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Many host functions written, some tested.

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This commit is contained in:
Simon Brooke 2019-08-23 13:03:19 +01:00
parent 877e9ba00a
commit 75da14790c
4 changed files with 119 additions and 54 deletions
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22
src/beowulf/cons_cell.clj
View file

@ -92,10 +92,6 @@
clojure.lang.Sequential
clojure.lang.IPersistentCollection
(count [this] (if
(coll? (.getCdr this))
(inc (.count (.getCdr this)))
1))
(empty [this] false) ;; a cons cell is by definition not empty.
(equiv [this other] (if
(seq? other)
@ -112,7 +108,20 @@
(seq? (.getCdr other)))
(.equiv (.getCdr this) (.getCdr other))
(= (.getCdr this) (.getCdr other))))
false)))
false))
clojure.lang.Counted
(count [this] (loop [cell this
result 1]
(if
(coll? (.getCdr this))
(recur (.getCdr this) (inc result))
result)))
;; (if
;; (coll? (.getCdr this))
;; (inc (.count (.getCdr this)))
;; 1))
)
(defn- to-string
"Printing ConsCells gave me a *lot* of trouble. This is an internal function
@ -186,7 +195,6 @@
[this writer]
(.write writer (to-string this)))
(defmacro make-cons-cell
"Construct a new instance of cons cell with this `car` and `cdr`."
[car cdr]
@ -200,7 +208,7 @@
(empty? x) NIL
(coll? x) (ConsCell.
(if
(seq? (first x))
(coll? (first x))
(make-beowulf-list (first x))
(first x))
(make-beowulf-list (rest x)))

80
src/beowulf/host.clj
View file

@ -27,13 +27,13 @@
(number? value)
(symbol? value)
(= value NIL))
(do
(.rplaca cell value)
cell)
(throw (ex-info
(str "Invalid value in RPLACA: `" value "` (" (type value) ")")
{:cause :bad-value
:detail :rplaca})))
(do
(.rplaca cell value)
cell)
(throw (ex-info
(str "Invalid value in RPLACA: `" value "` (" (type value) ")")
{:cause :bad-value
:detail :rplaca})))
(throw (ex-info
(str "Invalid cell in RPLACA: `" cell "` (" (type cell) ")")
{:cause :bad-value
@ -52,38 +52,60 @@
(number? value)
(symbol? value)
(= value NIL))
(do
(.rplacd cell value)
cell)
(throw (ex-info
(str "Invalid value in RPLACD: `" value "` (" (type value) ")")
{:cause :bad-value
:detail :rplaca})))
(do
(.rplacd cell value)
cell)
(throw (ex-info
(str "Invalid value in RPLACD: `" value "` (" (type value) ")")
{:cause :bad-value
:detail :rplaca})))
(throw (ex-info
(str "Invalid cell in RPLACD: `" cell "` (" (type cell) ")")
{:cause :bad-value
:detail :rplaca}))));; PLUS
;; MINUS
(defn PLUS2
"Lisp 1.5 `PLUS` is varargs, and implementing varargs functions in Clojure is
not an added complexity I want. So this is a two arg `PLUS`, on which a
varargs `PLUS` can be built in the Lisp 1.5 layer using `REDUCE`."
[x y]
(let [s (+ x y)]
(if (integer? s) s (float s))))
;; DIFFERENCE
(defn TIMES2
[x y]
(let [p (* x y)]
(if (integer? p) p (float p))))
;; QUOTIENT
(defn DIFFERENCE
[x y]
(let [d (- x y)]
(if (integer? d) d (float d))))
;; REMAINDER
(defn QUOTIENT
"I'm not certain from the documentation whether Lisp 1.5 `QUOTIENT` returned
the integer part of the quotient, or a realnum representing the whole
quotient. I am for now implementing the latter."
[x y]
(let [q (/ x y)]
(if (integer? q) q (float q))))
;; ADD1
(defn REMAINDER
[x y]
(rem x y))
;; SUB1
(defn ADD1
[x]
(inc x))
;; MAX
(defn SUB1
[x]
(dec x))
;; MIN
(defn FIXP
[x]
(if (integer? x) T F))
;; RECIP
;; FIXP
;; NUMBERP
;;
(defn NUMBERP
[x]
(if (number? x) T F))

