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Parser parses optional deriving clause; only appended to AST when non-empty. hk-bind-decls! data arm generates dictShow_Con / dictEq_Con per constructor. hk-binop == and /= now deep-force both sides (SX dict equality is by reference — two thunks wrapping the same value compared as not-equal without this). Three token-type fixes in the deriving parser (lparen/rparen/comma, not "special"). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
1659 lines
59 KiB
Plaintext
1659 lines
59 KiB
Plaintext
;; Haskell 98 expression parser.
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;;
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;; Input: the post-layout token list from (hk-layout (hk-tokenize src)).
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;; Output: an AST. Nodes are plain lists tagged by a keyword head
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;; (keywords evaluate to their string name, so `(list :var "x")` is
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;; indistinguishable from `(list "var" "x")` at runtime — this lets
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;; tests literally write `(list :var "x")` on both sides).
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;;
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;; Scope (this iteration — expressions only):
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;; atoms int/float/string/char/var/con, parens, tuple, list, range
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;; application left-associative, f x y z
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;; prefix - unary negation on an lexp
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;; infix ops precedence-climbing, full Haskell 98 default table
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;; lambda \x y -> body
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;; if if c then t else e
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;; let let { x = e ; y = e } in body (uses layout braces)
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;;
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;; AST shapes:
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;; (:int N)
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;; (:float F)
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;; (:string S)
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;; (:char C)
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;; (:var NAME)
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;; (:con NAME)
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;; (:app FN ARG) — binary, chain for multi-arg
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;; (:op OP LHS RHS) — binary infix
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;; (:neg E)
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;; (:tuple ITEMS) — ITEMS is a list of AST nodes
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;; (:list ITEMS) — enumerated list
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;; (:range FROM TO) — [from..to]
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;; (:range-step FROM NEXT TO) — [from,next..to]
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;; (:if C T E)
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;; (:lambda PARAMS BODY) — PARAMS is list of varids
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;; (:let BINDS BODY) — BINDS is list of (:bind NAME EXPR)
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;; ── Operator precedence table (Haskell 98 defaults) ──────────────
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(define
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hk-op-prec-table
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(let
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((t (dict)))
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(dict-set! t "!!" {:prec 9 :assoc "left"})
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(dict-set! t "." {:prec 9 :assoc "right"})
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(dict-set! t "^" {:prec 8 :assoc "right"})
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(dict-set! t "^^" {:prec 8 :assoc "right"})
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(dict-set! t "**" {:prec 8 :assoc "right"})
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(dict-set! t "*" {:prec 7 :assoc "left"})
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(dict-set! t "/" {:prec 7 :assoc "left"})
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(dict-set! t "+" {:prec 6 :assoc "left"})
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(dict-set! t "-" {:prec 6 :assoc "left"})
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(dict-set! t ":" {:prec 5 :assoc "right"})
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(dict-set! t "++" {:prec 5 :assoc "right"})
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(dict-set! t "==" {:prec 4 :assoc "non"})
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(dict-set! t "/=" {:prec 4 :assoc "non"})
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(dict-set! t "<" {:prec 4 :assoc "non"})
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(dict-set! t "<=" {:prec 4 :assoc "non"})
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(dict-set! t ">" {:prec 4 :assoc "non"})
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(dict-set! t ">=" {:prec 4 :assoc "non"})
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(dict-set! t "&&" {:prec 3 :assoc "right"})
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(dict-set! t "||" {:prec 2 :assoc "right"})
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(dict-set! t ">>" {:prec 1 :assoc "left"})
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(dict-set! t ">>=" {:prec 1 :assoc "left"})
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(dict-set! t "=<<" {:prec 1 :assoc "right"})
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(dict-set! t "$" {:prec 0 :assoc "right"})
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(dict-set! t "$!" {:prec 0 :assoc "right"})
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t))
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(define
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hk-op-info
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(fn
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(op)
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(if
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(has-key? hk-op-prec-table op)
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(get hk-op-prec-table op)
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{:prec 9 :assoc "left"})))
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;; ── Atom-start predicate ─────────────────────────────────────────
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(define
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hk-atom-start?
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(fn
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(tok)
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(if
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(nil? tok)
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false
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(let
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((ty (get tok "type")))
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(or
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(= ty "integer")
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(= ty "float")
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(= ty "string")
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(= ty "char")
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(= ty "varid")
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(= ty "conid")
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(= ty "qvarid")
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(= ty "qconid")
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(= ty "lparen")
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(= ty "lbracket"))))))
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;; apat-start? — what can begin an atomic pattern
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(define
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hk-apat-start?
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(fn
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(tok)
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(if
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(nil? tok)
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false
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(let
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((ty (get tok "type")) (val (get tok "value")))
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(or
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(and (= ty "reserved") (= val "_"))
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(= ty "integer")
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(= ty "float")
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(= ty "string")
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(= ty "char")
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(= ty "varid")
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(= ty "conid")
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(= ty "qconid")
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(= ty "lparen")
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(= ty "lbracket")
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(and (= ty "varsym") (= val "-"))
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(and (= ty "reservedop") (= val "~")))))))
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;; ── Atype-start predicate (types) ───────────────────────────────
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(define
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hk-atype-start?
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(fn
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(tok)
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(if
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(nil? tok)
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false
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(let
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((ty (get tok "type")))
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(or
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(= ty "conid")
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(= ty "qconid")
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(= ty "varid")
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(= ty "lparen")
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(= ty "lbracket"))))))
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;; ── Main entry ───────────────────────────────────────────────────
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(define
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hk-parser
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(fn
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(tokens mode)
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(let
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((toks tokens) (pos 0) (n (len tokens)))
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(define hk-peek (fn () (if (< pos n) (nth toks pos) nil)))
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(define
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hk-peek-at
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(fn
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(offset)
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(if (< (+ pos offset) n) (nth toks (+ pos offset)) nil)))
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(define
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hk-advance!
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(fn () (let ((t (hk-peek))) (set! pos (+ pos 1)) t)))
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(define hk-next hk-advance!)
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(define
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hk-peek-type
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(fn
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()
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(let ((t (hk-peek))) (if (nil? t) "<eof>" (get t "type")))))
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(define
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hk-peek-value
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(fn () (let ((t (hk-peek))) (if (nil? t) nil (get t "value")))))
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(define
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hk-match?
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(fn
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(ty v)
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(let
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((t (hk-peek)))
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(and
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(not (nil? t))
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(= (get t "type") ty)
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(or (nil? v) (= (get t "value") v))))))
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(define
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hk-err
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(fn
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(msg)
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(raise
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(str
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"parse error: "
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msg
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" (at "
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(hk-peek-type)
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(if (nil? (hk-peek-value)) "" (str " " (hk-peek-value)))
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")"))))
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(define
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hk-expect!
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(fn
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(ty v)
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(if
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(hk-match? ty v)
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(hk-advance!)
