix::ParserState * state }
|
||||
%lex-param { void * scanner }
|
||||
%lex-param { nix::ParseData * data }
|
||||
%lex-param { nix::ParserState * state }
|
||||
%expect 1
|
||||
%expect-rr 1
|
||||
|
||||
|
@ -18,6 +18,7 @@
|
|||
|
||||
#include <variant>
|
||||
|
||||
#include "finally.hh"
|
||||
#include "util.hh"
|
||||
#include "users.hh"
|
||||
|
||||
|
@ -25,63 +26,26 @@
|
|||
#include "eval.hh"
|
||||
#include "eval-settings.hh"
|
||||
#include "globals.hh"
|
||||
#include "parser-state.hh"
|
||||
|
||||
#define YYLTYPE ::nix::ParserLocation
|
||||
#define YY_DECL int yylex \
|
||||
(YYSTYPE * yylval_param, YYLTYPE * yylloc_param, yyscan_t yyscanner, nix::ParserState * state)
|
||||
|
||||
namespace nix {
|
||||
|
||||
#define YYLTYPE ::nix::ParserLocation
|
||||
struct ParserLocation
|
||||
{
|
||||
int first_line, first_column;
|
||||
int last_line, last_column;
|
||||
|
||||
// backup to recover from yyless(0)
|
||||
int stashed_first_line, stashed_first_column;
|
||||
int stashed_last_line, stashed_last_column;
|
||||
|
||||
void stash() {
|
||||
stashed_first_line = first_line;
|
||||
stashed_first_column = first_column;
|
||||
stashed_last_line = last_line;
|
||||
stashed_last_column = last_column;
|
||||
}
|
||||
|
||||
void unstash() {
|
||||
first_line = stashed_first_line;
|
||||
first_column = stashed_first_column;
|
||||
last_line = stashed_last_line;
|
||||
last_column = stashed_last_column;
|
||||
}
|
||||
};
|
||||
|
||||
struct ParseData
|
||||
{
|
||||
EvalState & state;
|
||||
SymbolTable & symbols;
|
||||
Expr * result;
|
||||
SourcePath basePath;
|
||||
PosTable::Origin origin;
|
||||
std::optional<ErrorInfo> error;
|
||||
};
|
||||
|
||||
struct ParserFormals {
|
||||
std::vector<Formal> formals;
|
||||
bool ellipsis = false;
|
||||
};
|
||||
Expr * parseExprFromBuf(
|
||||
char * text,
|
||||
size_t length,
|
||||
Pos::Origin origin,
|
||||
const SourcePath & basePath,
|
||||
SymbolTable & symbols,
|
||||
PosTable & positions,
|
||||
const ref<InputAccessor> rootFS,
|
||||
const Expr::AstSymbols & astSymbols);
|
||||
|
||||
}
|
||||
|
||||
// using C a struct allows us to avoid having to define the special
|
||||
// members that using string_view here would implicitly delete.
|
||||
struct StringToken {
|
||||
const char * p;
|
||||
size_t l;
|
||||
bool hasIndentation;
|
||||
operator std::string_view() const { return {p, l}; }
|
||||
};
|
||||
|
||||
#define YY_DECL int yylex \
|
||||
(YYSTYPE * yylval_param, YYLTYPE * yylloc_param, yyscan_t yyscanner, nix::ParseData * data)
|
||||
|
||||
#endif
|
||||
|
||||
}
|
||||
|
@ -95,240 +59,15 @@ YY_DECL;
|
|||
|
||||
using namespace nix;
|
||||
|
||||
|
||||
namespace nix {
|
||||
#define CUR_POS state->at(*yylocp)
|
||||
|
||||
|
||||
static void dupAttr(const EvalState & state, const AttrPath & attrPath, const PosIdx pos, const PosIdx prevPos)
|
||||
void yyerror(YYLTYPE * loc, yyscan_t scanner, ParserState * state, const char * error)
|
||||
{
|
||||
throw ParseError({
|
||||
.msg = hintfmt("attribute '%1%' already defined at %2%",
|
||||
showAttrPath(state.symbols, attrPath), state.positions[prevPos]),
|
||||
.errPos = state.positions[pos]
|
||||
});
|
||||
}
|
||||
|
||||
static void dupAttr(const EvalState & state, Symbol attr, const PosIdx pos, const PosIdx prevPos)
|
||||
{
|
||||
throw ParseError({
|
||||
.msg = hintfmt("attribute '%1%' already defined at %2%", state.symbols[attr], state.positions[prevPos]),
|
||||
.errPos = state.positions[pos]
|
||||
});
|
||||
}
|
||||
|
||||
|
||||
static void addAttr(ExprAttrs * attrs, AttrPath && attrPath,
|
||||
Expr * e, const PosIdx pos, const nix::EvalState & state)
|
||||
{
|
||||
AttrPath::iterator i;
|
||||
// All attrpaths have at least one attr
|
||||
assert(!attrPath.empty());
|
||||
// Checking attrPath validity.
|
||||
// ===========================
|
||||
for (i = attrPath.begin(); i + 1 < attrPath.end(); i++) {
|
||||
if (i->symbol) {
|
||||
ExprAttrs::AttrDefs::iterator j = attrs->attrs.find(i->symbol);
|
||||
if (j != attrs->attrs.end()) {
|
||||
if (!j->second.inherited) {
|
||||
ExprAttrs * attrs2 = dynamic_cast<ExprAttrs *>(j->second.e);
|
||||
if (!attrs2) dupAttr(state, attrPath, pos, j->second.pos);
|
||||
attrs = attrs2;
|
||||
} else
|
||||
dupAttr(state, attrPath, pos, j->second.pos);
|
||||
} else {
|
||||
ExprAttrs * nested = new ExprAttrs;
|
||||
attrs->attrs[i->symbol] = ExprAttrs::AttrDef(nested, pos);
|
||||
attrs = nested;
|
||||
}
|
||||
} else {
|
||||
ExprAttrs *nested = new ExprAttrs;
|
||||
attrs->dynamicAttrs.push_back(ExprAttrs::DynamicAttrDef(i->expr, nested, pos));
|
||||
attrs = nested;
|
||||
}
|
||||
}
|
||||
// Expr insertion.
