cattrap (empty) → 0.1.0.0
raw patch · 17 files changed
+3387/−0 lines, 17 filesdep +GLUTdep +QuickCheckdep +balkonsetup-changed
Dependencies added: GLUT, QuickCheck, balkon, base, bytestring, cattrap, containers, css-syntax, fontconfig-pure, gl, harfbuzz-pure, hspec, scientific, stylist-traits, text, xml
Files
- CHANGELOG.md +5/−0
- Graphics/Layout.hs +366/−0
- Graphics/Layout/Arithmetic.hs +141/−0
- Graphics/Layout/Box.hs +164/−0
- Graphics/Layout/CSS.hs +295/−0
- Graphics/Layout/CSS/Font.hs +228/−0
- Graphics/Layout/CSS/Length.hs +106/−0
- Graphics/Layout/Flow.hs +148/−0
- Graphics/Layout/Grid.hs +202/−0
- Graphics/Layout/Grid/CSS.hs +359/−0
- Graphics/Layout/Inline.hs +74/−0
- Graphics/Layout/Inline/CSS.hs +60/−0
- LICENSE +674/−0
- Setup.hs +2/−0
- app/Main.hs +214/−0
- cattrap.cabal +56/−0
- test/Test.hs +293/−0
+ CHANGELOG.md view
@@ -0,0 +1,5 @@+# Revision history for cattrap++## 0.1.0.0 -- YYYY-mm-dd++* First version. Released on an unsuspecting world.
+ Graphics/Layout.hs view
@@ -0,0 +1,366 @@+{-# LANGUAGE OverloadedStrings, RecordWildCards #-}+-- | Generic layout logic, handling a hierarchy of varying formulas.+-- Unless callers have more specific needs they probably wish to use this abstraction.+-- Attempts to follow the CSS specs.+-- See `boxLayout` for a main entrypoint,+-- & `Graphics.Layout.CSS` to receive CSS input.+module Graphics.Layout(LayoutItem(..),+ layoutGetBox, layoutGetChilds, layoutGetInner,+ boxMinWidth, boxMaxWidth, boxNatWidth, boxWidth,+ boxNatHeight, boxMinHeight, boxMaxHeight, boxHeight,+ boxSplit, boxPaginate, boxPosition, boxLayout, glyphsPerFont) where++import Data.Text.ParagraphLayout (Paragraph(..), ParagraphOptions(..), Fragment(..),+ ParagraphLayout(..), PageOptions(..), PageContinuity(..), paginate, layoutPlain)+import Stylist (PropertyParser(..))++import Graphics.Layout.Box as B+import Graphics.Layout.Grid as G+import Graphics.Layout.Flow as F+import Graphics.Layout.Inline as I+import Graphics.Layout.CSS.Font (Font'(..))++import Data.Maybe (fromMaybe)++-- To gather glyphs for atlases.+import qualified Data.IntSet as IS+import qualified Data.Map.Strict as M+import qualified Data.Text.Glyphize as Hb+import Graphics.Text.Font.Choose (Pattern)++-- | A tree of different layout algorithms.+-- More to come...+data LayoutItem m n x =+ -- | A block element. With margins, borders, & padding.+ LayoutFlow x (PaddedBox m n) [LayoutItem m n x]+ -- | A grid or table element.+ | LayoutGrid x (Grid m n) [GridItem] [LayoutItem m n x]+ -- | Some richtext.+ | LayoutInline x Font' Paragraph PageOptions [x] -- Balkon holds children.+ -- | Results laying out richtext, has fixed width.+ -- Generated from `LayoutInline` for the sake of pagination.+ | LayoutInline' x Font' ParagraphLayout PageOptions [x]+ -- | Children of a `LayoutInline` or `LayoutInline'`.+ | LayoutSpan x Font' Fragment+-- | An empty box.+nullLayout :: (PropertyParser x, Zero m, Zero n) => LayoutItem m n x+nullLayout = LayoutFlow temp zero []++--- | Retrieve the surrounding box for a layout item.+layoutGetBox :: (Zero m, Zero n, CastDouble m, CastDouble n) =>+ LayoutItem m n x -> PaddedBox m n+layoutGetBox (LayoutFlow _ ret _) = ret+layoutGetBox (LayoutGrid _ self _ _) = zero {+ B.min = Size (fromDouble $ trackMin toDouble $ inline self)+ (fromDouble $ trackMin toDouble $ block self),+ B.size = Size (fromDouble $ trackNat toDouble $ inline self)+ (fromDouble $ trackNat toDouble $ block self),+ B.max = Size (fromDouble $ trackNat toDouble $ inline self)+ (fromDouble $ trackNat toDouble $ block self)+}+layoutGetBox (LayoutInline _ f self _ _) = zero {+ B.min = inlineMin f self, B.size = inlineSize f self, B.max = inlineSize f self+}+layoutGetBox (LayoutInline' _ f self _ _) = zero {+ B.min = layoutSize f self, B.size = layoutSize f self, B.max = layoutSize f self+}+layoutGetBox (LayoutSpan _ f self) = zero {+ B.min = fragmentSize f self, B.size = fragmentSize f self, B.max = fragmentSize f self+}+-- | Retrieve the subtree under a node.+layoutGetChilds (LayoutFlow _ _ ret) = ret+layoutGetChilds (LayoutGrid _ _ _ ret) = ret+layoutGetChilds (LayoutSpan _ _ _) = []+layoutGetChilds (LayoutInline _ font self _ vals) = map inner $ inlineChildren vals self+ where inner (val, fragment) = LayoutSpan val font fragment+layoutGetChilds (LayoutInline' _ font self _ vals) = map inner $ layoutChildren vals self+ where inner (val, fragment) = LayoutSpan val font fragment+-- | Retrieve the caller-specified data attached to a layout node.+layoutGetInner (LayoutFlow ret _ _) = ret+layoutGetInner (LayoutGrid ret _ _ _) = ret+layoutGetInner (LayoutInline ret _ _ _ _) = ret+layoutGetInner (LayoutInline' ret _ _ _ _) = ret+layoutGetInner (LayoutSpan ret _ _) = ret++-- | map-ready wrapper around `setCellBox` sourcing from a child node.+setCellBox' (child, cell) = setCellBox cell $ layoutGetBox child++-- | Update a (sub)tree to compute & cache minimum legible sizes.+boxMinWidth :: (Zero y, CastDouble y) =>+ Maybe Double -> LayoutItem y Length x -> LayoutItem y Length x+boxMinWidth parent (LayoutFlow val self childs) = LayoutFlow val self' childs'+ where+ self' = self { B.min = mapSizeX (B.mapAuto min') (B.min self) }+ min' = flowMinWidth parent' self childs''+ childs'' = map (mapX' $ lowerLength selfWidth) $ map layoutGetBox childs'+ childs' = map (boxMinWidth $ Just selfWidth) childs+ selfWidth = width $ mapX' (lowerLength parent') self+ parent' = fromMaybe 0 parent+boxMinWidth parent (LayoutGrid val self cells0 childs) = LayoutGrid val self' cells' childs'+ where+ self' = Size (inline self) { trackMins = cells } (block self)+ cells = sizeTrackMins parent' (inline self) $ map inline cells'+ cells' = map setCellBox' $ zip childs' cells0 -- Flatten subgrids+ childs'' = map (mapX' $ lowerLength selfWidth) $ map layoutGetBox childs'+ childs' = map (boxMinWidth $ Just selfWidth) childs+ selfWidth = trackNat (lowerLength parent') $ inline self+ parent' = fromMaybe (gridEstWidth self cells0) parent+ zeroBox :: PaddedBox Double Double+ zeroBox = zero+boxMinWidth _ self@(LayoutInline _ _ _ _ _) = self+boxMinWidth _ self@(LayoutInline' _ _ _ _ _) = self+boxMinWidth _ self@(LayoutSpan _ _ _) = self+-- | Update a (sub)tree to compute & cache ideal width.+boxNatWidth :: (Zero y, CastDouble y) =>+ Maybe Double -> LayoutItem y Length x -> LayoutItem y Length x+boxNatWidth parent (LayoutFlow val self childs) = LayoutFlow val self' childs'+ where+ self' = self { B.nat = Size size' $ block $ B.nat self }+ size' = flowNatWidth parent' self childs''+ childs'' = map (mapX' $ lowerLength selfWidth) $ map layoutGetBox childs'+ childs' = map (boxNatWidth $ Just selfWidth) childs+ selfWidth = width $ mapX' (lowerLength parent') self+ parent' = fromMaybe 0 parent+boxNatWidth parent (LayoutGrid val self cells0 childs) = LayoutGrid val self' cells' childs'+ where+ self' = Size (inline self) { trackNats = cells } (block self)+ cells = sizeTrackNats parent' (inline $ self) $ map inline cells'+ cells' = map setCellBox' $ zip childs' cells0 -- Flatten subgrids+ childs'' = map (mapX' $ lowerLength selfWidth) $ map layoutGetBox childs'+ childs' = map (boxNatWidth $ Just selfWidth) childs+ selfWidth = trackNat (lowerLength parent') $ inline self+ parent' = fromMaybe (gridEstWidth self cells0) parent+ zeroBox :: PaddedBox Double Double+ zeroBox = zero+boxNatWidth _ self@(LayoutInline _ _ _ _ _) = self+boxNatWidth _ self@(LayoutInline' _ _ _ _ _) = self+boxNatWidth _ self@(LayoutSpan _ _ _) = self+-- | Update a (sub)tree to compute & cache maximum legible width.+boxMaxWidth :: CastDouble y => PaddedBox a Double -> LayoutItem y Length x -> LayoutItem y Length x+boxMaxWidth parent (LayoutFlow val self childs) = LayoutFlow val self' childs'+ where+ childs' = map (boxMaxWidth self'') childs+ self'' = mapX' (lowerLength $ inline $ B.size parent) self'+ self' = self { B.max = Size (Pixels max') (block $ B.max self) }+ max' = flowMaxWidth parent self+boxMaxWidth parent (LayoutGrid val self cells childs) = LayoutGrid val self cells childs'+ where -- Propagate parent track as default.