; FP interpreter/compiler
; Copyright (c) 1982 Scott B. Baden
; Copyright (c) 1982 Regents of the University of California.
; All rights reserved. The Berkeley software License Agreement
; specifies the terms and conditions for redistribution.
(setq SCCS-parser.l "@(#)parser.l 5.1 (Berkeley) 5/31/85")
(localf get_condit trap_err Push
prs_fn get_def get_constr get_while Pop))
((tkn (get_tkn) (get_tkn))
(rslt nil) (action nil) (wslen 0) (stk nil))
((eq tkn 'eof$$) (cond ((eq flag 'top_lev) 'eof$$)
(t (*throw 'parse$err '(err$$ eof)))))
(cond ((null (plist (prs_fn))) (*throw 'parse$err `(err$$ unknown ,tkn))))
(cond ((find 'badtkn$$ tkn) (*throw 'parse$err `(err$$ badtkn ,(cadr tkn)))))
(setq action (get (prs_fn) flag))
(cond ((null action) (*throw 'parse$err `(err$$ illeg ,tkn))))
(setq rslt (funcall action))
(cond ((eq rslt 'cmd$$) (return rslt)))
(cond ((not (listp rslt)) (*throw 'parse$err `(err$$ fatal1 ,stk ,tkn ,rslt))))
(cond ((eq (car rslt) 'return)
(cond ((eq (cadr rslt) 'done) (cdr rslt))
(cond ((eq flag 'while$$)
(cond ((or (zerop wslen) (onep wslen))
((twop wslen) (*throw 'parse$err `(err$$ bad_whl ,stk ,tkn)))
(t (*throw 'parse$err '(err$$ bad_while parse)))))
(cond ((null stk) (Push (cadr rslt)))
(t (*throw 'parse$err `(err$$ stk_ful ,stk ,tkn)))))))
((eq (car rslt) 'nothing))
(t (*throw 'parse$err `(err$$ fatal2 ,stk ,tkn ,rslt)))))))
; These are the parse action functions.
; There is one for each token-context combination.
; top_lev,constr$$,compos$$,alpha$$,insert$$.
; The name of each function is formed by appending p$ to the
; name of the token just parsed.
; For each function name there is actually a set of functions
; associated by a plist (keyed on the context).
(defun (p$lbrace$$ top_lev) nil
(cond (in_def (*throw 'parse$err '(err$$ ill_lbrace)))
(t (list 'nothing (get_def)))))
(defun (p$rbrace$$ top_lev) nil
(cond ((not in_def) (*throw 'parse$err '(err$$ ill_rbrace)))
(cond ((null stk) (*throw 'parse$err '(err$$ stk_emp)))
(defun (p$rbrace$$ semi$$) nil
((not in_def) (*throw 'parse$err '(err$$ ill_rbrace)))
(cond ((null stk) (*throw 'parse$err '(err$$ stk_emp)))
(cond ((find 'err$$ p) (*throw 'parse$err p))
(defun (p$lparen$$ top_lev) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_lpar)))
(t `(Push ,(trap_err (*catch '(parse$err end_while end_condit) (parse tkn)))))))
(defun (p$lparen$$ constr$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_lpar)))
(t `(Push ,(trap_err (*catch '(parse$err end_while end_condit) (parse tkn)))))))
(defun (p$lparen$$ compos$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_lpar)))
(t `(return ,(trap_err (*catch '(parse$err end_while end_condit) (parse tkn)))))))
(defun (p$lparen$$ alpha$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_lpar)))
(t `(return ,(trap_err (*catch '(parse$err end_while end_condit) (parse tkn)))))))
(defun (p$lparen$$ ti$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_lpar)))
(t `(return ,(trap_err (*catch '(parse$err end_while end_condit) (parse tkn)))))))
(defun (p$lparen$$ insert$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_lpar)))
(t `(return ,(trap_err (*catch '(parse$err end_while end_condit) (parse tkn)))))))
(defun (p$lparen$$ arrow$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_lpar)))
(t `(Push ,(trap_err (*catch '(parse$err end_while end_condit) (parse tkn)))))))
