def _check_errors(source: str, enviroment: Environment) -> str:
source = _clean_comments(source)
lexer: Lexer = Lexer(source)
parser: Parser = Parser(lexer)
program: Program = parser.parse_program()
env: Environment = enviroment
if len(parser.errors) > 0:
_print_parse_errors(parser.errors)
return ''
try:
evaluated = evaluate(program, env)
if evaluated is not None:
print(evaluated.inspect())
return ''
except RecursionError:
print('[Error] ' + _MAXIMUMRECURSIONDEPTH.format(''))
except AssertionError:
print('\n[Error] ' + _EVALUATIONERROR.format('') + '\n')
return source
def test_if_expression(self) -> None:
source: str = 'if x > y then {z}'
lexer: Lexer = Lexer(source)
parser: Parser = Parser(lexer)
program: Program = parser.parse_program()
self._test_program_statements(parser, program)
# Test correct node type
if_expression = cast(If, cast(ExpressionStatement,
program.statements[0]).expression)
self.assertIsInstance(if_expression, If)
# Test condition
assert if_expression.condition is not None
self._test_infix_expression(if_expression.condition, 'x', '>', 'y')
assert if_expression.consequence is not None
self.assertIsInstance(if_expression.consequence, Block)
self.assertEquals(len(if_expression.consequence.statements), 1)
consequence_statement = cast(
ExpressionStatement, if_expression.consequence.statements[0])
assert consequence_statement.expression is not None
self._test_identifier(consequence_statement.expression, 'z')
# Test alternative
self.assertIsNone(if_expression.alternative)
def test_parse_errors(self) -> None:
source: str = 'let x 5;'
lexer: Lexer = Lexer(source)
parser: Parser = Parser(lexer)
program: Program = parser.parse_program()
self.assertEquals(len(parser.errors), 1)
def test_parser_program(self) -> None:
source: str = 'let x = 5;'
lexer: Lexer = Lexer(source)
parser: Parser = Parser(lexer)
program: Program = parser.parse_program()
self.assertIsNotNone(program)
self.assertIsInstance(program, Program)
def _evaluate_tests(self, source: str) -> Object:
lexer: Lexer = Lexer(source)
parser: Parser = Parser(lexer)
program: Program = parser.parse_program()
env: Environment = Environment()
evaluated = evaluate(program, env)
assert evaluated is not None
return evaluated
def _test_interger_expression(self) -> None:
source: str = '5;'
lexer: Lexer = Lexer(source)
parser: Parser = Parser(lexer)
program: Program = parser.parse_program()
self._test_program_statements(parser, program)
expression_statement = cast(ExpressionStatement, program.statements[0])
assert expression_statement.expression is not None
self._test_literal_expression(expression_statement.expression, 5)
def test_return_statement(self) -> None:
source: str = '''
=> 5;
=> "Hello, World";
'''
lexer: Lexer = Lexer(source)
parser: Parser = Parser(lexer)
program: Program = parser.parse_program()
self.assertEquals(len(program.statements), 2)
for statement in program.statements:
self.assertEquals(statement.token_literal(), '=>')
self.assertIsInstance(statement, ReturnStatement)
def test_infix_statements(self) -> None:
source: str = '''
5 + 5;
5 - 5;
5 * 5;
5 / 5;
5 % 5;
5 > 5;
5 >= 5;
5 < 5;
5 <= 5;
5 == 5;
5 != 5;
true == true;
true != false;
'''
lexer = Lexer(source)
parser: Parser = Parser(lexer)
program: Program = parser.parse_program()
self._test_program_statements(
parser, program, expected_statement_count=13)
expected_operators_and_values: List[Tuple[Any, str, Any]] = [
(5, '+', 5),
(5, '-', 5),
(5, '*', 5),
(5, '/', 5),
(5, '%', 5),
(5, '>', 5),
(5, '>=', 5),
(5, '<', 5),
(5, '<=', 5),
(5, '==', 5),
(5, '!=', 5),
(True, '==', True),
(True, '!=', False),
]
for statement, (expected_left, expected_operator, expected_right) in zip(
program.statements, expected_operators_and_values):
statement = cast(ExpressionStatement, statement)
assert statement.expression is not None
self.assertIsInstance(statement.expression, Infix)
self._test_infix_expression(statement.expression,
expected_left,
expected_operator,
expected_right)
def test_let_statements(self) -> None:
source: str = '''
let x = 5 ;
let y = 10;
let foo = 20;
let float_val = 3.14159;
let string_val = "This is a string;"
'''
lexer: Lexer = Lexer(source)
parser: Parser = Parser(lexer)
program: Program = parser.parse_program()
self.assertEqual(len(program.statements), 5)
for statement in program.statements:
