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import pytest
from pint.compat import tokenizer
from pint.pint_eval import build_eval_tree
from pint.util import string_preprocessor
class TestPintEval:
def _test_one(self, input_text, parsed, preprocess=False):
if preprocess:
input_text = string_preprocessor(input_text)
assert build_eval_tree(tokenizer(input_text)).to_string() == parsed
@pytest.mark.parametrize(
("input_text", "parsed"),
(
("3", "3"),
("1 + 2", "(1 + 2)"),
("1 - 2", "(1 - 2)"),
("2 * 3 + 4", "((2 * 3) + 4)"), # order of operations
("2 * (3 + 4)", "(2 * (3 + 4))"), # parentheses
(
"1 + 2 * 3 ** (4 + 3 / 5)",
"(1 + (2 * (3 ** (4 + (3 / 5)))))",
), # more order of operations
(
"1 * ((3 + 4) * 5)",
"(1 * ((3 + 4) * 5))",
), # nested parentheses at beginning
("1 * (5 * (3 + 4))", "(1 * (5 * (3 + 4)))"), # nested parentheses at end
(
"1 * (5 * (3 + 4) / 6)",
"(1 * ((5 * (3 + 4)) / 6))",
), # nested parentheses in middle
("-1", "(- 1)"), # unary
("3 * -1", "(3 * (- 1))"), # unary
("3 * --1", "(3 * (- (- 1)))"), # double unary
("3 * -(2 + 4)", "(3 * (- (2 + 4)))"), # parenthetical unary
("3 * -((2 + 4))", "(3 * (- (2 + 4)))"), # parenthetical unary
# implicit op
("3 4", "(3 4)"),
# implicit op, then parentheses
("3 (2 + 4)", "(3 (2 + 4))"),
# parentheses, then implicit
("(3 ** 4 ) 5", "((3 ** 4) 5)"),
# implicit op, then exponentiation
("3 4 ** 5", "(3 (4 ** 5))"),
# implicit op, then addition
("3 4 + 5", "((3 4) + 5)"),
# power followed by implicit
("3 ** 4 5", "((3 ** 4) 5)"),
# implicit with parentheses
("3 (4 ** 5)", "(3 (4 ** 5))"),
# exponent with e
("3e-1", "3e-1"),
# multiple units with exponents
("kg ** 1 * s ** 2", "((kg ** 1) * (s ** 2))"),
# multiple units with neg exponents
("kg ** -1 * s ** -2", "((kg ** (- 1)) * (s ** (- 2)))"),
# multiple units with neg exponents
("kg^-1 * s^-2", "((kg ^ (- 1)) * (s ^ (- 2)))"),
# multiple units with neg exponents, implicit op
("kg^-1 s^-2", "((kg ^ (- 1)) (s ^ (- 2)))"),
# nested power
("2 ^ 3 ^ 2", "(2 ^ (3 ^ 2))"),
# nested power
("gram * second / meter ** 2", "((gram * second) / (meter ** 2))"),
# nested power
("gram / meter ** 2 / second", "((gram / (meter ** 2)) / second)"),
# units should behave like numbers, so we don't need a bunch of extra tests for them
# implicit op, then addition
("3 kg + 5", "((3 kg) + 5)"),
("(5 % 2) m", "((5 % 2) m)"), # mod operator
("(5 // 2) m", "((5 // 2) m)"), # floordiv operator
),
)
def test_build_eval_tree(self, input_text, parsed):
self._test_one(input_text, parsed, preprocess=False)
@pytest.mark.parametrize(
("input_text", "parsed"),
(
("3", "3"),
("1 + 2", "(1 + 2)"),
("1 - 2", "(1 - 2)"),
("2 * 3 + 4", "((2 * 3) + 4)"), # order of operations
("2 * (3 + 4)", "(2 * (3 + 4))"), # parentheses
(
"1 + 2 * 3 ** (4 + 3 / 5)",
"(1 + (2 * (3 ** (4 + (3 / 5)))))",
), # more order of operations
(
"1 * ((3 + 4) * 5)",
"(1 * ((3 + 4) * 5))",
), # nested parentheses at beginning
("1 * (5 * (3 + 4))", "(1 * (5 * (3 + 4)))"), # nested parentheses at end
(
"1 * (5 * (3 + 4) / 6)",
"(1 * ((5 * (3 + 4)) / 6))",
), # nested parentheses in middle
("-1", "(- 1)"), # unary
("3 * -1", "(3 * (- 1))"), # unary
("3 * --1", "(3 * (- (- 1)))"), # double unary
("3 * -(2 + 4)", "(3 * (- (2 + 4)))"), # parenthetical unary
("3 * -((2 + 4))", "(3 * (- (2 + 4)))"), # parenthetical unary
# implicit op
("3 4", "(3 * 4)"),
# implicit op, then parentheses
("3 (2 + 4)", "(3 * (2 + 4))"),
# parentheses, then implicit
("(3 ** 4 ) 5", "((3 ** 4) * 5)"),
# implicit op, then exponentiation
("3 4 ** 5", "(3 * (4 ** 5))"),
# implicit op, then addition
("3 4 + 5", "((3 * 4) + 5)"),
# power followed by implicit
("3 ** 4 5", "((3 ** 4) * 5)"),
# implicit with parentheses
("3 (4 ** 5)", "(3 * (4 ** 5))"),
# exponent with e
("3e-1", "3e-1"),
# multiple units with exponents
("kg ** 1 * s ** 2", "((kg ** 1) * (s ** 2))"),
# multiple units with neg exponents
("kg ** -1 * s ** -2", "((kg ** (- 1)) * (s ** (- 2)))"),
# multiple units with neg exponents
("kg^-1 * s^-2", "((kg ** (- 1)) * (s ** (- 2)))"),
# multiple units with neg exponents, implicit op
("kg^-1 s^-2", "((kg ** (- 1)) * (s ** (- 2)))"),
# nested power
("2 ^ 3 ^ 2", "(2 ** (3 ** 2))"),
# nested power
("gram * second / meter ** 2", "((gram * second) / (meter ** 2))"),
# nested power
("gram / meter ** 2 / second", "((gram / (meter ** 2)) / second)"),
# units should behave like numbers, so we don't need a bunch of extra tests for them
# implicit op, then addition
("3 kg + 5", "((3 * kg) + 5)"),
("(5 % 2) m", "((5 % 2) * m)"), # mod operator
("(5 // 2) m", "((5 // 2) * m)"), # floordiv operator
),
)
def test_preprocessed_eval_tree(self, input_text, parsed):
self._test_one(input_text, parsed, preprocess=True)
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