Decaffeinate remaining methods of the Tile class

src/Tile.coffee

@@ -1,153 +0,0 @@
-###
-  termap - Terminal Map Viewer
-  by Michael Strassburger <codepoet@cpan.org>
-
-  Handling of and access to single VectorTiles
-###
-
-VectorTile = require('@mapbox/vector-tile').VectorTile
-Protobuf = require 'pbf'
-Promise = require 'bluebird'
-zlib = require 'zlib'
-rbush = require 'rbush'
-x256 = require 'x256'
-earcut = require 'earcut'
-
-config = require "./config"
-utils = require "./utils"
-
-class Tile
-  layers: {}
-
-  constructor: (@styler) ->
-
-  load: (buffer) ->
-    @_unzipIfNeeded buffer
-    .then (buffer) => @_loadTile buffer
-    .then => @_loadLayers()
-    .then => this
-
-  _loadTile: (buffer) ->
-    @tile = new VectorTile new Protobuf buffer
-
-  _unzipIfNeeded: (buffer) ->
-    new Promise (resolve, reject) =>
-      if @_isGzipped buffer
-        zlib.gunzip buffer, (err, data) ->
-          return reject err if err
-          resolve data
-      else
-        resolve buffer
-
-  _isGzipped: (buffer) ->
-    buffer.slice(0,2).indexOf(Buffer.from([0x1f, 0x8b])) is 0
-
-  _loadLayers: () ->
-    layers = {}
-    colorCache = {}
-
-    for name, layer of @tile.layers
-      nodes = []
-      #continue if name is "water"
-      for i in [0...layer.length]
-        # TODO: caching of similar attributes to avoid looking up the style each time
-        #continue if @styler and not @styler.getStyleFor layer, feature
-
-        feature = layer.feature i
-        feature.properties.$type = type = [undefined, "Point", "LineString", "Polygon"][feature.type]
-
-        if @styler
-          style = @styler.getStyleFor name, feature
-          continue unless style
-
-        color =
-          style.paint['line-color'] or
-          style.paint['fill-color'] or
-          style.paint['text-color']
-
-        # TODO: style zoom stops handling
-        if color instanceof Object
-          color = color.stops[0][1]
-
-        colorCode = colorCache[color] or colorCache[color] = x256 utils.hex2rgb color
-
-        # TODO: monkey patching test case for tiles with a reduced extent 4096 / 8 -> 512
-        # use feature.loadGeometry() again as soon as we got a 512 extent tileset
-        geometries = feature.loadGeometry() #@_reduceGeometry feature, 8
-
-        sort = feature.properties.localrank or feature.properties.scalerank
-        label = if style.type is "symbol"
-          feature.properties["name_"+config.language] or
-          feature.properties.name_en or
-          feature.properties.name or
-          feature.properties.house_num
-        else
-          undefined
-
-        if style.type is "fill"
-          nodes.push @_addBoundaries true,
-#            id: feature.id
-            layer: name
-            style: style
-            label: label
-            sort: sort
-            points: geometries
-            color: colorCode
-
-        else
-
-          for points in geometries
-            nodes.push @_addBoundaries false,
-#             id: feature.id
-              layer: name
-              style: style
-              label: label
-              sort: sort
-              points: points
-              color: colorCode
-
-
-      tree = rbush 18
-      tree.load nodes
-
-      layers[name] =
-        extent: layer.extent
-        tree: tree
-
-    @layers = layers
-
-  _addBoundaries: (deep, data) ->
-    minX = Infinity
-    maxX = -Infinity
-    minY = Infinity
-    maxY = -Infinity
-
-    for p in (if deep then data.points[0] else data.points)
-      minX = p.x if p.x < minX
-      maxX = p.x if p.x > maxX
-      minY = p.y if p.y < minY
-      maxY = p.y if p.y > maxY
-
-    data.minX = minX
-    data.maxX = maxX
-    data.minY = minY
-    data.maxY = maxY
-    data
-
-  _reduceGeometry: (feature, factor) ->
-    for points, i in feature.loadGeometry()
-      reduced = []
-      last = null
-      for point in points
-        p =
-          x: Math.floor point.x/factor
-          y: Math.floor point.y/factor
-
-        if last and last.x is p.x and last.y is p.y
-          continue
-
-        reduced.push last = p
-
-      reduced
-
-module.exports = Tile

src/Tile.js

@@ -53,12 +53,11 @@ class Tile {
   }
 
   _loadLayers() {
-    var color, colorCache, colorCode, k, layers, len, nodes, points, style, tree;
-    layers = {};
-    colorCache = {};
+    const layers = {};
+    const colorCache = {};
     for (const name in this.tile.layers) {
       const layer = this.tile.layers[name];
-      nodes = [];
+      const nodes = [];
       //continue if name is 'water'
       for (let i = 0; i < layer.length; i++) {
         // TODO: caching of similar attributes to avoid looking up the style each time
@@ -66,13 +65,14 @@ class Tile {
         
         const feature = layer.feature(i);
         feature.properties.$type = [undefined, 'Point', 'LineString', 'Polygon'][feature.type];
+        let style;
         if (this.styler) {
           style = this.styler.getStyleFor(name, feature);
           if (!style) {
             continue;
           }
         }
-        color = (
+        let color = (
           style.paint['line-color'] ||
           style.paint['fill-color'] ||
           style.paint['text-color']
@@ -81,7 +81,7 @@ class Tile {
         if (color instanceof Object) {
           color = color.stops[0][1];
         }
-        colorCode = colorCache[color] || (colorCache[color] = x256(utils.hex2rgb(color)));
+        const colorCode = colorCache[color] || (colorCache[color] = x256(utils.hex2rgb(color)));
         // TODO: monkey patching test case for tiles with a reduced extent 4096 / 8 -> 512
         // use feature.loadGeometry() again as soon as we got a 512 extent tileset
         const geometries = feature.loadGeometry(); //@_reduceGeometry feature, 8
@@ -98,10 +98,9 @@ class Tile {
             color: colorCode,
           }));
         } else {
-          for (k = 0, len = geometries.length; k < len; k++) {
-            points = geometries[k];
+          for (const points of geometries) {
             nodes.push(this._addBoundaries(false, {
-              //             id: feature.id
+              //id: feature.id,
               layer: name,
               style,
               label,
@@ -112,11 +111,11 @@ class Tile {
           }
         }
       }
-      tree = rbush(18);
+      const tree = rbush(18);
       tree.load(nodes);
       layers[name] = {
         extent: layer.extent,
-        tree: tree,
+        tree,
       };
     }
     return this.layers = layers;
@@ -142,16 +141,13 @@ class Tile {
   }
 
   _reduceGeometry(feature, factor) {
-    var i, j, k, last, len, len1, p, point, points, reduced, ref, results;
-    ref = feature.loadGeometry();
-    results = [];
-    for (i = j = 0, len = ref.length; j < len; i = ++j) {
-      points = ref[i];
-      reduced = [];
-      last = null;
-      for (k = 0, len1 = points.length; k < len1; k++) {
-        point = points[k];
-        p = {
+    const results = [];
+    const geometries = feature.loadGeometry();
+    for (const points of geometries) {
+      const reduced = [];
+      let last;
+      for (const point of points) {
+        const p = {
           x: Math.floor(point.x / factor),
           y: Math.floor(point.y / factor)
         };