Add matching mechanism

src/engine.rs

@@ -12,7 +12,7 @@ impl <'a> Engine<'a> {
 }
 
 impl <'a> MatchReceiver for Engine<'a>{
-    fn on_match(&self, m: Match) {
+    fn on_match(&self, m: &Match) {
         self.sender.delete_string(m.trigger.len() as i32);
         self.sender.send_string(m.result.as_str());
     }

src/main.rs

@@ -1,6 +1,7 @@
 use std::sync::mpsc;
 use crate::keyboard::KeyboardInterceptor;
 use crate::matcher::Matcher;
+use crate::matcher::Match;
 use crate::matcher::scrolling::ScrollingMatcher;
 use crate::engine::Engine;
 
@@ -21,6 +22,8 @@ fn main() {
 
     let engine = Engine::new(&sender);
 
-    let matcher = ScrollingMatcher::new(&engine);
+    let matches = vec![Match{trigger:"e'".to_owned(), result: "è".to_owned()}, Match{trigger:":lol".to_owned(), result: "😂".to_owned()}];
+
+    let mut matcher = ScrollingMatcher::new(&matches, &engine);
     matcher.watch(&rxc);
 }

src/matcher/mod.rs

@@ -8,12 +8,12 @@ pub struct Match {
 }
 
 pub trait MatchReceiver {
-    fn on_match(&self, m: Match);
+    fn on_match(&self, m: &Match);
 }
 
 pub trait Matcher {
-    fn handle_char(&self, c: char);
-    fn watch(&self, receiver: &Receiver<char>) {
+    fn handle_char(&mut self, c: char);
+    fn watch(&mut self, receiver: &Receiver<char>) {
         loop {
             match receiver.recv() {
                 Ok(c) => {

src/matcher/scrolling.rs

@@ -1,21 +1,52 @@
 use crate::matcher::{Match, MatchReceiver};
 
 pub struct ScrollingMatcher<'a>{
-    receiver: &'a MatchReceiver
+    matches: &'a Vec<Match>,
+    receiver: &'a MatchReceiver,
+    current_set: Vec<MatchEntry<'a>>
+}
+
+struct MatchEntry<'a> {
+    remaining: &'a str,
+    _match: &'a Match
 }
 
 impl <'a> super::Matcher for ScrollingMatcher<'a> {
-    fn handle_char(&self, c: char) {
-        println!("Scroll {}",c);
+    fn handle_char(&mut self, c: char) {
+        let mut new_matches: Vec<MatchEntry> = self.matches.iter()
+            .filter(|&x| x.trigger.chars().nth(0).unwrap() == c)
+            .map(|x | MatchEntry{remaining: &x.trigger[1..], _match: &x})
+            .collect();
+        // TODO: use an associative structure to improve the efficiency of this first "new_matches" lookup.
 
-        if c == 'a' {
-            self.receiver.on_match(Match{trigger: "a".to_owned(), result: "ciao".to_owned()});
+        let old_matches = self.current_set.iter()
+            .filter(|&x| x.remaining.chars().nth(0).unwrap() == c)
+            .map(|x | MatchEntry{remaining: &x.remaining[1..], _match: &x._match})
+            .collect();
+
+        self.current_set = old_matches;
+        self.current_set.append(&mut new_matches);
+
+        let mut found = false;
+        let mut foundMatch = None;
+
+        for entry in self.current_set.iter_mut() {
+            if entry.remaining.len() == 0 {
+                foundMatch = Some(entry._match);
+                break;
+            }
+        }
+
+        if let Some(_match) = foundMatch {
+            self.current_set.clear();
+            self.receiver.on_match(_match);
         }
     }
 }
 
 impl <'a> ScrollingMatcher<'a> {
-    pub fn new(receiver: &'a MatchReceiver) -> ScrollingMatcher<'a> {
-        ScrollingMatcher{ receiver }
+    pub fn new(matches:&'a Vec<Match>, receiver: &'a MatchReceiver) -> ScrollingMatcher<'a> {
+        let current_set = Vec::new();
+        ScrollingMatcher{ matches, receiver, current_set }
     }
 }