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c8ac1eda IA |
1 | (defpackage :mal |
2 | (:use :common-lisp | |
3 | :types | |
4 | :env | |
5 | :reader | |
6 | :printer | |
7 | :core | |
8 | :utils) | |
9 | (:export :main)) | |
10 | ||
11 | (in-package :mal) | |
12 | ||
13 | (define-condition invalid-function (types:mal-runtime-exception) | |
14 | ((form :initarg :form :reader form) | |
15 | (context :initarg :context :reader context)) | |
16 | (:report (lambda (condition stream) | |
17 | (format stream | |
18 | "Invalid function '~a' provided while ~a" | |
19 | (printer:pr-str (form condition)) | |
20 | (if (string= (context condition) "apply") | |
21 | "applying" | |
22 | "defining macro"))))) | |
23 | ||
24 | ||
25 | (defvar *repl-env* (env:create-mal-env)) | |
26 | ||
27 | (dolist (binding core:ns) | |
28 | (env:set-env *repl-env* | |
29 | (car binding) | |
30 | (cdr binding))) | |
31 | ||
32 | (defvar mal-def! (make-mal-symbol "def!")) | |
33 | (defvar mal-let* (make-mal-symbol "let*")) | |
34 | (defvar mal-do (make-mal-symbol "do")) | |
35 | (defvar mal-if (make-mal-symbol "if")) | |
36 | (defvar mal-fn* (make-mal-symbol "fn*")) | |
37 | (defvar mal-quote (make-mal-symbol "quote")) | |
38 | (defvar mal-quasiquote (make-mal-symbol "quasiquote")) | |
39 | (defvar mal-unquote (make-mal-symbol "unquote")) | |
40 | (defvar mal-splice-unquote (make-mal-symbol "splice-unquote")) | |
41 | (defvar mal-cons (make-mal-symbol "cons")) | |
42 | (defvar mal-concat (make-mal-symbol "concat")) | |
43 | (defvar mal-defmacro! (make-mal-symbol "defmacro!")) | |
44 | (defvar mal-macroexpand (make-mal-symbol "macroexpand")) | |
45 | ||
46 | (defun eval-sequence (sequence env) | |
47 | (map 'list | |
48 | (lambda (ast) (mal-eval ast env)) | |
49 | (types:mal-data-value sequence))) | |
50 | ||
51 | (defun eval-hash-map (hash-map env) | |
52 | (let ((hash-map-value (types:mal-data-value hash-map)) | |
53 | (new-hash-table (types:make-mal-value-hash-table))) | |
54 | (genhash:hashmap (lambda (key value) | |
55 | (setf (genhash:hashref (mal-eval key env) new-hash-table) | |
56 | (mal-eval value env))) | |
57 | hash-map-value) | |
58 | (types:make-mal-hash-map new-hash-table))) | |
59 | ||
60 | (defun eval-ast (ast env) | |
61 | (switch-mal-type ast | |
62 | (types:symbol (env:get-env env ast)) | |
63 | (types:list (eval-sequence ast env)) | |
64 | (types:vector (make-mal-vector (apply 'vector (eval-sequence ast env)))) | |
65 | (types:hash-map (eval-hash-map ast env)) | |
66 | (types:any ast))) | |
67 | ||
68 | (defun is-pair (value) | |
69 | (and (or (mal-list-p value) | |
70 | (mal-vector-p value)) | |
71 | (< 0 (length (types:mal-data-value value))))) | |
72 | ||
73 | (defun quasiquote (ast) | |
74 | (if (not (is-pair ast)) | |
75 | (types:make-mal-list (list mal-quote ast)) | |
76 | (let ((forms (map 'list #'identity (types:mal-data-value ast)))) | |
77 | (cond | |
78 | ((types:mal-data-value= mal-unquote (first forms)) | |
79 | (second forms)) | |
80 | ||
81 | ((and (is-pair (first forms)) | |
82 | (types:mal-data-value= mal-splice-unquote | |
83 | (first (types:mal-data-value (first forms))))) | |
84 | (types:make-mal-list (list mal-concat | |
85 | (second (types:mal-data-value (first forms))) | |
86 | (quasiquote (make-mal-list (cdr forms)))))) | |
87 | ||
88 | (t (types:make-mal-list (list mal-cons | |
89 | (quasiquote (first forms)) | |
90 | (quasiquote (make-mal-list (cdr forms)))))))))) | |
91 | ||
92 | (defun is-macro-call (ast env) | |
93 | (when (types:mal-list-p ast) | |
94 | (let* ((func-symbol (first (types:mal-data-value ast))) | |
95 | (func (when (types:mal-symbol-p func-symbol) | |
96 | (env:find-env env func-symbol)))) | |
97 | (and func | |
98 | (types:mal-fn-p func) | |
99 | (cdr (assoc 'is-macro (types:mal-data-attrs func))))))) | |
100 | ||
101 | (defun mal-macroexpand (ast env) | |
102 | (loop | |
103 | while (is-macro-call ast env) | |
104 | do (let* ((forms (types:mal-data-value ast)) | |
105 | (func (env:get-env env (first forms)))) | |
