1;;; thrift.el --- Major mode for Apache Thrift files
2
3;; Keywords: files
4
5;; Licensed to the Apache Software Foundation (ASF) under one
6;; or more contributor license agreements. See the NOTICE file
7;; distributed with this work for additional information
8;; regarding copyright ownership. The ASF licenses this file
9;; to you under the Apache License, Version 2.0 (the
10;; "License"); you may not use this file except in compliance
11;; with the License. You may obtain a copy of the License at
12;;
13;;   http://www.apache.org/licenses/LICENSE-2.0
14;;
15;; Unless required by applicable law or agreed to in writing,
16;; software distributed under the License is distributed on an
17;; "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
18;; KIND, either express or implied. See the License for the
19;; specific language governing permissions and limitations
20;; under the License.
21;;
22
23;;; Commentary:
24
25;;
26
27;;; Code:
28
29(require 'font-lock)
30
31(defvar thrift-mode-hook nil)
32;;;###autoload
33(add-to-list 'auto-mode-alist '("\\.thrift\\'" . thrift-mode))
34
35(defvar thrift-indent-level 2
36  "Defines 2 spaces for thrift indentation.")
37
38;; syntax coloring
39(defconst thrift-font-lock-keywords
40  (list
41   '("\\<\\(include\\|struct\\|exception\\|typedef\\|const\\|enum\\|service\\|extends\\|void\\|oneway\\|throws\\|optional\\|required\\)\\>" . font-lock-keyword-face)  ;; keywords
42   '("\\<\\(bool\\|byte\\|i16\\|i32\\|i64\\|double\\|string\\|binary\\|map\\|list\\|set\\)\\>" . font-lock-type-face)  ;; built-in types
43   '("\\<\\([0-9]+\\)\\>" . font-lock-variable-name-face)   ;; ordinals
44   '("\\<\\(\\w+\\)\\s-*(" (1 font-lock-function-name-face))  ;; functions
45   )
46  "Thrift Keywords.")
47
48;; indentation
49(defun thrift-indent-line ()
50  "Indent current line as Thrift code."
51  (interactive)
52  (beginning-of-line)
53  (if (bobp)
54      (indent-line-to 0)
55    (let ((not-indented t) cur-indent)
56      (if (looking-at "^[ \t]*\\(}\\|throws\\)")
57          (if (looking-at "^[ \t]*}")
58              (progn
59                (save-excursion
60                  (forward-line -1)
61                  (setq cur-indent (- (current-indentation) thrift-indent-level)))
62                (if (< cur-indent 0)
63                    (setq cur-indent 0)))
64            (progn
65              (save-excursion
66                (forward-line -1)
67                (if (looking-at "^[ \t]*[\\.<>[:word:]]+[ \t]+[\\.<>[:word:]]+[ \t]*(")
68                    (setq cur-indent (+ (current-indentation) thrift-indent-level))
69                  (setq cur-indent (current-indentation))))))
70        (save-excursion
71          (while not-indented
72            (forward-line -1)
73            (if (looking-at "^[ \t]*}")
74                (progn
75                  (setq cur-indent (current-indentation))
76                  (setq not-indented nil))
77              (if (looking-at "^.*{[^}]*$")
78                  (progn
79                    (setq cur-indent (+ (current-indentation) thrift-indent-level))
80                    (setq not-indented nil))
81                (if (bobp)
82                    (setq not-indented nil)))
83              (if (looking-at "^[ \t]*throws")
84                  (progn
85                    (setq cur-indent (- (current-indentation) thrift-indent-level))
86                    (if (< cur-indent 0)
87                        (setq cur-indent 0))
88                    (setq not-indented nil))
89                (if (bobp)
90                    (setq not-indented nil)))
91              (if (looking-at "^[ \t]*[\\.<>[:word:]]+[ \t]+[\\.<>[:word:]]+[ \t]*([^)]*$")
92                  (progn
93                    (setq cur-indent (+ (current-indentation) thrift-indent-level))
94                    (setq not-indented nil))
95                (if (bobp)
96                    (setq not-indented nil)))
97              (if (looking-at "^[ \t]*\\/\\*")
98                  (progn
99                    (setq cur-indent (+ (current-indentation) 1))
100                    (setq not-indented nil))
101                (if (bobp)
102                    (setq not-indented nil)))
103              (if (looking-at "^[ \t]*\\*\\/")
104                  (progn
105                    (setq cur-indent (- (current-indentation) 1))
106                    (setq not-indented nil))
107                (if (bobp)
108                    (setq not-indented nil)))
109              ))))
110      (if cur-indent
111          (indent-line-to cur-indent)
112        (indent-line-to 0)))))
113
114;; C/C++- and sh-style comments; also allowing underscore in words
115(defvar thrift-mode-syntax-table
116  (let ((thrift-mode-syntax-table (make-syntax-table)))
117    (modify-syntax-entry ?_ "w" thrift-mode-syntax-table)
118    (modify-syntax-entry ?# "<" thrift-mode-syntax-table) ; sh-style comments
119    (modify-syntax-entry ?/ ". 124" thrift-mode-syntax-table) ; c/c++-style comments
120    (modify-syntax-entry ?* ". 23b" thrift-mode-syntax-table)
121    (modify-syntax-entry ?\n ">" thrift-mode-syntax-table)
122    thrift-mode-syntax-table)
123  "Syntax table for thrift-mode")
124
125;;;###autoload
126(defun thrift-mode ()
127  "Mode for editing Thrift files."
128  (interactive)
129  (kill-all-local-variables)
130  (set-syntax-table thrift-mode-syntax-table)
131  (set (make-local-variable 'font-lock-defaults) '(thrift-font-lock-keywords))
132  (setq major-mode 'thrift-mode)
133  (setq mode-name "Thrift")
134  (run-hooks 'thrift-mode-hook)
135  (set (make-local-variable 'indent-line-function) 'thrift-indent-line)
136  )
137
138(provide 'thrift)
139;;; thrift.el ends here
140
141