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(hk-err (str "expected " ty (if (nil? v) "" (str " '" v "'")))))))
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(define
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hk-parse-aexp
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(fn
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()
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(let
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((t (hk-peek)))
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(cond
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((nil? t) (hk-err "unexpected end of input"))
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((= (get t "type") "integer")
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(do (hk-advance!) (list :int (get t "value"))))
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((= (get t "type") "float")
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(do (hk-advance!) (list :float (get t "value"))))
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((= (get t "type") "string")
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(do (hk-advance!) (list :string (get t "value"))))
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((= (get t "type") "char")
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(do (hk-advance!) (list :char (get t "value"))))
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((= (get t "type") "varid")
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(do (hk-advance!) (list :var (get t "value"))))
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((= (get t "type") "conid")
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(do (hk-advance!) (list :con (get t "value"))))
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((= (get t "type") "qvarid")
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(do (hk-advance!) (list :var (get t "value"))))
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((= (get t "type") "qconid")
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(do (hk-advance!) (list :con (get t "value"))))
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((= (get t "type") "lparen") (hk-parse-parens))
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((= (get t "type") "lbracket") (hk-parse-list-lit))
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(:else (hk-err "unexpected token in expression"))))))
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(define
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hk-section-op-info
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(fn
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()
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(let
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((t (hk-peek)))
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(cond
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((nil? t) nil)
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((= (get t "type") "varsym") {:len 1 :name (get t "value")})
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((= (get t "type") "consym") {:len 1 :name (get t "value")})
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((and (= (get t "type") "reservedop") (= (get t "value") ":"))
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{:len 1 :name ":"})
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((= (get t "type") "backtick")
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(let
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((varid-t (hk-peek-at 1)))
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(cond
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((and (not (nil? varid-t)) (= (get varid-t "type") "varid"))
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{:len 3 :name (get varid-t "value")})
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(:else nil))))
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(:else nil)))))
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(define
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hk-parse-parens
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(fn
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()
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(hk-expect! "lparen" nil)
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(cond
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((hk-match? "rparen" nil) (do (hk-advance!) (list :con "()")))
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(:else
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(let
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((op-info (hk-section-op-info)))
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(cond
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((and (not (nil? op-info)) (let ((after (hk-peek-at (get op-info "len")))) (or (and (not (nil? after)) (= (get after "type") "rparen")) (not (= (get op-info "name") "-")))))
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(let
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((op-name (get op-info "name"))
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(op-len (get op-info "len"))
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(after (hk-peek-at (get op-info "len"))))
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(hk-consume-op!)
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(cond
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((and (not (nil? after)) (= (get after "type") "rparen"))
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(do (hk-advance!) (list :var op-name)))
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(:else
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(let
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((expr-e (hk-parse-expr-inner)))
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(hk-expect! "rparen" nil)
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(list :sect-right op-name expr-e))))))
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(:else
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(let
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((first-e (hk-parse-expr-inner))
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(items (list))
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(is-tuple false))
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(append! items first-e)
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(define
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hk-tup-loop
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(fn
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()
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(when
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(hk-match? "comma" nil)
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(do
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(hk-advance!)
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(set! is-tuple true)
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(append! items (hk-parse-expr-inner))
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(hk-tup-loop)))))
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(hk-tup-loop)
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(cond
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((hk-match? "rparen" nil)
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(do
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(hk-advance!)
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(if is-tuple (list :tuple items) first-e)))
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(:else
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(let
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((op-info2 (hk-section-op-info)))
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(cond
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((and (not (nil? op-info2)) (not is-tuple) (let ((after2 (hk-peek-at (get op-info2 "len")))) (and (not (nil? after2)) (= (get after2 "type") "rparen"))))
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(let
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((op-name (get op-info2 "name")))
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(hk-consume-op!)
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(hk-advance!)
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(list :sect-left op-name first-e)))
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(:else (hk-err "expected ')' after expression"))))))))))))))
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(define
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hk-comp-qual-is-gen?
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(fn
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()
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(let
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((j pos) (depth 0) (found false) (done false))
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(define
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hk-qsc-loop
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(fn
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()
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(when
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(and (not done) (< j n))
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(let
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((t (nth toks j)) (ty (get t "type")))
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(cond
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((and (= depth 0) (or (= ty "comma") (= ty "rbracket")))
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(set! done true))
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((and (= depth 0) (= ty "reservedop") (= (get t "value") "<-"))
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(do (set! found true) (set! done true)))
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((or (= ty "lparen") (= ty "lbracket") (= ty "lbrace") (= ty "vlbrace"))
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(set! depth (+ depth 1)))
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((or (= ty "rparen") (= ty "rbrace") (= ty "vrbrace"))
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(set! depth (- depth 1)))
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(:else nil))
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(set! j (+ j 1))
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(hk-qsc-loop)))))
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(hk-qsc-loop)
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found)))
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(define
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hk-parse-comp-let
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(fn
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()
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(hk-expect! "reserved" "let")
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(let
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((explicit (hk-match? "lbrace" nil)))
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(if explicit (hk-advance!) (hk-expect! "vlbrace" nil))
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(let
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((binds (list)))
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(when
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(not
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(if
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explicit
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(hk-match? "rbrace" nil)
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(hk-match? "vrbrace" nil)))
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(do
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(append! binds (hk-parse-bind))
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(define
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hk-cl-loop
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(fn
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()
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(when
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(or (hk-match? "semi" nil) (hk-match? "vsemi" nil))
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(do
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(hk-advance!)
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(when
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(not
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(if
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explicit
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(hk-match? "rbrace" nil)
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(hk-match? "vrbrace" nil)))
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(append! binds (hk-parse-bind)))
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(hk-cl-loop)))))
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(hk-cl-loop)))
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(cond
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(explicit (hk-expect! "rbrace" nil))
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((hk-match? "vrbrace" nil) (hk-advance!))
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((or (hk-match? "rbracket" nil) (hk-match? "comma" nil))
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nil)
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(:else (hk-err "expected end of let block in comprehension")))
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(list :q-let binds)))))
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(define
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hk-parse-qual
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(fn
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()
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(cond
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((hk-match? "reserved" "let") (hk-parse-comp-let))
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((hk-comp-qual-is-gen?)
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(let
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((pat (hk-parse-pat)))
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(hk-expect! "reservedop" "<-")
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(list :q-gen pat (hk-parse-expr-inner))))
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(:else (list :q-guard (hk-parse-expr-inner))))))
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(define
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hk-parse-list-lit
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(fn
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()
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(hk-expect! "lbracket" nil)
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(cond
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((hk-match? "rbracket" nil)
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(do (hk-advance!) (list :list (list))))
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(:else
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(let
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((first-e (hk-parse-expr-inner)))
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(cond
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((hk-match? "reservedop" "..")
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(do
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(hk-advance!)
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(cond
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((hk-match? "rbracket" nil)
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(do (hk-advance!) (list :range-from first-e)))
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(:else
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(let
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((end-e (hk-parse-expr-inner)))
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(hk-expect! "rbracket" nil)
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(list :range first-e end-e))))))
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((hk-match? "reservedop" "|")
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(do
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(hk-advance!)
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(let
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((quals (list)))
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(append! quals (hk-parse-qual))
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(define
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hk-lc-loop
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(fn
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()
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(when
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(hk-match? "comma" nil)
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(do
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(hk-advance!)
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(append! quals (hk-parse-qual))
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(hk-lc-loop)))))
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(hk-lc-loop)
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(hk-expect! "rbracket" nil)
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(list :list-comp first-e quals))))
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((hk-match? "comma" nil)
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(do
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(hk-advance!)
