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import re
import sys
import thandy
class Schema:
def matches(self, obj):
try:
self.checkMatch(obj)
except thandy.FormatException:
return False
else:
return True
def checkMatch(self, obj):
raise NotImplemented()
class Any(Schema):
"""
>>> s = Any()
>>> s.matches("A String")
True
>>> s.matches([1, "list"])
True
"""
def checkMatch(self, obj):
pass
class RE(Schema):
"""
>>> s = RE("h.*d")
>>> s.matches("hello world")
True
>>> s.matches("Hello World")
False
>>> s.matches("hello world!")
False
>>> s.matches([33, "Hello"])
False
"""
def __init__(self, pat=None, modifiers=0, reObj=None, reName="pattern"):
if not reObj:
if not pat.endswith("$"):
pat += "$"
reObj = re.compile(pat, modifiers)
self._re = reObj
self._reName = reName
def checkMatch(self, obj):
if not isinstance(obj, basestring) or not self._re.match(obj):
raise thandy.FormatException("%r did not match %s"
%(obj,self._reName))
class Str(Schema):
"""
>>> s = Str("Hi")
>>> s.matches("Hi")
True
>>> s.matches("Not hi")
False
"""
def __init__(self, val):
self._str = val
def checkMatch(self, obj):
if self._str != obj:
raise thandy.FormatException("Expected %r; got %r"%(self._str, obj))
class AnyStr(Schema):
"""
>>> s = AnyStr()
>>> s.matches("")
True
>>> s.matches("a string")
True
>>> s.matches(["a"])
False
>>> s.matches(3)
False
>>> s.matches(u"a unicode string")
True
>>> s.matches({})
False
"""
def __init__(self):
pass
def checkMatch(self, obj):
if not isinstance(obj, basestring):
raise thandy.FormatException("Expected a string; got %r"%obj)
class ListOf(Schema):
"""
>>> s = ListOf(RE("(?:..)*"))
>>> s.matches("hi")
False
>>> s.matches([])
True
>>> s.matches({})
False
>>> s.matches(["Hi", "this", "list", "is", "full", "of", "even", "strs"])
True
>>> s.matches(["This", "one", "is not"])
False
"""
def __init__(self, schema, minCount=0, maxCount=sys.maxint,listName="list"):
self._schema = schema
self._minCount = minCount
self._maxCount = maxCount
self._listName = listName
def checkMatch(self, obj):
if not isinstance(obj, (list, tuple)):
raise thandy.FormatException("Expected %s; got %r"
%(self._listName,obj))
for item in obj:
try:
self._schema.checkMatch(item)
except thandy.FormatException, e:
raise thandy.FormatException("%s in %s"%(e, self._listName))
if not (self._minCount <= len(obj) <= self._maxCount):
raise thandy.FormatException("Length of %s out of range"
%self._listName)
class Struct(Schema):
"""
>>> s = Struct([ListOf(AnyStr()), AnyStr(), Str("X")])
>>> s.matches(False)
False
>>> s.matches("Foo")
False
>>> s.matches([[], "Q", "X"])
True
>>> s.matches([[], "Q", "D"])
False
>>> s.matches([[3], "Q", "X"])
False
>>> s.matches([[], "Q", "X", "Y"])
False
"""
def __init__(self, subschemas, allowMore=False, structName="list"):
self._subschemas = subschemas[:]
self._allowMore = allowMore
self._structName = structName
def checkMatch(self, obj):
if not isinstance(obj, (list, tuple)):
raise thandy.FormatException("Expected %s; got %r"
%(self._structName,obj))
elif len(obj) < len(self._subschemas):
raise thandy.FormatException(
"Too few fields in %s"%self._structName)
elif len(obj) > len(self._subschemas) and not self._allowMore:
raise thandy.FormatException(
"Too many fields in %s"%self._structName)
for item, schema in zip(obj, self._subschemas):
schema.checkMatch(item)
class DictOf(Schema):
"""
>>> s = DictOf(RE(r'[aeiou]+'), Struct([AnyStr(), AnyStr()]))
>>> s.matches("")
False
>>> s.matches({})
True
>>> s.matches({"a": ["x", "y"], "e" : ["", ""]})
True
>>> s.matches({"a": ["x", 3], "e" : ["", ""]})
False
>>> s.matches({"a": ["x", "y"], "e" : ["", ""], "d" : ["a", "b"]})
False
"""
def __init__(self, keySchema, valSchema):
self._keySchema = keySchema
self._valSchema = valSchema
def checkMatch(self, obj):
try:
iter = obj.iteritems()
except AttributeError:
raise thandy.FormatException("Expected a dict; got %r"%obj)
for k,v in iter:
self._keySchema.checkMatch(k)
self._valSchema.checkMatch(v)
class Opt:
"""Helper; applied to a value in Obj to mark it optional.
>>> s = Obj(k1=Str("X"), k2=Opt(Str("Y")))
>>> s.matches({'k1': "X", 'k2': "Y"})
True
>>> s.matches({'k1': "X", 'k2': "Z"})
False
>>> s.matches({'k1': "X"})
True
"""
def __init__(self, schema):
self._schema = schema
def checkMatch(self, obj):
self._schema.checkMatch(obj)
class Obj(Schema):
"""
>>> s = Obj(a=AnyStr(), bc=Struct([Int(), Int()]))
>>> s.matches({'a':"ZYYY", 'bc':[5,9]})
True
>>> s.matches({'a':"ZYYY", 'bc':[5,9], 'xx':5})
True
>>> s.matches({'a':"ZYYY", 'bc':[5,9,3]})
False
>>> s.matches({'a':"ZYYY"})
False
"""
def __init__(self, _objname="object", **d):
self._objname = _objname
self._required = d.items()
def checkMatch(self, obj):
for k,schema in self._required:
try:
item = obj[k]
except KeyError:
if not isinstance(schema, Opt):
raise thandy.FormatException("Missing key %s in %s"
%(k,self._objname))
else:
try:
schema.checkMatch(item)
except thandy.FormatException, e:
raise thandy.FormatException("%s in %s.%s"
%(e,self._objname,k))
class Int(Schema):
"""
>>> s = Int()
>>> s.matches(99)
True
>>> s.matches(False)
False
>>> s.matches(0L)
True
>>> s.matches("a string")
False
>>> Int(lo=10, hi=30).matches(25)
True
>>> Int(lo=10, hi=30).matches(5)
False
"""
def __init__(self, lo=-sys.maxint, hi=sys.maxint):
self._lo = lo
self._hi = hi
def checkMatch(self, obj):
if isinstance(obj, bool) or not isinstance(obj, (int, long)):
# We need to check for bool as a special case, since bool
# is for historical reasons a subtype of int.
raise thandy.FormatException("Got %r instead of an integer"%obj)
elif not (self._lo <= obj <= self._hi):
raise thandy.FormatException("%r not in range [%r,%r]"
%(obj, self._lo, self._hi))
class Bool(Schema):
"""
>>> s = Bool()
>>> s.matches(True) and s.matches(False)
True
>>> s.matches(11)
False
"""
def __init__(self):
pass
def checkMatch(self, obj):
if not isinstance(obj, bool):
raise thandy.FormatException("Got %r instead of a boolean"%obj)
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