48e2ef5910
Rephrase comments that pointed at deleted Janet files (emit.janet, the seed
sources, 'the Janet back end punts ...') to present-tense descriptions of the
Chez behavior. Comment/docstring-only; the self-host fixpoint is unchanged
(comments don't affect the compiled seed).
Delete five files that were Janet-host shims with no Chez path: clojure.java.io
(provided natively by host/chez/io.ss), and jolt.{nrepl,png,interop,shell}
(the janet.* bridge, os/shell, janet.net — none exist on Chez).
jolt-cf1q.6
469 lines
22 KiB
Clojure
469 lines
22 KiB
Clojure
(ns jolt.reader
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"Portable Clojure reader: source text -> reader forms (Chez Phase 3, jolt-cf1q.4).
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All the lexing/parsing LOGIC
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is portable Clojure; form CONSTRUCTION and string->number parsing delegate to the
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jolt.host contract (form-make-symbol/char, form-char-from-name, form-scan-number)
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— a Clojure source file cannot write a {:jolt/type :symbol} literal (it parses as
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a tagged reader form), and the concrete form representation is the host's to own.
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Same split the analyzer uses for the form-* readers. Once cross-compiled this runs
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ON Chez to drive compile-from-source.
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Positions are CHARACTER indices; for ASCII
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source they coincide with byte indices, and form VALUES are identical either way — the parity gate
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compares values, not positions.
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INCREMENT 5a (jolt-50xx): the ATOM layer — whitespace/comments, symbols (+ nil/
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true/false), keywords, strings, numbers (sign/hex/radix/ratio/fractional/
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exponent, trailing N/M), characters. Collections, quote/deref/meta, and dispatch
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(#) land in 5b/5c (they throw not-yet-ported so a hit is loud)."
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(:require [clojure.string :as str]
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[jolt.host :refer [form-make-symbol form-make-char form-char-from-name
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form-scan-number form-make-list form-make-vector
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form-make-map form-sym-merge-meta form-make-set
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form-make-tagged form-gensym-name
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form-sym? form-sym-name form-sym-ns form-char?
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form-list? form-vec? form-set? form-map?
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form-elements form-vec-items form-set-items
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form-map-pairs]]))
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;; Source access by CHARACTER codepoint
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;; (identical to byte access for ASCII). cp = codepoint at i; len = character count.
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(defn- cp [s i] (int (nth s i)))
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(defn- len [s] (count s))
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(defn- whitespace? [c] (or (= c 32) (= c 9) (= c 10) (= c 13) (= c 44))) ; space tab nl cr ,
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(defn- digit? [c] (and (>= c 48) (<= c 57)))
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(defn- hex-digit? [c]
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(or (digit? c) (and (>= c 65) (<= c 70)) (and (>= c 97) (<= c 102))))
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(defn- symbol-start? [c]
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(or (and (>= c 65) (<= c 90)) (and (>= c 97) (<= c 122))
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(= c 42) (= c 43) (= c 33) (= c 95) (= c 45) (= c 63) (= c 46)
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(= c 60) (= c 62) (= c 61) (= c 38) (= c 124) (= c 36) (= c 37) (= c 47)))
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(defn- symbol-char? [c]
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(or (symbol-start? c) (digit? c) (= c 35) (= c 39) (= c 58))) ; + # ' :
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(defn- skip-whitespace [s pos]
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(if (and (< pos (len s)) (whitespace? (cp s pos)))
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(recur s (inc pos))
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pos))
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(defn- read-until-newline [s pos]
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(if (or (>= pos (len s)) (= (cp s pos) 10)) pos (recur s (inc pos))))
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;; --- symbols -----------------------------------------------------------------
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(defn- read-symbol-name [s pos end]
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(if (and (< end (len s)) (symbol-char? (cp s end))) (recur s pos (inc end)) end))
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(defn- read-symbol* [s pos]
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(let [end (read-symbol-name s pos pos)]
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(when (= end pos)
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(throw (ex-info (str "Unrecognized character: " (char (cp s pos))) {})))
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(let [nm (subs s pos end)]
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(cond
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(= nm "nil") [nil end]
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(= nm "true") [true end]
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(= nm "false") [false end]
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:else [(form-make-symbol nm) end]))))
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;; --- keywords ----------------------------------------------------------------
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(defn- read-keyword-name [s pos end]
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(if (and (< end (len s)) (symbol-char? (cp s end))) (recur s pos (inc end)) end))
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(defn- read-keyword* [s pos]
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;; pos is at the first colon; ::foo is treated as :foo (no auto-resolution).
