day21

TODO.md

@@ -6,6 +6,8 @@ More comments in code! This is getting big enough that I need to re-find my bear
 - [ ] editor - idnent newline on let with no in
 - [x] Move on to next decl in case of error
 - [x] for parse error, seek to col 0 token and process next decl
+- [ ] record initialization sugar, e.g. `{ x := 1, y := 2 }`
+- [ ] record update sugar
 - [ ] Change `Ord` to be more like Idris - LT / EQ / GT (and entail equality)
 - [ ] Keep a `compare` function on `SortedMap` (like lean)
 - [x] keymap for monaco
@@ -14,6 +16,7 @@ More comments in code! This is getting big enough that I need to re-find my bear
 - [x] Matching _,_ when Maybe is expected should be an error
 - [ ] There are issues with matching inside do blocks, I think we need to guess scrutinee? I could imagine constraining metas too (e.g. if Just ... at ?m123 then ?m123 =?= Maybe ?m456)
   - Also, the root cause is tough to track down if there is a type error (this happens with `do` in Idris, too).
+  - Part of it is the auto solutions are getting discarded because of an unrelated unification failure. Either auto shouldn't go as deep or should run earlier. Forgetting that lookupMap returns a (k,v) pair is a good example.
 - [ ] error for non-linear pattern
 - [ ] typeclass dependencies
   - need to flag internal functions to not search (or flag functions for search). I need to decide on syntax for this.

