1 ;;; GNU Guix --- Functional package management for GNU
2 ;;; Copyright © 2015 Federico Beffa <beffa@fbengineering.ch>
4 ;;; This file is part of GNU Guix.
6 ;;; GNU Guix is free software; you can redistribute it and/or modify it
7 ;;; under the terms of the GNU General Public License as published by
8 ;;; the Free Software Foundation; either version 3 of the License, or (at
9 ;;; your option) any later version.
11 ;;; GNU Guix is distributed in the hope that it will be useful, but
12 ;;; WITHOUT ANY WARRANTY; without even the implied warranty of
13 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 ;;; GNU General Public License for more details.
16 ;;; You should have received a copy of the GNU General Public License
17 ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
19 (define-module (guix import cabal)
20 #:use-module (ice-9 match)
21 #:use-module (ice-9 regex)
22 #:use-module (ice-9 rdelim)
23 #:use-module (ice-9 receive)
24 #:use-module (srfi srfi-26)
25 #:use-module (srfi srfi-34)
26 #:use-module (srfi srfi-35)
27 #:use-module (srfi srfi-11)
28 #:use-module (srfi srfi-1)
29 #:use-module (srfi srfi-9)
30 #:use-module (srfi srfi-9 gnu)
31 #:use-module (system base lalr)
32 #:use-module (rnrs enums)
40 cabal-package-home-page
41 cabal-package-source-repository
42 cabal-package-synopsis
43 cabal-package-description
44 cabal-package-executables
46 cabal-package-test-suites
48 cabal-package-eval-environment
50 cabal-source-repository?
51 cabal-source-repository-use-case
52 cabal-source-repository-type
53 cabal-source-repository-location
57 cabal-flag-description
63 cabal-dependency-version
67 cabal-executable-dependencies
70 cabal-library-dependencies
74 cabal-test-suite-dependencies))
78 ;; Functions used to read a Cabal file.
82 ;; The use of virtual closing braces VCCURLY and some lexer functions were
83 ;; inspired from http://hackage.haskell.org/package/haskell-src
85 ;; Object containing information about the structure of a block: (i) delimited
86 ;; by braces or by indentation, (ii) minimum indentation.
87 (define-record-type <parse-context>
88 (make-parse-context mode indentation)
90 (mode parse-context-mode) ; 'layout or 'no-layout
91 (indentation parse-context-indentation)) ; #f for 'no-layout
93 ;; <parse-context> mode set universe
94 (define-enumeration context (layout no-layout) make-context)
97 "Creates a simple stack closure. Actions on the generated stack are
98 requested by calling it with one of the following symbols as the first
99 argument: 'empty?, 'push!, 'top, 'pop! and 'clear!. The action 'push! is the
100 only one requiring a second argument corresponding to the object to be added
104 (cond ((eqv? msg 'empty?) (null? stack))
105 ((eqv? msg 'push!) (set! stack (cons (first args) stack)))
106 ((eqv? msg 'top) (if (null? stack) '() (first stack)))
107 ((eqv? msg 'pop!) (match stack
108 ((e r ...) (set! stack (cdr stack)) e)
110 ((eqv? msg 'clear!) (set! stack '()))
113 ;; Stack to track the structure of nested blocks and simple interface
114 (define context-stack (make-parameter (make-stack)))
116 (define (context-stack-empty?) ((context-stack) 'empty?))
118 (define (context-stack-push! e) ((context-stack) 'push! e))
120 (define (context-stack-top) ((context-stack) 'top))
122 (define (context-stack-pop!) ((context-stack) 'pop!))
124 (define (context-stack-clear!) ((context-stack) 'clear!))
126 ;; Indentation of the line being parsed.
127 (define current-indentation (make-parameter 0))
129 ;; Signal to reprocess the beginning of line, in case we need to close more
130 ;; than one indentation level.
131 (define check-bol? (make-parameter #f))
133 ;; Name of the file being parsed. Used in error messages.
