unbundle20: move header parsing into the 'getunbundler' function
The dispatching will be based on the header content, so we need to move this
logic into the factory function.
"""Fixer that changes bytes % whatever to a function that actually formats
it."""
from lib2to3 import fixer_base
from lib2to3.fixer_util import is_tuple, Call, Comma, Name, touch_import
# XXX: Implementing a blacklist in 2to3 turned out to be more troublesome than
# blacklisting some modules inside the fixers. So, this is what I came with.
blacklist = ['mercurial/demandimport.py',
'mercurial/py3kcompat.py',
'mercurial/i18n.py',
]
def isnumberremainder(formatstr, data):
try:
if data.value.isdigit():
return True
except AttributeError:
return False
class FixBytesmod(fixer_base.BaseFix):
# XXX: There's one case (I suppose) I can't handle: when a remainder
# operation like foo % bar is performed, I can't really know what the
# contents of foo and bar are. I believe the best approach is to "correct"
# the to-be-converted code and let bytesformatter handle that case in
# runtime.
PATTERN = '''
term< formatstr=STRING '%' data=STRING > |
term< formatstr=STRING '%' data=atom > |
term< formatstr=NAME '%' data=any > |
term< formatstr=any '%' data=any >
'''
def transform(self, node, results):
for bfn in blacklist:
if self.filename.endswith(bfn):
return
if not self.filename.endswith('mercurial/py3kcompat.py'):
touch_import('mercurial', 'py3kcompat', node=node)
formatstr = results['formatstr'].clone()
data = results['data'].clone()
formatstr.prefix = '' # remove spaces from start
if isnumberremainder(formatstr, data):
return
# We have two possibilities:
# 1- An identifier or name is passed, it is going to be a leaf, thus, we
# just need to copy its value as an argument to the formatter;
# 2- A tuple is explicitly passed. In this case, we're gonna explode it
# to pass to the formatter
# TODO: Check for normal strings. They don't need to be translated
if is_tuple(data):
args = [formatstr, Comma().clone()] + \
[c.clone() for c in data.children[:]]
else:
args = [formatstr, Comma().clone(), data]
call = Call(Name('bytesformatter', prefix=' '), args)
return call