Update Compiler To Use Macros

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

Sources/P4Compiler/Compiler.swift

@@ -0,0 +1,41 @@
+// 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
+import P4Lang
+import P4Runtime
+import SwiftTreeSitter
+import TreeSitterExtensions
+import TreeSitterP4
+
+let p4lang = Language(tree_sitter_p4())
+
+public func ConfigureP4Parser() -> Result<SwiftTreeSitter.Parser> {
+    let p = SwiftTreeSitter.Parser.init()
+
+    do {
+      try p.setLanguage(p4lang)
+    } catch {
+      return Result.Error(Error(withMessage: "Could not configure the P4 parser"))
+    }
+
+  return .Ok(p)
+}
+
+public func ErrorOnNode(node: Node, withError error: String) -> Error {
+  return Error(withMessage: "\(node.range): \(error)")
+}