=========================
Return Statement
=========================
int fun() {
  return 1;
};
---
(p4program
 (declaration
  (function_declaration
   (typeRef
    (baseType
     (int)
    )
   )
   (identifier)
   (parameters)
   (statement
    (blockStatement
     (statements
      (statement
       (return_statement
        (expression
         (simple_expression
          (integer)
         )
        )
       )
      )
     )
    )
   )
  )
 )
)
=========================
Simple If Statement (No Else)
=========================
parser simple() {
  state start {
    if (true) {
    }
    transition accept;
  }
};

---
(p4program
 (declaration
  (parserDeclaration
   (parserType
    (parser)
    (identifier)
    (parameters)
   )
   (parserStates
    (parserState
     (state)
     (identifier)
     (parserStatements
      (parserStatement
       (conditionalStatement
        (if)
        (expression
         (simple_expression
          (booleanLiteralExpression
           (true)
          )
         )
        )
        (statement
         (blockStatement)
        )
       )
      )
     )
     (parserTransitionStatement
      (transition)
      (transitionSelectionExpression
       (identifier)
      )
     )
    )
   )
  )
 )
)

=========================
Simple If Statement (Else)
=========================
parser simple() {
  state start {
    if (true) {
    } else {
    }
    transition accept;
  }
};

---
(p4program
 (declaration
  (parserDeclaration
   (parserType
    (parser)
    (identifier)
    (parameters)
   )
   (parserStates
    (parserState
     (state)
     (identifier)
     (parserStatements
      (parserStatement
       (conditionalStatement
        (if)
        (expression
         (simple_expression
          (booleanLiteralExpression
           (true)
          )
         )
        )
        (statement
         (blockStatement)
        )
        (else)
        (statement
         (blockStatement)
        )
       )
      )
     )
     (parserTransitionStatement
      (transition)
      (transitionSelectionExpression
       (identifier)
      )
     )
    )
   )
  )
 )
)

=========================
Simple Assignment Statement (To Identifier)
=========================
parser simple() {
  state start {
    string l = "testing";
    l = "five";
    transition accept;
  }
};

---
(p4program
 (declaration
  (parserDeclaration
   (parserType
    (parser)
    (identifier)
    (parameters)
   )
   (parserStates
    (parserState
     (state)
     (identifier)
     (parserStatements
      (parserStatement
       (variableDeclaration
        (typeRef
         (baseType
          (string)
         )
        )
        (identifier)
        (assignment)
        (expression
         (simple_expression
          (string_literal)
         )
        )
       )
      )
      (parserStatement
       (assignmentStatement
        (expression
         (simple_expression
          (identifier)
         )
        )
        (assignment)
        (expression
         (simple_expression
          (string_literal)
         )
        )
       )
      )
     )
     (parserTransitionStatement
      (transition)
      (transitionSelectionExpression
       (identifier)
      )
     )
    )
   )
  )
 )
)
 
=========================
Simple Conditional Statement 
=========================
parser simple() {
  state start {
    bool x = true;
    if (x) {
      x = false;
    }
    transition accept;
  }
};

---
(p4program
 (declaration
  (parserDeclaration
   (parserType
    (parser)
    (identifier)
    (parameters)
   )
   (parserStates
    (parserState
     (state)
     (identifier)
     (parserStatements
      (parserStatement
       (variableDeclaration
        (typeRef
         (baseType
          (bool)
         )
        )
        (identifier)
        (assignment)
        (expression
         (simple_expression
          (booleanLiteralExpression
           (true)
          )
         )
        )
       )
      )
      (parserStatement
       (conditionalStatement
        (if)
        (expression
         (simple_expression
          (identifier)
         )
        )
        (statement
         (blockStatement
          (statements
           (statement
            (assignmentStatement
             (expression
              (simple_expression
               (identifier)
              )
             )
             (assignment)
             (expression
              (simple_expression
               (booleanLiteralExpression
                (false)
               )
              )
             )
            )
           )
          )
         )
        )
       )
      )
     )
     (parserTransitionStatement
      (transition)
      (transitionSelectionExpression
       (identifier)
      )
     )
    )
   )
  )
 )
)
 
=========================
Simple Conditional Statement (with else)
=========================
parser simple() {
  state start {
    bool x = true;
    int y = 0;
    if (x) {
      y = 1;
    } else {
      y = 2;
    }
    transition accept;
  }
};

---
(p4program
 (declaration
  (parserDeclaration
   (parserType
    (parser)
    (identifier)
    (parameters)
   )
   (parserStates
    (parserState
     (state)
     (identifier)
     (parserStatements
      (parserStatement
       (variableDeclaration
        (typeRef
         (baseType
          (bool)
         )
        )
        (identifier)
        (assignment)
        (expression
         (simple_expression
          (booleanLiteralExpression
           (true)
          )
         )
        )
       )
      )
      (parserStatement
       (variableDeclaration
        (typeRef
         (baseType
          (int)
         )
        )
        (identifier)
        (assignment)
        (expression
         (simple_expression
          (integer)
         )
        )
       )
      )
      (parserStatement
       (conditionalStatement
        (if)
        (expression
         (simple_expression
          (identifier)
         )
        )
        (statement
         (blockStatement
          (statements
           (statement
            (assignmentStatement
             (expression
              (simple_expression
               (identifier)
              )
             )
             (assignment)
             (expression
              (simple_expression
               (integer)
              )
             )
            )
           )
          )
         )
        )
        (else)
        (statement
         (blockStatement
          (statements
           (statement
            (assignmentStatement
             (expression
              (simple_expression
               (identifier)
              )
             )
             (assignment)
             (expression
              (simple_expression
               (integer)
              )
             )
            )
           )
          )
         )
        )
       )
      )
     )
     (parserTransitionStatement
      (transition)
      (transitionSelectionExpression
       (identifier)
      )
     )
    )
   )
  )
 )
)