134 (define cabal-file-name (make-parameter "unknowk"))
136 ;; Specify the grammar of a Cabal file and generate a suitable syntax analyser.
137 (define (make-cabal-parser)
138 "Generate a parser for Cabal files."
140 ;; --- token definitions
141 (CCURLY VCCURLY OPAREN CPAREN TEST ID VERSION RELATION TRUE FALSE
142 (right: IF FLAG EXEC TEST-SUITE SOURCE-REPO BENCHMARK LIB OCURLY)
147 (body (properties sections) : (append $1 $2))
148 (sections (sections flags) : (append $1 $2)
149 (sections source-repo) : (append $1 (list $2))
150 (sections executables) : (append $1 $2)
151 (sections test-suites) : (append $1 $2)
152 (sections benchmarks) : (append $1 $2)
153 (sections lib-sec) : (append $1 (list $2))
155 (flags (flags flag-sec) : (append $1 (list $2))
156 (flag-sec) : (list $1))
157 (flag-sec (FLAG OCURLY properties CCURLY) : `(section flag ,$1 ,$3)
158 (FLAG open properties close) : `(section flag ,$1 ,$3)
159 (FLAG) : `(section flag ,$1 '()))
160 (source-repo (SOURCE-REPO OCURLY properties CCURLY)
161 : `(section source-repository ,$1 ,$3)
162 (SOURCE-REPO open properties close)
163 : `(section source-repository ,$1 ,$3))
164 (properties (properties PROPERTY) : (append $1 (list $2))
165 (PROPERTY) : (list $1))
166 (executables (executables exec-sec) : (append $1 (list $2))
167 (exec-sec) : (list $1))
168 (exec-sec (EXEC OCURLY exprs CCURLY) : `(section executable ,$1 ,$3)
169 (EXEC open exprs close) : `(section executable ,$1 ,$3))
170 (test-suites (test-suites ts-sec) : (append $1 (list $2))
171 (ts-sec) : (list $1))
172 (ts-sec (TEST-SUITE OCURLY exprs CCURLY) : `(section test-suite ,$1 ,$3)
173 (TEST-SUITE open exprs close) : `(section test-suite ,$1 ,$3))
174 (benchmarks (benchmarks bm-sec) : (append $1 (list $2))
175 (bm-sec) : (list $1))
176 (bm-sec (BENCHMARK OCURLY exprs CCURLY) : `(section benchmark ,$1 ,$3)
177 (BENCHMARK open exprs close) : `(section benchmark ,$1 ,$3))
178 (lib-sec (LIB OCURLY exprs CCURLY) : `(section library ,$3)
179 (LIB open exprs close) : `(section library ,$3))
180 (exprs (exprs PROPERTY) : (append $1 (list $2))
181 (PROPERTY) : (list $1)
182 (exprs if-then-else) : (append $1 (list $2))
183 (if-then-else) : (list $1)
184 (exprs if-then) : (append $1 (list $2))
185 (if-then) : (list $1))
186 (if-then-else (IF tests OCURLY exprs CCURLY ELSE OCURLY exprs CCURLY)
188 (IF tests open exprs close ELSE OCURLY exprs CCURLY)
190 ;; The 'open' token after 'tests' is shifted after an 'exprs'
191 ;; is found. This is because, instead of 'exprs' a 'OCURLY'
192 ;; token is a valid alternative. For this reason, 'open'
193 ;; pushes a <parse-context> with a line indentation equal to
194 ;; the indentation of 'exprs'.
196 ;; Differently from this, without the rule above this
197 ;; comment, when an 'ELSE' token is found, the 'open' token
198 ;; following the 'ELSE' would be shifted immediately, before
199 ;; the 'exprs' is found (because there are no other valid
200 ;; tokens). The 'open' would therefore create a
201 ;; <parse-context> with the indentation of 'ELSE' and not
202 ;; 'exprs', creating an inconsistency. We therefore allow
203 ;; mixed style conditionals.