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(let [start (if (and (< (inc pos) (len s)) (= (cp s (inc pos)) 58)) (+ pos 2) (inc pos))
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end (read-keyword-name s start start)]
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[(keyword (subs s start end)) end]))
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;; --- strings -----------------------------------------------------------------
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(defn- escape-char [c]
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(cond (= c 110) "\n" (= c 116) "\t" (= c 114) "\r" (= c 92) "\\" (= c 34) "\""
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:else (str (char c))))
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(defn- read-string* [s pos]
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;; pos at opening double-quote
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(loop [p (inc pos) acc []]
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(when (>= p (len s)) (throw (ex-info "Unterminated string" {})))
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(let [c (cp s p)]
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(cond
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(= c 92) (let [np (inc p)]
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(when (>= np (len s)) (throw (ex-info "Unterminated escape" {})))
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(recur (+ p 2) (conj acc (escape-char (cp s np)))))
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(= c 34) [(apply str acc) (inc p)]
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:else (recur (inc p) (conj acc (str (char c))))))))
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;; --- numbers -----------------------------------------------------------------
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(defn- read-digits [s pos end]
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(if (and (< end (len s)) (digit? (cp s end))) (recur s pos (inc end)) end))
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(defn- read-hex-digits [s pos end]
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(if (and (< end (len s)) (hex-digit? (cp s end))) (recur s pos (inc end)) end))
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;; Value of an alphanumeric digit for radix parsing (0-9, a-z/A-Z = 10-35).
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(defn- radix-digit-val [c]
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(cond
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(and (>= c 48) (<= c 57)) (- c 48)
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(and (>= c 97) (<= c 122)) (+ 10 (- c 97))
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(and (>= c 65) (<= c 90)) (+ 10 (- c 65))
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:else nil))
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(defn- read-alnum [s pos end]
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(if (and (< end (len s)) (radix-digit-val (cp s end))) (recur s pos (inc end)) end))
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(defn- read-exponent [s end]
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;; if s[end] is e/E (optionally signed) followed by digits, return index past it
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(if (and (< end (len s)) (let [c (cp s end)] (or (= c 101) (= c 69))))
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(let [p (if (and (< (inc end) (len s)) (let [c (cp s (inc end))] (or (= c 43) (= c 45))))
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(+ end 2) (inc end))
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de (read-digits s p p)]
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(if (> de p) de end))
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end))
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;; Jolt has no bignum/ratio: N (bigint) / M (bigdec) suffixes read as the plain
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;; number, a ratio a/b reads as the double quotient, radixed ints by base.
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(defn- read-number* [s pos]
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(let [length (len s)
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;; optional leading sign: - negates; + is a positive no-op (Clojure reads
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;; +5 as 5). read-form only dispatches +digit/-digit, so the sign is real.
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neg (and (< pos length) (= (cp s pos) 45))
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plus (and (< pos length) (= (cp s pos) 43))
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start (if (or neg plus) (inc pos) pos)
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hex? (and (< (inc start) length) (= (cp s start) 48)
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(let [c1 (cp s (inc start))] (or (= c1 120) (= c1 88))))] ; 0x / 0X
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(if hex?
