2de0543613
Reader / loader:
- #?@ splicing reader conditionals now actually splice the matched collection's
items into the enclosing sequence; the splice flag was read but ignored, so a
binding vector like [a #?@(:clj [b (.foo b)])] lost its alignment.
- the file loader reads by position and skips a top-level form that reads as
nothing (a :cljs-only #?, a #_ discard, a trailing comment) instead of
treating it as EOF — which silently dropped the rest of a large .cljc file.
- jolt's reader feature set now includes :clj (was {:jolt :default}). jolt is a
Clojure/JVM-compatible host that emulates clojure.lang.* and java.* interop,
so it reads the :clj branch of a .cljc library, not :cljs. This also lets four
more reader-conditional corpus cases pass (floor 2726 -> 2730).
Backend:
- munge-name escapes ' (prime) -> _PRIME_; a Clojure symbol like f' otherwise
emitted a bare ' into Scheme, which is the quote reader macro and unbalanced
the output.
Host shims:
- clojure.java.io/writer (pass through a StringWriter, file-back a path) and a
readLine on the string reader, so line-seq over (io/reader …) works (markdown).
A better "unsupported destructuring pattern: <pat>" error message.
550 lines
27 KiB
Scheme
550 lines
27 KiB
Scheme
;; Chez-side Clojure data reader (jolt-r8ku, inc Y).
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;;
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;; The data half of runtime read/eval: a recursive-descent reader that parses
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;; ONE Clojure form off a string and produces jolt runtime values
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;; (the analyzer/eval half — eval, load-string,
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;; runtime defmacro — stays Phase-3, it needs the compiler at runtime). Two host
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;; seams hang off it:
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;; read-string : string -> first form (clojure.core seam, src 772)
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;; __parse-next : string -> [form rest] | nil (the *in* family seam, src 801)
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;; read / read+string / with-in-str / line-seq / clojure.edn are Clojure over
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;; these (jolt-core/clojure/core/50-io.clj, src/jolt/clojure/edn.clj).
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;;
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;; Form shapes:
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;; sets -> {:jolt/type :jolt/set :value [...]} (a FORM, not a set)
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;; #tag frm -> {:jolt/type :jolt/tagged :tag :#tag :form ...} (NO data reader)
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;; #"src" -> {:jolt/type :jolt/tagged :tag :regex :form "src"}
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;; 'x `x ~x ~@x @x -> (quote x)/(syntax-quote x)/(unquote x)/
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;; (unquote-splicing x)/(clojure.core/deref x)
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;; ^meta sym -> symbol carrying meta ({:tag "Name"} | {:kw true} | the map)
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;; read-string of blank / comment-only input is nil (the documented seed wart),
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;; NOT an EOF throw.
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;; Reader forms reuse these interned keywords for their tag structure.
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(define rdr-kw-jolt-type (keyword "jolt" "type"))
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(define rdr-kw-jolt-set (keyword "jolt" "set"))
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(define rdr-kw-jolt-tagged (keyword "jolt" "tagged"))
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(define rdr-kw-value (keyword #f "value"))
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(define rdr-kw-tag (keyword #f "tag"))
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(define rdr-kw-form (keyword #f "form"))
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;; A unique sentinel meaning "no form here" (EOF, or a close delimiter that the
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;; caller — read-seq — must consume). Never a legal jolt value, so unambiguous.
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(define rdr-eof (list 'reader-eof))
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(define (rdr-eof? x) (eq? x rdr-eof))
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;; A splicing reader conditional #?@(...) yields this wrapper; the enclosing
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;; sequence reader splices its items in place (never a legal jolt value).
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(define-record-type rdr-splice-t (fields items) (nongenerative rdr-splice-v1))
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(define (rdr-ws? c)
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(or (char-whitespace? c) (char=? c #\,)))
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;; `'` (apostrophe) is a NON-terminating macro char in Clojure (isTerminatingMacro
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;; is false for it), so it's a valid symbol constituent after the first char:
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;; inc'/+'/foo' read as single symbols. A LEADING ' still dispatches as quote
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;; (handled before token reading begins). Omit it from the terminator set.