204 (IF tests open exprs close ELSE open exprs close)
206 (if-then (IF tests OCURLY exprs CCURLY) : `(if ,$2 ,$4 ())
207 (IF tests open exprs close) : `(if ,$2 ,$4 ()))
208 (tests (TEST OPAREN ID CPAREN) : `(,$1 ,$3)
211 (TEST OPAREN ID RELATION VERSION CPAREN)
212 : `(,$1 ,(string-append $3 " " $4 " " $5))
213 (TEST OPAREN ID RELATION VERSION AND RELATION VERSION CPAREN)
214 : `(and (,$1 ,(string-append $3 " " $4 " " $5))
215 (,$1 ,(string-append $3 " " $7 " " $8)))
216 (NOT tests) : `(not ,$2)
217 (tests AND tests) : `(and ,$1 ,$3)
218 (tests OR tests) : `(or ,$1 ,$3)
219 (OPAREN tests CPAREN) : $2)
220 (open () : (context-stack-push!
221 (make-parse-context (context layout)
222 (current-indentation))))
225 (define (peek-next-line-indent port)
226 "This function can be called when the next character on PORT is #\newline
227 and returns the indentation of the line starting after the #\newline
228 character. Discard (and consume) empty and comment lines."
229 (let ((initial-newline (string (read-char port))))
230 (let loop ((char (peek-char port))
232 (cond ((eqv? char #\newline) (read-char port)
233 (loop (peek-char port) ""))
234 ((or (eqv? char #\space) (eqv? char #\tab))
235 (let ((c (read-char port)))
236 (loop (peek-char port) (string-append word (string c)))))
237 ((comment-line port char) (loop (peek-char port) ""))
239 (let ((len (string-length word)))
240 (unread-string (string-append initial-newline word) port)
243 (define* (read-value port value min-indent #:optional (separator " "))
244 "The next character on PORT must be #\newline. Append to VALUE the
245 following lines with indentation larger than MIN-INDENT."
246 (let loop ((val (string-trim-both value))
247 (x (peek-next-line-indent port)))
250 (read-char port) ; consume #\newline
252 val (if (string-null? val) "" separator)
253 (string-trim-both (read-delimited "\n" port 'peek)))
254 (peek-next-line-indent port)))
257 (define (lex-white-space port bol)
258 "Consume white spaces and comment lines on PORT. If a new line is started return #t,
259 otherwise return BOL (beginning-of-line)."
260 (let loop ((c (peek-char port))
263 ((and (not (eof-object? c))
264 (or (char=? c #\space) (char=? c #\tab)))
266 (loop (peek-char port) bol))
267 ((and (not (eof-object? c)) (char=? c #\newline))
269 (loop (peek-char port) #t))
270 ((comment-line port c)
271 (lex-white-space port bol))
275 (define (lex-bol port)
276 "Process the beginning of a line on PORT: update current-indentation and
277 check the end of an indentation based context."
278 (let ((loc (make-source-location (cabal-file-name) (port-line port)
279 (port-column port) -1 -1)))
280 (current-indentation (source-location-column loc))
281 (case (get-offside port)
283 (check-bol? #t) ; need to check if closing more than 1 indent level.
284 (unless (context-stack-empty?) (context-stack-pop!))
285 (make-lexical-token 'VCCURLY loc #f))
289 (define (bol? port) (or (check-bol?) (= (port-column port) 0)))
291 (define (comment-line port c)
292 "If PORT starts with a comment line, consume it up to, but not including
293 #\newline. C is the next character on PORT."
294 (cond ((and (not (eof-object? c)) (char=? c #\-))
296 (let ((c2 (peek-char port)))
298 (read-delimited "\n" port 'peek)
299 (begin (unread-char c port) #f))))
302 (define-enumeration ordering (less-than equal greater-than) make-ordering)
304 (define (get-offside port)
305 "In an indentation based context return the symbol 'greater-than, 'equal or
306 'less-than to signal if the current column number on PORT is greater-, equal-,
307 or less-than the indentation of the current context."
