1 files changed, 55 insertions, 0 deletions
diff --git a/web/pw-server/src/lib/log_parser.ts b/web/pw-server/src/lib/log_parser.ts
new file mode 100644
index 0000000..77c459f
--- /dev/null
+++ b/web/pw-server/src/lib/log_parser.ts
@@ -0,0 +1,55 @@
+export type PlayerLog = PlayerLogTurn[];
+
+export type PlayerLogTurn = {
+  action?: PlayerAction;
+  stderr: string[];
+};
+
+type PlayerAction = BadCommand;
+
+type BadCommand = {
+  type: "bad_command";
+  command: string;
+  error: string;
+};
+
+function createEmptyLogTurn(): PlayerLogTurn {
+  return {
+    stderr: [],
+  };
+}
+
+export function parsePlayerLog(playerId: number, logText: string): PlayerLog {
+  const logLines = logText.split("\n").slice(0, -1);
+
+  const playerLog: PlayerLog = [];
+
+  let turn = null;
+
+  logLines.forEach((logLine) => {
+    const logMessage = JSON.parse(logLine);
+
+    if (logMessage["type"] === "gamestate") {
+      if (turn) {
+        playerLog.push(turn);
+        turn = createEmptyLogTurn();
+      }
+    } else if (logMessage["player_id"] === playerId) {
+      if (!turn) {
+        // older match logs don't have an initial game state due to a bug.
+        turn = createEmptyLogTurn();
+      }
+      switch (logMessage["type"]) {
+        case "stderr": {
+          let msg = logMessage["message"];
+          turn.stderr.push(msg);
+        }
+        case "bad_command": {
+          turn.action = logMessage;
+        }
+      }
+    }
+  });
+
+  return playerLog;
+}