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
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
|
;; geiser-syntax.el -- guile-specific scheme syntax
;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
;; Start date: Sun Feb 08, 2009 15:03
;; This file is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3 of the License, or
;; (at your option) any later version.
;; This file is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Comentary:
;; Utilities for parsing Guile-specific Scheme syntax.
;;; Code:
(require 'geiser-popup)
(require 'geiser-base)
(require 'scheme)
;;; Indentation:
(defmacro geiser-syntax--scheme-indent (&rest pairs)
`(progn ,@(mapcar (lambda (p)
`(put ',(car p) 'scheme-indent-function ',(cadr p)))
pairs)))
(geiser-syntax--scheme-indent
(begin0 1)
(c-declare 0)
(c-lambda 2)
(case-lambda 0)
(catch defun)
(class defun)
(class* defun)
(compound-unit/sig 0)
(dynamic-wind 0)
(for/fold 2)
(instantiate 2)
(interface 1)
(lambda/kw 1)
(let*-values 1)
(let+ 1)
(let-values 1)
(let/ec 1)
(match defun)
(mixin 2)
(module defun)
(opt-lambda 1)
(parameterize 1)
(parameterize-break 1)
(parameterize* 1)
(pmatch defun)
(quasisyntax/loc 1)
(receive 2)
(send* 1)
(sigaction 1)
(syntax-case 2)
(syntax/loc 1)
(type-case defun)
(unit defun)
(unit/sig 2)
(unless 1)
(when 1)
(while 1)
(with-handlers 1)
(with-method 1)
(with-syntax 1))
;;; A simple scheme reader
(defvar geiser-syntax--read/buffer-limit nil)
(defsubst geiser-syntax--read/eos ()
(or (eobp)
(and (numberp geiser-syntax--read/buffer-limit)
(<= geiser-syntax--read/buffer-limit (point)))))
(defsubst geiser-syntax--read/next-char ()
(unless (geiser-syntax--read/eos)
(forward-char)
(char-after)))
(defsubst geiser-syntax--read/token (token)
(geiser-syntax--read/next-char)
(if (listp token) token (list token)))
(defsubst geiser-syntax--read/elisp ()
(ignore-errors (read (current-buffer))))
(defun geiser-syntax--read/next-token ()
(skip-syntax-forward "->")
(if (geiser-syntax--read/eos) '(eob)
(case (char-after)
(\;
(skip-syntax-forward "^>")
(geiser-syntax--read/next-token))
((?\( ?\[) (geiser-syntax--read/token 'lparen))
((?\) ?\]) (geiser-syntax--read/token 'rparen))
(?. (if (memq (syntax-after (1+ (point))) '(0 11 12))
(geiser-syntax--read/token 'dot)
(cons 'atom (geiser-syntax--read/elisp))))
(?\# (let ((c (geiser-syntax--read/next-char)))
(cond ((not c) '(eob))
((eq c ?:)
(if (geiser-syntax--read/next-char)
(cons 'kwd (geiser-syntax--read/elisp))
'(eob)))
((eq c ?\\) (cons 'char (geiser-syntax--read/elisp)))
((eq c ?\() (geiser-syntax--read/token 'vectorb))
(t (geiser-syntax--read/next-token)))))
(?\' (geiser-syntax--read/token '(quote . quote)))
(?\` (geiser-syntax--read/token
`(backquote . ,backquote-backquote-symbol)))
(?, (if (eq (geiser-syntax--read/next-char) ?@)
(geiser-syntax--read/token `(splice . ,backquote-splice-symbol))
`(unquote . ,backquote-unquote-symbol)))
(?\" (cons 'string (geiser-syntax--read/elisp)))
(t (cons 'atom (geiser-syntax--read/elisp))))))
(defsubst geiser-syntax--read/match (&rest tks)
(let ((token (geiser-syntax--read/next-token)))
(if (memq (car token) tks) token
(error "Unexpected token: %s" token))))
(defsubst geiser-syntax--read/try (&rest tks)
(let ((p (point))
