/
port-test.arr
206 lines (188 loc) · 6.25 KB
/
port-test.arr
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import string-dict as D
import equality as E
import valueskeleton as VS
import "atom.arr" as A
import "term.arr" as T
import "sugar.arr" as S
type Var = A.Var
mk-var = A.mk-var
free-var = A.free-var
var-to-str = A.var-to-str
type Term = T.Term
signature = T.signature
s-empty = T.s-empty
s-child = T.s-child
s-union = T.s-union
s-compose = T.s-compose
t-node = T.t-node
t-refn = T.t-refn
t-decl = T.t-decl
t-hole = T.t-hole
t-tag = T.t-tag
t-val = T.t-val
is-t-node = T.is-t-node
resolve = T.resolve
unresolve = T.unresolve
iso = T.iso
_match = S._match
substitute = S.substitute
desugar = S.desugar-full
resugar = S.resugar-full
data Config:
| config(term :: Term, env :: D.StringDict)
| answer(val :: Any)
end
# From the paper
check "Port Test":
sigs = [D.string-dict:
"plus", signature([list: s-empty, s-empty], s-empty),
"if", signature([list: s-empty, s-empty, s-empty], s-empty),
"let", signature([list: s-empty, s-empty, s-child(0)], s-empty),
"write", signature([list: s-empty, s-empty], s-empty),
"log", signature([list: s-empty, s-empty, s-empty], s-empty),
"str", signature([list: s-empty], s-empty)
]
fun step(term :: Term, env :: D.StringDict) -> Config:
fun similar(x, y):
# Tags are associated with a node
(is-t-node(x) and is-t-node(y)) and (x.id == y.id)
end
cases(Term) term:
| t-val(val) => answer(val)
| t-tag(left, right, shadow term) =>
cases(Config) step(term, env):
| answer(val) => answer(val)
| config(term2, env2) =>
if similar(term, term2):
config(t-tag(left, right, term2), env2)
else:
config(term2, env2)
end
end
| t-refn(v) =>
config(t-val(env.get-value(var-to-str(v))), env)
| t-node(con, id, ts) =>
ask:
| con == "str" then:
answer(ts.get(0).val)
| con == "plus" then:
cases(Config) step(ts.get(0), env):
| answer(left) =>
cases(Config) step(ts.get(1), env):
| answer(right) => answer(left + right)
| config(right, _) =>
config(t-node(con, id, [list: t-val(left), right]), env)
end
| config(left, _) =>
config(t-node(con, id, [list: left, ts.get(1)]), env)
end
| con == "if" then:
cases(Config) step(ts.get(0), env):
| answer(cond) =>
ask:
| cond == "true" then: config(ts.get(1), env)
| otherwise: config(ts.get(2), env)
end
| config(cond, _) =>
config(t-node(con, id, [list: cond, ts.get(1), ts.get(2)]), env)
end
| con == "let" then:
cases(Config) step(ts.get(1), env):
| answer(arg) =>
new-env = env.set(var-to-str(ts.get(0).v), arg)
config(ts.get(2), new-env)
| config(arg, _) =>
config(t-node(con, id, [list: ts.get(0), arg, ts.get(2)]), env)
end
| con == "write" then:
# Not bothering to model side-effects
cases(Config) step(ts.get(0), env):
| answer(arg0) =>
cases(Config) step(ts.get(1), env):
| answer(arg1) =>
answer("WRITE: " + arg0 + " TO: " + arg1)
| config(arg1, _) =>
config(t-node(con, id, [list: t-val(arg0), arg1]), env)
end
| config(arg0, _) =>
config(t-node(con, id, [list: arg0, ts.get(1)]), env)
end
end
end
end
fun str-node(str):
t-node("str", 0, [list: t-val(str)])
end
fun if-node(a, b, c):
t-node("if", 0, [list: a, b, c])
end
fun write-node(a, b):
t-node("write", 0, [list: a, b])
end
fun let-node(a, b, c):
t-node("let", 0, [list: t-decl(a), b, c])
end
fun plus-node(a, b):
t-node("plus", 0, [list: a, b])
end
fun log-node(a, b, c):
t-node("log", 0, [list: a, b, c])
end
fun test-step(term, expected):
cases(Config) step(term, [D.string-dict:]):
| answer(ans) => t-val(ans).display()
| config(shadow term, _) => term.display()
end is expected
end
test-step(str-node("ok"), "<ok>")
test-step(plus-node(str-node("x"), str-node("y")), "<xy>")
test-step(write-node(str-node("x"), str-node("y")),
"<WRITE: x TO: y>")
test-step(if-node(str-node("true"), str-node("then"), str-node("else")),
"str(<then>)")
test-step(if-node(str-node("false"), str-node("then"), str-node("else")),
"str(<else>)")
test-step(let-node(free-var("x"), str-node("a"), str-node("b")),
"str(<b>)")
fun desugar-log(ctx):
let-node(free-var("port"),
if-node(ctx.get(2), ctx.get(1), str-node("DEVNULL")),
write-node(ctx.get(0), t-refn(free-var("port"))))
end
sugar = [D.string-dict:
"log", desugar-log,
"plus", lam(ctx): ctx end,
"if", lam(ctx): ctx end,
"write", lam(ctx): ctx end,
"let", lam(ctx): ctx end,
"str", lam(ctx): ctx end]
port = free-var("port")
verbose = free-var("verbose")
test-term = let-node(port, str-node("80"),
log-node(plus-node(str-node("Port: "), t-refn(port)),
if-node(t-refn(verbose), str-node("stderr"), str-node("devnull")),
str-node("true")))
var STEPS = [list: test-term.display()]
shadow test-term = desugar(sigs, sugar, test-term)
fun eval(term :: Term):
fun run(shadow term, env):
cases(Config) step(term, env):
| answer(val) => STEPS := link(t-val(val).display(), STEPS)
| config(shadow term, shadow env) =>
cases(Option) resugar(sigs, sugar, term):
| none => nothing
| some(shadow term) =>
STEPS := link(term.display(), STEPS)
end
run(term, env)
end
end
run(term, [D.string-dict: "verbose:0", "true"])
STEPS := STEPS.reverse()
end
eval(test-term)
STEPS.get(0) is "let($port, str(<80>), log(plus(str(<Port: >), port), if(verbose, str(<stderr>), str(<devnull>)), str(<true>)))"
STEPS.get(1) is "log(plus(str(<Port: >), port), if(verbose, str(<stderr>), str(<devnull>)), str(<true>))"
STEPS.get(2) is "<WRITE: Port: 80 TO: stderr>"
nothing
end