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ee002f2e02
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Tokenizer: +. -. *. /. (with -. avoiding clash with negative float literals). Parser table places dotted ops at int-precedence levels. Eval routes to host SX +/-/*//. HM types them Float->Float->Float; literal floats now infer as Float (was Int). OCaml-style 1.5 +. 2.5 : Float works end-to-end through tokenize + parse + eval + infer.
391 lines
13 KiB
Plaintext
391 lines
13 KiB
Plaintext
;; lib/ocaml/tokenizer.sx — OCaml lexer.
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;;
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;; Tokens: ident, ctor (uppercase ident), keyword, number, string, char, op, eof.
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;; Token shape: {:type :value :pos} via lex-make-token.
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;; OCaml is not indentation-sensitive — no layout pass.
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;; Block comments (* ... *) nest. There is no line-comment syntax.
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(prefix-rename
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"ocaml-"
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(quote
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((make-token lex-make-token)
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(digit? lex-digit?)
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(hex-digit? lex-hex-digit?)
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(alpha? lex-alpha?)
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(alnum? lex-alnum?)
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(ident-start? lex-ident-start?)
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(ident-char? lex-ident-char?)
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(ws? lex-whitespace?))))
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(define
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ocaml-keywords
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(list
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"and"
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"as"
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"assert"
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"begin"
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"class"
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"constraint"
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"do"
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"done"
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"downto"
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"else"
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"end"
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"exception"
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"external"
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"false"
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"for"
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"fun"
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"function"
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"functor"
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"if"
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"in"
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"include"
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"inherit"
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"initializer"
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"lazy"
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"let"
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"match"
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"method"
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"module"
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"mutable"
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"new"
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"nonrec"
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"object"
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"of"
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"open"
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"or"
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"private"
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"rec"
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"sig"
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"struct"
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"then"
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"to"
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"true"
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"try"
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"type"
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"val"
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"virtual"
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"when"
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"while"
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"with"
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"land"
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"lor"
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"lxor"
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"lsl"
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"lsr"
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"asr"
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"mod"))
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(define ocaml-keyword? (fn (word) (contains? ocaml-keywords word)))
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(define
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ocaml-upper?
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(fn (c) (and (not (= c nil)) (>= c "A") (<= c "Z"))))
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(define
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ocaml-tokenize
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(fn
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(src)
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(let
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((tokens (list)) (pos 0) (src-len (len src)))
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(define
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ocaml-peek
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(fn
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(offset)
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(if (< (+ pos offset) src-len) (nth src (+ pos offset)) nil)))
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(define cur (fn () (ocaml-peek 0)))
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(define advance! (fn (n) (set! pos (+ pos n))))
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(define
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push!
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(fn
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(type value start)
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(append! tokens (ocaml-make-token type value start))))
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(define
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skip-block-comment!
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(fn
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(depth)
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(cond
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((>= pos src-len) nil)
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((and (= (cur) "*") (= (ocaml-peek 1) ")"))
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(begin
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(advance! 2)
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(when
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(> depth 1)
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(skip-block-comment! (- depth 1)))))
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((and (= (cur) "(") (= (ocaml-peek 1) "*"))
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(begin
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(advance! 2)
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(skip-block-comment! (+ depth 1))))
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(else (begin (advance! 1) (skip-block-comment! depth))))))
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(define
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skip-ws!
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(fn
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()
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(cond
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((>= pos src-len) nil)
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((ocaml-ws? (cur)) (begin (advance! 1) (skip-ws!)))
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((and (= (cur) "(") (= (ocaml-peek 1) "*"))
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(begin
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(advance! 2)
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(skip-block-comment! 1)
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(skip-ws!)))
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(else nil))))
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(define
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read-ident
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(fn
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(start)
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(begin
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(when
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(and (< pos src-len) (ocaml-ident-char? (cur)))
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(begin (advance! 1) (read-ident start)))
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(when
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(and (< pos src-len) (= (cur) "'"))
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(begin (advance! 1) (read-ident start)))
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(slice src start pos))))
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(define
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read-decimal-digits!
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(fn
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()
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(when
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(and (< pos src-len) (or (ocaml-digit? (cur)) (= (cur) "_")))
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(begin (advance! 1) (read-decimal-digits!)))))
