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use std::collections::HashMap;
mod plurals;
mod utils;
const _PLURAL: &str = "_PLURAL";
#[derive(Debug, PartialEq)]
pub enum PlurrError {
EmptyPlaceholder,
EmptyVariants,
NotZeroOrPositiveValue,
UnmatchedOpeningBrace,
UnmatchedClosingBrace,
UndefinedParameter,
UndefinedParameterPairs,
}
type PlurrParams = HashMap<String, String>;
#[derive(Debug)]
pub struct Plurr<'a> {
locale: &'a str,
auto_plurals: bool,
strict: bool,
params: PlurrParams,
}
impl<'a> Default for Plurr<'a> {
fn default() -> Self {
Plurr::new()
}
}
impl<'a> Plurr<'a> {
pub fn new() -> Self {
Self {
locale: "en",
auto_plurals: true,
strict: true,
params: PlurrParams::new(),
}
}
pub fn locale(&mut self, locale_code: &'a str) -> &mut Self {
self.locale = locale_code;
self
}
pub fn auto_plurals(&mut self, auto_plurals: bool) -> &mut Self {
self.auto_plurals = auto_plurals;
self
}
pub fn strict(&mut self, strict: bool) -> &mut Self {
self.strict = strict;
self
}
pub fn param<T: ToString>(&mut self, key: &str, value: T) -> &mut Self {
self.params.insert(key.to_string(), value.to_string());
self
}
pub fn format(&mut self, value: &str) -> Result<String, PlurrError> {
let mut bracket_count = 0;
let mut blocks = vec!["".to_string()];
for chunk in utils::split_string(value, "{", "}") {
if chunk == "{" {
bracket_count += 1;
blocks.push("".to_string());
continue;
}
if chunk == "}" {
bracket_count -= 1;
if bracket_count < 0 {
return Err(PlurrError::UnmatchedClosingBrace);
}
let block = blocks.pop().unwrap();
let colon_pos_maybe = block.find(':');
let name = if let Some(colon_pos) = colon_pos_maybe {
if self.strict && colon_pos == 0 {
return Err(PlurrError::EmptyPlaceholder);
}
&block[0..colon_pos]
} else {
&block
};
if !self.params.contains_key(name) {
let p_pos = name.find(_PLURAL);
if self.auto_plurals
&& p_pos.is_some()
&& p_pos.unwrap() == name.len() - _PLURAL.len()
{
let prefix = name[0..p_pos.unwrap()].to_string();
if !self.params.contains_key(&prefix) && self.strict {
return Err(PlurrError::UndefinedParameterPairs);
}
let prefix_value_maybe = self.params.get(&prefix).unwrap();
let prefix_value =
if let Ok(parsed_value) = prefix_value_maybe.parse::<usize>() {
parsed_value
} else {
if self.strict {
return Err(PlurrError::NotZeroOrPositiveValue);
}
0
};
self.params.insert(
name.to_owned(),
plurals::plural_func(&self.locale, prefix_value).to_string(),
);
} else if self.strict {
return Err(PlurrError::UndefinedParameter);
}
}
let result = if let Some(colon_pos) = colon_pos_maybe {
let block_len = block.len();
if self.strict && colon_pos == block_len - 1 {
return Err(PlurrError::EmptyVariants);
}
let value = self.params.get(name).unwrap();
let mut choice_idx: usize = value.parse().unwrap_or(0);
let content_start = colon_pos + 1;
let clean_block = &block[content_start..];
let parts: Vec<&str> = clean_block.split('|').collect();
if choice_idx >= parts.len() {
choice_idx = parts.len() - 1;
}
parts[choice_idx]
} else {
self.params.get(name).unwrap()
};
let index = blocks.len() - 1;
blocks[index].push_str(result);
continue;
}
let index = blocks.len() - 1;
blocks[index].push_str(&chunk);
}
if bracket_count > 0 {
return Err(PlurrError::UnmatchedOpeningBrace);
}
self.params.clear();
Ok(blocks[0].clone())
}
}