allow tables and iterators as input

Project.toml

@@ -9,6 +9,7 @@ Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
 GeoInterface = "cf35fbd7-0cd7-5166-be24-54bfbe79505f"
 GeoJSON = "61d90e0f-e114-555e-ac52-39dfb47a3ef9"
 JSON3 = "0f8b85d8-7281-11e9-16c2-39a750bddbf1"
+Tables = "bd369af6-aec1-5ad0-b16a-f7cc5008161c"
 UUIDs = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
 WebIO = "0f1e0344-ec1d-5b48-a673-e5cf874b6c29"
 
@@ -17,6 +18,7 @@ Colors = "0.12"
 GeoInterface = "1"
 GeoJSON = "0.6"
 JSON3 = "1"
+Tables = "1"
 WebIO = "0.8"
 julia = "1"
 

src/layer.jl

@@ -34,6 +34,37 @@ function Layer(
     marker_size = 3.0,
     border_width = 2.0,
 )
+
+    # Handle inputs that are not geometries or features
+    if isnothing(GeoInterface.trait(data))
+        if Tables.istable(data)
+            # Create a FeatureCollection from a Tables.jl compatible table
+            geoms = FeatureCollection(data)
+        else
+            # Otherwise try to treat `data` as an iterator
+            try
+                if !isnothing(iterate(data))
+                    x = first(data)
+                    if GeoInterface.isgeometry(x)
+                        geoms = FeatureCollection(GeoJSON.Feature.(data))
+                    elseif GeoInterface.isfeature(x)
+                        features = data isa AbstractArray ? data : collect(data)
+                        geoms = FeatureCollection(features)
+                    else
+                        _not_compatible_error()
+                    end
+                else
+                    _not_compatible_error()
+                end
+            catch
+                _not_compatible_error()
+            end
+        end
+    else
+        geoms = data
+    end
+
+    # Define options
     options = Dict(
         :color_map => string(color_map), 
         :color => string(color), 
@@ -42,5 +73,8 @@ function Layer(
         :marker_size => marker_size, 
         :border_width => border_width,
     )
-    Layer(data, options)
+
+    return Layer(geoms, options)
 end
+
+_not_compatible_error() = throw(ArgumentError("data is not a GeoInterace compatible Feature or Geometry"))

src/map.jl

@@ -97,10 +97,7 @@ end
 function leaflet_javascript(layers, cfg::Config)
     io = IOBuffer()
     for (i, layer) in enumerate(layers)
-        data = layer.data
-        isnothing(GeoInterface.trait(data)) &&
-            throw(ArgumentError("data is not a GeoInterace compatible Feature or Geometry"))
-        write(io, "var data$i = ", GeoJSON.write(data), ";\n")
+        write(io, "var data$i = ", GeoJSON.write(layer.data), ";\n")
         if layer.options[:color] != "nothing"
             color = layer.options[:color]
             if isa(color, Symbol)