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(let
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((second-e (hk-parse-expr-inner)))
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(cond
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((hk-match? "reservedop" "..")
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(do
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(hk-advance!)
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(let
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((end-e (hk-parse-expr-inner)))
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(hk-expect! "rbracket" nil)
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(list :range-step first-e second-e end-e))))
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(:else
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(let
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((items (list)))
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(append! items first-e)
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(append! items second-e)
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(define
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hk-list-loop
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(fn
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()
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(when
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(hk-match? "comma" nil)
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(do
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(hk-advance!)
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(append! items (hk-parse-expr-inner))
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(hk-list-loop)))))
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(hk-list-loop)
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(hk-expect! "rbracket" nil)
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(list :list items)))))))
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(:else
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(do
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(hk-expect! "rbracket" nil)
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(list :list (list first-e))))))))))
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(define
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hk-parse-fexp
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(fn
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()
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(let
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((fn-e (hk-parse-aexp)))
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(define
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hk-app-loop
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(fn
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()
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(when
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(hk-atom-start? (hk-peek))
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(let
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((arg (hk-parse-aexp)))
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(set! fn-e (list :app fn-e arg))
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(hk-app-loop)))))
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(hk-app-loop)
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fn-e)))
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(define
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hk-parse-lambda
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(fn
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()
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(hk-expect! "reservedop" "\\")
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(let
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((params (list)))
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(when
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(not (hk-apat-start? (hk-peek)))
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(hk-err "lambda needs at least one pattern parameter"))
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(define
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hk-lam-loop
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(fn
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()
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(when
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(hk-apat-start? (hk-peek))
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(do (append! params (hk-parse-apat)) (hk-lam-loop)))))
|
|
(hk-lam-loop)
|
|
(hk-expect! "reservedop" "->")
|
|
(list :lambda params (hk-parse-expr-inner)))))
|
|
(define
|
|
hk-parse-if
|
|
(fn
|
|
()
|
|
(hk-expect! "reserved" "if")
|
|
(let
|
|
((c (hk-parse-expr-inner)))
|
|
(hk-expect! "reserved" "then")
|
|
(let
|
|
((th (hk-parse-expr-inner)))
|
|
(hk-expect! "reserved" "else")
|
|
(let ((el (hk-parse-expr-inner))) (list :if c th el))))))
|
|
(define
|
|
hk-parse-let
|
|
(fn
|
|
()
|
|
(hk-expect! "reserved" "let")
|
|
(let
|
|
((explicit (hk-match? "lbrace" nil)))
|
|
(if explicit (hk-advance!) (hk-expect! "vlbrace" nil))
|
|
(let
|
|
((binds (list)))
|
|
(when
|
|
(not
|
|
(if
|
|
explicit
|
|
(hk-match? "rbrace" nil)
|
|
(hk-match? "vrbrace" nil)))
|
|
(do
|
|
(append! binds (hk-parse-bind))
|
|
(define
|
|
hk-let-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(or (hk-match? "semi" nil) (hk-match? "vsemi" nil))
|
|
(do
|
|
(hk-advance!)
|
|
(when
|
|
(not
|
|
(if
|
|
explicit
|
|
(hk-match? "rbrace" nil)
|
|
(hk-match? "vrbrace" nil)))
|
|
(append! binds (hk-parse-bind)))
|
|
(hk-let-loop)))))
|
|
(hk-let-loop)))
|
|
(if
|
|
explicit
|
|
(hk-expect! "rbrace" nil)
|
|
(hk-expect! "vrbrace" nil))
|
|
(hk-expect! "reserved" "in")
|
|
(list :let binds (hk-parse-expr-inner))))))
|
|
(define
|
|
hk-parse-where-decls
|
|
(fn
|
|
()
|
|
(let
|
|
((explicit (hk-match? "lbrace" nil)))
|
|
(if explicit (hk-advance!) (hk-expect! "vlbrace" nil))
|
|
(let
|
|
((decls (list)))
|
|
(when
|
|
(not
|
|
(if
|
|
explicit
|
|
(hk-match? "rbrace" nil)
|
|
(hk-match? "vrbrace" nil)))
|
|
(do
|
|
(append! decls (hk-parse-decl))
|
|
(define
|
|
hk-wd-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(or (hk-match? "vsemi" nil) (hk-match? "semi" nil))
|
|
(do
|
|
(hk-advance!)
|
|
(when
|
|
(not
|
|
(if
|
|
explicit
|
|
(hk-match? "rbrace" nil)
|
|
(hk-match? "vrbrace" nil)))
|
|
(append! decls (hk-parse-decl)))
|
|
(hk-wd-loop)))))
|
|
(hk-wd-loop)))
|
|
(if
|
|
explicit
|
|
(hk-expect! "rbrace" nil)
|
|
(hk-expect! "vrbrace" nil))
|
|
decls))))
|
|
(define
|
|
hk-parse-guarded
|
|
(fn
|
|
(sep)
|
|
(let
|
|
((guards (list)))
|
|
(define
|
|
hk-g-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(hk-match? "reservedop" "|")
|
|
(do
|
|
(hk-advance!)
|
|
(let
|
|
((cond-e (hk-parse-expr-inner)))
|
|
(hk-expect! "reservedop" sep)
|
|
(let
|
|
((expr-e (hk-parse-expr-inner)))
|
|
(append! guards (list :guard cond-e expr-e))
|
|
(hk-g-loop)))))))
|
|
(hk-g-loop)
|
|
(list :guarded guards))))
|
|
(define
|
|
hk-parse-rhs
|
|
(fn
|
|
(sep)
|
|
(let
|
|
((body (cond ((hk-match? "reservedop" "|") (hk-parse-guarded sep)) (:else (do (hk-expect! "reservedop" sep) (hk-parse-expr-inner))))))
|
|
(cond
|
|
((hk-match? "reserved" "where")
|
|
(do (hk-advance!) (list :where body (hk-parse-where-decls))))
|
|
(:else body)))))
|
|
(define
|
|
hk-parse-bind
|
|
(fn
|
|
()
|
|
(let
|
|
((t (hk-peek)))
|
|
(cond
|
|
((and (not (nil? t)) (= (get t "type") "varid"))
|
|
(let
|
|
((name (get (hk-advance!) "value")) (pats (list)))
|
|
(define
|
|
hk-b-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(hk-apat-start? (hk-peek))
|
|
(do (append! pats (hk-parse-apat)) (hk-b-loop)))))
|
|
(hk-b-loop)
|
|
(if
|
|
(= (len pats) 0)
|
|
(list :bind (list :p-var name) (hk-parse-rhs "="))
|
|
(list :fun-clause name pats (hk-parse-rhs "=")))))
|
|
(:else
|
|
(let
|
|
((pat (hk-parse-pat)))
|
|
(list :bind pat (hk-parse-rhs "="))))))))
|
|
(define
|
|
hk-parse-apat
|
|
(fn
|
|
()
|
|
(let
|
|
((t (hk-peek)))
|
|
(cond
|
|
((nil? t) (hk-err "unexpected end of input in pattern"))
|
|
((and (= (get t "type") "reserved") (= (get t "value") "_"))
|
|
(do (hk-advance!) (list :p-wild)))
|
|
((and (= (get t "type") "reservedop") (= (get t "value") "~"))
|
|
(do (hk-advance!) (list :p-lazy (hk-parse-apat))))
|
|
((and (= (get t "type") "varsym") (= (get t "value") "-"))
|
|
(do
|
|
(hk-advance!)
