mirror of
https://github.com/osm-search/Nominatim.git
synced 2024-11-27 10:43:02 +03:00
8171fe4571
Sanatizer functions allow to transform name and address tags before they are handed to the tokenizer. Theses transformations are visible only for the tokenizer and thus only have an influence on the search terms and address match terms for a place. Currently two sanitizers are implemented which are responsible for splitting names with multiple values and removing bracket additions. Both was previously hard-coded in the tokenizer.
128 lines
4.2 KiB
Python
128 lines
4.2 KiB
Python
"""
|
|
Handler for cleaning name and address tags in place information before it
|
|
is handed to the token analysis.
|
|
"""
|
|
import importlib
|
|
|
|
from nominatim.errors import UsageError
|
|
|
|
class PlaceName:
|
|
""" A searchable name for a place together with properties.
|
|
Every name object saves the name proper and two basic properties:
|
|
* 'kind' describes the name of the OSM key used without any suffixes
|
|
(i.e. the part after the colon removed)
|
|
* 'suffix' contains the suffix of the OSM tag, if any. The suffix
|
|
is the part of the key after the first colon.
|
|
In addition to that, the name may have arbitrary additional attributes.
|
|
Which attributes are used, depends on the token analyser.
|
|
"""
|
|
|
|
def __init__(self, name, kind, suffix):
|
|
self.name = name
|
|
self.kind = kind
|
|
self.suffix = suffix
|
|
self.attr = {}
|
|
|
|
|
|
def __repr__(self):
|
|
return f"PlaceName(name='{self.name}',kind='{self.kind}',suffix='{self.suffix}')"
|
|
|
|
|
|
def clone(self, name=None, kind=None, suffix=None, attr=None):
|
|
""" Create a deep copy of the place name, optionally with the
|
|
given parameters replaced. In the attribute list only the given
|
|
keys are updated. The list is not replaced completely.
|
|
In particular, the function cannot to be used to remove an
|
|
attribute from a place name.
|
|
"""
|
|
newobj = PlaceName(name or self.name,
|
|
kind or self.kind,
|
|
suffix or self.suffix)
|
|
|
|
newobj.attr.update(self.attr)
|
|
if attr:
|
|
newobj.attr.update(attr)
|
|
|
|
return newobj
|
|
|
|
|
|
def set_attr(self, key, value):
|
|
""" Add the given property to the name. If the property was already
|
|
set, then the value is overwritten.
|
|
"""
|
|
self.attr[key] = value
|
|
|
|
|
|
def get_attr(self, key, default=None):
|
|
""" Return the given property or the value of 'default' if it
|
|
is not set.
|
|
"""
|
|
return self.attr.get(key, default)
|
|
|
|
|
|
def has_attr(self, key):
|
|
""" Check if the given attribute is set.
|
|
"""
|
|
return key in self.attr
|
|
|
|
|
|
class _ProcessInfo:
|
|
""" Container class for information handed into to handler functions.
|
|
The 'names' and 'address' members are mutable. A handler must change
|
|
them by either modifying the lists place or replacing the old content
|
|
with a new list.
|
|
"""
|
|
|
|
def __init__(self, place):
|
|
self.place = place
|
|
self.names = self._convert_name_dict(place.name)
|
|
self.address = self._convert_name_dict(place.address)
|
|
|
|
|
|
@staticmethod
|
|
def _convert_name_dict(names):
|
|
""" Convert a dictionary of names into a list of PlaceNames.
|
|
The dictionary key is split into the primary part of the key
|
|
and the suffix (the part after an optional colon).
|
|
"""
|
|
out = []
|
|
|
|
if names:
|
|
for key, value in names.items():
|
|
parts = key.split(':', 1)
|
|
out.append(PlaceName(value.strip(),
|
|
parts[0].strip(),
|
|
parts[1].strip() if len(parts) > 1 else None))
|
|
|
|
return out
|
|
|
|
|
|
class PlaceSanitizer:
|
|
""" Controller class which applies sanitizer functions on the place
|
|
names and address before they are used by the token analysers.
|
|
"""
|
|
|
|
def __init__(self, rules):
|
|
self.handlers = []
|
|
|
|
if rules:
|
|
for func in rules:
|
|
if 'step' not in func:
|
|
raise UsageError("Sanitizer rule is missing the 'step' attribute.")
|
|
module_name = 'nominatim.tokenizer.sanitizers.' + func['step'].replace('-', '_')
|
|
handler_module = importlib.import_module(module_name)
|
|
self.handlers.append(handler_module.create(func))
|
|
|
|
|
|
def process_names(self, place):
|
|
""" Extract a sanitized list of names and address parts from the
|
|
given place. The function returns a tuple
|
|
(list of names, list of address names)
|
|
"""
|
|
obj = _ProcessInfo(place)
|
|
|
|
for func in self.handlers:
|
|
func(obj)
|
|
|
|
return obj.names, obj.address
|