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import re
import six
known_bad = set((
'addressed',
'app_id',
'data',
'eta', # TODO(schwehr): Fix this.
'radio',
'regional',
'reserved',
'structured',
))
precision = 5.0
def TextToNumber(text):
try:
return float(text)
except (TypeError, ValueError):
return text
def IsNumber(value):
if isinstance(value, float):
return True
if isinstance(value, six.integer_types):
return True
return False
def DictDiff(a, b):
"""Compares two dictionaries. Intended to be used in a test to
compare the actual return value from some function with a
known-good value.
Returns a dictionary with the following keys:
removed: Dict of all key/value pairs in a but not in b.
added: Dict of all key/value pairs in b but not in a.
changed: Dict with all keys with different values in a and b.
Values are pairs of the values from a and b.
"""
def Compare(x, y):
if x == y:
return True
x = TextToNumber(x)
y = TextToNumber(y)
if isinstance(x, six.string_types) and isinstance(y, six.string_types):
# Collapse strings to just lower case a-z to avoid simple mismatches.
new_x = re.sub(r'[^a-z]', r'', six.text_type(x).lower())
new_y = re.sub(r'[^a-z]', r'', six.text_type(y).lower())
if new_x == new_y:
return True
if IsNumber(x) and IsNumber(y):
if abs(float(x) - float(y)) < precision:
return True
return False
# TODO(redhog): Use sets and make this easier to follow.
return {
'removed': {key: a[key] for key in a
if key not in b and key not in known_bad},
'changed': {key: (a[key], b[key]) for key in a
if key in b
and key not in known_bad
and not Compare(a[key], b[key])},
'added': {key: b[key] for key in b
if key not in a and key not in known_bad}
}
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