+ childs' = map inner $ zip cells childs+ inner (Size cellx celly, child) =+ boxMaxWidth (cellSize (inline self) cellx `size2box` cellSize (block self) celly) child+ size2box x y = zeroBox { B.min = Size x y, B.max = Size x y, B.size = Size x y }+boxMaxWidth parent self@(LayoutInline _ _ _ _ _) = self+boxMaxWidth parent self@(LayoutInline' _ _ _ _ _) = self+boxMaxWidth parent self@(LayoutSpan _ f self') = self+-- | Update a (sub)tree to compute & cache final width.+boxWidth :: (Zero y, CastDouble y) => PaddedBox b Double -> LayoutItem y Length x ->+ LayoutItem y Double x+boxWidth parent (LayoutFlow val self childs) = LayoutFlow val self' childs'+ where+ childs' = map (boxWidth self') childs+ self' = (mapX' (lowerLength $ inline $ size parent) self) {+ size = Size size' $ block $ B.max self+ }+ size' = flowWidth parent self+boxWidth parent (LayoutGrid val self cells childs) = LayoutGrid val self' cells' childs'+ where -- Propagate parent track as default+ (cells', childs') = unzip $ map recurse $ zip cells childs+ recurse (cell, child) = (cell', child')+ where+ cell' = setCellBox cell $ layoutGetBox child'+ child' = boxWidth (gridItemBox self cell) child+ self' = flip Size (block self) Track {+ cells = map Left widths,+ trackMins = trackMins $ inline self, trackNats = trackNats $ inline self,+ gap = lowerLength outerwidth $ gap $ inline self+ }+ outerwidth = inline $ size parent+ widths = sizeTrackMaxs (inline $ size parent) $ inline self+boxWidth parent (LayoutInline val font (Paragraph a b c d) paging vals) =+ LayoutInline val font (Paragraph a b c d { paragraphMaxWidth = round width }) paging vals+ where width = B.inline $ B.size parent+boxWidth _ (LayoutInline' a b c d e) = LayoutInline' a b c d e+boxWidth parent (LayoutSpan val font self') = LayoutSpan val font self'++-- | Update a (sub)tree to compute & cache ideal legible height.+boxNatHeight :: Double -> LayoutItem Length Double x -> LayoutItem Length Double x+boxNatHeight parent (LayoutFlow val self childs) = LayoutFlow val self' childs'+ where+ self' = self { size = mapSizeY (mapAuto size') (size self) }+ size' = flowNatHeight parent self childs''+ childs'' = map (mapY' (lowerLength parent)) $ map layoutGetBox childs'+ childs' = map (boxNatHeight $ inline $ size self) childs+boxNatHeight parent (LayoutGrid val self cells childs) = LayoutGrid val self' cells childs'+ where+ self' = Size (inline self) (block self) { trackNats = heights }+ heights = sizeTrackNats parent (block self) $ map block cells'+ cells' = map setCellBox' $ zip childs' cells -- Flatten subgrids+ childs' = map (boxNatHeight width) childs+ width = trackNat id $ inline self+boxNatHeight parent self@(LayoutInline _ _ _ _ _) = self+boxNatHeight parent self@(LayoutInline' _ _ _ _ _) = self+boxNatHeight parent self@(LayoutSpan _ _ _) = self+-- | Update a (sub)tree to compute & cache minimum legible height.+boxMinHeight :: Double -> LayoutItem Length Double x -> LayoutItem Length Double x+boxMinHeight parent (LayoutFlow val self childs) = LayoutFlow val self' childs'+ where+ childs' = map (boxMinHeight $ inline $ size self) childs+ self' = self { B.min = Size (inline $ B.min self) (Pixels min') }+ min' = flowMinHeight parent self+boxMinHeight parent (LayoutGrid val self cells childs) = LayoutGrid val self' cells' childs'+ where+ (cells', childs') = unzip $ map recurse $ zip cells childs+ recurse (cell, child) = (cell', child') -- Propagate track into subgrids.+ where+ cell' = setCellBox cell (layoutGetBox child')+ child' = boxMinHeight width child+ self' = Size (inline self) (block self) { trackMins = heights }+ heights = sizeTrackMins width (block self) $ map block cells+ width = trackNat id $ inline self+boxMinHeight parent self@(LayoutInline _ _ _ _ _) = self+boxMinHeight _ self@(LayoutInline' _ _ _ _ _) = self+boxMinHeight parent self@(LayoutSpan _ font self') = self+-- | Update a subtree to compute & cache maximum legible height.+boxMaxHeight :: PaddedBox Double Double -> LayoutItem Length Double x ->+ LayoutItem Length Double x+boxMaxHeight parent (LayoutFlow val self childs) = LayoutFlow val self' childs'+ where+ childs' = map (boxMaxHeight $ mapY' (lowerLength width) self') childs+ self' = self { B.max = Size (inline $ B.max self) (Pixels max') }+ max' = flowMaxHeight (inline $ size parent) self+ width = inline $ size self+boxMaxHeight parent (LayoutGrid val self cells childs) = LayoutGrid val self cells' childs'+ where+ (cells', childs') = unzip $ map recurse $ zip cells childs+ recurse (cell, child) = (cell', child') -- Propagate track into subgrids+ where+ cell' = setCellBox cell (layoutGetBox child')+ child' = boxMaxHeight (gridItemBox self cell) child+ heights = sizeTrackMaxs (inline $ size parent) (block self)+ width = inline $ size parent+boxMaxHeight parent (LayoutInline val font self' paging vals) =+ LayoutInline val font self' paging vals+boxMaxHeight parent (LayoutInline' val font self' paging vals) =+ LayoutInline' val font self' paging vals+boxMaxHeight parent (LayoutSpan val font self') = LayoutSpan val font self'+-- | Update a (sub)tree to compute & cache final height.+boxHeight :: PaddedBox Double Double -> LayoutItem Length Double x -> LayoutItem Double Double x+boxHeight parent (LayoutFlow val self childs) = LayoutFlow val self' childs'+ where+ childs' = map (boxHeight self') childs+ self' = (mapY' (lowerLength $ inline $ size parent) self) {+ size = Size (inline $ size self) size'+ }+ size' = flowHeight parent self+ width = inline $ size self+boxHeight parent (LayoutGrid val self cells0 childs) = LayoutGrid val self' cells' childs'+ where+ (cells', childs') = unzip $ map recurse $ zip cells0 childs+ recurse (cell, child) = (cell', child') -- Propagate track into subgrids.+ where+ cell' = setCellBox cell (layoutGetBox child')+ child' = boxHeight (layoutGetBox $ LayoutGrid val self' [] []) child+ self' = Size (inline self) Track {+ gap = lowerLength width $ gap $ block self,+ cells = map lowerSize $ cells $ block self,+ trackMins = trackMins $ block self, trackNats = trackNats $ block self+ }+ heights = sizeTrackMaxs (inline $ size parent) $ block self+ lowerSize (Left x) = Left $ lowerLength width x+ lowerSize (Right x) = Right x+ width = inline $ size parent+boxHeight parent (LayoutInline val font self' paging vals) =+ LayoutInline val font self' paging vals+boxHeight _ (LayoutInline' val font self' paging vals) =+ LayoutInline' val font self' paging vals+boxHeight _ (LayoutSpan val font self') = LayoutSpan val font self'++-- | Split a (sub)tree to fit within max-height.+-- May take full page height into account.+boxSplit :: PropertyParser x => Double -> Double -> LayoutItem Double Double x ->+ (LayoutItem Double Double x, Maybe (LayoutItem Double Double x))+boxSplit maxheight _ node | height (layoutGetBox node) <= maxheight = (node, Nothing)+boxSplit maxheight pageheight (LayoutFlow val self childs)+ | (next:_) <- childs1, ((y,_):_) <- childs0',+ (tail,Just nextpage) <- boxSplit (maxheight - y) pageheight next =+ (LayoutFlow val self {+ size = (size self) { B.block = y }+ } (childs0 ++ [tail]),+ Just $ LayoutFlow val self {+ size = (size self) { B.block = B.block (size self) - y }+ } (nextpage:childs1))+ | otherwise =+ (LayoutFlow val self { size = (size self) { B.block = maxheight } } childs0,+ Just $ LayoutFlow val self childs1) -- TODO recompute height+ where+ childs0 = map snd childs0'+ childs1 = map snd childs1'+ (childs0', childs1') = break overflowed $ inner 0 childs+ overflowed (y, _) = y >= maxheight+ inner start (child:childs) = (start', child):inner start' childs -- TODO margin collapse?+ where start' = start + height (layoutGetBox child)+ inner _ [] = []+boxSplit _ _ self@(LayoutGrid _ _ _ _) = (self, Nothing) -- TODO+boxSplit maxheight pageheight (LayoutInline a b self c d) =+ boxSplit maxheight pageheight $ LayoutInline' a b (layoutPlain self) c d+boxSplit maxheight pageheight (LayoutInline' a b self paging c) =+ case paginate paging {+ pageCurrentHeight = toEnum $ fromEnum maxheight,+ pageNextHeight = toEnum $ fromEnum pageheight+ } self of+ (Continue, self', next) -> (wrap self', wrap <$> next)+ (Break, _, _) -> (nullLayout, Just $ wrap self)+ where+ wrap self' = LayoutInline' a b self' paging c+boxSplit _ _ self@(LayoutSpan _ _ _) = (self, Nothing) -- Can't split!