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Add an experimental mechanism to support extending the pprint formatting.

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Partly responds to SF bug #505152.
This commit is contained in:
Fred Drake 2002-04-02 05:08:35 +00:00
parent 4993c51b94
commit aee113d368
3 changed files with 57 additions and 9 deletions
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22
Lib/pprint.py
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@ -115,15 +115,11 @@ class PrettyPrinter:
return sio.getvalue()
def isrecursive(self, object):
self.__recursive = 0
self.__repr(object, {}, 0)
return self.__recursive
return self.format(object, {}, 0)[2]
def isreadable(self, object):
self.__recursive = 0
self.__readable = 1
self.__repr(object, {}, 0)
return self.__readable and not self.__recursive
s, readable, recursive = self.format(object, {}, 0)
return readable and not recursive
def __format(self, object, stream, indent, allowance, context, level):
level = level + 1
@ -196,14 +192,22 @@ class PrettyPrinter:
write(rep)
def __repr(self, object, context, level):
repr, readable, recursive = _safe_repr(object, context,
self.__depth, level)
repr, readable, recursive = self.format(object, context.copy(),
self.__depth, level)
if not readable:
self.__readable = 0
if recursive:
self.__recursive = 1
return repr
def format(self, object, context, maxlevels, level):
"""Format object for a specific context, returning a string
and flags indicating whether the representation is 'readable'
and whether the object represents a recursive construct.
"""
return _safe_repr(object, context, maxlevels, level)
# Return triple (repr_string, isreadable, isrecursive).
def _safe_repr(object, context, maxlevels, level):