1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
;;; gn-mode.el - A major mode for editing gn files.
;; Copyright 2015 The Chromium Authors. All rights reserved.
;; Use of this source code is governed by a BSD-style license that can be
;; found in the LICENSE file.
;; Author: Elliot Glaysher <erg@chromium.org>
;; Created: April 03, 2015
;; Keywords: tools, gn, ninja, chromium
;; This file is not part of GNU Emacs.
;;; Commentary:
;; A major mode for editing GN files. GN stands for Generate Ninja. GN is the
;; meta build system used in Chromium. For more information on GN, see the GN
;; manual: <https://gn.googlesource.com/gn/+/refs/heads/master/README.md>
;;; To Do:
;; - We syntax highlight builtin actions, but don't highlight instantiations of
;; templates. Should we?
(require 'smie)
(defgroup gn nil
"Major mode for editing Generate Ninja files."
:prefix "gn-"
:group 'languages)
(defcustom gn-indent-basic 2
"The number of spaces to indent a new scope."
:group 'gn
:type 'integer)
(defcustom gn-format-command "gn format --stdin"
"The command to run to format gn files in place."
:group 'gn
:type 'string)
(defgroup gn-faces nil
"Faces used in Generate Ninja mode."
:group 'gn
:group 'faces)
(defface gn-embedded-variable
'((t :inherit font-lock-variable-name-face))
"Font lock face used to highlight variable names in strings."
:group 'gn-faces)
(defface gn-embedded-variable-boundary
'((t :bold t
:inherit gn-embedded-variable))
"Font lock face used to highlight the '$' that starts a
variable name or the '{{' and '}}' which surround it."
:group 'gn-faces)
(defvar gn-font-lock-reserved-keywords
'("true" "false" "if" "else"))
(defvar gn-font-lock-target-declaration-keywords
'("action" "action_foreach" "bundle_data" "copy" "create_bundle" "executable"
"group" "loadable_module" "shared_library" "source_set" "static_library"
"generated_file" "target" "rust_library" "rust_proc_macro"))
;; pool() is handled specially since it's also a variable name
(defvar gn-font-lock-buildfile-fun-keywords
'("assert" "config" "declare_args" "defined" "exec_script" "foreach"
"forward_variables_from" "get_label_info" "get_path_info"
"get_target_outputs" "getenv" "import" "not_needed" "print"
"process_file_template" "read_file" "rebase_path" "set_default_toolchain"
"set_defaults" "split_list" "string_join" "string_split" "template" "tool"
"toolchain" "propagates_configs" "write_file"))
(defvar gn-font-lock-predefined-var-keywords
'("current_cpu" "current_os" "current_toolchain" "default_toolchain"
"host_cpu" "host_os" "invoker" "python_path" "root_build_dir" "root_gen_dir"
"root_out_dir" "target_cpu" "target_gen_dir" "target_name" "target_os"
"target_out_dir"))
(defvar gn-font-lock-var-keywords
'("all_dependent_configs" "allow_circular_includes_from" "arflags" "args"
"asmflags" "assert_no_deps" "bundle_deps_filter" "bundle_executable_dir"
"bundle_resources_dir" "bundle_root_dir" "cflags" "cflags_c" "cflags_cc"
"cflags_objc" "cflags_objcc" "check_includes" "post_processing_args"
"post_processing_manifest" "post_processing_outputs"
"post_processing_script" "post_processing_sources" "complete_static_lib"
"configs" "data" "data_deps" "defines" "depfile" "deps" "framework_dir"
"frameworks" "include_dirs" "inputs" "ldflags" "lib_dirs" "libs"
"output_dir" "output_extension" "output_name" "output_prefix_override"
"outputs" "pool" "precompiled_header" "precompiled_header_type"
"precompiled_source" "product_type" "public" "public_configs"
"public_deps" "response_file_contents" "script" "sources" "testonly"
"visibility" "write_runtime_deps" "bundle_contents_dir" "contents"
"output_conversion" "rebase" "data_keys" "walk_keys"))
(defconst gn-font-lock-keywords
`((,(regexp-opt gn-font-lock-reserved-keywords 'words) .
