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# Copyright (c) Meta Platforms, Inc. and affiliates.
import logging
from dataclasses import dataclass, field
from typing import Dict, List, Optional, Set, Tuple
import numpy as np
from .parser import (
Patterns,
filter_area,
filter_node,
filter_way,
match_to_group,
parse_area,
parse_node,
parse_way,
)
from .reader import OSMData, OSMNode, OSMRelation, OSMWay
logger = logging.getLogger(__name__)
def glue(ways: List[OSMWay]) -> List[List[OSMNode]]:
result: List[List[OSMNode]] = []
to_process: Set[Tuple[OSMNode]] = set()
for way in ways:
if way.is_cycle():
result.append(way.nodes)
else:
to_process.add(tuple(way.nodes))
while to_process:
nodes: List[OSMNode] = list(to_process.pop())
glued: Optional[List[OSMNode]] = None
other_nodes: Optional[Tuple[OSMNode]] = None
for other_nodes in to_process:
glued = try_to_glue(nodes, list(other_nodes))
if glued is not None:
break
if glued is not None:
to_process.remove(other_nodes)
if is_cycle(glued):
result.append(glued)
else:
to_process.add(tuple(glued))
else:
result.append(nodes)
return result
def is_cycle(nodes: List[OSMNode]) -> bool:
"""Is way a cycle way or an area boundary."""
return nodes[0] == nodes[-1]
def try_to_glue(nodes: List[OSMNode], other: List[OSMNode]) -> Optional[List[OSMNode]]:
"""Create new combined way if ways share endpoints."""
if nodes[0] == other[0]:
return list(reversed(other[1:])) + nodes
if nodes[0] == other[-1]:
return other[:-1] + nodes
if nodes[-1] == other[-1]:
return nodes + list(reversed(other[:-1]))
if nodes[-1] == other[0]:
return nodes + other[1:]
return None
def multipolygon_from_relation(rel: OSMRelation, osm: OSMData):
inner_ways = []
outer_ways = []
for member in rel.members:
if member.type_ == "way":
if member.role == "inner":
if member.ref in osm.ways:
inner_ways.append(osm.ways[member.ref])
elif member.role == "outer":
if member.ref in osm.ways:
outer_ways.append(osm.ways[member.ref])
else:
logger.warning(f'Unknown member role "{member.role}".')
if outer_ways:
inners_path = glue(inner_ways)
outers_path = glue(outer_ways)
return inners_path, outers_path
@dataclass
class MapElement:
id_: int
label: str
group: str
tags: Optional[Dict[str, str]]
@dataclass
class MapNode(MapElement):
xy: np.ndarray
@classmethod
def from_osm(cls, node: OSMNode, label: str, group: str):
return cls(
node.id_,
label,
group,
node.tags,
xy=node.xy,
)
@dataclass
class MapLine(MapElement):
xy: np.ndarray
@classmethod
def from_osm(cls, way: OSMWay, label: str, group: str):
xy = np.stack([n.xy for n in way.nodes])
return cls(
way.id_,
label,
group,
way.tags,
xy=xy,
)
@dataclass
class MapArea(MapElement):
outers: List[np.ndarray]
inners: List[np.ndarray] = field(default_factory=list)
@classmethod
def from_relation(cls, rel: OSMRelation, label: str, group: str, osm: OSMData):
outers_inners = multipolygon_from_relation(rel, osm)
if outers_inners is None:
return None
outers, inners = outers_inners
outers = [np.stack([n.xy for n in way]) for way in outers]
inners = [np.stack([n.xy for n in way]) for way in inners]
return cls(
rel.id_,
label,
group,
rel.tags,
outers=outers,
inners=inners,
)
@classmethod
def from_way(cls, way: OSMWay, label: str, group: str):
xy = np.stack([n.xy for n in way.nodes])
return cls(
way.id_,
label,
group,
way.tags,
outers=[xy],
)
class MapData:
def __init__(self):
self.nodes: Dict[int, MapNode] = {}
self.lines: Dict[int, MapLine] = {}
self.areas: Dict[int, MapArea] = {}
@classmethod
def from_osm(cls, osm: OSMData):
self = cls()
for node in filter(filter_node, osm.nodes.values()):
label = parse_node(node.tags)
if label is None:
continue
group = match_to_group(label, Patterns.nodes)
if group is None:
group = match_to_group(label, Patterns.ways)
if group is None:
continue # missing
self.nodes[node.id_] = MapNode.from_osm(node, label, group)
for way in filter(filter_way, osm.ways.values()):
label = parse_way(way.tags)
if label is None:
continue
group = match_to_group(label, Patterns.ways)
if group is None:
group = match_to_group(label, Patterns.nodes)
if group is None:
continue # missing
self.lines[way.id_] = MapLine.from_osm(way, label, group)
for area in filter(filter_area, osm.ways.values()):
label = parse_area(area.tags)
if label is None:
continue
group = match_to_group(label, Patterns.areas)
if group is None:
group = match_to_group(label, Patterns.ways)
if group is None:
group = match_to_group(label, Patterns.nodes)
if group is None:
continue # missing
self.areas[area.id_] = MapArea.from_way(area, label, group)
for rel in osm.relations.values():
if rel.tags.get("type") != "multipolygon":
continue
label = parse_area(rel.tags)
if label is None:
continue
group = match_to_group(label, Patterns.areas)
if group is None:
group = match_to_group(label, Patterns.ways)
if group is None:
group = match_to_group(label, Patterns.nodes)
if group is None:
continue # missing
area = MapArea.from_relation(rel, label, group, osm)
assert rel.id_ not in self.areas # not sure if there can be collision
if area is not None:
self.areas[rel.id_] = area
return self
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