Step 18 (part 4): _hyperscript compiler — AST → SX expressions
lib/hyperscript/compiler.sx — transforms parsed hyperscript AST into
SX expressions targeting web/lib/dom.sx primitives. Two entry points:
hs-to-sx — AST node → SX expression
hs-to-sx-from-source — source string → SX (tokenize+parse+emit)
Compiler handles:
Expressions: me/it/event, refs, queries, attrs, styles, locals,
arithmetic, comparison, boolean, array literals, property access,
DOM traversal (closest/next/previous/first/last), type conversion,
membership test, exists/empty/matches/contains predicates
Commands: add/remove/toggle class, set (var/attr/style/prop dispatch),
put, if/else, do, wait, wait-for, log, send, trigger, hide, show,
transition, repeat, fetch, call, return, throw, settle, go, append,
tell (rebinds me), for, take, make, install, measure, inc/dec
Features: on (with from/filter/every), init, def, behavior
Maps to SX primitives: dom-add-class, dom-set-attr, dom-set-style,
dom-set-prop, dom-query, dom-closest, dom-dispatch, dom-append, etc.
33 compiler tests across 10 suites. 3076/3076 full build, zero regressions.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
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lib/hyperscript/compiler.sx
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lib/hyperscript/compiler.sx
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;; _hyperscript compiler — AST → SX expressions
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;;
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;; Input: AST from hs-parse (list structures)
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;; Output: SX expressions targeting web/lib/dom.sx primitives
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;;
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;; Usage:
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;; (hs-to-sx (hs-compile "on click add .active to me"))
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;; → (hs-on me "click" (fn (event) (dom-add-class me "active")))
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(define
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hs-to-sx
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(let
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((dot-sym (make-symbol ".")) (pct-sym (make-symbol "%")))
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(define emit-target (fn (ast) (hs-to-sx ast)))
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(define
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emit-set
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(fn
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(target value)
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(if
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(not (list? target))
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(list (quote set!) target value)
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(let
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((th (first target)))
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(cond
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((= th dot-sym)
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(list
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(quote dom-set-prop)
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(hs-to-sx (nth target 1))
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(nth target 2)
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value))
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((= th (quote attr))
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(list
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(quote dom-set-attr)
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(hs-to-sx (nth target 2))
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(nth target 1)
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value))
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((= th (quote style))
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(list
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(quote dom-set-style)
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(hs-to-sx (nth target 2))
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(nth target 1)
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value))
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((= th (quote ref))
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(list (quote set!) (make-symbol (nth target 1)) value))
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((= th (quote local))
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(list (quote set!) (make-symbol (nth target 1)) value))
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((= th (quote me))
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(list (quote dom-set-inner-html) (quote me) value))
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((= th (quote it)) (list (quote set!) (quote it) value))
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(true (list (quote set!) (hs-to-sx target) value)))))))
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(define
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emit-on
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(fn
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(ast)
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(let
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((parts (rest ast)))
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(let
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((event-name (first parts)))
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(define
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scan-on
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(fn
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(items source filter every?)
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(cond
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((<= (len items) 1)
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(let
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((body (if (> (len items) 0) (first items) nil)))
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(let
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((target (if source (hs-to-sx source) (quote me))))
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(let
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((handler (list (quote fn) (list (quote event)) (hs-to-sx body))))
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(if
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every?
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(list
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(quote hs-on-every)
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target
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event-name
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handler)
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(list (quote hs-on) target event-name handler))))))
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((= (first items) :from)
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(scan-on
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(rest (rest items))
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(nth items 1)
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filter
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every?))
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((= (first items) :filter)
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(scan-on
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(rest (rest items))
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source
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(nth items 1)
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every?))
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((= (first items) :every)
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(scan-on (rest (rest items)) source filter true))
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(true (scan-on (rest items) source filter every?)))))
