~alcinnz/CatTrap

ref: 86d19fc373e7fbe87d08c3ea32e49fc3992db812 CatTrap/Graphics/Layout/CSS.hs -rw-r--r-- 12.6 KiB
86d19fc3 — Adrian Cochrane Improve font styling & it's configurability, expose font-pattern in output. 1 year, 8 months ago 
                                                                                
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
{-# LANGUAGE OverloadedStrings #-}
module Graphics.Layout.CSS where

import Data.CSS.Syntax.Tokens (Token(..))
import qualified Data.Text as Txt
import Stylist (PropertyParser(..), TrivialPropertyParser)
import Stylist.Tree (StyleTree(..))

import Graphics.Layout.Box as B
import Graphics.Layout
import Graphics.Text.Font.Choose (Pattern(..), unset)
import Graphics.Layout.CSS.Internal
import Graphics.Layout.Grid.CSS
import Graphics.Layout.Inline.CSS

data CSSBox a = CSSBox {
    display :: Display,
    boxSizing :: BoxSizing,
    cssBox :: PaddedBox Unitted Unitted, -- Some units need to be resolved per font. calc()?
    font :: Pattern,
    font' :: CSSFont,
    inner :: a,
    gridStyles :: CSSGrid,
    cellStyles :: CSSCell,
    inlineStyles :: CSSInline,
    captionBelow :: Bool
}
data BoxSizing = BorderBox | ContentBox
noborder = Border (0,"px") (0,"px") (0,"px") (0,"px")

data Display = Block | Grid | Inline | Table |
    TableRow | TableHeaderGroup | TableRowGroup | TableFooterGroup | TableCell |
    TableColumn | TableColumnGroup | TableCaption deriving Eq
rowContainer CSSBox { display = d } =
    d `elem` [Table, TableHeaderGroup, TableRowGroup, TableFooterGroup]

instance PropertyParser a => PropertyParser (CSSBox a) where
    temp = CSSBox {
        boxSizing = ContentBox,
        display = Block,
        cssBox = PaddedBox {
            B.min = Size auto auto,
            size = Size auto auto,
            B.max = Size auto auto,
            padding = noborder,
            border = noborder,
            margin = noborder
        },
        font = temp,
        font' = temp,
        inner = temp,
        gridStyles = temp,
        cellStyles = temp,
        inlineStyles = temp,
        captionBelow = False
      }
    inherit parent = CSSBox {
        boxSizing = boxSizing parent,
        display = Block,
        cssBox = cssBox (temp :: CSSBox TrivialPropertyParser),
        font = inherit $ font parent,
        font' = inherit $ font' parent,
        inner = inherit $ inner parent,
        gridStyles = inherit $ gridStyles parent,
        cellStyles = inherit $ cellStyles parent,
        inlineStyles = inherit $ inlineStyles parent,
        captionBelow = captionBelow parent
      }

    -- Wasn't sure how to implement in FontConfig-Pure
    longhand _ self "font-family" [Ident "initial"] =
        Just self { font = unset "family" $ font self}

    longhand _ self "box-sizing" [Ident "content-box"] = Just self {boxSizing = ContentBox}
    longhand _ self "box-sizing" [Ident "border-box"] = Just self {boxSizing = BorderBox}
    longhand _ self "box-sizing" [Ident "initial"] = Just self {boxSizing = ContentBox}

    longhand _ self@CSSBox {cssBox = box} "padding-top" toks | Just x <- parseLength toks =
        Just self { cssBox = box { padding = (padding box) { top = x } } }
    longhand _ self@CSSBox {cssBox = box} "padding-bottom" toks | Just x <- parseLength toks =
        Just self { cssBox = box { padding = (padding box) { bottom = x } } }
    longhand _ self@CSSBox {cssBox = box} "padding-left" toks | Just x <- parseLength toks =
        Just self { cssBox = box { padding = (padding box) { left = x } } }
    longhand _ self@CSSBox {cssBox = box} "padding-right" toks | Just x <- parseLength toks =
        Just self { cssBox = box { padding = (padding box) { right = x } } }
    longhand _ self@CSSBox {cssBox = box} "border-top-width" toks | Just x <- parseLength toks =
        Just self { cssBox = box { border = (border box) { top = x } } }
    longhand _ self@CSSBox {cssBox = box} "border-bottom-width" toks | Just x <- parseLength toks =
        Just self { cssBox = box { border = (border box) { bottom = x } } }
    longhand _ self@CSSBox {cssBox = box} "border-left-width" toks | Just x <- parseLength toks =
        Just self { cssBox = box { border = (border box) { left = x } } }
    longhand _ self@CSSBox {cssBox = box} "border-right-width" toks | Just x <- parseLength toks =
        Just self { cssBox = box { border = (border box) { right = x } } }
    longhand _ self@CSSBox {cssBox = box} "margin-top" toks | Just x <- parseLength toks =
        Just self { cssBox = box { margin = (margin box) { top = x } } }
    longhand _ self@CSSBox {cssBox = box} "margin-bottom" toks | Just x <- parseLength toks =
        Just self { cssBox = box { margin = (margin box) { bottom = x } } }
    longhand _ self@CSSBox {cssBox = box} "margin-left" toks | Just x <- parseLength toks =
        Just self { cssBox = box { margin = (margin box) { left = x } } }
    longhand _ self@CSSBox {cssBox = box} "margin-right" toks | Just x <- parseLength toks =
        Just self { cssBox = box { margin = (margin box) { right = x } } }

