[Python-checkins] r82386 - python/branches/py3k/Demo/parser/unparse.py
mark.dickinson
python-checkins at python.org
Wed Jun 30 11:05:47 CEST 2010
Author: mark.dickinson
Date: Wed Jun 30 11:05:47 2010
New Revision: 82386
Log:
Better solution for attribute access on integer literals.
Modified:
python/branches/py3k/Demo/parser/unparse.py
Modified: python/branches/py3k/Demo/parser/unparse.py
==============================================================================
--- python/branches/py3k/Demo/parser/unparse.py (original)
+++ python/branches/py3k/Demo/parser/unparse.py Wed Jun 30 11:05:47 2010
@@ -316,22 +316,11 @@
self.write("`")
def _Num(self, t):
- if isinstance(t.n, float):
- # A float literal should be nonnegative, and not a nan.
- # It could be an infinity, though; in that case we
- # substitute an overflowing decimal value.
- assert not math.isnan(t.n)
- assert math.copysign(1.0, t.n) > 0.0
- if math.isinf(t.n):
- self.write("1e" + repr(sys.float_info.max_10_exp + 1))
- else:
- self.write(repr(t.n))
+ 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:
- # Parenthesize integer literals to avoid turning
- # "3 .__abs__()" into "3.__abs__()".
- self.write("(")
self.write(repr(t.n))
- self.write(")")
def _List(self, t):
self.write("[")
@@ -449,6 +438,11 @@
def _Attribute(self,t):
self.dispatch(t.value)
+ # Special case: 3.__abs__() is a syntax error, so if t.value
+ # is an integer literal then we need to either parenthesize
+ # it or add an extra space to get 3 .__abs__().
+ if isinstance(t.value, ast.Num) and isinstance(t.value.n, int):
+ self.write(" ")
self.write(".")
self.write(t.attr)
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