From 4b1753cbc332c116b51b3c52cbe144625077d038 Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Thu, 12 Jul 2018 20:17:27 +0300
Subject: Change: use Count methods for clarity

---
 src/main.rs | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 51 insertions(+), 7 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index bed40d9..32ffb18 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -12,6 +12,37 @@ struct Count {
 }
 
 
+impl Count {
+
+    fn new() -> Self {
+        Count {
+            lines: 0,
+            words: 0,
+            chars: 0,
+        }
+    }
+
+    fn add(&mut self, c: &Count) {
+        self.lines += c.lines;
+        self.words += c.words;
+        self.chars += c.chars;
+    }
+
+    fn incr_lines(&mut self) {
+        self.lines += 1;
+    }
+
+    fn incr_words(&mut self, n: usize) {
+        self.words += n;
+    }
+
+    fn incr_chars(&mut self, n: usize) {
+        self.chars += n;
+    }
+
+}
+
+
 fn main() -> Result<(), io::Error> {
     for filename in env::args().skip(1) {
         let mut f = File::open(&filename)?;
@@ -24,32 +55,45 @@ fn main() -> Result<(), io::Error> {
 
 
 fn wc(reader: &mut io::BufReader<File>) -> Result<Count, io::Error> {
-    let mut count = Count {lines: 0, words: 0, chars: 0};
+    let mut count = Count::new();
     for line in reader.lines() {
         let line = line?;
-        count_line(&line, &mut count);
+        count.add(&count_line(&line));
     }
     Ok(count)
 }
 
 
-fn count_line(line: &str, count: &mut Count) {
+fn count_line(line: &str) -> Count{
+    let mut count = Count::new();
+
     // we have a line!
-    count.lines += 1;
+    count.incr_lines();
 
     // add +1 for newline, which we ASSUME is there
-    count.chars += line.chars().count() + 1;
+    count.incr_chars(line.chars().count() + 1);
 
     // count words
-    let mut in_word: bool = false;
+    count.incr_words(count_line_words(line));
+
+    count
+}
+
+
+fn count_line_words(line: &str) -> usize {
+    let mut in_word = false;
+    let mut num_words = 0;
+
     for c in line.chars() {
         if c.is_alphabetic() {
             if !in_word {
                 in_word = true;
-                count.words += 1;
+                num_words += 1;
             }
         } else {
             in_word = false;
         }
     }
+
+    num_words
 }
-- 
cgit v1.2.1