308 (let ((x (port-column port)))
309 (match (context-stack-top)
310 (($ <parse-context> 'layout indentation)
312 ((> x indentation) (ordering greater-than))
313 ((= x indentation) (ordering equal))
314 (else (ordering less-than))))
315 (_ (ordering greater-than)))))
317 ;; (Semi-)Predicates for individual tokens.
319 (define (is-relation? c)
320 (and (char? c) (any (cut char=? c <>) '(#\< #\> #\=))))
322 (define* (make-rx-matcher pat #:optional (flag #f))
323 "Compile PAT into a regular expression with FLAG and creates a function
324 matching a string against the created regexp."
326 (make-regexp pat flag)
328 (cut regexp-exec rx <>)))
330 (define is-property (make-rx-matcher "([a-z0-9-]+):[ \t]*(\\w?.*)$"
333 (define is-flag (make-rx-matcher "^flag +([a-z0-9_-]+)"
337 (make-rx-matcher "^source-repository +([a-z0-9_-]+)"
340 (define is-exec (make-rx-matcher "^executable +([a-z0-9_-]+)"
343 (define is-test-suite (make-rx-matcher "^test-suite +([a-z0-9_-]+)"
346 (define is-benchmark (make-rx-matcher "^benchmark +([a-z0-9_-]+)"
349 (define is-lib (make-rx-matcher "^library *" regexp/icase))
351 (define is-else (make-rx-matcher "^else" regexp/icase))
353 (define (is-if s) (string-ci=? s "if"))
355 (define (is-true s) (string-ci=? s "true"))
357 (define (is-false s) (string-ci=? s "false"))
359 (define (is-and s) (string=? s "&&"))
361 (define (is-or s) (string=? s "||"))
364 (let ((cabal-reserved-words
365 '("if" "else" "library" "flag" "executable" "test-suite"
366 "source-repository" "benchmark")))
367 (and (every (cut string-ci<> s <>) cabal-reserved-words)
368 (not (char=? (last (string->list s)) #\:)))))
370 (define (is-test s port)
371 (let ((tests-rx (make-regexp "os|arch|flag|impl"))
372 (c (peek-char port)))
373 (and (regexp-exec tests-rx s) (char=? #\( c))))
375 ;; Lexers for individual tokens.
377 (define (lex-relation loc port)
378 (make-lexical-token 'RELATION loc (read-while is-relation? port)))
380 (define (lex-version loc port)
381 (make-lexical-token 'VERSION loc
382 (read-while char-numeric? port
383 (cut char=? #\. <>) char-numeric?)))
385 (define* (read-while is? port #:optional
386 (is-if-followed-by? (lambda (c) #f))
387 (is-allowed-follower? (lambda (c) #f)))
388 "Read from PORT as long as: (i) either the read character satisfies the
389 predicate IS?, or (ii) it satisfies the predicate IS-IF-FOLLOWED-BY? and the
390 character immediately following it satisfies IS-ALLOWED-FOLLOWER?. Returns a
391 string with the read characters."
