diff options
| -rw-r--r-- | portato/eix/parser.py | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/portato/eix/parser.py b/portato/eix/parser.py index e89bffe..676cdd5 100644 --- a/portato/eix/parser.py +++ b/portato/eix/parser.py @@ -63,7 +63,7 @@ def vector (file, get_type, skip = False): for i in range(nelems): get_type(file, skip = True) else: - return (get_type(file) for i in range(nelems)) + return [get_type(file) for i in range(nelems)] def string (file, skip = False): nelems = number(file) @@ -84,3 +84,25 @@ def overlay (file, skip = False): string(file, skip = True) # label else: return (string(file), string(file)) + +class LazyElement (object): + def __init__ (self, get_type, file): + self.file = file + self.get_type = get_type + self._value = None + + self.pos = file.tell() + get_type(skip=True) # skip it for the moment + + @property + def value (self): + if self._value is None: + old_pos = self.file.tell() + self.file.seek(self.pos) + self._value = self.get_type(skip = False) + self.file.seek(old_pos) + + return self._value + + def __call__ (self): + return self.value |