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(scan-on (rest parts) nil nil false)))))
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(define
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emit-send
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(fn
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(ast)
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(let
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((name (nth ast 1)) (rest-parts (rest (rest ast))))
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(cond
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((and (= (len ast) 4) (list? (nth ast 2)) (= (first (nth ast 2)) (quote dict)))
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(list
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(quote dom-dispatch)
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(hs-to-sx (nth ast 3))
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name
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(hs-to-sx (nth ast 2))))
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((= (len ast) 3)
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(list (quote dom-dispatch) (hs-to-sx (nth ast 2)) name nil))
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(true (list (quote dom-dispatch) (quote me) name nil))))))
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(define
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emit-repeat
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(fn
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(ast)
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(let
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((mode (nth ast 1)) (body (hs-to-sx (nth ast 2))))
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(cond
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((and (list? mode) (= (first mode) (quote forever)))
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(list
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(quote hs-repeat-forever)
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(list (quote fn) (list) body)))
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((and (list? mode) (= (first mode) (quote times)))
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(list
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(quote hs-repeat-times)
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(hs-to-sx (nth mode 1))
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(list (quote fn) (list) body)))
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((number? mode)
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(list
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(quote hs-repeat-times)
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mode
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(list (quote fn) (list) body)))
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(true
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(list
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(quote hs-repeat-times)
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(hs-to-sx mode)
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(list (quote fn) (list) body)))))))
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(define
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emit-for
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(fn
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(ast)
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(let
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((var-name (nth ast 1))
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(collection (hs-to-sx (nth ast 2)))
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(body (hs-to-sx (nth ast 3))))
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(if
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(and (> (len ast) 4) (= (nth ast 4) :index))
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(list
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(quote for-each)
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(list
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(quote fn)
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(list (make-symbol var-name) (make-symbol (nth ast 5)))
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body)
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collection)
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(list
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(quote for-each)
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(list (quote fn) (list (make-symbol var-name)) body)
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collection)))))
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(define
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emit-wait-for
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(fn
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(ast)
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(let
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((event-name (nth ast 1)))
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(if
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(and (> (len ast) 2) (= (nth ast 2) :from))
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(list (quote hs-wait-for) (hs-to-sx (nth ast 3)) event-name)
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(list (quote hs-wait-for) (quote me) event-name)))))
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(define
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emit-transition
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(fn
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(ast)
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(let
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((prop (nth ast 1)) (value (hs-to-sx (nth ast 2))))
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(if
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(= (len ast) 5)
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(list
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(quote hs-transition)
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(hs-to-sx (nth ast 4))
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prop
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value
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(nth ast 3))
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(list
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(quote hs-transition)
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(hs-to-sx (nth ast 3))
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prop
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value
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nil)))))
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(define
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emit-make
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(fn
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(ast)
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(if
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(= (len ast) 3)
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(list
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(quote let)
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(list
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(list
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(make-symbol (nth ast 2))
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(list (quote hs-make) (nth ast 1))))
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(make-symbol (nth ast 2)))
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(list (quote hs-make) (nth ast 1)))))
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(define
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emit-inc
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(fn
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(target)
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(let
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((t (hs-to-sx target)))
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(if
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(and (list? target) (= (first target) (quote attr)))
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(list
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(quote dom-set-attr)
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(hs-to-sx (nth target 2))
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(nth target 1)
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(list
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(quote +)
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(list
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(quote dom-get-attr)
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(hs-to-sx (nth target 2))
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(nth target 1))
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1))
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(list (quote set!) t (list (quote +) t 1))))))
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(define
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emit-dec
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(fn
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(target)
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(let
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((t (hs-to-sx target)))
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(if
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(and (list? target) (= (first target) (quote attr)))
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(list
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(quote dom-set-attr)
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(hs-to-sx (nth target 2))
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(nth target 1)
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(list
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(quote -)
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(list
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(quote dom-get-attr)
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(hs-to-sx (nth target 2))
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(nth target 1))
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1))
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(list (quote set!) t (list (quote -) t 1))))))
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(define
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emit-behavior
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(fn
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(ast)
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(let
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((name (nth ast 1)) (params (nth ast 2)) (body (nth ast 3)))
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(list
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(quote define)
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(make-symbol name)
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(list
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(quote fn)
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(cons (quote me) (map make-symbol params))
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(cons (quote do) (map hs-to-sx body)))))))
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(fn
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(ast)
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(cond
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((nil? ast) nil)
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((number? ast) ast)
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((string? ast) ast)
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((boolean? ast) ast)
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((not (list? ast)) ast)
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(true
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(let