|
||||
// ==========================
|
||||
if (i->symbol) {
|
||||
ExprAttrs::AttrDefs::iterator j = attrs->attrs.find(i->symbol);
|
||||
if (j != attrs->attrs.end()) {
|
||||
// This attr path is already defined. However, if both
|
||||
// e and the expr pointed by the attr path are two attribute sets,
|
||||
// we want to merge them.
|
||||
// Otherwise, throw an error.
|
||||
auto ae = dynamic_cast<ExprAttrs *>(e);
|
||||
auto jAttrs = dynamic_cast<ExprAttrs *>(j->second.e);
|
||||
if (jAttrs && ae) {
|
||||
for (auto & ad : ae->attrs) {
|
||||
auto j2 = jAttrs->attrs.find(ad.first);
|
||||
if (j2 != jAttrs->attrs.end()) // Attr already defined in iAttrs, error.
|
||||
dupAttr(state, ad.first, j2->second.pos, ad.second.pos);
|
||||
jAttrs->attrs.emplace(ad.first, ad.second);
|
||||
}
|
||||
jAttrs->dynamicAttrs.insert(jAttrs->dynamicAttrs.end(), ae->dynamicAttrs.begin(), ae->dynamicAttrs.end());
|
||||
} else {
|
||||
dupAttr(state, attrPath, pos, j->second.pos);
|
||||
}
|
||||
} else {
|
||||
// This attr path is not defined. Let's create it.
|
||||
attrs->attrs.emplace(i->symbol, ExprAttrs::AttrDef(e, pos));
|
||||
e->setName(i->symbol);
|
||||
}
|
||||
} else {
|
||||
attrs->dynamicAttrs.push_back(ExprAttrs::DynamicAttrDef(i->expr, e, pos));
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static Formals * toFormals(ParseData & data, ParserFormals * formals,
|
||||
PosIdx pos = noPos, Symbol arg = {})
|
||||
{
|
||||
std::sort(formals->formals.begin(), formals->formals.end(),
|
||||
[] (const auto & a, const auto & b) {
|
||||
return std::tie(a.name, a.pos) < std::tie(b.name, b.pos);
|
||||
});
|
||||
|
||||
std::optional<std::pair<Symbol, PosIdx>> duplicate;
|
||||
for (size_t i = 0; i + 1 < formals->formals.size(); i++) {
|
||||
if (formals->formals[i].name != formals->formals[i + 1].name)
|
||||
continue;
|
||||
std::pair thisDup{formals->formals[i].name, formals->formals[i + 1].pos};
|
||||
duplicate = std::min(thisDup, duplicate.value_or(thisDup));
|
||||
}
|
||||
if (duplicate)
|
||||
throw ParseError({
|
||||
.msg = hintfmt("duplicate formal function argument '%1%'", data.symbols[duplicate->first]),
|
||||
.errPos = data.state.positions[duplicate->second]
|
||||
});
|
||||
|
||||
Formals result;
|
||||
result.ellipsis = formals->ellipsis;
|
||||
result.formals = std::move(formals->formals);
|
||||
|
||||
if (arg && result.has(arg))
|
||||
throw ParseError({
|
||||
.msg = hintfmt("duplicate formal function argument '%1%'", data.symbols[arg]),
|
||||
.errPos = data.state.positions[pos]
|
||||
});
|
||||
|
||||
delete formals;
|
||||
return new Formals(std::move(result));
|
||||
}
|
||||
|
||||
|
||||
static Expr * stripIndentation(const PosIdx pos, SymbolTable & symbols,
|
||||
std::vector<std::pair<PosIdx, std::variant<Expr *, StringToken>>> && es)
|
||||
{
|
||||
if (es.empty()) return new ExprString("");
|
||||
|
||||
/* Figure out the minimum indentation. Note that by design
|
||||
whitespace-only final lines are not taken into account. (So
|
||||
the " " in "\n ''" is ignored, but the " " in "\n foo''" is.) */
|
||||
bool atStartOfLine = true; /* = seen only whitespace in the current line */
|
||||
size_t minIndent = 1000000;
|
||||
size_t curIndent = 0;
|
||||
for (auto & [i_pos, i] : es) {
|
||||
auto * str = std::get_if<StringToken>(&i);
|
||||
if (!str || !str->hasIndentation) {
|
||||
/* Anti-quotations and escaped characters end the current start-of-line whitespace. */
|
||||
if (atStartOfLine) {
|
||||
atStartOfLine = false;
|
||||
if (curIndent < minIndent) minIndent = curIndent;
|
||||
}
|
||||
continue;
|
||||
}
|
||||
for (size_t j = 0; j < str->l; ++j) {
|
||||
if (atStartOfLine) {
|
||||
if (str->p[j] == ' ')
|
||||
curIndent++;
|
||||
else if (str->p[j] == '\n') {
|
||||
/* Empty line, doesn't influence minimum
|
||||
indentation. */
|
||||
curIndent = 0;
|
||||
} else {
|
||||
atStartOfLine = false;
|
||||