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(define (rdr-terminator? c)
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(or (rdr-ws? c)
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(memv c '(#\( #\) #\[ #\] #\{ #\} #\" #\; #\@ #\^ #\` #\~ #\\))))
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(define (rdr-digit? c) (and (char>=? c #\0) (char<=? c #\9)))
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;; Advance past whitespace, commas, and ;-to-end-of-line comments.
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(define (rdr-skip-ws s i end)
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(let loop ((i i))
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(cond
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((>= i end) i)
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((rdr-ws? (string-ref s i)) (loop (+ i 1)))
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((char=? (string-ref s i) #\;)
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(let eol ((j (+ i 1)))
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(if (or (>= j end) (char=? (string-ref s j) #\newline))
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(loop j)
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(eol (+ j 1)))))
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(else i))))
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;; --- numbers ----------------------------------------------------------------
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;; A token is a number iff it (after an optional sign) starts with a digit and
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;; parses. Ratios and big-N/M decimals use all-double rendering
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;; for division; ints/bignums stay exact (Chez's tower IS Clojure's).
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(define (rdr-string-index-char str c)
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(let ((n (string-length str)))
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(let loop ((i 0))
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(cond ((>= i n) #f)
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((char=? (string-ref str i) c) i)
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(else (loop (+ i 1)))))))
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;; jolt models EVERY number as a double (emit-const lowers integer literals to
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;; flonums too), so the reader coerces every parsed number to inexact — else a
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;; read int (exact) is not jolt= to a source int literal (flonum).
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;; Numeric tower (JVM parity): integer literals read as exact integers (= Long/
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;; BigInt, arbitrary precision), a/b ratios as exact rationals (= Ratio), and
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;; decimal/exponent literals as flonums (= double).
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(define (rdr-try-number tok)
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(rdr-try-number-raw tok))
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(define (rdr-try-number-raw tok)
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(let ((len (string-length tok)))
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(and (> len 0)
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(let* ((c0 (string-ref tok 0))
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(signed (or (char=? c0 #\+) (char=? c0 #\-)))
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(start (if signed 1 0)))
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(and (> len start)
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(rdr-digit? (string-ref tok start))
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(rdr-number-body tok start signed c0))))))
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;; parse DDD in base `radix` (2..36); #f on a bad digit. Scheme string->number only
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;; does radix 2/8/10/16, so Clojure's NrDDD (e.g. 36rZ) needs a manual parse.
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(define (rdr-parse-radix digits radix)
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(let ((len (string-length digits)))
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(and (> len 0)
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(let loop ((i 0) (acc 0))
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(if (>= i len)
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acc
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(let* ((c (char-downcase (string-ref digits i)))
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(d (cond ((and (char>=? c #\0) (char<=? c #\9)) (- (char->integer c) 48))
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((and (char>=? c #\a) (char<=? c #\z)) (+ 10 (- (char->integer c) 97)))
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(else #f))))
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(and d (< d radix) (loop (+ i 1) (+ (* acc radix) d)))))))))
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(define (rdr-number-body tok start signed sign-ch)
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(let* ((sign (if (and signed (char=? sign-ch #\-)) -1 1))
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(len (string-length tok))
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(body (substring tok start len))
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(blen (string-length body))
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(slash (rdr-string-index-char body #\/)))
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(cond
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;; ratio a/b -> exact rational (= JVM Ratio); reduces to an exact integer
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;; when d divides n.
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(slash
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(let ((n (string->number (substring body 0 slash)))
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(d (string->number (substring body (+ slash 1) blen))))
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(and (integer? n) (integer? d) (not (= d 0))
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(* sign (/ n d)))))
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;; hex 0x..
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((and (>= blen 2) (char=? (string-ref body 0) #\0)
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(or (char=? (string-ref body 1) #\x) (char=? (string-ref body 1) #\X)))
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(let ((h (string->number (substring body 2 blen) 16)))
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(and h (* sign h))))
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;; radix NrDDD (Clojure 2r1010 / 16rFF / 36rZ): N in decimal, DDD in base N
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((let ((ri (or (rdr-string-index-char body #\r) (rdr-string-index-char body #\R))))
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(and ri (> ri 0) (< (+ ri 1) blen) ri))
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=> (lambda (ri)
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(let ((radix (string->number (substring body 0 ri))))
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(and radix (integer? radix) (>= radix 2) (<= radix 36)
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(let ((v (rdr-parse-radix (substring body (+ ri 1) blen) radix)))
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(and v (* sign v)))))))
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;; bigint suffix N
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((and (> blen 1) (char=? (string-ref body (- blen 1)) #\N))
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(let ((n (string->number (substring body 0 (- blen 1)))))
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(and n (integer? n) (* sign n))))
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;; bigdecimal suffix M -> a :bigdec form carrying the numeric text; the back
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;; end lowers it to a runtime jbigdec (jolt-i2jm).