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(let [hs (+ start 2) he (read-hex-digits s hs hs)]
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(when (= he hs) (throw (ex-info "Expected hex digits" {})))
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(let [he2 (if (and (< he length) (= (cp s he) 78)) (inc he) he) ; trailing N
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val (form-scan-number (str "0x" (subs s hs he)))]
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[(if neg (- val) val) he2]))
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(let [iend (read-digits s start start)]
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(when (= iend start) (throw (ex-info "Expected number" {})))
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(cond
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;; radix integer <base>r<digits>
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(and (< iend length) (let [c (cp s iend)] (or (= c 114) (= c 82))))
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(let [base (form-scan-number (subs s start iend))
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ds (inc iend) de (read-alnum s ds ds)]
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(when (= de ds) (throw (ex-info "Expected radix digits" {})))
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(let [acc (reduce (fn [a i] (+ (* a base) (radix-digit-val (cp s i)))) 0 (range ds de))]
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[(if neg (- acc) acc) de]))
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;; ratio <int>/<int> (only when a digit follows the slash)
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(and (< (inc iend) length) (= (cp s iend) 47) (digit? (cp s (inc iend))))
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(let [ds (inc iend) de (read-digits s ds ds)
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numr (form-scan-number (subs s start iend))
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den (form-scan-number (subs s ds de))]
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[(if neg (- (/ numr den)) (/ numr den)) de])
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;; fractional and/or exponent, optional trailing N/M
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:else
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(let [frac-end (if (and (< iend length) (= (cp s iend) 46))
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(let [fs (inc iend) fe (read-digits s fs fs)]
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(when (= fe fs) (throw (ex-info "Expected digit after ." {})))
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fe)
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iend)
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exp-end (read-exponent s frac-end)
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val (form-scan-number (subs s start exp-end))
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fin (if (and (< exp-end length) (let [c (cp s exp-end)] (or (= c 78) (= c 77))))
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(inc exp-end) exp-end)]
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[(if neg (- val) val) fin]))))))
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;; --- characters --------------------------------------------------------------
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(defn- read-char-name-end [s pos]
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(if (and (< pos (len s)) (symbol-char? (cp s pos))) (recur s (inc pos)) pos))
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(defn- read-char* [s pos]
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(when (>= (inc pos) (len s)) (throw (ex-info "unexpected end of input after \\" {})))
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(let [end (read-char-name-end s (inc pos))]
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(if (= end (inc pos))
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;; a non-symbol char right after \ is a one-character literal of itself
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[(form-make-char (cp s (inc pos))) (+ pos 2)]
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[(form-char-from-name (subs s (inc pos) end)) end])))
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;; --- dispatcher --------------------------------------------------------------
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;; read-form returns a CONTROL triple [kind payload pos]:
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;; :form payload=the form a real datum
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;; :skip payload=nil a comment (;) or #_ discard — produced nothing
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;; :splice payload=items-vector #?@ — contributes 0+ items to the enclosing coll
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;; Out-of-band control (rather than :jolt/skip / :jolt/splice sentinel
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;; FORMS) keeps it collision-free and host-neutral — no tagged-struct to build or
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;; recognize. Collection readers dispatch on kind; read-next-form skips :skip.
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(declare read-form)
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(defn- number-start? [s pos c]
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(or (digit? c)
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(and (= c 45) (< (inc pos) (len s)) (digit? (cp s (inc pos))))
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(and (= c 43) (< (inc pos) (len s)) (digit? (cp s (inc pos))))))
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;; Read items until `close`, dispatching control kinds. Returns [items-vec end].
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(defn- read-delimited [s start-pos close errmsg]
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(loop [pos start-pos items []]
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(let [pos (skip-whitespace s pos)]
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(when (>= pos (len s)) (throw (ex-info errmsg {})))
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(if (= (cp s pos) close)
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[items (inc pos)]
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(let [[kind payload np] (read-form s pos)]
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(case kind
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:skip (recur np items)
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:splice (recur np (into items payload))
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:form (recur np (conj items payload))))))))
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(defn- read-list* [s pos]
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(let [[items end] (read-delimited s (inc pos) 41 "Unterminated list")] ; )
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[:form (form-make-list items) end]))
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(defn- read-vector* [s pos]
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(let [[items end] (read-delimited s (inc pos) 93 "Unterminated vector")] ; ]
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[:form (form-make-vector items) end]))
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;; Map: pair up keys and values, skipping comments/#_ in either slot while keeping
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;; the pending key (dropping both desyncs the pairing). Splice in a map slot lands
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;; in inc 5c; here a key/value is always a single :form (or :skip).
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(defn- read-map* [s pos]
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(loop [pos (inc pos) kvs []]
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(let [pos (skip-whitespace s pos)]
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(when (>= pos (len s)) (throw (ex-info "Unterminated map" {})))
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(if (= (cp s pos) 125) ; }
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[:form (form-make-map kvs) (inc pos)]
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(let [[kk kp knp] (read-form s pos)]
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(if (= kk :skip)
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(recur knp kvs)
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;; key in hand; read the value slot, skipping trivia but keeping the key
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(let [[v vnp]
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(loop [vp (skip-whitespace s knp)]
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(when (>= vp (len s)) (throw (ex-info "Unterminated map" {})))
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(let [[vk vp2 vnp2] (read-form s vp)]
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(if (= vk :skip) (recur (skip-whitespace s vnp2)) [vp2 vnp2])))]
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(recur vnp (conj (conj kvs kp) v)))))))))
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;; Read the next REAL form (skip :skip), returning [form pos]. Used wherever a
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;; single datum is needed (quote/meta/top level).
