Refactor Parsers and Parser States

Signed-off-by: Will Hawkins <hawkinsw@obs.cr>
2026-03-10 03:56:18 -04:00
parent 7c7416fa64
commit 3188b52965
12 changed files with 223 additions and 381 deletions
@@ -0,0 +1,59 @@
+// 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 KeysetExpression {
+  public let key: EvaluatableExpression
+  public let next_state_identifier: Identifier
+  public let next_state: ParserState?
+
+  public init(withKey key: EvaluatableExpression, withNextState next_state_id: Identifier) {
+    self.key = key
+    self.next_state_identifier = next_state_id
+    self.next_state = .none
+  }
+  public init(
+    withKey key: EvaluatableExpression, withNextState next_state_id: Identifier,
+    withNextState next_state: ParserState
+  ) {
+    self.key = key
+    self.next_state_identifier = next_state_id
+    self.next_state = next_state
+  }
+
+}
+
+public struct SelectExpression {
+  public let selector: EvaluatableExpression
+  public let keyset_expressions: [KeysetExpression]
+
+  public init(
+    withSelector selector: EvaluatableExpression, withKeysetExpressions kses: [KeysetExpression]
+  ) {
+    self.selector = selector
+    self.keyset_expressions = kses
+  }
+
+  public func append_checked_kse(kse: KeysetExpression) -> SelectExpression {
+    var new_kse = self.keyset_expressions
+    new_kse.append(kse)
+    return SelectExpression(
+      withSelector: self.selector, withKeysetExpressions: new_kse)
+  }
+}
+