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103 lines
3.2 KiB
Elm
103 lines
3.2 KiB
Elm
module Shiki exposing (Highlighted, decoder, view)
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import Html exposing (Html)
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import Html.Attributes as Attr exposing (class)
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import Html.Lazy
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import OptimizedDecoder as Decode exposing (Decoder)
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type alias ShikiToken =
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{ content : String
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, color : Maybe String
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, fontStyle : Maybe ( String, String )
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}
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type alias Highlighted =
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{ lines : List (List ShikiToken)
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, fg : String
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, bg : String
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}
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decoder : Decoder Highlighted
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decoder =
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Decode.map3 Highlighted
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(Decode.field "tokens" (Decode.list (Decode.list shikiTokenDecoder)))
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(Decode.field "fg" Decode.string)
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(Decode.field "bg" Decode.string)
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shikiTokenDecoder : Decode.Decoder ShikiToken
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shikiTokenDecoder =
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Decode.map3 ShikiToken
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(Decode.field "content" Decode.string)
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(Decode.optionalField "color" Decode.string)
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(Decode.optionalField "fontStyle" fontStyleDecoder |> Decode.map (Maybe.andThen identity))
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fontStyleDecoder : Decoder (Maybe ( String, String ))
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fontStyleDecoder =
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Decode.int
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|> Decode.map
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(\styleNumber ->
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case styleNumber of
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1 ->
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Just ( "font-style", "italic" )
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2 ->
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Just ( "font-style", "bold" )
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4 ->
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Just ( "font-style", "underline" )
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_ ->
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Nothing
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)
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{-| <https://github.com/shikijs/shiki/blob/2a31dc50f4fbdb9a63990ccd15e08cccc9c1566a/packages/shiki/src/renderer.ts#L16>
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-}
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view : List (Html.Attribute msg) -> Highlighted -> Html msg
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view attrs highlighted =
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highlighted.lines
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|> List.indexedMap
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(\lineIndex line ->
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let
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isLastLine =
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List.length highlighted.lines == (lineIndex + 1)
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in
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Html.span [ class "line" ]
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((line
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|> List.map
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(\token ->
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Html.span
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[ Attr.style "color" (token.color |> Maybe.withDefault highlighted.fg)
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, token.fontStyle
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|> Maybe.map
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(\( key, value ) ->
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Attr.style key value
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)
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|> Maybe.withDefault (Attr.title "")
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]
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[ Html.text token.content ]
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)
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)
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++ [ if isLastLine then
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Html.text ""
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else
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Html.text "\n"
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]
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)
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)
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|> Html.code []
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|> List.singleton
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|> Html.pre
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([ Attr.style "background-color" highlighted.bg
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, Attr.style "white-space" "pre-wrap"
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, Attr.style "overflow-wrap" "break-word"
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]
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++ attrs
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)
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