106 | (setf ast (apply (types:mal-data-value func) | |
107 | (cdr forms))))) | |
108 | ast) | |
109 | ||
110 | (defun mal-read (string) | |
111 | (reader:read-str string)) | |
112 | ||
113 | (defun mal-eval (ast env) | |
114 | (loop | |
115 | do (setf ast (mal-macroexpand ast env)) | |
116 | do (cond | |
117 | ((null ast) (return types:mal-nil)) | |
118 | ((not (types:mal-list-p ast)) (return (eval-ast ast env))) | |
119 | ((zerop (length (types:mal-data-value ast))) (return ast)) | |
120 | (t (let ((forms (types:mal-data-value ast))) | |
121 | (cond | |
122 | ((types:mal-data-value= mal-quote (first forms)) | |
123 | (return (second forms))) | |
124 | ||
125 | ((types:mal-data-value= mal-quasiquote (first forms)) | |
126 | (setf ast (quasiquote (second forms)))) | |
127 | ||
128 | ((types:mal-data-value= mal-macroexpand (first forms)) | |
129 | (return (mal-macroexpand (second forms) env))) | |
130 | ||
131 | ((types:mal-data-value= mal-def! (first forms)) | |
132 | (return (env:set-env env (second forms) (mal-eval (third forms) env)))) | |
133 | ||
134 | ((types:mal-data-value= mal-defmacro! (first forms)) | |
135 | (let ((value (mal-eval (third forms) env))) | |
136 | (return (if (types:mal-fn-p value) | |
137 | (env:set-env env | |
138 | (second forms) | |
139 | (progn | |
140 | (setf (cdr (assoc 'is-macro (types:mal-data-attrs value))) t) | |
141 | value)) | |
142 | (error 'invalid-function | |
143 | :form value | |
144 | :context "macro"))))) | |
145 | ||
146 | ((types:mal-data-value= mal-let* (first forms)) | |
147 | (let ((new-env (env:create-mal-env :parent env)) | |
148 | ;; Convert a potential vector to a list | |
149 | (bindings (map 'list | |
150 | #'identity | |
151 | (types:mal-data-value (second forms))))) | |
152 | ||
153 | (mapcar (lambda (binding) | |
154 | (env:set-env new-env | |
155 | (car binding) | |
156 | (mal-eval (or (cdr binding) | |
157 | types:mal-nil) | |
158 | new-env))) | |
159 | (loop | |
160 | for (symbol value) on bindings | |
161 | by #'cddr | |
162 | collect (cons symbol value))) | |
163 | (setf ast (third forms) | |
164 | env new-env))) | |
165 | ||
166 | ((types:mal-data-value= mal-do (first forms)) | |
167 | (mapc (lambda (form) (mal-eval form env)) | |
168 | (butlast (cdr forms))) | |
169 | (setf ast (car (last forms)))) | |
170 | ||
171 | ((types:mal-data-value= mal-if (first forms)) | |
172 | (let ((predicate (mal-eval (second forms) env))) | |
173 | (setf ast (if (or (types:mal-data-value= predicate types:mal-nil) | |
174 | (types:mal-data-value= predicate types:mal-false)) | |
175 | (fourth forms) | |
176 | (third forms))))) | |
177 | ||
178 | ((types:mal-data-value= mal-fn* (first forms)) | |
179 | (return (let ((arglist (second forms)) | |
180 | (body (third forms))) | |
181 | (types:make-mal-fn (lambda (&rest args) | |
182 | (mal-eval body (env:create-mal-env :parent env | |
183 | :binds (map 'list | |
184 | #'identity | |
185 | (types:mal-data-value arglist)) | |
186 | :exprs args))) | |
187 | :attrs (list (cons 'params arglist) | |
188 | (cons 'ast body) | |
189 | (cons 'env env) | |
190 | (cons 'is-macro nil)))))) | |
191 | ||
192 | (t (let* ((evaluated-list (eval-ast ast env)) | |
193 | (function (car evaluated-list))) | |
194 | ;; If first element is a mal function unwrap it | |
195 | (cond ((types:mal-fn-p function) | |
196 | (let* ((attrs (types:mal-data-attrs function))) | |
197 | (setf ast (cdr (assoc 'ast attrs)) | |
198 | env (env:create-mal-env :parent (cdr (assoc 'env attrs)) | |
199 | :binds (map 'list | |
200 | #'identity | |
201 | (types:mal-data-value (cdr (assoc 'params attrs)))) | |
202 | :exprs (cdr evaluated-list))))) | |
203 | ((types:mal-builtin-fn-p function) | |
204 | (return (apply (types:mal-data-value function) | |
205 | (cdr evaluated-list)))) | |
206 | (t (error 'invalid-function | |
207 | :form function | |
208 | :context "apply"))))))))))) | |
209 | ||
210 | (defun mal-print (expression) | |
211 | (printer:pr-str expression)) | |
212 | ||
