def test_evaluate_single_expression():
ast = parse(tokenize('(add 1 2)'))
result = evl(ast, ctx)
assert result == 3
def test_eval_set_variable_string():
ast = parse(tokenize('(set user-name "evren")'))
result = evl(ast, ctx)
assert ctx['user-name'] == "evren"
def test_eval_set_variable_number():
ast = parse(tokenize('(set user-id 1546)'))
result = evl(ast, ctx)
assert ctx['user-id'] == 1546
def test_eval_list():
ast = parse(tokenize("'(1 2 3)"))
result = evl(ast, ctx)
assert result == [1, 2, 3]
def test_eval_list_functions():
ast = parse(tokenize("(avg '(1 2 3))"))
result = evl(ast, ctx)
assert result == 2.0
def test_if_false():
ast = parse(tokenize('(if (= 5 1) TRUE FALSE)'))
result = evl(ast, ctx)
assert result == 'FALSE'
def test_if_true():
ast = parse(tokenize('(if (= 1 1) TRUE FALSE)'))
result = evl(ast, ctx)
assert result == 'TRUE'
def test_define_function_in_local_scope():
ast = parse(tokenize('(defun double (params x) (mul x 2))'))
context = {}
result = evl(ast, context)
assert 'double' in context
def test_evaluate_list_of_expressions_return_last_one():
ast = parse(tokenize('(add 1 2) (mul 9 8)'))
result = evl(ast, ctx)
assert result == 72
def run(expr, context=ctx):
return evl(parse(tokenize(expr)), context)