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go-mode.el: fix syntax highlighting of backticks
Instead of syntax-tables, an extended go-mode-cs is used for from a font-lock callback. Cache invalidation must happen in a before-change-function because font-lock runs in an after-change-function, potentially before the cache invalidation takes place. Performance is reasonable, even with src/pkg/html/entity.go and test/fixedbugs/bug257.go. Fixes #2330. R=golang-dev, rsc CC=golang-dev https://golang.org/cl/5529045
This commit is contained in:
Florian Weimer
Russ Cox
parent
8a4bd094a0
commit
70ed0ac588
@ -44,17 +44,11 @@
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(modify-syntax-entry ?< "." st)
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(modify-syntax-entry ?> "." st)
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;; Strings
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(modify-syntax-entry ?\" "\"" st)
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(modify-syntax-entry ?\' "\"" st)
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(modify-syntax-entry ?` "\"" st)
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(modify-syntax-entry ?\\ "\\" st)
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;; Comments
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(modify-syntax-entry ?/ ". 124b" st)
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(modify-syntax-entry ?* ". 23" st)
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(modify-syntax-entry ?\n "> b" st)
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(modify-syntax-entry ?\^m "> b" st)
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;; Strings and comments are font-locked separately.
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(modify-syntax-entry ?\" "." st)
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(modify-syntax-entry ?\' "." st)
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(modify-syntax-entry ?` "." st)
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(modify-syntax-entry ?\\ "." st)
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st)
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"Syntax table for Go mode.")
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@ -74,7 +68,9 @@ some syntax analysis.")
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(constants '("nil" "true" "false" "iota"))
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(type-name "\\s *\\(?:[*(]\\s *\\)*\\(?:\\w+\\s *\\.\\s *\\)?\\(\\w+\\)")
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)
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`((,(regexp-opt go-mode-keywords 'words) . font-lock-keyword-face)
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`((go-mode-font-lock-cs-comment 0 font-lock-comment-face t)
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(go-mode-font-lock-cs-string 0 font-lock-string-face t)
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(,(regexp-opt go-mode-keywords 'words) . font-lock-keyword-face)
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(,(regexp-opt builtins 'words) . font-lock-builtin-face)
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(,(regexp-opt constants 'words) . font-lock-constant-face)
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;; Function names in declarations
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@ -165,27 +161,25 @@ will be marked from the beginning up to this point (that is, up
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to and including character (1- go-mode-mark-cs-end)).")
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(make-variable-buffer-local 'go-mode-mark-cs-end)
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(defvar go-mode-mark-cs-state nil
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"The `parse-partial-sexp' state of the comment/string parser as
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of the point `go-mode-mark-cs-end'.")
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(make-variable-buffer-local 'go-mode-mark-cs-state)
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(defvar go-mode-mark-nesting-end 1
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"The point at which the nesting cache ends. The buffer will be
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marked from the beginning up to this point.")
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(make-variable-buffer-local 'go-mode-mark-nesting-end)
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(defun go-mode-mark-clear-cache (b e l)
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"An after-change-function that clears the comment/string and
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(defun go-mode-mark-clear-cache (b e)
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"A before-change-function that clears the comment/string and
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nesting caches from the modified point on."
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(save-restriction
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(widen)
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(when (< b go-mode-mark-cs-end)
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(remove-text-properties b (min go-mode-mark-cs-end (point-max)) '(go-mode-cs nil))
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(setq go-mode-mark-cs-end b
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go-mode-mark-cs-state nil))
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(when (<= b go-mode-mark-cs-end)
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;; Remove the property adjacent to the change position.
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;; It may contain positions pointing beyond the new end mark.
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(let ((b (let ((cs (get-text-property (max 1 (1- b)) 'go-mode-cs)))
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(if cs (car cs) b))))
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(remove-text-properties
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b (min go-mode-mark-cs-end (point-max)) '(go-mode-cs nil))
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(setq go-mode-mark-cs-end b)))
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(when (< b go-mode-mark-nesting-end)
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(remove-text-properties b (min go-mode-mark-nesting-end (point-max)) '(go-mode-nesting nil))
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(setq go-mode-mark-nesting-end b))))
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@ -210,7 +204,7 @@ context-sensitive."
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(progn ,@body)
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(set-buffer-modified-p ,modified-var)))))))
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(defsubst go-mode-cs (&optional pos)
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(defun go-mode-cs (&optional pos)
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"Return the comment/string state at point POS. If point is
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inside a comment or string (including the delimiters), this
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returns a pair (START . END) indicating the extents of the
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@ -218,45 +212,111 @@ comment or string."
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(unless pos
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(setq pos (point)))
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(if (= pos 1)
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nil
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(when (> pos go-mode-mark-cs-end)
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(go-mode-mark-cs pos))
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(get-text-property (- pos 1) 'go-mode-cs)))
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(when (> pos go-mode-mark-cs-end)
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(go-mode-mark-cs pos))
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(get-text-property pos 'go-mode-cs))
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(defun go-mode-mark-cs (end)
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"Mark comments and strings up to point END. Don't call this
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directly; use `go-mode-cs'."
