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"""
DOM parsing for the OpenStreetMap API.
"""
from datetime import datetime
import xml.dom.minidom
import xml.parsers.expat
import logging
from typing import Any, Union, Optional
from xml.dom.minidom import Element
from . import errors
from . import xmlbuilder
logger = logging.getLogger(__name__)
def OsmResponseToDom(
response: bytes, tag: str, single: bool = False, allow_empty: bool = False
) -> Union[Element, list[Element]]:
"""
Returns the (sub-) DOM parsed from an OSM response
"""
try:
dom = xml.dom.minidom.parseString(response)
osm_dom = dom.getElementsByTagName("osm")[0]
all_data = osm_dom.getElementsByTagName(tag)
first_element = all_data[0]
except IndexError as e:
if allow_empty:
return []
raise errors.XmlResponseInvalidError(
f"The XML response from the OSM API is invalid: {e!r}"
)
except xml.parsers.expat.ExpatError as e:
raise errors.XmlResponseInvalidError(
f"The XML response from the OSM API is invalid: {e!r}"
)
if single:
return first_element
return list(all_data)
def dom_parse_node(dom_element: Element) -> dict[str, Any]:
"""
Returns NodeData for the node.
"""
result = _dom_get_attributes(dom_element)
result["tag"] = _dom_get_tag(dom_element)
return result
def dom_parse_way(dom_element: Element) -> dict[str, Any]:
"""
Returns WayData for the way.
"""
result = _dom_get_attributes(dom_element)
result["tag"] = _dom_get_tag(dom_element)
result["nd"] = _dom_get_nd(dom_element)
return result
def dom_parse_relation(dom_element: Element) -> dict[str, Any]:
"""
Returns RelationData for the relation.
"""
result = _dom_get_attributes(dom_element)
result["tag"] = _dom_get_tag(dom_element)
result["member"] = _dom_get_member(dom_element)
return result
def dom_parse_changeset(
dom_element: Element, include_discussion: bool = False
) -> dict[str, Any]:
"""
Returns ChangesetData for the changeset.
"""
result = _dom_get_attributes(dom_element)
result["tag"] = _dom_get_tag(dom_element)
if include_discussion:
result["discussion"] = _dom_get_discussion(dom_element)
return result
def dom_parse_note(dom_element: Element) -> dict[str, Any]:
"""
Returns NoteData for the note.
"""
result = _dom_get_attributes(dom_element)
result["id"] = xmlbuilder._get_xml_value(dom_element, "id")
result["status"] = xmlbuilder._get_xml_value(dom_element, "status")
result["date_created"] = _parse_date(
xmlbuilder._get_xml_value(dom_element, "date_created")
)
result["date_closed"] = _parse_date(
xmlbuilder._get_xml_value(dom_element, "date_closed")
)
result["comments"] = _dom_get_comments(dom_element)
return result
def _dom_get_attributes(dom_element: Element) -> dict[str, Any]:
"""
Returns a formated dictionnary of attributes of a dom_element.
"""
def is_true(v: str) -> bool:
return v == "true"
attribute_mapping: dict[str, Any] = {
"uid": int,
"changeset": int,
"version": int,
"id": int,
"lat": float,
"lon": float,
"open": is_true,
"visible": is_true,
"ref": int,
"comments_count": int,
"timestamp": _parse_date,
"created_at": _parse_date,
"closed_at": _parse_date,
"date": _parse_date,
}
result: dict[str, Any] = {}
for k, v in dom_element.attributes.items():
try:
result[k] = attribute_mapping[k](v)
except KeyError:
result[k] = v
return result
def _dom_get_tag(dom_element: Element) -> dict[str, str]:
"""
Returns the dictionnary of tags of a dom_element.
"""
result: dict[str, str] = {}
for t in dom_element.getElementsByTagName("tag"):
k = t.attributes["k"].value
v = t.attributes["v"].value
result[k] = v
return result
def _dom_get_nd(dom_element: Element) -> list[int]:
"""
Returns the list of nodes of a dom_element.
"""
result: list[int] = []
for t in dom_element.getElementsByTagName("nd"):
result.append(int(int(t.attributes["ref"].value)))
return result
def _dom_get_discussion(dom_element: Element) -> list[dict[str, Any]]:
"""
Returns the dictionnary of comments of a dom_element.
"""
result: list[dict[str, Any]] = []
try:
discussion = dom_element.getElementsByTagName("discussion")[0]
for t in discussion.getElementsByTagName("comment"):
comment = _dom_get_attributes(t)
comment["text"] = xmlbuilder._get_xml_value(t, "text")
result.append(comment)
except IndexError:
pass
return result
def _dom_get_comments(dom_element: Element) -> list[dict[str, Any]]:
"""
Returns the list of comments of a dom_element.
"""
result: list[dict[str, Any]] = []
for t in dom_element.getElementsByTagName("comment"):
comment: dict[str, Any] = {}
comment["date"] = _parse_date(xmlbuilder._get_xml_value(t, "date"))
comment["action"] = xmlbuilder._get_xml_value(t, "action")
comment["text"] = xmlbuilder._get_xml_value(t, "text")
comment["html"] = xmlbuilder._get_xml_value(t, "html")
comment["uid"] = xmlbuilder._get_xml_value(t, "uid")
comment["user"] = xmlbuilder._get_xml_value(t, "user")
result.append(comment)
return result
def _dom_get_member(dom_element: Element) -> list[dict[str, Any]]:
"""
Returns a list of relation members.
"""
result: list[dict[str, Any]] = []
for m in dom_element.getElementsByTagName("member"):
result.append(_dom_get_attributes(m))
return result
def _parse_date(date_string: Optional[str]) -> Union[datetime, str, None]:
date_formats = ["%Y-%m-%d %H:%M:%S UTC", "%Y-%m-%dT%H:%M:%SZ"]
for date_format in date_formats:
try:
result = datetime.strptime(date_string, date_format) # type: ignore[arg-type] # noqa: E501
return result
except (ValueError, TypeError):
logger.debug(f"{date_string} does not match {date_format}")
return date_string
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