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rose-ash/lib/tcl/runtime.sx
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tcl: Phase 2 core commands — if/while/for/foreach/switch/break/continue/return/error/expr (+20 tests, 107 total)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-04-26 14:40:48 +00:00

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; Tcl-on-SX runtime evaluator
; State: {:frame frame :commands cmd-table :result last-result :output accumulated-output}
(define make-frame (fn (level parent) {:level level :locals {} :parent parent}))
(define
frame-lookup
(fn
(frame name)
(if
(nil? frame)
nil
(let
((val (get (get frame :locals) name)))
(if (nil? val) (frame-lookup (get frame :parent) name) val)))))
(define
frame-set-top
(fn
(frame name val)
(assoc frame :locals (assoc (get frame :locals) name val))))
(define make-tcl-interp (fn () {:result "" :output "" :code 0 :frame (make-frame 0 nil) :commands {}}))
(define
tcl-register
(fn
(interp name f)
(assoc interp :commands (assoc (get interp :commands) name f))))
(define
tcl-var-get
(fn
(interp name)
(let
((val (frame-lookup (get interp :frame) name)))
(if
(nil? val)
(error (str "can't read \"" name "\": no such variable"))
val))))
(define
tcl-var-set
(fn
(interp name val)
(assoc interp :frame (frame-set-top (get interp :frame) name val))))
(define
tcl-eval-parts
(fn
(parts interp)
(reduce
(fn
(acc part)
(let
((type (get part :type)) (cur-interp (get acc :interp)))
(cond
((equal? type "text") {:values (append (get acc :values) (list (get part :value))) :interp cur-interp})
((equal? type "var") {:values (append (get acc :values) (list (tcl-var-get cur-interp (get part :name)))) :interp cur-interp})
((equal? type "var-arr")
(let
((key-acc (tcl-eval-parts (get part :key) cur-interp)))
(let
((key (join "" (get key-acc :values)))
(next-interp (get key-acc :interp)))
{:values (append (get acc :values) (list (tcl-var-get next-interp (str (get part :name) "(" key ")")))) :interp next-interp})))
((equal? type "cmd")
(let
((new-interp (tcl-eval-string cur-interp (get part :src))))
{:values (append (get acc :values) (list (get new-interp :result))) :interp new-interp}))
(else (error (str "tcl: unknown part type: " type))))))
{:values (quote ()) :interp interp}
parts)))
(define
tcl-eval-word
(fn
(word interp)
(let
((type (get word :type)))
(cond
((equal? type "braced") {:interp interp :value (get word :value)})
((equal? type "compound")
(let
((result (tcl-eval-parts (get word :parts) interp)))
{:interp (get result :interp) :value (join "" (get result :values))}))
((equal? type "expand") (tcl-eval-word (get word :word) interp))
(else (error (str "tcl: unknown word type: " type)))))))
(define
tcl-list-split
(fn
(s)
(define chars (split s ""))
(define len-s (len chars))
(define
go
(fn
(i acc cur-item depth)
(if
(>= i len-s)
(if (> (len cur-item) 0) (append acc (list cur-item)) acc)
(let
((c (nth chars i)))
