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1084 lines
33 KiB
Plaintext
1084 lines
33 KiB
Plaintext
;; _hyperscript tokenizer — produces token stream from hyperscript source
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;;
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;; Tokens: {:type T :value V :pos P}
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;; Types: "keyword" "ident" "number" "string" "class" "id" "attr" "style"
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;; "selector" "op" "dot" "paren-open" "paren-close" "bracket-open"
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;; "bracket-close" "brace-open" "brace-close" "comma" "colon"
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;; "template" "local" "eof"
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;; ── Token constructor ─────────────────────────────────────────────
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(define hs-make-token
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(fn (type value pos &rest extras)
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(let
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((end-arg (if (>= (len extras) 1) (nth extras 0) nil))
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(line-arg (if (>= (len extras) 2) (nth extras 1) nil)))
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(let
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((end (if (nil? end-arg)
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(+ pos (if (nil? value) 0 (len (str value))))
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end-arg))
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(line (if (nil? line-arg) 1 line-arg)))
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{:pos pos :end end :line line :value value :type type}))))
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;; ── Character predicates ──────────────────────────────────────────
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(define hs-digit? (fn (c) (and (>= c "0") (<= c "9"))))
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(define
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hs-letter?
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(fn (c) (or (and (>= c "a") (<= c "z")) (and (>= c "A") (<= c "Z")))))
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(define hs-ident-start? (fn (c) (or (hs-letter? c) (= c "_") (= c "$"))))
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(define
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hs-ident-char?
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(fn
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(c)
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(or (hs-letter? c) (hs-digit? c) (= c "_") (= c "$") (= c "-"))))
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(define hs-ws? (fn (c) (or (= c " ") (= c "\t") (= c "\n") (= c "\r"))))
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(define
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hs-hex-digit?
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(fn
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(c)
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(or
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(and (>= c "0") (<= c "9"))
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(and (>= c "a") (<= c "f"))
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(and (>= c "A") (<= c "F")))))
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(define
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hs-hex-val
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(fn
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(c)
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(let
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((code (char-code c)))
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(cond
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((and (>= code 48) (<= code 57)) (- code 48))
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((and (>= code 65) (<= code 70)) (- code 55))
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((and (>= code 97) (<= code 102)) (- code 87))
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(true 0)))))
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;; ── Keyword set ───────────────────────────────────────────────────
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(define
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hs-keywords
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(list
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"on"
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"end"
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"set"
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"to"
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"put"
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"into"
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"before"
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"after"
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"add"
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"remove"
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"toggle"
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"if"
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"else"
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"otherwise"
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"then"
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"from"
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"in"
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"of"
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"for"
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"until"
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"wait"
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"send"
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"trigger"
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"call"
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"get"
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"take"
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"log"
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"hide"
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"show"
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"repeat"
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"while"
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"times"
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"forever"
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"break"
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"continue"
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"return"
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"throw"
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"catch"
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"finally"
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"def"
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"tell"
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"make"
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"fetch"
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"as"
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"with"
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"every"
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"or"
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"and"
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"not"
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"is"
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"no"
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"the"
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"my"
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"me"
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"it"
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"its"
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"result"
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"true"
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"false"
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"null"
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"when"
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"between"
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"at"
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"by"
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"queue"
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"elsewhere"
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"event"
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"target"
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"detail"
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"sender"
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"index"
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"indexed"
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"increment"
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"decrement"
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"append"
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"settle"
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"transition"
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"view"
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"over"
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"closest"
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"next"
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"previous"
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"first"
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"last"
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"random"
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"pick"
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"empty"
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"clear"
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"swap"
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"open"
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"close"
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"exists"
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"matches"
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"contains"
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"do"
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"unless"
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"you"
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"your"
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"new"
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"init"
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"start"
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"go"
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"js"
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"less"
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"than"
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"greater"
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"class"
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"anything"
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"install"
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"measure"
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"behavior"
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"called"
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"render"
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"eval"
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"I"
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"am"
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"does"
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"some"
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"mod"
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"equal"
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"equals"
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"really"
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"include"
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"includes"
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"contain"
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"undefined"
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"exist"
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"match"
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"beep"
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"where"
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"sorted"
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"mapped"
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"split"
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"joined"
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"descending"
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"ascending"
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"scroll"
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"select"
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"reset"
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"default"
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"halt"
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"precedes"
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"precede"
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"follow"
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"follows"
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"ignoring"
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"case"
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"changes"
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"focus"
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"blur"
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"dom"
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"morph"
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"using"
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"giving"
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"ask"
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"answer"
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"bind"))
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(define hs-keyword? (fn (word) (some (fn (k) (= k word)) hs-keywords)))
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;; ── Main tokenizer ────────────────────────────────────────────────
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(define
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hs-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)) (current-line 1))
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(define
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hs-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 hs-cur (fn () (hs-peek 0)))
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(define
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hs-advance!
