Valentin Brandl 6d9895a152
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Update intro-crypto u1
2018-10-23 15:07:50 +02:00

131 lines
3.8 KiB
Rust

extern crate countmap;
use countmap::CountMap;
use std::{
collections::HashMap,
fs::File,
io::{self, BufRead, BufReader},
path::Path,
};
fn analyze_text<P: AsRef<Path>>(p: P) -> io::Result<CountMap<char, u32>> {
let mut map = CountMap::new();
let read = BufReader::new(File::open(p)?);
read.lines()
.filter(Result::is_ok)
.map(Result::unwrap)
.for_each(|l| {
l.chars().filter(|c| c.is_alphabetic()).for_each(|c| {
map.insert_or_increment(dumb_to_lowercase(c));
});
});
Ok(map)
}
fn create_mapping_table<I1, I2>(natural: I1, target: I2) -> HashMap<char, char>
where
I1: IntoIterator<Item = (char, u32)>,
I2: IntoIterator<Item = (char, u32)>,
{
let mut natural: Vec<_> = natural.into_iter().collect();
natural.sort_by(|(_, u1), (_, u2)| u2.cmp(u1));
let mut target: Vec<_> = target.into_iter().collect();
target.sort_by(|(_, u1), (_, u2)| u2.cmp(u1));
natural
.into_iter()
.zip(target.into_iter())
.map(|((c1, _), (c2, _))| (c1, c2))
.collect()
}
fn auto_decrypt<P1, P2>(natural: P1, target: P2) -> io::Result<String>
where
P1: AsRef<Path>,
P2: AsRef<Path>,
{
let natural_map = analyze_text(natural)?;
let target_map = analyze_text(&target)?;
let mapping = create_mapping_table(natural_map, target_map);
let read = BufReader::new(File::open(target)?);
let res: Vec<_> = read
.lines()
.filter(Result::is_ok)
.map(Result::unwrap)
.map(|l| {
l.chars()
.map(|c| mapping.get(&dumb_to_lowercase(c)).cloned().unwrap_or(c))
.collect::<String>()
}).collect();
Ok(res.as_slice().join("\n").to_owned())
}
fn count() {
let args: Vec<_> = std::env::args().collect();
let file = &args[1];
let mut map: CountMap<char, u32> = CountMap::new();
let read = BufReader::new(File::open(file).unwrap());
for line in read.lines() {
if let Ok(line) = line {
line.chars().filter(|c| c.is_alphabetic()).for_each(|c| {
map.insert_or_increment(c);
});
}
}
let sum: u32 = map
.iter()
.filter(|(k, _)| k.is_alphabetic())
.map(|(_, v)| v)
.sum();
let mut vec: Vec<_> = map.into_iter().collect();
vec.sort_unstable();
vec.into_iter().for_each(|(k, v)| {
println!(
"{} &\\text{{:}}& {:3} \\to{{}} {:.2} \\\\",
k,
v,
f64::from(v) / f64::from(sum)
)
});
println!("sum &\\text{{:}}& {}", sum);
}
fn dumb_to_lowercase(c: char) -> char {
c.to_lowercase().to_string().chars().nth(0).unwrap_or(c)
}
fn create_map<P: AsRef<Path>>(path: P) -> std::io::Result<HashMap<char, char>> {
let read = BufReader::new(File::open(path)?);
let mut map = HashMap::new();
for line in read.lines() {
if let Ok(line) = line {
let chars: Vec<char> = line.chars().collect();
if chars.len() != 2 {
eprintln!("Invalid line {}", line);
} else {
map.insert(chars[0], chars[1]);
}
}
}
Ok(map)
}
fn main() {
let args: Vec<_> = std::env::args().collect();
let res = auto_decrypt(&args[1], &args[2]).unwrap();
println!("{}", res);
// count();
// let args: Vec<_> = std::env::args().collect();
// let target = &args[1];
// let map = create_map(&args[2]).unwrap();
// let read = BufReader::new(File::open(target).unwrap());
// for line in read.lines() {
// if let Ok(line) = line {
// let s: String = line
// .chars()
// .map(|c| map.get(&c).cloned().unwrap_or(c))
// .collect();
// println!("{}", s);
// }
// }
}