    longhand _ self@CSSBox {cssBox = box} "width" toks | Just x <- parseLength' toks =
        Just self { cssBox = box { size = (size box) { inline = x } } }
    longhand _ self@CSSBox {cssBox = box} "height" toks | Just x <- parseLength' toks =
        Just self { cssBox = box { size = (size box) { block = x } } }
    longhand _ self@CSSBox {cssBox = box} "max-width" toks | Just x <- parseLength' toks =
        Just self { cssBox = box { B.max = (B.max box) { inline = x } } }
    longhand _ self@CSSBox {cssBox = box} "min-width" toks | Just x <- parseLength' toks =
        Just self { cssBox = box { B.min = (B.min box) { inline = x } } }
    longhand _ self@CSSBox {cssBox = box} "max-height" toks | Just x <- parseLength' toks =
        Just self { cssBox = box { B.max = (B.max box) { block = x } } }
    longhand _ self@CSSBox {cssBox = box} "min-height" toks | Just x <- parseLength' toks =
        Just self { cssBox = box { B.min = (B.min box) { block = x } } }

    longhand _ self "display" [Ident "block"] = Just self { display = Block }
    longhand _ self "display" [Ident "grid"] = Just self { display = Grid }
    longhand _ self "display" [Ident "table"] = Just self { display = Table }
    longhand CSSBox { display = Table } self "display" [Ident "table-row-group"] =
        Just self { display=TableRowGroup }
    longhand CSSBox { display = Table } self "display" [Ident "table-header-group"] =
        Just self { display = TableHeaderGroup }
    longhand CSSBox { display = Table } self "display" [Ident "table-footer-group"] =
        Just self { display = TableFooterGroup }
    longhand parent self "display" [Ident "table-row"] | rowContainer parent =
        Just self { display = TableRow }
    longhand CSSBox { display = TableRow } self "display" [Ident "table-cell"] =
        Just self { display = TableCell }
    longhand CSSBox { display = Table } self "display" [Ident "table-column-group"] =
        Just self { display = TableColumnGroup }
    longhand CSSBox { display = TableColumnGroup } self "display" [Ident "table-column"] =
        Just self { display = TableColumn }
    longhand CSSBox { display = Table } self "display" [Ident "table-caption"] =
        Just self { display=TableCaption }
    longhand _ self "display" [Ident "inline"] = Just self { display = Inline }
    longhand _ self "display" [Ident "initial"] = Just self { display = Block }

    longhand _ self "caption-side" [Ident "top"] = Just self { captionBelow = False }
    longhand _ self "caption-side" [Ident "bottom"] = Just self { captionBelow = True }
    longhand _ self "caption-side" [Ident "initial"] = Just self {captionBelow = False}

    longhand a b c d | Just x <- longhand (font a) (font b) c d,
        Just y <- longhand (font' a) (font' b) c d =
            Just b { font = x, font' = y } -- Those properties can overlap!
    longhand a b c d | Just font' <- longhand (font a) (font b) c d = Just b {
        font = font'
      }
    longhand a b c d | Just font <- longhand (font' a) (font' b) c d = Just b {
        font' = font
      }
    longhand a b c d | Just inline' <- longhand (inlineStyles a) (inlineStyles b) c d =
        Just b { inlineStyles = inline' }
    longhand a b c d | Just grid' <- longhand (gridStyles a) (gridStyles b) c d =
        Just b { gridStyles = grid' }
    longhand a b c d | Just cell' <- longhand (cellStyles a) (cellStyles b) c d =
        Just b { cellStyles = cell' }
    longhand a b c d | Just inner' <- longhand (inner a) (inner b) c d = Just b {
        inner = inner'
      }
    longhand _ _ _ _ = Nothing