aoc2024/Day21.newt

@@ -0,0 +1,143 @@
+module Day21
+
+import Prelude
+import Node
+import Aoc
+import SortedMap
+import Parser
+
+min : Int → Int → Int
+min a b = if a < b then a else b
+
+gridPoints : String → List (Char × Int × Int)
+gridPoints text = go 0 0 (unpack text) Nil
+  where
+    -- might as well be tail recursive
+    go : Int → Int → List Char → List (Char × Int × Int) → List (Char × Int × Int)
+    go row col Nil points = points
+    go row col ('\n' :: cs) points = go (row + 1) 0 cs points
+    go row col (c :: cs) points = go row (col + 1) cs ((c,row,col) :: points)
+
+data Dir : U where North East South West : Dir
+
+dirs : List Dir
+dirs = (North :: South :: East :: West :: Nil)
+
+move : Point → Dir → Point
+move (r, c) North  = (r - 1, c)
+move (r, c) East   = (r, c + 1)
+move (r, c) South  = (r + 1, c)
+move (r, c) West   = (r, c - 1)
+
+Costs : U
+Costs = SortedMap (Point × Point) Int
+
+-- linked list of keypads
+record Keypad where
+  constructor KP
+  name : String
+  start : Point
+  interdit : Point
+  costs : Costs -- cache of costs
+  next : Maybe Keypad
+
+getPaths : Point → Point → Point → List (List Dir)
+getPaths interdit pt@(a,b) to@(c,d) =
+  if pt == to then Nil :: Nil else
+  if pt == interdit then Nil else
+  join $ map check dirs
+  where
+    check : Dir → List (List Dir)
+    check North = if c < a then map (_::_ North) $ getPaths interdit (move pt North) (c,d) else Nil
+    check South = if a < c then map (_::_ South) $ getPaths interdit (move pt South) (c,d) else Nil
+    check East = if b < d then map (_::_ East) $ getPaths interdit (move pt East) (c,d) else Nil
+    check West = if d < b then map (_::_ West) $ getPaths interdit (move pt West) (c,d) else Nil
+
+updateCost : Point × Point → Int → Keypad → Keypad
+updateCost path cost (KP n s i c nxt) = (KP n s i (updateMap path cost c) nxt)
+
+keyPos : Dir → Point
+keyPos North = (0,1)
+keyPos South = (1,1)
+keyPos East  = (1,2)
+keyPos West  = (1,0)
+
+-- cost to run a path in a keypad
+pathCost : Point → Point → Keypad → Keypad × Int
+
+-- cost of sequence of points (run in parent keypad)
+-- for numpad, we pick points from the map, for the rest map keyPos ...
+seqCost : Point → List Point → Keypad × Int → Keypad × Int
+seqCost cur Nil (kp, cost) = (kp, cost)
+seqCost cur (pt :: pts) (kp, cost) =
+  let (kp, cost') = pathCost cur pt kp in
+  let x = cost' in
+  seqCost pt pts (kp, cost + cost')
+
+-- cost of best path from -> to in kp
+pathCost from to kp = do
+  case lookupMap (from, to) (costs kp) of
+    Just (_, cost) => (kp, cost)
+    Nothing =>
+      let (path :: paths) = getPaths (interdit kp) from to | _ => ? in
+      case kp of
+        (KP n s i c Nothing) => (kp, 1)
+        (KP n s i c (Just kp')) =>
+          let (kp', cost) = mincost path paths kp' in
+          let kp = KP n s i c (Just kp') in
+          (updateCost (from,to) cost kp, cost)
+  where
+    xlate : List Dir → Point -> List Point
+    xlate Nil a = a :: Nil
+    xlate (d :: ds) a = keyPos d :: xlate ds a
+
+    mincost : List Dir → List (List Dir) → Keypad → Keypad × Int
+    mincost path paths kp =
+      let (kp', cost) = seqCost (0,2) (xlate path $ start kp) (kp, 0) in
+      case paths of
+        Nil => (kp', cost)
+        (path :: paths) => let (kp', cost') = mincost path paths kp' in (kp', min cost cost')
+
+fromList : ∀ k v. {{Ord k}} {{Eq k}} → List (k × v) → SortedMap k v
+fromList xs = foldMap (\ a b => b) EmptyMap xs
+
+getNum : String → Int
+getNum str = case number (unpack str) of
+  Right (n, _) => n
+  _ => 0
+
+runOne : Keypad → SortedMap Char Point → String → Int × Int
+runOne kp numpad str =
+  let pts = map snd $ mapMaybe (flip lookupMap numpad) $ unpack str in
+  let res = seqCost (3,2) pts (kp, 0) in
+  (getNum str, snd res)
+
+makeKeypad : Int → Keypad -> Keypad
+makeKeypad 0 kp = kp
+makeKeypad n kp = makeKeypad (n - 1) $ KP (show n) (0,2) (0,0) EmptyMap (Just kp)
+
+run : String -> IO Unit
+run fn = do
+  putStrLn fn
+  text <- readFile fn
+  let codes = split (trim text) "\n"
+
+  -- the space is illegal spot
+  let numpad = fromList $ filter (not ∘ _==_ ' ' ∘ fst) $ gridPoints "789\n456\n123\n 0A"
+
+  let rob1 = KP "r1" (0,2) (0,0) EmptyMap Nothing
+  let robn = makeKeypad 2 rob1
+  let kp = KP "kp" (3,2) (3,0) EmptyMap (Just robn)
+  let p1 = foldl _+_ 0 $ map (uncurry _*_ ∘ runOne kp numpad) codes
+  putStrLn $ "part1 " ++ show p1
+
+  let rob1 = KP "r1" (0,2) (0,0) EmptyMap Nothing
+  let robn = makeKeypad 25 rob1
+  let kp = KP "kp" (3,2) (3,0) EmptyMap (Just robn)
+  let p2 = foldl _+_ 0 $ map (uncurry _*_ ∘ runOne kp numpad) codes
+  putStrLn $ "part2 " ++ show p2
+
+main : IO Unit
+main = do
+  run "aoc2024/day21/eg.txt"
+  run "aoc2024/day21/input.txt"

aoc2024/day21/eg.txt

@@ -0,0 +1,5 @@
+029A
+980A
+179A
+456A
+379A

newt-vscode/.eslintrc.json

@@ -17,7 +17,7 @@
             }
         ],
         "@typescript-eslint/semi": "warn",
-        "curly": "warn",
+        "curly": ["warn", "multi"],
         "eqeqeq": "warn",
         "no-throw-literal": "warn",
         "semi": "off"

newt-vscode/src/extension.ts

@@ -37,9 +37,9 @@ export function activate(context: vscode.ExtensionContext) {
       { cwd, maxBuffer: 1024 * 1024 * 10 },
       (err, stdout, _stderr) => {
         // I think I ignored 1 here because I wanted failure to launch
-        if (err && err.code !== 1) {
+        if (err && err.code !== 1)
           vscode.window.showErrorMessage(`newt error: ${err}`);
-        }
+
 