(tk (ignore-errors (apply 'geiser-syntax--read/match tks))))
(unless tk (goto-char p))
tk))
(defun geiser-syntax--read/list ()
(cond ((geiser-syntax--read/try 'dot)
(let ((tail (geiser-syntax--read)))
(geiser-syntax--read/match 'eob 'rparen)
tail))
((geiser-syntax--read/try 'rparen 'eob) nil)
(t (cons (geiser-syntax--read)
(geiser-syntax--read/list)))))
(defun geiser-syntax--read ()
(let ((token (geiser-syntax--read/next-token)))
(case (car token)
(eob nil)
(lparen (geiser-syntax--read/list))
(vectorb (apply 'vector (geiser-syntax--read/list)))
((quote backquote unquote splice) (list (cdr token) (geiser-syntax--read)))
(kwd `(:keyword . ,(cdr token)))
((char string atom) (cdr token))
(t (error "Reading scheme syntax: unexpected token: %s" token)))))
(defsubst geiser-syntax--read/keyword-value (s)
(and (consp s) (eq (car s) :keyword) (cdr s)))
;;; Code parsing:
(defsubst geiser-syntax--skip-comment/string ()
(goto-char (or (nth 8 (syntax-ppss)) (point))))
(defsubst geiser-syntax--nesting-level ()
(or (nth 0 (syntax-ppss)) 0))
(defun geiser-syntax--scan-sexps ()
(save-excursion
(let* ((fst (symbol-at-point))
(path (and fst (list (list fst 0)))))
(while (not (zerop (geiser-syntax--nesting-level)))
(let ((geiser-syntax--read/buffer-limit (1+ (point))))
(backward-up-list)
(let ((form (save-excursion (geiser-syntax--read))))
(when (and (listp form) (car form) (symbolp (car form)))
(let* ((len-1 (1- (length form)))
(prev (and (> len-1 1) (nth (1- len-1) form)))
(prev (and prev (geiser-syntax--read/keyword-value prev))))
(push `(,(car form) ,len-1 ,@(and prev (symbolp prev) (list prev)))
path))))))
(nreverse path))))
(defun geiser-syntax--locals-around-point ()
(when (eq major-mode 'scheme-mode)
(save-excursion
(geiser-syntax--skip-comment/string)
(let* ((ids)
(push-id (lambda (n) (when (symbolp n) (push n ids))))
(get-arg (lambda (n) (if (listp n) (car n) n)))
(push-ids (lambda (is) (mapc push-id (nreverse (mapcar get-arg is))))))
(while (not (zerop (geiser-syntax--nesting-level)))
(let ((geiser-syntax--read/buffer-limit (point)))
(backward-up-list)
(let* ((form (save-excursion (geiser-syntax--read)))
(head (and (listp form) (car form)))
(snd (and head (cadr form)))
(third (and head (caddr form)))
(is (case head
((define define*) (if (listp snd) snd (list snd)))
((let* letrec lambda let)
(if (listp snd) snd
(cons snd (and (eq head 'let)
(listp third)
third))))))
(body (and is (case head
((define define*) (and (listp snd) (cddr form)))
((let let* letrec lambda)
(if (listp snd) (cddr form)
(cdddr form)))))))
(when is
(funcall push-ids
(mapcar 'cdr
(remove-if (lambda (f) (or (not (listp f))
(not (eq (car f) 'define))))
body)))
(funcall push-ids is)))))
(nreverse ids)))))
;;; Fontify strings as Scheme code:
(geiser-popup--define syntax " *geiser syntax analyst*" scheme-mode)
(defun geiser-syntax--font-lock-buffer ()
(let ((name " *geiser font lock*"))
(or (get-buffer name)
(let ((buffer (get-buffer-create name)))
(set-buffer buffer)
(scheme-mode)
buffer))))
(defun geiser-syntax--scheme-str (str)
(save-current-buffer
(set-buffer (geiser-syntax--font-lock-buffer))
(erase-buffer)
(insert str)
(let ((font-lock-verbose nil)) (font-lock-fontify-buffer))
(buffer-string)))
(provide 'geiser-syntax)
;;; geiser-syntax.el ends here
|