if (curIndent < minIndent) minIndent = curIndent;
|
||||
}
|
||||
} else if (str->p[j] == '\n') {
|
||||
atStartOfLine = true;
|
||||
curIndent = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* Strip spaces from each line. */
|
||||
auto * es2 = new std::vector<std::pair<PosIdx, Expr *>>;
|
||||
atStartOfLine = true;
|
||||
size_t curDropped = 0;
|
||||
size_t n = es.size();
|
||||
auto i = es.begin();
|
||||
const auto trimExpr = [&] (Expr * e) {
|
||||
atStartOfLine = false;
|
||||
curDropped = 0;
|
||||
es2->emplace_back(i->first, e);
|
||||
};
|
||||
const auto trimString = [&] (const StringToken & t) {
|
||||
std::string s2;
|
||||
for (size_t j = 0; j < t.l; ++j) {
|
||||
if (atStartOfLine) {
|
||||
if (t.p[j] == ' ') {
|
||||
if (curDropped++ >= minIndent)
|
||||
s2 += t.p[j];
|
||||
}
|
||||
else if (t.p[j] == '\n') {
|
||||
curDropped = 0;
|
||||
s2 += t.p[j];
|
||||
} else {
|
||||
atStartOfLine = false;
|
||||
curDropped = 0;
|
||||
s2 += t.p[j];
|
||||
}
|
||||
} else {
|
||||
s2 += t.p[j];
|
||||
if (t.p[j] == '\n') atStartOfLine = true;
|
||||
}
|
||||
}
|
||||
|
||||
/* Remove the last line if it is empty and consists only of
|
||||
spaces. */
|
||||
if (n == 1) {
|
||||
std::string::size_type p = s2.find_last_of('\n');
|
||||
if (p != std::string::npos && s2.find_first_not_of(' ', p + 1) == std::string::npos)
|
||||
s2 = std::string(s2, 0, p + 1);
|
||||
}
|
||||
|
||||
es2->emplace_back(i->first, new ExprString(std::move(s2)));
|
||||
};
|
||||
for (; i != es.end(); ++i, --n) {
|
||||
std::visit(overloaded { trimExpr, trimString }, i->second);
|
||||
}
|
||||
|
||||
/* If this is a single string, then don't do a concatenation. */
|
||||
if (es2->size() == 1 && dynamic_cast<ExprString *>((*es2)[0].second)) {
|
||||
auto *const result = (*es2)[0].second;
|
||||
delete es2;
|
||||
return result;
|
||||
}
|
||||
return new ExprConcatStrings(pos, true, es2);
|
||||
}
|
||||
|
||||
|
||||
static inline PosIdx makeCurPos(const YYLTYPE & loc, ParseData * data)
|
||||
{
|
||||
return data->state.positions.add(data->origin, loc.first_line, loc.first_column);
|
||||
}
|
||||
|
||||
#define CUR_POS makeCurPos(*yylocp, data)
|
||||
|
||||
|
||||
}
|
||||
|
||||
|
||||
void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, const char * error)
|
||||
{
|
||||
data->error = {
|
||||
.msg = hintfmt(error),
|
||||
.errPos = data->state.positions[makeCurPos(*loc, data)]
|
||||
};
|
||||
.errPos = state->positions[state->at(*loc)]
|
||||
});
|
||||
}
|
||||
|
||||
|
||||
|
@ -339,17 +78,17 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, const char * err
|
|||
nix::Expr * e;
|
||||
nix::ExprList * list;
|
||||
nix::ExprAttrs * attrs;
|
||||
nix::ParserFormals * formals;
|
||||
nix::Formals * formals;
|
||||
nix::Formal * formal;
|
||||
nix::NixInt n;
|
||||
nix::NixFloat nf;
|
||||
StringToken id; // !!! -> Symbol
|
||||
StringToken path;
|
||||
StringToken uri;
|
||||
StringToken str;
|
||||
nix::StringToken id; // !!! -> Symbol
|
||||
nix::StringToken path;
|
||||
nix::StringToken uri;
|
||||
nix::StringToken str;
|
||||
std::vector<nix::AttrName> * attrNames;
|
||||
std::vector<std::pair<nix::PosIdx, nix::Expr *>> * string_parts;
|
||||
std::vector<std::pair<nix::PosIdx, std::variant<nix::Expr *, StringToken>>> * ind_string_parts;
|
||||
std::vector<std::pair<nix::PosIdx, std::variant<nix::Expr *, nix::StringToken>>> * ind_string_parts;
|
||||
}
|
||||
|
||||
%type <e> start expr expr_function expr_if expr_op
|
||||
|
@ -389,24 +128,24 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, const char * err
|
|||
|
||||
%%
|
||||
|
||||
start: expr { data->result = $1; };
|
||||
start: expr { state->result = $1; };
|
||||
|
||||
expr: expr_function;
|
||||
|
||||
expr_function
|
||||
: ID ':' expr_function
|
||||
{ $$ = new ExprLambda(CUR_POS, data->symbols.create($1), 0, $3); }
|
||||
{ $$ = new ExprLambda(CUR_POS, state->symbols.create($1), 0, $3); }
