ludus/janet/language.test.janet

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# testing Ludus langauge constructs
(try (os/cd "janet") ([_] nil)) # for REPL
(import /scanner :as s)
(import /parser :as p)
(import /validate :as v)
(import /interpreter :as i)
(import /errors :as e)
(import /base :as b)
(use judge)
(defn run [source]
(def ctx @{})
(def scanned (s/scan source :test))
(when (any? (scanned :errors))
(e/scan-error (scanned :errors)) (error "scanning errors"))
(def parsed (p/parse scanned))
(when (any? (parsed :errors))
(e/parse-error (parsed :errors)) (error "parsing errors"))
(def valid (v/valid parsed ctx))
(when (any? (valid :errors)) (each err (valid :errors)
(e/validation-error err)) (error "validation errors"))
(i/interpret (parsed :ast) ctx))
(deftest "returns bare values from single-line scripts"
(test (run "true") true)
(test (run "false") false)
(test (run "nil") :^nil)
(test (run "12.34") 12.34)
(test (run "-32") -32)
(test (run "0") 0)
(test (run ":foo") :foo)
(test (run ":bar") :bar)
(test (run `"a string, a text, a language"`) "a string, a text, a language"))
(deftest "returns empty collections from single-line scripts"
(test (run "()") [])
(test (run "#{}") @{})
(test (run "${}") @{:^type :set})
(test (run "[]") @[]))
(deftest "returns populated collections from single-line scripts"
(test (run "(1, 2, 3)") [1 2 3])
(test (run "[:a, :b, :c]") @[:a :b :c])
(test (run "${1, 2, 3, 3}") @{1 true 2 true 3 true :^type :set})
(test (run "#{:a 1, :b 2}") @{:a 1 :b 2}))
(deftest "returns nested collections from single-line scripts"
(test (run "((), (1, 2), [:a, (:b)], #{:foo true, :bar false})")
[[]
[1 2]
@[:a [:b]]
@{:bar false :foo true}])
(test (run `#{:foo #{:bar "thing", :baz (1, :foo, nil)}}`) @{:foo @{:bar "thing" :baz [1 :foo :^nil]}}))
(deftest "binds names in let bindings with various patterns"
(test (run `let foo = :bar; foo`) :bar)
(test (run `let 42 = 42`) 42)
(test (run `let foo = :bar; let quux = 42; (foo, quux)`) [:bar 42])
(test (run `let (:ok, value) = (:ok, 42); value`) 42)
(test (run `let #{:a x, ...} = #{:a 1, :b 2}; x`) 1))
(deftest "executes if/then/else properly"
(test (run `if nil then :foo else :bar`) :bar)
(test (run `if false then :foo else :bar`) :bar)
(test (run `if true then :foo else :bar`) :foo)
(test (run `if 42 then :foo else panic! "oops"`) :foo))
(deftest "panics"
(test-error (run `panic! "oops"`)
{:msg "oops"
:node {:data {:data "oops"
:token {:input :test
:lexeme "\"oops\""
:line 1
:literal "oops"
:source "panic! \"oops\""
:start 7
:type :string}
:type :string}
:token {:input :test
:lexeme "panic!"
:line 1
:literal :none
:source "panic! \"oops\""
:start 0
:type :panic}
:type :panic}})
)
(deftest "no match in let panics"
(test-error (run "let :foo = :bar")
{:msg "no match: let binding"
:node {:data @[{:data :foo
:token {:input :test
:lexeme ":foo"
:line 1
:literal :foo
:source "let :foo = :bar"
:start 4
:type :keyword}
:type :keyword}
{:data :bar
:token {:input :test
:lexeme ":bar"
:line 1
:literal :bar
:source "let :foo = :bar"
:start 11
:type :keyword}
:type :keyword}]
:token {:input :test
:lexeme "let"
:line 1
:literal :none
:source "let :foo = :bar"
:start 0
:type :let}
:type :let}
:value :bar})
)
(deftest "blocks execute code and work"
(test (run `
let bar = 12
let foo = {
let bar = 42
let baz = :quux
:foo
}
(foo, bar)
`)
[:foo 12])
(test (run `
let foo = {
let bar = 12
{
let bar = 15
bar
}
}
`)
15))
(deftest "unbound name panics"
(test-error (run `foo`) "validation errors"))
(deftest "rebinding name panics"
(test-error (run `let foo = 42; let foo = 23`) "validation errors"))
(deftest "when forms work as expected"
(test (run `
when {
false -> :nope
nil -> :nope
12 -> :yes
}
`)
:yes)
(test-error (run `
when {
false -> :nope
nil -> :nope
}
`)
{:msg "no match: when form"
:node {:data @[[{:data false
:token {:input :test
:lexeme "false"
:line 2
:literal false
:source " when {\n false -> :nope\n nil -> :nope\n }\n "
:start 12
:type :false}