392 (let loop ((c (peek-char port))
394 (cond ((and (not (eof-object? c)) (is? c))
395 (let ((c (read-char port)))
396 (loop (peek-char port) (append res (list c)))))
397 ((and (not (eof-object? c)) (is-if-followed-by? c))
398 (let ((c (read-char port))
399 (c2 (peek-char port)))
400 (if (and (not (eof-object? c2)) (is-allowed-follower? c2))
401 (loop c2 (append res (list c)))
402 (begin (unread-char c) (list->string res)))))
403 (else (list->string res)))))
405 (define (lex-property k-v-rx-res loc port)
406 (let ((key (string-downcase (match:substring k-v-rx-res 1)))
407 (value (match:substring k-v-rx-res 2)))
410 (list key `(,(read-value port value (current-indentation)))))))
412 (define (lex-rx-res rx-res token loc)
413 (let ((name (string-downcase (match:substring rx-res 1))))
414 (make-lexical-token token loc name)))
416 (define (lex-flag flag-rx-res loc) (lex-rx-res flag-rx-res 'FLAG loc))
418 (define (lex-src-repo src-repo-rx-res loc)
419 (lex-rx-res src-repo-rx-res 'SOURCE-REPO loc))
421 (define (lex-exec exec-rx-res loc) (lex-rx-res exec-rx-res 'EXEC loc))
423 (define (lex-test-suite ts-rx-res loc) (lex-rx-res ts-rx-res 'TEST-SUITE loc))
425 (define (lex-benchmark bm-rx-res loc) (lex-rx-res bm-rx-res 'BENCHMARK loc))
427 (define (lex-lib loc) (make-lexical-token 'LIB loc #f))
429 (define (lex-else loc) (make-lexical-token 'ELSE loc #f))
431 (define (lex-if loc) (make-lexical-token 'IF loc #f))
433 (define (lex-true loc) (make-lexical-token 'TRUE loc #t))
435 (define (lex-false loc) (make-lexical-token 'FALSE loc #f))
437 (define (lex-and loc) (make-lexical-token 'AND loc #f))
439 (define (lex-or loc) (make-lexical-token 'OR loc #f))
441 (define (lex-id w loc) (make-lexical-token 'ID loc w))
443 (define (lex-test w loc) (make-lexical-token 'TEST loc (string->symbol w)))
445 ;; Lexer for tokens recognizable by single char.
447 (define* (is-ref-char->token ref-char next-char token loc port
448 #:optional (hook-fn #f))
449 "If the next character NEXT-CHAR on PORT is REF-CHAR, then read it,
450 execute HOOK-FN if it isn't #f and return a lexical token of type TOKEN with
451 location information LOC."
452 (cond ((char=? next-char ref-char)
454 (when hook-fn (hook-fn))
455 (make-lexical-token token loc (string next-char)))
458 (define (is-ocurly->token c loc port)
459 (is-ref-char->token #\{ c 'OCURLY loc port
461 (context-stack-push! (make-parse-context
462 (context no-layout) #f)))))
464 (define (is-ccurly->token c loc port)
465 (is-ref-char->token #\} c 'CCURLY loc port (lambda () (context-stack-pop!))))
467 (define (is-oparen->token c loc port)
468 (is-ref-char->token #\( c 'OPAREN loc port))
470 (define (is-cparen->token c loc port)
471 (is-ref-char->token #\) c 'CPAREN loc port))
473 (define (is-not->token c loc port)
474 (is-ref-char->token #\! c 'NOT loc port))
476 (define (is-version? c) (char-numeric? c))
478 ;; Main lexer functions
480 (define (lex-single-char port loc)
481 "Process tokens which can be recognised by peeking the next character on
482 PORT. If no token can be recognized return #f. LOC is the current port
484 (let* ((c (peek-char port)))
485 (cond ((eof-object? c) (read-char port) '*eoi*)
486 ((is-ocurly->token c loc port))
487 ((is-ccurly->token c loc port))
488 ((is-oparen->token c loc port))
489 ((is-cparen->token c loc port))
490 ((is-not->token c loc port))
491 ((is-version? c) (lex-version loc port))
492 ((is-relation? c) (lex-relation loc port))
496 (define (lex-word port loc)
497 "Process tokens which can be recognized by reading the next word form PORT.
498 LOC is the current port location."
499 (let* ((w (read-delimited " ()\t\n" port 'peek)))
500 (cond ((is-if w) (lex-if loc))
501 ((is-test w port) (lex-test w loc))
502 ((is-true w) (lex-true loc))
503 ((is-false w) (lex-false loc))
504 ((is-and w) (lex-and loc))
505 ((is-or w) (lex-or loc))
506 ((is-id w) (lex-id w loc))
507 (else (unread-string w port) #f))))
509 (define (lex-line port loc)
510 "Process tokens which can be recognised by reading a line from PORT. LOC is
511 the current port location."