self.assertEqual(statement.token_literal(), 'let')
self.assertIsInstance(statement, LetStatement)
def test_tuple_and_list(self) -> None:
tests: List[Tuple[str, List[List[int]]]] = [
('[(1,2)]', [[1, 2]]),
('[(1,2), (2,3)]', [[1, 2], [2, 3]]),
]
for source, expected in tests:
lexer: Lexer = Lexer(source)
parser: Parser = Parser(lexer)
program: Program = parser.parse_program()
list_values = cast(ListValues, cast(ExpressionStatement,
program.statements[0]).expression)
self.assertIsNotNone(list_values)
for items, expects in zip(list_values.values, expected):
for item, expect in zip(items.values, expects):
self.assertEquals(item.value, expect)
def _test_prefix_expression(self) -> None:
source: str = '-15;'
lexer: Lexer = Lexer(source)
parser: Parser = Parser(lexer)
program: Program = parser.parse_program()
self._test_program_statements(
parser, program, expected_statement_count=1)
for statement, (expected_operator, expected_value) in zip(
program.statements, [('-', 15)]):
statement = cast(ExpressionStatement, statement)
self.assertIsInstance(statement.expression, Prefix)
prefix = cast(Prefix, statement.expression)
self.assertEquals(prefix.operator, expected_operator)
assert prefix.right is not None
self._test_literal_expression(prefix.right, expected_value)
def test_names_in_let_statements(self) -> None:
source: str = '''
let x = 5 ;
let y = 10 ;
let foo = 20 ;
'''
lexer: Lexer = Lexer(source)
parser: Parser = Parser(lexer)
program: Program = parser.parse_program()
names: List[str] = []
for statement in program.statements:
statement = cast(LetStatement, statement)
assert statement.name is not None
names.append(statement.name.value)
expected_names: List[str] = ['x', 'y', 'foo']
self.assertEquals(names, expected_names)
def test_call_list(self) -> None:
source: str = 'value_list[1, 2 * 3];'
lexer: Lexer = Lexer(source)
parser: Parser = Parser(lexer)
program: Program = parser.parse_program()
self._test_program_statements(parser, program)
call_list = cast(CallList, cast(ExpressionStatement,
program.statements[0]).expression)
self.assertIsInstance(call_list, CallList)
self._test_identifier(call_list.list_identifier, 'value_list')
# Test arguments
assert call_list.range is not None
self.assertEquals(len(call_list.range), 2)
self._test_literal_expression(call_list.range[0], 1)
self._test_infix_expression(call_list.range[1], 2, '*', 3)
def test_tuple(self) -> None:
tests: List[Tuple[str, List[int]]] = [
('(1,2);', [1, 2]),
('(1,2,3);', [1, 2, 3]),
('(1,1,2,3,5);', [1, 1, 2, 3, 5]),
('(2,3,5,7,11);', [2, 3, 5, 7, 11])
]
for source, expected in tests:
lexer: Lexer = Lexer(source)
parser: Parser = Parser(lexer)
program: Program = parser.parse_program()
tuple_values = cast(TupleValues, cast(ExpressionStatement,
program.statements[0]).expression)
self.assertIsNotNone(tuple_values)
for item, expect in zip(tuple_values.values, expected):
self.assertEquals(item.value, expect)
def process(lexer: Lexer, env: Environment):
parser: Parser = Parser(lexer)
program: Program = parser.parse_program()
if len(parser.errors) > 0:
_print_parse_errors(parser.errors)
try:
evaluated = evaluate(program, env)
if evaluated is not None and evaluated.type() is not ObjectType.ERROR:
print(evaluated.inspect())
return evaluated
except RecursionError:
print('\n[Error] ' + _MAXIMUMRECURSIONDEPTH.format('') + '\n')
except AssertionError:
print('\n[Error] ' + _EVALUATIONERROR.format('') + '\n')
def test_function_parameters(self) -> None:
tests = [
{'input': 'fn x::int -> int {1}',
'expected_params': ['x'],
'expected_type_params': ['int'],
'expected_type_output': 'int'
},
{'input': 'fn x::int, y::int -> int {1}',
'expected_params': ['x', 'y'],
'expected_type_params': ['int', 'int'],
'expected_type_output': 'int'
},
{'input': 'fn x::int, y::int, z::int -> int {1}',
'expected_params': ['x', 'y', 'z'],
'expected_type_params': ['int', 'int', 'int'],
'expected_type_output': 'int'
},
]
for test in tests:
lexer: Lexer = Lexer(str(test['input']))
parser: Parser = Parser(lexer)
program: Program = parser.parse_program()
function = cast(Function, cast(
ExpressionStatement, program.statements[0]).expression)
self.assertEquals(len(function.parameters),
len(test['expected_params']))
for idx, param in enumerate(test['expected_params']):
self._test_literal_expression(function.parameters[idx], param)