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((and (> blen 1) (char=? (string-ref body (- blen 1)) #\M))
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(let ((n (string->number (substring body 0 (- blen 1)))))
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(and n (real? n)
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(rdr-make-tagged (keyword #f "bigdec") (substring tok 0 (- len 1))))))
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(else
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(let ((n (string->number tok))) ; tok carries its own sign
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;; keep exactness: "42" -> exact int, "3.14"/"1e3" -> flonum.
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(and (number? n) (real? n) n))))))
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;; --- string / char literals -------------------------------------------------
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(define (rdr-hex->int s i n) ; n hex digits at i -> (values int j)
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(let loop ((k 0) (acc 0) (j i))
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(if (= k n)
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(values acc j)
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(loop (+ k 1) (+ (* acc 16) (rdr-hexdigit (string-ref s j))) (+ j 1)))))
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(define (rdr-hexdigit c)
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(cond ((and (char>=? c #\0) (char<=? c #\9)) (- (char->integer c) 48))
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((and (char>=? c #\a) (char<=? c #\f)) (+ 10 (- (char->integer c) 97)))
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((and (char>=? c #\A) (char<=? c #\F)) (+ 10 (- (char->integer c) 65)))
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(else (error 'reader "bad hex digit" c))))
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;; opening quote already consumed; read to the closing quote, processing escapes.
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(define (rdr-read-string-lit s i end)
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(let loop ((i i) (acc '()))
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(when (>= i end) (jolt-throw (jolt-ex-info "EOF while reading string" (empty-pmap))))
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(let ((c (string-ref s i)))
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(cond
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((char=? c #\") (values (list->string (reverse acc)) (+ i 1)))
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((char=? c #\\)
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(let ((e (string-ref s (+ i 1))))
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(case e
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((#\n) (loop (+ i 2) (cons #\newline acc)))
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((#\t) (loop (+ i 2) (cons #\tab acc)))
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((#\r) (loop (+ i 2) (cons #\return acc)))
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((#\\) (loop (+ i 2) (cons #\\ acc)))
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((#\") (loop (+ i 2) (cons #\" acc)))
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((#\b) (loop (+ i 2) (cons #\backspace acc)))
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((#\f) (loop (+ i 2) (cons #\page acc)))
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((#\0) (loop (+ i 2) (cons #\nul acc)))
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((#\u)
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(let-values (((cp j) (rdr-hex->int s (+ i 2) 4)))
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(loop j (cons (integer->char cp) acc))))
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(else (loop (+ i 2) (cons e acc))))))
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(else (loop (+ i 1) (cons c acc)))))))
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;; backslash already consumed; read a Clojure character literal.
