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repr.py
"""Redo the builtin repr() (representation) but with limits on most sizes.""" __all__ = ["Repr","repr"] import __builtin__ from itertools import islice class Repr: def __init__(self): self.maxlevel = 6 self.maxtuple = 6 self.maxlist = 6 self.maxarray = 5 self.maxdict = 4 self.maxset = 6 self.maxfrozenset = 6 self.maxdeque = 6 self.maxstring = 30 self.maxlong = 40 self.maxother = 20 def repr(self, x): return self.repr1(x, self.maxlevel) def repr1(self, x, level): typename = type(x).__name__ if ' ' in typename: parts = typename.split() typename = '_'.join(parts) if hasattr(self, 'repr_' + typename): return getattr(self, 'repr_' + typename)(x, level) else: s = __builtin__.repr(x) if len(s) > self.maxother: i = max(0, (self.maxother-3)//2) j = max(0, self.maxother-3-i) s = s[:i] + '...' + s[len(s)-j:] return s def _repr_iterable(self, x, level, left, right, maxiter, trail=''): n = len(x) if level <= 0 and n: s = '...' else: newlevel = level - 1 repr1 = self.repr1 pieces = [repr1(elem, newlevel) for elem in islice(x, maxiter)] if n > maxiter: pieces.append('...') s = ', '.join(pieces) if n == 1 and trail: right = trail + right return '%s%s%s' % (left, s, right) def repr_tuple(self, x, level): return self._repr_iterable(x, level, '(', ')', self.maxtuple, ',') def repr_list(self, x, level): return self._repr_iterable(x, level, '[', ']', self.maxlist) def repr_array(self, x, level): header = "array('%s', [" % x.typecode return self._repr_iterable(x, level, header, '])', self.maxarray) def repr_set(self, x, level): x = _possibly_sorted(x) return self._repr_iterable(x, level, 'set([', '])', self.maxset) def repr_frozenset(self, x, level): x = _possibly_sorted(x) return self._repr_iterable(x, level, 'frozenset([', '])', self.maxfrozenset) def repr_deque(self, x, level): return self._repr_iterable(x, level, 'deque([', '])', self.maxdeque) def repr_dict(self, x, level): n = len(x) if n == 0: return '{}' if level <= 0: return '{...}' newlevel = level - 1 repr1 = self.repr1 pieces = [] for key in islice(_possibly_sorted(x), self.maxdict): keyrepr = repr1(key, newlevel) valrepr = repr1(x[key], newlevel) pieces.append('%s: %s' % (keyrepr, valrepr)) if n > self.maxdict: pieces.append('...') s = ', '.join(pieces) return '{%s}' % (s,) def repr_str(self, x, level): s = __builtin__.repr(x[:self.maxstring]) if len(s) > self.maxstring: i = max(0, (self.maxstring-3)//2) j = max(0, self.maxstring-3-i) s = __builtin__.repr(x[:i] + x[len(x)-j:]) s = s[:i] + '...' + s[len(s)-j:] return s def repr_long(self, x, level): s = __builtin__.repr(x) # XXX Hope this isn't too slow... if len(s) > self.maxlong: i = max(0, (self.maxlong-3)//2) j = max(0, self.maxlong-3-i) s = s[:i] + '...' + s[len(s)-j:] return s def repr_instance(self, x, level): try: s = __builtin__.repr(x) # Bugs in x.__repr__() can cause arbitrary # exceptions -- then make up something except Exception: return '<%s instance at %x>' % (x.__class__.__name__, id(x)) if len(s) > self.maxstring: i = max(0, (self.maxstring-3)//2) j = max(0, self.maxstring-3-i) s = s[:i] + '...' + s[len(s)-j:] return s def _possibly_sorted(x): # Since not all sequences of items can be sorted and comparison # functions may raise arbitrary exceptions, return an unsorted # sequence in that case. try: return sorted(x) except Exception: return list(x) aRepr = Repr() repr = aRepr.repr
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