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(setq end (min end (point-max)))
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(go-mode-parser
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(let* ((pos go-mode-mark-cs-end)
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(state (or go-mode-mark-cs-state (syntax-ppss pos))))
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;; Mark comments and strings
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(when (nth 8 state)
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;; Get to the beginning of the comment/string
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(setq pos (nth 8 state)
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state nil))
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(while (> end pos)
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;; Find beginning of comment/string
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(while (and (> end pos)
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(progn
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(setq state (parse-partial-sexp pos end nil nil state 'syntax-table)
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pos (point))
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(not (nth 8 state)))))
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;; Find end of comment/string
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(let ((start (nth 8 state)))
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(when start
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(setq state (parse-partial-sexp pos (point-max) nil nil state 'syntax-table)
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pos (point))
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;; Mark comment
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(put-text-property start (- pos 1) 'go-mode-cs (cons start pos))
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(when nil
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(put-text-property start (- pos 1) 'face
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`((:background "midnight blue")))))))
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;; Update state
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(setq go-mode-mark-cs-end pos
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go-mode-mark-cs-state state))))
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(save-match-data
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(let ((pos
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;; Back up to the last known state.
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(let ((last-cs
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(and (> go-mode-mark-cs-end 1)
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(get-text-property (1- go-mode-mark-cs-end)
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'go-mode-cs))))
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(if last-cs
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(car last-cs)
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(max 1 (1- go-mode-mark-cs-end))))))
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(while (< pos end)
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(goto-char pos)
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(let ((cs-end ; end of the text property
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(cond
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((looking-at "//")
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(end-of-line)
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(point))
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((looking-at "/\\*")
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(goto-char (+ pos 2))
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(if (search-forward "*/" (1+ end) t)
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(point)
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end))
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((looking-at "\"")
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(goto-char (1+ pos))
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(if (looking-at "[^\"\n\\\\]*\\(\\\\.[^\"\n\\\\]*\\)*\"")
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(match-end 0)
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(end-of-line)
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(point)))
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((looking-at "'")
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(goto-char (1+ pos))
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(if (looking-at "[^'\n\\\\]*\\(\\\\.[^'\n\\\\]*\\)*'")
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(match-end 0)
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(end-of-line)
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(point)))
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((looking-at "`")
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(goto-char (1+ pos))
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(while (if (search-forward "`" end t)
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(if (eq (char-after) ?`)
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(goto-char (1+ (point))))
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(goto-char end)
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nil))
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(point)))))
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(cond
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(cs-end
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(put-text-property pos cs-end 'go-mode-cs (cons pos cs-end))
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(setq pos cs-end))
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((re-search-forward "[\"'`]\\|/[/*]" end t)
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(setq pos (match-beginning 0)))
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(t
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(setq pos end)))))
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(setq go-mode-mark-cs-end pos)))))
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(defun go-mode-font-lock-cs (limit comment)
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"Helper function for highlighting comment/strings. If COMMENT is t,
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set match data to the next comment after point, and advance point
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after it. If COMMENT is nil, use the next string. Returns nil
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if no further tokens of the type exist."
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;; Ensures that `next-single-property-change' below will work properly.
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(go-mode-cs limit)
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(let (cs next (result 'scan))
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(while (eq result 'scan)
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(if (or (>= (point) limit) (eobp))
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(setq result nil)
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(setq cs (go-mode-cs))
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(if cs
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(if (eq (= (char-after (car cs)) ?/) comment)
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;; If inside the expected comment/string, highlight it.
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(progn
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;; If the match includes a "\n", we have a
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;; multi-line construct. Mark it as such.
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(goto-char (car cs))
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(when (search-forward "\n" (cdr cs) t)
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(put-text-property
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(car cs) (cdr cs) 'font-lock-multline t))
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(set-match-data (list (car cs) (cdr cs) (current-buffer)))
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(goto-char (cdr cs))
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(setq result t))
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;; Wrong type. Look for next comment/string after this one.
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(goto-char (cdr cs)))
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;; Not inside comment/string. Search for next comment/string.
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(setq next (next-single-property-change
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(point) 'go-mode-cs nil limit))
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(if (and next (< next limit))
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(goto-char next)
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(setq result nil)))))
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result))
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(defun go-mode-font-lock-cs-string (limit)
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"Font-lock iterator for strings."
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(go-mode-font-lock-cs limit nil))
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(defun go-mode-font-lock-cs-comment (limit)
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"Font-lock iterator for comments."
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(go-mode-font-lock-cs limit t))
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(defsubst go-mode-nesting (&optional pos)
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"Return the nesting at point POS. The nesting is a list
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@ -470,9 +530,8 @@ functions, and some types. It also provides indentation that is
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;; Reset the syntax mark caches
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(setq go-mode-mark-cs-end 1
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go-mode-mark-cs-state nil
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go-mode-mark-nesting-end 1)
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(add-hook 'after-change-functions #'go-mode-mark-clear-cache nil t)
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(add-hook 'before-change-functions #'go-mode-mark-clear-cache nil t)
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;; Indentation
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(set (make-local-variable 'indent-line-function)
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