Implement From<&[char]> for GString
#862
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API docs are being generated and will be shortly available at: https://godot-rust.github.io/docs/gdext/pr-862 |
| @@ -69,12 +69,14 @@ fn string_chars() { | |||
| // Empty tests regression from #228: Null pointer passed to slice::from_raw_parts(). | |||
| let string = GString::new(); | |||
| assert_eq!(string.chars(), &[]); | |||
| assert_eq!(string, GString::from(&[][..])); | |||
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&[][..] is quite weird 🤔 please the expected variable separately and annotate with &[char] type.
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How about [].as_slice()?
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I would still add &[char] so it's clear that this conversion is being tested. Type erasure and compact expressions can be nice sometimes, but tests should primarily be readable and easy to understand. Any indirection to figure out that we're looking at a char slice (not just a slice) is an unnecessary obstacle.
And once you have that, [].as_slice() involves arrays without a very good reason, so you could just have &[] 😉
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To be fair; doesn't &[] involve arrays, too? 🤔
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You're right, that was a bit imprecise. What I meant is that &[1, 2, 3] is very common syntax, but [1, 2, 3].as_slice() makes readers think "what is this?"; same for empty ones 🙂
Also, sorry to be nitpicky, but I wrote "variable separately" above. You did an as cast instead.
assert_eq!(string, GString::from(&[] as &[char]));Please change this to
let empty: &[char] = &[];
assert_eq!(string, GString::from(empty));Again because people may wonder "why cast a type into itself" and lints may actually flag this in the future.
| let ctor = interface_fn!(string_new_with_utf32_chars_and_len); | ||
| ctor( | ||
| string_ptr, | ||
| chars.as_ptr() as *const char32_t, |
| @@ -225,6 +225,21 @@ impl From<&str> for GString { | |||
| } | |||
| } | |||
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| impl From<&[char]> for GString { | |||
| fn from(chars: &[char]) -> Self { | |||
| unsafe { | |||
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Since this isn't completely obvious, you should maybe add a // SAFETY line saying something about UTF-32.
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| let string = String::from("some_string"); | ||
| let string_chars: Vec<char> = string.chars().collect(); | ||
| let gstring = GString::from(string); | ||
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| assert_eq!(string_chars, gstring.chars().to_vec()); | ||
| assert_eq!(gstring, GString::from(&string_chars[..])); |
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Also here, a separate variable with an expressive name. The fact that you operate on &[char] slices here is very well-hidden, it needn't be.
Bromeon
changed the title
From<&[char]> for GString
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| let string = String::from("some_string"); | ||
| let string_chars: Vec<char> = string.chars().collect(); | ||
| let gstring = GString::from(string); | ||
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| assert_eq!(string_chars, gstring.chars().to_vec()); | ||
| assert_eq!(gstring, GString::from(string_chars.as_slice())); |
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In this case I'd say it's fine because Vec<char> is just explicitly declared above, and Vec::as_slice() is sufficiently clear 👍
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