Function: completion-pcm--string->pattern

completion-pcm--string->pattern is a byte-compiled function defined in minibuffer.el.gz.

Signature

(completion-pcm--string->pattern STRING &optional POINT)

Documentation

Split STRING into a pattern.

A pattern is a list where each element is either a string or a symbol, see completion-pcm--merge-completions.

Source Code

;; Defined in /usr/src/emacs/lisp/minibuffer.el.gz
(defun completion-pcm--string->pattern (string &optional point)
  "Split STRING into a pattern.
A pattern is a list where each element is either a string
or a symbol, see `completion-pcm--merge-completions'."
  (if (and point (< point (length string)))
      (let ((prefix (substring string 0 point))
            (suffix (substring string point)))
        (append (completion-pcm--string->pattern prefix)
                '(point)
                (completion-pcm--string->pattern suffix)))
    (let* ((pattern nil)
           (p 0)
           (p0 p)
           (pending nil))

      (while (and (setq p (string-match completion-pcm--delim-wild-regex
                                        string p))
                  (or completion-pcm-complete-word-inserts-delimiters
                      ;; If the char was added by minibuffer-complete-word,
                      ;; then don't treat it as a delimiter, otherwise
                      ;; "M-x SPC" ends up inserting a "-" rather than listing
                      ;; all completions.
                      (not (get-text-property p 'completion-try-word string))))
        ;; Usually, completion-pcm--delim-wild-regex matches a delimiter,
        ;; meaning that something can be added *before* it, but it can also
        ;; match a prefix and postfix, in which case something can be added
        ;; in-between (e.g. match [[:lower:]][[:upper:]]).
        ;; This is determined by the presence of a submatch-1 which delimits
        ;; the prefix.
        (if (match-end 1) (setq p (match-end 1)))
        (unless (= p0 p)
          (if pending (push pending pattern))
          (push (substring string p0 p) pattern))
        (setq pending nil)
        (if (eq (aref string p) ?*)
            (progn
              (push 'star pattern)
              (setq p0 (1+ p)))
          (push 'any pattern)
          (if (match-end 1)
              (setq p0 p)
            (push (substring string p (match-end 0)) pattern)
            ;; `any-delim' is used so that "a-b" also finds "array->beginning".
            (setq pending 'any-delim)
            (setq p0 (match-end 0))))
        (setq p p0))

      (when (> (length string) p0)
        (if pending (push pending pattern))
        (push (substring string p0) pattern))
      (nreverse pattern))))