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use osmformat;
use osmformat::{PrimitiveGroup, PrimitiveBlock};
use std;
use std::slice;
use std::iter::Chain;
use std::iter::Map;
use objects::{OsmObj, Node, Way, Relation, Ref, OsmId, Tags};
pub type OsmObjs<'a> = Chain<Chain<Map<Nodes<'a>, fn(Node) -> OsmObj>, Map<Ways<'a>, fn(Way) -> OsmObj>>, Map<Relations<'a>, fn(Relation) -> OsmObj>>;
pub fn iter<'a>(g: &'a PrimitiveGroup, b: &'a PrimitiveBlock) -> OsmObjs<'a> {
fn node_into_obj(n: Node) -> OsmObj { OsmObj::Node(n) }
fn way_into_obj(w: Way) -> OsmObj { OsmObj::Way(w) }
fn rel_into_obj(r: Relation) -> OsmObj { OsmObj::Relation(r) }
nodes(g, b).map(node_into_obj as fn(Node) -> OsmObj)
.chain(ways(g, b).map(way_into_obj as fn(Way) -> OsmObj))
.chain(relations(g, b).map(rel_into_obj as fn(Relation) -> OsmObj))
}
pub type Nodes<'a> = std::iter::Chain<SimpleNodes<'a>, DenseNodes<'a>>;
pub fn nodes<'a>(g: &'a PrimitiveGroup, b: &'a PrimitiveBlock) -> Nodes<'a> {
simple_nodes(g, b).chain(dense_nodes(g, b))
}
pub fn simple_nodes<'a>(group: &'a PrimitiveGroup, block: &'a PrimitiveBlock)
-> SimpleNodes<'a>
{
SimpleNodes { iter: group.get_nodes().iter(), block: block }
}
pub struct SimpleNodes<'a> {
iter: slice::Iter<'a, osmformat::Node>,
block: &'a PrimitiveBlock,
}
impl<'a> Iterator for SimpleNodes<'a> {
type Item = Node;
fn next(&mut self) -> Option<Node> {
self.iter.next().map(|n| Node {
id: n.get_id(),
decimicro_lat: make_lat(n.get_lat(), self.block),
decimicro_lon: make_lon(n.get_lon(), self.block),
tags: make_tags(n.get_keys(), n.get_vals(), self.block),
})
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.iter.size_hint()
}
}
pub fn dense_nodes<'a>(group: &'a PrimitiveGroup, block: &'a PrimitiveBlock)
-> DenseNodes<'a>
{
let dense = group.get_dense();
DenseNodes {
block: block,
dids: dense.get_id().iter(),
dlats: dense.get_lat().iter(),
dlons: dense.get_lon().iter(),
keys_vals: dense.get_keys_vals().iter(),
cur_id: 0,
cur_lat: 0,
cur_lon: 0,
}
}
pub struct DenseNodes<'a> {
block: &'a PrimitiveBlock,
dids: slice::Iter<'a, i64>,
dlats: slice::Iter<'a, i64>,
dlons: slice::Iter<'a, i64>,
keys_vals: slice::Iter<'a, i32>,
cur_id: i64,
cur_lat: i64,
cur_lon: i64,
}
impl<'a> Iterator for DenseNodes<'a> {
type Item = Node;
fn next(&mut self) -> Option<Node> {
match (self.dids.next(), self.dlats.next(), self.dlons.next()) {
(Some(&did), Some(&dlat), Some(&dlon)) => {
self.cur_id += did;
self.cur_lat += dlat;
self.cur_lon += dlon;
}
_ => return None
}
let mut tags = Tags::new();
loop {
let k = match self.keys_vals.next() {
None | Some(&0) => break,
Some(k) => make_string(*k as usize, self.block),
};
let v = match self.keys_vals.next() {
None => break,
Some(v) => make_string(*v as usize, self.block),
};
tags.insert(k, v);
}
shrink_to_fit(&mut tags);
Some(Node {
id: self.cur_id,
decimicro_lat: make_lat(self.cur_lat, self.block),
decimicro_lon: make_lon(self.cur_lon, self.block),
tags: tags,
})
}
}
pub fn ways<'a>(group: &'a PrimitiveGroup, block: &'a PrimitiveBlock) -> Ways<'a> {
Ways { iter: group.get_ways().iter(), block: block }
}
pub struct Ways<'a> {
iter: slice::Iter<'a, osmformat::Way>,
block: &'a PrimitiveBlock,
}
impl<'a> Iterator for Ways<'a> {
type Item = Way;
fn next(&mut self) -> Option<Way> {
self.iter.next().map(|w| {
let mut n = 0;
let nodes = w.get_refs().iter().map(|&dn| { n += dn; n }).collect();
Way {
id: w.get_id(),
nodes: nodes,
tags: make_tags(w.get_keys(), w.get_vals(), self.block),
}
})
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.iter.size_hint()
}
}
pub fn relations<'a>(group: &'a PrimitiveGroup, block: &'a PrimitiveBlock) -> Relations<'a> {
Relations { iter: group.get_relations().iter(), block: block }
}
pub struct Relations<'a> {
iter: slice::Iter<'a, osmformat::Relation>,
block: &'a PrimitiveBlock,
}
impl<'a> Iterator for Relations<'a> {
type Item = Relation;
fn next(&mut self) -> Option<Relation> {
use osmformat::Relation_MemberType::{NODE, WAY, RELATION};
self.iter.next().map(|rel| {
let mut m = 0;
let refs = rel.get_memids().iter()
.zip(rel.get_types().iter())
.zip(rel.get_roles_sid().iter())
.map(|((&dm, &t), &role)| {
m += dm;
Ref {
member: match t {
NODE => OsmId::Node(m),
WAY => OsmId::Way(m),
RELATION => OsmId::Relation(m),
},
role: make_string(role as usize, self.block),
}
}).collect();
Relation {
id: rel.get_id(),
refs: refs,
tags: make_tags(rel.get_keys(), rel.get_vals(), self.block),
}
})
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.iter.size_hint()
}
}
fn make_string(k: usize, block: &osmformat::PrimitiveBlock) -> String {
String::from_utf8_lossy(&*block.get_stringtable().get_s()[k])
.into_owned()
}
fn make_lat(c: i64, b: &osmformat::PrimitiveBlock) -> i32 {
let granularity = b.get_granularity() as i64;
((b.get_lat_offset() + granularity * c) / 100) as i32
}
fn make_lon(c: i64, b: &osmformat::PrimitiveBlock) -> i32 {
let granularity = b.get_granularity() as i64;
((b.get_lon_offset() + granularity * c) / 100) as i32
}
fn make_tags(keys: &[u32], vals: &[u32], b: &PrimitiveBlock) -> Tags {
let mut tags = Tags::with_capacity(keys.len());
let iter = keys.iter().zip(vals.iter())
.map(|(&k, &v)| (make_string(k as usize, b), make_string(v as usize, b)));
tags.extend(iter);
tags
}
fn shrink_to_fit(tags: &mut Tags) {
let mut other = Tags::with_capacity(tags.len());
::std::mem::swap(tags, &mut other);
tags.extend(other.into_iter());
}