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(define (rdr-read-char s i end)
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(when (>= i end) (jolt-throw (jolt-ex-info "EOF while reading char" (empty-pmap))))
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(let ((c0 (string-ref s i)))
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(if (char-alphabetic? c0)
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;; named / unicode / single-letter: collect the alnum run
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(let loop ((j (+ i 1)))
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(if (and (< j end)
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(let ((c (string-ref s j)))
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(or (char-alphabetic? c) (char-numeric? c))))
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(loop (+ j 1))
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(let ((name (substring s i j)))
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(if (= (string-length name) 1)
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(values c0 j)
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(values (rdr-named-char name) j)))))
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;; any other single char (\( \\ \; \space-as-symbol handled above)
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(values c0 (+ i 1)))))
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(define (rdr-named-char name)
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(cond
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((string=? name "newline") #\newline)
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((string=? name "space") #\space)
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((string=? name "tab") #\tab)
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((string=? name "return") #\return)
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((string=? name "backspace") #\backspace)
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((string=? name "formfeed") #\page)
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((char=? (string-ref name 0) #\u)
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(integer->char (string->number (substring name 1 (string-length name)) 16)))
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((char=? (string-ref name 0) #\o)
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(integer->char (string->number (substring name 1 (string-length name)) 8)))
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(else (jolt-throw (jolt-ex-info (string-append "Unsupported character: \\" name)
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(empty-pmap))))))
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;; --- token (symbol / keyword / number / nil|true|false) ---------------------
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(define (rdr-read-token s i end)
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(let loop ((j i))
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(if (and (< j end) (not (rdr-terminator? (string-ref s j))))
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(loop (+ j 1))
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(values (substring s i j) j))))
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;; split a "ns/name" token on the FIRST slash (a lone "/" is name "/")
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(define (rdr-sym-parts tok)
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(let ((slash (rdr-string-index-char tok #\/)))
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(if (or (not slash) (= (string-length tok) 1) (= slash 0))
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(values #f tok)
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(values (substring tok 0 slash) (substring tok (+ slash 1) (string-length tok))))))
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(define (rdr-token->value tok)
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(let ((n (rdr-try-number tok)))
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(cond
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(n n)
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((string=? tok "nil") jolt-nil)
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((string=? tok "true") #t)
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((string=? tok "false") #f)
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(else (let-values (((ns name) (rdr-sym-parts tok))) (jolt-symbol ns name))))))
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;; --- collections ------------------------------------------------------------
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;; Read forms until the close delimiter; returns (values reversed?-no list j).
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(define (rdr-read-seq s i end close)
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(let loop ((i i) (acc '()))
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(let ((i (rdr-skip-ws s i end)))
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(cond
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((>= i end) (jolt-throw (jolt-ex-info "EOF while reading" (empty-pmap))))
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((char=? (string-ref s i) close) (values (reverse acc) (+ i 1)))
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(else
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(let-values (((form j) (rdr-read-form s i end)))
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(cond
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((rdr-eof? form) (loop j acc)) ; a #_ discard or no-match #? — re-check at j
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((rdr-splice-t? form) ; #?@ — splice the matched collection's items
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(loop j (append (reverse (rdr-splice-t-items form)) acc)))
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(else (loop j (cons form acc))))))))))
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;; Map literals must preserve SOURCE key order so the analyzer emits the value
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;; expressions in source order (Clojure guarantees left-to-right map-literal eval).
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;; A pmap is hash-ordered, so record each reader-built map's (k1 v1 k2 v2 ...) form
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;; sequence in a weak side-table the host contract's form-map-pairs consults.
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(define rdr-map-order (make-weak-eq-hashtable))
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(define (rdr-make-map es)
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(let ((m (apply jolt-hash-map es)))
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(when (pair? es) (hashtable-set! rdr-map-order m es))
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m))
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(define (rdr-make-set elems)
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(jolt-hash-map rdr-kw-jolt-type rdr-kw-jolt-set
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rdr-kw-value (apply jolt-vector elems)))
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(define (rdr-make-tagged tag form)
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(jolt-hash-map rdr-kw-jolt-type rdr-kw-jolt-tagged
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rdr-kw-tag tag rdr-kw-form form))
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;; --- metadata ---------------------------------------------------------------
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(define (rdr-meta-map m)
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(cond
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((keyword? m) (jolt-hash-map m #t))
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((symbol-t? m) (jolt-hash-map rdr-kw-tag (symbol-t-name m)))
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((string? m) (jolt-hash-map rdr-kw-tag m))
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((pmap? m) m)
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(else (jolt-hash-map rdr-kw-tag m))))
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(define (rdr-merge-meta old new)
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(if (pmap? old)
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(pmap-fold new (lambda (k v acc) (jolt-assoc1 acc k v)) old)
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new))
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(define (rdr-attach-meta target meta)
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(cond
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((symbol-t? target)
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(make-symbol-t (symbol-t-ns target) (symbol-t-name target)
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(rdr-merge-meta (symbol-t-meta target) meta)))
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;; A LIST form is code: ^Type (expr) is a compile-time hint on the FORM, not a
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;; runtime operation. Attach the metadata to the form itself (so a quoted list
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;; keeps it and the analyzer can read :tag) — never lower to a runtime
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;; (with-meta (expr) meta), which would mis-apply the hint to the call's RESULT
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;; and throw when that result is a string/number (e.g. ^String (to-str x)).