+-- | Generate a list of pages from a node, splitting subtrees where necessary.+boxPaginate pageheight node+ | (page, Just overflow) <- boxSplit pageheight pageheight node =+ page:boxPaginate pageheight overflow+ | otherwise = [node]++-- | Compute position of all nodes in the (sub)tree relative to a base coordinate.+boxPosition :: PropertyParser x => (Double, Double) -> LayoutItem Double Double x ->+ LayoutItem Double Double ((Double, Double), x)+boxPosition pos@(x, y) (LayoutFlow val self childs) = LayoutFlow (pos, val) self childs'+ where+ childs' = map recurse $ zip pos' childs+ recurse ((Size x' y'), child) = boxPosition (x + x', y + y') child+ pos' = positionFlow $ map layoutGetBox childs+boxPosition pos@(x, y) (LayoutGrid val self cells childs) = LayoutGrid (pos, val) self cells childs'+ where+ childs' = map recurse $ zip pos' childs+ recurse ((x', y'), child) = boxPosition (x + x', y + y') child+ pos' = gridPosition self cells+boxPosition pos@(x, y) (LayoutInline val font self paging vals) =+ LayoutInline (pos, val) font self paging $ map (\(x, y) -> (fragmentPos font pos y, x)) $+ inlineChildren vals self+boxPosition pos@(x, y) (LayoutInline' val font self paging vals) =+ LayoutInline' (pos, val) font self paging $ map (\(x, y) -> (fragmentPos font pos y, x)) $+ layoutChildren vals self+boxPosition pos (LayoutSpan val f self) = LayoutSpan (pos, val) f self -- No children...+-- | Compute sizes & position information for all nodes in the (sub)tree.+boxLayout :: PropertyParser x => PaddedBox Double Double -> LayoutItem Length Length x ->+ Bool -> [LayoutItem Double Double ((Double, Double), x)]+boxLayout parent self paginate = self9+ where+ self0 = boxMinWidth Nothing self+ self1 = boxNatWidth Nothing self0+ self2 = boxMaxWidth parent self1+ self3 = boxWidth parent self2+ self4 = boxNatHeight (inline $ size parent) self3+ self5 = boxMinHeight (inline $ size parent) self4+ self6 = boxMaxHeight parent self5+ self7 = boxHeight parent self6+ self8 | paginate = boxPaginate (block $ size parent) self7+ | otherwise = [self7]+ self9 = map (boxPosition (0, 0)) self8++-- | Compute a mapping from a layout tree indicating which glyphs for which fonts+-- are required.+-- Useful for assembling glyph atlases.+glyphsPerFont :: LayoutItem x y z -> M.Map (Pattern, Double) IS.IntSet+glyphsPerFont (LayoutSpan _ font self) =+ (pattern font, fontSize font) `M.singleton` IS.fromList glyphs+ where glyphs = map fromEnum $ map Hb.codepoint $ map fst $ fragmentGlyphs self+glyphsPerFont node = M.unionsWith IS.union $ map glyphsPerFont $ layoutGetChilds node
+ Graphics/Layout/Arithmetic.hs view
@@ -0,0 +1,141 @@+{-# LANGUAGE OverloadedStrings #-}+-- | (Unused) Parses & evaluates calc() expressions.+-- Implemented using The Shunting Yard Algorithm.+module Graphics.Layout.Arithmetic(Opcode(..), parseCalc, verifyCalc,+ evalCalc, mapCalc) where++import Data.CSS.Syntax.Tokens (Token(..), NumericValue(..))+import Data.Scientific (toRealFloat)+import GHC.Real (infinity)+import Data.Text (unpack, Text)+import qualified Data.Text as Txt+import Debug.Trace (trace) -- For error reporting.++-- | Parsed calc() expression. As a postfix arithmatic expression.+data Opcode n = Seq | Add | Subtract | Multiply | Divide | Func Text | Num n deriving Show+-- | Parse a calc() expression.+parseCalc :: [Token] -> [Opcode (Float, String)] -> [Opcode (Float, String)]+parseCalc (Number _ n:toks) stack = Num (val2float n, ""):parseCalc toks stack+parseCalc (Percentage _ n:toks) stack = Num (val2float n, "%"):parseCalc toks stack+parseCalc (Dimension _ n unit:toks) stack =+ Num (val2float n, unpack unit):parseCalc toks stack+parseCalc (Ident "e":toks) stack = Num (exp 1, ""):parseCalc toks stack+parseCalc (Ident "pi":toks) stack = Num (pi, ""):parseCalc toks stack+parseCalc (Ident "infinity":toks) stack = Num (f infinity, ""):parseCalc toks stack+parseCalc (Ident "-infinity":toks) stack =+ Num (negate $ f infinity, ""):parseCalc toks stack+parseCalc (Ident "NaN":toks) stack = Num (0/0, ""):parseCalc toks stack++parseCalc (Function x:toks) stack = parseCalc toks (Func x:stack)+parseCalc (LeftParen:toks) stack = parseCalc toks (Func "calc":stack)+parseCalc toks'@(Delim c:toks) (stack:stacks)+ | prec stack >= prec (op c) = stack:parseCalc toks' stacks+ | otherwise = parseCalc toks (op c:stack:stacks)+ where+ prec :: Opcode n -> Int+ prec Seq = 1+ prec Add = 2+ prec Subtract = 2+ prec Multiply = 3+ prec Divide = 3+ prec (Func _) = 0+ prec (Num _) = error "Unexpected number on operand stack!"+parseCalc (Delim c:toks) [] = parseCalc toks [op c]+parseCalc (Comma:toks) stack = parseCalc (Delim ',':toks) stack+parseCalc (RightParen:toks) (Func "calc":stack) = parseCalc toks stack+parseCalc (RightParen:toks) (op'@(Func _):stack) = op':parseCalc toks stack+parseCalc toks@(RightParen:_) (op':stack) = op':parseCalc toks stack+parseCalc (RightParen:toks) [] = parseCalc toks []+parseCalc [] [] = []+parseCalc [] stack = parseCalc [RightParen] stack+parseCalc _ _ = [Func "invalid"]++-- | Parse an operator char.+op :: Char -> Opcode n+op '+' = Add+op '-' = Subtract+op '*' = Multiply+op '/' = Divide+op ',' = Seq -- For function-calls.+op _ = Func "invalid"++-- Do operands counts line up? Are we dividing by 0?+-- Also I see concerns about whether units line up. Not bothering verifying that.+-- | Verify that a parsed math expression can be properly evaluated.+verifyCalc :: [Opcode (Float, String)] -> [Bool] -> Bool+verifyCalc (Seq:expr) stack = verifyCalc expr stack+verifyCalc (Add:expr) (_:_:stack) = verifyCalc expr (True:stack)+verifyCalc (Subtract:expr) (_:_:stack) = verifyCalc expr (True:stack)+verifyCalc (Multiply:expr) (_:_:stack) = verifyCalc expr (True:stack)+verifyCalc (Divide:_) (False:_) = False+verifyCalc (Divide:expr) (_:_:stack) = verifyCalc expr (True:stack)+verifyCalc (Num (n, _):expr) stack = verifyCalc expr ((n == 0):stack)+verifyCalc (Func x:expr) (_:stack)+ | x `elem` Txt.words "abs acos asin atan cos exp log sign sin sqrt tan" =+ verifyCalc expr (True:stack)+verifyCalc (Func x:expr) (_:_:stack)+ | x `elem` Txt.words "atan2 max min mod pow rem" = verifyCalc expr (True:stack)+verifyCalc (Func "clamp":expr) (_:_:_:stack) = verifyCalc expr (True:stack)+verifyCalc [] [_] = True+verifyCalc _ _ = False++-- | Evaluate a parsed calc() expression.+evalCalc :: [Opcode Float] -> [Float] -> Float+evalCalc (Seq:expr) stack = evalCalc expr stack -- The function args off+evalCalc (Add:expr) (y:x:stack) = evalCalc expr ((x + y):stack)+evalCalc (Subtract:expr) (y:x:stack) = evalCalc expr ((x - y):stack)+evalCalc (Multiply:expr) (y:x:stack) = evalCalc expr ((x*y):stack)+evalCalc (Divide:expr) (y:x:stack) = evalCalc expr ((x/y):stack)+evalCalc (Num n:expr) stack = evalCalc expr (n:stack)++evalCalc (Func "abs":expr) (x:stack) = evalCalc expr (abs x:stack)+evalCalc (Func "acos":expr) (x:stack) = evalCalc expr (acos x:stack)+evalCalc (Func "asin":expr) (x:stack) = evalCalc expr (asin x:stack)+evalCalc (Func "atan":expr) (x:stack) = evalCalc expr (atan x:stack)+evalCalc (Func "atan2":expr) (y:x:stack) = evalCalc expr (atan2 x y:stack)+evalCalc (Func "clamp":expr) (high:x:low:stack) =+ evalCalc expr (min high (max low x):stack)+evalCalc (Func "cos":expr) (x:stack) = evalCalc expr (cos x:stack)+evalCalc (Func "exp":expr) (x:stack) = evalCalc expr (exp x:stack)+evalCalc (Func "log":expr) (x:stack) = evalCalc expr (log x:stack)+evalCalc (Func "max":expr) (y:x:stack) = evalCalc expr (max x y:stack)+evalCalc (Func "min":expr) (y:x:stack) = evalCalc expr (min x y:stack)+evalCalc (Func "mod":expr) (y:x:stack) =+ evalCalc expr (toEnum (round x `mod` round y):stack)+evalCalc (Func "pow":expr) (y:x:stack) = evalCalc expr (x ** y:stack)+evalCalc (Func "rem":expr) (y:x:stack) =+ evalCalc expr (toEnum (round x `rem` round y):stack)+evalCalc (Func "sign":expr) (x:stack) = evalCalc expr (signum x:stack)+evalCalc (Func "sin":expr) (x:stack) = evalCalc expr (sin x:stack)+evalCalc (Func "sqrt":expr) (x:stack) = evalCalc expr (sqrt x:stack)+evalCalc (Func "tan":expr) (x:stack) = evalCalc expr (tan x:stack)++evalCalc [] [ret] = ret+evalCalc [] stack@(ret:_) =+ trace ("Verification should have caught this error! " ++ show stack) ret+evalCalc [] [] = trace "Verification should have caught this error! Stack underflow!" 