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((head (first ast)))
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(cond
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((= head (quote me)) (quote me))
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((= head (quote it)) (quote it))
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((= head (quote event)) (quote event))
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((= head dot-sym)
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(list (quote get) (hs-to-sx (nth ast 1)) (nth ast 2)))
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((= head (quote ref)) (make-symbol (nth ast 1)))
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((= head (quote query))
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(list (quote dom-query) (nth ast 1)))
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((= head (quote attr))
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(list
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(quote dom-get-attr)
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(hs-to-sx (nth ast 2))
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(nth ast 1)))
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((= head (quote style))
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(list
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(quote dom-get-style)
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(hs-to-sx (nth ast 2))
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(nth ast 1)))
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((= head (quote local)) (make-symbol (nth ast 1)))
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((= head (quote array))
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(cons (quote list) (map hs-to-sx (rest ast))))
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((= head (quote not))
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(list (quote not) (hs-to-sx (nth ast 1))))
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((= head (quote no))
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(list (quote not) (hs-to-sx (nth ast 1))))
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((= head (quote and))
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(list
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(quote and)
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(hs-to-sx (nth ast 1))
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(hs-to-sx (nth ast 2))))
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((= head (quote or))
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(list
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(quote or)
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(hs-to-sx (nth ast 1))
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(hs-to-sx (nth ast 2))))
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((= head (quote =))
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(list
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(quote =)
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(hs-to-sx (nth ast 1))
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(hs-to-sx (nth ast 2))))
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((= head (quote +))
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(list
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(quote +)
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(hs-to-sx (nth ast 1))
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(hs-to-sx (nth ast 2))))
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((= head (quote -))
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(list
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(quote -)
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(hs-to-sx (nth ast 1))
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(hs-to-sx (nth ast 2))))
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((= head (quote *))
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(list
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(quote *)
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(hs-to-sx (nth ast 1))
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(hs-to-sx (nth ast 2))))
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((= head (quote /))
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(list
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(quote /)
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(hs-to-sx (nth ast 1))
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(hs-to-sx (nth ast 2))))
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((= head pct-sym)
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(list
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pct-sym
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(hs-to-sx (nth ast 1))
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(hs-to-sx (nth ast 2))))
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((= head (quote empty?))
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(list (quote empty?) (hs-to-sx (nth ast 1))))
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((= head (quote exists?))
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(list
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(quote not)
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(list (quote nil?) (hs-to-sx (nth ast 1)))))
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((= head (quote matches?))
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(list
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(quote dom-matches?)
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(hs-to-sx (nth ast 1))
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(hs-to-sx (nth ast 2))))
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((= head (quote contains?))
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(list
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(quote contains?)
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(hs-to-sx (nth ast 1))
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(hs-to-sx (nth ast 2))))
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((= head (quote as))
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(list (quote hs-coerce) (hs-to-sx (nth ast 1)) (nth ast 2)))
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((= head (quote in?))
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(list
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(quote contains?)
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(hs-to-sx (nth ast 2))
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(hs-to-sx (nth ast 1))))
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((= head (quote of))
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(list
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(quote get)
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(hs-to-sx (nth ast 2))
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(hs-to-sx (nth ast 1))))
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((= head "!=")
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(list
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(quote not)
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(list
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(quote =)
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(hs-to-sx (nth ast 1))
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(hs-to-sx (nth ast 2)))))
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((= head "<")
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(list
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(quote <)
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(hs-to-sx (nth ast 1))
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(hs-to-sx (nth ast 2))))
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((= head ">")
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(list
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(quote >)
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(hs-to-sx (nth ast 1))
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(hs-to-sx (nth ast 2))))
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((= head "<=")
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(list
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(quote <=)
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(hs-to-sx (nth ast 1))
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(hs-to-sx (nth ast 2))))
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((= head ">=")
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(list
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(quote >=)
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(hs-to-sx (nth ast 1))
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(hs-to-sx (nth ast 2))))
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((= head (quote closest))
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(list
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(quote dom-closest)
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(hs-to-sx (nth ast 2))
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(nth ast 1)))
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((= head (quote next))
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(list (quote hs-next) (hs-to-sx (nth ast 2)) (nth ast 1)))
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((= head (quote previous))
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(list
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(quote hs-previous)
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(hs-to-sx (nth ast 2))
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(nth ast 1)))
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((= head (quote first))
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(if
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(> (len ast) 2)
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(list
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(quote hs-first)
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(hs-to-sx (nth ast 2))
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(nth ast 1))
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(list (quote hs-query-first) (nth ast 1))))
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((= head (quote last))
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(if
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(> (len ast) 2)
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(list (quote hs-last) (hs-to-sx (nth ast 2)) (nth ast 1))
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(list (quote hs-query-last) (nth ast 1))))
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((= head (quote add-class))
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(list
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(quote dom-add-class)
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(hs-to-sx (nth ast 2))
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(nth ast 1)))
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((= head (quote remove-class))
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(list
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(quote dom-remove-class)
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(hs-to-sx (nth ast 2))
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(nth ast 1)))
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((= head (quote toggle-class))
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(list
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(quote hs-toggle-class!)
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(hs-to-sx (nth ast 2))
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(nth ast 1)))
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((= head (quote toggle-between))
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(list
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(quote hs-toggle-between!)
