Refactor Type System

Signed-off-by: Will Hawkins <hawkinsw@obs.cr>

Sources/Lang/Instantiation.swift

@@ -0,0 +1,22 @@
+// p4rse, Copyright 2026, Will Hawkins
+//
+// This file is part of p4rse.
+//
+// This file is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import Common
+
+public struct Instantiation {
+
+}

Sources/Lang/Parser.swift

@@ -85,13 +85,21 @@ public struct ParserStates {
 nonisolated(unsafe) public let accept: ParserState = ParserState(name: "accept")
 nonisolated(unsafe) public let reject: ParserState = ParserState(name: "reject")
 
-public struct Parser {
+public struct Parser: P4Type {
   public var states: [ParserState] = Array()
   public var count: Int {
     states.count
   }
 
-  public init() {}
+  public var name: Identifier
+
+  public init(withName name: Identifier) {
+    self.name = name
+  }
+
+  public static func create() -> any P4Type {
+    return Parser(withName: Identifier(name: ""))
+  }
 
   public func findStartState() -> ParserState? {
     for state in states {
@@ -103,25 +111,25 @@ public struct Parser {
   }
 }
 
-public class ParserExecution: ProgramExecution {
+public class ParserInstance: ProgramExecution {
 
     private init(state: ParserState) {
       self.state = state
       super.init()
     }
 
-    public static func create(_ parser: Parser) -> Result<ParserExecution> {
+    public static func create(_ parser: Parser) -> Result<ParserInstance> {
         guard let start_state = parser.findStartState() else {
             return Result.Error(Error(withMessage: "Could not find the start state"))
         }
-        let new = ParserExecution(state: start_state)
+        let new = ParserInstance(state: start_state)
 
         return Result.Ok(new)
     }
 
     public var state: ParserState
 
-    public func transition(toNextState state: ParserState) -> ParserExecution {
+    public func transition(toNextState state: ParserState) -> ParserInstance {
         let next = self
         next.state = state
         return next

Sources/Lang/Program.swift

@@ -15,7 +15,30 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
+import Common
+
 public struct Program {
-    public var parsers: [Parser] = Array()
+    public var types: [P4Type] = Array()
+
+    /// Find the program's main parser
+    /// 
+    /// Note: For now, the main parser is expected to be named main_parser.
+    public func starting_parser() -> Result<Parser> {
+        return self.find_parser(withName: Identifier(name: "main_parser"))
+    }
+
+    public func find_parser(withName name: Identifier) -> Result<Parser> {
+        for type in self.types {
+            print("type: \(type)")
+            guard let parser = type as? Parser else {
+                continue
+            }
+            if parser.name == name {
+                return .Ok(parser)
+            }
+        }
+        return .Error(Error(withMessage: "Could not find parser named \(name)"))
+    }
+
     public init() {}
 }