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import csv
import io
import sys
from typing import AsyncIterator, Callable, List, Protocol, Type
import pytest
from aiocsv._parser import Parser as CParser
from aiocsv.parser import Parser as PyParser
from aiocsv.protocols import DialectLike, WithAsyncRead
class Parser(Protocol):
def __aiter__(self) -> AsyncIterator[List[str]]: ...
@property
def line_num(self) -> int: ...
PARSERS: List[Callable[[WithAsyncRead, DialectLike], Parser]] = [PyParser, CParser]
PARSER_NAMES: List[str] = ["pure_python_parser", "c_parser"]
class AsyncStringIO:
"""Simple wrapper to fulfill WithAsyncRead around a string"""
def __init__(self, data: str = "") -> None:
self.ptr = 0
self.data = data
async def read(self, size: int) -> str:
start = self.ptr
self.ptr += size
return self.data[start : self.ptr]
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_simple(parser: Type[Parser]):
data = 'abc,"def",ghi\r\n' '"j""k""l",mno,pqr\r\n' 'stu,vwx,"yz"\r\n'
csv_result = list(csv.reader(io.StringIO(data, newline="")))
custom_result = [
r async for r in parser(AsyncStringIO(data), csv.get_dialect("excel")) # type: ignore
]
assert csv_result == custom_result
assert custom_result == [
["abc", "def", "ghi"],
['j"k"l', "mno", "pqr"],
["stu", "vwx", "yz"],
]
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_escapes(parser: Type[Parser]):
data = 'ab$"c,de$\nf\r\n' '"$"",$$gh$"\r\n' '"i\nj",k$,\r\n'
csv_parser = csv.reader(io.StringIO(data, newline=""), escapechar="$", strict=True)
csv_result = list(csv_parser)
custom_result = [
r async for r in parser(AsyncStringIO(data), csv_parser.dialect) # type: ignore
]
assert csv_result == custom_result
assert custom_result == [['ab"c', "de\nf"], ['"', '$gh"'], ["i\nj", "k,"]]
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_empty(parser: Type[Parser]):
data = "\r\n a,,\r\n,\r\n "
csv_parser = csv.reader(io.StringIO(data, newline=""), skipinitialspace=True, strict=True)
csv_result = list(csv_parser)
custom_result = [
r async for r in parser(AsyncStringIO(data), csv_parser.dialect) # type: ignore
]
assert csv_result == custom_result
assert custom_result == [[], ["a", "", ""], ["", ""], [""]]
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_nonnumeric(parser: Type[Parser]):
data = '1,2\n"a",,3.14'
csv_parser = csv.reader(
io.StringIO(data, newline=""), quoting=csv.QUOTE_NONNUMERIC, strict=True
)
csv_result = list(csv_parser)
custom_result = [
r async for r in parser(AsyncStringIO(data), csv_parser.dialect) # type: ignore
]
assert csv_result == custom_result
assert custom_result == [[1.0, 2.0], ["a", "", 3.14]]
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_nonnumeric_invalid(parser: Type[Parser]):
data = "1,2\na,3.14\n"
csv_parser = csv.reader(
io.StringIO(data, newline=""), quoting=csv.QUOTE_NONNUMERIC, strict=True
)
with pytest.raises(ValueError):
list(csv_parser)
with pytest.raises(ValueError):
[r async for r in parser(AsyncStringIO(data), csv_parser.dialect)] # type: ignore
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_none_quoting(parser: Type[Parser]):
data = '1" hello,"2\na","3.14"'
csv_parser = csv.reader(io.StringIO(data, newline=""), quoting=csv.QUOTE_NONE, strict=True)
csv_result = list(csv_parser)
custom_result = [
r async for r in parser(AsyncStringIO(data), csv_parser.dialect) # type: ignore
]
assert csv_result == custom_result
assert custom_result == [['1" hello', '"2'], ['a"', '"3.14"']]
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_weird_quotes(parser: Type[Parser]):
data = 'a"b,$"cd"\r\n' '"ef"g",\r\n' '"$"""","e"$f"\r\n'
csv_parser = csv.reader(io.StringIO(data, newline=""), escapechar="$", strict=False)
csv_result = list(csv_parser)
custom_result = [
r async for r in parser(AsyncStringIO(data), csv_parser.dialect) # type: ignore
]
assert csv_result == custom_result
assert custom_result == [['a"b', '"cd"'], ['efg"', ""], ['""', 'e$f"']]
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_strict_quoting(parser: Type[Parser]):
data = '"ab"c,def\r\n'
csv_parser = csv.reader(io.StringIO(data, newline=""), strict=True)
with pytest.raises(csv.Error, match="',' expected after '\"'"):
list(csv_parser)
with pytest.raises(csv.Error, match="',' expected after '\"'"):
[r async for r in parser(AsyncStringIO(data), csv_parser.dialect)] # type: ignore
@pytest.mark.asyncio
