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Expression

Expression-kind

Get the kind (tag) of a expression structure.

Signature
(expression-kind x) → kind
Arguments: x — Guard (expressionp x).

Definitions and Theorems

Function: expression-kind$inline

(defun expression-kind$inline (x)
  (declare (xargs :guard (expressionp x)))
  (let ((__function__ 'expression-kind))
    (declare (ignorable __function__))
    (mbe :logic (cond ((or (atom x) (eq (car x) :literal))
                       :literal)
                      ((eq (car x) :variable) :variable)
                      ((eq (car x) :unary) :unary)
                      ((eq (car x) :binary) :binary)
                      ((eq (car x) :if) :if)
                      ((eq (car x) :when) :when)
                      ((eq (car x) :unless) :unless)
                      ((eq (car x) :cond) :cond)
                      ((eq (car x) :call) :call)
                      ((eq (car x) :multi) :multi)
                      ((eq (car x) :component) :component)
                      ((eq (car x) :bind) :bind)
                      ((eq (car x) :product-construct)
                       :product-construct)
                      ((eq (car x) :product-field)
                       :product-field)
                      ((eq (car x) :product-update)
                       :product-update)
                      ((eq (car x) :sum-construct)
                       :sum-construct)
                      ((eq (car x) :sum-field) :sum-field)
                      ((eq (car x) :sum-update) :sum-update)
                      ((eq (car x) :sum-test) :sum-test)
                      (t :bad-expression))
         :exec (car x))))

Theorem: expression-kind-possibilities

(defthm expression-kind-possibilities
  (or (equal (expression-kind x) :literal)
      (equal (expression-kind x) :variable)
      (equal (expression-kind x) :unary)
      (equal (expression-kind x) :binary)
      (equal (expression-kind x) :if)
      (equal (expression-kind x) :when)
      (equal (expression-kind x) :unless)
      (equal (expression-kind x) :cond)
      (equal (expression-kind x) :call)
      (equal (expression-kind x) :multi)
      (equal (expression-kind x) :component)
      (equal (expression-kind x) :bind)
      (equal (expression-kind x)
             :product-construct)
      (equal (expression-kind x)
             :product-field)
      (equal (expression-kind x)
             :product-update)
      (equal (expression-kind x)
             :sum-construct)
      (equal (expression-kind x) :sum-field)
      (equal (expression-kind x) :sum-update)
      (equal (expression-kind x) :sum-test)
      (equal (expression-kind x)
             :bad-expression))
  :rule-classes
  ((:forward-chaining :trigger-terms ((expression-kind x)))))