:type :bool}
{:data :nope
:token {:input :test
:lexeme ":nope"
:line 2
:literal :nope
:source " when {\n false -> :nope\n nil -> :nope\n }\n "
:start 21
:type :keyword}
:type :keyword}]
[{:token {:input :test
:lexeme "nil"
:line 3
:literal :none
:source " when {\n false -> :nope\n nil -> :nope\n }\n "
:start 30
:type :nil}
:type :nil}
{:data :nope
:token {:input :test
:lexeme ":nope"
:line 3
:literal :nope
:source " when {\n false -> :nope\n nil -> :nope\n }\n "
:start 37
:type :keyword}
:type :keyword}]]
:token {:input :test
:lexeme "when"
:line 1
:literal :none
:source " when {\n false -> :nope\n nil -> :nope\n }\n "
:start 2
:type :when}
:type :when}})
)
(deftest "match forms work as expected"
(test (run `
match :foo with {
:bar -> :nope
:baz -> :nope
x -> x
}
`)
:foo)
(test (run `
let foo = 42
match (:ok, foo) with {
(:err, _) -> :nope
(:ok, :foo) -> :nope
(:ok, _) -> :yes
}
`)
:yes)
(test-error (run `
let foo = "foo"
match foo with {
"bar" -> :nope
"baz" -> :nope
12.34 -> :nope
}
`)
{:msg "no match: match form"
:node @{:data [{:data "foo"
:token {:input :test
:lexeme "foo"
:line 2
:literal :none
:source " let foo = \"foo\"\n match foo with {\n \"bar\" -> :nope\n \"baz\" -> :nope\n 12.34 -> :nope \n }\n "
:start 26
:type :word}
:type :word}
@[[{:data "bar"
:token {:input :test
:lexeme "\"bar\""
:line 3
:literal "bar"
:source " let foo = \"foo\"\n match foo with {\n \"bar\" -> :nope\n \"baz\" -> :nope\n 12.34 -> :nope \n }\n "
:start 40
:type :string}
:type :string}
nil
{:data :nope
:token {:input :test
:lexeme ":nope"
:line 3
:literal :nope
:source " let foo = \"foo\"\n match foo with {\n \"bar\" -> :nope\n \"baz\" -> :nope\n 12.34 -> :nope \n }\n "
:start 49
:type :keyword}
:type :keyword}]
[{:data "baz"
:token {:input :test
:lexeme "\"baz\""
:line 4
:literal "baz"
:source " let foo = \"foo\"\n match foo with {\n \"bar\" -> :nope\n \"baz\" -> :nope\n 12.34 -> :nope \n }\n "
:start 58
:type :string}
:type :string}
nil
{:data :nope
:token {:input :test
:lexeme ":nope"
:line 4
:literal :nope
:source " let foo = \"foo\"\n match foo with {\n \"bar\" -> :nope\n \"baz\" -> :nope\n 12.34 -> :nope \n }\n "
:start 67
:type :keyword}
:type :keyword}]
[{:data 12.34
:token {:input :test
:lexeme "12.34"
:line 5
:literal 12.34
:source " let foo = \"foo\"\n match foo with {\n \"bar\" -> :nope\n \"baz\" -> :nope\n 12.34 -> :nope \n }\n "
:start 76
:type :number}
:type :number}
nil
{:data :nope
:token {:input :test
:lexeme ":nope"
:line 5
:literal :nope
:source " let foo = \"foo\"\n match foo with {\n \"bar\" -> :nope\n \"baz\" -> :nope\n 12.34 -> :nope \n }\n "
:start 85
:type :keyword}
:type :keyword}]]]
:match @match-fn
:token {:input :test
:lexeme "match"
:line 2
:literal :none
:source " let foo = \"foo\"\n match foo with {\n \"bar\" -> :nope\n \"baz\" -> :nope\n 12.34 -> :nope \n }\n "
:start 20
:type :match}
:type :match}
:value "foo"})
)
(deftest "string patterns work as expected"
(test (run `let "I {verb} the {noun}" = "I am the walrus"; (verb, noun)`) ["am" "walrus"])
(test (run `let "a {b} c {d}" = "a because I love you c yourself out the door"; (b, d)`)
["because I love you"
"yourself out the door"])
)
(deftest "lambdas may be defined and called"
(test (run `
let foo = fn () -> :foo
foo ()
`)
:foo)
(test (run `
let pair = fn (x, y) -> (x, y)
pair (:foo, :bar)
`)
[:foo :bar])
(test-error (run `
let foo = fn () -> :foo
foo (:bar)
`)
{:called @{:^type :fn
:body [[{:data @[]
:token {:input :test
:lexeme "("
:line 1
:source " let foo = fn () -> :foo\n foo (:bar)\n "
:start 15
:type :lparen}
:type :tuple}
nil
{:data :foo
:token {:input :test
:lexeme ":foo"
:line 1
:literal :foo
:source " let foo = fn () -> :foo\n foo (:bar)\n "
:start 21
:type :keyword}
:type :keyword}]]
:ctx @{}
:match @match-fn}
:msg "no match: function call"
:node {:data "foo"
:token {:input :test
:lexeme "foo"
:line 2
:literal :none
:source " let foo = fn () -> :foo\n foo (:bar)\n "
:start 28
:type :word}
:type :word}
:value [:bar]})
)