(defun (p$lparen$$ semi$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_lpar)))
(t `(Push ,(trap_err (*catch '(parse$err end_while end_condit) (parse tkn)))))))
(defun (p$lparen$$ lparen$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_lpar)))
(t `(Push ,(trap_err (*catch '(parse$err end_while end_condit) (parse tkn)))))))
(defun (p$lparen$$ while$$) nil
(cond ((twop wslen) (*throw 'parse$err '(err$$ ill_lpar)))
(t `(Push ,(trap_err (*catch '(parse$err end_while end_condit) (parse tkn)))))))
(defun (p$rparen$$ lparen$$) nil
(defun (p$rparen$$ top_lev) nil ; process commands
(cond ((not (null stk)) (*throw 'parse$err '(err$$ unbalparen)))
(t (cond ((null infile) (get_cmd))
(t (patom "commands may not be issued from a file")
(defun (p$rparen$$ semi$$) nil
(defun (p$rparen$$ while$$) nil
`(return ,(nreverse (list (Pop) (Pop)))))
(defun (p$alpha$$ top_lev) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_alpha)))
(t `(Push ,(frm_hnk 'alpha$$ (parse tkn))))))
(defun (p$alpha$$ compos$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_alpha)))
(t `(return ,(frm_hnk 'alpha$$ (parse tkn))))))
(defun (p$alpha$$ constr$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_alpha)))
(t `(Push ,(frm_hnk 'alpha$$ (parse tkn))))))
(defun (p$alpha$$ insert$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_alpha)))
(t `(return ,(frm_hnk 'alpha$$ (parse tkn))))))
(defun (p$alpha$$ ti$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_alpha)))
(t `(return ,(frm_hnk 'alpha$$ (parse tkn))))))
(defun (p$alpha$$ alpha$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_alpha)))
(t `(return ,(frm_hnk 'alpha$$ (parse tkn))))))
(defun (p$alpha$$ lparen$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_alpha)))
(t `(Push ,(frm_hnk 'alpha$$ (parse tkn))))))
(defun (p$alpha$$ arrow$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_alpha)))
(t `(Push ,(frm_hnk 'alpha$$ (parse tkn))))))
(defun (p$alpha$$ semi$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_alpha)))
(t `(Push ,(frm_hnk 'alpha$$ (parse tkn))))))
(defun (p$alpha$$ while$$) nil
(cond ((twop wslen) (*throw 'parse$err '(err$$ ill_alpha)))
(t `(Push ,(frm_hnk 'alpha$$ (parse tkn))))))
(defun (p$insert$$ top_lev) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_insert)))
(t `(Push ,(frm_hnk 'insert$$ (parse tkn))))))
(defun (p$insert$$ compos$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_insert)))
(t `(return ,(frm_hnk 'insert$$ (parse tkn))))))
(defun (p$insert$$ constr$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_insert)))
(t `(Push ,(frm_hnk 'insert$$ (parse tkn))))))
(defun (p$insert$$ insert$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_insert)))
(t `(return ,(frm_hnk 'insert$$ (parse tkn))))))
(defun (p$insert$$ ti$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_insert)))
(t `(return ,(frm_hnk 'insert$$ (parse tkn))))))
(defun (p$insert$$ alpha$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_insert)))
(t `(return ,(frm_hnk 'insert$$ (parse tkn))))))
(defun (p$insert$$ lparen$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_insert)))
(t `(Push ,(frm_hnk 'insert$$ (parse tkn))))))
(defun (p$insert$$ arrow$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_insert)))
(t `(Push ,(frm_hnk 'insert$$ (parse tkn))))))