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(defn- read-next-form [s pos]
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(let [[kind payload np] (read-form s pos)]
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(case kind
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:skip (recur s np)
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:form [payload np]
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:splice (throw (ex-info "splice (#?@) not inside a collection" {})))))
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;; syntax-quote of a self-evaluating literal collapses to the literal at read time
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;; (so nested backticks over literals are inert). NOT symbols (they qualify) or
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;; collections (they template).
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(defn- self-evaluating-literal? [form]
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(or (nil? form) (true? form) (false? form) (number? form)
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(string? form) (keyword? form) (form-char? form)))
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(defn- read-quote* [s newpos token-sym]
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(let [[form finalpos] (read-next-form s newpos)]
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(if (and (= "syntax-quote" (form-sym-name token-sym)) (self-evaluating-literal? form))
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[:form form finalpos]
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[:form (form-make-list [token-sym form]) finalpos])))
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;; Normalize a metadata reader form: keyword -> {kw true}; symbol/string -> {:tag …}
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;; (a symbol tag keeps its ns qualifier); else nil (a map-literal meta).
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(defn- meta-form->map [meta-form]
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(cond
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(keyword? meta-form) {meta-form true}
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(form-sym? meta-form) {:tag (if (form-sym-ns meta-form)
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(str (form-sym-ns meta-form) "/" (form-sym-name meta-form))
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(form-sym-name meta-form))}
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(string? meta-form) {:tag meta-form}
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:else nil))
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(defn- read-meta* [s pos]
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;; pos at ^
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(let [[meta-form np] (read-next-form s (inc pos))
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[form np2] (read-next-form s np)
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m (meta-form->map meta-form)]
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(if (and m (form-sym? form))
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;; attach to the symbol itself (^Type x / ^:dynamic) — stays a bare symbol
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[:form (form-sym-merge-meta form m) np2]
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;; non-symbol target -> a runtime with-meta form (normalized map, or the
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;; raw map-literal meta when m is nil)
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[:form (form-make-list [(form-make-symbol "with-meta") form (if m m meta-form)]) np2])))
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;; --- dispatch (#) ------------------------------------------------------------
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;; Reader-conditional feature set (spec 02-reader). jolt's portable default; the
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;; JOLT_FEATURES env override is a host concern wired later. :default always honored.
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(def reader-features (atom #{:jolt :default}))
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(defn set-reader-features! [features] (reset! reader-features (conj (set features) :default)))
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(defn- read-set* [s pos]
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;; pos at #, next char {
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(let [[items end] (read-delimited s (+ pos 2) 125 "Unterminated set")] ; }
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[:form (form-make-set items) end]))
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(defn- read-var-quote* [s pos]
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;; pos at #, next char '
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(let [[form np] (read-next-form s (+ pos 2))]
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[:form (form-make-list [(form-make-symbol "var") form]) np]))
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(defn- read-regex* [s pos]
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;; pos at #, next char "; read raw to the unescaped closing " (backslashes kept)
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(loop [i (+ pos 2)]
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(when (>= i (len s)) (throw (ex-info "Unterminated regex literal" {})))
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(let [c (cp s i)]
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(cond
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(= c 92) (recur (+ i 2)) ; backslash escapes next char
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(= c 34) [:form (form-make-tagged :regex (subs s (+ pos 2) i)) (inc i)]
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:else (recur (inc i))))))
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;; #?(…) / #?@(…): pick the first clause whose feature key is active (clause order,
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;; like Clojure). #? -> :skip when the result is nil (e.g. a :cljs branch); #?@ ->
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;; :splice the resolved items into the enclosing collection.
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(defn- rc-resolve [clauses]
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;; clauses: a jolt vector of [feature-kw form feature-kw form ...]
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(loop [i 0]
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(if (>= i (count clauses))
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[false nil]
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(if (contains? @reader-features (nth clauses i))
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[true (nth clauses (inc i))]
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(recur (+ i 2))))))
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(defn- read-reader-conditional* [s pos]
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;; pos at #, next char ? (optionally ?@)
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(let [splice? (and (< (+ pos 2) (len s)) (= (cp s (+ pos 2)) 64)) ; @
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form-start (if splice? (+ pos 3) (+ pos 2))
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[form np] (read-next-form s form-start)]
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(if (form-list? form)
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(let [clauses (form-elements form)
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[matched result] (rc-resolve clauses)]
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(if splice?
