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Parser.elm
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Parser.elm
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module DiveSvg.Parser exposing (load)
{-| .
@docs load
-}
import Xml.Parser exposing (..)
import DiveSvg.Model exposing (..)
import Dict exposing (Dict)
import Matrix3 exposing (Float3x3)
import Regex exposing (HowMany(AtMost))
import Svg exposing (svg, node, rect, Svg, tspan)
import Svg.Attributes exposing (x, y, width, height, viewBox)
import VirtualDom exposing (attribute, property, text)
import Tuple exposing (..)
import Json.Encode as Enc
import String
getFloat key attr =
Dict.fromList attr
|> Dict.get key
|> Maybe.andThen (String.toFloat >> Result.toMaybe)
findNumber child result =
case result of
Nothing ->
case child of
Body nr ->
String.toFloat nr
|> Result.toMaybe
Element _ _ children ->
List.foldl findNumber Nothing children
_ ->
Nothing
Just nr ->
Just nr
op2Matrix op =
Maybe.withDefault Matrix3.identity <|
if String.startsWith "translate" op then
numbers2 op
|> Maybe.map
(\( x, y ) ->
( ( 1, 0, 0 )
, ( 0, 1, 0 )
, ( x, y, 1 )
)
)
else if String.startsWith "rotate" op then
Nothing
else if String.startsWith "scale" op then
Nothing
else if String.startsWith "skewX" op then
Nothing
else if String.startsWith "skewY" op then
Nothing
else if String.startsWith "matrix" op then
numbers6 op
|> Maybe.map
(\( a, b, c, d, e, f ) ->
( ( a, b, 0 )
, ( c, d, 0 )
, ( e, f, 1 )
)
)
else
Nothing
floatRegex =
Regex.regex "[-+]?[0-9]*\\.?[0-9]+([eE][-+]?[0-9]+)?"
numbers2 op =
case Regex.find (AtMost 2) floatRegex op of
{ match } :: rest ->
String.toFloat match
|> Result.toMaybe
|> Maybe.andThen
(\x ->
List.head rest
|> Maybe.map (.match >> String.toFloat)
|> Maybe.andThen Result.toMaybe
|> Maybe.map ((,) x)
)
_ ->
Nothing
numbers6 op =
let
toMaybe =
.match >> String.toFloat >> Result.toMaybe
in
case Regex.find (AtMost 6) floatRegex op of
a :: b :: c :: d :: e :: f :: _ ->
map6 (,,,,,)
(toMaybe a)
(toMaybe b)
(toMaybe c)
(toMaybe d)
(toMaybe e)
(toMaybe f)
_ ->
Nothing
map6 mapFunc a b c d e f =
Maybe.map2 (\( a, b, c ) ( d, e, f ) -> mapFunc a b c d e f)
(Maybe.map3 (,,) a b c)
(Maybe.map3 (,,) d e f)
frame2Matrix { x, y, w, h } =
( ( w, 0, 0 )
, ( 0, h, 0 )
, ( x, y, 1 )
)
matrix2Frame ( ( w, _, _ ), ( _, h, _ ), ( x, y, _ ) ) =
Frame x y w h
attr2Matrix attr =
case Dict.fromList attr |> Dict.get "transform" of
Just value ->
Regex.find Regex.All (Regex.regex "(translate|scale|matrix|skewX|skewY|rotate)\\(.+?\\)") value
|> List.foldr
(\{ match } matrix ->
op2Matrix match
|> Matrix3.mul matrix
)
Matrix3.identity
_ ->
Matrix3.identity
transformFrame : Float3x3 -> Frame -> Frame
transformFrame matrix frame =
matrix
|> Matrix3.mul (frame2Matrix frame)
|> matrix2Frame
foldFrame child ( nr, frame ) =
let
getFrame attr =
getFloat "x" attr
|> Maybe.andThen
(\x ->
getFloat "y" attr
|> Maybe.andThen
(\y ->
getFloat "width" attr
|> Maybe.andThen
(\width ->
getFloat "height" attr
|> Maybe.andThen
(\height ->
Frame x y width height
|> Just
)
)
)
)
in
case child of
Element name attr children ->
if name == "rect" then
let
dict =
Dict.fromList attr
in
case Dict.get "style" dict of
Just style ->
if not <| String.contains "stroke:#ff0000" style then
( nr, frame )
else
( nr
, getFrame attr
)
_ ->
case Dict.get "stroke" dict of
Just color ->
if color /= "#ff0000" then
( nr, frame )
else
( nr
, getFrame attr
)
_ ->
( nr, frame )
else if name == "text" then
( case List.foldl findNumber Nothing children of
Just nr ->
Just nr
Nothing ->
nr
, frame
)
else
( nr, frame )
_ ->
( nr, frame )
findFrame name attr children =
if name /= "g" then
( Nothing, Nothing )
else
List.foldl foldFrame ( Nothing, Nothing ) children
frame2Viewbox current =
(toString current.x)
++ " "
++ (toString current.y)
++ " "
++ (toString current.w)
++ " "
++ (toString current.h)
parseRoot : List XmlAst -> ( Frame -> Svg msg, List Frame )
parseRoot roots =
let
errorMsg msg =
( \_ -> text msg
, []
)
isSvgTag item =
case item of
Element "svg" _ _ ->
True
_ ->
False
in
case List.filter isSvgTag roots of
(Element "svg" attr children) :: _ ->
let
( nodes, frames ) =
parse [] (attr2Matrix attr) children
in
( (\frame ->
svg
((toAttr attr)
++ [ frame2Viewbox frame
|> viewBox
, width "99vw"
, height "99vh"
, attribute "preserveAspectRatio" "xMidYMid meet"
]
)
nodes
)
, List.sortBy first frames
|> List.map second
)
_ ->
errorMsg "no svg tag found"
parse : List ( Float, Frame ) -> Float3x3 -> List XmlAst -> ( List (VirtualDom.Node msg), List ( Float, Frame ) )
parse frames parentTransformations children =
List.map (parseChild frames parentTransformations) children
|> List.unzip
|> mapFirst List.concat
|> mapSecond List.concat
parseChild : List ( Float, Frame ) -> Float3x3 -> XmlAst -> ( List (VirtualDom.Node msg), List ( Float, Frame ) )
parseChild frames parentTransformations child =
case child of
Element "image" attr children ->
( [ Svg.node "image"
(List.map
(\( k, v ) ->
if k == "xlink:href" then
( "href", v )
else
( k, v )
)
attr
|> toAttr
)
[]
]
, frames
)
Element name attr children ->
let
parentTransformations_ =
parentTransformations
|> Matrix3.mul (attr2Matrix attr)
in
case findFrame name attr children of
( Just nr, Just frame ) ->
( [], ( nr, transformFrame parentTransformations_ frame ) :: frames )
_ ->
let
( nodes, frames_ ) =
parse frames parentTransformations_ children
in
( [ Svg.node name
(toAttr attr)
nodes
]
, frames_
)
Body str ->
( [ tspan
[ Enc.string str
|> property "innerHTML"
]
[]
]
, frames
)
_ ->
( [], frames )
toAttr =
List.map (uncurry attribute)
{-| -}
load : String -> Result String Model
load xml =
let
( slides, frames ) =
parseXml xml
|> Result.map parseRoot
|> (\result ->
case result of
Ok ( slides, frames ) ->
( slides
, frames
)
Err err ->
( (\_ -> text <| toString err)
, []
)
)
in
case frames of
head :: rest ->
Ok <| Model head rest Nothing slides
_ ->
Err "no frames found"