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lex_types.go
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/
lex_types.go
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package wkt
type geomFlatCoordsRepr struct {
flatCoords []float64
ends []int
}
func makeGeomFlatCoordsRepr(flatCoords []float64) geomFlatCoordsRepr {
return geomFlatCoordsRepr{flatCoords: flatCoords, ends: []int{len(flatCoords)}}
}
func appendGeomFlatCoordsReprs(p1, p2 geomFlatCoordsRepr) geomFlatCoordsRepr {
if len(p1.ends) > 0 {
p1LastEnd := p1.ends[len(p1.ends)-1]
for i := range p2.ends {
p2.ends[i] += p1LastEnd
}
}
return geomFlatCoordsRepr{flatCoords: append(p1.flatCoords, p2.flatCoords...), ends: append(p1.ends, p2.ends...)}
}
type multiPolygonFlatCoordsRepr struct {
flatCoords []float64
endss [][]int
}
func makeMultiPolygonFlatCoordsRepr(p geomFlatCoordsRepr) multiPolygonFlatCoordsRepr {
if p.flatCoords == nil {
return multiPolygonFlatCoordsRepr{flatCoords: nil, endss: [][]int{nil}}
}
return multiPolygonFlatCoordsRepr{flatCoords: p.flatCoords, endss: [][]int{p.ends}}
}
func appendMultiPolygonFlatCoordsRepr(
p1, p2 multiPolygonFlatCoordsRepr,
) multiPolygonFlatCoordsRepr {
p1LastEndsLastEnd := 0
for i := len(p1.endss) - 1; i >= 0; i-- {
if len(p1.endss[i]) > 0 {
p1LastEndsLastEnd = p1.endss[i][len(p1.endss[i])-1]
break
}
}
if p1LastEndsLastEnd > 0 {
for i := range p2.endss {
for j := range p2.endss[i] {
p2.endss[i][j] += p1LastEndsLastEnd
}
}
}
return multiPolygonFlatCoordsRepr{
flatCoords: append(p1.flatCoords, p2.flatCoords...), endss: append(p1.endss, p2.endss...),
}
}