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Fix JavaScript number tokenization #1314

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Fix JavaScript number tokenization #1314

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8 changes: 4 additions & 4 deletions babel/messages/jslexer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -24,8 +24,8 @@

escapes: dict[str, str] = {'b': '\b', 'f': '\f', 'n': '\n', 'r': '\r', 't': '\t'}

name_re = re.compile(r'[\w$_][\w\d$_]*', re.UNICODE)
dotted_name_re = re.compile(r'[\w$_][\w\d$_.]*[\w\d$_.]', re.UNICODE)
name_re = re.compile(r'(?!\d)[\w$_][\w\d$_]*', re.UNICODE)
dotted_name_re = re.compile(r'(?!\d)[\w$_][\w\d$_.]*[\w\d$_.]', re.UNICODE)
division_re = re.compile(r'/=?')
regex_re = re.compile(r'/(?:[^/\\]*(?:\\.[^/\\]*)*)/[a-zA-Z]*', re.DOTALL)
line_re = re.compile(r'(\r\n|\n|\r)')
Expand All @@ -48,10 +48,10 @@ class Token(NamedTuple):
('dotted_name', dotted_name_re),
('name', name_re),
('number', re.compile(r'''(
(0x[a-fA-F0-9]+) |
(?:0|[1-9]\d*)
(\.\d+)?
([eE][-+]?\d+)? |
(0x[a-fA-F0-9]+)
([eE][-+]?\d+)?
)''', re.VERBOSE)),
('jsx_tag', re.compile(r'(?:</?[^>\s]+|/>)', re.I)), # May be mangled in `get_rules`
('operator', re.compile(r'(%s)' % '|'.join(re.escape(op) for op in operators))),
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9 changes: 9 additions & 0 deletions tests/messages/test_jslexer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,15 @@ def test_dollar_in_identifier():
assert list(jslexer.tokenize('dollar$dollar')) == [('name', 'dollar$dollar', 1)]


def test_number_literals():
assert list(jslexer.tokenize('42 3.14 1e3 0x2a')) == [
('number', '42', 1),
('number', '3.14', 1),
('number', '1e3', 1),
('number', '0x2a', 1),
]


def test_dotted_name():
assert list(jslexer.tokenize("foo.bar(quux)", dotted=True)) == [
('name', 'foo.bar', 1),
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