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"""Miscellaneous stuff for Coverage."""
def nice_pair(pair):
"""Make a nice string representation of a pair of numbers.
If the numbers are equal, just return the number, otherwise return the pair
with a dash between them, indicating the range.
"""
start, end = pair
if start == end:
return "%d" % start
else:
return "%d-%d" % (start, end)
def format_lines(statements, lines):
"""Nicely format a list of line numbers.
Format a list of line numbers for printing by coalescing groups of lines as
long as the lines represent consecutive statements. This will coalesce
even if there are gaps between statements.
For example, if `statements` is [1,2,3,4,5,10,11,12,13,14] and
`lines` is [1,2,5,10,11,13,14] then the result will be "1-2, 5-11, 13-14".
"""
pairs = []
i = 0
j = 0
start = None
while i < len(statements) and j < len(lines):
if statements[i] == lines[j]:
if start == None:
start = lines[j]
end = lines[j]
j += 1
elif start:
pairs.append((start, end))
start = None
i += 1
if start:
pairs.append((start, end))
ret = ', '.join(map(nice_pair, pairs))
return ret
def expensive(fn):
"""A decorator to cache the result of an expensive operation.
Only applies to methods with no arguments.
"""
attr = "_cache_" + fn.__name__
def _wrapped(self):
"""Inner fn that checks the cache."""
if not hasattr(self, attr):
setattr(self, attr, fn(self))
return getattr(self, attr)
return _wrapped
def bool_or_none(b):
"""Return bool(b), but preserve None."""
if b is None:
return None
else:
return bool(b)
class CoverageException(Exception):
"""An exception specific to Coverage."""
pass
class NoSource(CoverageException):
"""Used to indicate we couldn't find the source for a module."""
pass
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