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(fn (n)
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(let ((new-pos (+ pos n)))
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(define
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count-nl!
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(fn (i)
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(when (< i new-pos)
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(when (= (nth src i) "\n")
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(set! current-line (+ current-line 1)))
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(count-nl! (+ i 1)))))
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(count-nl! pos)
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(set! pos new-pos))))
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(define
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skip-ws!
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(fn
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()
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(when
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(and (< pos src-len) (hs-ws? (hs-cur)))
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(hs-advance! 1)
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(skip-ws!))))
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(define
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skip-comment!
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(fn
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()
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(when
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(and (< pos src-len) (not (= (hs-cur) "\n")))
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(hs-advance! 1)
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(skip-comment!))))
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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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(when
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(and (< pos src-len) (hs-ident-char? (hs-cur)))
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(hs-advance! 1)
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(read-ident start))
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(slice src start pos)))
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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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(define
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read-int
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(fn
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()
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(when
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(and (< pos src-len) (hs-digit? (hs-cur)))
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(hs-advance! 1)
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(read-int))))
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(read-int)
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(when
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(and
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(< pos src-len)
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(= (hs-cur) ".")
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(< (+ pos 1) src-len)
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(hs-digit? (hs-peek 1)))
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(hs-advance! 1)
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(read-int))
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(do
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(when
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(and
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(< pos src-len)
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(or (= (hs-cur) "e") (= (hs-cur) "E"))
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(or
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(and (< (+ pos 1) src-len) (hs-digit? (hs-peek 1)))
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(and
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(< (+ pos 2) src-len)
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(or (= (hs-peek 1) "+") (= (hs-peek 1) "-"))
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(hs-digit? (hs-peek 2)))))
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(hs-advance! 1)
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(when
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(and
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(< pos src-len)
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(or (= (hs-cur) "+") (= (hs-cur) "-")))
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(hs-advance! 1))
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(read-int))
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(let
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((num-end pos))
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(when
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(and
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(< pos src-len)
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(or (= (hs-cur) "m") (= (hs-cur) "s")))
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(if
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(and
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(= (hs-cur) "m")
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(< (+ pos 1) src-len)
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(= (hs-peek 1) "s"))
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(hs-advance! 2)
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(when (= (hs-cur) "s") (hs-advance! 1))))
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(slice src start pos)))))
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(define
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read-string
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(fn
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(quote-char)
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(let
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((chars (list)))
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(hs-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)
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(error "Unterminated string")
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(= (hs-cur) "\\")
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(do
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(hs-advance! 1)
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(when
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(< pos src-len)
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(let
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((ch (hs-cur)))
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(cond
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(= ch "n")
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(do (append! chars "\n") (hs-advance! 1))
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(= ch "t")
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(do (append! chars "\t") (hs-advance! 1))
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(= ch "r")
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(do (append! chars "\r") (hs-advance! 1))
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(= ch "b")
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(do
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(append! chars (char-from-code 8))
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(hs-advance! 1))
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(= ch "f")
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(do
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(append! chars (char-from-code 12))
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(hs-advance! 1))
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(= ch "v")
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(do
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(append! chars (char-from-code 11))
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(hs-advance! 1))
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(= ch "\\")
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(do (append! chars "\\") (hs-advance! 1))
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(= ch quote-char)
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(do (append! chars quote-char) (hs-advance! 1))
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(= ch "x")
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(do
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(hs-advance! 1)
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(if
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(and
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(< (+ pos 1) src-len)
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(hs-hex-digit? (hs-cur))
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(hs-hex-digit? (hs-peek 1)))
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(let
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((d1 (hs-hex-val (hs-cur)))
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(d2 (hs-hex-val (hs-peek 1))))
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(append!
