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misc/emacs: handle backslash in raw string in Emacs 23

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Go-mode in Emacs 23 does not recognize a backslash followed
by a backquote as end of raw string literal, as it does not
support syntax-propertize-function which Go-mode uses to
remove special meaning from backslashes in ``.

This patch provides a fallback mechanism to do the same thing
using font-lock-syntactic-keywords, which is supported by
Emacs 23.

LGTM=dominik.honnef
R=golang-codereviews, dominik.honnef
CC=adonovan, golang-codereviews
https://golang.org/cl/78730048
This commit is contained in:
Rui Ueyama 2014-03-27 15:22:52 -04:00 committed by Alan Donovan
parent 5a23a7e52c
commit 444dd26bf4
1 changed files with 13 additions and 1 deletions
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14
misc/emacs/go-mode.el
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@ -272,6 +272,7 @@ For mode=set, all covered lines will have this weight."
`((,go-func-meth-regexp 2 font-lock-function-name-face))) ;; method name
`(
("\\(`[^`]*`\\)" 1 font-lock-multiline) ;; raw string literal, needed for font-lock-syntactic-keywords
(,(concat (go--regexp-enclose-in-symbol "type") "[[:space:]]+\\([^[:space:]]+\\)") 1 font-lock-type-face) ;; types
(,(concat (go--regexp-enclose-in-symbol "type") "[[:space:]]+" go-identifier-regexp "[[:space:]]*" go-type-name-regexp) 1 font-lock-type-face) ;; types
(,(concat "[^[:word:][:multibyte:]]\\[\\([[:digit:]]+\\|\\.\\.\\.\\)?\\]" go-type-name-regexp) 2 font-lock-type-face) ;; Arrays/slices
@ -290,6 +291,14 @@ For mode=set, all covered lines will have this weight."
(,(concat "^[[:space:]]*\\(" go-label-regexp "\\)[[:space:]]*:\\(\\S.\\|$\\)") 1 font-lock-constant-face) ;; Labels and compound literal fields
(,(concat (go--regexp-enclose-in-symbol "\\(goto\\|break\\|continue\\)") "[[:space:]]*\\(" go-label-regexp "\\)") 2 font-lock-constant-face)))) ;; labels in goto/break/continue
(defconst go--font-lock-syntactic-keywords
;; Override syntax property of raw string literal contents, so that
;; backslashes have no special meaning in ``. Used in Emacs 23 or older.
'(("\\(`\\)\\([^`]*\\)\\(`\\)"
(1 (7 . ?`))
(2 (15 . nil)) ;; 15 = "generic string"
(3 (7 . ?`)))))
(defvar go-mode-map
(let ((m (make-sparse-keymap)))
(define-key m "}" #'go-mode-insert-and-indent)
@ -564,7 +573,10 @@ recommended that you look at goflymake
(set (make-local-variable 'parse-sexp-lookup-properties) t)
(if (boundp 'syntax-propertize-function)
(set (make-local-variable 'syntax-propertize-function) #'go-propertize-syntax))
(set (make-local-variable 'syntax-propertize-function) #'go-propertize-syntax)
(set (make-local-variable 'font-lock-syntactic-keywords)
go--font-lock-syntactic-keywords)
(set (make-local-variable 'font-lock-multiline) t))
(set (make-local-variable 'go-dangling-cache) (make-hash-table :test 'eql))
(add-hook 'before-change-functions (lambda (x y) (setq go-dangling-cache (make-hash-table :test 'eql))) t t)