6ab65a30e3
Shaking the ring-app example's real library stack out against jolt surfaced a
batch of divergences from JVM Clojure, the biggest being evaluation order.
backend_scheme: call and recur arguments were emitted as bare Scheme operands,
so Chez's unspecified (right-to-left) order won out. Clojure evaluates left to
right, which selmer's reader loop relies on: (recur (add-node ... rdr) (read-char
rdr)) consumed a char early and dropped the first chars of every {{tag}}. Bind
operands to fresh temps in a let* (only when two or more can have side effects,
so hot calls over locals/consts stay un-wrapped). emit-ordered already did this
for collection literals; generalize it.
host-contract: syntax-quote now resolves the alias part of a qualified symbol
(impl/foo -> clojure.tools.logging.impl/foo) instead of leaving it bare, which
limped along via short-name matching until two loaded namespaces (reitit.impl,
clojure.tools.logging.impl) shared the short name and it broke.
collections: key-hash masks with bitwise-and, not fxand — jolt-hash is set!-
decorated per type (records return their own hash) and Chez's equal-hash can be a
bignum, so a key's hash isn't always a fixnum.
seq: even?/odd? handle bignums (JVM accepts any integer; the fxand crashed).
records: Keyword/Symbol .sym/.getName/.toString (honeysql's :clj branch reads
(.sym k)); Throwable .getMessage/.toString over a Chez condition.
host-static: __register-class-ctor!/__register-class-statics! so a host shim
(reitit.trie-jolt) can mirror a Java class.
natives-str: String.intern returns the string.
sqlite: jdbc.core fetch/fetch-one kebab-case column keys (the jolt-lang/db
convention; created_at -> :created-at).
io: a relative io/file path resolves against JOLT_PWD (the user's cwd), not the
repo root the launcher cd'd to — matches JVM cwd semantics, so config.edn loads.
cli: render an uncaught jolt throw (ex-info message + ex-data, or a condition)
instead of Chez's opaque "non-condition value" dump.
287 lines
14 KiB
Scheme
287 lines
14 KiB
Scheme
;; java.io.File + host file I/O (jolt-yyud). A
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;; Chez-native implementation over Chez's filesystem primitives. A File is a
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;; path-backed jfile record: (instance? java.io.File f) is true, str/slurp coerce
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;; it to its path, and the File method surface (getName/getPath/exists/
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;; isDirectory/isFile/listFiles) dispatches through record-method-dispatch.
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;;
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;; Provides make-file/file?/slurp/spit/flush/dir?/
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;; list-dir for the overlay file-seq (20-coll.clj), which calls __file?/__dir?/
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;; __list-dir + the .isDirectory/.listFiles/.isFile method surface.
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;;
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;; Reader/StringReader-coupled io (io/reader, line-seq over a file, .toURL,
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;; slurp over a reader) is deferred to jolt-at0a. Loaded LAST in rt.ss, after
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;; dot-forms.ss (so the jfile method arm wraps the fully-built dispatch) and
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;; natives-meta.ss / records.ss / printing.ss (jolt-type / instance-check /
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;; jolt-str-render-one, which it extends).
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(define-record-type jfile (fields path) (nongenerative jolt-jfile-v1))
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(define (jolt-file? x) (jfile? x))
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;; path string of any value: a jfile -> its path, else its str rendering.
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(define (file-path-of x) (if (jfile? x) (jfile-path x) (jolt-str-render-one x)))
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;; A user-facing relative path resolves against JOLT_PWD — the user's cwd before
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;; the launcher cd'd to the jolt repo root — matching the JVM, where io/file is
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;; cwd-relative. (io/resource builds jfiles from the source roots directly, so it
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;; isn't routed through here.)
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(define (project-relative p)
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(if (or (= (string-length p) 0) (char=? (string-ref p 0) #\/))
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p
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(let ((pwd (getenv "JOLT_PWD")))
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(if (and pwd (> (string-length pwd) 0)) (string-append pwd "/" p) p))))
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;; (io/file path) / (io/file parent child) — join children with "/".
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(define (jolt-make-file path . rest)
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(let loop ((p (project-relative (file-path-of path))) (cs rest))
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(if (null? cs) (make-jfile p)
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(loop (string-append p "/" (file-path-of (car cs))) (cdr cs)))))
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(define (path-last-segment p)
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(let loop ((i (- (string-length p) 1)))
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(cond ((< i 0) p)
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((char=? (string-ref p i) #\/) (substring p (+ i 1) (string-length p)))
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(else (loop (- i 1))))))
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;; directory children as full paths, sorted (the __list-dir seed primitive).