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chars
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(char-from-code (+ (* d1 16) d2)))
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(hs-advance! 2))
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(error "Invalid hexadecimal escape: \\x")))
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:else (do
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(append! chars "\\")
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(append! chars ch)
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(hs-advance! 1)))))
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(loop))
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(= (hs-cur) quote-char)
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(hs-advance! 1)
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:else (do (append! chars (hs-cur)) (hs-advance! 1) (loop)))))
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(loop)
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(join "" chars))))
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(define
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read-template
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(fn
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()
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(let
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((chars (list)))
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(hs-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)
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nil
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(= (hs-cur) "`")
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(hs-advance! 1)
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(and
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(= (hs-cur) "$")
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(< (+ pos 1) src-len)
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(= (hs-peek 1) "{"))
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(do
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(append! chars "${")
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(hs-advance! 2)
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(let
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((depth 1))
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(define
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inner
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(fn
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()
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(when
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(and (< pos src-len) (> depth 0))
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(cond
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(= (hs-cur) "{")
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(do
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(set! depth (+ depth 1))
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(append! chars (hs-cur))
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(hs-advance! 1)
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(inner))
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(= (hs-cur) "}")
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(do
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(set! depth (- depth 1))
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(when (> depth 0) (append! chars (hs-cur)))
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(hs-advance! 1)
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(when (> depth 0) (inner)))
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:else (do
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(append! chars (hs-cur))
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(hs-advance! 1)
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(inner))))))
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(inner))
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(append! chars "}")
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(loop))
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:else (do (append! chars (hs-cur)) (hs-advance! 1) (loop)))))
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(loop)
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(join "" chars))))
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(define
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read-selector
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(fn
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()
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(let
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((chars (list)))
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(hs-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)
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nil
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(and
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(= (hs-cur) "/")
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(< (+ pos 1) src-len)
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(= (hs-peek 1) ">"))
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(hs-advance! 2)
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:else (do (append! chars (hs-cur)) (hs-advance! 1) (loop)))))
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(loop)
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(join "" chars))))
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(define
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read-class-name
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(fn
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(start)
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(define
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build-name
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(fn
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(acc depth)
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(cond
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((and (< pos src-len) (= (hs-cur) "\\") (< (+ pos 1) src-len))
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(do
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(hs-advance! 1)
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(let
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((c (hs-cur)))
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(hs-advance! 1)
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(build-name (str acc c) depth))))
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((and (< pos src-len) (= (hs-cur) "["))
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(do
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(let
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((c (hs-cur)))
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(hs-advance! 1)
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(build-name (str acc c) (+ depth 1)))))
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((and (< pos src-len) (= (hs-cur) "]"))
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(do
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(let
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((c (hs-cur)))
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(hs-advance! 1)
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(build-name
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(str acc c)
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(if (> depth 0) (- depth 1) 0)))))
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((and (< pos src-len) (> depth 0) (or (= (hs-cur) "(") (= (hs-cur) ")")))
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(do
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(let
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((c (hs-cur)))
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(hs-advance! 1)
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(build-name (str acc c) depth))))
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((and (< pos src-len) (or (hs-ident-char? (hs-cur)) (= (hs-cur) ":") (= (hs-cur) "&")))
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(do
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(let
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((c (hs-cur)))
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(hs-advance! 1)
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(build-name (str acc c) depth))))
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(true acc))))
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(build-name "" 0)))
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(define
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hs-emit!
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(fn
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(type value start)
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(let
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((end-pos
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(max pos (+ start (if (nil? value) 0 (len (str value))))))
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(newlines-after-start
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(- (len (split (slice src start (max start pos)) "\n")) 1))
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(start-line (- current-line newlines-after-start)))
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(append!
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tokens
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(hs-make-token type value start end-pos start-line)))))
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(define
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scan!
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(fn
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()
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(let
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((ws-start pos))
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(skip-ws!)
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(when
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(and (> (len tokens) 0) (> pos ws-start))
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(hs-emit! "whitespace" (slice src ws-start pos) ws-start)))
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(when
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(< pos src-len)
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(let
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((ch (hs-cur)) (start pos))
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(cond
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(and (= ch "-") (< (+ pos 1) src-len) (= (hs-peek 1) "-"))
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(do (hs-advance! 2) (skip-comment!) (scan!))
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(and (= ch "/") (< (+ pos 1) src-len) (= (hs-peek 1) "/"))
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(do (hs-advance! 2) (skip-comment!) (scan!))