(cond
((equal? c "{")
(if
(= depth 0)
(go (+ i 1) acc "" (+ depth 1))
(go (+ i 1) acc (str cur-item c) (+ depth 1))))
((equal? c "}")
(if
(= depth 1)
(go (+ i 1) (append acc (list cur-item)) "" 0)
(go (+ i 1) acc (str cur-item c) (- depth 1))))
((equal? c " ")
(if
(and (= depth 0) (> (len cur-item) 0))
(go (+ i 1) (append acc (list cur-item)) "" 0)
(go
(+ i 1)
acc
(if (> depth 0) (str cur-item c) cur-item)
depth)))
(else (go (+ i 1) acc (str cur-item c) depth)))))))
(go 0 (list) "" 0)))
(define
tcl-eval-words
(fn
(words interp)
(reduce
(fn
(acc w)
(let
((cur-interp (get acc :interp)))
(if
(equal? (get w :type) "expand")
(let
((wr (tcl-eval-word (get w :word) cur-interp)))
{:values (append (get acc :values) (tcl-list-split (get wr :value))) :interp (get wr :interp)})
(let ((wr (tcl-eval-word w cur-interp))) {:values (append (get acc :values) (list (get wr :value))) :interp (get wr :interp)}))))
{:values (quote ()) :interp interp}
words)))
(define
tcl-eval-cmd
(fn
(interp cmd)
(let
((wr (tcl-eval-words (get cmd :words) interp)))
(let
((words (get wr :values)) (cur-interp (get wr :interp)))
(if
(= 0 (len words))
cur-interp
(let
((cmd-name (first words)) (cmd-args (rest words)))
(let
((cmd-fn (get (get cur-interp :commands) cmd-name)))
(if
(nil? cmd-fn)
(error (str "unknown command: \"" cmd-name "\""))
(cmd-fn cur-interp cmd-args)))))))))
(define
tcl-eval-script
(fn
(interp cmds)
(if
(or (= 0 (len cmds)) (not (= 0 (get interp :code))))
interp
(tcl-eval-script (tcl-eval-cmd interp (first cmds)) (rest cmds)))))
(define
tcl-eval-string
(fn (interp src) (tcl-eval-script interp (tcl-parse src))))
(define
tcl-cmd-set
(fn
(interp args)
(if
(= (len args) 1)
(assoc interp :result (tcl-var-get interp (first args)))
(let
((val (nth args 1)))
(assoc (tcl-var-set interp (first args) val) :result val)))))
(define
tcl-cmd-puts
(fn
(interp args)
(let
((text (last args))
(no-nl
(and
(> (len args) 1)
(equal? (first args) "-nonewline"))))
(let
((line (if no-nl text (str text "\n"))))
(assoc interp :output (str (get interp :output) line))))))
(define
tcl-cmd-incr
(fn
(interp args)
(let
((name (first args))
(delta
(if
(> (len args) 1)
(parse-int (nth args 1))
1)))
(let
((new-val (str (+ (parse-int (tcl-var-get interp name)) delta))))
(assoc (tcl-var-set interp name new-val) :result new-val)))))
(define
tcl-cmd-append
(fn
(interp args)
(let
((name (first args)) (suffix (join "" (rest args))))
(let
((cur (let ((v (frame-lookup (get interp :frame) name))) (if (nil? v) "" v))))
(let
((new-val (str cur suffix)))
(assoc (tcl-var-set interp name new-val) :result new-val))))))
(define
tcl-true?
(fn
(s)
(not
(or (equal? s "0") (equal? s "") (equal? s "false") (equal? s "no")))))
(define tcl-false? (fn (s) (not (tcl-true? s))))
(define
tcl-expr-compute
(fn
(tokens)
(let
((n (len tokens)))
(cond
((= n 1) (first tokens))
((= n 2)
(let
((op (first tokens)) (x (nth tokens 1)))
(if
(equal? op "!")