0+evalCalc (op:_) (ret:_) =+ trace ("Verification should have caught this error! Unsupported op " ++ show op) ret+evalCalc (op:_) [] =+ trace ("Verification should have caught this error! Unsupported op " ++ show op) 0++-- | Convert all numbers in an expression via the given callback.+mapCalc :: (a -> b) -> [Opcode a] -> [Opcode b]+mapCalc cb (Num x:toks) = Num (cb x):mapCalc cb toks+-- GHC demanded more verbosity...+mapCalc cb (Seq:toks) = mapCalc cb toks -- we can drop these while we're at it...+mapCalc cb (Add:toks) = Add:mapCalc cb toks+mapCalc cb (Subtract:toks) = Subtract:mapCalc cb toks+mapCalc cb (Multiply:toks) = Multiply:mapCalc cb toks+mapCalc cb (Divide:toks) = Divide:mapCalc cb toks+mapCalc cb (Func f':toks) = Func f':mapCalc cb toks+mapCalc _ [] = []++-- | Convert from a tokenized NumericValue to a Float.+val2float :: NumericValue -> Float+val2float (NVInteger n) = fromIntegral n+val2float (NVNumber n) = toRealFloat n++-- | Convert from a rational value to a float.+f :: Rational -> Float+f = fromRational
+ Graphics/Layout/Box.hs view
@@ -0,0 +1,164 @@+{-# LANGUAGE RecordWildCards #-}+-- | Datastructures representing the CSS box model,+-- & utilities for operating on them.+module Graphics.Layout.Box(Border(..), mapX, mapY,+ Size(..), mapSizeX, mapSizeY,+ PaddedBox(..), zeroBox, lengthBox, mapX', mapY',+ width, height, minWidth, minHeight, maxWidth, maxHeight,+ Length(..), mapAuto, lowerLength, Zero(..), CastDouble(..)) where++-- | Amount of space surrounding the box.+data Border m n = Border {+ top :: m, bottom :: m, left :: n, right :: n+}+-- | Convert horizontal spacing via given callback.+mapX :: (n -> nn) -> Border m n -> Border m nn+-- | Convert vertical spacing via given callback.+mapY :: (m -> mm) -> Border m n -> Border mm n+mapX cb self = self { left = cb $ left self, right = cb $ right self }+mapY cb self = self { top = cb $ top self, bottom = cb $ bottom self }++-- | 2D size of a box. Typically inline is width & block is height.+-- This may change as support for vertical layout is added.+data Size m n = Size {inline :: n, block :: m} deriving (Eq, Show)+-- | Convert inline size via given callback+mapSizeY :: (m -> mm) -> Size m n -> Size mm n+mapSizeY cb self = Size (inline self) (cb $ block self)+-- | Convert block size via given callback+mapSizeX :: (n -> nn) -> Size m n -> Size m nn+mapSizeX cb self = Size (cb $ inline self) (block self)++-- | A box with min & max bounds & surrounding borders. The CSS Box Model.+data PaddedBox m n = PaddedBox {+ -- | The minimum amount of pixels this box should take.+ min :: Size m n,+ -- | The maximum amount of pixels this box should take.+ max :: Size m n,+ -- | The ideal number of pixels this box should take.+ nat :: Size Double Double,+ -- | The amount of pixels this box should take.+ size :: Size m n,+ -- | The amount of space between the box & the border.+ padding :: Border m n,+ -- | The amount of space for the border.+ border :: Border m n,+ -- | The amount of space between the border & anything else.+ margin :: Border m n+}+-- | An empty box, takes up nospace onscreen.+zeroBox :: PaddedBox Double Double+zeroBox = PaddedBox {+ min = Size 0 0,+ max = Size 0 0,+ nat = Size 0 0,+ size = Size 0 0,+ padding = Border 0 0 0 0,+ border = Border 0 0 0 0,+ margin = Border 0 0 0 0+ }+-- | A box which takes up all available space with no borders.+lengthBox :: PaddedBox Length Length+lengthBox = PaddedBox {+ min = Size Auto Auto,+ max = Size Auto Auto,+ nat = Size 0 0,+ size = Size Auto Auto,+ padding = Border zero zero zero zero,+ border = Border zero zero zero zero,+ margin = Border zero zero zero zero+ }++-- | Convert all sizes along the inline axis via given callback.+mapX' :: (n -> nn) -> PaddedBox m n -> PaddedBox m nn+mapX' cb PaddedBox {..} = PaddedBox {+ min = Size (cb $ inline min) (block min),+ size = Size (cb $ inline size) (block size),+ nat = Size 0 0,+ max = Size (cb $ inline max) (block max),+ padding = mapX cb padding,+ border = mapX cb border,+ margin = mapX cb margin+ }+-- | Convert all sizes along the block axis via given callback.+mapY' :: (m -> mm) -> PaddedBox m n -> PaddedBox mm n+mapY' cb PaddedBox {..} = PaddedBox {+ min = Size (inline min) (cb $ block min),+ size = Size (inline size) (cb $ block size),+ nat = Size 0 0,+ max = Size (inline max) (cb $ block max),+ padding = mapY cb padding,+ border = mapY cb border,+ margin = mapY cb margin+ }++-- | The total size along the inline axis including borders, etc.+width PaddedBox {..} = left margin + left border + left padding ++ inline size + right padding + right border + right margin+-- | The total size along the block axis, including borders, etc.+height PaddedBox {..} = top margin + top border + top padding ++ block size + bottom padding + bottom border + bottom margin+-- | The total minimum size along the inline axis.+minWidth PaddedBox {..} = left margin + left border + left padding ++ inline min + right padding + right border + right margin+-- | The total minimum size along the block axis.+minHeight PaddedBox {..} = top margin + top border + top padding ++ block min + bottom padding + bottom border + bottom margin+-- | The total maximum size along the inline axis.+maxWidth PaddedBox {..} = left margin + left border + left padding ++ inline max + right padding + right border + right margin+-- | The total maximum size along the block axis.+maxHeight PaddedBox {..} = top margin + top border + top padding ++ block max + bottom padding + bottom border + bottom margin++-- | A partially-computed length value.+data Length = Pixels Double -- ^ Absolute number of device pixels.+ | Percent Double -- ^ Multiplier by container width.+ | Auto -- ^ Use normal layout computations.+ | Preferred -- ^ Use computed preferred width.+ | Min -- ^ Use minimum legible width.+ deriving Eq++-- | Convert a length given the container's width. Filling in 0 for keywords.+-- If you wish for keywords to be handled differently, callers need to compute+-- that themselves.+lowerLength :: Double -> Length -> Double+lowerLength _ (Pixels x) = x+lowerLength outerwidth (Percent x) = x * outerwidth+lowerLength _ _ = 0++-- | Replace keywords with a given number of pixels.+-- Useful for avoiding messing up percentage calculations in later processing.+mapAuto x Auto = Pixels x+mapAuto x Preferred = Pixels x+mapAuto x Min = Pixels x+mapAuto _ x = x++class Zero a where+ -- | Return the empty (or zero) value for a CatTrap geometric type.+ zero :: a++instance Zero Double where zero = 0+instance Zero Length where zero = Pixels 0+instance (Zero m, Zero n) => Zero (PaddedBox m n) where+ zero = PaddedBox {+ min = Size zero zero,+ max = Size zero zero,+ nat = Size 0 0,+ size = Size zero zero,+ padding = Border zero zero zero zero,+ border = Border zero zero zero zero,+ margin = Border zero zero zero zero+ }++class CastDouble a where+ -- | Convert a double to a double or length.+ fromDouble :: Double -> a+ -- | Convert a double or length to a double.+ toDouble :: a -> Double++instance CastDouble Double where+ fromDouble = id+ toDouble = id+instance CastDouble Length where+ fromDouble = Pixels+ toDouble = lowerLength 0
+ Graphics/Layout/CSS.hs view