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(and
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(= ch "<")
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(< (+ pos 1) src-len)
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(not (= (hs-peek 1) "="))
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(or
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(hs-letter? (hs-peek 1))
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(= (hs-peek 1) ".")
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(= (hs-peek 1) "#")
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(= (hs-peek 1) "[")
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(= (hs-peek 1) "*")
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(= (hs-peek 1) ":")
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(= (hs-peek 1) "$")))
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(do (hs-emit! "selector" (read-selector) start) (scan!))
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(and (= ch ".") (< (+ pos 1) src-len) (= (hs-peek 1) "."))
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(do (hs-emit! "op" ".." start) (hs-advance! 2) (scan!))
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|
(and
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(= ch ".")
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(< (+ pos 1) src-len)
|
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(or
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(hs-letter? (hs-peek 1))
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(= (hs-peek 1) "-")
|
|
(= (hs-peek 1) "_"))
|
|
(> (len tokens) 0)
|
|
(let
|
|
((lt (dict-get (nth tokens (- (len tokens) 1)) :type)))
|
|
(or
|
|
(= lt "paren-close")
|
|
(= lt "brace-close")
|
|
(= lt "bracket-close"))))
|
|
(do (hs-emit! "dot" "." start) (hs-advance! 1) (scan!))
|
|
(and
|
|
(= ch ".")
|
|
(< (+ pos 1) src-len)
|
|
(or
|
|
(hs-letter? (hs-peek 1))
|
|
(= (hs-peek 1) "-")
|
|
(= (hs-peek 1) "_")))
|
|
(do
|
|
(hs-advance! 1)
|
|
(hs-emit! "class" (read-class-name pos) start)
|
|
(scan!))
|
|
(and
|
|
(= ch "#")
|
|
(< (+ pos 1) src-len)
|
|
(hs-ident-start? (hs-peek 1))
|
|
(> (len tokens) 0)
|
|
(let
|
|
((lt (dict-get (nth tokens (- (len tokens) 1)) :type)))
|
|
(or
|
|
(= lt "paren-close")
|
|
(= lt "brace-close")
|
|
(= lt "bracket-close"))))
|
|
(do (hs-emit! "op" "#" start) (hs-advance! 1) (scan!))
|
|
(and
|
|
(= ch "#")
|
|
(< (+ pos 1) src-len)
|
|
(hs-ident-start? (hs-peek 1)))
|
|
(do
|
|
(hs-advance! 1)
|
|
(hs-emit! "id" (read-ident pos) start)
|
|
(scan!))
|
|
(and
|
|
(= ch "@")
|
|
(< (+ pos 1) src-len)
|
|
(hs-ident-char? (hs-peek 1)))
|
|
(do
|
|
(hs-advance! 1)
|
|
(hs-emit! "attr" (read-ident pos) start)
|
|
(scan!))
|
|
(and
|
|
(= ch "^")
|
|
(< (+ pos 1) src-len)
|
|
(hs-ident-char? (hs-peek 1)))
|
|
(do
|
|
(hs-advance! 1)
|
|
(hs-emit! "hat" (read-ident pos) start)
|
|
(scan!))
|
|
(and
|
|
(= ch "~")
|
|
(< (+ pos 1) src-len)
|
|
(hs-letter? (hs-peek 1)))
|
|
(do
|
|
(hs-advance! 1)
|
|
(hs-emit! "component" (str "~" (read-ident pos)) start)
|
|
(scan!))
|
|
(and
|
|
(= ch "*")
|
|
(< (+ pos 1) src-len)
|
|
(hs-letter? (hs-peek 1)))
|
|
(do
|
|
(hs-advance! 1)
|
|
(hs-emit! "style" (read-ident pos) start)
|
|
(scan!))
|
|
(and
|
|
(= ch ":")
|
|
(< (+ pos 1) src-len)
|
|
(hs-ident-start? (hs-peek 1)))
|
|
(do
|
|
(hs-advance! 1)
|
|
(hs-emit! "local" (read-ident pos) start)
|
|
(scan!))
|
|
(or
|
|
(= ch "\"")
|
|
(and
|
|
(= ch "'")
|
|
(not
|
|
(and
|
|
(< (+ pos 1) src-len)
|
|
(= (hs-peek 1) "s")
|
|
(or
|
|
(>= (+ pos 2) src-len)
|
|
(not (hs-ident-char? (hs-peek 2))))))))
|
|
(do (hs-emit! "string" (read-string ch) start) (scan!))