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;; Matches Clojure: a tag hint on an evaluated form is discarded at runtime.
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((cseq? target) (jolt-with-meta target meta))
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((empty-list-t? target) target)
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;; A vector/map/set LITERAL: Clojure attaches the metadata to the runtime value
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;; ((meta ^{:tag :int} [1 2]) / ^:foo {}), so lower to a runtime (with-meta form
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;; meta). Use the BARE `with-meta` symbol (ns #f) — the fn/defn macros unwrap a
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;; (with-meta <arglist-vec> _) return-hint by matching the unqualified head, so a
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;; qualified clojure.core/with-meta would slip past them (^bytes [b]).
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(else (jolt-list (jolt-symbol #f "with-meta") target meta))))
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;; --- # dispatch -------------------------------------------------------------
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;; #(...) anonymous fn shorthand (jolt-qjr0): % -> p1, %N -> pN, %& -> rest. The
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;; fixed arity is the MAX positional used (Clojure: #(do %2 %&) -> [p1 p2 & rest]).
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;; Param names carry a trailing "#" so a #() inside a syntax-quote still reads them
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;; as auto-gensyms.
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(define rdr-anon-counter 0)
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(define (rdr-anon-gensym)
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(set! rdr-anon-counter (+ rdr-anon-counter 1))
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(jolt-symbol #f (string-append "p__" (number->string rdr-anon-counter) "#")))
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(define (rdr-pct-index nm) ; % ->1, %& ->'rest, %N ->N, else #f
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(cond ((string=? nm "%") 1)
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((string=? nm "%&") 'rest)
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((and (> (string-length nm) 1) (char=? (string-ref nm 0) #\%))
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(let ((n (string->number (substring nm 1 (string-length nm)))))
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(if (and n (integer? n) (>= n 1)) n #f)))
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(else #f)))
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(define (rdr-anon-set? f) (and (pmap? f) (eq? (jolt-get f rdr-kw-jolt-type) rdr-kw-jolt-set)))
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(define (rdr-anon-scan f max-box rest-box)
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(cond
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((symbol-t? f)
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(let ((idx (rdr-pct-index (symbol-t-name f))))
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(cond ((eq? idx 'rest) (set-box! rest-box #t))
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((and idx (> idx (unbox max-box))) (set-box! max-box idx)))))
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((or (pvec? f) (cseq? f) (empty-list-t? f))
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(for-each (lambda (x) (rdr-anon-scan x max-box rest-box)) (seq->list f)))
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((rdr-anon-set? f)
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(for-each (lambda (x) (rdr-anon-scan x max-box rest-box)) (seq->list (jolt-get f rdr-kw-value))))
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((pmap? f)
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(for-each (lambda (x) (rdr-anon-scan x max-box rest-box)) (or (hashtable-ref rdr-map-order f #f) '())))))
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(define (rdr-anon-replace f slots rest-sym)
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(cond
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((symbol-t? f)
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(let ((idx (rdr-pct-index (symbol-t-name f))))
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(cond ((eq? idx 'rest) rest-sym) (idx (vector-ref slots (- idx 1))) (else f))))
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((pvec? f) (apply jolt-vector (map (lambda (x) (rdr-anon-replace x slots rest-sym)) (seq->list f))))
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((or (cseq? f) (empty-list-t? f))
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|
(apply jolt-list (map (lambda (x) (rdr-anon-replace x slots rest-sym)) (seq->list f))))
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|
((rdr-anon-set? f)
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|
(rdr-make-set (map (lambda (x) (rdr-anon-replace x slots rest-sym)) (seq->list (jolt-get f rdr-kw-value)))))
|
|
((pmap? f)
|
|
(let ((kv (hashtable-ref rdr-map-order f #f)))
|
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(if kv (rdr-make-map (map (lambda (x) (rdr-anon-replace x slots rest-sym)) kv)) f)))
|
|
(else f)))
|
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(define (rdr-read-anon-fn s i end) ; i at the '(' after '#'
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(let-values (((form j) (rdr-read-form s i end)))
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(let ((max-box (box 0)) (rest-box (box #f)))
|
|
(rdr-anon-scan form max-box rest-box)
|
|
(let* ((n (unbox max-box))
|
|
(slots (make-vector n)))
|
|
(let loop ((k 0)) (when (< k n) (vector-set! slots k (rdr-anon-gensym)) (loop (+ k 1))))
|
|
(let* ((rest-sym (if (unbox rest-box) (rdr-anon-gensym) #f))
|
|
(body (rdr-anon-replace form slots rest-sym))
|
|
(params (append (vector->list slots)
|
|
(if rest-sym (list (jolt-symbol #f "&") rest-sym) '()))))
|
|
(values (jolt-list (jolt-symbol #f "fn*") (apply jolt-vector params) body) j))))))
|
|
|
|
;; reader conditionals (jolt-qjr0): jolt's feature set is {:jolt :clj :default};
|
|
;; the FIRST clause whose feature key is in the set wins (clause order, like
|
|
;; Clojure). jolt is a Clojure/JVM-compatible host — it emulates clojure.lang.*
|
|
;; and java.* interop — so it reads the :clj branch of a .cljc library (the JVM
|
|
;; code path its host shims target), not the :cljs one. A library can still
|
|
;; override with a :jolt-specific branch (place it before :clj).