@@ -0,0 +1,295 @@+{-# LANGUAGE OverloadedStrings #-}+-- | Parses & desugars CSS properties to general CatTrap datastructures.+module Graphics.Layout.CSS(CSSBox(..), BoxSizing(..), Display(..),+ finalizeCSS, finalizeCSS') where++import Data.CSS.Syntax.Tokens (Token(..), NumericValue(..))+import qualified Data.Text as Txt+import Stylist (PropertyParser(..), TrivialPropertyParser)+import Stylist.Tree (StyleTree(..))+import Data.Text.ParagraphLayout (PageOptions(..))++import Graphics.Layout.Box as B+import Graphics.Layout+import Graphics.Text.Font.Choose (Pattern(..), unset)+import Graphics.Layout.CSS.Length+import Graphics.Layout.CSS.Font+import Graphics.Layout.Grid.CSS+import Graphics.Layout.Inline.CSS++-- | Parsed CSS properties relevant to layout.+data CSSBox a = CSSBox {+ -- | Which layout formula to use, a.k.a. parsed CSS display property.+ display :: Display,+ -- | (Unused) Parsed CSS box-sizing+ boxSizing :: BoxSizing,+ -- | sizing, margins, border-width, & padding CSS properties.+ -- Stores units in case they're needed for font-related units.+ cssBox :: PaddedBox Unitted Unitted, -- calc()?+ -- | Query parameters describing desired font.+ font :: Pattern,+ -- | Additional font-related CSS properties.+ font' :: CSSFont,+ -- | Caller-specified data, to parse additional CSS properties.+ inner :: a,+ -- | Grid-related CSS properties.+ gridStyles :: CSSGrid,+ -- | Grid item related CSS properties.+ cellStyles :: CSSCell,+ -- | inline-related CSS properties.+ inlineStyles :: CSSInline,+ -- | Parsed CSS caption-side.+ captionBelow :: Bool,+ -- | Parsed widows & orphans controlling pagination.+ pageOptions :: PageOptions+}+-- | Possible values for CSS box-sizing.+data BoxSizing = BorderBox | ContentBox+-- | Empty border, to use as default value.+noborder = Border (0,"px") (0,"px") (0,"px") (0,"px")++-- | Possibly values for CSS display property.+data Display = Block | Grid | Inline | Table | None |+ TableRow | TableHeaderGroup | TableRowGroup | TableFooterGroup | TableCell |+ TableColumn | TableColumnGroup | TableCaption deriving Eq+-- | Can the display value contain table-rows?+rowContainer CSSBox { display = d } =+ d `elem` [Table, TableHeaderGroup, TableRowGroup, TableFooterGroup]++instance PropertyParser a => PropertyParser (CSSBox a) where+ temp = CSSBox {+ boxSizing = ContentBox,+ display = Inline,+ cssBox = PaddedBox {+ B.min = Size auto auto,+ size = Size auto auto,+ nat = Size 0 0,+ 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,+ pageOptions = PageOptions 0 0 2 2+ }+ inherit parent = CSSBox {+ boxSizing = boxSizing parent,+ display = Inline,+ 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,+ pageOptions = pageOptions 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 "none"] = Just self { display = None }+ 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 = Inline }++ 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 _ self "orphans" [Number _ (NVInteger x)] =+ Just self { pageOptions = (pageOptions self) { pageOrphans = fromInteger x } }+ longhand _ self "widows" [Number _ (NVInteger x)] =+ Just self { pageOptions = (pageOptions self) { pageWidows = fromInteger x } }++ 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++-- | Desugar parsed CSS into more generic layout parameters.+finalizeCSS :: PropertyParser x => Font' -> Font' -> StyleTree (CSSBox x) ->+ LayoutItem Length Length x+finalizeCSS root parent StyleTree { style = self'@CSSBox { display = None } } =+ LayoutFlow (inner self') lengthBox []+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)+ (finalizeChilds 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 = 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_) (finalizeChilds root font_ val 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++-- | Desugar a sequence of child nodes, taking care to capture runs of inlines.+finalizeChilds :: PropertyParser x => Font' -> Font' -> x -> [StyleTree (CSSBox x)] ->+ [LayoutItem Length Length x]+finalizeChilds root parent style' (StyleTree { style = CSSBox { display = None } }:childs) =+ finalizeChilds root parent style' childs+finalizeChilds root parent style' childs@(child:childs')+ | isInlineTree childs, Just self <- finalizeParagraph (flattenTree childs) parent =+ -- FIXME propagate display properties, how to handle the hierarchy.+ -- NOTE: Playing around in firefox, it appears the CSS borders should cover+ -- their entire span, doubling up on borders where needed.+ [LayoutInline (inherit style') parent self paging (repeat $ inherit style')]+ | (inlines@(_:_), blocks) <- spanInlines childs,+ Just self <- finalizeParagraph (flattenTree inlines) parent =+ LayoutInline (inherit style') parent self paging (repeat $ inherit style') :+ finalizeChilds root parent style' blocks+ | (StyleTree { style = CSSBox { display = Inline } }:childs') <- childs =+ finalizeChilds root parent style' childs' -- Inline's all whitespace...+ | otherwise = finalizeCSS root parent child : finalizeChilds root parent style' childs'+ where+ paging = pageOptions $ style child+ isInlineTree = all isInlineTree0+ 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 _ _ _ [] = []++-- | Desugar most units, possibly in reference to given font.+finalizeBox self@CSSBox { cssBox = box } font_ =+ mapY' (flip finalizeLength font_) $ mapX' (flip finalizeLength font_) box++-- | (Unused, incomplete) Desugar a styletree of table elements to a grid layout.+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 ) =+ -}
+ Graphics/Layout/CSS/Font.hs view
@@ -0,0 +1,228 @@+{-# LANGUAGE OverloadedStrings #-}+-- | Infrastructure for parsing & desugaring CSS properties related to fonts.+module Graphics.Layout.CSS.Font(Font'(..), placeholderFont, hbScale, hbUnit,+ pattern2hbfont, pattern2font, CSSFont(..), variations') where++import Data.CSS.Syntax.Tokens (Token(..), NumericValue(..), serialize)+import Stylist (PropertyParser(..))+import qualified Data.Text as Txt+import Data.Maybe (fromMaybe)++import Graphics.Layout.Box+import Graphics.Layout.CSS.Length++import Data.Text.Glyphize as HB+import Graphics.Text.Font.Choose (Pattern(..), Value(..), normalizePattern,+ getValue', getValue0, setValue, Binding(..),+ configSubstitute', defaultSubstitute,+ fontSort', MatchKind(..), fontRenderPrepare')+import qualified Data.ByteString as B+import System.IO.Unsafe (unsafePerformIO)++-- | zero'd `Font'` to serve as the root's parent in a font heirarchy.+placeholderFont = Font' undefined [] (const 0) (const 0) 0 0 0 0 0 0 0 0 1+-- | Scale-factor for text-shaping APIs.+hbScale :: Font' -> Double+hbScale f = fontSize f*hbUnit+-- | Magic number informing the value of `hbScale`.+hbUnit = 64 :: Double++-- | Convert from FontConfig query result to a Harfbuzz font.+pattern2hbfont :: Pattern -> Int -> [Variation] -> Font+pattern2hbfont pat scale variations = createFontWithOptions options face+ where+ bytes = unsafePerformIO $ B.readFile $ getValue0 "file" pat+ face = createFace bytes $ toEnum $ fromMaybe 0 $ getValue' "index" pat+ options = foldl value2opt defaultFontOptions { optionScale = Just (scale, scale) } $+ normalizePattern pat++ value2opt opts ("slant", (_, ValueInt x):_) = opts {+ optionSynthSlant = Just $ realToFrac x+ }+ value2opt opts ("fontvariations", _:_) = opts {optionVariations = variations}+ value2opt opts _ = opts++-- | Convert Parsed CSS to a `Font'`.+-- Includes sizing parameters derived from a root & parent `Font'`.+pattern2font :: Pattern -> CSSFont -> Font' -> Font' -> Font'+pattern2font pat styles@CSSFont { cssFontSize = (x,"initial") } parent root =+ pattern2font pat styles { cssFontSize = (x*fontSize root," ") } parent root+pattern2font pat styles parent root = Font' {+ hbFont = font',+ pattern = font,+ fontHeight = height' . fontGlyphExtents font' . fontGlyph',+ fontAdvance = fromIntegral . fontGlyphHAdvance font' . fontGlyph',+ fontSize = fontSize',+ rootEm = fontSize root,+ lineheight = lineheight',+ rlh = lineheight root,++ vh = vh root,+ vw = vw root,+ vmax = vmax root,+ vmin = vmin root,+ scale = scale root+ } where+ height' (Just x) = fromIntegral $ HB.height x+ height' Nothing = fontSize'+ lineheight' | snd (cssLineheight styles) == "normal",+ Just extents <- fontHExtents font' = (fromIntegral $ lineGap extents)/scale'+ | otherwise = lowerLength' (cssLineheight styles) parent+ fontSize' = lowerLength' (cssFontSize styles) parent+ lowerLength' a = lowerLength (fontSize parent) . finalizeLength a+ fontGlyph' ch = fromMaybe 0 $ fontGlyph font' ch Nothing+ q | Nothing <- lookup "family" pat, Just val <- lookup "family" $ pattern root =+ ("family", val):setValue "size" Weak (px2pt root fontSize') pat+ | otherwise = setValue "size" Weak (px2pt root fontSize') pat+ font = case fontSort' (defaultSubstitute $ configSubstitute' q MatchPattern) False of+ Just (font:_, _) -> fontRenderPrepare' q font+ _ -> error "TODO: Set fallback font!"