|
|
(= ch "`")
|
|
(do (hs-emit! "template" (read-template) start) (scan!))
|
|
(hs-digit? ch)
|
|
(do (hs-emit! "number" (read-number start) start) (scan!))
|
|
(hs-ident-start? ch)
|
|
(do
|
|
(let
|
|
((word (read-ident start)))
|
|
(let
|
|
((full-word (if (and (< pos src-len) (= (hs-cur) "'") (< (+ pos 1) src-len) (hs-letter? (hs-peek 1)) (not (and (= (hs-peek 1) "s") (or (>= (+ pos 2) src-len) (not (hs-ident-char? (hs-peek 2))))))) (do (hs-advance! 1) (str word "'" (read-ident pos))) word)))
|
|
(hs-emit!
|
|
(if (hs-keyword? full-word) "keyword" "ident")
|
|
full-word
|
|
start)))
|
|
(scan!))
|
|
(and
|
|
(or (= ch "=") (= ch "!") (= ch "<") (= ch ">"))
|
|
(< (+ pos 1) src-len)
|
|
(= (hs-peek 1) "="))
|
|
(do
|
|
(if
|
|
(and
|
|
(or (= ch "=") (= ch "!"))
|
|
(< (+ pos 2) src-len)
|
|
(= (hs-peek 2) "="))
|
|
(do (hs-emit! "op" (str ch "==") start) (hs-advance! 3))
|
|
(do (hs-emit! "op" (str ch "=") start) (hs-advance! 2)))
|
|
(scan!))
|
|
(and
|
|
(= ch "'")
|
|
(< (+ pos 1) src-len)
|
|
(= (hs-peek 1) "s")
|
|
(or
|
|
(>= (+ pos 2) src-len)
|
|
(not (hs-ident-char? (hs-peek 2)))))
|
|
(do (hs-emit! "op" "'s" start) (hs-advance! 2) (scan!))
|
|
(= ch "(")
|
|
(do
|
|
(hs-emit! "paren-open" "(" start)
|
|
(hs-advance! 1)
|
|
(scan!))
|
|
(= ch ")")
|
|
(do
|
|
(hs-emit! "paren-close" ")" start)
|
|
(hs-advance! 1)
|
|
(scan!))
|
|
(= ch "[")
|
|
(do
|
|
(hs-emit! "bracket-open" "[" start)
|
|
(hs-advance! 1)
|
|
(scan!))
|
|
(= ch "]")
|
|
(do
|
|
(hs-emit! "bracket-close" "]" start)
|
|
(hs-advance! 1)
|
|
(scan!))
|
|
(= ch "{")
|
|
(do
|
|
(hs-emit! "brace-open" "{" start)
|
|
(hs-advance! 1)
|
|
(scan!))
|
|
(= ch "}")
|
|
(do
|
|
(hs-emit! "brace-close" "}" start)
|
|
(hs-advance! 1)
|
|
(scan!))
|
|
(= ch ",")
|
|
(do (hs-emit! "comma" "," start) (hs-advance! 1) (scan!))
|
|
(= ch "+")
|
|
(do (hs-emit! "op" "+" start) (hs-advance! 1) (scan!))
|
|
(= ch "-")
|
|
(do (hs-emit! "op" "-" start) (hs-advance! 1) (scan!))
|
|
(= ch "/")
|
|
(do (hs-emit! "op" "/" start) (hs-advance! 1) (scan!))
|
|
(= ch "=")
|
|
(do (hs-emit! "op" "=" start) (hs-advance! 1) (scan!))
|
|
(= ch "<")
|
|
(do (hs-emit! "op" "<" start) (hs-advance! 1) (scan!))
|
|
(= ch ">")
|
|
(do (hs-emit! "op" ">" start) (hs-advance! 1) (scan!))
|
|
(= ch "!")
|
|
(do (hs-emit! "op" "!" start) (hs-advance! 1) (scan!))
|
|
(= ch "*")
|
|
(do (hs-emit! "op" "*" start) (hs-advance! 1) (scan!))
|
|
(= ch "%")
|
|
(do (hs-emit! "op" "%" start) (hs-advance! 1) (scan!))
|
|
(= ch ".")
|
|
(do (hs-emit! "dot" "." start) (hs-advance! 1) (scan!))
|
|
(= ch "\\")
|
|
(do (hs-emit! "op" "\\" start) (hs-advance! 1) (scan!))