|
||||
| '{' formals '}' ':' expr_function
|
||||
{ $$ = new ExprLambda(CUR_POS, toFormals(*data, $2), $5); }
|
||||
{ $$ = new ExprLambda(CUR_POS, state->validateFormals($2), $5); }
|
||||
| '{' formals '}' '@' ID ':' expr_function
|
||||
{
|
||||
auto arg = data->symbols.create($5);
|
||||
$$ = new ExprLambda(CUR_POS, arg, toFormals(*data, $2, CUR_POS, arg), $7);
|
||||
auto arg = state->symbols.create($5);
|
||||
$$ = new ExprLambda(CUR_POS, arg, state->validateFormals($2, CUR_POS, arg), $7);
|
||||
}
|
||||
| ID '@' '{' formals '}' ':' expr_function
|
||||
{
|
||||
auto arg = data->symbols.create($1);
|
||||
$$ = new ExprLambda(CUR_POS, arg, toFormals(*data, $4, CUR_POS, arg), $7);
|
||||
auto arg = state->symbols.create($1);
|
||||
$$ = new ExprLambda(CUR_POS, arg, state->validateFormals($4, CUR_POS, arg), $7);
|
||||
}
|
||||
| ASSERT expr ';' expr_function
|
||||
{ $$ = new ExprAssert(CUR_POS, $2, $4); }
|
||||
|
@ -416,7 +155,7 @@ expr_function
|
|||
{ if (!$2->dynamicAttrs.empty())
|
||||
throw ParseError({
|
||||
.msg = hintfmt("dynamic attributes not allowed in let"),
|
||||
.errPos = data->state.positions[CUR_POS]
|
||||
.errPos = state->positions[CUR_POS]
|
||||
});
|
||||
$$ = new ExprLet($2, $4);
|
||||
}
|
||||
|
@ -430,24 +169,24 @@ expr_if
|
|||
|
||||
expr_op
|
||||
: '!' expr_op %prec NOT { $$ = new ExprOpNot($2); }
|
||||
| '-' expr_op %prec NEGATE { $$ = new ExprCall(CUR_POS, new ExprVar(data->symbols.create("__sub")), {new ExprInt(0), $2}); }
|
||||
| '-' expr_op %prec NEGATE { $$ = new ExprCall(CUR_POS, new ExprVar(state->s.sub), {new ExprInt(0), $2}); }
|
||||
| expr_op EQ expr_op { $$ = new ExprOpEq($1, $3); }
|
||||
| expr_op NEQ expr_op { $$ = new ExprOpNEq($1, $3); }
|
||||
| expr_op '<' expr_op { $$ = new ExprCall(makeCurPos(@2, data), new ExprVar(data->symbols.create("__lessThan")), {$1, $3}); }
|
||||
| expr_op LEQ expr_op { $$ = new ExprOpNot(new ExprCall(makeCurPos(@2, data), new ExprVar(data->symbols.create("__lessThan")), {$3, $1})); }
|
||||
| expr_op '>' expr_op { $$ = new ExprCall(makeCurPos(@2, data), new ExprVar(data->symbols.create("__lessThan")), {$3, $1}); }
|
||||
| expr_op GEQ expr_op { $$ = new ExprOpNot(new ExprCall(makeCurPos(@2, data), new ExprVar(data->symbols.create("__lessThan")), {$1, $3})); }
|
||||
| expr_op AND expr_op { $$ = new ExprOpAnd(makeCurPos(@2, data), $1, $3); }
|
||||
| expr_op OR expr_op { $$ = new ExprOpOr(makeCurPos(@2, data), $1, $3); }
|
||||
| expr_op IMPL expr_op { $$ = new ExprOpImpl(makeCurPos(@2, data), $1, $3); }
|
||||
| expr_op UPDATE expr_op { $$ = new ExprOpUpdate(makeCurPos(@2, data), $1, $3); }
|
||||
| expr_op '<' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->s.lessThan), {$1, $3}); }
|
||||
| expr_op LEQ expr_op { $$ = new ExprOpNot(new ExprCall(state->at(@2), new ExprVar(state->s.lessThan), {$3, $1})); }
|
||||
| expr_op '>' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->s.lessThan), {$3, $1}); }
|
||||
| expr_op GEQ expr_op { $$ = new ExprOpNot(new ExprCall(state->at(@2), new ExprVar(state->s.lessThan), {$1, $3})); }
|
||||
| expr_op AND expr_op { $$ = new ExprOpAnd(state->at(@2), $1, $3); }
|
||||
| expr_op OR expr_op { $$ = new ExprOpOr(state->at(@2), $1, $3); }
|
||||
| expr_op IMPL expr_op { $$ = new ExprOpImpl(state->at(@2), $1, $3); }
|
||||
| expr_op UPDATE expr_op { $$ = new ExprOpUpdate(state->at(@2), $1, $3); }
|
||||
| expr_op '?' attrpath { $$ = new ExprOpHasAttr($1, std::move(*$3)); delete $3; }
|
||||
| expr_op '+' expr_op
|
||||
{ $$ = new ExprConcatStrings(makeCurPos(@2, data), false, new std::vector<std::pair<PosIdx, Expr *> >({{makeCurPos(@1, data), $1}, {makeCurPos(@3, data), $3}})); }
|
||||
| expr_op '-' expr_op { $$ = new ExprCall(makeCurPos(@2, data), new ExprVar(data->symbols.create("__sub")), {$1, $3}); }
|
||||
| expr_op '*' expr_op { $$ = new ExprCall(makeCurPos(@2, data), new ExprVar(data->symbols.create("__mul")), {$1, $3}); }