for idx, type_param in enumerate(test['expected_type_params']):
self._test_literal_expression(
function.type_parameters[idx], type_param)
assert function.type_output is not None
self.assertEquals(function.type_output.value,
test['expected_type_output'])
def test_call_expression(self) -> None:
source: str = 'sum(1, 2 * 3, 4 + 5);'
lexer: Lexer = Lexer(source)
parser: Parser = Parser(lexer)
program: Program = parser.parse_program()
self._test_program_statements(parser, program)
call = cast(Call, cast(ExpressionStatement,
program.statements[0]).expression)
self.assertIsInstance(call, Call)
self._test_identifier(call.function, 'sum')
# Test arguments
assert call.arguments is not None
self.assertEquals(len(call.arguments), 3)
self._test_literal_expression(call.arguments[0], 1)
self._test_infix_expression(call.arguments[1], 2, '*', 3)
self._test_infix_expression(call.arguments[2], 4, '+', 5)
def test_boolean_expression(self) -> None:
source: str = '''
true;
false;
'''
lexer = Lexer(source)
parser: Parser = Parser(lexer)
program: Program = parser.parse_program()
self._test_program_statements(
parser, program, expected_statement_count=2)
expected_values: List[bool] = [True, False]
for statement, expected_value in zip(program.statements, expected_values):
expression_statement = cast(ExpressionStatement, statement)
assert expression_statement.expression is not None
self._test_literal_expression(expression_statement.expression,
expected_value)
def test_operator_precedence(self) -> None:
test_sources: List[Tuple[str, str, int]] = [
('-a * b;', '((-a) * b)', 1),
('a + b / c;', '(a + (b / c))', 1),
('3 + 4; -5 * 5;', '(3 + 4)((-5) * 5)', 2),
('2 * 3 / 5 * -6 % 7;', '((((2 * 3) / 5) * (-6)) % 7)', 1),
('-3 ** 2;', '((-3) ** 2)', 1),
('2 * 4 / 5 ** 7;', '((2 * 4) / (5 ** 7))', 1),
('-1 + 2 % -3 + 345354**4;', '(((-1) + (2 % (-3))) + (345354 ** 4))', 1),
('-4 + 6 * 5; 45 / 6 * 8 - -1;',
'((-4) + (6 * 5))(((45 / 6) * 8) - (-1))', 2),
('a + 4 - 5 + -3 + -b;', '((((a + 4) - 5) + (-3)) + (-b))', 1),
('a ** 4 + 5 - -46 ** 6;', '(((a ** 4) + 5) - ((-46) ** 6))', 1),
('a ** 5 % 3 / 2;', '(((a ** 5) % 3) / 2)', 1),
('-5 * 45 ** 5 - 15 % 2;', '(((-5) * (45 ** 5)) - (15 % 2))', 1),
('34 ** 3 / 7 % 45 + -102', '((((34 ** 3) / 7) % 45) + (-102))', 1),
('3 ** (4 % 7) + 23 * -21', '((3 ** (4 % 7)) + (23 * (-21)))', 1),
('5 >= 34 == 4 < 2 == (a == a)',
'(((5 >= 34) == (4 < 2)) == (a == a))', 1),
('a + sum(b * c) + d;', '((a + sum((b * c))) + d)', 1),
('sum(a, b, 1, 2 * 3, 4 + 5, sum(6, 7 * 8));',
'sum(a, b, 1, (2 * 3), (4 + 5), sum(6, (7 * 8)))', 1),
('4 % 2 == 0 && 2 > 0;', '(((4 % 2) == 0) && (2 > 0))', 1),
('-4 + 2 == 0 || 2 > 0;', '((((-4) + 2) == 0) || (2 > 0))', 1)
# ('-function(-something, other_thing ** 23) ** (-34 % 90);',
# '((-function((-something), (other_thing ** 23))) ** ((-34) % 90))', 1),
]
for source, expected_result, expected_statement_count in test_sources:
lexer: Lexer = Lexer(source)
parser: Parser = Parser(lexer)
program: Program = parser.parse_program()
self._test_program_statements(
parser, program, expected_statement_count)
self.assertEquals(str(program), expected_result)
def _test_function_literal(self) -> None:
source: str = 'fn x::int, y::int -> int {=> x + y}'
lexer: Lexer = Lexer(source)
parser: Parser = Parser(lexer)
program: Program = parser.parse_program()
self._test_program_statements(parser, program)
# Test correct node type
function_literal = cast(Function, cast(ExpressionStatement,
program.statements[0]).expression)
self.assertIsInstance(function_literal, Function)
# Test params
self.assertEquals(len(function_literal.parameters), 2)
self._test_literal_expression(function_literal.parameters[0], 'x')
self._test_literal_expression(function_literal.parameters[1], 'y')
self._test_literal_expression(
function_literal.type_parameters[0], 'int')
self._test_literal_expression(
function_literal.type_parameters[1], 'int')
# Test output
assert function_literal.type_output is not None
self.assertEquals(function_literal.type_output, 'int')
# Test body
assert function_literal.body is not None
self.assertEquals(len(function_literal.body.statements), 1)
body = cast(ExpressionStatement, function_literal.body.statements[0])
assert body.expression is not None
self._test_infix_expression(body.expression, 'x', '+', 'y')