|
|
(= ch ":")
|
|
(do (hs-emit! "colon" ":" start) (hs-advance! 1) (scan!))
|
|
(= ch "|")
|
|
(do (hs-emit! "op" "|" start) (hs-advance! 1) (scan!))
|
|
(= ch "&")
|
|
(do (hs-emit! "op" "&" start) (hs-advance! 1) (scan!))
|
|
(= ch "#")
|
|
(do (hs-emit! "op" "#" start) (hs-advance! 1) (scan!))
|
|
(= ch "?")
|
|
(do (hs-emit! "op" "?" start) (hs-advance! 1) (scan!))
|
|
(= ch ";")
|
|
(do (hs-emit! "op" ";" start) (hs-advance! 1) (scan!))
|
|
:else (do (hs-advance! 1) (scan!)))))))
|
|
(scan!)
|
|
(hs-emit! "eof" nil pos)
|
|
tokens)))
|
|
|
|
;; ── Template-mode tokenizer (E37 API) ────────────────────────────────
|
|
;; Used by hs-tokens-of when :template flag is set.
|
|
;; Emits outer " chars as single STRING tokens; ${ ... } as $ { <inner-tokens> };
|
|
;; inner content is tokenized with the regular hs-tokenize.
|
|
|
|
(define
|
|
hs-tokenize-template
|
|
(fn
|
|
(src)
|
|
(let
|
|
((tokens (list)) (pos 0) (src-len (len src)) (current-line 1))
|
|
(define t-cur (fn () (if (< pos src-len) (nth src pos) nil)))
|
|
(define t-peek (fn (n) (if (< (+ pos n) src-len) (nth src (+ pos n)) nil)))
|
|
(define
|
|
t-advance!
|
|
(fn (n)
|
|
(let ((new-pos (+ pos n)))
|
|
(define
|
|
t-count-nl!
|
|
(fn (i)
|
|
(when (< i new-pos)
|
|
(when (= (nth src i) "\n")
|
|
(set! current-line (+ current-line 1)))
|
|
(t-count-nl! (+ i 1)))))
|
|
(t-count-nl! pos)
|
|
(set! pos new-pos))))
|
|
(define
|
|
t-emit!
|
|
(fn (type value)
|
|
(let
|
|
((end-pos (+ pos (if (nil? value) 0 (len (str value))))))
|
|
(append!
|
|
tokens
|
|
(hs-make-token type value pos end-pos current-line)))))
|
|
(define
|
|
scan-to-close!
|
|
(fn
|
|
(depth)
|
|
(when
|
|
(and (< pos src-len) (> depth 0))
|
|
(cond
|
|
(= (t-cur) "{")
|
|
(do (t-advance! 1) (scan-to-close! (+ depth 1)))
|
|
(= (t-cur) "}")
|
|
(when (> (- depth 1) 0) (t-advance! 1) (scan-to-close! (- depth 1)))
|
|
:else (do (t-advance! 1) (scan-to-close! depth))))))
|
|
(define
|
|
scan-template!
|
|
(fn
|
|
()
|
|
(when
|
|
(< pos src-len)
|
|
(let
|
|
((ch (t-cur)))
|
|
(cond
|
|
(= ch "\"")
|
|
(do (t-emit! "string" "\"") (t-advance! 1) (scan-template!))
|
|
(and (= ch "$") (= (t-peek 1) "{"))
|
|
(do
|
|
(t-emit! "op" "$")
|
|
(t-advance! 1)
|
|
(t-emit! "brace-open" "{")
|
|
(t-advance! 1)
|
|
(let
|
|
((inner-start pos))
|
|
(scan-to-close! 1)
|
|
(let
|
|
((inner-src (slice src inner-start pos))
|
|
(inner-toks (hs-tokenize inner-src)))
|
|
(for-each
|
|
(fn (tok)
|
|
(when (not (= (get tok "type") "eof"))
|
|
(append! tokens tok)))
|
|
inner-toks))
|
|
(t-emit! "brace-close" "}")
|
|
(when (< pos src-len) (t-advance! 1)))
|
|
(scan-template!))
|
|
(= ch "$")
|
|
(do (t-emit! "op" "$") (t-advance! 1) (scan-template!))
|
|
(hs-ws? ch)
|
|
(do (t-advance! 1) (scan-template!))
|
|
:else (do (t-advance! 1) (scan-template!)))))))