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(define
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read-hex-digits!
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(fn
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()
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(when
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(and
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(< pos src-len)
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(or (ocaml-hex-digit? (cur)) (= (cur) "_")))
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(begin (advance! 1) (read-hex-digits!)))))
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(define
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read-exp-part!
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(fn
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()
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(when
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(and (< pos src-len) (or (= (cur) "e") (= (cur) "E")))
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(let
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((p1 (ocaml-peek 1)))
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(when
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(or
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(and (not (= p1 nil)) (ocaml-digit? p1))
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(and
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(or (= p1 "+") (= p1 "-"))
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(< (+ pos 2) src-len)
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(ocaml-digit? (ocaml-peek 2))))
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(begin
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(advance! 1)
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(when
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(and
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(< pos src-len)
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(or (= (cur) "+") (= (cur) "-")))
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(advance! 1))
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(read-decimal-digits!)))))))
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(define
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strip-underscores
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(fn
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(s)
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(let
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((out (list)) (i 0) (n (len s)))
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(begin
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(define
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loop
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(fn
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()
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(when
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(< i n)
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(begin
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(when
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(not (= (nth s i) "_"))
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(append! out (nth s i)))
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(set! i (+ i 1))
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(loop)))))
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(loop)
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(join "" out)))))
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(define
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read-number
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(fn
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(start)
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(cond
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((and (= (cur) "0") (< (+ pos 1) src-len) (or (= (ocaml-peek 1) "x") (= (ocaml-peek 1) "X")))
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(begin
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(advance! 2)
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(read-hex-digits!)
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(let
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((raw (slice src (+ start 2) pos)))
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(parse-number (str "0x" (strip-underscores raw))))))
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(else
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(begin
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(read-decimal-digits!)
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(when
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(and
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(< pos src-len)
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(= (cur) ".")
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(or
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(>= (+ pos 1) src-len)
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(not (= (ocaml-peek 1) "."))))
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(begin (advance! 1) (read-decimal-digits!)))
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(read-exp-part!)
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(parse-number (strip-underscores (slice src start pos))))))))
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(define
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read-string-literal
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(fn
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()
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(let
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((chars (list)))
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(begin
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(advance! 1)
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(define
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loop
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(fn
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()
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(cond
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((>= pos src-len) nil)
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((= (cur) "\\")
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(begin
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(advance! 1)
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(when
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(< pos src-len)
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(let
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((ch (cur)))
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(begin
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(cond
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((= ch "n") (append! chars "\n"))
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((= ch "t") (append! chars "\t"))
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((= ch "r") (append! chars "\r"))
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((= ch "b") (append! chars "\\b"))
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((= ch "\\") (append! chars "\\"))
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((= ch "'") (append! chars "'"))
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((= ch "\"") (append! chars "\""))
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((= ch " ") nil)
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(else (append! chars ch)))
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(advance! 1))))
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(loop)))
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((= (cur) "\"") (advance! 1))
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(else
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(begin
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(append! chars (cur))
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(advance! 1)
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(loop))))))
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(loop)
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(join "" chars)))))
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(define
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read-char-literal
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(fn
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()
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(begin
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(advance! 1)
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(let
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((value (cond ((= (cur) "\\") (begin (advance! 1) (let ((ch (cur))) (begin (advance! 1) (cond ((= ch "n") "\n") ((= ch "t") "\t") ((= ch "r") "\r") ((= ch "b") "\\b") ((= ch "\\") "\\") ((= ch "'") "'") ((= ch "\"") "\"") (else ch)))))) (else (let ((ch (cur))) (begin (advance! 1) ch))))))
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(begin
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(when
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(and (< pos src-len) (= (cur) "'"))
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(advance! 1))
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value)))))
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(define
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try-punct
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(fn
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(start)
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(let
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((c (cur))
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(c1 (ocaml-peek 1))
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(c2 (ocaml-peek 2)))
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(cond
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((and (= c ";") (= c1 ";"))
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(begin (advance! 2) (push! "op" ";;" start) true))
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((and (= c "+") (= c1 "."))