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(let [items (cond (not matched) []
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(form-list? result) (vec (form-elements result))
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(form-vec? result) (vec (form-vec-items result))
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:else [result])]
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[:splice items np])
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(if (or (not matched) (nil? result)) [:skip nil np] [:form result np])))
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(throw (ex-info "reader conditional body must be a list" {})))))
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;; Symbolic values ##Inf ##-Inf ##NaN.
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(defn- read-symbolic* [s pos]
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(let [end (read-symbol-name s (+ pos 2) (+ pos 2))
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nm (subs s (+ pos 2) end)]
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(cond
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(= nm "Inf") [:form ##Inf end]
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(= nm "-Inf") [:form ##-Inf end]
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(= nm "NaN") [:form ##NaN end]
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:else (throw (ex-info (str "Invalid symbolic value: ##" nm) {})))))
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(defn- read-tagged* [s pos]
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;; unknown dispatch -> a tagged literal (#inst, #uuid, #foo). The tag includes
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;; the leading # (read-symbol-name starts at #).
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(let [end (read-symbol-name s pos pos)
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tag (subs s pos end)
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[form np] (read-next-form s end)]
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[:form (form-make-tagged (keyword tag) form) np]))
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(declare read-anon-fn*)
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(defn- read-dispatch* [s pos]
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;; pos at #
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(when (>= (inc pos) (len s)) (throw (ex-info "Unexpected end after #" {})))
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(let [c (cp s (inc pos))]
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(cond
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(= c 123) (read-set* s pos) ; #{
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(= c 40) (read-anon-fn* s pos) ; #(
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(= c 63) (read-reader-conditional* s pos) ; #?
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(= c 95) (let [[_ _ np] (read-form s (+ pos 2))] [:skip nil np]) ; #_ discard
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(= c 39) (read-var-quote* s pos) ; #'
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(= c 94) (read-meta* s (inc pos)) ; #^ (deprecated, = ^)
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(= c 34) (read-regex* s pos) ; #"
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(= c 35) (read-symbolic* s pos) ; ##
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:else (read-tagged* s pos))))
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|
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;; #(...) anonymous fn. Positional %-arg index: % and %1 => 1, %N => N, %& => the
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;; rest param (:rest); anything else is not positional (nil). Fixed arity = max
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;; index used (Clojure: #(do %2 %&) => [p1 p2 & rest], unused lower slots still
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;; get a placeholder param).
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|
(defn- pct-index [nm]
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(cond
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(= nm "%") 1
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|
(= nm "%&") :rest
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(and (> (count nm) 1) (= "%" (subs nm 0 1)))
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(let [n (form-scan-number (subs nm 1))]
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|
(if (and n (integer? n) (>= n 1)) n nil))
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:else nil))
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|
|
|
;; Pass 1: collect every %-index used anywhere in the form tree.
|
|
(defn- collect-pcts [form acc]
|
|
(cond
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|
(form-sym? form) (let [i (pct-index (form-sym-name form))] (if i (conj acc i) acc))
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(form-list? form) (reduce (fn [a x] (collect-pcts x a)) acc (form-elements form))
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|
(form-vec? form) (reduce (fn [a x] (collect-pcts x a)) acc (form-vec-items form))
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|
(form-set? form) (reduce (fn [a x] (collect-pcts x a)) acc (form-set-items form))
|
|
(form-map? form) (reduce (fn [a p] (collect-pcts (nth p 1) (collect-pcts (nth p 0) a)))
|
|
acc (form-map-pairs form))
|
|
:else acc))
|
|
|
|
;; Pass 2: replace each %-symbol with its slot's gensym (rebuilding collections).