|
|
(scan-template!)
|
|
(t-emit! "eof" nil)
|
|
tokens)))
|
|
|
|
;; ── Stream wrapper for upstream-style stateful tokenizer API ───────────────
|
|
;;
|
|
;; Upstream _hyperscript exposes a Tokens object with cursor + follow-set
|
|
;; semantics on _hyperscript.internals.tokenizer. Our hs-tokenize returns a
|
|
;; flat list; the stream wrapper adds the stateful operations.
|
|
;;
|
|
;; Type names map ours → upstream's (e.g. "ident" → "IDENTIFIER").
|
|
|
|
(define
|
|
hs-stream-type-map
|
|
(fn
|
|
(t)
|
|
(cond
|
|
((= t "ident") "IDENTIFIER")
|
|
((= t "number") "NUMBER")
|
|
((= t "string") "STRING")
|
|
((= t "class") "CLASS_REF")
|
|
((= t "id") "ID_REF")
|
|
((= t "attr") "ATTRIBUTE_REF")
|
|
((= t "style") "STYLE_REF")
|
|
((= t "whitespace") "WHITESPACE")
|
|
((= t "op") "OPERATOR")
|
|
((= t "eof") "EOF")
|
|
(true (upcase t)))))
|
|
|
|
;; Create a stream from a source string.
|
|
;; Returns a dict — mutable via dict-set!.
|
|
(define
|
|
hs-stream
|
|
(fn
|
|
(src)
|
|
{:tokens (hs-tokenize src) :pos 0 :follows (list) :last-match nil :last-ws nil}))
|
|
|
|
;; Skip whitespace tokens, advancing pos to the next non-WS token.
|
|
;; Captures the last skipped whitespace value into :last-ws.
|
|
(define
|
|
hs-stream-skip-ws!
|
|
(fn
|
|
(s)
|
|
(let
|
|
((tokens (get s :tokens)))
|
|
(define
|
|
loop
|
|
(fn
|
|
()
|
|
(let
|
|
((p (get s :pos)))
|
|
(when
|
|
(and (< p (len tokens))
|
|
(= (get (nth tokens p) :type) "whitespace"))
|
|
(do
|
|
(dict-set! s :last-ws (get (nth tokens p) :value))
|
|
(dict-set! s :pos (+ p 1))
|
|
(loop))))))
|
|
(loop))))
|
|
|
|
;; Current token (after skipping whitespace).
|
|
(define
|
|
hs-stream-current
|
|
(fn
|
|
(s)
|
|
(do
|
|
(hs-stream-skip-ws! s)
|
|
(let
|
|
((tokens (get s :tokens)) (p (get s :pos)))
|
|
(if (< p (len tokens)) (nth tokens p) nil)))))
|
|
|
|
;; Returns the current token if its value matches; advances and updates
|
|
;; :last-match. Returns nil otherwise (no advance).
|
|
;; Honors the follow set: tokens whose value is in :follows do NOT match.
|
|
(define
|
|
hs-stream-match
|
|
(fn
|
|
(s value)
|
|
(let
|
|
((cur (hs-stream-current s)))
|
|
(cond
|
|
((nil? cur) nil)
|
|
((some (fn (f) (= f value)) (get s :follows)) nil)
|
|
((= (get cur :value) value)
|
|
(do
|
|
(dict-set! s :pos (+ (get s :pos) 1))
|
|
(dict-set! s :last-match cur)
|
|
cur))
|
|
(true nil)))))
|
|
|
|
;; Match by upstream-style type name. Accepts any number of allowed types.
|
|
(define
|
|
hs-stream-match-type
|
|
(fn
|
|
(s &rest types)
|
|
(let
|
|
((cur (hs-stream-current s)))
|
|
(cond
|
|
((nil? cur) nil)
|
|
((some (fn (t) (= (hs-stream-type-map (get cur :type)) t)) types)
|
|
(do
|
|
(dict-set! s :pos (+ (get s :pos) 1))
|
|
(dict-set! s :last-match cur)
|
|
cur))
|
|
(true nil)))))
|
|
|
|
;; Match if value is one of the given names.
|
|
(define
|
|
hs-stream-match-any
|
|
(fn
|
|
(s &rest names)
|
|
(let
|
|
((cur (hs-stream-current s)))
|
|
(cond
|
|
((nil? cur) nil)
|
|
((some (fn (n) (= (get cur :value) n)) names)
|
|
(do
|
|
(dict-set! s :pos (+ (get s :pos) 1))
|
|
(dict-set! s :last-match cur)
|
|
cur))
|
|
(true nil)))))
|
|
|
|
;; Match an op token whose value is in the list.