+ font' = pattern2hbfont font (round scale') $ variations' fontSize' styles+ scale' = fontSize'*hbUnit++-- | Parsed CSS font properties, excluding the FontConfig query.+data CSSFont = CSSFont {+ -- | Parsed CSS font-size.+ cssFontSize :: Unitted,+ -- | Parsed CSS line-height.+ cssLineheight :: Unitted,+ -- | Parsed CSS font-variation-settings.+ variations :: [Variation],+ -- | Parsed CSS font-weight.+ weightVariation :: Variation,+ -- | Parsed CSS font-stretch.+ widthVariation :: Variation,+ -- | Parsed CSS font-style.+ slantVariation :: Variation,+ -- | Parsed CSS font-optical-sizing.+ opticalSize :: Bool+}+-- | All font-variations from the parsed CSS properties.+-- | Requires the resolved font-size in case font-optical-sizing is set.+variations' :: Double -> CSSFont -> [Variation]+variations' fontsize self =+ (if opticalSize self then (Variation opsz (realToFrac fontsize):) else id)+ (slantVariation self:widthVariation self:weightVariation self:variations self)++-- | Represents a multiple of the initial font-size.+-- Resolved by `pattern2font`.+fracDefault :: CSSFont -> Double -> Maybe CSSFont+fracDefault self frac = Just self {+ cssFontSize = (frac,"initial")+}+instance PropertyParser CSSFont where+ temp = CSSFont {+ cssFontSize = (12,"pt"),+ cssLineheight = (1,""),+ variations = [],+ weightVariation = Variation wght 400,+ widthVariation = Variation wdth 100,+ slantVariation = Variation ital 0,+ opticalSize = True+ }+ inherit parent = parent++ longhand _ self "font-size" [Ident "xx-small"] = fracDefault self $ 3/5+ longhand _ self "font-size" [Ident "x-small"] = fracDefault self $ 3/4+ longhand _ self "font-size" [Ident "small"] = fracDefault self $ 8/9+ longhand _ self "font-size" [Ident "medium"] = fracDefault self 1+ longhand _ self "font-size" [Ident "initial"] = fracDefault self 1+ longhand _ self "font-size" [Ident "large"] = fracDefault self $ 6/5+ longhand _ self "font-size" [Ident "x-large"] = fracDefault self $ 3/2+ longhand _ self "font-size" [Ident "xx-large"] = fracDefault self 2+ longhand _ self "font-size" [Ident "xxx-large"] = fracDefault self 3+ longhand parent self "font-size" [Ident "larger"] =+ Just self { cssFontSize = (x*1.2,unit) }+ where (x,unit) = cssFontSize parent+ longhand parent self "font-size" [Ident "smaller"] =+ Just self { cssFontSize = (x/1.2,unit) }+ where (x, unit) = cssFontSize parent+ longhand _ self "font-size" toks+ | Just x <- parseLength toks = Just self { cssFontSize = x }++ longhand _ self "line-height" [Ident "normal"] = Just self { cssLineheight = (0,"normal") }+ longhand _ self "line-height" [Number _ x] = Just self { cssLineheight = (n2f x,"em") }+ longhand _ self "line-height" toks+ | Just x <- parseLength toks = Just self { cssLineheight = x }++ longhand _ self "font-variation-settings" [Ident "normal"] = Just self { variations = [] }+ longhand _ self "font-variation-settings" [Ident "initial"] = Just self {variations = []}+ longhand _ self "font-variation-settings" toks+ | Just x <- parseVariations toks = Just self { variations = x }++ longhand _ self "font-weight" [Ident "normal"] =+ Just self { weightVariation = Variation wght 400 }+ longhand _ self "font-weight" [Ident "initial"] =+ Just self { weightVariation = Variation wght 400 }+ longhand _ self "font-weight" [Ident "bold"] =+ Just self { weightVariation = Variation wght 700 }+ longhand _ self "font-weight" [Number _ (NVInteger x)] | x >= 100 && x < 1000 =+ Just self { weightVariation = Variation wght $ fromIntegral x }+ longhand parent self "font-weight" [Ident "bolder"]+ | varValue (weightVariation parent) < 400 =+ Just self { weightVariation = Variation wght 400 }+ | varValue (weightVariation parent) < 600 =+ Just self { weightVariation = Variation wght 700 }+ | otherwise = Just self { weightVariation = Variation wght 900 }+ longhand parent self "font-weight" [Ident "lighter"]+ | varValue (weightVariation parent) < 600 =+ Just self { weightVariation = Variation wght 100 }+ | varValue (weightVariation parent) < 800 =+ Just self { weightVariation = Variation wght 400 }+ | otherwise = Just self { weightVariation = Variation wght 700 }++ longhand _ self "font-stretch" [Ident "ultra-condensed"] =+ Just self { widthVariation = Variation wdth 50 }+ longhand _ self "font-stretch" [Ident "extra-condensed"] =+ Just self { widthVariation = Variation wdth 62.5 }+ longhand _ self "font-stretch" [Ident "condensed"] =+ Just self { widthVariation = Variation wdth 75 }+ longhand _ self "font-stretch" [Ident "semi-condensed"] =+ Just self { widthVariation = Variation wdth 87.5 }+ longhand _ self "font-stretch" [Ident k] | k `elem` ["initial", "normal"] =+ Just self { widthVariation = Variation wdth 100 }+ longhand _ self "font-stretch" [Ident "semi-expanded"] =+ Just self { widthVariation = Variation wdth 112.5 }+ longhand _ self "font-stretch" [Ident "expanded"] =+ Just self { widthVariation = Variation wdth 125 }+ longhand _ self "font-stretch" [Ident "extra-expanded"] =+ Just self { widthVariation = Variation wdth 150 }+ longhand _ self "font-stretch" [Ident "ultra-expanded"] =+ Just self { widthVariation = Variation wdth 200 }+ longhand _ self "font-stretch" [Percentage _ x] =+ Just self { widthVariation = Variation wdth $ n2f x }++ longhand _ self "font-style" [Ident "oblique", Dimension _ x "deg"] =+ Just self { slantVariation = Variation slnt $ n2f x }+ longhand _ self "font-style" [Ident "oblique", Dimension _ x "grad"] =+ Just self { slantVariation = Variation slnt (n2f x/400*360) }+ longhand _ self "font-style" [Ident "oblique", Dimension _ x "rad"] =+ Just self { slantVariation = Variation slnt (n2f x*180/pi) }+ longhand _ self "font-style" [Ident "oblique", Dimension _ x "turn"] =+ Just self { slantVariation = Variation slnt (n2f x*360) }+ longhand _ self "font-style" [Ident "italic"] =+ Just self { slantVariation = Variation ital 1 }+ longhand _ self "font-style" [Ident "normal"] =+ Just self { slantVariation = Variation ital 0 }+ longhand _ self "font-style" [Ident "initial"] =+ Just self { slantVariation = Variation ital 0 }++ longhand _ s "font-optical-sizing" [Ident "auto"] = Just s {opticalSize = True}+ longhand _ s "font-optical-sizing" [Ident "initial"] = Just s {opticalSize = True}+ longhand _ s "font-optical-sizing" [Ident "none"] = Just s {opticalSize = False}++ longhand _ _ _ _ = Nothing++-- | Utility for parsing multiple font variations (via Harfbuzz).+parseVariations (x@(String _):y@(Number _ _):Comma:toks)+ | Just var <- parseVariation $ Txt.unpack $ serialize [x, y],+ Just vars <- parseVariations toks = Just $ var:vars+parseVariations toks@[String _, Number _ _]+ | Just var <- parseVariation $ Txt.unpack $ serialize toks = Just [var]+parseVariations _ = Nothing++wght = tag_from_string "wght"+wdth = tag_from_string "wdth"+slnt = tag_from_string "slnt"+ital = tag_from_string "ital"+opsz = tag_from_string "opsz"
+ Graphics/Layout/CSS/Length.hs view
@@ -0,0 +1,106 @@+{-# LANGUAGE OverloadedStrings #-}+-- | Infrastructure for parsing & desugaring length units & keywords,+-- in reference to the selected font.+module Graphics.Layout.CSS.Length(Unitted, auto, parseLength, parseLength',+ n2f, finalizeLength, px2pt, Font'(..)) where++import Data.CSS.Syntax.Tokens (Token(..), NumericValue(..))+import qualified Data.Text as Txt+import Data.Scientific (toRealFloat)+import Debug.Trace (trace) -- For warnings.+import Data.Text.Glyphize (Font)+import Graphics.Text.Font.Choose (Pattern(..))++import Graphics.Layout.Box++-- | A number+unit, prior to resolving side units.+-- The unit may alternately represent a keyword, in which case the number is+-- ignored & typically set to 0.+type Unitted = (Double, Txt.Text)+-- | The CSS `auto` keyword.+auto :: Unitted+auto = (0,"auto")++-- | Parse a pre-tokenized CSS length value.+parseLength :: [Token] -> Maybe Unitted+parseLength [Percentage _ x] = Just (n2f x,"%")+parseLength [Dimension _ x unit]+ | n2f x == 0 && unit == "" = Just (0,"px")+ | unit `elem` units = Just (n2f x,unit)+parseLength [Ident "auto"] = Just (0,"auto")+parseLength [Ident "initial"] = Just (0,"auto")+parseLength _ = Nothing+-- | Variant of `parseLength` which supports min-content & max-content keywords.