font-lock-keyword-face)
(,(regexp-opt gn-font-lock-target-declaration-keywords 'words) .
font-lock-type-face)
(,(regexp-opt gn-font-lock-buildfile-fun-keywords 'words) .
font-lock-function-name-face)
;; pool() as a function
("\\<\\(pool\\)\\s-*("
(1 font-lock-function-name-face))
(,(regexp-opt gn-font-lock-predefined-var-keywords 'words) .
font-lock-constant-face)
(,(regexp-opt gn-font-lock-var-keywords 'words) .
font-lock-variable-name-face)
;; $variables_like_this
("\\(\\$\\)\\([a-zA-Z0-9_]+\\)"
(1 'gn-embedded-variable-boundary t)
(2 'gn-embedded-variable t))
;; ${variables_like_this}
("\\(\\${\\)\\([^\n }]+\\)\\(}\\)"
(1 'gn-embedded-variable-boundary t)
(2 'gn-embedded-variable t)
(3 'gn-embedded-variable-boundary t))
;; {{placeholders}} (see substitute_type.h)
("\\({{\\)\\([^\n }]+\\)\\(}}\\)"
(1 'gn-embedded-variable-boundary t)
(2 'gn-embedded-variable t)
(3 'gn-embedded-variable-boundary t))))
(defun gn-smie-rules (kind token)
"These are slightly modified indentation rules from the SMIE
Indentation Example info page. This changes the :before rule
and adds a :list-intro to handle our x = [ ] syntax."
(pcase (cons kind token)
(`(:elem . basic) gn-indent-basic)
(`(,_ . ",") (smie-rule-separator kind))
(`(:list-intro . "") gn-indent-basic)
(`(:before . ,(or `"[" `"(" `"{"))
(if (smie-rule-hanging-p) (smie-rule-parent)))
(`(:before . "if")
(and (not (smie-rule-bolp)) (smie-rule-prev-p "else")
(smie-rule-parent)))))
(defun gn-fill-paragraph (&optional justify)
"We only fill inside of comments in GN mode."
(interactive "P")
(or (fill-comment-paragraph justify)
;; Never return nil; `fill-paragraph' will perform its default behavior
;; if we do.
t))
(defun gn-run-format ()
"Run 'gn format' on the buffer in place."
(interactive)
;; We can't `save-excursion' here; that will put us at the beginning of the
;; shell output, aka the beginning of the document.
(let ((my-start-line (line-number-at-pos)))
(shell-command-on-region (point-min) (point-max) gn-format-command nil t)
(goto-line my-start-line)))
(defvar gn-mode-map
(let ((map (make-sparse-keymap)))
(define-key map "\C-c\C-f" 'gn-run-format)
map))
;;;###autoload
(define-derived-mode gn-mode prog-mode "GN"
"Major mode for editing gn (Generate Ninja)."
:group 'gn
(setq-local comment-use-syntax t)
(setq-local comment-start "#")
(setq-local comment-end "")
(setq-local indent-tabs-mode nil)
(setq-local fill-paragraph-function 'gn-fill-paragraph)
(setq-local font-lock-defaults '(gn-font-lock-keywords))
;; For every 'rule("name") {', adds "name" to the imenu for quick navigation.
(setq-local imenu-generic-expression
'((nil "^\s*[a-zA-Z0-9_]+(\"\\([a-zA-Z0-9_]+\\)\")\s*{" 1)))
(smie-setup nil #'gn-smie-rules)
(setq-local smie-indent-basic gn-indent-basic)
;; python style comment: “# …”
(modify-syntax-entry ?# "< b" gn-mode-syntax-table)
(modify-syntax-entry ?\n "> b" gn-mode-syntax-table)
(modify-syntax-entry ?_ "w" gn-mode-syntax-table))
;;;###autoload
(add-to-list 'auto-mode-alist '("\\.gni?\\'" . gn-mode))
(provide 'gn-mode)
|
