giles
0fb87e3b1c
S-expression parser, evaluator, and primitive registry in shared/sexp/. 109 unit tests covering parsing, evaluation, special forms, lambdas, closures, components (defcomp), and 60+ pure builtins. Test infrastructure: Dockerfile.unit (tier 1, fast) and Dockerfile.integration (tier 2, ffmpeg). Dev watch mode auto-reruns on file changes. Deploy gate blocks push on test failure. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
327 lines
9.6 KiB
Python
327 lines
9.6 KiB
Python
"""Tests for the s-expression evaluator."""
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import pytest
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from shared.sexp import parse, evaluate, EvalError, Symbol, Keyword, NIL
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from shared.sexp.types import Lambda, Component
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# ---------------------------------------------------------------------------
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# Helpers
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# ---------------------------------------------------------------------------
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def ev(text, env=None):
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"""Parse and evaluate a single expression."""
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return evaluate(parse(text), env)
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# ---------------------------------------------------------------------------
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# Literals and lookups
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# ---------------------------------------------------------------------------
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class TestLiterals:
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def test_int(self):
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assert ev("42") == 42
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def test_string(self):
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assert ev('"hello"') == "hello"
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def test_true(self):
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assert ev("true") is True
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def test_nil(self):
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assert ev("nil") is NIL
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def test_symbol_lookup(self):
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assert ev("x", {"x": 10}) == 10
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def test_undefined_symbol(self):
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with pytest.raises(EvalError, match="Undefined symbol"):
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ev("xyz")
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def test_keyword_evaluates_to_name(self):
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assert ev(":foo") == "foo"
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# ---------------------------------------------------------------------------
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# Arithmetic
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# ---------------------------------------------------------------------------
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class TestArithmetic:
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def test_add(self):
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assert ev("(+ 1 2 3)") == 6
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def test_sub(self):
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assert ev("(- 10 3)") == 7
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def test_negate(self):
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assert ev("(- 5)") == -5
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def test_mul(self):
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assert ev("(* 2 3 4)") == 24
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def test_div(self):
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assert ev("(/ 10 4)") == 2.5
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def test_mod(self):
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assert ev("(mod 7 3)") == 1
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def test_clamp(self):
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assert ev("(clamp 15 0 10)") == 10
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assert ev("(clamp -5 0 10)") == 0
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assert ev("(clamp 5 0 10)") == 5
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# ---------------------------------------------------------------------------
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# Comparison and predicates
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# ---------------------------------------------------------------------------
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class TestComparison:
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def test_eq(self):
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assert ev("(= 1 1)") is True
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assert ev("(= 1 2)") is False
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def test_lt_gt(self):
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assert ev("(< 1 2)") is True
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assert ev("(> 2 1)") is True
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def test_predicates(self):
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assert ev("(odd? 3)") is True
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assert ev("(even? 4)") is True
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assert ev("(zero? 0)") is True
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assert ev("(nil? nil)") is True
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assert ev('(string? "hi")') is True
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assert ev("(number? 42)") is True
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assert ev("(list? (list 1))") is True
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assert ev("(dict? {:a 1})") is True
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# ---------------------------------------------------------------------------
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# Special forms
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# ---------------------------------------------------------------------------
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class TestSpecialForms:
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def test_if_true(self):
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assert ev("(if true 1 2)") == 1
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def test_if_false(self):
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assert ev("(if false 1 2)") == 2
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def test_if_no_else(self):
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assert ev("(if false 1)") is NIL
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def test_when_true(self):
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assert ev("(when true 42)") == 42
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def test_when_false(self):
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assert ev("(when false 42)") is NIL
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def test_and_short_circuit(self):
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assert ev("(and true true 3)") == 3
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assert ev("(and true false 3)") is False
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def test_or_short_circuit(self):
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assert ev("(or false false 3)") == 3
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assert ev("(or false 2 3)") == 2
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def test_let_scheme_style(self):
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assert ev("(let ((x 10) (y 20)) (+ x y))") == 30
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def test_let_clojure_style(self):
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assert ev("(let (x 10 y 20) (+ x y))") == 30
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def test_let_sequential(self):
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assert ev("(let ((x 1) (y (+ x 1))) y)") == 2
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def test_begin(self):
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assert ev("(begin 1 2 3)") == 3
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def test_quote(self):
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result = ev("(quote (a b c))")
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assert result == [Symbol("a"), Symbol("b"), Symbol("c")]
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def test_cond_clojure(self):
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assert ev("(cond false 1 true 2 :else 3)") == 2
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def test_cond_else(self):
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assert ev("(cond false 1 false 2 :else 99)") == 99
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def test_case(self):
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assert ev('(case 2 1 "one" 2 "two" :else "other")') == "two"
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def test_thread_first(self):
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assert ev("(-> 5 (+ 3) (* 2))") == 16
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def test_define(self):
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env = {}
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ev("(define x 42)", env)
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assert env["x"] == 42
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# ---------------------------------------------------------------------------
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# Lambda
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# ---------------------------------------------------------------------------
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class TestLambda:
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def test_create_and_call(self):
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assert ev("((fn (x) (* x x)) 5)") == 25
