Refactor Library And Start Runtime

Signed-off-by: Will Hawkins <hawkinsw@obs.cr>
2026-01-20 07:10:58 -05:00
parent 45a8baa323
commit 4bec71dcf4
11 changed files with 472 additions and 65 deletions
@@ -0,0 +1,40 @@
+public struct Error {
+    public private(set) var msg: String
+
+    public init(withMessage msg: String) {
+        self.msg = msg
+    }
+}
+
+public enum Result: Equatable {
+    case Ok
+    case Error(Error)
+
+    public static func == (lhs: Result, rhs: Result) -> Bool {
+        switch (lhs, rhs) {
+        case (Ok, Ok):
+            return true
+        case (Error(let le), Error(let re)):
+            return le.msg == re.msg
+        default:
+            return false
+        }
+    }
+}
+
+public struct ParserRuntime {
+    public init() {}
+
+    public func run(program: P4.Parser, input: P4.Packet) -> Result {
+
+        // First, find the start state.
+        guard var start_state = program.findStartState() else {
+            return Result.Error(Error(withMessage: "Could not find the start state"))
+        }
+        var execution = P4.ParserExecution(start_state)
+        while execution.state != P4.accept && execution.state != P4.reject {
+            execution = execution.state.evaluate(execution: execution)
+        }
+        return Result.Ok
+    }
+}