|
||||
| expr_op '/' expr_op { $$ = new ExprCall(makeCurPos(@2, data), new ExprVar(data->symbols.create("__div")), {$1, $3}); }
|
||||
| expr_op CONCAT expr_op { $$ = new ExprOpConcatLists(makeCurPos(@2, data), $1, $3); }
|
||||
{ $$ = new ExprConcatStrings(state->at(@2), false, new std::vector<std::pair<PosIdx, Expr *> >({{state->at(@1), $1}, {state->at(@3), $3}})); }
|
||||
| expr_op '-' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->s.sub), {$1, $3}); }
|
||||
| expr_op '*' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->s.mul), {$1, $3}); }
|
||||
| expr_op '/' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->s.div), {$1, $3}); }
|
||||
| expr_op CONCAT expr_op { $$ = new ExprOpConcatLists(state->at(@2), $1, $3); }
|
||||
| expr_app
|
||||
;
|
||||
|
||||
|
@ -470,7 +209,7 @@ expr_select
|
|||
| /* Backwards compatibility: because Nixpkgs has a rarely used
|
||||
function named ‘or’, allow stuff like ‘map or [...]’. */
|
||||
expr_simple OR_KW
|
||||
{ $$ = new ExprCall(CUR_POS, $1, {new ExprVar(CUR_POS, data->symbols.create("or"))}); }
|
||||
{ $$ = new ExprCall(CUR_POS, $1, {new ExprVar(CUR_POS, state->s.or_)}); }
|
||||
| expr_simple
|
||||
;
|
||||
|
||||
|
@ -480,25 +219,25 @@ expr_simple
|
|||
if ($1.l == s.size() && strncmp($1.p, s.data(), s.size()) == 0)
|
||||
$$ = new ExprPos(CUR_POS);
|
||||
else
|
||||
$$ = new ExprVar(CUR_POS, data->symbols.create($1));
|
||||
$$ = new ExprVar(CUR_POS, state->symbols.create($1));
|
||||
}
|
||||
| INT_LIT { $$ = new ExprInt($1); }
|
||||
| FLOAT_LIT { $$ = new ExprFloat($1); }
|
||||
| '"' string_parts '"' { $$ = $2; }
|
||||
| IND_STRING_OPEN ind_string_parts IND_STRING_CLOSE {
|
||||
$$ = stripIndentation(CUR_POS, data->symbols, std::move(*$2));
|
||||
$$ = state->stripIndentation(CUR_POS, std::move(*$2));
|
||||
delete $2;
|
||||
}
|
||||
| path_start PATH_END
|
||||
| path_start string_parts_interpolated PATH_END {
|
||||
$2->insert($2->begin(), {makeCurPos(@1, data), $1});
|
||||
$2->insert($2->begin(), {state->at(@1), $1});
|
||||
$$ = new ExprConcatStrings(CUR_POS, false, $2);
|
||||
}
|
||||
| SPATH {
|
||||
std::string path($1.p + 1, $1.l - 2);
|
||||
$$ = new ExprCall(CUR_POS,
|
||||
new ExprVar(data->symbols.create("__findFile")),
|
||||
{new ExprVar(data->symbols.create("__nixPath")),
|
||||
new ExprVar(state->s.findFile),
|
||||
{new ExprVar(state->s.nixPath),
|
||||
new ExprString(std::move(path))});
|
||||
}
|
||||
| URI {
|
||||
|
@ -506,7 +245,7 @@ expr_simple
|
|||
if (noURLLiterals)
|
||||
throw ParseError({
|
||||
.msg = hintfmt("URL literals are disabled"),
|
||||
.errPos = data->state.positions[CUR_POS]
|
||||
.errPos = state->positions[CUR_POS]
|
||||
});
|
||||
$$ = new ExprString(std::string($1));
|
||||
}
|
||||
|
@ -514,7 +253,7 @@ expr_simple
|
|||
/* Let expressions `let {..., body = ...}' are just desugared
|
||||
into `(rec {..., body = ...}).body'. */
|
||||
| LET '{' binds '}'
|
||||
{ $3->recursive = true; $$ = new ExprSelect(noPos, $3, data->symbols.create("body")); }
|
||||
{ $3->recursive = true; $$ = new ExprSelect(noPos, $3, state->s.body); }
|
||||
| REC '{' binds '}'
|
||||
{ $3->recursive = true; $$ = $3; }
|
||||
| '{' binds '}'
|
||||
|
@ -530,23 +269,23 @@ string_parts
|
|||
|
||||
string_parts_interpolated
|
||||
: string_parts_interpolated STR
|
||||
{ $$ = $1; $1->emplace_back(makeCurPos(@2, data), new ExprString(std::string($2))); }
|
||||
| string_parts_interpolated DOLLAR_CURLY expr '}' { $$ = $1; $1->emplace_back(makeCurPos(@2, data), $3); }
|
||||
| DOLLAR_CURLY expr '}' { $$ = new std::vector<std::pair<PosIdx, Expr *>>; $$->emplace_back(makeCurPos(@1, data), $2); }
|
||||
{ $$ = $1; $1->emplace_back(state->at(@2), new ExprString(std::string($2))); }
|
||||
| string_parts_interpolated DOLLAR_CURLY expr '}' { $$ = $1; $1->emplace_back(state->at(@2), $3); }
|
||||
