mattrob33 / grammateus Goto Github PK
View Code? Open in Web Editor NEWA Rust crate to facilitate working with Ancient Greek words
License: MIT License
A Rust crate to facilitate working with Ancient Greek words
License: MIT License
Hello, @mattrob33!
I found your crate in the "New Crates" section in crates.io. I am interesting - what is your motivation to create this package? Are you a researcher in Greek history, or linguist, or something other?
I am also want to give you a tip how you can improve your code. As I can see a GreekChar
is either have two or three bytes, but it isn't represented in its struct:
Lines 6 to 10 in c325d16
Therefore, it requires to match its length if it is not 2 or 3, although we know it can not be:
Lines 322 to 324 in c325d16
The approach to solve this problem is called "Make Illegal States Unrepresentable". In your case, we can make GreekChar
not a byte array with its length, but enum with either two or three bytes, like this:
pub enum GreekChar {
Two(u8, u8),
Three(u8, u8, u8),
}
This will allow you to get rid of unreachable checks such as checking that length is not 2 or 3. For example, this is how is_lowercase_greek
can be rewritten for new GreekChar
enum (TODO is copied from source code):
pub fn is_lowercase_greek(char: &GreekChar) -> bool {
match char {
GreekChar::Two(0xCE, 0xB1..=0xBF) => true,
GreekChar::Two(0xCF, 0x80..=0x89) => true,
GreekChar::Two(_, _) => false,
// TODO: implement is_lowercase for three-length char
GreekChar::Three(_, _, _) => panic!("Not yet implented"),
}
}
Now there is no need to check for length other than 2 or 3.
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