(if (tcl-false? x) "1" "0")
(error (str "expr: unknown unary op: " op)))))
((= n 3)
(let
((l (first tokens)) (op (nth tokens 1)) (r (nth tokens 2)))
(cond
((equal? op "+") (str (+ (parse-int l) (parse-int r))))
((equal? op "-") (str (- (parse-int l) (parse-int r))))
((equal? op "*") (str (* (parse-int l) (parse-int r))))
((equal? op "/") (str (/ (parse-int l) (parse-int r))))
((equal? op "%") (str (mod (parse-int l) (parse-int r))))
((equal? op "==") (if (equal? l r) "1" "0"))
((equal? op "!=") (if (equal? l r) "0" "1"))
((equal? op "<")
(if (< (parse-int l) (parse-int r)) "1" "0"))
((equal? op ">")
(if (> (parse-int l) (parse-int r)) "1" "0"))
((equal? op "<=")
(if (<= (parse-int l) (parse-int r)) "1" "0"))
((equal? op ">=")
(if (>= (parse-int l) (parse-int r)) "1" "0"))
((equal? op "&&")
(if (and (tcl-true? l) (tcl-true? r)) "1" "0"))
((equal? op "||")
(if (or (tcl-true? l) (tcl-true? r)) "1" "0"))
(else (error (str "expr: unknown op: " op))))))
(else (error (str "expr: complex expr not yet supported")))))))
(define
tcl-expr-eval
(fn
(interp s)
(let
((cmds (tcl-parse s)))
(if
(= 0 (len cmds))
{:result "0" :interp interp}
(let
((wr (tcl-eval-words (get (first cmds) :words) interp)))
{:result (tcl-expr-compute (get wr :values)) :interp (get wr :interp)})))))
(define tcl-cmd-break (fn (interp args) (assoc interp :code 3)))
(define tcl-cmd-continue (fn (interp args) (assoc interp :code 4)))
(define
tcl-cmd-return
(fn
(interp args)
(let
((val (if (> (len args) 0) (last args) "")))
(assoc (assoc interp :result val) :code 2))))
(define
tcl-cmd-error
(fn
(interp args)
(let
((msg (if (> (len args) 0) (first args) "error")))
(assoc (assoc interp :result msg) :code 1))))
(define
tcl-cmd-unset
(fn
(interp args)
(reduce
(fn
(i name)
(let
((frame (get i :frame)))
(let
((new-locals (reduce (fn (acc k) (if (equal? k name) acc (assoc acc k (get (get frame :locals) k)))) {} (keys (get frame :locals)))))
(assoc i :frame (assoc frame :locals new-locals)))))
interp
args)))
(define
tcl-cmd-lappend
(fn
(interp args)
(let
((name (first args)) (items (rest args)))
(let
((cur (let ((v (frame-lookup (get interp :frame) name))) (if (nil? v) "" v))))
(let
((new-val (if (equal? cur "") (join " " items) (str cur " " (join " " items)))))
(assoc (tcl-var-set interp name new-val) :result new-val))))))
(define
tcl-cmd-eval
(fn (interp args) (tcl-eval-string interp (join " " args))))
(define
tcl-while-loop
(fn
(interp cond-str body)
(let
((er (tcl-expr-eval interp cond-str)))
(if
(tcl-false? (get er :result))
(get er :interp)
(let
((body-result (tcl-eval-string (get er :interp) body)))
(let
((code (get body-result :code)))
(cond
((= code 3) (assoc body-result :code 0))
((= code 2) body-result)
((= code 1) body-result)
(else
(tcl-while-loop
(assoc body-result :code 0)
cond-str
body)))))))))
(define
tcl-cmd-while
(fn
(interp args)
(tcl-while-loop interp (first args) (nth args 1))))
(define
tcl-cmd-if
(fn
(interp args)
(let
((er (tcl-expr-eval interp (first args))))
(let
((cond-true (tcl-true? (get er :result)))
(new-interp (get er :interp))
(rest-args (rest args)))
(let
((adj (if (and (> (len rest-args) 0) (equal? (first rest-args) "then")) (rest rest-args) rest-args)))
(let
((then-body (first adj)) (rest2 (rest adj)))
(if
cond-true
(tcl-eval-string new-interp then-body)
(cond
((= 0 (len rest2)) new-interp)
((equal? (first rest2) "else")
(if
(> (len rest2) 1)
(tcl-eval-string new-interp (nth rest2 1))
