/usr/share/r6rs/nanopass/helpers.ss is in r6rs-nanopass-dev 1.9+git20160429.g1f7e80b-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 | ;;; Copyright (c) 2000-2015 Dipanwita Sarkar, Andrew W. Keep, R. Kent Dybvig, Oscar Waddell
;;; See the accompanying file Copyright for details
(library (nanopass helpers)
(export
;; auxiliary keywords for language/pass definitions
extends definitions entry terminals nongenerative-id maybe
;; predicates for looking for identifiers independent of context
ellipsis? unquote? colon? arrow? plus? minus? double-arrow?
;; things for dealing with syntax and idetnfieris
all-unique-identifiers? construct-id construct-unique-id gentemp
bound-id-member? bound-id-union partition-syn datum
;; things for dealing with language meta-variables
meta-var->raw-meta-var combine unique-name
;; convenience syntactic forms
rec with-values define-who
;; source information funtions
syntax->source-info
;;; stuff imported from implementation-helpers
;; formatting
format printf pretty-print
;; listy stuff
iota make-list list-head
;; gensym stuff (related to nongenerative languages)
gensym regensym
;; library export stuff (needed for when used inside module to
;; auto-indirect export things)
indirect-export
;; compile-time environment helpers
make-compile-time-value
;; code organization helpers
module
;; useful for warning items
warningf errorf
;; used to get the best performance from hashtables
eq-hashtable-set! eq-hashtable-ref
;; debugging support
trace-lambda trace-define-syntax trace-let trace-define
;; needed to know what code to generate
optimize-level
;; the base record, so that we can use gensym syntax
define-nanopass-record
;; failure token so that we can know when parsing fails with a gensym
np-parse-fail-token
;; handy syntactic stuff
with-implicit with-r6rs-quasiquote with-extended-quasiquote
extended-quasiquote with-auto-unquote
;; abstraction of the grabbing the syntactic environment that will work in
;; Chez, Ikarus, & Vicare
with-compile-time-environment)
(import (rnrs) (nanopass implementation-helpers))
(define-syntax datum
(syntax-rules ()
[(_ e) (syntax->datum #'e)]))
(define-syntax with-r6rs-quasiquote
(lambda (x)
(syntax-case x ()
[(k . body)
(with-implicit (k quasiquote)
#'(let-syntax ([quasiquote (syntax-rules () [(_ x) `x])]) . body))])))
(define-syntax extended-quasiquote
(lambda (x)
(define gather-unquoted-exprs
(lambda (body)
(let f ([body body] [t* '()] [e* '()])
(syntax-case body (unquote unquote-splicing)
[(unquote x)
(identifier? #'x)
(values body (cons #'x t*) (cons #'x e*))]
[(unquote-splicing x)
(identifier? #'x)
(values body (cons #'x t*) (cons #'x e*))]
[(unquote e)
(with-syntax ([(t) (generate-temporaries '(t))])
(values #'(unquote t) (cons #'t t*) (cons #'e e*)))]
[(unquote-splicing e)
(with-syntax ([(t) (generate-temporaries '(t))])
(values #'(unquote-splicing t) (cons #'t t*) (cons #'e e*)))]
[(tmpl0 . tmpl1)
(let-values ([(tmpl0 t* e*) (f #'tmpl0 t* e*)])
(let-values ([(tmpl1 t* e*) (f #'tmpl1 t* e*)])
(values #`(#,tmpl0 . #,tmpl1) t* e*)))]
[atom (values #'atom t* e*)]))))
(define build-list
(lambda (body orig-level)
(let loop ([body body] [level orig-level])
(syntax-case body (unquote unquote-splicing)
[(tmpl0 ... (unquote e))
(with-syntax ([(tmpl0 ...) (rebuild-body #'(tmpl0 ...) (fx- orig-level 1))])
(cond
[(fx=? level 0) #'(tmpl0 ... (unquote e))]
[(fx=? level 1) #'(tmpl0 ... (unquote-splicing e))]
[else (let loop ([level level] [e #'e])
(if (fx=? level 1)
#`(tmpl0 ... (unquote-splicing #,e))
(loop (fx- level 1) #`(apply append #,e))))]))]
[(tmpl0 ... (unquote-splicing e))
(with-syntax ([(tmpl0 ...) (rebuild-body #'(tmpl0 ...) (fx- orig-level 1))])
(cond
[(fx=? level 0) #'(tmpl0 ... (unquote-splicing e))]
[else (let loop ([level level] [e #'e])
(if (fx=? level 0)
#`(tmpl0 ... (unquote-splicing #,e))
(loop (fx- level 1) #`(apply append #,e))))]))]
[(tmpl0 ... tmpl1 ellipsis)
(eq? (datum ellipsis) '...)
