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Use match instead of cond.

This commit is contained in:
sforman 2023-10-11 20:01:35 -07:00
parent 8e15a657ed
commit 93556efeeb
1 changed files with 36 additions and 37 deletions
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73
implementations/scheme-chicken/joy.scm
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@ -27,6 +27,7 @@
(import (chicken io)) (import (chicken io))
(import (chicken string)) (import (chicken string))
(import srfi-69) (import srfi-69)
(import matchable)
;(load "defs.scm") ; csc -prologue defs.scm joy.scm ;(load "defs.scm") ; csc -prologue defs.scm joy.scm
(cond-expand (cond-expand
@ -53,50 +54,48 @@
(joy (cons (car expression) stack) (cdr expression) dict)))) (joy (cons (car expression) stack) (cdr expression) dict))))
(define (joy-eval symbol stack expression dict) (define (joy-eval symbol stack expression dict)
(define (is-it? name) (string=? symbol name)) (match symbol
(cond ("+" ((joy-func +) stack expression dict))
((is-it? "+") ((joy-func +) stack expression dict)) ("-" ((joy-func -) stack expression dict))
((is-it? "-") ((joy-func -) stack expression dict)) ("*" ((joy-func *) stack expression dict))
((is-it? "*") ((joy-func *) stack expression dict)) ("/" ((joy-func quotient) stack expression dict)) ; but for negative divisor, no!?
((is-it? "/") ((joy-func quotient) stack expression dict)) ; but for negative divisor, no!? ("%" ((joy-func modulo) stack expression dict))
((is-it? "%") ((joy-func modulo) stack expression dict))
((is-it? "add") ((joy-func +) stack expression dict)) ("add" ((joy-func +) stack expression dict))
((is-it? "sub") ((joy-func -) stack expression dict)) ("sub" ((joy-func -) stack expression dict))
((is-it? "mul") ((joy-func *) stack expression dict)) ("mul" ((joy-func *) stack expression dict))
((is-it? "div") ((joy-func quotient) stack expression dict)) ; but for negative divisor, no!? ("div" ((joy-func quotient) stack expression dict)) ; but for negative divisor, no!?
((is-it? "mod") ((joy-func modulo) stack expression dict)) ("mod" ((joy-func modulo) stack expression dict))
((is-it? "<") ((joy-func <) stack expression dict)) ("<" ((joy-func <) stack expression dict))
((is-it? ">") ((joy-func >) stack expression dict)) (">" ((joy-func >) stack expression dict))
((is-it? "<=") ((joy-func <=) stack expression dict)) ("<=" ((joy-func <=) stack expression dict))
((is-it? ">=") ((joy-func >=) stack expression dict)) (">=" ((joy-func >=) stack expression dict))
((is-it? "=") ((joy-func =) stack expression dict)) ("=" ((joy-func =) stack expression dict))
((is-it? "<>") ((joy-func not-equal) stack expression dict)) ("<>" ((joy-func not-equal) stack expression dict))
((is-it? "!=") ((joy-func not-equal) stack expression dict)) ("!=" ((joy-func not-equal) stack expression dict))
((is-it? "bool") (joy-bool stack expression dict)) ("bool" (joy-bool stack expression dict))
((is-it? "dup") (values (cons (car stack) stack) expression dict)) ("dup" (values (cons (car stack) stack) expression dict))
((is-it? "pop") (values (cdr stack) expression dict)) ("pop" (values (cdr stack) expression dict))
((is-it? "stack") (values (cons stack stack) expression dict)) ("stack" (values (cons stack stack) expression dict))
((is-it? "swaack") (values (cons (cdr stack) (car stack)) expression dict)) ("swaack" (values (cons (cdr stack) (car stack)) expression dict))
((is-it? "swap") (values (cons (cadr stack) (cons (car stack) (cddr stack))) expression dict)) ("swap" (values (cons (cadr stack) (cons (car stack) (cddr stack))) expression dict))
((is-it? "concat") ((joy-func append) stack expression dict)) ("concat" ((joy-func append) stack expression dict))
((is-it? "cons") ((joy-func cons) stack expression dict)) ("cons" ((joy-func cons) stack expression dict))
((is-it? "first") (values (cons (caar stack) (cdr stack)) expression dict)) ("first" (values (cons (caar stack) (cdr stack)) expression dict))
((is-it? "rest") (values (cons (cdar stack) (cdr stack)) expression dict)) ("rest" (values (cons (cdar stack) (cdr stack)) expression dict))
((is-it? "i") (joy-i stack expression dict)) ("i" (joy-i stack expression dict))
((is-it? "dip") (joy-dip stack expression dict)) ("dip" (joy-dip stack expression dict))
((is-it? "branch") (joy-branch stack expression dict)) ("branch" (joy-branch stack expression dict))
((is-it? "loop") (joy-loop stack expression dict)) ("loop" (joy-loop stack expression dict))
((hash-table-exists? dict symbol) (_ (if (hash-table-exists? dict symbol)
(values stack (append (hash-table-ref dict symbol) expression) dict)) (values stack (append (hash-table-ref dict symbol) expression) dict)
(error (conc "Unknown word: " symbol))))))
(else (error (conc "Unknown word: " symbol)))))
(define (not-equal a b) (not (= a b))) (define (not-equal a b) (not (= a b)))