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rust-bip39-unsafe-fast
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Small optimization when only a single language is enabled

This commit is contained in:
Steven Roose 2020-09-22 13:05:26 +02:00
parent 077d594aca
commit dd72aadfdb
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GPG Key ID: 2F2A88D7F8D68E87
1 changed files with 20 additions and 2 deletions
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22
src/lib.rs
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@ -228,11 +228,23 @@ impl Mnemonic {
/// interpreted in multiple languages, an [Error::AmbiguousWordList] is
/// returned, containing the possible languages.
pub fn language_of(s: &str) -> Result<Language, Error> {
// First we try wordlists that have guaranteed unique words.
let first_word = s.split_whitespace().next().unwrap();
if first_word.len() == 0 {
return Err(Error::BadWordCount(0));
}
// For efficiency reasons, we add a special case for when there's
// only a single language enabled.
if Language::all().len() == 1 {
let lang = Language::all()[0];
return if lang.find_word(first_word).is_some() {
Ok(lang)
} else {
Err(Error::UnknownWord(first_word.to_owned()))
};
}
// Otherwise we first try wordlists that have guaranteed unique words.
for language in Language::all().iter().filter(|l| l.unique_words()) {
if language.find_word(first_word).is_some() {
return Ok(*language);
@ -272,7 +284,13 @@ impl Mnemonic {
pub fn parse<'a, S: Into<Cow<'a, str>>>(s: S) -> Result<Mnemonic, Error> {
let mut cow = s.into();
Mnemonic::normalize_utf8_cow(&mut cow);
let language = Mnemonic::language_of(cow.as_ref())?;
let language = if Language::all().len() == 1 {
Language::all()[0]
} else {
Mnemonic::language_of(cow.as_ref())?
};
Mnemonic::validate_in(language, cow.as_ref())?;
Ok(Mnemonic(cow.into_owned()))
}