@pytest.mark.skipif(
sys.version_info < (3, 12, 9),
reason="CPython bug gh-113785 was fixed in 3.12.9",
)
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_weird_quotes_nonnumeric(parser: Type[Parser]):
data = '3.0,\r\n"1."5,"15"\r\n$2,"-4".5\r\n-5$.2,-11'
csv_parser = csv.reader(
io.StringIO(data, newline=""),
quoting=csv.QUOTE_NONNUMERIC,
escapechar="$",
strict=False,
)
csv_result = list(csv_parser)
custom_result = [
r async for r in parser(AsyncStringIO(data), csv_parser.dialect) # type: ignore
]
assert csv_result == custom_result
assert custom_result == [[3.0, ""], ["1.5", "15"], [2.0, "-4.5"], [-5.2, -11.0]]
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_escape_after_quote_in_quoted(parser: Type[Parser]):
data = '"fo"$o\r\n'
csv_parser = csv.reader(io.StringIO(data, newline=""), escapechar="$")
csv_result = list(csv_parser)
custom_result = [
r async for r in parser(AsyncStringIO(data), csv_parser.dialect) # type: ignore
]
expected_result = [["fo$o"]]
assert csv_result == expected_result
assert custom_result == expected_result
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_escaped_crlf(parser: Type[Parser]):
data = "foo$\r\nbar\r\n"
csv_parser = csv.reader(io.StringIO(data, newline=""), escapechar="$")
csv_result = list(csv_parser)
custom_result = [
r async for r in parser(AsyncStringIO(data), csv_parser.dialect) # type: ignore
]
expected_result = [["foo\r"], ["bar"]]
assert csv_result == expected_result
assert custom_result == expected_result
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_escaped_crlf_in_quoted(parser: Type[Parser]):
data = '"foo$\r\n",bar\r\n'
csv_parser = csv.reader(io.StringIO(data, newline=""), escapechar="$")
csv_result = list(csv_parser)
custom_result = [
r async for r in parser(AsyncStringIO(data), csv_parser.dialect) # type: ignore
]
expected_result = [["foo\r\n", "bar"]]
assert csv_result == expected_result
assert custom_result == expected_result
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_consecutive_newlines(parser: Type[Parser]):
data = "foo\r\rbar\n\rbaz\n\nspam\r\n\neggs"
csv_parser = csv.reader(io.StringIO(data, newline=""), escapechar="$")
csv_result = list(csv_parser)
custom_result = [
r async for r in parser(AsyncStringIO(data), csv_parser.dialect) # type: ignore
]
expected_result = [["foo"], [], ["bar"], [], ["baz"], [], ["spam"], [], ["eggs"]]
assert csv_result == expected_result
assert custom_result == expected_result
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_line_num(parser: Type[Parser]):
data = 'foo,bar,baz\r\nspam,"egg\reggs",milk\r\n'
csv_parser = csv.reader(io.StringIO(data, newline=""))
csv_result = [(csv_parser.line_num, line) for line in csv_parser]
custom_parser = parser(AsyncStringIO(data), csv_parser.dialect) # type: ignore
custom_result = [(custom_parser.line_num, line) async for line in custom_parser]
expected_result = [
(1, ["foo", "bar", "baz"]),
(3, ["spam", "egg\reggs", "milk"]),
]
assert csv_result == expected_result
assert custom_result == expected_result
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_field_size_limit(parser: Type[Parser]):
csv.field_size_limit(64)
data = "a" * 65 + "\r\n"
csv_parser = csv.reader(io.StringIO(data, newline=""), strict=True)
with pytest.raises(csv.Error, match=r"field larger than field limit \(64\)"):
list(csv_parser)
with pytest.raises(csv.Error, match=r"field larger than field limit \(64\)"):
[r async for r in parser(AsyncStringIO(data), csv_parser.dialect)] # type: ignore
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_unterminated_quote(parser: Type[Parser]):
data = '"abc\r\n'
csv_parser = csv.reader(io.StringIO(data, newline=""), strict=True)
with pytest.raises(csv.Error, match=r"unexpected end of data"):
list(csv_parser)
with pytest.raises(csv.Error, match=r"unexpected end of data"):
[r async for r in parser(AsyncStringIO(data), csv_parser.dialect)] # type: ignore
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_unterminated_quote_non_strict(parser: Type[Parser]):
data = '"abc\r\n'
csv_parser = csv.reader(io.StringIO(data, newline=""), strict=False)
csv_result = list(csv_parser)
custom_parser = parser(AsyncStringIO(data), csv_parser.dialect) # type: ignore
custom_result = [line async for line in custom_parser]
expected_result = [["abc\r\n"]]
assert csv_result == expected_result
assert custom_result == expected_result
