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use std::env;
use std::fs::File;
use std::io;
use std::io::BufRead;
use std::collections::HashMap;
fn main() -> io::Result<()> {
for filename in env::args().skip(1) {
let mut f = File::open(&filename)?;
let mut reader = io::BufReader::new(f);
print_words(&mut reader)?;
}
Ok(())
}
fn print_words(reader: &mut io::BufReader<File>) -> io::Result<()> {
for line in reader.lines() {
let line = line?;
count_words_in_line(&line);
}
Ok(())
}
fn count_words_in_line(line: &str) {
let mut words = WordCounts::new();
let mut word = String::new();
for c in line.chars() {
if c.is_alphabetic() {
word.push(c);
} else {
if !word.is_empty() {
words.count(word.clone());
word.clear();
}
}
}
if !word.is_empty() {
words.count(word.clone());
}
words.print();
}
struct WordCounts {
counts: HashMap<String, u32>,
}
impl WordCounts {
fn new() -> Self {
WordCounts {
counts: HashMap::new(),
}
}
fn count(&mut self, word: String) {
let counter = self.counts.entry(word).or_insert(0);
*counter += 1;
}
fn print(&self) {
for (word, count) in self.counts.iter() {
println!("{} {}", count, word);
}
}
}
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