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Update Emacs go-mode for new semicolon rule.
Fixes #415. R=rsc CC=golang-dev https://golang.org/cl/183104
This commit is contained in:
Austin Clements
Russ Cox
parent
cfbee34a27
commit
6712cf365b
@ -59,21 +59,22 @@
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st)
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"Syntax table for Go mode.")
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(defvar go-mode-keywords
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'("break" "default" "func" "interface" "select"
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"case" "defer" "go" "map" "struct"
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"chan" "else" "goto" "package" "switch"
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"const" "fallthrough" "if" "range" "type"
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"continue" "for" "import" "return" "var")
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"All keywords in the Go language. Used for font locking and
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some syntax analysis.")
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(defvar go-mode-font-lock-keywords
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(let ((keywords '("import" "package"
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"var" "const" "type" "func"
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"struct" "interface"
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"chan" "map"
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"if" "else" "for" "switch" "select"
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"range" "case" "default"
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"return" "continue" "break" "fallthrough" "goto"
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"go" "defer"))
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(builtins '("cap" "close" "closed" "len" "make" "new"
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(let ((builtins '("cap" "close" "closed" "len" "make" "new"
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"panic" "panicln" "print" "println"))
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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 keywords 'words) . font-lock-keyword-face)
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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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@ -312,6 +313,37 @@ encountered the close character."
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;; Indentation
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;;
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(defvar go-mode-non-terminating-keywords-regexp
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(let* ((kws go-mode-keywords)
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(kws (remove "break" kws))
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(kws (remove "continue" kws))
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(kws (remove "fallthrough" kws))
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(kws (remove "return" kws)))
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(regexp-opt kws 'words))
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"Regular expression matching all Go keywords that *do not*
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implicitly terminate a statement.")
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(defun go-mode-semicolon-p ()
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"True iff point immediately follows either an explicit or
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implicit semicolon. Point should immediately follow the last
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token on the line."
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;; #Semicolons
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(case (char-before)
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((?\;) t)
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;; String literal
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((?' ?\" ?`) t)
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;; One of the operators and delimiters ++, --, ), ], or }
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((?+) (eq (char-before (1- (point))) ?+))
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((?-) (eq (char-before (1- (point))) ?-))
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((?\) ?\] ?\}) t)
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;; An identifier or one of the keywords break, continue,
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;; fallthrough, or return or a numeric literal
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(otherwise
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(save-excursion
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(when (/= (skip-chars-backward "[:word:]_") 0)
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(not (looking-at go-mode-non-terminating-keywords-regexp)))))))
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(defun go-mode-indentation ()
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"Compute the ideal indentation level of the current line.
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@ -335,25 +367,14 @@ indented one level."
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;; Inside a multi-line string. Don't mess with indentation.
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nil)
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(cs
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;; Inside a multi-line comment
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;; Inside a general comment
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(goto-char (car cs))
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(forward-char 1)
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(current-column))
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((not (go-mode-nesting))
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;; Top-level
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(if (or (eolp)
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(looking-at "\\<\\(import\\|package\\|const\\|var\\|type\\|func\\)\\>")
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(looking-at "//\\|/\\*"))
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0
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;; Continuation line
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;; XXX If you start typing a new continuation line, nothing
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;; will cause it to be indented.
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tab-width))
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(t
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;; Neither top-level nor in a multi-line string or comment
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;; Not in a multi-line string or comment
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(let ((indent 0)
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(inside-indenting-paren nil)
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(current-line-closes-scope nil))
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(inside-indenting-paren nil))
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;; Count every enclosing brace, plus parens that follow
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;; import, const, var, or type and indent according to
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;; depth. This simple rule does quite well, but also has a
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@ -377,28 +398,21 @@ indented one level."
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(setq inside-indenting-paren t)))))
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(setq first nil))))
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(setq current-line-closes-scope
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(case (char-after)
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((?\} ?\)) t)
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(t nil)))
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;; case, default, and labels are outdented 1 level
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(when (looking-at "\\<case\\>\\|\\<default\\>\\|\\w+\\s *:\\(\\S.\\|$\\)")
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(decf indent tab-width)
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;; Lines with case, default, etc. also "close" the previous line's
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;; scope, even when there is no semicolon. Don't treat them as
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;; continuation lines.
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(setq current-line-closes-scope t))
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(decf indent tab-width))
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;; Continuation lines are indented 1 level
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(forward-comment (- (buffer-size)))
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(when (case (char-before)
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((?\{ ?\} ?\; ?:)
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;; Not a continuation line
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((nil ?\{ ?:)
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;; At the beginning of a block or the statement
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;; following a label.
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nil)
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((?\()
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;; Usually a continuation line, unless this paren
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;; counted towards our indentation already
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;; Usually a continuation line in an expression,
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;; unless this paren is part of a factored
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;; declaration.
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(not inside-indenting-paren))
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((?,)
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;; Could be inside a literal. We're a little
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@ -411,10 +425,12 @@ indented one level."
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(and depth
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(not (eq (char-after (caar depth)) ?\{)))))
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(t
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;; Except when the current line closes the previous line's
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;; scope, anything else is a continuation line.
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(not current-line-closes-scope)))
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;; We're in the middle of a block. Did the
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;; previous line end with an implicit or explicit
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;; semicolon?
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(not (go-mode-semicolon-p))))
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(incf indent tab-width))
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(max indent 0)))))))
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(defun go-mode-indent-line ()
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