giles
3336c4e957
lib/hyperscript/tokenizer.sx — tokenizes real _hyperscript syntax into typed token stream. Handles: Keywords (on, set, add, toggle, if, then, from, etc.) DOM literals (.class, #id, @attr, *style, :local, <sel/>) Strings (single/double quoted, escapes), template literals Numbers (integers, decimals, time units: 100ms, 2s) Operators (==, !=, +, -, 's possessive) Punctuation (parens, brackets, braces, commas, dots) Line comments (// to EOL) Parser will disambiguate .name as class vs property access from context. Possessive 's correctly distinguished from single-quote strings. 2952/2952 tests, zero failures. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
515 lines
15 KiB
Plaintext
515 lines
15 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 (fn (type value pos) {:pos pos :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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;; ── 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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"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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"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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"empty"
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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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(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)))
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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 hs-advance! (fn (n) (set! pos (+ pos n))))
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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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(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-number start))
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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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(define
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read-frac
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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-frac))))
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(read-frac))
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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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nil
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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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(append! chars "\n")
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(= ch "t")
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(append! chars "\t")
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(= ch "\\")
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(append! chars "\\")
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(= ch quote-char)
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(append! chars quote-char)
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:else (do (append! chars "\\") (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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(when
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(and
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(< pos src-len)
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(or
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(hs-ident-char? (hs-cur))
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(= (hs-cur) ":")
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(= (hs-cur) "\\")
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(= (hs-cur) "[")
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(= (hs-cur) "]")
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(= (hs-cur) "(")
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(= (hs-cur) ")")))
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(when (= (hs-cur) "\\") (hs-advance! 1))
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(hs-advance! 1)
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(read-class-name start))
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(slice src start pos)))
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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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(append! tokens (hs-make-token type value start))))
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(define
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scan!
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(fn
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()
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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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((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
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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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(do (hs-emit! "selector" (read-selector) start) (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) "-")
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(= (hs-peek 1) "_")))
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(do
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(hs-advance! 1)
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(hs-emit! "class" (read-class-name pos) start)
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(scan!))
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(and
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(= ch "#")
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(< (+ pos 1) src-len)
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(hs-ident-start? (hs-peek 1)))
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(do
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(hs-advance! 1)
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(hs-emit! "id" (read-ident pos) start)
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(scan!))
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(and
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(= ch "@")
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(< (+ pos 1) src-len)
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(hs-ident-char? (hs-peek 1)))
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(do
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(hs-advance! 1)
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(hs-emit! "attr" (read-ident pos) start)
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(scan!))
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(and
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(= ch "*")
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(< (+ pos 1) src-len)
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(hs-letter? (hs-peek 1)))
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(do
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(hs-advance! 1)
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(hs-emit! "style" (read-ident pos) start)
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(scan!))
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(and
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(= ch ":")
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(< (+ pos 1) src-len)
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(hs-ident-start? (hs-peek 1)))
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(do
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(hs-advance! 1)
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(hs-emit! "local" (read-ident pos) start)
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(scan!))
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(or
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(= ch "\"")
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(and
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(= ch "'")
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(not
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(and
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(< (+ pos 1) src-len)
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(= (hs-peek 1) "s")
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(or
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(>= (+ pos 2) src-len)
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(not (hs-ident-char? (hs-peek 2))))))))
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(do (hs-emit! "string" (read-string ch) start) (scan!))
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(= ch "`")
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(do (hs-emit! "template" (read-template) start) (scan!))
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(hs-digit? ch)
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(do (hs-emit! "number" (read-number start) start) (scan!))
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(hs-ident-start? ch)
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(do
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(let
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((word (read-ident start)))
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(hs-emit!
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(if (hs-keyword? word) "keyword" "ident")
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word
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start))
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(scan!))
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(and
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(or (= ch "=") (= ch "!") (= ch "<") (= ch ">"))
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(< (+ pos 1) src-len)
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(= (hs-peek 1) "="))
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(do
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(hs-emit! "op" (str ch "=") start)
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(hs-advance! 2)
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(scan!))
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(and
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(= ch "'")
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(< (+ pos 1) src-len)
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(= (hs-peek 1) "s")
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(or
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(>= (+ pos 2) src-len)
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(not (hs-ident-char? (hs-peek 2)))))
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(do (hs-emit! "op" "'s" start) (hs-advance! 2) (scan!))
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(= ch "(")
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(do
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(hs-emit! "paren-open" "(" start)
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(hs-advance! 1)
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(scan!))
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(= ch ")")
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(do
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(hs-emit! "paren-close" ")" start)
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(hs-advance! 1)
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(scan!))
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(= ch "[")
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(do
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(hs-emit! "bracket-open" "[" start)
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(hs-advance! 1)
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(scan!))
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(= ch "]")
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(do
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(hs-emit! "bracket-close" "]" start)
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(hs-advance! 1)
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(scan!))
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(= ch "{")
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(do
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(hs-emit! "brace-open" "{" start)
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(hs-advance! 1)
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(scan!))
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(= ch "}")
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(do
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(hs-emit! "brace-close" "}" start)
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(hs-advance! 1)
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(scan!))
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(= ch ",")
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(do (hs-emit! "comma" "," start) (hs-advance! 1) (scan!))
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(= ch "+")
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(do (hs-emit! "op" "+" start) (hs-advance! 1) (scan!))
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(= ch "-")
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(do (hs-emit! "op" "-" start) (hs-advance! 1) (scan!))
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(= ch "/")
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(do (hs-emit! "op" "/" start) (hs-advance! 1) (scan!))
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(= ch "=")
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(do (hs-emit! "op" "=" start) (hs-advance! 1) (scan!))
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(= ch "<")
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(do (hs-emit! "op" "<" start) (hs-advance! 1) (scan!))
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(= ch ">")
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(do (hs-emit! "op" ">" start) (hs-advance! 1) (scan!))
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(= ch "!")
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(do (hs-emit! "op" "!" start) (hs-advance! 1) (scan!))
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(= ch ".")
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(do (hs-emit! "dot" "." start) (hs-advance! 1) (scan!))
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:else (do (hs-advance! 1) (scan!)))))))
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(scan!)
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(hs-emit! "eof" nil pos)
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tokens))) |