|
|
(let
|
|
((n (hk-peek)))
|
|
(cond
|
|
((nil? n)
|
|
(hk-err "expected numeric literal after '-'"))
|
|
((= (get n "type") "integer")
|
|
(do
|
|
(hk-advance!)
|
|
(list :p-int (- 0 (get n "value")))))
|
|
((= (get n "type") "float")
|
|
(do
|
|
(hk-advance!)
|
|
(list :p-float (- 0 (get n "value")))))
|
|
(:else
|
|
(hk-err
|
|
"only numeric literals may follow '-' in a pattern"))))))
|
|
((= (get t "type") "integer")
|
|
(do (hk-advance!) (list :p-int (get t "value"))))
|
|
((= (get t "type") "float")
|
|
(do (hk-advance!) (list :p-float (get t "value"))))
|
|
((= (get t "type") "string")
|
|
(do (hk-advance!) (list :p-string (get t "value"))))
|
|
((= (get t "type") "char")
|
|
(do (hk-advance!) (list :p-char (get t "value"))))
|
|
((= (get t "type") "varid")
|
|
(let
|
|
((next-t (hk-peek-at 1)))
|
|
(cond
|
|
((and (not (nil? next-t)) (= (get next-t "type") "reservedop") (= (get next-t "value") "@"))
|
|
(do
|
|
(hk-advance!)
|
|
(hk-advance!)
|
|
(list :p-as (get t "value") (hk-parse-apat))))
|
|
(:else
|
|
(do (hk-advance!) (list :p-var (get t "value")))))))
|
|
((= (get t "type") "conid")
|
|
(do (hk-advance!) (list :p-con (get t "value") (list))))
|
|
((= (get t "type") "qconid")
|
|
(do (hk-advance!) (list :p-con (get t "value") (list))))
|
|
((= (get t "type") "lparen") (hk-parse-paren-pat))
|
|
((= (get t "type") "lbracket") (hk-parse-list-pat))
|
|
(:else (hk-err "unexpected token in pattern"))))))
|
|
(define
|
|
hk-parse-paren-pat
|
|
(fn
|
|
()
|
|
(hk-expect! "lparen" nil)
|
|
(cond
|
|
((hk-match? "rparen" nil)
|
|
(do (hk-advance!) (list :p-con "()" (list))))
|
|
(:else
|
|
(let
|
|
((first-p (hk-parse-pat)) (items (list)) (is-tup false))
|
|
(append! items first-p)
|
|
(define
|
|
hk-ppt-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(hk-match? "comma" nil)
|
|
(do
|
|
(hk-advance!)
|
|
(set! is-tup true)
|
|
(append! items (hk-parse-pat))
|
|
(hk-ppt-loop)))))
|
|
(hk-ppt-loop)
|
|
(hk-expect! "rparen" nil)
|
|
(if is-tup (list :p-tuple items) first-p))))))
|
|
(define
|
|
hk-parse-list-pat
|
|
(fn
|
|
()
|
|
(hk-expect! "lbracket" nil)
|
|
(cond
|
|
((hk-match? "rbracket" nil)
|
|
(do (hk-advance!) (list :p-list (list))))
|
|
(:else
|
|
(let
|
|
((items (list)))
|
|
(append! items (hk-parse-pat))
|
|
(define
|
|
hk-plt-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(hk-match? "comma" nil)
|
|
(do
|
|
(hk-advance!)
|
|
(append! items (hk-parse-pat))
|
|
(hk-plt-loop)))))
|
|
(hk-plt-loop)
|
|
(hk-expect! "rbracket" nil)
|
|
(list :p-list items))))))
|
|
(define
|
|
hk-parse-pat-lhs
|
|
(fn
|
|
()
|
|
(let
|
|
((t (hk-peek)))
|
|
(cond
|
|
((and (not (nil? t)) (or (= (get t "type") "conid") (= (get t "type") "qconid")))
|
|
(let
|
|
((name (get (hk-advance!) "value")) (args (list)))
|
|
(define
|
|
hk-pca-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(hk-apat-start? (hk-peek))
|
|
(do (append! args (hk-parse-apat)) (hk-pca-loop)))))
|
|
(hk-pca-loop)
|
|
(list :p-con name args)))
|
|
(:else (hk-parse-apat))))))
|
|
(define
|
|
hk-parse-pat
|
|
(fn
|
|
()
|
|
(let
|
|
((left (hk-parse-pat-lhs)))
|
|
(cond
|
|
((or (= (hk-peek-type) "consym") (and (= (hk-peek-type) "reservedop") (= (hk-peek-value) ":")))
|
|
(let
|
|
((op (get (hk-advance!) "value")))
|
|
(let
|
|
((right (hk-parse-pat)))
|
|
(list :p-con op (list left right)))))
|
|
(:else left)))))
|
|
(define
|
|
hk-parse-alt
|
|
(fn
|
|
()
|
|
(let ((pat (hk-parse-pat))) (list :alt pat (hk-parse-rhs "->")))))
|
|
(define
|
|
hk-parse-case
|
|
(fn
|
|
()
|
|
(hk-expect! "reserved" "case")
|
|
(let
|
|
((scrut (hk-parse-expr-inner)))
|
|
(hk-expect! "reserved" "of")
|
|
(let
|
|
((explicit (hk-match? "lbrace" nil)))
|
|
(if explicit (hk-advance!) (hk-expect! "vlbrace" nil))
|
|
(let
|
|
((alts (list)))
|
|
(when
|
|
(not
|
|
(if
|
|
explicit
|
|
(hk-match? "rbrace" nil)
|
|
(hk-match? "vrbrace" nil)))
|
|
(do
|
|
(append! alts (hk-parse-alt))
|
|
(define
|
|
hk-case-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(or (hk-match? "semi" nil) (hk-match? "vsemi" nil))
|
|
(do
|
|
(hk-advance!)
|
|
(when
|
|
(not
|
|
(if
|
|
explicit
|
|
(hk-match? "rbrace" nil)
|
|
(hk-match? "vrbrace" nil)))
|
|
(append! alts (hk-parse-alt)))
|
|
(hk-case-loop)))))
|
|
(hk-case-loop)))
|
|
(if
|
|
explicit
|
|
(hk-expect! "rbrace" nil)
|
|
(hk-expect! "vrbrace" nil))
|
|
(list :case scrut alts))))))
|
|
(define
|
|
hk-do-stmt-is-bind?
