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elm-0.19-workshop/intro/part9/src/Avatar.elm
Richard Feldman 17f96d1b56 Add part9
2018-08-12 14:50:14 -04:00

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Elm

module Avatar exposing (Avatar, decoder, encode, src, toMaybeString)
import Asset
import Html exposing (Attribute)
import Html.Attributes
import Json.Decode as Decode exposing (Decoder)
import Json.Encode as Encode exposing (Value)
-- TYPES
type Avatar
= Avatar (Maybe String)
-- CREATE
decoder : Decoder Avatar
decoder =
Decode.map Avatar (Decode.nullable Decode.string)
-- TRANSFORM
encode : Avatar -> Value
encode (Avatar maybeUrl) =
case maybeUrl of
Just url ->
Encode.string url
Nothing ->
Encode.null
src : Avatar -> Attribute msg
src (Avatar maybeUrl) =
case maybeUrl of
Nothing ->
Asset.src Asset.defaultAvatar
Just "" ->
Asset.src Asset.defaultAvatar
Just url ->
Html.Attributes.src url
toMaybeString : Avatar -> Maybe String
toMaybeString (Avatar maybeUrl) =
maybeUrl