213 | (defun rep (string) | |
214 | (handler-case | |
215 | (mal-print (mal-eval (mal-read string) | |
216 | *repl-env*)) | |
217 | (types:mal-error (condition) | |
218 | (format nil | |
219 | "~a" | |
220 | condition)) | |
221 | (error (condition) | |
222 | (format nil | |
223 | "Internal error: ~a" | |
224 | condition)))) | |
225 | ||
226 | (env:set-env *repl-env* | |
227 | (types:make-mal-symbol "eval") | |
228 | (types:make-mal-builtin-fn (lambda (ast) | |
229 | (mal-eval ast *repl-env*)))) | |
230 | ||
231 | (rep "(def! not (fn* (a) (if a false true)))") | |
232 | (rep "(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \")\")))))") | |
233 | (rep "(defmacro! cond (fn* (& xs) (if (> (count xs) 0) (list 'if (first xs) (if (> (count xs) 1) (nth xs 1) (throw \"odd number of forms to cond\")) (cons 'cond (rest (rest xs)))))))") | |
234 | (rep "(defmacro! or (fn* (& xs) (if (empty? xs) nil (if (= 1 (count xs)) (first xs) `(let* (or_FIXME ~(first xs)) (if or_FIXME or_FIXME (or ~@(rest xs))))))))") | |
235 | ||
236 | (defvar *use-readline-p* nil) | |
237 | ||
238 | (defun raw-input (prompt) | |
239 | (format *standard-output* prompt) | |
240 | (force-output *standard-output*) | |
241 | (read-line *standard-input* nil)) | |
242 | ||
243 | (defun mal-readline (prompt) | |
244 | (if *use-readline-p* | |
245 | (cl-readline:readline :prompt prompt | |
246 | :add-history t | |
247 | :novelty-check (lambda (old new) | |
248 | (not (string= old new)))) | |
249 | (raw-input prompt))) | |
250 | ||
251 | (defun mal-writeline (string) | |
252 | (when string | |
253 | (write-line string) | |
254 | (force-output *standard-output*))) | |
255 | ||
256 | (defun repl () | |
257 | (loop do (let ((line (mal-readline "user> "))) | |
258 | (if line | |
259 | (mal-writeline (rep line)) | |
260 | (return))))) | |
261 | ||
262 | (defun run-file (file) | |
263 | (rep (format nil "(load-file \"~a\")" file))) | |
264 | ||
265 | (defun main (&optional (argv nil argv-provided-p)) | |
89676a9f | 266 | |
c8ac1eda IA |
267 | (setf *use-readline-p* (not (or (string= (uiop:getenv "PERL_RL") "false") |
268 | (string= (uiop:getenv "TERM") "dumb")))) | |
269 | ||
89676a9f IA |
270 | ;; In GNU CLISP's batch mode the standard-input seems to be set to some sort |
271 | ;; of input string-stream, this interacts wierdly with the PERL_RL enviroment | |
272 | ;; variable which the test runner sets causing `read-line' on *standard-input* | |
273 | ;; to fail with an empty stream error. The following reinitializes the | |
274 | ;; standard streams | |
275 | ;; | |
276 | ;; See http://www.gnu.org/software/clisp/impnotes/streams-interactive.html | |
277 | #+clisp (setf *standard-input* (ext:make-stream :input) | |
278 | *standard-output* (ext:make-stream :output :buffered t) | |
279 | *error-output* (ext:make-stream :error :buffered t)) | |
280 | ||
c8ac1eda IA |
281 | (let ((args (if argv-provided-p |
282 | argv | |
283 | (cdr (utils:raw-command-line-arguments))))) | |
284 | (env:set-env *repl-env* | |
285 | (types:make-mal-symbol "*ARGV*") | |
286 | (types:wrap-value (cdr args) :listp t)) | |
287 | (if (null args) | |
288 | (repl) | |
289 | (run-file (car args))))) | |
033f64c4 IA |
290 | |
291 | ;;; Workaround for CMUCL's printing of "Reloaded library ... " messages when an | |
292 | ;;; image containing foreign libraries is restored. The extra messages cause the | |
293 | ;;; MAL testcases to fail | |
294 | ||
295 | #+cmucl (progn | |
296 | (defvar *old-standard-output* *standard-output* | |
297 | "Keep track of current value standard output, this is restored after image restore completes") | |
298 | ||
299 | (defun muffle-output () | |
300 | (setf *standard-output* (make-broadcast-stream))) | |
301 | ||
302 | (defun restore-output () | |
303 | (setf *standard-output* *old-standard-output*)) | |
304 | ||
305 | (pushnew #'muffle-output ext:*after-save-initializations*) | |
306 | (setf ext:*after-save-initializations* | |
307 | (append ext:*after-save-initializations* (list #'restore-output)))) |