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def test_closure(self):
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result = ev("(let ((a 10)) ((fn (x) (+ x a)) 5))")
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assert result == 15
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def test_higher_order(self):
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result = ev("(let ((double (fn (x) (* x 2)))) (double 7))")
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assert result == 14
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# ---------------------------------------------------------------------------
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# Collections
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# ---------------------------------------------------------------------------
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class TestCollections:
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def test_list_constructor(self):
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assert ev("(list 1 2 3)") == [1, 2, 3]
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def test_dict_constructor(self):
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assert ev("(dict :a 1 :b 2)") == {"a": 1, "b": 2}
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def test_get_dict(self):
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assert ev('(get {:a 1 :b 2} "a")') == 1
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def test_get_list(self):
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assert ev("(get (list 10 20 30) 1)") == 20
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def test_first_last_rest(self):
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assert ev("(first (list 1 2 3))") == 1
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assert ev("(last (list 1 2 3))") == 3
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assert ev("(rest (list 1 2 3))") == [2, 3]
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def test_len(self):
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assert ev("(len (list 1 2 3))") == 3
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def test_concat(self):
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assert ev("(concat (list 1 2) (list 3 4))") == [1, 2, 3, 4]
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def test_cons(self):
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assert ev("(cons 0 (list 1 2))") == [0, 1, 2]
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def test_keys_vals(self):
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assert ev("(keys {:a 1 :b 2})") == ["a", "b"]
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assert ev("(vals {:a 1 :b 2})") == [1, 2]
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def test_merge(self):
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assert ev("(merge {:a 1} {:b 2} {:a 3})") == {"a": 3, "b": 2}
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def test_assoc(self):
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assert ev('(assoc {:a 1} :b 2)') == {"a": 1, "b": 2}
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def test_dissoc(self):
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assert ev('(dissoc {:a 1 :b 2} :a)') == {"b": 2}
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def test_empty(self):
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assert ev("(empty? (list))") is True
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assert ev("(empty? (list 1))") is False
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assert ev("(empty? nil)") is True
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def test_contains(self):
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assert ev('(contains? {:a 1} "a")') is True
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assert ev("(contains? (list 1 2 3) 2)") is True
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# ---------------------------------------------------------------------------
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# Higher-order forms
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# ---------------------------------------------------------------------------
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class TestHigherOrder:
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def test_map(self):
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assert ev("(map (fn (x) (* x x)) (list 1 2 3 4))") == [1, 4, 9, 16]
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def test_map_indexed(self):
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result = ev("(map-indexed (fn (i x) (+ i x)) (list 10 20 30))")
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assert result == [10, 21, 32]
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def test_filter(self):
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assert ev("(filter (fn (x) (> x 2)) (list 1 2 3 4))") == [3, 4]
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def test_reduce(self):
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assert ev("(reduce (fn (acc x) (+ acc x)) 0 (list 1 2 3))") == 6
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def test_some(self):
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assert ev("(some (fn (x) (if (> x 3) x nil)) (list 1 2 4 5))") == 4
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def test_every(self):
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assert ev("(every? (fn (x) (> x 0)) (list 1 2 3))") is True
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assert ev("(every? (fn (x) (> x 2)) (list 1 2 3))") is False
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# ---------------------------------------------------------------------------
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# Strings
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# ---------------------------------------------------------------------------
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class TestStrings:
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def test_str(self):
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assert ev('(str "hello" " " "world")') == "hello world"
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def test_str_numbers(self):
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assert ev('(str "val=" 42)') == "val=42"
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def test_upper_lower(self):
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assert ev('(upper "hello")') == "HELLO"
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assert ev('(lower "HELLO")') == "hello"
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def test_join(self):
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assert ev('(join ", " (list "a" "b" "c"))') == "a, b, c"
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def test_split(self):
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assert ev('(split "a,b,c" ",")') == ["a", "b", "c"]
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# ---------------------------------------------------------------------------
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# defcomp
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# ---------------------------------------------------------------------------
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class TestDefcomp:
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def test_basic_component(self):
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env = {}
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ev("(defcomp ~card (&key title) title)", env)
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assert isinstance(env["~card"], Component)
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assert env["~card"].name == "card"
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def test_component_call(self):
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env = {}
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ev("(defcomp ~greeting (&key name) (str \"Hello, \" name \"!\"))", env)
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result = ev('(~greeting :name "Alice")', env)
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assert result == "Hello, Alice!"
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def test_component_with_children(self):
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env = {}
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ev("(defcomp ~wrapper (&key class &rest children) (list class children))", env)
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result = ev('(~wrapper :class "box" 1 2 3)', env)
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assert result == ["box", [1, 2, 3]]
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def test_component_missing_kwarg_is_nil(self):
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env = {}
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ev("(defcomp ~opt (&key x y) (list x y))", env)
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result = ev("(~opt :x 1)", env)
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assert result == [1, NIL]
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# ---------------------------------------------------------------------------
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# Dict literal evaluation
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# ---------------------------------------------------------------------------
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class TestDictLiteral:
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def test_dict_values_evaluated(self):
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assert ev("{:a (+ 1 2) :b (* 3 4)}") == {"a": 3, "b": 12}
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# ---------------------------------------------------------------------------
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# set!
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# ---------------------------------------------------------------------------
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class TestSetBang:
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def test_set_bang(self):
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env = {"x": 1}
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ev("(set! x 42)", env)
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assert env["x"] == 42
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