| DOLLAR_CURLY expr '}' { $$ = new std::vector<std::pair<PosIdx, Expr *>>; $$->emplace_back(state->at(@1), $2); }
|
||||
| STR DOLLAR_CURLY expr '}' {
|
||||
$$ = new std::vector<std::pair<PosIdx, Expr *>>;
|
||||
$$->emplace_back(makeCurPos(@1, data), new ExprString(std::string($1)));
|
||||
$$->emplace_back(makeCurPos(@2, data), $3);
|
||||
$$->emplace_back(state->at(@1), new ExprString(std::string($1)));
|
||||
$$->emplace_back(state->at(@2), $3);
|
||||
}
|
||||
;
|
||||
|
||||
path_start
|
||||
: PATH {
|
||||
Path path(absPath({$1.p, $1.l}, data->basePath.path.abs()));
|
||||
Path path(absPath({$1.p, $1.l}, state->basePath.path.abs()));
|
||||
/* add back in the trailing '/' to the first segment */
|
||||
if ($1.p[$1.l-1] == '/' && $1.l > 1)
|
||||
path += "/";
|
||||
$$ = new ExprPath(ref<InputAccessor>(data->state.rootFS), std::move(path));
|
||||
$$ = new ExprPath(ref<InputAccessor>(state->rootFS), std::move(path));
|
||||
}
|
||||
| HPATH {
|
||||
if (evalSettings.pureEval) {
|
||||
|
@ -556,24 +295,24 @@ path_start
|
|||
);
|
||||
}
|
||||
Path path(getHome() + std::string($1.p + 1, $1.l - 1));
|
||||
$$ = new ExprPath(ref<InputAccessor>(data->state.rootFS), std::move(path));
|
||||
$$ = new ExprPath(ref<InputAccessor>(state->rootFS), std::move(path));
|
||||
}
|
||||
;
|
||||
|
||||
ind_string_parts
|
||||
: ind_string_parts IND_STR { $$ = $1; $1->emplace_back(makeCurPos(@2, data), $2); }
|
||||
| ind_string_parts DOLLAR_CURLY expr '}' { $$ = $1; $1->emplace_back(makeCurPos(@2, data), $3); }
|
||||
: ind_string_parts IND_STR { $$ = $1; $1->emplace_back(state->at(@2), $2); }
|
||||
| ind_string_parts DOLLAR_CURLY expr '}' { $$ = $1; $1->emplace_back(state->at(@2), $3); }
|
||||
| { $$ = new std::vector<std::pair<PosIdx, std::variant<Expr *, StringToken>>>; }
|
||||
;
|
||||
|
||||
binds
|
||||
: binds attrpath '=' expr ';' { $$ = $1; addAttr($$, std::move(*$2), $4, makeCurPos(@2, data), data->state); delete $2; }
|
||||
: binds attrpath '=' expr ';' { $$ = $1; state->addAttr($$, std::move(*$2), $4, state->at(@2)); delete $2; }
|
||||
| binds INHERIT attrs ';'
|
||||
{ $$ = $1;
|
||||
for (auto & i : *$3) {
|
||||
if ($$->attrs.find(i.symbol) != $$->attrs.end())
|
||||
dupAttr(data->state, i.symbol, makeCurPos(@3, data), $$->attrs[i.symbol].pos);
|
||||
auto pos = makeCurPos(@3, data);
|
||||
state->dupAttr(i.symbol, state->at(@3), $$->attrs[i.symbol].pos);
|
||||
auto pos = state->at(@3);
|
||||
$$->attrs.emplace(i.symbol, ExprAttrs::AttrDef(new ExprVar(CUR_POS, i.symbol), pos, true));
|
||||
}
|
||||
delete $3;
|
||||
|
@ -583,48 +322,48 @@ binds
|
|||
/* !!! Should ensure sharing of the expression in $4. */
|
||||
for (auto & i : *$6) {
|
||||
if ($$->attrs.find(i.symbol) != $$->attrs.end())
|
||||
dupAttr(data->state, i.symbol, makeCurPos(@6, data), $$->attrs[i.symbol].pos);
|
||||
$$->attrs.emplace(i.symbol, ExprAttrs::AttrDef(new ExprSelect(CUR_POS, $4, i.symbol), makeCurPos(@6, data)));
|
||||
state->dupAttr(i.symbol, state->at(@6), $$->attrs[i.symbol].pos);
|
||||
$$->attrs.emplace(i.symbol, ExprAttrs::AttrDef(new ExprSelect(CUR_POS, $4, i.symbol), state->at(@6)));
|
||||
}
|
||||
delete $6;
|
||||
}
|
||||
| { $$ = new ExprAttrs(makeCurPos(@0, data)); }
|
||||
| { $$ = new ExprAttrs(state->at(@0)); }
|
||||
;
|
||||
|
||||
attrs
|
||||
: attrs attr { $$ = $1; $1->push_back(AttrName(data->symbols.create($2))); }
|
||||
: attrs attr { $$ = $1; $1->push_back(AttrName(state->symbols.create($2))); }
|
||||
| attrs string_attr
|
||||
{ $$ = $1;
|
||||
ExprString * str = dynamic_cast<ExprString *>($2);
|
||||
if (str) {
|
||||
$$->push_back(AttrName(data->symbols.create(str->s)));
|
||||
$$->push_back(AttrName(state->symbols.create(str->s)));
|
||||
delete str;
|
||||
} else
|
||||
throw ParseError({
|
||||
.msg = hintfmt("dynamic attributes not allowed in inherit"),
|
||||
.errPos = data->state.positions[makeCurPos(@2, data)]
|
||||
.errPos = state->positions[state->at(@2)]