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(define (jolt-list-dir path)
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(let ((p (file-path-of path)))
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(map (lambda (e) (string-append p "/" e))
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(sort string<? (directory-list p)))))
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(define (jolt-dir? path) (if (file-directory? (file-path-of path)) #t #f))
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;; absolute path string (cwd-relative paths resolved against current-directory).
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(define (jfile-abs p)
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(if (and (> (string-length p) 0) (char=? (string-ref p 0) #\/)) p
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(string-append (current-directory) "/" p)))
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;; --- java.net.URL (a jhost "url", state #(spec)) ----------------------------
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;; A File.toURL value: .toString / .toExternalForm give the spec, .getPath /
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;; .getFile strip the "file:" scheme.
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(define (make-url spec) (make-jhost "url" (vector spec)))
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(define (url-spec u) (vector-ref (jhost-state u) 0))
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(define (url-strip-scheme spec)
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(if (and (>= (string-length spec) 5) (string=? (substring spec 0 5) "file:"))
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(substring spec 5 (string-length spec)) spec))
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(register-host-methods! "url"
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(list (cons "toString" (lambda (self) (url-spec self)))
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(cons "toExternalForm" (lambda (self) (url-spec self)))
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(cons "getPath" (lambda (self) (url-strip-scheme (url-spec self))))
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(cons "getFile" (lambda (self) (url-strip-scheme (url-spec self))))))
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;; --- File method surface (record-method-dispatch arm) -----------------------
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(define (jfile-method f name args) ; -> boxed result, or #f to fall through
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(let ((p (jfile-path f)))
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(cond
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((string=? name "getPath") (list p))
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((string=? name "getName") (list (path-last-segment p)))
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((string=? name "toString") (list p))
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((string=? name "getAbsolutePath")(list (jfile-abs p)))
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((string=? name "getCanonicalPath")(list (jfile-abs p)))
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((string=? name "toURI") (list (string-append "file:" (jfile-abs p))))
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((string=? name "toURL") (list (make-url (string-append "file:" (jfile-abs p)))))
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((string=? name "exists") (list (if (file-exists? p) #t #f)))
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((string=? name "isDirectory") (list (if (file-directory? p) #t #f)))
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((string=? name "isFile") (list (if (and (file-exists? p) (not (file-directory? p))) #t #f)))
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((string=? name "listFiles") (list (list->cseq (map make-jfile (jolt-list-dir p)))))
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((string=? name "getParent")
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(let loop ((i (- (string-length p) 1)))
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(cond ((< i 0) (list jolt-nil))
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((char=? (string-ref p i) #\/) (list (if (= i 0) "/" (substring p 0 i))))
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(else (loop (- i 1))))))
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(else #f))))
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(define %io-rmd record-method-dispatch)
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(set! record-method-dispatch
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(lambda (obj method-name rest-args)
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(if (jfile? obj)
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(let* ((rest (if (jolt-nil? rest-args) '() (seq->list rest-args)))
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(r (jfile-method obj method-name rest)))
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(if r (car r) (error #f "no File method" method-name)))
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(%io-rmd obj method-name rest-args))))
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;; .isDirectory / .listFiles emit to jolt-host-call (rt.ss), not record-method-
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;; dispatch — the Phase-1 shims there assume a
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;; path STRING target. Make them jfile-aware so file-seq's File branch works.
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(define %io-host-call jolt-host-call)
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(set! jolt-host-call
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(lambda (method target . args)
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(cond
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((and (jfile? target) (string=? method "isDirectory"))
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(if (file-directory? (jfile-path target)) #t #f))
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((and (jfile? target) (string=? method "listFiles"))
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(list->cseq (map make-jfile (jolt-list-dir target))))
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(else (apply %io-host-call method target args)))))
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;; --- slurp / spit / flush ---------------------------------------------------
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(define (read-file-string path)
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(let ((p (open-input-file path)))
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(let ((s (get-string-all p))) (close-port p) (if (eof-object? s) "" s))))
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;; Drain a jhost reader (StringReader / PushbackReader): read code units from the
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;; current position to EOF (-1) and assemble the string. Used by slurp; advances
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;; the reader, as on the JVM.
