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Allow using the left shift operator without spaces on both sides

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* lisp/progmodes/ruby-mode.el (ruby-singleton-class-p): Rename to
ruby-verify-heredoc, reverse the meaning of the return value, and
short-circuit if preceded by a symbol not separated by whitespace.

* test/automated/ruby-mode-tests.el (ruby-no-heredoc-left-shift)
(ruby-no-heredoc-class-self): New tests.
This commit is contained in:
Dmitry Gutov 2016-03-08 15:46:19 +02:00
parent 02bf7cc463
commit 366ec7719f
2 changed files with 25 additions and 10 deletions
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26
lisp/progmodes/ruby-mode.el
View File

@ -894,12 +894,18 @@ and `\\' when preceded by `?'."
((and (eq c ?:) (or (not b) (eq (char-syntax b) ? ))))
((eq c ?\\) (eq b ??)))))
(defun ruby-singleton-class-p (&optional pos)
(defun ruby-verify-heredoc (&optional pos)
(save-excursion
(when pos (goto-char pos))
(forward-word-strictly -1)
(and (or (bolp) (not (eq (char-before (point)) ?_)))
(looking-at ruby-singleton-class-re))))
;; Not right after a symbol or prefix character.
;; Method names are only allowed when separated by
;; whitespace. Not a limitation in Ruby, but it's hard for
;; us to do better.
(when (not (memq (car (syntax-after (1- (point)))) '(2 3 6 10)))
(or (not (memq (char-before) '(?\s ?\t)))
(ignore (forward-word-strictly -1))
(eq (char-before) ?_)
(not (looking-at ruby-singleton-class-re))))))
(defun ruby-expr-beg (&optional option)
"Check if point is possibly at the beginning of an expression.
@ -919,7 +925,7 @@ Can be one of `heredoc', `modifier', `expr-qstr', `expr-re'."
nil)
((looking-at ruby-operator-re))
((eq option 'heredoc)
(and (< space 0) (not (ruby-singleton-class-p start))))
(and (< space 0) (ruby-verify-heredoc start)))
((or (looking-at "[\\[({,;]")
(and (looking-at "[!?]")
(or (not (eq option 'modifier))
@ -1894,9 +1900,9 @@ It will be properly highlighted even when the call omits parens.")
("^\\(=\\)begin\\_>" (1 "!"))
;; Handle here documents.
((concat ruby-here-doc-beg-re ".*\\(\n\\)")
(7 (unless (or (nth 8 (save-excursion
(syntax-ppss (match-beginning 0))))
(ruby-singleton-class-p (match-beginning 0)))
(7 (when (and (not (nth 8 (save-excursion
(syntax-ppss (match-beginning 0)))))
(ruby-verify-heredoc (match-beginning 0)))
(put-text-property (match-beginning 7) (match-end 7)
'syntax-table (string-to-syntax "\""))
(ruby-syntax-propertize-heredoc end))))
@ -1920,7 +1926,7 @@ It will be properly highlighted even when the call omits parens.")
(beginning-of-line)
(while (re-search-forward ruby-here-doc-beg-re
(line-end-position) t)
(unless (ruby-singleton-class-p (match-beginning 0))
(when (ruby-verify-heredoc (match-beginning 0))
(push (concat (ruby-here-doc-end-match) "\n") res))))
(save-excursion
;; With multiple openers on the same line, we don't know in which
@ -2166,7 +2172,7 @@ See `font-lock-syntax-table'.")
(1 font-lock-builtin-face))
;; Here-doc beginnings.
(,ruby-here-doc-beg-re
(0 (unless (ruby-singleton-class-p (match-beginning 0))
(0 (when (ruby-verify-heredoc (match-beginning 0))
'font-lock-string-face)))
;; Perl-ish keywords.
"\\_<\\(?:BEGIN\\|END\\)\\_>\\|^__END__$"

9
test/automated/ruby-mode-tests.el
View File

@ -91,6 +91,15 @@ VALUES-PLIST is a list with alternating index and value elements."
(ert-deftest ruby-no-heredoc-inside-quotes ()
(ruby-assert-state "\"<<\", \"\",\nfoo" 3 nil))
(ert-deftest ruby-no-heredoc-left-shift ()
;; We can't really detect the left shift operator (like in similar
;; cases, it depends on the type of foo), so we just require for <<
;; to be preceded by a character from a known set.
(ruby-assert-state "foo(a<<b)" 3 nil))
(ert-deftest ruby-no-heredoc-class-self ()
(ruby-assert-state "class <<self\nend" 3 nil))
(ert-deftest ruby-exit!-font-lock ()
(ruby-assert-face "exit!" 5 font-lock-builtin-face))