|
|
(fn
|
|
()
|
|
(let
|
|
((j pos) (depth 0) (found false) (done false))
|
|
(define
|
|
hk-scan-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(and (not done) (< j n))
|
|
(let
|
|
((t (nth toks j)) (ty nil))
|
|
(set! ty (get t "type"))
|
|
(cond
|
|
((and (= depth 0) (or (= ty "semi") (= ty "vsemi") (= ty "rbrace") (= ty "vrbrace")))
|
|
(set! done true))
|
|
((and (= depth 0) (= ty "reservedop") (= (get t "value") "<-"))
|
|
(do (set! found true) (set! done true)))
|
|
((or (= ty "lparen") (= ty "lbracket") (= ty "lbrace") (= ty "vlbrace"))
|
|
(set! depth (+ depth 1)))
|
|
((or (= ty "rparen") (= ty "rbracket"))
|
|
(set! depth (- depth 1)))
|
|
(:else nil))
|
|
(set! j (+ j 1))
|
|
(hk-scan-loop)))))
|
|
(hk-scan-loop)
|
|
found)))
|
|
(define
|
|
hk-parse-do-let
|
|
(fn
|
|
()
|
|
(hk-expect! "reserved" "let")
|
|
(let
|
|
((explicit (hk-match? "lbrace" nil)))
|
|
(if explicit (hk-advance!) (hk-expect! "vlbrace" nil))
|
|
(let
|
|
((binds (list)))
|
|
(when
|
|
(not
|
|
(if
|
|
explicit
|
|
(hk-match? "rbrace" nil)
|
|
(hk-match? "vrbrace" nil)))
|
|
(do
|
|
(append! binds (hk-parse-bind))
|
|
(define
|
|
hk-dlet-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(or (hk-match? "semi" nil) (hk-match? "vsemi" nil))
|
|
(do
|
|
(hk-advance!)
|
|
(when
|
|
(not
|
|
(if
|
|
explicit
|
|
(hk-match? "rbrace" nil)
|
|
(hk-match? "vrbrace" nil)))
|
|
(append! binds (hk-parse-bind)))
|
|
(hk-dlet-loop)))))
|
|
(hk-dlet-loop)))
|
|
(if
|
|
explicit
|
|
(hk-expect! "rbrace" nil)
|
|
(hk-expect! "vrbrace" nil))
|
|
(list :do-let binds)))))
|
|
(define
|
|
hk-parse-do-stmt
|
|
(fn
|
|
()
|
|
(cond
|
|
((hk-match? "reserved" "let") (hk-parse-do-let))
|
|
((hk-do-stmt-is-bind?)
|
|
(let
|
|
((pat (hk-parse-pat)))
|
|
(hk-expect! "reservedop" "<-")
|
|
(list :do-bind pat (hk-parse-expr-inner))))
|
|
(:else (list :do-expr (hk-parse-expr-inner))))))
|
|
(define
|
|
hk-parse-do
|
|
(fn
|
|
()
|
|
(hk-expect! "reserved" "do")
|
|
(let
|
|
((explicit (hk-match? "lbrace" nil)))
|
|
(if explicit (hk-advance!) (hk-expect! "vlbrace" nil))
|
|
(let
|
|
((stmts (list)))
|
|
(when
|
|
(not
|
|
(if
|
|
explicit
|
|
(hk-match? "rbrace" nil)
|
|
(hk-match? "vrbrace" nil)))
|
|
(do
|
|
(append! stmts (hk-parse-do-stmt))
|
|
(define
|
|
hk-do-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(or (hk-match? "semi" nil) (hk-match? "vsemi" nil))
|
|
(do
|
|
(hk-advance!)
|
|
(when
|
|
(not
|
|
(if
|
|
explicit
|
|
(hk-match? "rbrace" nil)
|
|
(hk-match? "vrbrace" nil)))
|
|
(append! stmts (hk-parse-do-stmt)))
|
|
(hk-do-loop)))))
|
|
(hk-do-loop)))
|
|
(if
|
|
explicit
|
|
(hk-expect! "rbrace" nil)
|
|
(hk-expect! "vrbrace" nil))
|
|
(list :do stmts)))))
|
|
(define
|
|
hk-parse-lexp
|
|
(fn
|
|
()
|
|
(cond
|
|
((hk-match? "reservedop" "\\") (hk-parse-lambda))
|
|
((hk-match? "reserved" "if") (hk-parse-if))
|
|
((hk-match? "reserved" "let") (hk-parse-let))
|
|
((hk-match? "reserved" "case") (hk-parse-case))
|
|
((hk-match? "reserved" "do") (hk-parse-do))
|
|
(:else (hk-parse-fexp)))))
|
|
(define
|
|
hk-parse-prefix
|
|
(fn
|
|
()
|
|
(cond
|
|
((and (hk-match? "varsym" "-"))
|
|
(do (hk-advance!) (list :neg (hk-parse-lexp))))
|
|
(:else (hk-parse-lexp)))))
|
|
(define
|
|
hk-is-infix-op?
|
|
(fn
|
|
(tok)
|
|
(if
|
|
(nil? tok)
|
|
false
|
|
(or
|
|
(= (get tok "type") "varsym")
|
|
(= (get tok "type") "consym")
|
|
(and
|
|
(= (get tok "type") "reservedop")
|
|
(= (get tok "value") ":"))
|
|
(= (get tok "type") "backtick")))))
|
|
(define
|
|
hk-consume-op!
|
|
(fn
|
|
()
|
|
(let
|
|
((t (hk-peek)))
|
|
(cond
|
|
((= (get t "type") "backtick")
|
|
(do
|
|
(hk-advance!)
|
|
(let
|
|
((v (hk-expect! "varid" nil)))
|
|
(hk-expect! "backtick" nil)
|
|
(get v "value"))))
|
|
(:else (do (hk-advance!) (get t "value")))))))
|
|
(define
|
|
hk-parse-infix
|
|
(fn
|
|
(min-prec)
|
|
(let
|
|
((left (hk-parse-prefix)))
|
|
(define
|
|
hk-inf-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(hk-is-infix-op? (hk-peek))
|
|
(let
|
|
((op-tok (hk-peek)))
|
|
(let
|
|
((op-len (if (= (get op-tok "type") "backtick") 3 1))
|
|
(op-name
|
|
(if
|
|
(= (get op-tok "type") "backtick")
|
|
(get (hk-peek-at 1) "value")
|
|
(get op-tok "value"))))
|
|
(let
|
|
((after-op (hk-peek-at op-len))
|
|
(info (hk-op-info op-name)))
|
|
(cond
|
|
((and (not (nil? after-op)) (= (get after-op "type") "rparen"))
|
|
nil)
|
|
((>= (get info "prec") min-prec)
|
|
(do
|
|
(hk-consume-op!)
|
|
(let
|
|
((next-min (cond ((= (get info "assoc") "left") (+ (get info "prec") 1)) ((= (get info "assoc") "right") (get info "prec")) (:else (+ (get info "prec") 1)))))
|
|
(let
|
|
((right (hk-parse-infix next-min)))
|
|
(set! left (list :op op-name left right))
|
|
(hk-inf-loop)))))
|
|
(:else nil))))))))
|
|
(hk-inf-loop)
|
|
left)))
|
|
(define hk-parse-expr-inner (fn () (hk-parse-infix 0)))
|
|
(define
|
|
hk-parse-paren-type
|
|
(fn
|
|
()
|
|
(hk-expect! "lparen" nil)
|
|
(cond
|
|
((hk-match? "rparen" nil)
|
|
(do (hk-advance!) (list :t-con "()")))
|
|
(:else
|
|
(let
|
|
((first-t (hk-parse-type)) (items (list)) (is-tup false))
|
|
(append! items first-t)
|
|
(define
|
|
hk-pt-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(hk-match? "comma" nil)
|
|
(do
|
|
(hk-advance!)