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(define (drain-reader r)
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(let loop ((acc '()))
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(let ((u (record-method-dispatch r "read" jolt-nil)))
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(if (or (jolt-nil? u) (and (number? u) (< u 0)))
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(list->string (reverse acc))
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(loop (cons (integer->char (exact (truncate u))) acc))))))
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(define (reader-jhost? x)
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(and (jhost? x) (member (jhost-tag x) '("string-reader" "pushback-reader"))))
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;; clojure.edn/read over a reader (jolt-uicd): the overlay edn.clj's drain-reader is
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;; janet/type-coupled, so on Chez we drain the jhost reader to a string and read the
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;; first EDN form (read-string). Re-asserted over the prelude in post-prelude.ss.
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(define (chez-edn-read reader)
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(jolt-invoke (var-deref "clojure.core" "read-string")
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(if (reader-jhost? reader) (drain-reader reader) (jolt-str-render-one reader))))
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;; line-seq (jolt-0obq): the overlay line-seq reads via a Janet map-reader's
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;; :read-line-fn, but a Chez io/reader is a jhost StringReader. Drain it (or take a
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;; string) and split on newline; a trailing newline does NOT yield a final empty
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;; line (like readLine -> nil at EOF). Re-asserted in post-prelude.ss.
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(define (chez-lines s)
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(let loop ((cs (string->list s)) (cur '()) (acc '()))
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(cond ((null? cs) (reverse (if (null? cur) acc (cons (list->string (reverse cur)) acc))))
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((char=? (car cs) #\newline) (loop (cdr cs) '() (cons (list->string (reverse cur)) acc)))
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(else (loop (cdr cs) (cons (car cs) cur) acc)))))
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(define (chez-line-seq rdr)
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(list->cseq (chez-lines (cond ((string? rdr) rdr)
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((reader-jhost? rdr) (drain-reader rdr))
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(else (jolt-str-render-one rdr))))))
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(define (jolt-slurp src . opts)
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(cond
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((jfile? src) (read-file-string (jfile-path src)))
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((reader-jhost? src) (drain-reader src))
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((string? src) (read-file-string src))
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(else (error #f "slurp: unsupported source" src))))
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(define (spit-append? opts)
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(let loop ((o opts))
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(cond ((or (null? o) (null? (cdr o))) #f)
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((and (keyword-t? (car o)) (string=? (keyword-t-name (car o)) "append")
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(jolt-truthy? (cadr o))) #t)
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(else (loop (cddr o))))))
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(define (jolt-spit path content . opts)
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(let* ((p (file-path-of path))
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(port (open-output-file p (if (spit-append? opts) 'append 'truncate))))
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(put-string port (jolt-str-render-one content))
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(close-port port)
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jolt-nil))
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(define (jolt-flush) (flush-output-port (current-output-port)) jolt-nil)
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;; --- str / type / instance? integration ------------------------------------
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;; str of a jfile is its path (Clojure's File.toString).
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(define %io-str-render jolt-str-render-one)
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(set! jolt-str-render-one
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(lambda (v) (if (jfile? v) (jfile-path v) (%io-str-render v))))
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;; (type f) -> :jolt/file (the tagged-file :jolt/type). Re-def-var!
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;; "type": natives-meta.ss already bound the var to the old jolt-type value, so the
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;; set! alone (which updates the symbol for internal callers) wouldn't reach it.
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(define io-kw-file (keyword "jolt" "file"))
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(define %io-type jolt-type)
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(set! jolt-type (lambda (x) (if (jfile? x) io-kw-file (%io-type x))))
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(def-var! "clojure.core" "type" jolt-type)
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;; (instance? java.io.File f): the instance? macro passes the class-name symbol;
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;; match "File" / "java.io.File" (and any *.File) against a jfile.
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(define %io-instance-check instance-check)
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(set! instance-check
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(lambda (type-sym val)
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(let ((tname (symbol-t-name type-sym)))
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(if (and (jfile? val)
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(or (string=? tname "File") (string=? tname "java.io.File")
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(string=? (path-last-segment tname) "File")))
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#t
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(%io-instance-check type-sym val)))))
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(def-var! "clojure.core" "instance-check" instance-check)
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;; --- def-var! the native names the overlay file-seq + str/slurp use ----
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(def-var! "clojure.core" "__make-file" jolt-make-file)
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(def-var! "clojure.core" "__file?" jolt-file?)
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(def-var! "clojure.core" "__dir?" jolt-dir?)
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(def-var! "clojure.core" "__list-dir" (lambda (p) (list->cseq (jolt-list-dir p))))
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(def-var! "clojure.core" "slurp" jolt-slurp)
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(def-var! "clojure.core" "spit" jolt-spit)
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(def-var! "clojure.core" "flush" jolt-flush)
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;; --- char-array: a seq of chars over a string (the JVM char[]). io/reader's
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;; char[] branch + selmer's (char-array template) feed on this.
