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from typing import Any, List, Optional
from . import fields
from .traversal import Annotation, Traversal
class Difference(Annotation):
def __init__(self, prefix: Optional[str], field: "fields.Field", first: Any, second: Any):
super().__init__(prefix, field)
self.first = first
self.second = second
def __str__(self):
return "{}: first: {}, second: {}".format(
self.qualified_field,
self.field.to_str(self.first),
self.field.to_str(self.second))
class MissingOne(Difference):
def __str__(self):
if self.first is None:
return "{}: first is not set".format(self.qualified_field)
else:
return "{}: second is not set".format(self.qualified_field)
class ExtraItems(Difference):
def __str__(self):
if len(self.first) > len(self.second):
diff = len(self.first) - len(self.second)
longer = "first"
else:
diff = len(self.second) - len(self.first)
longer = "second"
if diff == 1:
return "{}: {} has 1 extra element".format(self.qualified_field, longer)
else:
return "{}: {} has {} extra elements".format(self.qualified_field, longer, diff)
class Diff(Traversal):
def __init__(self, prefix: Optional[str] = None, differences: Optional[List[Difference]] = None):
super().__init__(prefix)
self.differences: List[Difference]
if differences is None:
self.differences = []
else:
self.differences = differences
def with_prefix(self, prefix: str):
return Diff(prefix, self.differences)
def add_different(self, field: "fields.Field", first: Any, second: Any):
self.differences.append(Difference(self.prefix, field, first, second))
def add_only_first(self, field: "fields.Field", first: Any):
self.differences.append(MissingOne(self.prefix, field, first, None))
def add_only_second(self, field: "fields.Field", second: Any):
self.differences.append(MissingOne(self.prefix, field, None, second))
def add_different_length(self, field: "fields.Field", first: Any, second: Any):
self.differences.append(ExtraItems(self.prefix, field, first, second))
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