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58 lines
934 B
Elm
58 lines
934 B
Elm
module Accumulation exposing (..)
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{-| -}
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import Set
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type Style
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= Color String Float Float Float Float
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| Spacing String Float
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| Font String (List String)
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key style =
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case style of
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Color k _ _ _ _ ->
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k
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Spacing k _ ->
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k
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Font k _ ->
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k
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type Element
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= Element (List Style) (List Element)
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| None
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render element =
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case element of
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None ->
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[]
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Element styles children ->
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let
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childrenStyles =
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List.foldr render [] children
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in
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styles ++ childrenStyles
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finalize styles =
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List.foldl deduplicate ( Set.empty, [] ) styles
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deduplicate style ( cached, styles ) =
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if Set.member (key style) then
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( cached, styles )
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else
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( Set.insert (key style), style :: styles )
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toHtml element =
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render element
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|> finalize
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