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LibCore: Parse classless symbolic notation
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1 changed files with 36 additions and 23 deletions
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@ -13,7 +13,8 @@
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namespace Core {
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enum State {
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Reference,
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Classes,
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Operation,
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Mode
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};
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@ -48,47 +49,59 @@ ErrorOr<FilePermissionsMask> FilePermissionsMask::from_symbolic_notation(StringV
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{
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auto mask = FilePermissionsMask();
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u8 state = State::Reference;
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u8 state = State::Classes;
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u8 classes = 0;
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u8 operation = 0;
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for (auto ch : string) {
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switch (state) {
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case State::Reference: {
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case State::Classes: {
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// one or more [ugoa] terminated by one operator [+-=]
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if (ch == 'u')
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if (ch == 'u') {
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classes |= ClassFlag::User;
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else if (ch == 'g')
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state = State::Operation;
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break;
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} else if (ch == 'g') {
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classes |= ClassFlag::Group;
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else if (ch == 'o')
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state = State::Operation;
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break;
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} else if (ch == 'o') {
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classes |= ClassFlag::Other;
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else if (ch == 'a')
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state = State::Operation;
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break;
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} else if (ch == 'a') {
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classes = ClassFlag::User | ClassFlag::Group | ClassFlag::Other;
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else {
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if (classes == 0)
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return Error::from_string_literal("invalid access class: expected 'u', 'g', 'o' or 'a' "sv);
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if (ch == '+')
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operation = Operation::Add;
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else if (ch == '-')
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operation = Operation::Remove;
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else if (ch == '=')
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operation = Operation::Assign;
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else
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return Error::from_string_literal("invalid operation: expected '+', '-' or '='"sv);
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state = State::Mode;
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state = State::Operation;
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break;
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}
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}
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[[fallthrough]];
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case State::Operation: {
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if (ch == '+')
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operation = Operation::Add;
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else if (ch == '-')
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operation = Operation::Remove;
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else if (ch == '=')
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operation = Operation::Assign;
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else if (classes == 0)
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return Error::from_string_literal("invalid access class: expected 'u', 'g', 'o' or 'a' "sv);
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else
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return Error::from_string_literal("invalid operation: expected '+', '-' or '='"sv);
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// if an operation was specified without a class, assume all
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if (classes == 0)
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classes = ClassFlag::User | ClassFlag::Group | ClassFlag::Other;
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state = State::Mode;
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break;
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}
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case State::Mode: {
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// one or more [rwx] terminated by a comma
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// End of mode part, expect reference next
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// End of mode part, expect class next
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if (ch == ',') {
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state = State::Reference;
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state = State::Classes;
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classes = operation = 0;
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continue;
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}
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