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(begin (advance! 2) (push! "op" "+." start) true))
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((and (= c "-") (= c1 ".") (not (and (not (= c2 nil)) (ocaml-digit? c2))))
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(begin (advance! 2) (push! "op" "-." start) true))
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((and (= c "*") (= c1 "."))
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(begin (advance! 2) (push! "op" "*." start) true))
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((and (= c "/") (= c1 "."))
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(begin (advance! 2) (push! "op" "/." start) true))
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((and (= c "-") (= c1 ">"))
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(begin (advance! 2) (push! "op" "->" start) true))
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((and (= c "<") (= c1 "-"))
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(begin (advance! 2) (push! "op" "<-" start) true))
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((and (= c ":") (= c1 "="))
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(begin (advance! 2) (push! "op" ":=" start) true))
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((and (= c ":") (= c1 ":"))
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(begin (advance! 2) (push! "op" "::" start) true))
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((and (= c "|") (= c1 "|"))
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(begin (advance! 2) (push! "op" "||" start) true))
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((and (= c "&") (= c1 "&"))
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(begin (advance! 2) (push! "op" "&&" start) true))
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((and (= c "<") (= c1 "="))
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(begin (advance! 2) (push! "op" "<=" start) true))
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((and (= c ">") (= c1 "="))
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(begin (advance! 2) (push! "op" ">=" start) true))
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((and (= c "<") (= c1 ">"))
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(begin (advance! 2) (push! "op" "<>" start) true))
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((and (= c "=") (= c1 "="))
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(begin (advance! 2) (push! "op" "==" start) true))
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((and (= c "!") (= c1 "="))
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(begin (advance! 2) (push! "op" "!=" start) true))
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((and (= c "|") (= c1 ">"))
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(begin (advance! 2) (push! "op" "|>" start) true))
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((and (= c "<") (= c1 "|"))
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(begin (advance! 2) (push! "op" "<|" start) true))
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((and (= c "@") (= c1 "@"))
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(begin (advance! 2) (push! "op" "@@" start) true))
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((and (= c "*") (= c1 "*"))
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(begin (advance! 2) (push! "op" "**" start) true))
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((or (= c "+") (= c "-") (= c "*") (= c "/") (= c "%") (= c "^") (= c "<") (= c ">") (= c "=") (= c "(") (= c ")") (= c "{") (= c "}") (= c "[") (= c "]") (= c ";") (= c ":") (= c ",") (= c ".") (= c "|") (= c "!") (= c "&") (= c "@") (= c "?") (= c "~") (= c "#"))
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(begin (advance! 1) (push! "op" c start) true))
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(else false)))))
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(define
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step
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(fn
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()
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(begin
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(skip-ws!)
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(when
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(< pos src-len)
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(let
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((start pos) (c (cur)))
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(cond
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((ocaml-ident-start? c)
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(let
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((word (read-ident start)))
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(begin
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(cond
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((ocaml-keyword? word)
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(push! "keyword" word start))
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((ocaml-upper? c) (push! "ctor" word start))
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(else (push! "ident" word start)))
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(step))))
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((ocaml-digit? c)
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(let
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((v (read-number start)))
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(begin (push! "number" v start) (step))))
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((= c "\"")
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(let
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((s (read-string-literal)))
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(begin (push! "string" s start) (step))))
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((and (= c "'") (< (+ pos 1) src-len) (or (and (= (ocaml-peek 1) "\\") (< (+ pos 3) src-len) (= (ocaml-peek 3) "'")) (and (not (= (ocaml-peek 1) "\\")) (< (+ pos 2) src-len) (= (ocaml-peek 2) "'"))))
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(let
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((v (read-char-literal)))
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(begin (push! "char" v start) (step))))
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((= c "'")
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(begin
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(advance! 1)
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(when
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(and (< pos src-len) (ocaml-ident-start? (cur)))
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(begin
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(advance! 1)
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(read-ident (+ start 1))))
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(push!
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"tyvar"
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(slice src (+ start 1) pos)
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start)
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(step)))
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((try-punct start) (step))
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(else
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(error
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(str "ocaml-tokenize: unexpected char " c " at " pos)))))))))
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(step)
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(push! "eof" nil pos)
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tokens)))
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