|
|
(define
|
|
hs-stream-match-any-op
|
|
(fn
|
|
(s &rest ops)
|
|
(let
|
|
((cur (hs-stream-current s)))
|
|
(cond
|
|
((nil? cur) nil)
|
|
((and (= (get cur :type) "op")
|
|
(some (fn (o) (= (get cur :value) o)) ops))
|
|
(do
|
|
(dict-set! s :pos (+ (get s :pos) 1))
|
|
(dict-set! s :last-match cur)
|
|
cur))
|
|
(true nil)))))
|
|
|
|
;; Peek N non-WS tokens ahead. Returns the token if its value matches; nil otherwise.
|
|
(define
|
|
hs-stream-peek
|
|
(fn
|
|
(s value offset)
|
|
(let
|
|
((tokens (get s :tokens)))
|
|
(define
|
|
skip-n-non-ws
|
|
(fn
|
|
(p remaining)
|
|
(cond
|
|
((>= p (len tokens)) -1)
|
|
((= (get (nth tokens p) :type) "whitespace")
|
|
(skip-n-non-ws (+ p 1) remaining))
|
|
((= remaining 0) p)
|
|
(true (skip-n-non-ws (+ p 1) (- remaining 1))))))
|
|
(let
|
|
((p (skip-n-non-ws (get s :pos) offset)))
|
|
(if (and (>= p 0) (< p (len tokens))
|
|
(= (get (nth tokens p) :value) value))
|
|
(nth tokens p)
|
|
nil)))))
|
|
|
|
;; Consume tokens until one whose value matches the marker. Returns
|
|
;; the consumed list (excluding the marker). Marker becomes current.
|
|
(define
|
|
hs-stream-consume-until
|
|
(fn
|
|
(s marker)
|
|
(let
|
|
((tokens (get s :tokens)) (out (list)))
|
|
(define
|
|
loop
|
|
(fn
|
|
(acc)
|
|
(let
|
|
((p (get s :pos)))
|
|
(cond
|
|
((>= p (len tokens)) acc)
|
|
((= (get (nth tokens p) :value) marker) acc)
|
|
(true
|
|
(do
|
|
(dict-set! s :pos (+ p 1))
|
|
(loop (append acc (list (nth tokens p))))))))))
|
|
(loop out))))
|
|
|
|
;; Consume until the next whitespace token; returns the consumed list.
|
|
(define
|
|
hs-stream-consume-until-ws
|
|
(fn
|
|
(s)
|
|
(let
|
|
((tokens (get s :tokens)))
|
|
(define
|
|
loop
|
|
(fn
|
|
(acc)
|
|
(let
|
|
((p (get s :pos)))
|
|
(cond
|
|
((>= p (len tokens)) acc)
|
|
((= (get (nth tokens p) :type) "whitespace") acc)
|
|
(true
|
|
(do
|
|
(dict-set! s :pos (+ p 1))
|
|
(loop (append acc (list (nth tokens p))))))))))
|
|
(loop (list)))))
|
|
|
|
;; Follow-set management.
|
|
(define hs-stream-push-follow! (fn (s v) (dict-set! s :follows (cons v (get s :follows)))))
|
|
(define
|
|
hs-stream-pop-follow!
|
|
(fn (s) (let ((f (get s :follows))) (when (> (len f) 0) (dict-set! s :follows (rest f))))))
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(define
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hs-stream-push-follows!
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(fn (s vs) (for-each (fn (v) (hs-stream-push-follow! s v)) vs)))
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(define
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hs-stream-pop-follows!
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(fn (s n) (when (> n 0) (do (hs-stream-pop-follow! s) (hs-stream-pop-follows! s (- n 1))))))
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(define
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hs-stream-clear-follows!
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(fn (s) (let ((saved (get s :follows))) (do (dict-set! s :follows (list)) saved))))
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(define
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hs-stream-restore-follows!
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(fn (s saved) (dict-set! s :follows saved)))
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;; Last-consumed token / whitespace.
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(define hs-stream-last-match (fn (s) (get s :last-match)))
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(define hs-stream-last-ws (fn (s) (get s :last-ws))) |