| [4096] | 1 | import xml.sax
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| 2 | import OSM
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| 3 |
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| 4 | (EMPTY, ROOT, NODE, SEGMENT, WAY) = range(5)
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| 5 |
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| 6 | class OSMReader(xml.sax.handler.ContentHandler):
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| 7 | def __init__(self):
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| 8 | self.state = EMPTY
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| 9 | self.obj = None
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| 10 | self.nodeHandler = None
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| 11 | self.segmentHandler = None
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| 12 | self.wayHandler = None
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| 13 | self.tagHandler = None
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| 14 |
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| 15 | def run(self, f):
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| 16 | self.state = EMPTY
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| 17 | self.obj = None
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| 18 | parser = xml.sax.make_parser()
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| 19 | parser.setContentHandler(self)
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| 20 | parser.parse(f)
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| 21 |
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| 22 | def startElement(self, name, attrs):
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| 23 | if name == "node":
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| 24 | if self.state != ROOT:
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| 25 | raise Exception("Got node in %d state" % self.state)
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| 26 | self.state = NODE
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| 27 | node_id = int(attrs["id"])
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| 28 | lat = float(attrs["lat"])
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| 29 | lon = float(attrs["lon"])
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| 30 | timestamp = attrs.get("timestamp", None)
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| 31 | self.obj = OSM.Node(node_id, lat, lon, timestamp)
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| 32 | elif name == "tag":
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| 33 | if self.obj is None:
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| 34 | raise Exception("Got tag when not inside any object")
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| 35 | k = attrs.get("k")
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| 36 | v = attrs.get("v")
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| 37 | self.obj.tags[k] = v
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| 38 | if self.tagHandler:
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| 39 | self.tagHandler(k, v)
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| 40 | elif name == "segment":
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| 41 | if self.state != ROOT:
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| 42 | raise Exception("Got segment in %d state" % self.state)
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| 43 | self.state = SEGMENT
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| 44 | self.obj = OSM.Segment(attrs)
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| 45 | elif name == "way":
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| 46 | if self.state != ROOT:
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| 47 | raise Exception("Got way in %d state" % self.state)
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| 48 | self.state = WAY
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| 49 | self.obj = OSM.Way(attrs)
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| 50 | elif name == "seg":
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| 51 | if self.state != WAY:
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| 52 | raise Exception("Got seg in state %d!" % self.state)
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| 53 | self.obj.segs.append(int(attrs["id"]))
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| 54 | elif name == "osm":
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| 55 | if self.state != EMPTY:
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| 56 | raise Exception("Got osm in %d state" % self.state)
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| 57 | self.state = ROOT
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| 58 |
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| 59 | def endElement(self, name):
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| 60 | if name == "node":
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| 61 | if self.state != NODE:
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| 62 | raise Exception("Got /node in state %d!" % self.state)
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| 63 | if self.nodeHandler:
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| 64 | self.nodeHandler(self.obj)
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| 65 | self.obj = None
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| 66 | self.state = ROOT
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| 67 | elif name == "segment":
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| 68 | if self.state != SEGMENT:
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| 69 | raise Exception("Got /segment in state %d!" % self.state)
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| 70 | if self.segmentHandler:
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| 71 | self.segmentHandler(self.obj)
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| 72 | self.obj = None
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| 73 | self.state = ROOT
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| 74 | elif name == "way":
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| 75 | if self.state != WAY:
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| 76 | raise Exception("Got /way in state %d!" % self.state)
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| 77 | if self.wayHandler:
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| 78 | self.wayHandler(self.obj)
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| 79 | self.obj = None
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| 80 | self.state = ROOT
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| 81 | elif name == "osm":
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| 82 | if self.state != ROOT:
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| 83 | raise Exception("Got /osm in state %d!" % self.state)
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| 84 | self.state = EMPTY
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