|
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(define rdr-features '("jolt" "clj" "default"))
|
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(define (rdr-feature? kw)
|
|
(and (keyword? kw) (jolt-nil? (let ((n (keyword-t-ns kw))) (if n n jolt-nil)))
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|
(and (member (keyword-t-name kw) rdr-features) #t)))
|
|
(define (rdr-read-reader-cond s i end) ; i is past the '?'
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|
(let* ((splice (and (< i end) (char=? (string-ref s i) #\@)))
|
|
(start (if splice (+ i 1) i)))
|
|
(let-values (((form j) (rdr-read-form s start end)))
|
|
(when (rdr-eof? form) (jolt-throw (jolt-ex-info "EOF after #?" (empty-pmap))))
|
|
(let ((items (cond ((pvec? form) (seq->list form))
|
|
((or (cseq? form) (empty-list-t? form)) (seq->list form))
|
|
(else '()))))
|
|
(let loop ((xs items))
|
|
(cond ((or (null? xs) (null? (cdr xs))) (values rdr-eof j)) ; no match -> discard
|
|
((rdr-feature? (car xs))
|
|
(if splice
|
|
;; #?@ — the matched value is a collection whose ITEMS splice
|
|
;; into the enclosing sequence (read-seq expands the wrapper).
|
|
(let ((v (cadr xs)))
|
|
(values (make-rdr-splice-t
|
|
(cond ((pvec? v) (seq->list v))
|
|
((or (cseq? v) (empty-list-t? v)) (seq->list v))
|
|
(else (list v))))
|
|
j))
|
|
(values (cadr xs) j)))
|
|
(else (loop (cddr xs)))))))))
|
|
|
|
(define (rdr-read-dispatch s i end) ; i points just past the '#'
|
|
(when (>= i end) (jolt-throw (jolt-ex-info "EOF after #" (empty-pmap))))
|
|
(let ((c (string-ref s i)))
|
|
(cond
|
|
((char=? c #\{) ; #{...} set
|
|
(let-values (((elems j) (rdr-read-seq s (+ i 1) end #\})))
|
|
(values (rdr-make-set elems) j)))
|
|
((char=? c #\() ; #(...) anonymous fn shorthand
|
|
(rdr-read-anon-fn s i end))
|
|
((char=? c #\") ; #"..." regex -> tagged :regex (raw source)
|
|
(let-values (((src j) (rdr-read-regex s (+ i 1) end)))
|
|
(values (rdr-make-tagged (keyword #f "regex") src) j)))
|
|
((char=? c #\_) ; #_ discard the next form
|
|
(let-values (((_ j) (rdr-read-form s (+ i 1) end)))
|
|
(when (rdr-eof? _) (jolt-throw (jolt-ex-info "EOF after #_" (empty-pmap))))
|
|
(rdr-read-form s j end)))
|
|
((char=? c #\') ; #'x var-quote -> (var x)
|
|
(let-values (((form j) (rdr-read-form s (+ i 1) end)))
|
|
(values (jolt-list (jolt-symbol #f "var") form) j)))
|
|
((char=? c #\^) ; #^meta — deprecated metadata syntax = ^meta
|
|
(let-values (((mform j) (rdr-read-form s (+ i 1) end)))
|
|
(let-values (((target k) (rdr-read-form s j end)))
|
|
(when (rdr-eof? target)
|
|
(jolt-throw (jolt-ex-info "EOF after #^meta" (empty-pmap))))
|
|
(values (rdr-attach-meta target (rdr-meta-map mform)) k))))
|
|
((char=? c #\#) ; ## symbolic value: ##Inf / ##-Inf / ##NaN
|
|
(let-values (((tok j) (rdr-read-token s (+ i 1) end)))
|
|
(values (cond ((string=? tok "Inf") +inf.0)
|
|
((string=? tok "-Inf") -inf.0)
|
|
((string=? tok "NaN") +nan.0)
|
|