|
|
(defn- replace-pct [form slot-syms rest-sym]
|
|
(cond
|
|
(form-sym? form) (let [idx (pct-index (form-sym-name form))]
|
|
(cond (= idx :rest) rest-sym
|
|
idx (get slot-syms idx)
|
|
:else form))
|
|
(form-list? form) (form-make-list (mapv #(replace-pct % slot-syms rest-sym) (form-elements form)))
|
|
(form-vec? form) (form-make-vector (mapv #(replace-pct % slot-syms rest-sym) (form-vec-items form)))
|
|
(form-set? form) (form-make-set (mapv #(replace-pct % slot-syms rest-sym) (form-set-items form)))
|
|
(form-map? form) (form-make-map
|
|
(vec (mapcat (fn [p] [(replace-pct (nth p 0) slot-syms rest-sym)
|
|
(replace-pct (nth p 1) slot-syms rest-sym)])
|
|
(form-map-pairs form))))
|
|
:else form))
|
|
|
|
(defn- gensym-param [] (form-make-symbol (str (form-gensym-name) "#")))
|
|
|
|
(defn- read-anon-fn* [s pos]
|
|
;; pos at #, next char (
|
|
(let [[form np] (read-next-form s (inc pos))
|
|
pcts (collect-pcts form [])
|
|
max-n (reduce (fn [m i] (if (and (number? i) (> i m)) i m)) 0 pcts)
|
|
has-rest (boolean (some #(= :rest %) pcts))
|
|
slot-syms (into {} (map (fn [i] [i (gensym-param)]) (range 1 (inc max-n))))
|
|
rest-sym (when has-rest (gensym-param))
|
|
replaced (replace-pct form slot-syms rest-sym)
|
|
arg-names (let [base (mapv #(get slot-syms %) (range 1 (inc max-n)))]
|
|
(if has-rest (conj base (form-make-symbol "&") rest-sym) base))]
|
|
[:form (form-make-list [(form-make-symbol "fn*") (form-make-vector arg-names) replaced]) np]))
|
|
|
|
(defn read-form [s pos]
|
|
(let [pos (skip-whitespace s pos)]
|
|
(if (>= pos (len s))
|
|
[:form nil pos]
|
|
(let [c (cp s pos)]
|
|
(cond
|
|
(= c 59) [:skip nil (read-until-newline s pos)] ; ; comment
|
|
(= c 34) (let [r (read-string* s pos)] [:form (nth r 0) (nth r 1)])
|
|
(= c 58) (let [r (read-keyword* s pos)] [:form (nth r 0) (nth r 1)])
|
|
(= c 92) (let [r (read-char* s pos)] [:form (nth r 0) (nth r 1)])
|
|
(= c 40) (read-list* s pos) ; (
|
|
(= c 91) (read-vector* s pos) ; [
|
|
(= c 123) (read-map* s pos) ; {
|
|
(= c 39) (read-quote* s (inc pos) (form-make-symbol "quote")) ; '
|
|
(= c 96) (read-quote* s (inc pos) (form-make-symbol "syntax-quote")) ; `
|
|
(= c 126) (if (and (< (inc pos) (len s)) (= (cp s (inc pos)) 64)) ; ~ / ~@
|
|
(read-quote* s (+ pos 2) (form-make-symbol "unquote-splicing"))
|
|
(read-quote* s (inc pos) (form-make-symbol "unquote")))
|
|
(= c 64) (read-quote* s (inc pos) (form-make-symbol "clojure.core/deref")) ; @
|
|
(= c 94) (read-meta* s pos) ; ^
|
|
(= c 41) (throw (ex-info "Unmatched delimiter: )" {}))
|
|
(= c 93) (throw (ex-info "Unmatched delimiter: ]" {}))
|
|
(= c 125) (throw (ex-info "Unmatched delimiter: }" {}))
|
|
(= c 35) (read-dispatch* s pos) ; #
|
|
(number-start? s pos c) (let [r (read-number* s pos)] [:form (nth r 0) (nth r 1)])
|
|
(symbol-start? c) (let [r (read-symbol* s pos)] [:form (nth r 0) (nth r 1)])
|
|
:else (throw (ex-info (str "read-form: unexpected char '" (char c) "' (" c ")") {})))))))
|
|
|
|
(defn read-one
|
|
"Read the first form of `s` (skipping leading trivia). Returns the form."
|
|
[s]
|
|
(first (read-next-form s 0)))
|
|
|
|
(defn read-all
|
|
"Read every top-level form of `s`, returning them in a vector (trivia skipped)."
|
|
[s]
|
|
(loop [pos 0 acc []]
|
|
(let [p (skip-whitespace s pos)]
|
|
(if (>= p (len s))
|
|
acc
|
|
(let [[kind payload np] (read-form s p)]
|
|
(case kind
|
|
:skip (recur np acc)
|
|
:splice (recur np (into acc payload))
|
|
:form (recur np (conj acc payload))))))))
|