diff options
Diffstat (limited to 'pym/portage/dep.py')
| -rw-r--r-- | pym/portage/dep.py | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/pym/portage/dep.py b/pym/portage/dep.py index 468b997be..d1e22376e 100644 --- a/pym/portage/dep.py +++ b/pym/portage/dep.py @@ -114,6 +114,44 @@ def paren_reduce(mystr,tokenize=1): mylist = mylist + [subsec] return mylist +class paren_normalize(list): + """Take a dependency structure as returned by paren_reduce or use_reduce + and generate an equivalent structure that has no redundant lists.""" + def __init__(self, src): + self._zap_parens(src, self) + + def _zap_parens(self, src, dest, disjunction=False): + if not src: + return dest + i = iter(src) + for x in i: + if isinstance(x, basestring): + if x == '||': + x = i.next() + if len(x) == 1: + if isinstance(x[0], basestring): + dest.append(x[0]) + else: + self._zap_parens(x, dest, disjunction=disjunction) + else: + dest.append("||") + dest.append(self._zap_parens(x, [], disjunction=True)) + elif x.endswith("?"): + dest.append(x) + dest.append(self._zap_parens(i.next(), [])) + else: + dest.append(x) + else: + if disjunction: + x = self._zap_parens(x, []) + if len(x) == 1: + dest.append(x[0]) + else: + dest.append(x) + else: + self._zap_parens(x, dest) + return dest + def paren_enclose(mylist): """ Convert a list to a string with sublists enclosed with parens. |