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use std::fmt;
use std::fs;
use crate::config::*;
use crate::layout::*;
const NUM_BIGRAMS: usize = NUM_KEYS * NUM_KEYS;
pub struct Corpus {
bigram_count: [u32; NUM_BIGRAMS],
character_count: [u32; NUM_KEYS],
total_count: u32,
}
fn pair_to_index(x: char, y: char) -> usize {
let xi = CHAR_TO_INDEX[x as usize];
let yi = CHAR_TO_INDEX[y as usize];
xi + NUM_KEYS * yi
}
impl Corpus {
pub fn load(path: &str) -> Result<Corpus, std::io::Error> {
let contents = fs::read_to_string(path)?;
let mut bigram_count = [0; NUM_BIGRAMS];
let mut character_count = [0; NUM_KEYS];
let mut total_count = 0;
let mut last_char = None;
for c in contents.chars() {
if let Some(c) = canonicalise(c) {
if let Some(lc) = last_char {
// We don't count these anyway
if lc != c {
bigram_count[pair_to_index(c, lc)] += 1;
bigram_count[pair_to_index(lc, c)] += 1;
}
}
last_char = Some(c);
character_count[CHAR_TO_INDEX[c as usize]] += 1;
total_count += 1;
} else {
last_char = None;
}
}
return Ok(Corpus {
bigram_count,
character_count,
total_count,
});
}
pub fn prelayout_fitness(&self, layout: &Prelayout) -> u32 {
let mut sfb: u32 = 0;
for i in 0..6 {
let keys = layout.get_standard_column(i);
let k1 = keys[0];
let k2 = keys[1];
let k3 = keys[2];
sfb += self.bigram_count[pair_to_index(k1, k2)]
+ self.bigram_count[pair_to_index(k1, k3)]
+ self.bigram_count[pair_to_index(k2, k3)];
}
for i in 0..2 {
let keys = layout.get_index_column(i);
let k1 = keys[0];
let k2 = keys[1];
let k3 = keys[2];
let k4 = keys[3];
let k5 = keys[4];
let k6 = keys[5];
sfb += self.bigram_count[pair_to_index(k1, k2)]
+ self.bigram_count[pair_to_index(k1, k3)]
+ self.bigram_count[pair_to_index(k2, k3)]
+ self.bigram_count[pair_to_index(k4, k5)]
+ self.bigram_count[pair_to_index(k4, k6)]
+ self.bigram_count[pair_to_index(k5, k6)]
+ self.bigram_count[pair_to_index(k1, k4)]
+ self.bigram_count[pair_to_index(k1, k5)]
+ self.bigram_count[pair_to_index(k1, k6)]
+ self.bigram_count[pair_to_index(k2, k4)]
+ self.bigram_count[pair_to_index(k2, k5)]
+ self.bigram_count[pair_to_index(k2, k6)]
+ self.bigram_count[pair_to_index(k3, k4)]
+ self.bigram_count[pair_to_index(k3, k5)]
+ self.bigram_count[pair_to_index(k3, k6)];
}
sfb
}
pub fn evaluate_layout(&self, layout: &Layout) -> Evaluation {
let mut keypress: [u32; NUM_KEYS] = [0; NUM_KEYS];
let mut sfb: [u32; 8] = [0; 8];
for (i, &c) in self.character_count.iter().enumerate() {
keypress[layout.translate_index(i)] = c;
}
// TODO: We make assumptions about NUM_KEYS here
for i in 0..8 {
let ind = if i < 4 { i } else { i + 2 };
let k1 = layout.get_key(ind + 10 * 0);
let k2 = layout.get_key(ind + 10 * 1);
let k3 = layout.get_key(ind + 10 * 2);
sfb[i] = self.bigram_count[pair_to_index(k1, k2)]
+ self.bigram_count[pair_to_index(k1, k3)]
+ self.bigram_count[pair_to_index(k2, k3)];
if i == 3 {
let k4 = layout.get_key(4 + 10 * 0);
let k5 = layout.get_key(4 + 10 * 1);
let k6 = layout.get_key(4 + 10 * 2);
sfb[i] += self.bigram_count[pair_to_index(k4, k5)]
+ self.bigram_count[pair_to_index(k4, k6)]
+ self.bigram_count[pair_to_index(k5, k6)]
+ self.bigram_count[pair_to_index(k1, k4)]
+ self.bigram_count[pair_to_index(k1, k5)]
+ self.bigram_count[pair_to_index(k1, k6)]
+ self.bigram_count[pair_to_index(k2, k4)]
+ self.bigram_count[pair_to_index(k2, k5)]
+ self.bigram_count[pair_to_index(k2, k6)]
+ self.bigram_count[pair_to_index(k3, k4)]
+ self.bigram_count[pair_to_index(k3, k5)]
+ self.bigram_count[pair_to_index(k3, k6)];
} else if i == 4 {
let k4 = layout.get_key(5 + 10 * 0);
let k5 = layout.get_key(5 + 10 * 1);
let k6 = layout.get_key(5 + 10 * 2);
sfb[i] += self.bigram_count[pair_to_index(k4, k5)]
+ self.bigram_count[pair_to_index(k5, k6)]
+ self.bigram_count[pair_to_index(k4, k6)]
+ self.bigram_count[pair_to_index(k1, k4)]
+ self.bigram_count[pair_to_index(k1, k5)]
+ self.bigram_count[pair_to_index(k1, k6)]
+ self.bigram_count[pair_to_index(k2, k4)]
+ self.bigram_count[pair_to_index(k2, k5)]
+ self.bigram_count[pair_to_index(k2, k6)]
+ self.bigram_count[pair_to_index(k3, k4)]
+ self.bigram_count[pair_to_index(k3, k5)]
+ self.bigram_count[pair_to_index(k3, k6)];
}
}
return Evaluation::new(keypress, self.total_count, sfb);
}
}
fn dump_bigrams(corpus: &Corpus) -> Vec<(String, u32)> {
let mut result: Vec<(String, u32)> = Vec::new();
for (i, &x) in KEY_CHARS.iter().enumerate() {
for &y in &KEY_CHARS[i..] {
let mut pair = String::from(x);
pair.push(y);
result.push((pair, corpus.bigram_count[pair_to_index(x, y)]));
}
}
result.sort_by(|(_, c1), (_, c2)| c1.cmp(c2).reverse());
return result;
}
impl fmt::Display for Corpus {
fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str(&format!(
"Counted {} characters, top 5 bigrams {:?}",
self.total_count,
&dump_bigrams(self)[0..5]
))
}
}
|
