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• Vl-find-basename/extension

Vl-split-filename

Split a filename into its basename and extension.

Signature

(vl-split-filename filename) → (mv basename extension)

Arguments

filename — E.g., foo.txt.
    Guard (stringp filename).

Returns

basename — E.g., foo.
    Type (stringp basename).

extension — E.g. txt, or nil when there is no extension.
    Type (maybe-stringp extension).

Definitions and Theorems

Function: vl-split-filename

(defun vl-split-filename (filename)
  (declare (xargs :guard (stringp filename)))
  (let ((__function__ 'vl-split-filename))
    (declare (ignorable __function__))
    (b* ((filename (string-fix filename))
         (pos (str::strrpos "." filename))
         ((unless pos) (mv filename nil))
         (basename (subseq filename 0 pos))
         (extension (subseq filename (+ 1 pos) nil)))
      (mv basename extension))))

Theorem: stringp-of-vl-split-filename.basename

(defthm stringp-of-vl-split-filename.basename
  (b* (((mv ?basename ?extension)
        (vl-split-filename filename)))
    (stringp basename))
  :rule-classes :type-prescription)

Theorem: maybe-stringp-of-vl-split-filename.extension

(defthm maybe-stringp-of-vl-split-filename.extension
  (b* (((mv ?basename ?extension)
        (vl-split-filename filename)))
    (maybe-stringp extension))
  :rule-classes :type-prescription)

Theorem: vl-split-filename-of-str-fix-filename

(defthm vl-split-filename-of-str-fix-filename
  (equal (vl-split-filename (str-fix filename))
         (vl-split-filename filename)))

Theorem: vl-split-filename-streqv-congruence-on-filename

(defthm vl-split-filename-streqv-congruence-on-filename
  (implies (streqv filename filename-equiv)
           (equal (vl-split-filename filename)
                  (vl-split-filename filename-equiv)))
  :rule-classes :congruence)