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_eof_in_escape(parser: Type[Parser]):
data = "a$"
csv_parser = csv.reader(io.StringIO(data, newline=""), escapechar="$", strict=True)
with pytest.raises(csv.Error, match=r"unexpected end of data"):
list(csv_parser)
with pytest.raises(csv.Error, match=r"unexpected end of data"):
[r async for r in parser(AsyncStringIO(data), csv_parser.dialect)] # type: ignore
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_eof_in_escape_non_strict(parser: Type[Parser]):
data = "a$"
csv_parser = csv.reader(io.StringIO(data, newline=""), escapechar="$", strict=False)
csv_result = list(csv_parser)
custom_parser = parser(AsyncStringIO(data), csv_parser.dialect) # type: ignore
custom_result = [line async for line in custom_parser]
expected_result = [["a\n"]]
assert csv_result == expected_result
assert custom_result == expected_result
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_eof_in_quoted_escape(parser: Type[Parser]):
data = '"a$'
csv_parser = csv.reader(io.StringIO(data, newline=""), escapechar="$", strict=True)
with pytest.raises(csv.Error, match=r"unexpected end of data"):
list(csv_parser)
with pytest.raises(csv.Error, match=r"unexpected end of data"):
[r async for r in parser(AsyncStringIO(data), csv_parser.dialect)] # type: ignore
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_eof_in_quoted_escape_non_strict(parser: Type[Parser]):
data = '"a$'
csv_parser = csv.reader(io.StringIO(data, newline=""), escapechar="$", strict=False)
csv_result = list(csv_parser)
custom_parser = parser(AsyncStringIO(data), csv_parser.dialect) # type: ignore
custom_result = [line async for line in custom_parser]
expected_result = [["a\n"]]
assert csv_result == expected_result
assert custom_result == expected_result
@pytest.mark.asyncio
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_no_newline_at_the_end(parser: Type[Parser]):
data = "pi,3.1416\r\nsqrt2,1.4142\r\nphi,1.618\r\ne,2.7183"
csv_result = list(csv.reader(io.StringIO(data, newline="")))
custom_result = [
r async for r in parser(AsyncStringIO(data), csv.get_dialect("excel")) # type: ignore
]
assert csv_result == custom_result
assert custom_result == [
["pi", "3.1416"],
["sqrt2", "1.4142"],
["phi", "1.618"],
["e", "2.7183"],
]
@pytest.mark.asyncio
@pytest.mark.skipif(sys.version_info < (3, 12), reason="csv.QUOTE_STRINGS was added in 3.12")
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_quote_strings(parser: Type[Parser]):
data = '3.14,,"abc",""\r\n'
csv_parser = csv.reader(io.StringIO(data, newline=""), quoting=csv.QUOTE_STRINGS, strict=True) # type: ignore
csv_result = list(csv_parser)
custom_result = [
r async for r in parser(AsyncStringIO(data), csv_parser.dialect) # type: ignore
]
if sys.version_info < (3, 13):
# https://github.com/python/cpython/issues/113732
assert csv_result == [["3.14", "", "abc", ""]]
else:
assert csv_result == [[3.14, None, "abc", ""]]
assert custom_result == [[3.14, None, "abc", ""]]
@pytest.mark.asyncio
@pytest.mark.skipif(sys.version_info < (3, 12), reason="csv.QUOTE_STRINGS was added in 3.12")
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_quote_strings_non_float(parser: Type[Parser]):
data = "abc"
csv_parser = csv.reader(io.StringIO(data, newline=""), quoting=csv.QUOTE_STRINGS, strict=True) # type: ignore
if sys.version_info < (3, 13):
# https://github.com/python/cpython/issues/113732
assert list(csv_parser) == [["abc"]]
else:
with pytest.raises(ValueError):
list(csv_parser)
with pytest.raises(ValueError):
[r async for r in parser(AsyncStringIO(data), csv_parser.dialect)] # type: ignore
@pytest.mark.asyncio
@pytest.mark.skipif(sys.version_info < (3, 12), reason="csv.QUOTE_NOTNULL was added in 3.12")
@pytest.mark.parametrize("parser", PARSERS, ids=PARSER_NAMES)
async def test_parsing_quote_not_null(parser: Type[Parser]):
data = '3.14,,abc,""\r\n'
csv_parser = csv.reader(io.StringIO(data, newline=""), quoting=csv.QUOTE_NOTNULL, strict=True) # type: ignore
csv_result = list(csv_parser)
custom_result = [
r async for r in parser(AsyncStringIO(data), csv_parser.dialect) # type: ignore
]
if sys.version_info < (3, 13):
# https://github.com/python/cpython/issues/113732
assert csv_result == [["3.14", "", "abc", ""]]
else:
assert csv_result == [["3.14", None, "abc", ""]]
assert custom_result == [["3.14", None, "abc", ""]]
|
