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#![warn(missing_docs)]
mod set;
mod parser;
pub mod error;
use set::KanaType::{Hiragana, Katakana};
use set::{CharacterSet};
use error::Error;
pub fn to_katakana(input: &str) -> Result<String, Error> {
match validate_input(input) {
Ok(uppercase_input) => {
let set = CharacterSet::new(Katakana);
internal_transform(&set, uppercase_input)
},
Err(why) => Err(why)
}
}
pub fn to_hiragana(input: &str) -> Result<String, Error> {
match validate_input(input) {
Ok(uppercase_input) => {
let set = CharacterSet::new(Hiragana);
internal_transform(&set, uppercase_input)
},
Err(why) => Err(why)
}
}
pub fn is_valid(input: &str) -> bool {
if let Ok(uppercase_input) = validate_input(input) {
match tokenize(&uppercase_input) {
Ok(_) => return true,
Err(_) => return false,
}
}
false
}
fn validate_input(input: &str) -> Result<String, Error> {
if input.is_empty() {
return Ok(String::new())
}
if !input.is_ascii() {
return Err(Error::new("non-ASCII character in input"))
}
Ok(input.trim().to_ascii_uppercase())
}
fn internal_transform(set: &CharacterSet, uppercase_input: String) -> Result<String, Error> {
let tokens = tokenize(&uppercase_input)?;
let mut word = String::new();
for token in tokens {
match set.get(&token) {
Some(kana) => word.push_str(kana),
None => return Err(Error::new(&format!("token {} is not in map", token))),
}
}
Ok(word)
}
fn tokenize(input: &str) -> Result<Vec<&str>, Error> {
let parser = parser::Parser::new();
match parser.parse(input) {
Ok(tokens) => Ok(tokens),
Err(why) => Err(why)
}
}