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;; char-array (string -> chars). A leaf array native; lives here as io/reader
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;; is its only Chez consumer so far.
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(define (jolt-char-array a . rest)
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(cond
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((string? a) (list->cseq (string->list a)))
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((number? a) (list->cseq (make-list (exact (truncate a)) #\nul)))
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(else (list->cseq (map (lambda (c) (if (char? c) c (integer->char (exact (truncate c)))))
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(seq->list a))))))
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(def-var! "clojure.core" "char-array" jolt-char-array)
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;; --- with-open's close seam (__close): a map-like value closes via its :close
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;; fn; a jhost reader/writer/file via its .close method (a no-op here); anything
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;; else is an error.
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(define (jolt-close x)
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(cond
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((jolt-nil? x) jolt-nil)
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((and (jhost? x) (member (jhost-tag x) '("string-reader" "pushback-reader" "writer")))
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(record-method-dispatch x "close" jolt-nil) jolt-nil)
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((jfile? x) jolt-nil)
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(else
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(let ((closef (jolt-get x (keyword #f "close") jolt-nil)))
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(if (and (not (jolt-nil? closef)) (procedure? closef))
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(begin (jolt-invoke closef) jolt-nil)
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(error #f "with-open: don't know how to close" x))))))
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(def-var! "clojure.core" "__close" jolt-close)
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;; --- clojure.java.io/reader: an in-memory java.io.Reader over the source. An
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;; existing reader passes through; a File / path / URL is slurped; a char[] (or
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;; any seq) becomes a reader over (apply str …). Mirrors io.clj's reader. Returns
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;; a StringReader (host-static.ss jhost) so .read/.mark/.reset and slurp work.
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(define (seq-source->string x)
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(apply string-append (map jolt-str-render-one (seq->list x))))
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(define (jolt-io-reader x)
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(cond
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((reader-jhost? x) x)
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((jfile? x) (host-new "StringReader" (read-file-string (jfile-path x))))
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((and (jhost? x) (string=? (jhost-tag x) "url"))
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(host-new "StringReader" (read-file-string (url-strip-scheme (url-spec x)))))
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((string? x) (host-new "StringReader" (read-file-string x)))
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((or (cseq? x) (empty-list-t? x) (pvec? x))
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(host-new "StringReader" (seq-source->string x)))
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(else (host-new "StringReader" (jolt-str-render-one x)))))
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;; --- clojure.java.io/writer: an existing writer passes through; a File / path
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;; gets a file-backed writer (host-static.ss "file-writer") that persists on
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;; flush/close. Mirrors io.clj's writer over the host's StringWriter/file ports.
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(define (jolt-io-writer x)
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(cond
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((and (jhost? x) (string=? (jhost-tag x) "writer")) x)
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((and (jhost? x) (string=? (jhost-tag x) "file-writer")) x)
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((jfile? x) (make-jhost "file-writer" (vector (jfile-path x) "")))
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((string? x) (make-jhost "file-writer" (vector x "")))
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(else (error #f "io/writer: don't know how to create a writer from" x))))
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;; --- clojure.java.io ns -----------------------------------------------------
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(def-var! "clojure.java.io" "file" jolt-make-file)
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(def-var! "clojure.java.io" "as-file" (lambda (x) (if (jfile? x) x (make-jfile (file-path-of x)))))
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(def-var! "clojure.java.io" "reader" jolt-io-reader)
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(def-var! "clojure.java.io" "writer" jolt-io-writer)
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(def-var! "clojure.java.io" "input-stream" jolt-io-reader)
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(def-var! "clojure.java.io" "output-stream" jolt-io-writer)
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;; resource: jolt has no classpath, so a named resource is resolved against the
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;; loader's source roots (a project's :paths, e.g. "resources"). Returns a File
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;; (slurp/reader-able) for the first match, else nil. get-source-roots is the
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;; loader's accessor (loader.ss), resolved at call time — the runtime CLI loads it.
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(define (jolt-io-resource name)
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(let ((nm (jolt-str-render-one name)))
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(let loop ((roots (get-source-roots)))
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(cond ((null? roots) jolt-nil)
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((file-exists? (string-append (car roots) "/" nm)) (make-jfile (string-append (car roots) "/" nm)))
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(else (loop (cdr roots)))))))
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(def-var! "clojure.java.io" "resource" jolt-io-resource)
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(def-var! "clojure.java.io" "as-url" (lambda (x) (if (and (jhost? x) (string=? (jhost-tag x) "url")) x (make-url (jolt-str-render-one x)))))
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