512 (let* ((s (read-delimited "\n{}" port 'peek)))
514 ((is-property s) => (cut lex-property <> loc port))
515 ((is-flag s) => (cut lex-flag <> loc))
516 ((is-src-repo s) => (cut lex-src-repo <> loc))
517 ((is-exec s) => (cut lex-exec <> loc))
518 ((is-test-suite s) => (cut lex-test-suite <> loc))
519 ((is-benchmark s) => (cut lex-benchmark <> loc))
520 ((is-lib s) (lex-lib loc))
521 ((is-else s) (lex-else loc))
525 (define (lex-token port)
526 (let* ((loc (make-source-location (cabal-file-name) (port-line port)
527 (port-column port) -1 -1)))
528 (or (lex-single-char port loc) (lex-word port loc) (lex-line port loc))))
530 ;; Lexer- and error-function generators
533 "Generates the lexer error function."
534 (let ((p (current-error-port)))
535 (lambda (message . args)
536 (format p "~a" message)
537 (if (and (pair? args) (lexical-token? (car args)))
538 (let* ((token (car args))
539 (source (lexical-token-source token))
540 (line (source-location-line source))
541 (column (source-location-column source)))
542 (format p "~a " (or (lexical-token-value token)
543 (lexical-token-category token)))
544 (when (and (number? line) (number? column))
545 (format p "(at line ~a, column ~a)" (1+ line) column)))
546 (for-each display args))
549 (define (make-lexer port)
550 "Generate the Cabal lexical analyser reading from PORT."
553 (let ((bol (lex-white-space p (bol? p))))
555 (if bol (lex-bol p) (lex-token p))))))
557 (define* (read-cabal #:optional (port (current-input-port))
559 "Read a Cabal file from PORT. FILE-NAME is a string used in error messages.
560 If #f use the function 'port-filename' to obtain it."
561 (let ((cabal-parser (make-cabal-parser)))
562 (parameterize ((cabal-file-name
563 (or file-name (port-filename port) "standard input"))
564 (current-indentation 0)
566 (context-stack (make-stack)))
567 (cabal-parser (make-lexer port) (errorp)))))
571 ;; Evaluate the S-expression returned by 'read-cabal'.
573 ;; This defines the object and interface that we provide to access the Cabal
574 ;; file information. Note that this does not include all the pieces of
575 ;; information of the Cabal file, but only the ones we currently are
577 (define-record-type <cabal-package>
578 (make-cabal-package name version license home-page source-repository
580 executables lib test-suites
581 flags eval-environment)
583 (name cabal-package-name)
584 (version cabal-package-version)
585 (license cabal-package-license)
586 (home-page cabal-package-home-page)
587 (source-repository cabal-package-source-repository)
588 (synopsis cabal-package-synopsis)
589 (description cabal-package-description)
590 (executables cabal-package-executables)
591 (lib cabal-package-library) ; 'library' is a Scheme keyword
592 (test-suites cabal-package-test-suites)
593 (flags cabal-package-flags)
594 (eval-environment cabal-package-eval-environment)) ; alist
596 (set-record-type-printer! <cabal-package>
597 (lambda (package port)
598 (format port "#<cabal-package ~a-~a>"
599 (cabal-package-name package)
600 (cabal-package-version package))))
602 (define-record-type <cabal-source-repository>
603 (make-cabal-source-repository use-case type location)
604 cabal-source-repository?
605 (use-case cabal-source-repository-use-case)
606 (type cabal-source-repository-type)
607 (location cabal-source-repository-location))
609 ;; We need to be able to distinguish the value of a flag from the Scheme #t
611 (define-record-type <cabal-flag>
612 (make-cabal-flag name description default manual)
614 (name cabal-flag-name)
615 (description cabal-flag-description)
616 (default cabal-flag-default) ; 'true or 'false
617 (manual cabal-flag-manual)) ; 'true or 'false
619 (set-record-type-printer! <cabal-flag>
620 (lambda (package port)
621 (format port "#<cabal-flag ~a default:~a>"
622 (cabal-flag-name package)
623 (cabal-flag-default package))))
625 (define-record-type <cabal-dependency>
626 (make-cabal-dependency name version)
628 (name cabal-dependency-name)
629 (version cabal-dependency-version))
631 (define-record-type <cabal-executable>
632 (make-cabal-executable name dependencies)
634 (name cabal-executable-name)
635 (dependencies cabal-executable-dependencies)) ; list of <cabal-dependency>
637 (define-record-type <cabal-library>
638 (make-cabal-library dependencies)
640 (dependencies cabal-library-dependencies)) ; list of <cabal-dependency>
642 (define-record-type <cabal-test-suite>
643 (make-cabal-test-suite name dependencies)
645 (name cabal-test-suite-name)
646 (dependencies cabal-test-suite-dependencies)) ; list of <cabal-dependency>
648 (define (cabal-flags->alist flag-list)
649 "Retrun an alist associating the flag name to its default value from a
650 list of <cabal-flag> objects."
