Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/editors/protobuf-mode.el

-;;; protobuf-mode.el --- major mode for editing protocol buffers.
-
-;; Author: Alexandre Vassalotti <alexandre@peadrop.com>
-;; Created: 23-Apr-2009
-;; Version: 0.3
-;; Keywords: google protobuf languages
-
-;; Redistribution and use in source and binary forms, with or without
-;; modification, are permitted provided that the following conditions are
-;; met:
-;;
-;;     * Redistributions of source code must retain the above copyright
-;; notice, this list of conditions and the following disclaimer.
-;;     * Redistributions in binary form must reproduce the above
-;; copyright notice, this list of conditions and the following disclaimer
-;; in the documentation and/or other materials provided with the
-;; distribution.
-;;     * Neither the name of Google Inc. nor the names of its
-;; contributors may be used to endorse or promote products derived from
-;; this software without specific prior written permission.
-;;
-;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-;; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-;; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-;; A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-;; OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-;; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-;; LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-;; DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-;; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-;; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-;; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-;;; Commentary:
-
-;; Installation:
-;;   - Put `protobuf-mode.el' in your Emacs load-path.
-;;   - Add this line to your .emacs file:
-;;       (require 'protobuf-mode)
-;;
-;; You can customize this mode just like any mode derived from CC Mode.  If
-;; you want to add customizations specific to protobuf-mode, you can use the
-;; `protobuf-mode-hook'. For example, the following would make protocol-mode
-;; use 2-space indentation:
-;;
-;;   (defconst my-protobuf-style
-;;     '((c-basic-offset . 2)
-;;       (indent-tabs-mode . nil)))
-;;
-;;   (add-hook 'protobuf-mode-hook
-;;     (lambda () (c-add-style "my-style" my-protobuf-style t)))
-;;
-;; Refer to the documentation of CC Mode for more information about
-;; customization details and how to use this mode.
-;;
-;; TODO:
-;;   - Make highlighting for enum values work properly.
-;;   - Fix the parser to recognize extensions as identifiers and not
-;;     as casts.
-;;   - Improve the parsing of option assignment lists. For example:
-;;       optional int32 foo = 1 [(my_field_option) = 4.5];
-;;   - Add support for fully-qualified identifiers (e.g., with a leading ".").
-
-;;; Code:
-
-(require 'cc-mode)
-
-(eval-when-compile
-  (require 'cc-langs)
-  (require 'cc-fonts))
-
-;; This mode does not inherit properties from other modes. So, we do not use 
-;; the usual `c-add-language' function.
-(eval-and-compile
-  (put 'protobuf-mode 'c-mode-prefix "protobuf-"))
-
-;; The following code uses of the `c-lang-defconst' macro define syntactic
-;; features of protocol buffer language.  Refer to the documentation in the
-;; cc-langs.el file for information about the meaning of the -kwds variables.
-
-(c-lang-defconst c-primitive-type-kwds
-  protobuf '("double" "float" "int32" "int64" "uint32" "uint64" "sint32"
-             "sint64" "fixed32" "fixed64" "sfixed32" "sfixed64" "bool"
-             "string" "bytes" "group"))
-
-(c-lang-defconst c-modifier-kwds
-  protobuf '("required" "optional" "repeated"))
-
-(c-lang-defconst c-class-decl-kwds
-  protobuf '("message" "enum" "service"))
-
-(c-lang-defconst c-constant-kwds
-  protobuf '("true" "false"))
-
-(c-lang-defconst c-other-decl-kwds
-  protobuf '("package" "import"))
-
-(c-lang-defconst c-other-kwds
-  protobuf '("default" "max"))
-
-(c-lang-defconst c-identifier-ops
-  ;; Handle extended identifiers like google.protobuf.MessageOptions
-  protobuf '((left-assoc ".")))
-
-;; The following keywords do not fit well in keyword classes defined by
-;; cc-mode.  So, we approximate as best we can.
-
-(c-lang-defconst c-type-list-kwds
-  protobuf '("extensions" "to" "reserved"))
-
-(c-lang-defconst c-typeless-decl-kwds
-  protobuf '("extend" "rpc" "option" "returns"))
-
-
-;; Here we remove default syntax for loops, if-statements and other C
-;; syntactic features that are not supported by the protocol buffer language.
