Flesh Out P4 Grammar

Signed-off-by: Will Hawkins <hawkinsw@obs.cr>
2026-01-17 00:02:43 -05:00
parent 08beba6cb1
commit c78afa5418
5 changed files with 360 additions and 33 deletions
@@ -0,0 +1,88 @@
+=========================
+Simple Transition Statement (To Identifier)
+=========================
+parser simple() {
+  state start {
+    transition accept;
+  }
+};
+
+---
+(p4program
+ (declaration
+  (parserDeclaration
+   (parserType
+    (parser)
+    (identifier)
+   )
+   (parserStates
+    (parserState
+     (state)
+     (identifier)
+     (parserTransitionStatement
+      (transition)
+      (transitionSelectionExpression
+       (identifier)
+      )
+     )
+     (semicolon)
+    )
+   )
+  )
+  (semicolon)
+ )
+)
+
+=========================
+Simple Transition Statement (To Select Expression)
+=========================
+parser simple() {
+  state start {
+    transition select (se) {
+      true: next_state;
+    };
+  }
+};
+
+---
+(p4program
+ (declaration
+  (parserDeclaration
+   (parserType
+    (parser)
+    (identifier)
+   )
+   (parserStates
+    (parserState
+     (state)
+     (identifier)
+     (parserTransitionStatement
+      (transition)
+      (transitionSelectionExpression
+       (selectExpression
+        (select)
+        (expression
+         (identifier)
+        )
+        (selectBody
+         (selectCase
+          (keysetExpression
+           (expression
+            (true)
+           )
+          )
+          (colon)
+          (identifier)
+         )
+         (semicolon)
+        )
+       )
+      )
+     )
+     (semicolon)
+    )
+   )
+  )
+  (semicolon)
+ )
+)