|
||||
});
|
||||
}
|
||||
| { $$ = new AttrPath; }
|
||||
;
|
||||
|
||||
attrpath
|
||||
: attrpath '.' attr { $$ = $1; $1->push_back(AttrName(data->symbols.create($3))); }
|
||||
: attrpath '.' attr { $$ = $1; $1->push_back(AttrName(state->symbols.create($3))); }
|
||||
| attrpath '.' string_attr
|
||||
{ $$ = $1;
|
||||
ExprString * str = dynamic_cast<ExprString *>($3);
|
||||
if (str) {
|
||||
$$->push_back(AttrName(data->symbols.create(str->s)));
|
||||
$$->push_back(AttrName(state->symbols.create(str->s)));
|
||||
delete str;
|
||||
} else
|
||||
$$->push_back(AttrName($3));
|
||||
}
|
||||
| attr { $$ = new std::vector<AttrName>; $$->push_back(AttrName(data->symbols.create($1))); }
|
||||
| attr { $$ = new std::vector<AttrName>; $$->push_back(AttrName(state->symbols.create($1))); }
|
||||
| string_attr
|
||||
{ $$ = new std::vector<AttrName>;
|
||||
ExprString *str = dynamic_cast<ExprString *>($1);
|
||||
if (str) {
|
||||
$$->push_back(AttrName(data->symbols.create(str->s)));
|
||||
$$->push_back(AttrName(state->symbols.create(str->s)));
|
||||
delete str;
|
||||
} else
|
||||
$$->push_back(AttrName($1));
|
||||
|
@ -650,226 +389,52 @@ formals
|
|||
: formal ',' formals
|
||||
{ $$ = $3; $$->formals.emplace_back(*$1); delete $1; }
|
||||
| formal
|
||||
{ $$ = new ParserFormals; $$->formals.emplace_back(*$1); $$->ellipsis = false; delete $1; }
|
||||
{ $$ = new Formals; $$->formals.emplace_back(*$1); $$->ellipsis = false; delete $1; }
|
||||
|
|
||||
{ $$ = new ParserFormals; $$->ellipsis = false; }
|
||||
{ $$ = new Formals; $$->ellipsis = false; }
|
||||
| ELLIPSIS
|
||||
{ $$ = new ParserFormals; $$->ellipsis = true; }
|
||||
{ $$ = new Formals; $$->ellipsis = true; }
|
||||
;
|
||||
|
||||
formal
|
||||
: ID { $$ = new Formal{CUR_POS, data->symbols.create($1), 0}; }
|
||||
| ID '?' expr { $$ = new Formal{CUR_POS, data->symbols.create($1), $3}; }
|
||||
: ID { $$ = new Formal{CUR_POS, state->symbols.create($1), 0}; }
|
||||
| ID '?' expr { $$ = new Formal{CUR_POS, state->symbols.create($1), $3}; }
|
||||
;
|
||||
|
||||
%%
|
||||
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <sys/stat.h>
|
||||
#include <fcntl.h>
|
||||
#include <unistd.h>
|
||||
|
||||
#include "eval.hh"
|
||||
#include "filetransfer.hh"
|
||||
#include "tarball.hh"
|
||||
#include "store-api.hh"
|
||||
#include "flake/flake.hh"
|
||||
#include "fs-input-accessor.hh"
|
||||
#include "memory-input-accessor.hh"
|
||||
|
||||
|
||||
namespace nix {
|
||||
|
||||
unsigned long Expr::nrExprs = 0;
|
||||
|
||||
Expr * EvalState::parse(
|
||||
Expr * parseExprFromBuf(
|
||||
char * text,
|
||||
size_t length,
|
||||
Pos::Origin origin,
|
||||
const SourcePath & basePath,
|
||||
std::shared_ptr<StaticEnv> & staticEnv)
|
||||
SymbolTable & symbols,
|
||||
PosTable & positions,
|
||||
const ref<InputAccessor> rootFS,
|
||||
const Expr::AstSymbols & astSymbols)
|
||||
{
|
||||
yyscan_t scanner;
|
||||
ParseData data {
|
||||
.state = *this,
|
||||
ParserState state {
|
||||
.symbols = symbols,
|
||||
.positions = positions,
|
||||
.basePath = basePath,
|
||||
.origin = {origin},
|
||||
.rootFS = rootFS,
|
||||
.s = astSymbols,
|
||||
};
|
||||
|
||||
yylex_init(&scanner);
|
||||
Finally _destroy([&] { yylex_destroy(scanner); });
|
||||
|
||||
yy_scan_buffer(text, length, scanner);
|
||||
int res = yyparse(scanner, &data);
|
||||
yylex_destroy(scanner);
|
||||
yyparse(scanner, &state);
|
||||
|
||||
if (res) throw ParseError(data.error.value());
|
||||
|
||||
data.result->bindVars(*this, staticEnv);
|
||||
|
||||
return data.result;
|
||||
}
|
||||
|
||||
|
||||
SourcePath resolveExprPath(SourcePath path)
|
||||
{
|
||||
unsigned int followCount = 0, maxFollow = 1024;
|
||||
|
||||
/* If `path' is a symlink, follow it. This is so that relative
|
||||
path references work. */
|
||||
while (!path.path.isRoot()) {
|
||||
// Basic cycle/depth limit to avoid infinite loops.