651 (map (lambda (flag) (cons (cabal-flag-name flag) (cabal-flag-default flag)))
654 (define (eval-cabal cabal-sexp env)
655 "Given the CABAL-SEXP produced by 'read-cabal', evaluate all conditionals
656 and return a 'cabal-package' object. The values of all tests can be
657 overwritten by specifying the desired value in ENV. ENV must be an alist.
658 The accepted keys are: \"os\", \"arch\", \"impl\" and a name of a flag. The
659 value associated with a flag has to be either \"true\" or \"false\". The
660 value associated with other keys has to conform to the Cabal file format
663 (let ((env-os (or (assoc-ref env "os") "linux")))
664 (string-match env-os name)))
667 (let ((env-arch (or (assoc-ref env "arch") "x86_64")))
668 (string-match env-arch name)))
670 (define (comp-name+version haskell)
671 "Extract the compiler name and version from the string HASKELL."
672 (let* ((matcher-fn (make-rx-matcher "([a-zA-Z0-9_]+)-([0-9.]+)"))
673 (name (or (and=> (matcher-fn haskell) (cut match:substring <> 1))
675 (version (and=> (matcher-fn haskell) (cut match:substring <> 2))))
676 (values name version)))
678 (define (comp-spec-name+op+version spec)
679 "Extract the compiler specification from SPEC. Return the compiler name,
680 the ordering operation and the version."
681 (let* ((with-ver-matcher-fn (make-rx-matcher
682 "([a-zA-Z0-9_-]+) *([<>=]+) *([0-9.]+) *"))
683 (without-ver-matcher-fn (make-rx-matcher "([a-zA-Z0-9_-]+)"))
684 (name (or (and=> (with-ver-matcher-fn spec)
685 (cut match:substring <> 1))
686 (match:substring (without-ver-matcher-fn spec) 1)))
687 (operator (and=> (with-ver-matcher-fn spec)
688 (cut match:substring <> 2)))
689 (version (and=> (with-ver-matcher-fn spec)
690 (cut match:substring <> 3))))
691 (values name operator version)))
693 (define (impl haskell)
694 (let*-values (((comp-name comp-ver)
695 (comp-name+version (or (assoc-ref env "impl") "ghc")))
696 ((spec-name spec-op spec-ver)
697 (comp-spec-name+op+version haskell)))
698 (if (and spec-ver comp-ver)
700 (string-append "(string" spec-op " \"" comp-name "\""
701 " \"" spec-name "-" spec-ver "\")"))
702 (string-match spec-name comp-name))))
704 (define (cabal-flags)
705 (make-cabal-section cabal-sexp 'flag))
708 (let ((value (or (assoc-ref env name)
709 (assoc-ref (cabal-flags->alist (cabal-flags)) name))))
710 (if (eq? value 'false) #f #t)))
716 ((('if predicate true-group false-group) rest ...)
