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"""Tests for the blib2to3 tokenizer.""" | ||
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import io | ||
import sys | ||
import textwrap | ||
from dataclasses import dataclass | ||
from typing import List | ||
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import black | ||
from blib2to3.pgen2 import token, tokenize | ||
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@dataclass | ||
class Token: | ||
type: str | ||
string: str | ||
start: tokenize.Coord | ||
end: tokenize.Coord | ||
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def get_tokens(text: str) -> List[Token]: | ||
"""Return the tokens produced by the tokenizer.""" | ||
readline = io.StringIO(text).readline | ||
tokens: List[Token] = [] | ||
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def tokeneater( | ||
type: int, string: str, start: tokenize.Coord, end: tokenize.Coord, line: str | ||
) -> None: | ||
tokens.append(Token(token.tok_name[type], string, start, end)) | ||
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tokenize.tokenize(readline, tokeneater) | ||
return tokens | ||
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def assert_tokenizes(text: str, tokens: List[Token]) -> None: | ||
"""Assert that the tokenizer produces the expected tokens.""" | ||
actual_tokens = get_tokens(text) | ||
assert actual_tokens == tokens | ||
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def test_simple() -> None: | ||
assert_tokenizes( | ||
"1", | ||
[Token("NUMBER", "1", (1, 0), (1, 1)), Token("ENDMARKER", "", (2, 0), (2, 0))], | ||
) | ||
assert_tokenizes( | ||
"'a'", | ||
[ | ||
Token("STRING", "'a'", (1, 0), (1, 3)), | ||
Token("ENDMARKER", "", (2, 0), (2, 0)), | ||
], | ||
) | ||
assert_tokenizes( | ||
"a", | ||
[Token("NAME", "a", (1, 0), (1, 1)), Token("ENDMARKER", "", (2, 0), (2, 0))], | ||
) | ||
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def test_fstring() -> None: | ||
assert_tokenizes( | ||
'f"x"', | ||
[ | ||
Token("FSTRING_START", 'f"', (1, 0), (1, 2)), | ||
Token("FSTRING_MIDDLE", "x", (1, 2), (1, 3)), | ||
Token("FSTRING_END", '"', (1, 3), (1, 4)), | ||
Token("ENDMARKER", "", (2, 0), (2, 0)), | ||
], | ||
) | ||
assert_tokenizes( | ||
'f"{x}"', | ||
[ | ||
Token("FSTRING_START", 'f"', (1, 0), (1, 2)), | ||
Token("FSTRING_MIDDLE", "", (1, 2), (1, 2)), | ||
Token("LBRACE", "{", (1, 2), (1, 3)), | ||
Token("NAME", "x", (1, 3), (1, 4)), | ||
Token("RBRACE", "}", (1, 4), (1, 5)), | ||
Token("FSTRING_MIDDLE", "", (1, 5), (1, 5)), | ||
Token("FSTRING_END", '"', (1, 5), (1, 6)), | ||
Token("ENDMARKER", "", (2, 0), (2, 0)), | ||
], | ||
) | ||
assert_tokenizes( | ||
'f"{x:y}"\n', | ||
[ | ||
Token(type="FSTRING_START", string='f"', start=(1, 0), end=(1, 2)), | ||
Token(type="FSTRING_MIDDLE", string="", start=(1, 2), end=(1, 2)), | ||
Token(type="LBRACE", string="{", start=(1, 2), end=(1, 3)), | ||
Token(type="NAME", string="x", start=(1, 3), end=(1, 4)), | ||
Token(type="OP", string=":", start=(1, 4), end=(1, 5)), | ||
Token(type="FSTRING_MIDDLE", string="y", start=(1, 5), end=(1, 6)), | ||
Token(type="RBRACE", string="}", start=(1, 6), end=(1, 7)), | ||
Token(type="FSTRING_MIDDLE", string="", start=(1, 7), end=(1, 7)), | ||
Token(type="FSTRING_END", string='"', start=(1, 7), end=(1, 8)), | ||
Token(type="NEWLINE", string="\n", start=(1, 8), end=(1, 9)), | ||
Token(type="ENDMARKER", string="", start=(2, 0), end=(2, 0)), | ||
], | ||
) | ||
assert_tokenizes( | ||
'f"x\\\n{a}"\n', | ||
[ | ||
Token(type="FSTRING_START", string='f"', start=(1, 0), end=(1, 2)), | ||
Token(type="FSTRING_MIDDLE", string="x\\\n", start=(1, 2), end=(2, 0)), | ||
Token(type="LBRACE", string="{", start=(2, 0), end=(2, 1)), | ||
Token(type="NAME", string="a", start=(2, 1), end=(2, 2)), | ||
Token(type="RBRACE", string="}", start=(2, 2), end=(2, 3)), | ||
Token(type="FSTRING_MIDDLE", string="", start=(2, 3), end=(2, 3)), | ||
Token(type="FSTRING_END", string='"', start=(2, 3), end=(2, 4)), | ||
Token(type="NEWLINE", string="\n", start=(2, 4), end=(2, 5)), | ||
Token(type="ENDMARKER", string="", start=(3, 0), end=(3, 0)), | ||
], | ||
) | ||
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# Run "echo some code | python tests/test_tokenize.py" to generate test cases. | ||
if __name__ == "__main__": | ||
code = sys.stdin.read() | ||
tokens = get_tokens(code) | ||
text = f"assert_tokenizes({code!r}, {tokens!r})" | ||
text = black.format_str(text, mode=black.Mode()) | ||
print(textwrap.indent(text, " ")) |