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use cached::proc_macro::cached;
use log::{log_enabled, trace};
use ordered_float::OrderedFloat;
pub(crate) mod plugins;
pub(crate) mod structs;
use plugins::{
ArchaicUpperLowerPlugin, CjkInvalidStopPlugin, MessDetectorPlugin, SuperWeirdWordPlugin,
SuspiciousDuplicateAccentPlugin, SuspiciousRangePlugin, TooManyAccentuatedPlugin,
TooManySymbolOrPunctuationPlugin, UnprintablePlugin,
};
use structs::MessDetectorChar;
//
// Mess detection module
//
// Compute a mess ratio given a decoded bytes sequence. The maximum threshold does stop the computation earlier.
#[cached(size = 2048)]
pub(crate) fn mess_ratio(
decoded_sequence: String,
maximum_threshold: Option<OrderedFloat<f32>>,
) -> f32 {
let maximum_threshold = f32::from(maximum_threshold.unwrap_or(OrderedFloat(0.2)));
let mut detectors: Vec<Box<dyn MessDetectorPlugin>> = vec![
Box::<TooManySymbolOrPunctuationPlugin>::default(),
Box::<TooManyAccentuatedPlugin>::default(),
Box::<UnprintablePlugin>::default(),
Box::<SuspiciousRangePlugin>::default(),
Box::<SuspiciousDuplicateAccentPlugin>::default(),
Box::<SuperWeirdWordPlugin>::default(),
Box::<CjkInvalidStopPlugin>::default(),
Box::<ArchaicUpperLowerPlugin>::default(),
];
let mut mean_mess_ratio: Option<f32> = None;
let early_calc_period: usize = match decoded_sequence.chars().count() {
..=510 => 32,
511..=1023 => 64,
_ => 128,
};
// Traverse through chars and detectors
for (index, ch) in decoded_sequence
.chars()
.chain(std::iter::once('\n'))
.enumerate()
{
let mess_char = MessDetectorChar::new(ch);
detectors
.iter_mut()
.filter(|detector| detector.eligible(&mess_char))
.for_each(|detector| detector.feed(&mess_char));
if index % early_calc_period == early_calc_period - 1 {
let early_mess_ratio: f32 = detectors.iter().map(|x| x.ratio()).sum();
if early_mess_ratio >= maximum_threshold {
mean_mess_ratio = Some(early_mess_ratio);
break;
}
}
}
let return_ratio = mean_mess_ratio.unwrap_or(detectors.iter().map(|x| x.ratio()).sum());
if log_enabled!(log::Level::Trace) {
trace!(
"Mess-detector extended-analysis start: early_calc_period={}, mean_mess_ratio={}, maximum_threshold={} \
{}",
early_calc_period,
return_ratio,
maximum_threshold,
detectors
.iter()
.filter(|d| d.ratio() > 0.0)
.map(|d| format!("{} produces ratio: {}", d.name(), d.ratio()))
.collect::<Vec<String>>()
.join("===")
);
}
return_ratio
}
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