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Unparse infinite imaginary literals correctly. Add some more numeric tests.

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This commit is contained in:
Mark Dickinson 2010-06-30 11:45:53 +00:00
parent abe52d749c
commit cba8c10b5c
2 changed files with 20 additions and 5 deletions
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14
Demo/parser/test_unparse.py
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@ -123,6 +123,8 @@ class UnparseTestCase(ASTTestCase):
def test_unary_parens(self):
self.check_roundtrip("(-1)**7")
self.check_roundtrip("(-1.)**8")
self.check_roundtrip("(-1j)**6")
self.check_roundtrip("not True or False")
self.check_roundtrip("True or not False")
@ -132,6 +134,18 @@ class UnparseTestCase(ASTTestCase):
def test_huge_float(self):
self.check_roundtrip("1e1000")
self.check_roundtrip("-1e1000")
self.check_roundtrip("1e1000j")
self.check_roundtrip("-1e1000j")
def test_min_int(self):
self.check_roundtrip(str(-2**31))
self.check_roundtrip(str(-2**63))
def test_imaginary_literals(self):
self.check_roundtrip("7j")
self.check_roundtrip("-7j")
self.check_roundtrip("0j")
self.check_roundtrip("-0j")
def test_lambda_parentheses(self):
self.check_roundtrip("(lambda: int)()")

11
Demo/parser/unparse.py
View file

@ -6,6 +6,10 @@ import tokenize
import io
import os
# Large float and imaginary literals get turned into infinities in the AST.
# We unparse those infinities to INFSTR.
INFSTR = "1e" + repr(sys.float_info.max_10_exp + 1)
def interleave(inter, f, seq):
"""Call f on each item in seq, calling inter() in between.
"""
@ -311,11 +315,8 @@ class Unparser:
self.write(t.id)
def _Num(self, t):
if isinstance(t.n, float) and math.isinf(t.n):
# Subsitute overflowing decimal literal for AST infinity
self.write("1e" + repr(sys.float_info.max_10_exp + 1))
else:
self.write(repr(t.n))
# Substitute overflowing decimal literal for AST infinities.
self.write(repr(t.n).replace("inf", INFSTR))
def _List(self, t):
self.write("[")