272 lines
6.3 KiB
Go
272 lines
6.3 KiB
Go
package parser
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import (
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"fmt"
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"goposm/element"
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"log"
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"os"
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"osmpbf"
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)
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type PBF struct {
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file *os.File
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filename string
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offset int64
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}
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type BlockPosition struct {
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filename string
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offset int64
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size int32
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}
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func Open(filename string) (f *PBF, err error) {
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file, err := os.Open(filename)
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if err != nil {
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return nil, err
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}
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f = &PBF{filename: filename, file: file}
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return f, nil
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}
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func (pbf *PBF) Close() error {
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return pbf.file.Close()
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}
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func (pbf *PBF) NextDataPosition() (offset int64, size int32) {
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header := pbf.nextBlobHeader()
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size = header.GetDatasize()
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offset = pbf.offset
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pbf.offset += int64(size)
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pbf.file.Seek(pbf.offset, 0)
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if header.GetType() == "OSMHeader" {
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return pbf.NextDataPosition()
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}
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return
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}
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const COORD_FACTOR float64 = 11930464.7083 // ((2<<31)-1)/360.0
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func coordToInt(coord float64) uint32 {
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return uint32((coord + 180.0) * COORD_FACTOR)
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}
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func intToCoord(coord uint32) float64 {
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return float64((float64(coord) / COORD_FACTOR) - 180.0)
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}
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func ReadDenseNodes(
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dense *osmpbf.DenseNodes,
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block *osmpbf.PrimitiveBlock,
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stringtable StringTable) (nodes []element.Node) {
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var lastId int64
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var lastLon, lastLat int64
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nodes = make([]element.Node, len(dense.Id))
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granularity := int64(block.GetGranularity())
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latOffset := block.GetLatOffset()
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lonOffset := block.GetLonOffset()
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coordScale := 0.000000001
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lastKeyValPos := 0
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for i := range nodes {
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lastId += dense.Id[i]
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lastLon += dense.Lon[i]
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lastLat += dense.Lat[i]
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nodes[i].Id = lastId
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nodes[i].Long = (coordScale * float64(lonOffset+(granularity*lastLon)))
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nodes[i].Lat = (coordScale * float64(latOffset+(granularity*lastLat)))
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if dense.KeysVals[lastKeyValPos] != 0 {
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nodes[i].Tags = ParseDenseNodeTags(stringtable, &dense.KeysVals, &lastKeyValPos)
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} else {
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lastKeyValPos += 1
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}
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}
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return nodes
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}
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func ParseDenseNodeTags(stringtable StringTable, keysVals *[]int32, pos *int) map[string]string {
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result := make(map[string]string)
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for {
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if *pos >= len(*keysVals) {
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return result
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}
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key := (*keysVals)[*pos]
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*pos += 1
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if key == 0 {
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return result
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}
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val := (*keysVals)[*pos]
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*pos += 1
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result[stringtable[key]] = stringtable[val]
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}
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return result
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}
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func ParseTags(stringtable StringTable, keys []uint32, vals []uint32) map[string]string {
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tags := make(map[string]string)
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for i := 0; i < len(keys); i++ {
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key := stringtable[keys[i]]
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val := stringtable[vals[i]]
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tags[key] = val
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}
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return tags
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}
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func ReadNodes(
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nodes []*osmpbf.Node,
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block *osmpbf.PrimitiveBlock,
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stringtable StringTable) []element.Node {
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result := make([]element.Node, len(nodes))
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granularity := int64(block.GetGranularity())
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latOffset := block.GetLatOffset()
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lonOffset := block.GetLonOffset()
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coordScale := 0.000000001
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for i := range nodes {
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id := *nodes[i].Id
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lon := *nodes[i].Lon
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lat := *nodes[i].Lat
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result[i].Id = id
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result[i].Long = (coordScale * float64(lonOffset+(granularity*lon)))
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result[i].Lat = (coordScale * float64(latOffset+(granularity*lat)))
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result[i].Tags = ParseTags(stringtable, nodes[i].Keys, nodes[i].Vals)
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}
