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from decimal import Decimal
import pytest
import parse
def assert_match(parser, text, param_name, expected):
result = parser.parse(text)
assert result[param_name] == expected
def assert_mismatch(parser, text, param_name):
result = parser.parse(text)
assert result is None
def assert_fixed_match(parser, text, expected):
result = parser.parse(text)
assert result.fixed == expected
def assert_fixed_mismatch(parser, text):
result = parser.parse(text)
assert result is None
def test_pattern_should_be_used():
def parse_number(text):
return int(text)
parse_number.pattern = r"\d+"
parse_number.name = "Number" # For testing only.
extra_types = {parse_number.name: parse_number}
format = "Value is {number:Number} and..."
parser = parse.Parser(format, extra_types)
assert_match(parser, "Value is 42 and...", "number", 42)
assert_match(parser, "Value is 00123 and...", "number", 123)
assert_mismatch(parser, "Value is ALICE and...", "number")
assert_mismatch(parser, "Value is -123 and...", "number")
def test_pattern_should_be_used2():
def parse_yesno(text):
return parse_yesno.mapping[text.lower()]
parse_yesno.mapping = {
"yes": True,
"no": False,
"on": True,
"off": False,
"true": True,
"false": False,
}
parse_yesno.pattern = r"|".join(parse_yesno.mapping.keys())
parse_yesno.name = "YesNo" # For testing only.
extra_types = {parse_yesno.name: parse_yesno}
format = "Answer: {answer:YesNo}"
parser = parse.Parser(format, extra_types)
# -- ENSURE: Known enum values are correctly extracted.
for value_name, value in parse_yesno.mapping.items():
text = "Answer: %s" % value_name
assert_match(parser, text, "answer", value)
# -- IGNORE-CASE: In parsing, calls type converter function !!!
assert_match(parser, "Answer: YES", "answer", True)
assert_mismatch(parser, "Answer: __YES__", "answer")
def test_with_pattern():
ab_vals = {"a": 1, "b": 2}
@parse.with_pattern(r"[ab]")
def ab(text):
return ab_vals[text]
parser = parse.Parser("test {result:ab}", {"ab": ab})
assert_match(parser, "test a", "result", 1)
assert_match(parser, "test b", "result", 2)
assert_mismatch(parser, "test c", "result")
def test_with_pattern_and_regex_group_count():
# -- SPECIAL-CASE: Regex-grouping is used in user-defined type
# NOTE: Missing or wroung regex_group_counts cause problems
# with parsing following params.
@parse.with_pattern(r"(meter|kilometer)", regex_group_count=1)
def parse_unit(text):
return text.strip()
@parse.with_pattern(r"\d+")
def parse_number(text):
return int(text)
type_converters = {"Number": parse_number, "Unit": parse_unit}
# -- CASE: Unnamed-params (affected)
parser = parse.Parser("test {:Unit}-{:Number}", type_converters)
assert_fixed_match(parser, "test meter-10", ("meter", 10))
assert_fixed_match(parser, "test kilometer-20", ("kilometer", 20))
assert_fixed_mismatch(parser, "test liter-30")
# -- CASE: Named-params (uncritical; should not be affected)
# REASON: Named-params have additional, own grouping.
parser2 = parse.Parser("test {unit:Unit}-{value:Number}", type_converters)
assert_match(parser2, "test meter-10", "unit", "meter")
assert_match(parser2, "test meter-10", "value", 10)
assert_match(parser2, "test kilometer-20", "unit", "kilometer")
assert_match(parser2, "test kilometer-20", "value", 20)
assert_mismatch(parser2, "test liter-30", "unit")
def test_with_pattern_and_wrong_regex_group_count_raises_error():
# -- SPECIAL-CASE:
# Regex-grouping is used in user-defined type, but wrong value is provided.
@parse.with_pattern(r"(meter|kilometer)", regex_group_count=1)
def parse_unit(text):
return text.strip()
@parse.with_pattern(r"\d+")
def parse_number(text):
return int(text)
# -- CASE: Unnamed-params (affected)
BAD_REGEX_GROUP_COUNTS_AND_ERRORS = [
(None, ValueError),
(0, ValueError),
(2, IndexError),
]
for bad_regex_group_count, error_class in BAD_REGEX_GROUP_COUNTS_AND_ERRORS:
parse_unit.regex_group_count = bad_regex_group_count # -- OVERRIDE-HERE
type_converters = {"Number": parse_number, "Unit": parse_unit}
parser = parse.Parser("test {:Unit}-{:Number}", type_converters)
with pytest.raises(error_class):
parser.parse("test meter-10")
def test_with_pattern_and_regex_group_count_is_none():
# -- CORNER-CASE: Increase code-coverage.
data_values = {"a": 1, "b": 2}
@parse.with_pattern(r"[ab]")
def parse_data(text):
return data_values[text]
parse_data.regex_group_count = None # ENFORCE: None
# -- CASE: Unnamed-params
parser = parse.Parser("test {:Data}", {"Data": parse_data})
assert_fixed_match(parser, "test a", (1,))
assert_fixed_match(parser, "test b", (2,))
assert_fixed_mismatch(parser, "test c")
# -- CASE: Named-params
parser2 = parse.Parser("test {value:Data}", {"Data": parse_data})
assert_match(parser2, "test a", "value", 1)
assert_match(parser2, "test b", "value", 2)
assert_mismatch(parser2, "test c", "value")
def test_case_sensitivity():
r = parse.parse("SPAM {} SPAM", "spam spam spam")
assert r[0] == "spam"
assert parse.parse("SPAM {} SPAM", "spam spam spam", case_sensitive=True) is None
def test_decimal_value():
value = Decimal("5.5")
str_ = "test {}".format(value)
parser = parse.Parser("test {:F}")
assert parser.parse(str_)[0] == value
def test_width_str():
res = parse.parse("{:.2}{:.2}", "look")
assert res.fixed == ("lo", "ok")
res = parse.parse("{:2}{:2}", "look")
assert res.fixed == ("lo", "ok")
res = parse.parse("{:4}{}", "look at that")
assert res.fixed == ("look", " at that")
def test_width_constraints():
res = parse.parse("{:4}", "looky")
assert res.fixed == ("looky",)
res = parse.parse("{:4.4}", "looky")
assert res is None
res = parse.parse("{:4.4}", "ook")
assert res is None
res = parse.parse("{:4}{:.4}", "look at that")
assert res.fixed == ("look at ", "that")
def test_width_multi_int():
res = parse.parse("{:02d}{:02d}", "0440")
assert res.fixed == (4, 40)
res = parse.parse("{:03d}{:d}", "04404")
assert res.fixed == (44, 4)
def test_width_empty_input():
res = parse.parse("{:.2}", "")
assert res is None
res = parse.parse("{:2}", "l")
assert res is None
res = parse.parse("{:2d}", "")
assert res is None
def test_int_convert_stateless_base():
parser = parse.Parser("{:d}")
assert parser.parse("1234")[0] == 1234
assert parser.parse("0b1011")[0] == 0b1011
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