|
|
(set! is-tup true)
|
|
(append! items (hk-parse-type))
|
|
(hk-pt-loop)))))
|
|
(hk-pt-loop)
|
|
(hk-expect! "rparen" nil)
|
|
(if is-tup (list :t-tuple items) first-t))))))
|
|
(define
|
|
hk-parse-list-type
|
|
(fn
|
|
()
|
|
(hk-expect! "lbracket" nil)
|
|
(cond
|
|
((hk-match? "rbracket" nil)
|
|
(do (hk-advance!) (list :t-con "[]")))
|
|
(:else
|
|
(let
|
|
((inner (hk-parse-type)))
|
|
(hk-expect! "rbracket" nil)
|
|
(list :t-list inner))))))
|
|
(define
|
|
hk-parse-atype
|
|
(fn
|
|
()
|
|
(let
|
|
((t (hk-peek)))
|
|
(cond
|
|
((nil? t) (hk-err "unexpected end of input in type"))
|
|
((= (get t "type") "conid")
|
|
(do (hk-advance!) (list :t-con (get t "value"))))
|
|
((= (get t "type") "qconid")
|
|
(do (hk-advance!) (list :t-con (get t "value"))))
|
|
((= (get t "type") "varid")
|
|
(do (hk-advance!) (list :t-var (get t "value"))))
|
|
((= (get t "type") "lparen") (hk-parse-paren-type))
|
|
((= (get t "type") "lbracket") (hk-parse-list-type))
|
|
(:else (hk-err "unexpected token in type"))))))
|
|
(define
|
|
hk-parse-btype
|
|
(fn
|
|
()
|
|
(let
|
|
((head (hk-parse-atype)))
|
|
(define
|
|
hk-bt-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(hk-atype-start? (hk-peek))
|
|
(do
|
|
(set! head (list :t-app head (hk-parse-atype)))
|
|
(hk-bt-loop)))))
|
|
(hk-bt-loop)
|
|
head)))
|
|
(define
|
|
hk-parse-type
|
|
(fn
|
|
()
|
|
(let
|
|
((left (hk-parse-btype)))
|
|
(cond
|
|
((hk-match? "reservedop" "->")
|
|
(do (hk-advance!) (list :t-fun left (hk-parse-type))))
|
|
(:else left)))))
|
|
(define
|
|
hk-has-top-dcolon?
|
|
(fn
|
|
()
|
|
(let
|
|
((j pos) (depth 0) (found false) (done false))
|
|
(define
|
|
hk-dcol-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(and (not done) (< j n))
|
|
(let
|
|
((t (nth toks j)) (ty (get t "type")))
|
|
(cond
|
|
((and (= depth 0) (or (= ty "vsemi") (= ty "semi") (= ty "rbrace") (= ty "vrbrace")))
|
|
(set! done true))
|
|
((and (= depth 0) (= ty "reservedop") (= (get t "value") "::"))
|
|
(do (set! found true) (set! done true)))
|
|
((or (= ty "lparen") (= ty "lbracket") (= ty "lbrace") (= ty "vlbrace"))
|
|
(set! depth (+ depth 1)))
|
|
((or (= ty "rparen") (= ty "rbracket"))
|
|
(set! depth (- depth 1)))
|
|
(:else nil))
|
|
(set! j (+ j 1))
|
|
(hk-dcol-loop)))))
|
|
(hk-dcol-loop)
|
|
found)))
|
|
(define
|
|
hk-parse-type-sig
|
|
(fn
|
|
()
|
|
(let
|
|
((names (list)))
|
|
(when
|
|
(not (hk-match? "varid" nil))
|
|
(hk-err "type signature must start with a variable"))
|
|
(append! names (get (hk-advance!) "value"))
|
|
(define
|
|
hk-sig-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(hk-match? "comma" nil)
|
|
(do
|
|
(hk-advance!)
|
|
(when
|
|
(not (hk-match? "varid" nil))
|
|
(hk-err "expected name after ','"))
|
|
(append! names (get (hk-advance!) "value"))
|
|
(hk-sig-loop)))))
|
|
(hk-sig-loop)
|
|
(hk-expect! "reservedop" "::")
|
|
(list :type-sig names (hk-parse-type)))))
|
|
(define
|
|
hk-parse-fun-clause
|
|
(fn
|
|
()
|
|
(let
|
|
((t (hk-peek)))
|
|
(cond
|
|
((and (not (nil? t)) (= (get t "type") "varid"))
|
|
(let
|
|
((name (get (hk-advance!) "value")) (pats (list)))
|
|
(define
|
|
hk-fc-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(hk-apat-start? (hk-peek))
|
|
(do (append! pats (hk-parse-apat)) (hk-fc-loop)))))
|
|
(hk-fc-loop)
|
|
(list :fun-clause name pats (hk-parse-rhs "="))))
|
|
(:else
|
|
(let
|
|
((pat (hk-parse-pat)))
|
|
(list :pat-bind pat (hk-parse-rhs "="))))))))
|
|
(define
|
|
hk-parse-con-def
|
|
(fn
|
|
()
|
|
(when
|
|
(not (hk-match? "conid" nil))
|
|
(hk-err "expected constructor name"))
|
|
(let
|
|
((name (get (hk-advance!) "value")) (fields (list)))
|
|
(define
|
|
hk-cd-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(hk-atype-start? (hk-peek))
|
|
(do (append! fields (hk-parse-atype)) (hk-cd-loop)))))
|
|
(hk-cd-loop)
|
|
(list :con-def name fields))))
|
|
(define
|
|
hk-parse-tvars
|
|
(fn
|
|
()
|
|
(let
|
|
((vs (list)))
|
|
(define
|
|
hk-tv-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(hk-match? "varid" nil)
|
|
(do
|
|
(append! vs (get (hk-advance!) "value"))
|
|
(hk-tv-loop)))))
|
|
(hk-tv-loop)
|
|
vs)))
|
|
(define
|
|
hk-parse-data
|
|
(fn
|
|
()
|
|
(hk-expect! "reserved" "data")
|
|
(when
|
|
(not (hk-match? "conid" nil))
|
|
(hk-err "data declaration needs a type name"))
|
|
(let
|
|
((name (get (hk-advance!) "value"))
|
|
(tvars (hk-parse-tvars))
|
|
(cons-list (list))
|
|
(deriving-list (list)))
|
|
(when
|
|
(hk-match? "reservedop" "=")
|
|
(do
|
|
(hk-advance!)
|
|
(append! cons-list (hk-parse-con-def))
|
|
(define
|
|
hk-dc-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(hk-match? "reservedop" "|")
|
|
(do
|
|
(hk-advance!)
|
|
(append! cons-list (hk-parse-con-def))
|
|
(hk-dc-loop)))))
|
|
(hk-dc-loop)))
|
|
(when
|
|
(hk-match? "reserved" "deriving")
|
|
(do
|
|
(hk-advance!)
|
|
(cond
|
|
((hk-match? "lparen" nil)
|
|
(do
|
|
(hk-advance!)
|
|
(define
|
|
hk-der-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(hk-match? "conid" nil)
|
|
(do
|
|
(append!
|
|
deriving-list
|
|
(get (hk-advance!) "value"))
|
|
(when (hk-match? "comma" nil) (hk-advance!))