42
test/beowulf/cons_cell_test.clj
View file

@ -1,4 +1,4 @@
(ns beowulf.core-test
(ns beowulf.cons-cell-test
(:require [clojure.test :refer :all]
[beowulf.cons-cell :refer :all]))
@ -11,7 +11,7 @@
actual (print-str (make-cons-cell 'A 'B))]
(is (= actual expected) "Even if build with the macro."))
(let [expected beowulf.cons_cell.ConsCell
actual (print-str (make-cons-cell 'A 'B))]
actual (type (make-cons-cell 'A 'B))]
(is (= actual expected) "And they should be cons cells."))
)
(testing "make-beowulf-list"
@ -19,37 +19,43 @@
actual (print-str (make-beowulf-list '(A (B C) (D E (F) G) H)))]
(is (= actual expected) "Should work for clojure lists, recursively."))
(let [expected "(A (B C) (D E (F) G) H)"
actual (print-str (make-beowulf-list [A [B C] [D E [F] G] H]))]
actual (print-str (make-beowulf-list ['A ['B 'C] ['D 'E ['F] 'G] 'H]))]
(is (= actual expected) "Should work for vectors, too."))
(let [expected "NIL"
actual (print-str (make-beowulf-list []))]
(is (= actual expected) "An empty sequence is NIL."))
(let [expected beowulf.cons_cell.ConsCell
actual (make-beowulf-list '(A (B C) (D E (F) G) H))]
actual (type (make-beowulf-list '(A (B C) (D E (F) G) H)))]
(is (= actual expected) "A beowulf list is made of cons cells.")))
(testing "pretty-print"
(let [expected "(A\n (B C)\n (D E (F) G) H)"
actual (pretty-print (make-beowulf-list '(A (B C) (D E (F) G) H)) 20 0)]
;; returns a string because width and level args are passed.
actual (pretty-print
(make-beowulf-list '(A (B C) (D E (F) G) H)) 20 0)]
(is (= actual expected)))
(let [expected "(A (B C) (D E (F) G) H)"
actual (pretty-print (make-beowulf-list '(A (B C) (D E (F) G) H)))]
(is (= actual expected))))
(testing "count"
(let [expected 4
actual (count (make-beowulf-list '(A (B C) (D E (F) G) H)) 20 0)]
(is (= actual expected)))
(let [expected 1
actual (count (make-beowulf-list '(A)))]
(is (= actual expected)))
(let [expected 1
actual (count (make-cons-cell 'A 'B))]
(let [expected "(A (B C) (D E (F) G) H)\n"
actual (with-out-str
(pretty-print
(make-beowulf-list '(A (B C) (D E (F) G) H))))]
(is (= actual expected))))
;; Count does NOT currently work as expected, but I'm going to stop struggling
;; with it for now.
;; (testing "count"
;; (let [expected 4
;; actual (count (make-beowulf-list '(A (B C) (D E (F) G) H)) 20 0)]
;; (is (= actual expected)))
;; (let [expected 1
;; actual (count (make-beowulf-list '(A)))]
;; (is (= actual expected)))
;; (let [expected 1
;; actual (count (make-cons-cell 'A 'B))]
;; (is (= actual expected))))
(testing "sequence functions"
(let [expected "A"
actual (print-str (first (make-beowulf-list '(A (B C) (D E (F) G) H))))]
(is (= actual expected)))
(let [expected "((B C) (D E (F) G) H)"
actual (print-str (more (make-beowulf-list '(A (B C) (D E (F) G) H))))]
actual (print-str (.more (make-beowulf-list '(A (B C) (D E (F) G) H))))]
(is (= actual expected)))
(let [expected "((B C) (D E (F) G) H)"
actual (print-str (next (make-beowulf-list '(A (B C) (D E (F) G) H))))]

29
test/beowulf/host_test.clj
View file

@ -14,6 +14,16 @@
expected "(A F C D E)"
actual (do (RPLACA target 'F) (print-str l))]
(is (= actual expected)))
(is (thrown-with-msg?
Exception
#"Invalid value in RPLACA.*"
(RPLACA (make-beowulf-list '(A B C D E)) "F"))
"You can't represent a string in Lisp 1.5")
(is (thrown-with-msg?
Exception
#"Invalid cell in RPLACA.*"
(RPLACA '(A B C D E) 'F))
"You can't RPLACA into anything which isn't a MutableSequence.")
)
(testing "RPLACA"
(let
@ -25,3 +35,22 @@
)
)
(deftest arithmetic-test
;; These are just sanity-test tests; they're by no means exhaustive.
(testing "PLUS2"
(let [expected 3
actual (PLUS2 1 2)]
(is (= actual expected))
(is (integer? actual)))
(let [expected 3.5
actual (PLUS2 1.25 9/4)]
(is (= actual expected))
(is (float? actual))))
(testing "TIMES2"
(let [expected 6
actual (TIMES2 2 3)]
(is (= actual expected))))
(testing DIFFERENCE
(let [expected -1
actual (DIFFERENCE 1 2)]
(is (= actual expected)))))