(loop #'(tmpl0 ... tmpl1) (fx+ level 1))]
[(tmpl0 ... tmpl1)
(with-syntax ([(tmpl0 ...) (rebuild-body #'(tmpl0 ...) (fx- orig-level 1))])
(let-values ([(tmpl1 t* e*) (gather-unquoted-exprs #'tmpl1)])
(when (null? e*)
(syntax-violation 'extended-quasiquote
"no variables found in ellipsis expression" body))
(let loop ([level level]
[e #`(map (lambda #,t*
(extended-quasiquote
#,tmpl1))
. #,e*)])
(if (fx=? level 1)
#`(tmpl0 ... (unquote-splicing #,e))
(loop (fx- level 1) #`(apply append #,e))))))]))))
(define rebuild-body
(lambda (body level)
(syntax-case body (unquote unquote-splicing)
[(unquote e) #'(unquote e)]
[(unquote-splicing e) #'(unquote-splicing e)]
[(tmpl0 ... tmpl1 ellipsis)
(eq? (datum ellipsis) '...)
(with-syntax ([(tmpl0 ...) (build-list #'(tmpl0 ... tmpl1) (fx+ level 1))])
#'(tmpl0 ...))]
[(tmpl0 ... tmpl1 ellipsis . tmpl2)
(eq? (datum ellipsis) '...)
(with-syntax ([(tmpl0 ...) (build-list #'(tmpl0 ... tmpl1) (fx+ level 1))]
[tmpl2 (rebuild-body #'tmpl2 level)])
#'(tmpl0 ... . tmpl2))]
[(tmpl0 ... tmpl1)
(with-syntax ([(tmpl0 ...) (rebuild-body #'(tmpl0 ...) level)]
[tmpl1 (rebuild-body #'tmpl1 level)])
#'(tmpl0 ... tmpl1))]
[(tmpl0 ... tmpl1 . tmpl2)
(with-syntax ([(tmpl0 ...) (rebuild-body #'(tmpl0 ... tmpl1) level)]
[tmpl2 (rebuild-body #'tmpl2 level)])
#'(tmpl0 ... . tmpl2))]
[other #'other])))
(syntax-case x ()
[(k body)
(with-syntax ([body (rebuild-body #'body 0)])
#'(quasiquote body))])))
(define-syntax with-extended-quasiquote
(lambda (x)
(syntax-case x ()
[(k . body)
(with-implicit (k quasiquote)
#'(let-syntax ([quasiquote (syntax-rules ()
[(_ x) (extended-quasiquote x)])])
. body))])))
(define-syntax with-auto-unquote
(lambda (x)
(syntax-case x ()
[(k (x* ...) . body)
(with-implicit (k quasiquote)
#'(let-syntax ([quasiquote
(lambda (x)
(define replace-vars
(let ([vars (list #'x* ...)])
(lambda (b)
(let f ([b b])
(syntax-case b ()
[id (identifier? #'id)
(if (memp (lambda (var) (free-identifier=? var #'id)) vars)
#'(unquote id)
#'id)]
[(a . d) (with-syntax ([a (f #'a)] [d (f #'d)]) #'(a . d))]
[atom #'atom])))))
(syntax-case x ()
[(_ b)
(with-syntax ([b (replace-vars #'b)])
#'`b)]))])
. body))])))
(define all-unique-identifiers?
(lambda (ls)
(and (for-all identifier? ls)
(let f ([ls ls])
(if (null? ls)
#t
(let ([id (car ls)] [ls (cdr ls)])
(and (not (memp (lambda (x) (free-identifier=? x id)) ls))
(f ls))))))))
(define-syntax with-values
(syntax-rules ()
[(_ p c) (call-with-values (lambda () p) c)]))
(define-syntax rec
(syntax-rules ()
[(_ name proc) (letrec ([name proc]) name)]
[(_ (name . arg) body body* ...)
(letrec ([name (lambda arg body body* ...)]) name)]))
(define-syntax define-auxiliary-keyword
(syntax-rules ()
[(_ name)
(define-syntax name
(lambda (x)
(syntax-violation 'name "misplaced use of auxiliary keyword" x)))]))
(define-syntax define-auxiliary-keywords
(syntax-rules ()
[(_ name* ...)
(begin (define-auxiliary-keyword name*) ...)]))
(define-auxiliary-keywords extends definitions entry terminals nongenerative-id maybe)
(define-syntax define-who
(lambda (x)
(syntax-case x ()
[(k name expr)
(with-implicit (k who)
#'(define name (let () (define who 'name) expr)))]
[(k (name . fmls) expr exprs ...)
#'(define-who name (lambda (fmls) expr exprs ...))])))
;;; moved from meta-syntax-dispatch.ss and nano-syntax-dispatch.ss
(define combine
(lambda (r* r)
(if (null? (car r*))
r
(cons (map car r*) (combine (map cdr r*) r)))))
;;; moved from meta-syntax-dispatch.ss and syntaxconvert.ss
(define ellipsis?
(lambda (x)
(and (identifier? x) (free-identifier=? x (syntax (... ...))))))
(define unquote?
(lambda (x)
(and (identifier? x) (free-identifier=? x (syntax unquote)))))
(define unquote-splicing?
(lambda (x)
(and (identifier? x) (free-identifier=? x (syntax unquote-splicing)))))
(define plus?
