sec10_wordcount/
lib.rs

1//! libです
2#![warn(missing_docs)]
3use regex::Regex;
4use std::collections::HashMap;
5use std::io::BufRead;
6/**
7count関数です
8 */
9pub fn count(input: impl BufRead, option: CountOption) -> HashMap<String, usize> {
10    let re = Regex::new(r"\w+").unwrap();
11    let mut fregs = HashMap::new();
12    for line in input.lines() {
13        use crate::CountOption::*;
14        let line = line.unwrap();
15        match option {
16            Char => {
17                for c in line.chars() {
18                    *fregs.entry(c.to_string()).or_insert(0) += 1;
19                }
20            },
21            Word => {
22                for m in re.find_iter(&line) {
23                    let word = m.as_str().to_string();
24                    *fregs.entry(word).or_insert(0) += 1;
25                }
26            },
27            Line => {
28                *fregs.entry(line.to_string()).or_insert(0) += 1;
29            }
30        }
31    }
32    fregs
33}
34/// 列挙子です。
35#[derive(Debug,Clone,Copy,PartialEq,Eq,Hash)]
36pub enum CountOption {
37    /// 文字
38    Char,
39    /// 単語
40    Word,
41    /// 行
42    Line,
43}
44impl Default for CountOption {
45    fn default() -> Self {
46        CountOption::Word
47    }
48}
49
50#[test]
51fn word_count_works() {
52    use std::io::Cursor;
53    let mut exp = HashMap::new();
54    exp.insert("aa".to_string(),1);
55    exp.insert("bb".to_string(),2);
56    assert_eq!(count(Cursor::new("aa bb bb"),CountOption::Word),exp);
57}
58
sec10_wordcount/lib.rs

sec10_wordcount/
lib.rs