|
||||
if (++followCount >= maxFollow)
|
||||
throw Error("too many symbolic links encountered while traversing the path '%s'", path);
|
||||
auto p = path.parent().resolveSymlinks() + path.baseName();
|
||||
if (p.lstat().type != InputAccessor::tSymlink) break;
|
||||
path = {path.accessor, CanonPath(p.readLink(), path.path.parent().value_or(CanonPath::root))};
|
||||
}
|
||||
|
||||
/* If `path' refers to a directory, append `/default.nix'. */
|
||||
if (path.resolveSymlinks().lstat().type == InputAccessor::tDirectory)
|
||||
return path + "default.nix";
|
||||
|
||||
return path;
|
||||
}
|
||||
|
||||
|
||||
Expr * EvalState::parseExprFromFile(const SourcePath & path)
|
||||
{
|
||||
return parseExprFromFile(path, staticBaseEnv);
|
||||
}
|
||||
|
||||
|
||||
Expr * EvalState::parseExprFromFile(const SourcePath & path, std::shared_ptr<StaticEnv> & staticEnv)
|
||||
{
|
||||
auto buffer = path.resolveSymlinks().readFile();
|
||||
// readFile hopefully have left some extra space for terminators
|
||||
buffer.append("\0\0", 2);
|
||||
return parse(buffer.data(), buffer.size(), Pos::Origin(path), path.parent(), staticEnv);
|
||||
}
|
||||
|
||||
|
||||
Expr * EvalState::parseExprFromString(std::string s_, const SourcePath & basePath, std::shared_ptr<StaticEnv> & staticEnv)
|
||||
{
|
||||
auto s = make_ref<std::string>(std::move(s_));
|
||||
s->append("\0\0", 2);
|
||||
return parse(s->data(), s->size(), Pos::String{.source = s}, basePath, staticEnv);
|
||||
}
|
||||
|
||||
|
||||
Expr * EvalState::parseExprFromString(std::string s, const SourcePath & basePath)
|
||||
{
|
||||
return parseExprFromString(std::move(s), basePath, staticBaseEnv);
|
||||
}
|
||||
|
||||
|
||||
Expr * EvalState::parseStdin()
|
||||
{
|
||||
//Activity act(*logger, lvlTalkative, "parsing standard input");
|
||||
auto buffer = drainFD(0);
|
||||
// drainFD should have left some extra space for terminators
|
||||
buffer.append("\0\0", 2);
|
||||
auto s = make_ref<std::string>(std::move(buffer));
|
||||
return parse(s->data(), s->size(), Pos::Stdin{.source = s}, rootPath(CanonPath::fromCwd()), staticBaseEnv);
|
||||
}
|
||||
|
||||
|
||||
SourcePath EvalState::findFile(const std::string_view path)
|
||||
{
|
||||
return findFile(searchPath, path);
|
||||
}
|
||||
|
||||
|
||||
SourcePath EvalState::findFile(const SearchPath & searchPath, const std::string_view path, const PosIdx pos)
|
||||
{
|
||||
for (auto & i : searchPath.elements) {
|
||||
auto suffixOpt = i.prefix.suffixIfPotentialMatch(path);
|
||||
|
||||
if (!suffixOpt) continue;
|
||||
auto suffix = *suffixOpt;
|
||||
|
||||
auto rOpt = resolveSearchPathPath(i.path);
|
||||
if (!rOpt) continue;
|
||||
auto r = *rOpt;
|
||||
|
||||
Path res = suffix == "" ? r : concatStrings(r, "/", suffix);
|
||||
if (pathExists(res)) return rootPath(CanonPath(canonPath(res)));
|
||||
}
|
||||
|
||||
if (hasPrefix(path, "nix/"))
|
||||
return {corepkgsFS, CanonPath(path.substr(3))};
|
||||
|
||||
debugThrow(ThrownError({
|
||||
.msg = hintfmt(evalSettings.pureEval
|
||||
? "cannot look up '<%s>' in pure evaluation mode (use '--impure' to override)"
|
||||
: "file '%s' was not found in the Nix search path (add it using $NIX_PATH or -I)",
|
||||
path),
|
||||
.errPos = positions[pos]
|
||||
}), 0, 0);
|
||||
}
|
||||
|
||||
|
||||
std::optional<std::string> EvalState::resolveSearchPathPath(const SearchPath::Path & value0, bool initAccessControl)
|
||||
{
|
||||
auto & value = value0.s;
|
||||
auto i = searchPathResolved.find(value);
|
||||
if (i != searchPathResolved.end()) return i->second;
|
||||
|
||||
std::optional<std::string> res;
|
||||
|
||||
if (EvalSettings::isPseudoUrl(value)) {
|
||||
try {
|
||||
auto storePath = fetchers::downloadTarball(
|
||||
store, EvalSettings::resolvePseudoUrl(value), "source", false).storePath;
|
||||
res = { store->toRealPath(storePath) };
|
||||
} catch (FileTransferError & e) {
|
||||
logWarning({
|
||||
.msg = hintfmt("Nix search path entry '%1%' cannot be downloaded, ignoring", value)
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
else if (hasPrefix(value, "flake:")) {
|
||||
experimentalFeatureSettings.require(Xp::Flakes);
|
||||
auto flakeRef = parseFlakeRef(value.substr(6), {}, true, false);
|
||||
debug("fetching flake search path element '%s''", value);
|
||||
auto storePath = flakeRef.resolve(store).fetchTree(store).first;
|
||||
res = { store->toRealPath(storePath) };
|
||||
}
|
||||
|
||||
else {
|
||||
auto path = absPath(value);
|
||||
|
||||
/* Allow access to paths in the search path. */
|
||||
if (initAccessControl) {
|
||||
allowPath(path);
|
||||
if (store->isInStore(path)) {
|
||||
try {
|
||||
StorePathSet closure;
|
||||
store->computeFSClosure(store->toStorePath(path).first, closure);
|
||||
for (auto & p : closure)
|
||||
allowPath(p);
|
||||
} catch (InvalidPath &) { }
|
||||
}
|
||||
}
|
||||
|
||||
if (pathExists(path))
|
||||
res = { path };
|
||||
else {
|
||||
logWarning({
|
||||
.msg = hintfmt("Nix search path entry '%1%' does not exist, ignoring", value)
|
||||
});
|
||||
res = std::nullopt;
|
||||
}
|
||||
}
|
||||
|
||||
if (res)
|
||||
debug("resolved search path element '%s' to '%s'", value, *res);
|
||||
else
|
||||
debug("failed to resolve search path element '%s'", value);
|
||||
|
||||
searchPathResolved.emplace(value, res);
|
||||
return res;
|
||||
return state.result;
|
||||
}
|
||||
|
||||
|
||||
|
|
Loading…
Reference in a new issue