+parseLength' [Ident "min-content"] = Just (0,"min-content")+parseLength' [Ident "max-content"] = Just (0,"max-content")+parseLength' toks = parseLength toks++-- | Supported length units.+units = Txt.words "cap ch em ex ic lh rem rlh vh vw vmax vmin px cm mm Q in pc pt %"++-- | Convert a lexed number to a Double.+n2f :: (Fractional x, RealFloat x) => NumericValue -> x+n2f (NVInteger x) = realToFrac x+n2f (NVNumber x) = toRealFloat x++-- | Resolve a parsed length according to the sizing parameters in a given `Font'`.+finalizeLength :: Unitted -> Font' -> Length+finalizeLength (x,"cap") f = Pixels $ x*fontHeight f 'A'+finalizeLength (x,"ch") f = Pixels $ x*fontAdvance f '0'+finalizeLength (x,"em") f = Pixels $ x*fontSize f+finalizeLength (x,"") f = Pixels $ x*fontSize f -- For line-height.+finalizeLength (x,"ex") f = Pixels $ x*fontHeight f 'x'+finalizeLength (x,"ic") f = Pixels $ x*fontHeight f '水' -- CJK water ideograph+finalizeLength (x,"lh") f = Pixels $ x*lineheight f+finalizeLength (x,"rem") f = Pixels $ x*rootEm f+finalizeLength (x,"rlh") f = Pixels $ x*rlh f+finalizeLength (x,"vh") f = Pixels $ x*vh f+finalizeLength (x,"vw") f = Pixels $ x*vw f+finalizeLength (x,"vmax") f = Percent $ x*vmax f+finalizeLength (x,"vmin") f = Percent $ x*vmin f+finalizeLength (x,"px") f = Pixels $ x*scale f+finalizeLength (x,"cm") f = Pixels $ x*scale f*96/2.54+finalizeLength (x,"in") f = Pixels $ x*96*scale f+finalizeLength (x,"mm") f | Pixels x' <- finalizeLength (x,"cm") f = Pixels $ x'/10+finalizeLength (x,"Q") f | Pixels x' <- finalizeLength (x,"cm") f = Pixels $ x'/40+finalizeLength (x,"pc") f | Pixels x' <- finalizeLength (x,"in") f = Pixels $ x'/6+finalizeLength (x,"pt") f | Pixels x' <- finalizeLength (x,"in") f = Pixels $ x'/72+finalizeLength (x,"%") _ = Percent $ x/100+finalizeLength (_,"auto") _ = Auto+finalizeLength (_,"min-content") _ = Min+finalizeLength (_,"max-content") _ = Preferred+finalizeLength (x, " ") _ = Pixels x -- Internal constant value...+finalizeLength (_,unit) _ = trace ("Invalid unit " ++ Txt.unpack unit) $ Pixels 0+-- | Convert from a computed length to the "pt" unit.+px2pt f x = x / scale f / 96 * 72++-- | A Harfbuzz font with sizing parameters.+data Font' = Font' {+ -- | The Harfbuzz font used to shape text & query character-size information.+ hbFont :: Font,+ -- | The FontConfig query result. Useful to incorporate into output rendering.+ pattern :: Pattern,+ -- | Query the height of a character.+ -- Used for cap, ex, or ic units.+ fontHeight :: Char -> Double,+ -- | Query the width of a character, used for ch unit.+ fontAdvance :: Char -> Double,+ -- | The desired font-size, used for em unit.+ fontSize :: Double,+ -- | The root font's size, used for rem unit.+ rootEm :: Double,+ -- | The desired line-height, used for lh unit.+ lineheight :: Double,+ -- | The root font's line-height, used for rlh unit.+ rlh :: Double,+ -- | Scale-factor for vh unit.+ vh :: Double,+ -- | Scale-factor for vw unit.+ vw :: Double,+ -- | Scale-factor for vmax unit.+ vmax :: Double,+ -- | Scale-factor for vmin unit.+ vmin :: Double,+ -- | How many device pixels in a CSS px?+ scale :: Double+}
+ Graphics/Layout/Flow.hs view
@@ -0,0 +1,148 @@+-- | Sizes a block element & positions their children.+-- Taking into account size bounds.+module Graphics.Layout.Flow(flowMinWidth, flowNatWidth, flowMaxWidth, flowWidth,+ flowNatHeight, flowMinHeight, flowMaxHeight, flowHeight,+ positionFlow, layoutFlow) where++import Graphics.Layout.Box as B++-- | Compute the minimum width of a block element with children of the given sizes.+flowMinWidth :: Double -> PaddedBox a Length -> [PaddedBox b Double] -> Double+flowMinWidth _ PaddedBox {B.min = Size (Pixels x) _} _ = x+flowMinWidth parent PaddedBox {B.min = Size (Percent x) _} _ = x * parent+flowMinWidth parent self@PaddedBox {B.min = Size Preferred _} childs =+ flowNatWidth parent self childs+flowMinWidth _ _ childs = maximum $ (0:) $ map minWidth childs+-- | Compute the natural width of a block element with children of the given sizes.+flowNatWidth :: Double -> PaddedBox a Length -> [PaddedBox b Double] -> Double+flowNatWidth _ PaddedBox {size = Size (Pixels x) _} _ = x+flowNatWidth parent PaddedBox {size = Size (Percent x) _} _ = x * parent+flowNatWidth parent self@PaddedBox {size = Size Min _, B.min = Size x _} childs+ -- Avoid infinite loops!+ | x /= Preferred = flowMinWidth parent self childs+flowNatWidth parent _ childs = maximum $ (0:) $ map maxWidth childs+-- | Compute the maximum width of a block element inside the given parent size.+flowMaxWidth :: PaddedBox a Double -> PaddedBox b Length -> Double+flowMaxWidth _ PaddedBox {B.max = Size (Pixels x) _} = x+flowMaxWidth parent PaddedBox {B.max = Size (Percent x) _} = x * (inline $ size parent)+flowMaxWidth parent self@PaddedBox {B.max = Size Auto _} = inline (size parent) - ws+ where+ ws = l2d (left $ margin self) + l2d (left $ border self) + l2d (left $ padding self) ++ l2d (right $ padding self) + l2d (right $ border self) + l2d (right $ margin self)+ l2d = lowerLength $ inline $ size parent+flowMaxWidth parent self@PaddedBox {B.max = Size Preferred _} =+ flowNatWidth (inline $ size parent) self []+flowMaxWidth parent self@PaddedBox {B.max = Size Min _} =+ flowMinWidth (inline $ B.min parent) self []+-- | Compute final block element width based on cached width computations &+-- parent size.+flowWidth :: PaddedBox a Double -> PaddedBox b Length -> Double+flowWidth parent self+ | small > large = small+ | natural > large = large+ | inline (size self) == Auto = large -- specialcase+ | natural >= small = natural+ | otherwise = small+ where+ small = flowMinWidth (inline $ B.min parent) self []+ natural = flowNatWidth (inline $ size parent) self []+ large = flowMaxWidth parent self++-- | Compute natural block element height at cached width.+flowNatHeight :: Double -> PaddedBox Length Double -> [PaddedBox Double Double] -> Double+flowNatHeight _ PaddedBox {size = Size _ (Pixels y)} _ = y+flowNatHeight parent PaddedBox {size = Size _ (Percent y)} _ = y * parent+flowNatHeight _ PaddedBox {size = Size _ Min} childs =+ sum $ map minHeight $ marginCollapse childs+flowNatHeight _ PaddedBox {size = Size owidth _} childs =+ sum $ map height $ marginCollapse childs+-- | Compute minimum block height at cached width.+flowMinHeight :: Double -> PaddedBox Length Double -> Double+flowMinHeight _ PaddedBox {B.min = Size _ (Pixels y)} = y+flowMinHeight parent PaddedBox {B.min = Size _ (Percent y)} = y * parent+flowMinHeight parent self = flowNatHeight parent self []+-- | Compute maximum block height at cached width.+flowMaxHeight :: Double -> PaddedBox Length Double -> Double+flowMaxHeight _ PaddedBox {B.max = Size _ (Pixels y)} = y+flowMaxHeight parent PaddedBox {B.max = Size _ (Percent y)} = y * parent+flowMaxHeight parent PaddedBox {B.max = Size _ Auto} = parent+flowMaxHeight parent self@PaddedBox {B.max = Size _ Preferred} = flowNatHeight parent self []+flowMaxHeight parent self@PaddedBox {B.max = Size _ Min} = flowMinHeight parent self+-- | Compute final block height at cached width.+flowHeight :: PaddedBox Double Double -> PaddedBox Length Double -> Double+flowHeight parent self+ | small > large = small+ | natural > large = large+ | natural >= small = natural+ | otherwise = small+ where+ small = flowMinHeight (block $ B.min parent) self+ natural = flowNatHeight (block $ B.nat parent) self []+ large = flowMaxHeight (block $ B.max parent) self++-- | Compute position of all children relative to this block element.+positionFlow :: [PaddedBox Double Double] -> [Size Double Double]+positionFlow childs = scanl inner (Size 0 0) $ marginCollapse childs+ where inner (Size x y) self = Size x $ height self+-- | Compute size given block element in given parent,+-- & position of given children.