(else (jolt-throw (jolt-ex-info (string-append "unknown ## literal: " tok)
|
|
(empty-pmap)))))
|
|
j)))
|
|
((char=? c #\?) ; #?(...) / #?@(...) reader conditional
|
|
(rdr-read-reader-cond s (+ i 1) end))
|
|
(else ; #tag form -> tagged {:tag :#tag :form ...}
|
|
(let-values (((tok j) (rdr-read-token s i end)))
|
|
(let-values (((form k) (rdr-read-form s j end)))
|
|
(when (rdr-eof? form) (jolt-throw (jolt-ex-info "EOF after #tag" (empty-pmap))))
|
|
(values (rdr-make-tagged (keyword #f (string-append "#" tok)) form) k)))))))
|
|
|
|
;; regex literal source: raw chars to the closing quote; \" is an escaped quote,
|
|
;; every other backslash sequence is kept verbatim (regex engine semantics).
|
|
(define (rdr-read-regex s i end)
|
|
(let loop ((i i) (acc '()))
|
|
(when (>= i end) (jolt-throw (jolt-ex-info "EOF while reading regex" (empty-pmap))))
|
|
(let ((c (string-ref s i)))
|
|
(cond
|
|
((char=? c #\") (values (list->string (reverse acc)) (+ i 1)))
|
|
((and (char=? c #\\) (< (+ i 1) end) (char=? (string-ref s (+ i 1)) #\"))
|
|
(loop (+ i 2) (cons #\" acc)))
|
|
((char=? c #\\)
|
|
(loop (+ i 2) (cons (string-ref s (+ i 1)) (cons #\\ acc))))
|
|
(else (loop (+ i 1) (cons c acc)))))))
|
|
|
|
;; --- keyword ----------------------------------------------------------------
|
|
(define (rdr-read-keyword s i end) ; i points just past the leading ':'
|
|
;; ::kw auto-resolves; drop the ns, so skip a second ':'
|
|
(let ((i (if (and (< i end) (char=? (string-ref s i) #\:)) (+ i 1) i)))
|
|
(let-values (((tok j) (rdr-read-token s i end)))
|
|
(let-values (((ns name) (rdr-sym-parts tok)))
|
|
(values (keyword ns name) j)))))
|
|
|
|
;; --- the main dispatch ------------------------------------------------------
|
|
;; Returns (values form j). form is rdr-eof at end-of-input or at an unconsumed
|
|
;; close delimiter (read-seq consumes the close itself).
|
|
(define (rdr-read-form s i end)
|
|
(let ((i (rdr-skip-ws s i end)))
|
|
(if (>= i end)
|
|
(values rdr-eof i)
|
|
(let ((c (string-ref s i)))
|
|
(cond
|
|
((char=? c #\() (let-values (((es j) (rdr-read-seq s (+ i 1) end #\))))
|
|
(values (apply jolt-list es) j)))
|
|
((char=? c #\[) (let-values (((es j) (rdr-read-seq s (+ i 1) end #\])))
|
|
(values (apply jolt-vector es) j)))
|
|
((char=? c #\{) (let-values (((es j) (rdr-read-seq s (+ i 1) end #\})))
|
|
(values (rdr-make-map es) j)))
|
|
((or (char=? c #\)) (char=? c #\]) (char=? c #\}))
|
|
(values rdr-eof i)) ; unconsumed close — read-seq handles it
|
|
((char=? c #\") (rdr-read-string-lit s (+ i 1) end))
|
|
((char=? c #\\) (rdr-read-char s (+ i 1) end))
|
|
((char=? c #\:) (rdr-read-keyword s (+ i 1) end))
|
|
((char=? c #\#) (rdr-read-dispatch s (+ i 1) end))
|
|
((char=? c #\') (rdr-wrap s (+ i 1) end (jolt-symbol #f "quote")))
|
|
;; syntax-quote of a self-evaluating literal collapses to the literal at
|
|
;; READ time (Clojure's reader), so nested backticks over a literal are
|
|
;; inert: ``42 reads as 42, ```"meow" as "meow".