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(hs-to-sx (nth ast 3))
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(nth ast 1)
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(nth ast 2)))
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((= head (quote set!))
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(emit-set (nth ast 1) (hs-to-sx (nth ast 2))))
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((= head (quote put!))
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(list
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(quote hs-put!)
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(hs-to-sx (nth ast 1))
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(nth ast 2)
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(hs-to-sx (nth ast 3))))
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((= head (quote if))
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(if
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(> (len ast) 3)
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(list
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(quote if)
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(hs-to-sx (nth ast 1))
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(hs-to-sx (nth ast 2))
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(hs-to-sx (nth ast 3)))
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(list
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(quote when)
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(hs-to-sx (nth ast 1))
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(hs-to-sx (nth ast 2)))))
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((= head (quote do))
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(cons (quote do) (map hs-to-sx (rest ast))))
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((= head (quote wait)) (list (quote hs-wait) (nth ast 1)))
|
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((= head (quote wait-for)) (emit-wait-for ast))
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((= head (quote log))
|
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(list (quote log) (hs-to-sx (nth ast 1))))
|
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((= head (quote send)) (emit-send ast))
|
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((= head (quote trigger))
|
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(list
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(quote dom-dispatch)
|
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(hs-to-sx (nth ast 2))
|
||||
(nth ast 1)
|
||||
nil))
|
||||
((= head (quote hide))
|
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(list
|
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(quote dom-set-style)
|
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(hs-to-sx (nth ast 1))
|
||||
"display"
|
||||
"none"))
|
||||
((= head (quote show))
|
||||
(list
|
||||
(quote dom-set-style)
|
||||
(hs-to-sx (nth ast 1))
|
||||
"display"
|
||||
""))
|
||||
((= head (quote transition)) (emit-transition ast))
|
||||
((= head (quote repeat)) (emit-repeat ast))
|
||||
((= head (quote fetch))
|
||||
(list (quote hs-fetch) (hs-to-sx (nth ast 1)) (nth ast 2)))
|
||||
((= head (quote call))
|
||||
(cons
|
||||
(make-symbol (nth ast 1))
|
||||
(map hs-to-sx (rest (rest ast)))))
|
||||
((= head (quote return)) (hs-to-sx (nth ast 1)))
|
||||
((= head (quote throw))
|
||||
(list (quote raise) (hs-to-sx (nth ast 1))))
|
||||
((= head (quote settle))
|
||||
(list (quote hs-settle) (quote me)))
|
||||
((= head (quote go))
|
||||
(list (quote hs-navigate!) (hs-to-sx (nth ast 1))))
|
||||
((= head (quote append!))
|
||||
(list
|
||||
(quote dom-append)
|
||||
(hs-to-sx (nth ast 2))
|
||||
(hs-to-sx (nth ast 1))))
|
||||
((= head (quote tell))
|
||||
(list
|
||||
(quote let)
|
||||
(list (list (quote me) (hs-to-sx (nth ast 1))))
|
||||
(hs-to-sx (nth ast 2))))
|
||||
((= head (quote for)) (emit-for ast))
|
||||
((= head (quote take))
|
||||
(list (quote hs-take!) (hs-to-sx (nth ast 2)) (nth ast 1)))
|
||||
((= head (quote make)) (emit-make ast))
|
||||
((= head (quote install))
|
||||
(cons (quote hs-install) (map hs-to-sx (rest ast))))
|
||||
((= head (quote measure))
|
||||
(list (quote hs-measure) (hs-to-sx (nth ast 1))))
|
||||
((= head (quote increment!)) (emit-inc (nth ast 1)))
|
||||
((= head (quote decrement!)) (emit-dec (nth ast 1)))
|
||||
((= head (quote on)) (emit-on ast))
|
||||
((= head (quote init))
|
||||
(list
|
||||
(quote hs-init)
|
||||
(list (quote fn) (list) (hs-to-sx (nth ast 1)))))
|
||||
((= head (quote def))
|
||||
(list
|
||||
(quote define)
|
||||
(make-symbol (nth ast 1))
|
||||
(list
|
||||
(quote fn)
|
||||
(map make-symbol (nth ast 2))
|
||||
(hs-to-sx (nth ast 3)))))
|
||||
((= head (quote behavior)) (emit-behavior ast))
|
||||
(true ast))))))))
|
||||
|
||||
;; ── Convenience: source → SX ─────────────────────────────────
|
||||
(define hs-to-sx-from-source (fn (src) (hs-to-sx (hs-compile src))))
|
||||
Reference in New Issue
Block a user