(defun (p$insert$$ semi$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_insert)))
(t `(Push ,(frm_hnk 'insert$$ (parse tkn))))))
(defun (p$insert$$ while$$) nil
(cond ((twop wslen) (*throw 'parse$err '(err$$ ill_insert)))
(t `(Push ,(frm_hnk 'insert$$ (parse tkn))))))
(defun (p$ti$$ top_lev) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_ai)))
(t `(Push ,(frm_hnk 'ti$$ (parse tkn))))))
(defun (p$ti$$ compos$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_ai)))
(t `(return ,(frm_hnk 'ti$$ (parse tkn))))))
(defun (p$ti$$ constr$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_ai)))
(t `(Push ,(frm_hnk 'ti$$ (parse tkn))))))
(defun (p$ti$$ insert$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_ai)))
(t `(return ,(frm_hnk 'ti$$ (parse tkn))))))
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_ai)))
(t `(return ,(frm_hnk 'ti$$ (parse tkn))))))
(defun (p$ti$$ alpha$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_ai)))
(t `(return ,(frm_hnk 'ti$$ (parse tkn))))))
(defun (p$ti$$ lparen$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_ai)))
(t `(Push ,(frm_hnk 'ti$$ (parse tkn))))))
(defun (p$ti$$ arrow$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_ai)))
(t `(Push ,(frm_hnk 'ti$$ (parse tkn))))))
(defun (p$ti$$ semi$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ ill_ai)))
(t `(Push ,(frm_hnk 'ti$$ (parse tkn))))))
(defun (p$ti$$ while$$) nil
(cond ((twop wslen) (*throw 'parse$err '(err$$ ill_ai)))
(t `(Push ,(frm_hnk 'ti$$ (parse tkn))))))
(defun (p$compos$$ top_lev) nil
`(Push ,(frm_hnk 'compos$$ (Pop) (parse tkn))))
(defun (p$compos$$ compos$$) nil
`(Push ,(frm_hnk 'compos$$ (Pop) (parse tkn))))
(defun (p$compos$$ constr$$) nil
`(Push ,(frm_hnk 'compos$$ (Pop) (parse tkn))))
(defun (p$compos$$ lparen$$) nil
`(Push ,(frm_hnk 'compos$$ (Pop) (parse tkn))))
(defun (p$compos$$ arrow$$) nil
`(Push ,(frm_hnk 'compos$$ (Pop) (parse tkn))))
(defun (p$compos$$ semi$$) nil
`(Push ,(frm_hnk 'compos$$ (Pop) (parse tkn))))
(defun (p$compos$$ while$$) nil
`(Push ,(frm_hnk 'compos$$ (Pop) (parse tkn))))
(defun (p$comma$$ constr$$) nil
(defun (p$comma$$ semi$$) nil
(defun (p$lbrack$$ top_lev) nil
(defun (p$lbrack$$ compos$$) nil
(defun (p$lbrack$$ constr$$) nil
(defun (p$lbrack$$ lparen$$) nil
(defun (p$lbrack$$ arrow$$) nil
(defun (p$lbrack$$ semi$$) nil
(defun (p$lbrack$$ alpha$$) nil
(defun (p$lbrack$$ insert$$) nil
(defun (p$lbrack$$ ti$$) nil
(defun (p$lbrack$$ while$$) nil
(defun (p$rbrack$$ constr$$) nil
`(return done ,(cond ((null stk) nil)
(defun (p$rbrack$$ semi$$) nil
`(rbrack$$ ,`(done ,(cond ((null stk) nil)
(defun (p$defined$$ top_lev) nil
`(Push ,(concat (cadr tkn) '_fp)))
(defun (p$defined$$ compos$$) nil
`(return ,(concat (cadr tkn) '_fp)))
(defun (p$defined$$ constr$$) nil
`(Push ,(concat (cadr tkn) '_fp)))
(defun (p$defined$$ lparen$$) nil
`(Push ,(concat (cadr tkn) '_fp)))
(defun (p$defined$$ arrow$$) nil
`(Push ,(concat (cadr tkn) '_fp)))
(defun (p$defined$$ semi$$) nil
`(Push ,(concat (cadr tkn) '_fp)))
(defun (p$defined$$ alpha$$) nil
`(return ,(concat (cadr tkn) '_fp)))
(defun (p$defined$$ insert$$) nil
`(return ,(concat (cadr tkn) '_fp)))
(defun (p$defined$$ ti$$) nil
`(return ,(concat (cadr tkn) '_fp)))
(defun (p$defined$$ while$$) nil
`(Push ,(concat (cadr tkn) '_fp)))