(lambda (x)
(and (identifier? x)
(or (free-identifier=? x #'+)
(eq? (syntax->datum x) '+)))))
(define minus?
(lambda (x)
(and (identifier? x)
(or (free-identifier=? x #'-)
(eq? (syntax->datum x) '-)))))
(define double-arrow?
(lambda (x)
(and (identifier? x)
(or (free-identifier=? x #'=>)
(eq? (syntax->datum x) '=>)))))
(define colon?
(lambda (x)
(and (identifier? x)
(or (free-identifier=? x #':)
(eq? (syntax->datum x) ':)))))
(define arrow?
(lambda (x)
(and (identifier? x)
(or (free-identifier=? x #'->)
(eq? (syntax->datum x) '->)))))
;;; unique-name produces a unique name derived the input name by
;;; adding a unique suffix of the form .<digit>+. creating a unique
;;; name from a unique name has the effect of replacing the old
;;; unique suffix with a new one.
(define unique-suffix
(let ((count 0))
(lambda ()
(set! count (+ count 1))
(number->string count))))
(define unique-name
(lambda (id . id*)
(string-append
(fold-right
(lambda (id str) (string-append str ":" (symbol->string (syntax->datum id))))
(symbol->string (syntax->datum id)) id*)
"."
(unique-suffix))))
; TODO: at some point we may want this to be a little bit more
; sophisticated, or we may want to have something like a regular
; expression style engine where we bail as soon as we can identify
; what the meta-var corresponds to.
(define meta-var->raw-meta-var
(lambda (sym)
(let ([s (symbol->string sym)])
(let f ([i (fx- (string-length s) 1)])
(cond
[(fx=? i -1) sym]
[(or (char=? #\* (string-ref s i))
(char=? #\^ (string-ref s i))
(char=? #\? (string-ref s i)))
(f (fx- i 1))]
[else (let f ([i i])
(cond
[(fx=? i -1) sym]
[(char-numeric? (string-ref s i)) (f (fx- i 1))]
[else (string->symbol (substring s 0 (fx+ i 1)))]))])))))
(define build-id
(lambda (who x x*)
(define ->str
(lambda (x)
(cond
[(string? x) x]
[(identifier? x) (symbol->string (syntax->datum x))]
[(symbol? x) (symbol->string x)]
[else (error who "invalid input ~s" x)])))
(apply string-append (->str x) (map ->str x*))))
(define $construct-id
(lambda (who str->sym tid x x*)
(unless (identifier? tid)
(error who "template argument ~s is not an identifier" tid))
(datum->syntax tid (str->sym (build-id who x x*)))))
(define-who construct-id
(lambda (tid x . x*)
($construct-id who string->symbol tid x x*)))
(define-who construct-unique-id
(lambda (tid x . x*)
($construct-id who gensym tid x x*)))
(define-syntax partition-syn
(lambda (x)
(syntax-case x ()
[(_ ls-expr () e0 e1 ...) #'(begin ls-expr e0 e1 ...)]
[(_ ls-expr ([set pred] ...) e0 e1 ...)
(with-syntax ([(pred ...)
(let f ([preds #'(pred ...)])
(if (null? (cdr preds))
(if (free-identifier=? (car preds) #'otherwise)
(list #'(lambda (x) #t))
preds)
(cons (car preds) (f (cdr preds)))))])
#'(let-values ([(set ...)
(let f ([ls ls-expr])
(if (null? ls)
(let ([set '()] ...) (values set ...))
(let-values ([(set ...) (f (cdr ls))])
(cond
[(pred (car ls))
(let ([set (cons (car ls) set)])
(values set ...))]
...
[else (error 'partition-syn
"no home for ~s"
(car ls))]))))])
e0 e1 ...))])))
(define gentemp
(lambda ()
(car (generate-temporaries '(#'t)))))
(define bound-id-member?
(lambda (id id*)
(and (not (null? id*))
(or (bound-identifier=? id (car id*))
(bound-id-member? id (cdr id*))))))
(define bound-id-union ; seems to be unneeded
(lambda (ls1 ls2)
(cond
[(null? ls1) ls2]
[(bound-id-member? (car ls1) ls2) (bound-id-union (cdr ls1) ls2)]
[else (cons (car ls1) (bound-id-union (cdr ls1) ls2))])))
(define syntax->source-info
(lambda (stx)
(let ([si (syntax->source-information stx)])
(and si
(cond
[(and (source-information-position-line si)
(source-information-position-column si))
(format "~s line ~s, char ~s of ~a"
(source-information-type si)
(source-information-position-line si)
(source-information-position-column si)
(source-information-source-file si))]
[(source-information-byte-offset-start si)
(format "~s byte position ~s of ~a"
(source-information-type si)
(source-information-byte-offset-start si)
(source-information-source-file si))]
[(source-information-char-offset-start si)
(format "~s character position ~s of ~a"
(source-information-type si)
(source-information-char-offset-start si)
(source-information-source-file si))]
[else (format "in ~a" (source-information-source-file si))]))))))
|