nixos/nixos-option: Refactor: Move functions around
This commit is contained in:
Chuck
Maximilian Bosch
parent
09ac7cb55f
commit
9dd23e8743
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@ -197,6 +197,99 @@ void recurse(const std::function<bool(const std::string & path, std::variant<Val
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}
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}
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bool optionTypeIs(Context & ctx, Value & v, const std::string & soughtType)
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{
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try {
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const auto & typeLookup = v.attrs->find(ctx.state.sType);
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if (typeLookup == v.attrs->end()) {
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return false;
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}
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Value type = evaluateValue(ctx, *typeLookup->value);
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if (type.type != tAttrs) {
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return false;
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}
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const auto & nameLookup = type.attrs->find(ctx.state.sName);
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if (nameLookup == type.attrs->end()) {
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return false;
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}
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Value name = evaluateValue(ctx, *nameLookup->value);
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if (name.type != tString) {
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return false;
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}
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return name.string.s == soughtType;
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} catch (Error &) {
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return false;
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}
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}
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bool isAggregateOptionType(Context & ctx, Value & v)
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{
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return optionTypeIs(ctx, v, "attrsOf") || optionTypeIs(ctx, v, "listOf") || optionTypeIs(ctx, v, "loaOf");
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}
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MakeError(OptionPathError, EvalError);
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Value getSubOptions(Context & ctx, Value & option)
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{
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Value getSubOptions = evaluateValue(ctx, *findAlongAttrPath(ctx.state, "type.getSubOptions", ctx.autoArgs, option));
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if (getSubOptions.type != tLambda) {
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throw OptionPathError("Option's type.getSubOptions isn't a function");
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}
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Value emptyString{};
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nix::mkString(emptyString, "");
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Value v;
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ctx.state.callFunction(getSubOptions, emptyString, v, nix::Pos{});
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return v;
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}
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// Carefully walk an option path, looking for sub-options when a path walks past
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// an option value.
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struct FindAlongOptionPathRet
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{
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Value option;
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std::string path;
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};
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FindAlongOptionPathRet findAlongOptionPath(Context & ctx, const std::string & path)
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{
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Strings tokens = parseAttrPath(path);
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Value v = ctx.optionsRoot;
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std::string processedPath;
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for (auto i = tokens.begin(); i != tokens.end(); i++) {
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const auto & attr = *i;
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try {
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bool lastAttribute = std::next(i) == tokens.end();
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v = evaluateValue(ctx, v);
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if (attr.empty()) {
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throw OptionPathError("empty attribute name");
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}
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if (isOption(ctx, v) && optionTypeIs(ctx, v, "submodule")) {
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v = getSubOptions(ctx, v);
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}
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if (isOption(ctx, v) && isAggregateOptionType(ctx, v)) {
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auto subOptions = getSubOptions(ctx, v);
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if (lastAttribute && subOptions.attrs->empty()) {
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break;
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}
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v = subOptions;
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// Note that we've consumed attr, but didn't actually use it. This is the path component that's looked
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// up in the list or attribute set that doesn't name an option -- the "root" in "users.users.root.name".
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} else if (v.type != tAttrs) {
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throw OptionPathError("Value is %s while a set was expected", showType(v));
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} else {
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const auto & next = v.attrs->find(ctx.state.symbols.create(attr));
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if (next == v.attrs->end()) {
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throw OptionPathError("Attribute not found", attr, path);
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}
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v = *next->value;
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}
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processedPath = appendPath(processedPath, attr);
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} catch (OptionPathError & e) {
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throw OptionPathError("At '%s' in path '%s': %s", attr, path, e.msg());
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}
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}
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return {v, processedPath};
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}
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// Calls f on all the option names
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void mapOptions(const std::function<void(const std::string & path)> & f, Context & ctx, Value root)
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{
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@ -452,99 +545,6 @@ void printListing(Out & out, Value & v)
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}
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}
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bool optionTypeIs(Context & ctx, Value & v, const std::string & soughtType)
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{
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try {
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const auto & typeLookup = v.attrs->find(ctx.state.sType);
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if (typeLookup == v.attrs->end()) {
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return false;
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}
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Value type = evaluateValue(ctx, *typeLookup->value);
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if (type.type != tAttrs) {
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return false;
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}
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const auto & nameLookup = type.attrs->find(ctx.state.sName);
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if (nameLookup == type.attrs->end()) {
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return false;
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}
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Value name = evaluateValue(ctx, *nameLookup->value);
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if (name.type != tString) {
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return false;
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}
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return name.string.s == soughtType;
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} catch (Error &) {
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return false;
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}
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}
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bool isAggregateOptionType(Context & ctx, Value & v)
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{
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return optionTypeIs(ctx, v, "attrsOf") || optionTypeIs(ctx, v, "listOf") || optionTypeIs(ctx, v, "loaOf");
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}
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MakeError(OptionPathError, EvalError);
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Value getSubOptions(Context & ctx, Value & option)
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{
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Value getSubOptions = evaluateValue(ctx, *findAlongAttrPath(ctx.state, "type.getSubOptions", ctx.autoArgs, option));
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if (getSubOptions.type != tLambda) {
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throw OptionPathError("Option's type.getSubOptions isn't a function");
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}
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Value emptyString{};
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nix::mkString(emptyString, "");
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Value v;
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ctx.state.callFunction(getSubOptions, emptyString, v, nix::Pos{});
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return v;
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}
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// Carefully walk an option path, looking for sub-options when a path walks past
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// an option value.
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struct FindAlongOptionPathRet
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{
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Value option;
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std::string path;
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};
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FindAlongOptionPathRet findAlongOptionPath(Context & ctx, const std::string & path)
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{
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Strings tokens = parseAttrPath(path);
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Value v = ctx.optionsRoot;
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std::string processedPath;
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for (auto i = tokens.begin(); i != tokens.end(); i++) {
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const auto & attr = *i;
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try {
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bool lastAttribute = std::next(i) == tokens.end();
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v = evaluateValue(ctx, v);
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if (attr.empty()) {
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throw OptionPathError("empty attribute name");
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}
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if (isOption(ctx, v) && optionTypeIs(ctx, v, "submodule")) {
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v = getSubOptions(ctx, v);
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}
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if (isOption(ctx, v) && isAggregateOptionType(ctx, v)) {
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auto subOptions = getSubOptions(ctx, v);
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if (lastAttribute && subOptions.attrs->empty()) {
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break;
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}
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v = subOptions;
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// Note that we've consumed attr, but didn't actually use it. This is the path component that's looked
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// up in the list or attribute set that doesn't name an option -- the "root" in "users.users.root.name".
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} else if (v.type != tAttrs) {
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throw OptionPathError("Value is %s while a set was expected", showType(v));
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} else {
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const auto & next = v.attrs->find(ctx.state.symbols.create(attr));
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if (next == v.attrs->end()) {
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throw OptionPathError("Attribute not found", attr, path);
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}
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v = *next->value;
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}
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processedPath = appendPath(processedPath, attr);
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} catch (OptionPathError & e) {
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throw OptionPathError("At '%s' in path '%s': %s", attr, path, e.msg());
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}
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}
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return {v, processedPath};
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}
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void printOne(Context & ctx, Out & out, const std::string & path)
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{
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try {
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