|
|
(hk-der-loop)))))
|
|
(hk-der-loop)
|
|
(hk-expect! "rparen" nil)))
|
|
((hk-match? "conid" nil)
|
|
(append! deriving-list (get (hk-advance!) "value"))))))
|
|
(if
|
|
(empty? deriving-list)
|
|
(list :data name tvars cons-list)
|
|
(list :data name tvars cons-list deriving-list)))))
|
|
(define
|
|
hk-parse-class
|
|
(fn
|
|
()
|
|
(hk-next)
|
|
(let
|
|
((cls (get (hk-next) "value")))
|
|
(let
|
|
((tvar (get (hk-next) "value")))
|
|
(hk-expect! "reserved" "where")
|
|
(list "class-decl" cls tvar (hk-parse-where-decls))))))
|
|
(define
|
|
hk-parse-instance
|
|
(fn
|
|
()
|
|
(hk-next)
|
|
(let
|
|
((cls (get (hk-next) "value")))
|
|
(let
|
|
((inst-type (hk-parse-atype)))
|
|
(hk-expect! "reserved" "where")
|
|
(list "instance-decl" cls inst-type (hk-parse-where-decls))))))
|
|
(define
|
|
hk-parse-type-syn
|
|
(fn
|
|
()
|
|
(hk-expect! "reserved" "type")
|
|
(when
|
|
(not (hk-match? "conid" nil))
|
|
(hk-err "type synonym needs a name"))
|
|
(let
|
|
((name (get (hk-advance!) "value")) (tvars (hk-parse-tvars)))
|
|
(hk-expect! "reservedop" "=")
|
|
(list :type-syn name tvars (hk-parse-type)))))
|
|
(define
|
|
hk-parse-newtype
|
|
(fn
|
|
()
|
|
(hk-expect! "reserved" "newtype")
|
|
(when
|
|
(not (hk-match? "conid" nil))
|
|
(hk-err "newtype needs a type name"))
|
|
(let
|
|
((name (get (hk-advance!) "value")) (tvars (hk-parse-tvars)))
|
|
(hk-expect! "reservedop" "=")
|
|
(when
|
|
(not (hk-match? "conid" nil))
|
|
(hk-err "newtype needs a constructor name"))
|
|
(let
|
|
((cname (get (hk-advance!) "value")))
|
|
(when
|
|
(not (hk-atype-start? (hk-peek)))
|
|
(hk-err "newtype constructor needs one field"))
|
|
(list :newtype name tvars cname (hk-parse-atype))))))
|
|
(define
|
|
hk-parse-op
|
|
(fn
|
|
()
|
|
(cond
|
|
((hk-match? "varsym" nil) (get (hk-advance!) "value"))
|
|
((hk-match? "consym" nil) (get (hk-advance!) "value"))
|
|
((and (hk-match? "reservedop" nil) (= (hk-peek-value) ":"))
|
|
(do (hk-advance!) ":"))
|
|
((hk-match? "backtick" nil)
|
|
(do
|
|
(hk-advance!)
|
|
(let
|
|
((v (hk-expect! "varid" nil)))
|
|
(hk-expect! "backtick" nil)
|
|
(get v "value"))))
|
|
(:else (hk-err "expected operator name in fixity decl")))))
|
|
(define
|
|
hk-parse-fixity
|
|
(fn
|
|
()
|
|
(let
|
|
((assoc "n"))
|
|
(cond
|
|
((hk-match? "reserved" "infixl") (set! assoc "l"))
|
|
((hk-match? "reserved" "infixr") (set! assoc "r"))
|
|
((hk-match? "reserved" "infix") (set! assoc "n"))
|
|
(:else (hk-err "expected fixity keyword")))
|
|
(hk-advance!)
|
|
(let
|
|
((prec 9))
|
|
(when
|
|
(hk-match? "integer" nil)
|
|
(set! prec (get (hk-advance!) "value")))
|
|
(let
|
|
((ops (list)))
|
|
(append! ops (hk-parse-op))
|
|
(define
|
|
hk-fx-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(hk-match? "comma" nil)
|
|
(do
|
|
(hk-advance!)
|
|
(append! ops (hk-parse-op))
|
|
(hk-fx-loop)))))
|
|
(hk-fx-loop)
|
|
(list :fixity assoc prec ops))))))
|
|
(define
|
|
hk-parse-decl
|
|
(fn
|
|
()
|
|
(cond
|
|
((hk-match? "reserved" "data") (hk-parse-data))
|
|
((hk-match? "reserved" "type") (hk-parse-type-syn))
|
|
((hk-match? "reserved" "newtype") (hk-parse-newtype))
|
|
((or (hk-match? "reserved" "infix") (hk-match? "reserved" "infixl") (hk-match? "reserved" "infixr"))
|
|
(hk-parse-fixity))
|
|
((hk-match? "reserved" "class") (hk-parse-class))
|
|
((hk-match? "reserved" "instance") (hk-parse-instance))
|
|
((hk-has-top-dcolon?) (hk-parse-type-sig))
|
|
(:else (hk-parse-fun-clause)))))
|
|
(define
|
|
hk-parse-ent-member
|
|
(fn
|
|
()
|
|
(cond
|
|
((hk-match? "varid" nil) (get (hk-advance!) "value"))
|
|
((hk-match? "conid" nil) (get (hk-advance!) "value"))
|
|
((hk-match? "lparen" nil)
|
|
(do
|
|
(hk-advance!)
|
|
(let
|
|
((op-name (cond ((hk-match? "varsym" nil) (get (hk-advance!) "value")) ((hk-match? "consym" nil) (get (hk-advance!) "value")) ((and (hk-match? "reservedop" nil) (= (hk-peek-value) ":")) (do (hk-advance!) ":")) (:else (hk-err "expected operator in member list")))))
|
|
(hk-expect! "rparen" nil)
|
|
op-name)))
|
|
(:else (hk-err "expected identifier in member list")))))
|
|
(define
|
|
hk-parse-ent
|
|
(fn
|
|
(allow-module?)
|
|
(cond
|
|
((hk-match? "varid" nil)
|
|
(list :ent-var (get (hk-advance!) "value")))
|
|
((hk-match? "qvarid" nil)
|
|
(list :ent-var (get (hk-advance!) "value")))
|
|
((and allow-module? (hk-match? "reserved" "module"))
|
|
(do
|
|
(hk-advance!)
|
|
(cond
|
|
((or (hk-match? "conid" nil) (hk-match? "qconid" nil))
|
|
(list :ent-module (get (hk-advance!) "value")))
|
|
(:else (hk-err "expected module name in export")))))
|
|
((or (hk-match? "conid" nil) (hk-match? "qconid" nil))
|
|
(let
|
|
((name (get (hk-advance!) "value")))
|
|
(cond
|
|
((hk-match? "lparen" nil)
|
|
(do
|
|
(hk-advance!)
|
|
(cond
|
|
((hk-match? "reservedop" "..")
|
|
(do
|
|
(hk-advance!)
|
|
(hk-expect! "rparen" nil)
|
|
(list :ent-all name)))
|
|
((hk-match? "rparen" nil)
|
|
(do (hk-advance!) (list :ent-with name (list))))
|
|
(:else
|
|
(let
|
|
((mems (list)))
|
|
(append! mems (hk-parse-ent-member))
|
|
(define
|
|
hk-mem-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(hk-match? "comma" nil)
|
|
(do
|
|
(hk-advance!)