finalizeCSS :: PropertyParser x => Font' -> Font' -> StyleTree (CSSBox x) ->
        LayoutItem Length Length x
finalizeCSS root parent self@StyleTree {
    style = self'@CSSBox { display = Grid, inner = val }, children = childs
  } = LayoutFlow val (finalizeBox self' font_) [
        finalizeGrid (gridStyles self') font_ (map cellStyles $ map style childs)
            (map (finalizeCSS root font_) childs)]
  where
    font_ = pattern2font (font self') (font' self') parent root
finalizeCSS root parent self@StyleTree {
        style = self'@CSSBox { display = Table, captionBelow = False }, children = childs
    } = LayoutFlow (inner self') (finalizeBox self' font_)
        ([finalizeCSS root font_ child { style = child' { display = Block } }
            | child@StyleTree { style = child'@CSSBox { display = TableCaption } } <- childs] ++
        [finalizeTable root font_ (inner self') childs])
  where
    font_ = pattern2font (font self') (font' self') parent root
finalizeCSS root parent self@StyleTree {
        style = self'@CSSBox { display = Table, captionBelow = True }, children = childs
    } = LayoutFlow (inner self') (finalizeBox self' font_)
        (finalizeTable root font_ temp childs:
        [finalizeCSS root font_ child { style = child' { display = Block } }
            | child@StyleTree { style = child'@CSSBox { display = TableCaption } } <- childs])
  where
    font_ = pattern2font (font self') (font' self') parent root
finalizeCSS root parent self@StyleTree {
    style = self'@CSSBox { inner = val }, children = childs
  } = LayoutFlow val (finalizeBox self' font_) (map (finalizeCSS root font_) childs)
  where
    font_ = pattern2font (font self') (font' self') parent root
finalizeCSS' sysfont self@StyleTree { style = self' } =
    finalizeCSS (pattern2font (font self') (font' self') sysfont sysfont) sysfont self

finalizeChilds :: PropertyParser x => Font' -> Font' -> [StyleTree (CSSBox x)] ->
        [LayoutItem Length Length x]
finalizeChilds root parent childs@(child:childs')
    | isInlineTree childs =
        -- FIXME propagate display properties, how to handle the hierarchy.
        [LayoutInline temp parent (finalizeParagraph (flattenTree childs) parent)
                    (repeat temp)]
    | (inlines@(_:_), blocks) <- spanInlines childs =
        LayoutInline temp parent (finalizeParagraph (flattenTree childs) parent) []
            :finalizeChilds root parent blocks
    | otherwise = finalizeCSS root parent child : finalizeChilds root parent childs'
  where
    isInlineTree = all (isInlineTree . children)
    isInlineTree0 StyleTree { style = CSSBox { display = Inline }, children = childs } =
        isInlineTree childs
    isInlineTree0 _ = False
    spanInlines childs = case span isInlineTree0 childs of
        (inlines, (StyleTree {
            style = CSSBox { display = Inline }, children = tail
          }:blocks)) -> let (inlines', blocks') = spanInlines tail
            in (inlines ++ inlines', blocks' ++ blocks)
        ret -> ret
    flattenTree (StyleTree { children = child@(_:_) }:childs) =
        flattenTree child `concatParagraph` flattenTree childs
    flattenTree (child:childs) =
        buildParagraph (inlineStyles $ style child) `concatParagraph` flattenTree childs
    flattenTree [] = ParagraphBuilder "" []
finalizeChilds _ _ [] = []

finalizeBox self@CSSBox { cssBox = box } font_ =
    mapY' (flip finalizeLength font_) $ mapX' (flip finalizeLength font_) box

finalizeTable root parent val childs = LayoutFlow val lengthBox [] -- Placeholder!
{- finalizeTable root parent val childs = LayoutGrid val grid $ zip cells' childs'
  where -- FIXME? How to handle non-table items in <table>?
    grid = Grid {
        rows = take width $ repeat ("", (0,"auto")),
        rowBounds = [],
        subgridRows = 0,
        columns = take height $ repeat ("", (0,"auto")),
        colBounds = [],
        subgridCols = 0,
        gap = Size (0,"px") (0,"px"), -- FIXME where to get this from?
        containerSize = Size Auto Auto, -- Proper size is set on parent.
        containerMin = Size Auto Auto,
        containerMax = Size Auto Auto
    }
    cells' = adjustWidths cells
    
    (cells, width, height) = lowerCells childs
    lowerCells (StyleTree self@CSSBox { display = TableRow } cells:rest) =
        (row:rows, max rowwidth width', succ height)
      where
        (row, rowwidth) = lowerRow cells 0 -- FIXME: How to dodge colspans?
        (rows, width', height') = lowerCells rest
    lowerCells (StyleTree self@CSSBox { display = TableHeaderGroup } childs ) =
        -}