Refactor Library And Start Runtime

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

Tests/p4lmTests/ParserTests.swift

@@ -0,0 +1,55 @@
+import Testing
+import TreeSitter
+import SwiftTreeSitter
+import TreeSitterP4
+import Foundation
+import P4
+
+@testable import Parser
+
+@Test func test_simple_parser() async throws {
+    let simple_parser_declaration = """
+        parser simple() {
+           state start {
+               transition drop;
+           }
+        }
+        """
+
+    let program = try #require(Parser.Program(simple_parser_declaration))
+
+    #expect(program.parsers.count == 1)
+    #expect(program.parsers[0].states.count == 1)
+    #expect(program.parsers[0].states[0].state_name == "start")
+    #expect(program.parsers[0].states[0].statements.count == 0)
+}
+
+@Test func test_simple_parser_syntax_error() async throws {
+    let simple_parser_declaration = """
+        parser simple() {
+           state
+               transition drop;
+           }
+        }
+        """
+    #expect(Parser.Program(simple_parser_declaration) == nil)
+}
+
+@Test func test_simple_parser_with_statement() async throws {
+    let simple_parser_declaration = """
+        parser simple() {
+           state start {
+               true;
+               transition drop;
+           }
+        }
+        """
+
+    let program = try #require(Parser.Program(simple_parser_declaration))
+
+    #expect(program.parsers.count == 1)
+    #expect(program.parsers[0].states.count == 1)
+    #expect(program.parsers[0].states[0].state_name == "start")
+    #expect(program.parsers[0].states[0].statements.count == 1)
+}
+