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Char

Char->codepoint

Get the codepoint field from a char.

Signature
(char->codepoint x) → codepoint
Arguments: x — Guard (charp x).
Returns: codepoint — Type (natp codepoint).

This is an ordinary field accessor created by fty::defprod.

Definitions and Theorems

Function: char->codepoint$inline

(defun char->codepoint$inline (x)
  (declare (xargs :guard (charp x)))
  (declare (xargs :guard t))
  (let ((__function__ 'char->codepoint))
    (declare (ignorable __function__))
    (mbe :logic
         (b* ((x (and t x))
              (codepoint (nfix (cdr (std::da-nth 0 (cdr x))))))
           (if (<= codepoint 1114111) codepoint 0))
         :exec (cdr (std::da-nth 0 (cdr x))))))

Theorem: natp-of-char->codepoint

(defthm natp-of-char->codepoint
  (b* ((codepoint (char->codepoint$inline x)))
    (natp codepoint))
  :rule-classes :rewrite)

Theorem: char->codepoint$inline-of-char-fix-x

(defthm char->codepoint$inline-of-char-fix-x
  (equal (char->codepoint$inline (char-fix x))
         (char->codepoint$inline x)))

Theorem: char->codepoint$inline-char-equiv-congruence-on-x

(defthm char->codepoint$inline-char-equiv-congruence-on-x
  (implies (char-equiv x x-equiv)
           (equal (char->codepoint$inline x)
                  (char->codepoint$inline x-equiv)))
  :rule-classes :congruence)