new-interp))
((equal? (first rest2) "elseif")
(tcl-cmd-if new-interp (rest rest2)))
(else new-interp)))))))))
(define
tcl-for-loop
(fn
(interp cond-str step body)
(let
((er (tcl-expr-eval interp cond-str)))
(if
(tcl-false? (get er :result))
(get er :interp)
(let
((body-result (tcl-eval-string (get er :interp) body)))
(let
((code (get body-result :code)))
(cond
((= code 3) (assoc body-result :code 0))
((= code 2) body-result)
((= code 1) body-result)
(else
(let
((step-result (tcl-eval-string (assoc body-result :code 0) step)))
(tcl-for-loop
(assoc step-result :code 0)
cond-str
step
body))))))))))
(define
tcl-cmd-for
(fn
(interp args)
(let
((init-body (first args))
(cond-str (nth args 1))
(step (nth args 2))
(body (nth args 3)))
(let
((init-result (tcl-eval-string interp init-body)))
(tcl-for-loop init-result cond-str step body)))))
(define
tcl-foreach-loop
(fn
(interp var-name items body)
(if
(= 0 (len items))
interp
(let
((body-result (tcl-eval-string (tcl-var-set interp var-name (first items)) body)))
(let
((code (get body-result :code)))
(cond
((= code 3) (assoc body-result :code 0))
((= code 2) body-result)
((= code 1) body-result)
(else
(tcl-foreach-loop
(assoc body-result :code 0)
var-name
(rest items)
body))))))))
(define
tcl-cmd-foreach
(fn
(interp args)
(let
((var-name (first args))
(list-str (nth args 1))
(body (nth args 2)))
(tcl-foreach-loop interp var-name (tcl-list-split list-str) body))))
(define
tcl-cmd-switch
(fn
(interp args)
(let
((str-val (first args)) (body (nth args 1)))
(let
((pairs (tcl-list-split body)))
(define
try-pairs
(fn
(ps)
(if
(= 0 (len ps))
interp
(let
((pat (first ps)) (bdy (nth ps 1)))
(if
(or (equal? pat str-val) (equal? pat "default"))
(if
(equal? bdy "-")
(try-pairs (rest (rest ps)))
(tcl-eval-string interp bdy))
(try-pairs (rest (rest ps))))))))
(try-pairs pairs)))))
(define
tcl-cmd-expr
(fn
(interp args)
(let
((s (join " " args)))
(let
((er (tcl-expr-eval interp s)))
(assoc (get er :interp) :result (get er :result))))))
(define tcl-cmd-gets (fn (interp args) (assoc interp :result "")))
(define
tcl-cmd-subst
(fn (interp args) (assoc interp :result (last args))))
(define
tcl-cmd-format
(fn (interp args) (assoc interp :result (join "" args))))
(define tcl-cmd-scan (fn (interp args) (assoc interp :result "0")))
(define
make-default-tcl-interp
(fn
()
(let
((i (make-tcl-interp)))
(let
((i (tcl-register i "set" tcl-cmd-set)))
(let
((i (tcl-register i "puts" tcl-cmd-puts)))
(let
((i (tcl-register i "incr" tcl-cmd-incr)))
(let
((i (tcl-register i "append" tcl-cmd-append)))
(let
((i (tcl-register i "unset" tcl-cmd-unset)))
(let
((i (tcl-register i "lappend" tcl-cmd-lappend)))
(let
((i (tcl-register i "eval" tcl-cmd-eval)))
(let
((i (tcl-register i "if" tcl-cmd-if)))
(let
((i (tcl-register i "while" tcl-cmd-while)))
(let
((i (tcl-register i "for" tcl-cmd-for)))
(let
((i (tcl-register i "foreach" tcl-cmd-foreach)))
(let
((i (tcl-register i "switch" tcl-cmd-switch)))
(let
((i (tcl-register i "break" tcl-cmd-break)))
(let
((i (tcl-register i "continue" tcl-cmd-continue)))
(let
((i (tcl-register i "return" tcl-cmd-return)))
(let
((i (tcl-register i "error" tcl-cmd-error)))
(let
((i (tcl-register i "expr" tcl-cmd-expr)))
(let
((i (tcl-register i "gets" tcl-cmd-gets)))
(let
((i (tcl-register i "subst" tcl-cmd-subst)))
(let
((i (tcl-register i "format" tcl-cmd-format)))
(tcl-register
i
"scan"
tcl-cmd-scan))))))))))))))))))))))))