|
|
((char=? c #\`)
|
|
(let-values (((form j) (rdr-read-form s (+ i 1) end)))
|
|
(when (rdr-eof? form) (jolt-throw (jolt-ex-info "EOF after `" (empty-pmap))))
|
|
(values (if (rdr-self-eval-literal? form)
|
|
form
|
|
(jolt-list (jolt-symbol #f "syntax-quote") form))
|
|
j)))
|
|
((char=? c #\@) (rdr-wrap s (+ i 1) end (jolt-symbol "clojure.core" "deref")))
|
|
((char=? c #\~)
|
|
(if (and (< (+ i 1) end) (char=? (string-ref s (+ i 1)) #\@))
|
|
(rdr-wrap s (+ i 2) end (jolt-symbol #f "unquote-splicing"))
|
|
(rdr-wrap s (+ i 1) end (jolt-symbol #f "unquote"))))
|
|
((char=? c #\^)
|
|
(let-values (((mform j) (rdr-read-form s (+ i 1) end)))
|
|
(let-values (((target k) (rdr-read-form s j end)))
|
|
(when (rdr-eof? target)
|
|
(jolt-throw (jolt-ex-info "EOF after ^meta" (empty-pmap))))
|
|
(values (rdr-attach-meta target (rdr-meta-map mform)) k))))
|
|
(else
|
|
(let-values (((tok j) (rdr-read-token s i end)))
|
|
(values (rdr-token->value tok) j))))))))
|
|
|
|
;; wrap the next form in a 2-element list (READER-MACRO form)
|
|
;; self-evaluating literals (NOT symbols/collections) — syntax-quote passes these
|
|
;; through unchanged, collapsed at read time.
|
|
(define (rdr-self-eval-literal? x)
|
|
(or (jolt-nil? x) (boolean? x) (number? x) (string? x) (keyword? x) (char? x)))
|
|
|
|
(define (rdr-wrap s i end head)
|
|
(let-values (((form j) (rdr-read-form s i end)))
|
|
(when (rdr-eof? form)
|
|
(jolt-throw (jolt-ex-info "EOF while reading reader macro" (empty-pmap))))
|
|
(values (jolt-list head form) j)))
|
|
|
|
;; --- the two host seams -----------------------------------------------------
|
|
;; clojure.core/read-string: first form, or nil for blank / comment-only input
|
|
;; (parse-string wart, matched deliberately).
|
|
(define (jolt-read-string s)
|
|
(let-values (((form j) (rdr-read-form s 0 (string-length s))))
|
|
(if (rdr-eof? form) jolt-nil form)))
|
|
|
|
;; __parse-next: [form rest-of-string] or nil when only whitespace/comments left.
|
|
(define (jolt-parse-next s)
|
|
(let ((end (string-length s)))
|
|
(let-values (((form j) (rdr-read-form s 0 end)))
|
|
(if (rdr-eof? form)
|
|
jolt-nil
|
|
(jolt-vector form (substring s j end))))))
|
|
|
|
;; __read-tagged: apply a built-in data reader to an already-read form. The tag
|
|
;; is the :#name keyword the reader produced; #uuid/#inst reuse the inc X ctors.
|
|
(define (jolt-read-tagged tag form)
|
|
(cond
|
|
((eq? tag (keyword #f "#uuid")) (jolt-uuid-from-string form))
|
|
((eq? tag (keyword #f "#inst")) (jolt-inst-from-string form))
|
|
(else (jolt-throw (jolt-ex-info (string-append "No reader function for tag " (jolt-pr-str tag))
|
|
(empty-pmap))))))
|
|
|
|
(def-var! "clojure.core" "read-string" jolt-read-string)
|
|
(def-var! "clojure.core" "__parse-next" jolt-parse-next)
|
|
(def-var! "clojure.core" "__read-tagged" jolt-read-tagged)
|