(defun (p$builtin$$ top_lev) nil
`(Push ,(concat (cadr tkn) '$fp)))
(defun (p$builtin$$ compos$$) nil
`(return ,(concat (cadr tkn) '$fp)))
(defun (p$builtin$$ constr$$) nil
`(Push ,(concat (cadr tkn) '$fp)))
(defun (p$builtin$$ lparen$$) nil
`(Push ,(concat (cadr tkn) '$fp)))
(defun (p$builtin$$ arrow$$) nil
`(Push ,(concat (cadr tkn) '$fp)))
(defun (p$builtin$$ semi$$) nil
`(Push ,(concat (cadr tkn) '$fp)))
(defun (p$builtin$$ alpha$$) nil
`(return ,(concat (cadr tkn) '$fp)))
(defun (p$builtin$$ insert$$) nil
`(return ,(concat (cadr tkn) '$fp)))
(defun (p$builtin$$ ti$$) nil
`(return ,(concat (cadr tkn) '$fp)))
(defun (p$builtin$$ while$$) nil
`(Push ,(concat (cadr tkn) '$fp)))
(defun (p$select$$ top_lev) nil
(defun (p$select$$ compos$$) nil
`(return ,(makhunk tkn)))
(defun (p$select$$ constr$$) nil
(defun (p$select$$ lparen$$) nil
(defun (p$select$$ arrow$$) nil
(defun (p$select$$ semi$$) nil
(defun (p$select$$ alpha$$) nil
`(return ,(makhunk tkn)))
(defun (p$select$$ while$$) nil
(defun (p$constant$$ top_lev) nil
(defun (p$constant$$ compos$$) nil
`(return ,(makhunk tkn)))
(defun (p$constant$$ constr$$) nil
(defun (p$constant$$ lparen$$) nil
(defun (p$constant$$ arrow$$) nil
(defun (p$constant$$ semi$$) nil
(defun (p$constant$$ alpha$$) nil
`(return ,(makhunk tkn)))
(defun (p$constant$$ while$$) nil
(defun (p$colon$$ top_lev) nil
(cond (in_def (*throw 'parse$err '(err$$ ill_appl)))
(defun (p$colon$$ semi$$) nil
(cond (in_def (*throw 'parse$err '(err$$ ill_appl)))
(defun (p$arrow$$ lparen$$) nil
(defun (p$semi$$ arrow$$) nil
(defun (p$while$$ lparen$$) nil
(cond ((not (null stk)) (*throw 'parse$err '(err$$ bad_while)))
; parse action support functions
(setq q (parse 'arrow$$))
(cond ((and (listp q) (find 'err$$ q)) (*throw 'parse$err q)))
(cond ((and (listp r) (find 'err$$ r)) (*throw 'parse$err r)))
(*throw 'end_condit (frm_hnk 'condit$$ (Pop) q r))))
(cond ((eq flag 'while$$)
((zerop wslen) (setq stk value) (setq wslen 1))
((onep wslen) (setq stk (list stk value)) (setq wslen 2))
(t (*throw 'parse$err '(err$$ bad_while Push)))))
((null stk) (*throw 'parse$err '(err$$ stk_emp)))
(cond ((eq flag 'while$$)
(cond ((onep wslen) (setq stk nil) (setq wslen 0) (return tmp))
(setq stk (car tmp)) (setq wslen 1) (return (cadr tmp)))
(t (*throw 'parse$err '(err$$ bad_while Pop)))))
(cond ((find 'builtin$$ dummy) (*throw 'parse$err '(err$$ redef)))
((not (find 'defined$$ dummy)) (*throw 'parse$err '(err$$ bad_nam)))
(t (setq fn_name (concat (cadr dummy) '_fp))))))
(cond ((eq flag 'while$$) (cond
((twop wslen) (*throw 'parse$err `(err$$ bad_whl ,stk ,tkn)))))
(t (cond ((not (null stk)) (*throw 'parse$err '(err$$ bad_constr parse))))))
((v (parse 'constr$$) (parse 'constr$$))
((eq tkn 'eof$$) (*throw 'parse$err '(err$$ eof$$)))
(cond ((eq (car v) 'err$$) (*throw 'parse$err v))
(cond ((eq (cadr v) 'err$$) (*throw 'parse$err (cdr v)))
(makhunk (cons 'constr$$ (reverse (cons (cadr v) fn_lst))))))))
(t (setq fn_lst (cons v fn_lst)))))
(t (setq fn_lst (cons v fn_lst))))))
(setq bad_one (assq 'err$$ (cdr l)))
(cond ((null bad_one) (return (makhunk l)))
(t (*throw 'parse$err bad_one))))))
(concat 'p$ (cond ((atom tkn) tkn)
(let ((r (parse 'while$$)))
(cond ((and (listp r) (find 'err$$ r)) (*throw 'parse$err r))
(t (*throw 'end_while (frm_hnk 'while$$ (car r) (cadr r)))))))