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return result
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}
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func ParseDeltaRefs(refs []int64) []int64 {
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result := make([]int64, len(refs))
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var lastRef int64
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for i, refDelta := range refs {
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lastRef += refDelta
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result[i] = lastRef
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}
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return result
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}
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func ReadWays(
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ways []*osmpbf.Way,
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block *osmpbf.PrimitiveBlock,
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stringtable StringTable) []element.Way {
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result := make([]element.Way, len(ways))
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for i := range ways {
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id := *ways[i].Id
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result[i].Id = id
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result[i].Tags = ParseTags(stringtable, ways[i].Keys, ways[i].Vals)
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result[i].Nodes = ParseDeltaRefs(ways[i].Refs)
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}
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return result
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}
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func ParseRelationMembers(rel *osmpbf.Relation, stringtable StringTable) []element.Member {
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result := make([]element.Member, len(rel.Memids))
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var lastId int64
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for i := range rel.Memids {
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lastId += rel.Memids[i]
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result[i].Id = lastId
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result[i].Role = stringtable[rel.RolesSid[i]]
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result[i].Type = element.MemberType(rel.Types[i])
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}
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return result
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}
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func ReadRelations(
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relations []*osmpbf.Relation,
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block *osmpbf.PrimitiveBlock,
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stringtable StringTable) []element.Relation {
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result := make([]element.Relation, len(relations))
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for i := range relations {
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id := *relations[i].Id
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result[i].Id = id
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result[i].Tags = ParseTags(stringtable, relations[i].Keys, relations[i].Vals)
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result[i].Members = ParseRelationMembers(relations[i], stringtable)
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}
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return result
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}
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type StringTable []string
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func NewStringTable(source *osmpbf.StringTable) StringTable {
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result := make(StringTable, len(source.S))
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for i, bytes := range source.S {
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result[i] = string(bytes)
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}
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return result
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}
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func PBFBlockPositions(filename string) chan BlockPosition {
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pbf, err := Open(filename)
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if err != nil {
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log.Fatal(err)
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}
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return pbf.BlockPositions()
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}
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func ParseBlock(pos BlockPosition, nodes chan element.Node, ways chan element.Way, relations chan element.Relation) {
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block := ReadPrimitiveBlock(pos)
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stringtable := NewStringTable(block.GetStringtable())
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for _, group := range block.Primitivegroup {
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dense := group.GetDense()
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if dense != nil {
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parsedNodes := ReadDenseNodes(dense, block, stringtable)
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for _, node := range parsedNodes {
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nodes <- node
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}
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}
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parsedNodes := ReadNodes(group.Nodes, block, stringtable)
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for _, node := range parsedNodes {
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nodes <- node
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}
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parsedWays := ReadWays(group.Ways, block, stringtable)
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for _, way := range parsedWays {
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ways <- way
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}
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parsedRelations := ReadRelations(group.Relations, block, stringtable)
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for _, rel := range parsedRelations {
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relations <- rel
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}
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}
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}
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func PBFStats(filename string) {
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pbf, err := Open(filename)
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if err != nil {
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log.Fatal(err)
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}
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var nodesCounter, relationsCounter, waysCounter int
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for pos := range pbf.BlockPositions() {
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block := ReadPrimitiveBlock(pos)
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stringtable := NewStringTable(block.GetStringtable())
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for _, group := range block.Primitivegroup {
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dense := group.GetDense()
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if dense != nil {
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_ = ReadDenseNodes(dense, block, stringtable)
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nodesCounter += len(dense.Id)
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}
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_ = ReadNodes(group.Nodes, block, stringtable)
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nodesCounter += len(group.Nodes)
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waysCounter += len(group.Ways)
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_ = ReadWays(group.Ways, block, stringtable)
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relationsCounter += len(group.Relations)
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_ = ReadRelations(group.Relations, block, stringtable)
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}
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}
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fmt.Printf("nodes: %v\tways: %v\trelations:%v\n", nodesCounter, waysCounter, relationsCounter)
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}
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