support Inf and NaN for Floats, BE to FE still needs a patched JSON3,…

… PR pending

src/stipple/jsmethods.jl

@@ -210,6 +210,31 @@ function js_add_reviver(revivername::String)
   """
 end
 
+"""
+    js_add_serializer(serializername::String)
+
+Add a serializer function to the list of Genie's serializers.
+
+This function is meant for package developer who want to make additional js content available for the user.
+This resulting script needs to be added to the dependencies of an app in order to be executed.
+
+If you want to add a custom serializer to your model you should rather consider using `@mounted`, e.g.
+
+```julia
+@methods \"\"\"
+myserializer: function(value) { return value + 1 }
+\"\"\"
+@mounted "Genie.Serializers.addSerializer(this.myserializer)"
+```
+"""
+function js_add_serializer(serializername::String)
+  """
+  document.addEventListener('DOMContentLoaded', () => Genie.WebChannels.subscriptionHandlers.push(function(event) {
+      Genie.Serializers.addSerializer($serializername);
+  }));
+  """
+end
+
 """
     js_initscript(initscript::String)
 

src/stipple/json.jl

@@ -1,5 +1,8 @@
 const JSONParser = JSON3
-const json = JSON3.write
+
+# for inf values no reviver is necessary, but
+stipple_inf_mapping(x) = x == Inf ? "1e1000" : x == -Inf ? "-1e1000" : "\"__nan__\""
+json(args; inf_mapping::Function = stipple_inf_mapping, kwargs...) = JSON3.write(args; inf_mapping, kwargs...)
 
 struct JSONText
   s::String

src/stipple/parsers.jl

@@ -75,7 +75,15 @@ end
 
 #String to AbstractFloat
 function stipple_parse(::Type{T}, value::String) where T<:AbstractFloat
-  Base.parse(T, value)
+  if value == "__nan__"
+    NaN
+  elseif value == "__inf__"
+    Inf
+  elseif value == "__neginf__"
+    -Inf
+  else
+    Base.parse(T, value)
+  end
 end
 
 # Union with Nothing

src/stipple/rendering.jl

@@ -142,7 +142,7 @@ function Stipple.render(app::M)::Dict{Symbol,Any} where {M<:ReactiveModel}
   end
 
   # convert :data to () => ({   })
-  data = JSON3.write(merge(result, client_data(app)))
+  data = json(merge(result, client_data(app)))
 
   vue = Dict(
     :mixins => JSONText("[watcherMixin, reviveMixin, eventMixin, filterMixin]"),

test/runtests.jl

@@ -621,7 +621,7 @@ end
     @test exported_values[:s] == "Hello"
     @test exported_values[:x] == 4
 
-    values_json = JSON3.write(exported_values)
+    values_json = Stipple.json(exported_values)
     exported_values_json = Stipple.ModelStorage.model_values(model, json = true)
     @test values_json == exported_values_json
 
@@ -631,7 +631,7 @@ end
     @test model.s[] == "world"
     @test model.x[] == 5
 
-    values_json = Dict(:i => 30, :s => "zero", :x => 50) |> JSON3.write |> string
+    values_json = Dict(:i => 30, :s => "zero", :x => 50) |> Stipple.json |> string
     Stipple.ModelStorage.load_model_values!(model, values_json)
     @test model.i[] == 30
     @test model.s[] == "zero"