Flesh Out P4 Grammar

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

tree-sitter-p4/test/corpus/parsers.txt

@@ -2,24 +2,34 @@
 Parser (No Parameters)
 =========================
 parser simple() {
-	state testing {}
-}
+  state start {
+    transition accept;
+  }
+};
 
 ---
 (p4program
  (declaration
   (parserDeclaration
-   (parserTypeDeclaration
+   (parserType
     (parser)
-    parser_name: (identifier)
+    (identifier)
    )
    (parserStates
     (parserState
      (state)
      (identifier)
-    )   
+     (parserTransitionStatement
+      (transition)
+      (transitionSelectionExpression
+       (identifier)
+      )
+     )
+     (semicolon)
+    )
    )
   )
+  (semicolon)
  )
 )
 
@@ -28,28 +38,43 @@ parser simple() {
 Parser (Parameters)
 =========================
 parser imple(bool pname) {
-	state testing {}
-}
+  state start {
+    transition accept;
+  }
+};
 
 ---
 (p4program
  (declaration
   (parserDeclaration
-   (parserTypeDeclaration
+   (parserType
     (parser)
     (identifier)
-    (nonEmptyParameterList
+    (parameterList
      (parameter
       (typeRef
        (baseType
-	(bool)))
-      (identifier))))
+        (bool)
+       )
+      )
+      (identifier)
+     )
+    )
+   )
    (parserStates
     (parserState
      (state)
      (identifier)
-    )   
+     (parserTransitionStatement
+      (transition)
+      (transitionSelectionExpression
+       (identifier)
+      )
+     )
+     (semicolon)
+    )
    )
   )
+  (semicolon)
  )
 )