         // extract errors and messages from stdout
         const lines = stdout.split("\n");
@@ -79,9 +79,9 @@ export function activate(context: vscode.ExtensionContext) {
 
             let lnum = Number(line);
             let cnum = Number(column);
-            if (file !== fileName) {
+            if (file !== fileName)
               lnum = cnum = 0;
-            }
+
             let start = new vscode.Position(lnum, cnum);
             // we don't have the full range, so grab the surrounding word
             let end = new vscode.Position(lnum, cnum + 1);
@@ -92,17 +92,17 @@ export function activate(context: vscode.ExtensionContext) {
             // anything indented
             // Context:, or Goal: are part of PRINTME
             // unexpected / expecting appear in parse errors
-            while (lines[i + 1]?.match(/^(  )/)) {
+            while (lines[i + 1]?.match(/^(  )/))
               message += "\n" + lines[++i];
-            }
+
             const severity =
               kind === "ERROR"
                 ? vscode.DiagnosticSeverity.Error
                 : vscode.DiagnosticSeverity.Information;
             const diag = new vscode.Diagnostic(range, message, severity);
-            if (kind === "ERROR" || lnum > 0) {
+            if (kind === "ERROR" || lnum > 0)
               diagnostics.push(diag);
-            }
+
           }
         }
         diagnosticCollection.set(vscode.Uri.file(fileName), diagnostics);
@@ -116,9 +116,9 @@ export function activate(context: vscode.ExtensionContext) {
       const editor = vscode.window.activeTextEditor;
       if (editor) {
         const document = editor.document;
-        if (document.fileName.endsWith(".newt")) {
+        if (document.fileName.endsWith(".newt"))
           checkDocument(document);
-        }
+
       }
     }
   );
@@ -164,25 +164,25 @@ export function activate(context: vscode.ExtensionContext) {
         }
       }
     )
-  )
+  );
 
   context.subscriptions.push(runPiForall);
 
   vscode.workspace.onDidSaveTextDocument((document) => {
-    if (document.fileName.endsWith(".newt")) {
+    if (document.fileName.endsWith(".newt"))
       vscode.commands.executeCommand("newt-vscode.check");
-    }
+
   });
   vscode.workspace.onDidOpenTextDocument((document) => {
-    if (document.fileName.endsWith(".newt")) {
+    if (document.fileName.endsWith(".newt"))
       vscode.commands.executeCommand("newt-vscode.check");
-    }
+
   });
-  for (let document of vscode.workspace.textDocuments) {
+  for (let document of vscode.workspace.textDocuments)
-    if (document.fileName.endsWith(".newt")) {
+    if (document.fileName.endsWith(".newt"))
       checkDocument(document);
-    }
+
-  }
+
   context.subscriptions.push(diagnosticCollection);
 }
 

newt-vscode/syntaxes/newt.tmLanguage.json

@@ -16,7 +16,7 @@
     },
     {
       "name": "keyword.newt",
-      "match": "\\b(λ|=>|<-|->|→|:=|\\$|data|where|do|class|uses|instance|case|of|let|if|then|else|forall|∀|in|U|module|import|ptype|pfunc|infix|infixl|infixr)\\b"
+      "match": "\\b(λ|=>|<-|->|→|:=|\\$|data|record|where|do|class|uses|instance|case|of|let|if|then|else|forall|∀|in|U|module|import|ptype|pfunc|infix|infixl|infixr)\\b"
     },
     {
       "name": "string.js",

playground/samples/aoc2024/Day21.newt

@@ -0,0 +1 @@
+../../../aoc2024/Day21.newt

playground/samples/aoc2024/day21

@@ -0,0 +1 @@
+../../../aoc2024/day21

playground/src/monarch.ts

@@ -68,6 +68,7 @@ export let newtTokens: monaco.languages.IMonarchLanguage = {
     "in",
     "where",
     "case",
+    "record",
     "of",
     "data",
     "forall",