|
|
(when
|
|
(not (hk-match? "rparen" nil))
|
|
(append! mems (hk-parse-ent-member)))
|
|
(hk-mem-loop)))))
|
|
(hk-mem-loop)
|
|
(hk-expect! "rparen" nil)
|
|
(list :ent-with name mems))))))
|
|
(:else (list :ent-var name)))))
|
|
((hk-match? "lparen" nil)
|
|
(do
|
|
(hk-advance!)
|
|
(let
|
|
((op-name (cond ((hk-match? "varsym" nil) (get (hk-advance!) "value")) ((hk-match? "consym" nil) (get (hk-advance!) "value")) ((and (hk-match? "reservedop" nil) (= (hk-peek-value) ":")) (do (hk-advance!) ":")) (:else (hk-err "expected operator in parens")))))
|
|
(hk-expect! "rparen" nil)
|
|
(list :ent-var op-name))))
|
|
(:else (hk-err "expected entity in import/export list")))))
|
|
(define
|
|
hk-parse-ent-list
|
|
(fn
|
|
(allow-module?)
|
|
(hk-expect! "lparen" nil)
|
|
(cond
|
|
((hk-match? "rparen" nil) (do (hk-advance!) (list)))
|
|
(:else
|
|
(let
|
|
((items (list)))
|
|
(append! items (hk-parse-ent allow-module?))
|
|
(define
|
|
hk-el-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(hk-match? "comma" nil)
|
|
(do
|
|
(hk-advance!)
|
|
(when
|
|
(not (hk-match? "rparen" nil))
|
|
(append! items (hk-parse-ent allow-module?)))
|
|
(hk-el-loop)))))
|
|
(hk-el-loop)
|
|
(hk-expect! "rparen" nil)
|
|
items)))))
|
|
(define
|
|
hk-parse-import
|
|
(fn
|
|
()
|
|
(hk-expect! "reserved" "import")
|
|
(let
|
|
((qualified false) (modname nil) (as-name nil) (spec nil))
|
|
(when
|
|
(hk-match? "varid" "qualified")
|
|
(do (hk-advance!) (set! qualified true)))
|
|
(cond
|
|
((or (hk-match? "conid" nil) (hk-match? "qconid" nil))
|
|
(set! modname (get (hk-advance!) "value")))
|
|
(:else (hk-err "expected module name in import")))
|
|
(when
|
|
(hk-match? "varid" "as")
|
|
(do
|
|
(hk-advance!)
|
|
(cond
|
|
((or (hk-match? "conid" nil) (hk-match? "qconid" nil))
|
|
(set! as-name (get (hk-advance!) "value")))
|
|
(:else (hk-err "expected name after 'as'")))))
|
|
(cond
|
|
((hk-match? "varid" "hiding")
|
|
(do
|
|
(hk-advance!)
|
|
(set! spec (list :spec-hiding (hk-parse-ent-list false)))))
|
|
((hk-match? "lparen" nil)
|
|
(set! spec (list :spec-items (hk-parse-ent-list false)))))
|
|
(list :import qualified modname as-name spec))))
|
|
(define
|
|
hk-parse-module-header
|
|
(fn
|
|
()
|
|
(hk-expect! "reserved" "module")
|
|
(let
|
|
((modname nil) (exports nil))
|
|
(cond
|
|
((or (hk-match? "conid" nil) (hk-match? "qconid" nil))
|
|
(set! modname (get (hk-advance!) "value")))
|
|
(:else (hk-err "expected module name")))
|
|
(when
|
|
(hk-match? "lparen" nil)
|
|
(set! exports (hk-parse-ent-list true)))
|
|
(hk-expect! "reserved" "where")
|
|
(list modname exports))))
|
|
(define
|
|
hk-collect-module-body
|
|
(fn
|
|
()
|
|
(let
|
|
((imports (list)) (decls (list)))
|
|
(define
|
|
hk-imp-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(hk-match? "reserved" "import")
|
|
(do
|
|
(append! imports (hk-parse-import))
|
|
(when
|
|
(or (hk-match? "vsemi" nil) (hk-match? "semi" nil))
|
|
(do (hk-advance!) (hk-imp-loop)))))))
|
|
(hk-imp-loop)
|
|
(define
|
|
hk-body-at-end?
|
|
(fn
|
|
()
|
|
(or
|
|
(nil? (hk-peek))
|
|
(= (hk-peek-type) "eof")
|
|
(hk-match? "vrbrace" nil)
|
|
(hk-match? "rbrace" nil))))
|
|
(when
|
|
(not (hk-body-at-end?))
|
|
(do
|
|
(append! decls (hk-parse-decl))
|
|
(define
|
|
hk-body-loop
|
|
(fn
|
|
()
|
|
(when
|
|
(or (hk-match? "vsemi" nil) (hk-match? "semi" nil))
|
|
(do
|
|
(hk-advance!)
|
|
(when
|
|
(not (hk-body-at-end?))
|
|
(append! decls (hk-parse-decl)))
|
|
(hk-body-loop)))))
|
|
(hk-body-loop)))
|
|
(list imports decls))))
|
|
(define
|
|
hk-parse-program
|
|
(fn
|
|
()
|
|
(cond
|
|
((hk-match? "reserved" "module")
|
|
(let
|
|
((header (hk-parse-module-header)))
|
|
(let
|
|
((explicit (hk-match? "lbrace" nil)))
|
|
(if explicit (hk-advance!) (hk-expect! "vlbrace" nil))
|
|
(let
|
|
((body (hk-collect-module-body)))
|
|
(if
|
|
explicit
|
|
(hk-expect! "rbrace" nil)
|
|
(hk-expect! "vrbrace" nil))
|
|
(list
|
|
:module (nth header 0)
|
|
(nth header 1)
|
|
(nth body 0)
|
|
(nth body 1))))))
|
|
(:else
|
|
(let
|
|
((body (hk-collect-module-body)))
|
|
(if
|
|
(empty? (nth body 0))
|
|
(list :program (nth body 1))
|
|
(list :module nil nil (nth body 0) (nth body 1))))))))
|
|
(let
|
|
((start-brace (or (hk-match? "vlbrace" nil) (hk-match? "lbrace" nil))))
|
|
(when start-brace (hk-advance!))
|
|
(let
|
|
((result (cond ((= mode :expr) (hk-parse-expr-inner)) ((= mode :module) (hk-parse-program)) (:else (hk-err "unknown parser mode")))))
|
|
(when
|
|
start-brace
|
|
(when
|
|
(or (hk-match? "vrbrace" nil) (hk-match? "rbrace" nil))
|
|
(hk-advance!)))
|
|
result)))))
|
|
|
|
(define hk-parse-expr (fn (tokens) (hk-parser tokens :expr)))
|
|
(define hk-parse-module (fn (tokens) (hk-parser tokens :module)))
|
|
|
|
;; ── Convenience: tokenize + layout + parse ───────────────────────
|
|
(define
|
|
hk-parse
|
|
(fn (src) (hk-parse-expr (hk-layout (hk-tokenize src)))))
|
|
|
|
(define
|
|
hk-parse-top
|
|
(fn (src) (hk-parse-module (hk-layout (hk-tokenize src)))))
|