From 15a42ef20c2fdfb5fe68ea348579b32b1f48f742 Mon Sep 17 00:00:00 2001
From: Michael Peters <michael@styx>
Date: Tue, 12 Mar 2024 16:10:56 -0700
Subject: [PATCH] parse and apply moves

---
 src/main.rs | 97 ++++++++++++++++++++---------------------------------
 1 file changed, 37 insertions(+), 60 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 59c210b..163ea42 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -119,7 +119,6 @@ impl FromStr for Move {
     type Err = &'static str;
 
     fn from_str(s: &str) -> Result<Self, Self::Err> {
-        println!("\"{}\"", s);
         match s {
             "U" => Ok(Move::U),
             "U2" => Ok(Move::U2),
@@ -144,26 +143,19 @@ impl FromStr for Move {
     }
 }
 
-fn parse_moves(s: &str) -> Result<Vec<Move>, &'static str> {
+fn parse_moves(moves_str: &str) -> Result<Vec<Move>, &'static str> {
     let mut moves = Vec::new();
-    let mut chars = s.chars().filter(|&c| c != ' ').peekable();
+    let mut chars = moves_str.chars().filter(|&c| c != ' ').peekable();
 
     while let Some(c) = chars.next() {
         let nco = chars.peek();
         match nco {
-            Some(nc) => match nc {
-                '2' | '\'' => {
-                    let s = format!("{}{}", c, nc);
-                    let m = Move::from_str(s.as_str()).expect("unable to parse move");
-                    moves.push(m);
-                    chars.next();
-                }
-                _ => {
-                    let s = c.to_string();
-                    let m = Move::from_str(s.as_str()).expect("unable to parse move");
-                    moves.push(m);
-                }
-            },
+            Some(nc) if (nc == &'2' || nc == &'\'') => {
+                let s = format!("{}{}", c, nc);
+                let m = Move::from_str(s.as_str()).expect("unable to parse move");
+                moves.push(m);
+                chars.next();
+            }
             _ => {
                 let s = c.to_string();
                 let m = Move::from_str(s.as_str()).expect("unable to parse move");
@@ -175,6 +167,32 @@ fn parse_moves(s: &str) -> Result<Vec<Move>, &'static str> {
     Ok(moves)
 }
 
+#[rustfmt::skip]
+fn apply_moves(c: &mut Cube, moves: Vec<Move>) {
+    for m in moves {
+        match m {
+            Move::U  => { c.u(); },
+            Move::U2 => { c.u(); c.u(); },
+            Move::Up => { c.u(); c.u(); c.u(); },
+            Move::D  => { c.d(); },
+            Move::D2 => { c.d(); c.d(); },
+            Move::Dp => { c.d(); c.d(); c.d(); },
+            Move::L  => { c.l(); },
+            Move::L2 => { c.l(); c.l(); },
+            Move::Lp => { c.l(); c.l(); c.l(); },
+            Move::R  => { c.r(); },
+            Move::R2 => { c.r(); c.r(); }
+            Move::Rp => { c.r(); c.r(); c.r(); }
+            Move::F  => { c.f(); },
+            Move::F2 => { c.f(); c.f(); }
+            Move::Fp => { c.f(); c.f(); c.f(); }
+            Move::B  => { c.b(); },
+            Move::B2 => { c.b(); c.b(); }
+            Move::Bp => { c.b(); c.b(); c.b(); }
+        }
+    }
+}
+
 struct Cube {
     u: Face,
     d: Face,
@@ -272,55 +290,14 @@ impl Cube {
         self.l.apply_l(u_tr, u_tm, u_tl);
     }
 
-    // TODO: efficient counter-clockwise
-    fn up(&mut self) {
-        self.u();
-        self.u();
-        self.u();
-    }
-
-    fn dp(&mut self) {
-        self.d();
-        self.d();
-        self.d();
-    }
-
-    fn lp(&mut self) {
-        self.l();
-        self.l();
-        self.l();
-    }
-
-    fn rp(&mut self) {
-        self.r();
-        self.r();
-        self.r();
-    }
-
-    fn fp(&mut self) {
-        self.f();
-        self.f();
-        self.f();
-    }
-
-    fn bp(&mut self) {
-        self.b();
-        self.b();
-        self.b();
-    }
+    // TODO: efficient double / counter-clockwise
 }
 
 fn main() {
     let mut c = Cube::new();
     println!("Here's the cube:\n{}", c);
-    c.r();
-    c.u();
-    c.rp();
-    c.u();
-    c.r();
-    c.u();
-    c.u();
-    c.rp();
+    let moves = parse_moves("R U R' U R U2 R'").expect("unable to parse moves");
+    apply_moves(&mut c, moves);
     println!("after OLL:\n{}", c);
 }