;; a rich language; writing a more suitable parser would be a big job):
;; 2) The globbing syntax <pattern> is not recognized, so special
;; characters in the pattern string must be backslashed.
-;; 3) The << quoting operators are not recognized; see below.
-;; 5) To make '$' work correctly, $' is not recognized as a variable.
-;; Use "$'" or $POSTMATCH instead.
;;
-;; If you don't use font-lock, additional problems will appear:
-;; 1) Regular expression delimiters do not act as quotes, so special
-;; characters such as `'"#:;[](){} may need to be backslashed
-;; in regular expressions and in both parts of s/// and tr///.
-;; 4) The q and qq quoting operators are not recognized; see below.
-;; 5) To make variables such a $' and $#array work, perl-mode treats
-;; $ just like backslash, so '$' is not treated correctly.
-;; 6) Unfortunately, treating $ like \ makes ${var} be treated as an
-;; unmatched }. See below.
-;; 7) When ' (quote) is used as a package name separator, perl-mode
-;; doesn't understand, and thinks it is seeing a quoted string.
-
;; Here are some ugly tricks to bypass some of these problems: the perl
;; expression /`/ (that's a back-tick) usually evaluates harmlessly,
;; but will trick perl-mode into starting a quoted string, which
(defvar perl-quote-like-pairs
'((?\( . ?\)) (?\[ . ?\]) (?\{ . ?\}) (?\< . ?\>)))
+(eval-and-compile
+ (defconst perl--syntax-exp-intro-regexp
+ (concat "\\(?:\\(?:^\\|[^$@&%[:word:]]\\)"
+ (regexp-opt '("split" "if" "unless" "until" "while" "print"
+ "grep" "map" "not" "or" "and" "for" "foreach"))
+ "\\|[-?:.,;|&+*=!~({[]\\|\\(^\\)\\)[ \t\n]*")))
+
;; FIXME: handle here-docs and regexps.
;; <<EOF <<"EOF" <<'EOF' (no space)
;; see `man perlop'
;; *opening* slash. We can afford to mis-match the closing ones
;; here, because they will be re-treated separately later in
;; perl-font-lock-special-syntactic-constructs.
- ((concat "\\(?:\\(?:^\\|[^$@&%[:word:]]\\)"
- (regexp-opt '("split" "if" "unless" "until" "while" "split"
- "grep" "map" "not" "or" "and" "for" "foreach"))
- "\\|[-?:.,;|&+*=!~({[]\\|\\(^\\)\\)[ \t\n]*\\(/\\)")
+ ((concat perl--syntax-exp-intro-regexp "\\(/\\)")
(2 (ignore
(if (and (match-end 1) ; / at BOL.
(save-excursion
(string-to-syntax "\"")))
(perl-syntax-propertize-special-constructs end)))))
;; Here documents.
- ;; TODO: Handle <<WORD. These are trickier because you need to
- ;; disambiguate with the shift operator.
- ("<<[ \t]*\\('[^'\n]*'\\|\"[^\"\n]*\"\\|\\\\[[:alpha:]][[:alnum:]]*\\).*\\(\n\\)"
- (2 (let* ((st (get-text-property (match-beginning 2) 'syntax-table))
+ ((concat
+ "\\(?:"
+ ;; << "EOF", << 'EOF', or << \EOF
+ "<<[ \t]*\\('[^'\n]*'\\|\"[^\"\n]*\"\\|\\\\[[:alpha:]][[:alnum:]]*\\)"
+ ;; The <<EOF case which needs perl--syntax-exp-intro-regexp, to
+ ;; disambiguate with the left-bitshift operator.
+ "\\|" perl--syntax-exp-intro-regexp "<<\\(?1:\\sw+\\)\\)"
+ ".*\\(\n\\)")
+ (3 (let* ((st (get-text-property (match-beginning 3) 'syntax-table))
(name (match-string 1)))
(goto-char (match-end 1))
(if (save-excursion (nth 8 (syntax-ppss (match-beginning 0))))
;; Remember the names of heredocs found on this line.
(cons (pcase (aref name 0)
(`?\\ (substring name 1))
- (_ (substring name 1 -1)))
+ ((or `?\" `?\' `?\`) (substring name 1 -1))
+ (_ name))
(cdr st)))))))
;; We don't call perl-syntax-propertize-special-constructs directly
;; from the << rule, because there might be other elements (between