-
-(c-lang-defconst c-brace-list-decl-kwds
-  ;; Remove syntax for C-style enumerations.
-  protobuf nil)
-
-(c-lang-defconst c-block-stmt-1-kwds
-  ;; Remove syntax for "do" and "else" keywords.
-  protobuf nil)
-
-(c-lang-defconst c-block-stmt-2-kwds
-  ;; Remove syntax for "for", "if", "switch" and "while" keywords.
-  protobuf nil)
-
-(c-lang-defconst c-simple-stmt-kwds
-  ;; Remove syntax for "break", "continue", "goto" and "return" keywords.
-  protobuf nil)
-
-(c-lang-defconst c-paren-stmt-kwds
-  ;; Remove special case for the "(;;)" in for-loops.
-  protobuf nil)
-
-(c-lang-defconst c-label-kwds
-  ;; Remove case label syntax for the "case" and "default" keywords.
-  protobuf nil)
-
-(c-lang-defconst c-before-label-kwds
-  ;; Remove special case for the label in a goto statement.
-  protobuf nil)
-
-(c-lang-defconst c-cpp-matchers
-  ;; Disable all the C preprocessor syntax.
-  protobuf nil)
-
-(c-lang-defconst c-decl-prefix-re
-  ;; Same as for C, except it does not match "(". This is needed for disabling
-  ;; the syntax for casts.
-  protobuf "\\([\{\};,]+\\)")
-
-
-;; Add support for variable levels of syntax highlighting.
-
-(defconst protobuf-font-lock-keywords-1 (c-lang-const c-matchers-1 protobuf)
-  "Minimal highlighting for protobuf-mode.")
-
-(defconst protobuf-font-lock-keywords-2 (c-lang-const c-matchers-2 protobuf)
-  "Fast normal highlighting for protobuf-mode.")
-
-(defconst protobuf-font-lock-keywords-3 (c-lang-const c-matchers-3 protobuf)
-  "Accurate normal highlighting for protobuf-mode.")
-
-(defvar protobuf-font-lock-keywords protobuf-font-lock-keywords-3
-  "Default expressions to highlight in protobuf-mode.")
-
-;; Our syntax table is auto-generated from the keyword classes we defined
-;; previously with the `c-lang-const' macro.
-(defvar protobuf-mode-syntax-table nil
-  "Syntax table used in protobuf-mode buffers.")
-(or protobuf-mode-syntax-table
-    (setq protobuf-mode-syntax-table
-          (funcall (c-lang-const c-make-mode-syntax-table protobuf))))
-
-(defvar protobuf-mode-abbrev-table nil
-  "Abbreviation table used in protobuf-mode buffers.")
-
-(defvar protobuf-mode-map nil
-  "Keymap used in protobuf-mode buffers.")
-(or protobuf-mode-map
-    (setq protobuf-mode-map (c-make-inherited-keymap)))
-
-(easy-menu-define protobuf-menu protobuf-mode-map
-  "Protocol Buffers Mode Commands"
-  (cons "Protocol Buffers" (c-lang-const c-mode-menu protobuf)))
-
-;;;###autoload (add-to-list 'auto-mode-alist '("\\.proto\\'" . protobuf-mode))
-
-;;;###autoload
-(defun protobuf-mode ()
-  "Major mode for editing Protocol Buffers description language.
-
-The hook `c-mode-common-hook' is run with no argument at mode
-initialization, then `protobuf-mode-hook'.
-
-Key bindings:
-\\{protobuf-mode-map}"
-  (interactive)
-  (kill-all-local-variables)
-  (set-syntax-table protobuf-mode-syntax-table)
-  (setq major-mode 'protobuf-mode
-        mode-name "Protocol-Buffers"
-        local-abbrev-table protobuf-mode-abbrev-table
-        abbrev-mode t)
-  (use-local-map protobuf-mode-map)
-  (c-initialize-cc-mode t)
-  (if (fboundp 'c-make-emacs-variables-local)
-      (c-make-emacs-variables-local))
-  (c-init-language-vars protobuf-mode)
-  (c-common-init 'protobuf-mode)
-  (easy-menu-add protobuf-menu)
-  (c-run-mode-hooks 'c-mode-common-hook 'protobuf-mode-hook)
-  (c-update-modeline))
-
-(provide 'protobuf-mode)
-
-;;; protobuf-mode.el ends here