717 (append (if (eval predicate)
721 (('if predicate true-group false-group)
725 (('flag name) (flag name))
726 (('os name) (os name))
727 (('arch name) (arch name))
728 (('impl name) (impl name))
731 (('not name) (not (eval name)))
732 ;; 'and' and 'or' aren't functions, thus we can't use apply
733 (('and args ...) (fold (lambda (e s) (and e s)) #t (eval args)))
734 (('or args ...) (fold (lambda (e s) (or e s)) #f (eval args)))
735 ;; no need to evaluate flag parameters
736 (('section 'flag name parameters)
737 (list 'section 'flag name parameters))
738 ;; library does not have a name parameter
739 (('section 'library parameters)
740 (list 'section 'library (eval parameters)))
741 (('section type name parameters)
742 (list 'section type name (eval parameters)))
743 (((? string? name) values)
746 (cons (eval element) (eval rest)))
748 (&message (message "Failed to evaluate Cabal file. \
749 See the manual for limitations.")))))))
751 (define (cabal-evaluated-sexp->package evaluated-sexp)
752 (let* ((name (lookup-join evaluated-sexp "name"))
753 (version (lookup-join evaluated-sexp "version"))
754 (license (lookup-join evaluated-sexp "license"))
755 (home-page (lookup-join evaluated-sexp "homepage"))
756 (home-page-or-hackage
757 (if (string-null? home-page)
758 (string-append "http://hackage.haskell.org/package/" name)
760 (source-repository (make-cabal-section evaluated-sexp
762 (synopsis (lookup-join evaluated-sexp "synopsis"))
763 (description (lookup-join evaluated-sexp "description"))
764 (executables (make-cabal-section evaluated-sexp 'executable))
765 (lib (make-cabal-section evaluated-sexp 'library))
766 (test-suites (make-cabal-section evaluated-sexp 'test-suite))
767 (flags (make-cabal-section evaluated-sexp 'flag))
768 (eval-environment '()))
769 (make-cabal-package name version license home-page-or-hackage
770 source-repository synopsis description executables lib
771 test-suites flags eval-environment)))
773 ((compose cabal-evaluated-sexp->package eval) cabal-sexp))
775 (define (make-cabal-section sexp section-type)
776 "Given an SEXP as produced by 'read-cabal', produce a list of objects
777 pertaining to SECTION-TYPE sections. SECTION-TYPE must be one of:
778 'executable, 'flag, 'test-suite, 'source-repository or 'library."
779 (filter-map (cut match <>
780 (('section (? (cut equal? <> section-type)) name parameters)
782 ((test-suite) (make-cabal-test-suite
783 name (dependencies parameters)))
784 ((executable) (make-cabal-executable
785 name (dependencies parameters)))
786 ((source-repository) (make-cabal-source-repository
788 (lookup-join parameters "type")
789 (lookup-join parameters "location")))
791 (let* ((default (lookup-join parameters "default"))
792 (default-true-or-false
793 (if (and default (string-ci=? "false" default))
796 (description (lookup-join parameters "description"))
797 (manual (lookup-join parameters "manual"))
798 (manual-true-or-false
799 (if (and manual (string-ci=? "true" manual))
802 (make-cabal-flag name description
803 default-true-or-false
804 manual-true-or-false)))
806 (('section (? (cut equal? <> section-type) lib) parameters)
807 (make-cabal-library (dependencies parameters)))
811 (define* (lookup-join key-values-list key #:optional (delimiter " "))
812 "Lookup and joint all values pertaining to keys of value KEY in
813 KEY-VALUES-LIST. The optional DELIMITER is used to specify a delimiter string
814 to be added between the values found in different key/value pairs."
816 (filter-map (cut match <>
817 (((? (lambda(x) (equal? x key))) value)
818 (string-join value delimiter))
823 (define dependency-name-version-rx
824 (make-regexp "([a-zA-Z0-9_-]+) *(.*)"))
826 (define (dependencies key-values-list)
827 "Return a list of 'cabal-dependency' objects for the dependencies found in
829 (let ((deps (string-tokenize (lookup-join key-values-list "build-depends" ",")
830 (char-set-complement (char-set #\,)))))
832 (let ((rx-result (regexp-exec dependency-name-version-rx d)))
833 (make-cabal-dependency
834 (match:substring rx-result 1)
835 (match:substring rx-result 2))))
838 ;;; cabal.scm ends here