Function: prettify-symbols-default-compose-p

prettify-symbols-default-compose-p is a byte-compiled function defined in prog-mode.el.gz.

Signature

(prettify-symbols-default-compose-p START END MATCH)

Documentation

Return non-nil iff the symbol MATCH should be composed.

The symbol starts at position START and ends at position END. This is the default for prettify-symbols-compose-predicate which is suitable for most programming languages such as C or Lisp.

Probably introduced at or before Emacs version 25.1.

Source Code

;; Defined in /usr/src/emacs/lisp/progmodes/prog-mode.el.gz
(defun prettify-symbols-default-compose-p (start end _match)
  "Return non-nil iff the symbol MATCH should be composed.
The symbol starts at position START and ends at position END.
This is the default for `prettify-symbols-compose-predicate'
which is suitable for most programming languages such as C or Lisp."
  ;; Check that the chars should really be composed into a symbol.
  (let* ((syntaxes-beg (if (memq (char-syntax (char-after start)) '(?w ?_))
                           '(?w ?_) '(?. ?\\)))
         (syntaxes-end (if (memq (char-syntax (char-before end)) '(?w ?_))
                           '(?w ?_) '(?. ?\\))))
    (not (or (memq (char-syntax (or (char-before start) ?\s)) syntaxes-beg)
             (memq (char-syntax (or (char-after end) ?\s)) syntaxes-end)
             (nth 8 (syntax-ppss))))))