+layoutFlow :: PaddedBox Double Double -> PaddedBox Length Length ->+ [PaddedBox Length Double] ->+ (PaddedBox Double Double, [(Size Double Double, PaddedBox Double Double)])+layoutFlow parent self childs = (self', zip positions' childs')+ where+ positions' = positionFlow childs'+ childs' = map layoutZooko childs+ self' = self0 {+ B.min = (B.min self0) { block = flowMinHeight (block $ B.min parent) self0 },+ size = (size self0) { block = flowHeight parent self0 },+ B.max = (B.max self0) { block = flowMaxHeight (block $ B.max parent) self0 },+ padding = mapY (lowerLength owidth) $ padding self0,+ border = mapY (lowerLength owidth) $ border self0,+ margin = mapY (lowerLength owidth) $ margin self0+ }+ self0 = self1 {+ size = (size self1) { block = Pixels $ flowNatHeight oheight self1 childs'}+ }+ self1 = self2 {+ size = (size self2) { inline = width' },+ B.max = (B.max self2) { inline = flowMaxWidth parent self2 },+ B.min = (B.min self2) { inline = flowMinWidth owidth self2 [] },+ padding = mapX (lowerLength owidth) $ padding self2,+ border = mapX (lowerLength owidth) $ border self2,+ margin = lowerMargin owidth (owidth - width') $ margin self2+ }+ width' = flowWidth parent self+ self2 = self {+ size = (size self) { inline = Pixels $ flowNatWidth owidth self childs },+ B.min = (B.min self) { inline = Pixels $ flowMinWidth owidth self childs }+ }+ owidth = inline $ size parent+ oheight = block $ size parent+ layoutZooko child = child {+ B.min = Size (inline $ B.min child) (flowMinHeight (block $ B.min self') child),+ size = Size (inline $ size child) (flowHeight self' child),+ B.max = Size (inline $ B.max child) (flowMaxHeight (block $ size self') child),+ padding = mapY (lowerLength owidth) $ padding child,+ border = mapY (lowerLength owidth) $ border child,+ margin = mapY (lowerLength owidth) $ margin child+ }++-- | Removes overlapping margins.+marginCollapse :: [PaddedBox Double n] -> [PaddedBox Double n]+marginCollapse (x'@PaddedBox {margin = xm@Border { bottom = x }}:+ y'@PaddedBox {margin = ym@Border { top = y}}:rest)+ | x > y = x':marginCollapse (y' {margin = ym { top = 0 }}:rest)+ | otherwise = x' { margin = xm { bottom = 0 }}:marginCollapse (y':rest)+marginCollapse rest = rest++-- | Resolves auto paddings or margins to fill given width.+lowerMargin :: Double -> Double -> Border m Length -> Border m Double+lowerMargin _ available (Border top' bottom' Auto Auto) =+ Border top' bottom' (available/2) (available/2)+lowerMargin outerwidth available (Border top' bottom' Auto right') =+ Border top' bottom' available $ lowerLength outerwidth right'+lowerMargin outerwidth available (Border top' bottom' left' Auto) =+ Border top' bottom' (lowerLength outerwidth left') available+lowerMargin outerwidth _ (Border top' bottom' left' right') =+ Border top' bottom' (lowerLength outerwidth left') (lowerLength outerwidth right')
+ Graphics/Layout/Grid.hs view
@@ -0,0 +1,202 @@+{-# LANGUAGE RecordWildCards, OverloadedStrings #-}+-- | Sizes grid cells & positions elements to them.+module Graphics.Layout.Grid(Grid(..), Track(..), GridItem(..), GridItem'(..), Alignment(..),+ buildTrack, buildGrid, setCellBox, enumerate, gridItemBox, cellSize,+ trackMin, trackNat, gridEstWidth, sizeTrackMins, sizeTrackNats, sizeTrackMaxs,+ trackPosition, gridPosition, trackLayout, gridLayout) where++import Data.Either (fromRight)+import Data.Text (Text)+import Data.List (intersperse)+import Graphics.Layout.Box as B++import Debug.Trace (trace)++-- | An element which positions it's children within a grid.+type Grid m n = Size (Track m) (Track n)+-- | The sizes to which children are alonged on a single axis.+data Track x = Track {+ -- | The desired size of each cell.+ -- If Left specifies ratio of excess space to use.+ cells :: [Either x Double],+ -- | The minimum amount of space each cell should take.+ trackMins :: [Double],+ -- | The ideal amount of space each cell should take.+ trackNats :: [Double],+ -- | How much space to add between cells.+ gap :: x+}+-- | Which cells a child should be aligned to.+type GridItem = Size GridItem' GridItem'+-- | How a grid child should be aligned per-axis.+data GridItem' = GridItem {+ -- | On which cell should this child start.+ cellStart :: Int,+ -- | Before which cell should this child end.+ cellEnd :: Int,+ -- | How to redistribute excess space.+ alignment :: Alignment,+ -- | The minimum amount of space to allocate to this child.+ minSize :: Double,+ -- | The maximum aount of space to allocate to this child.+ natSize :: Double+}+-- | How to redistribute excess space.+data Alignment = Start | Mid | End++-- | Constructs a track with default (to-be-computed) values & given cell sizes.+buildTrack :: CastDouble x => [Either x Double] -> Track x+buildTrack cells = Track cells [] [] $ fromDouble 0+-- | Constructs a grid with default (to-be-computed) values & given cell sizes.+buildGrid :: (CastDouble m, CastDouble n) =>+ [Either m Double] -> [Either n Double] -> Grid m n+buildGrid rows cols = Size (buildTrack cols) (buildTrack rows)++-- | Verify that the track is properly formed & can be validly processed.+verifyTrack :: Track x -> [GridItem'] -> Bool+verifyTrack track cells' = and [+ cellStart cell < length (cells track) && cellStart cell >= 0 &&+ cellEnd cell < length (cells track) && cellEnd cell > cellStart cell+ | cell <- cells']+-- | Verify that the grid is properly formed & can be validly processed.+verifyGrid :: Grid m n -> [GridItem] -> Bool+verifyGrid grid cells =+ verifyTrack (inline grid) (map inline cells) && verifyTrack (block grid) (map block cells)++-- | Compute the minimum size for the track given cell sizes.+-- Refers to computed min sizes if cached.+trackMin :: (n -> Double) -> Track n -> Double+trackMin cb self@Track { trackMins = [] } =+ sum $ intersperse (cb $ gap self) [cb x | Left x <- cells self]+trackMin cb self = sum $ intersperse (cb $ gap self) $ trackMins self+-- | Compute the natural size for the track given cell sizes.+-- Refers to compute natural sizes if cached.+trackNat :: (n -> Double) -> Track n -> Double+trackNat cb self@Track { trackNats = [] } =+ sum $ intersperse (cb $ gap self) [cb x | Left x <- cells self]+trackNat cb self = sum $ intersperse (cb $ gap self) $ trackNats self++-- | Selects all children entirely on the specified cell.+cellsForIndex :: [GridItem'] -> Int -> [GridItem']+cellsForIndex cells ix =+ [cell | cell <- cells, cellStart cell == ix, cellStart cell == pred (cellEnd cell)]+-- | Sets minimum & natural sizes from the given padded box.+setCellBox :: (CastDouble m, CastDouble n) => GridItem -> PaddedBox m n -> GridItem+setCellBox (Size x y) box = Size x {+ minSize = B.minWidth $ mapX' toDouble box,+ natSize = B.width $ mapX' toDouble box+ } y {+ minSize = B.minHeight $ mapY' toDouble box,+ natSize = B.height $ mapY' toDouble box+ }++-- | Estimate grid width to inform proper width calculation.+gridEstWidth :: Grid y Length -> [GridItem] -> Double+gridEstWidth (Size cols _) childs = trackNat toDouble cols {+ trackMins = sizeTrackMins 0 cols $ map inline childs,+ trackNats = sizeTrackNats 0 cols $ map inline childs+ }+-- | Calculate minimum sizes for all cells in the track.+-- Sized to fit given children.+sizeTrackMins :: Double -> Track Length -> [GridItem'] -> [Double]+sizeTrackMins parent track childs = map inner $ enumerate $ cells track+ where+ inner (_, Left (Pixels x)) = x+ inner (_, Left (Percent x)) = x * parent+ inner arg@(ix, Left Preferred) =+ maximum $ (0:) $ map natSize $ cellsForIndex childs ix+ inner (ix, _) =+ maximum $ (0:) $ map minSize $ cellsForIndex childs ix+-- | Compute natural sizes for all cells in the track.+-- Sized to fit given children.+sizeTrackNats :: Double -> Track Length -> [GridItem'] -> [Double]+sizeTrackNats parent track childs = map inner $ enumerate $ cells track+ where+ inner (_, Left (Pixels x)) = x+ inner (_, Left (Percent x)) = x * parent+ inner arg@(ix, Left Min) =+ maximum $ (0:) $ map minSize $ cellsForIndex childs ix+ inner (ix, _) =+ maximum $ (0:) $ map natSize $ cellsForIndex childs ix+-- | Compute maximum sizes for all cells in the track, sized to the parent element.+sizeTrackMaxs :: Double -> Track Length -> [Double]+sizeTrackMaxs parent track = map (inner fr) $ zip subsizes $ cells track+ where+ subsizes = zip (trackMins track) (trackNats track)+ fr = Prelude.max 0 fr'+ fr' = (parent - estimate)/(countFRs $ cells track)+ estimate = sum $ intersperse (lowerLength parent $ gap track) $+ map (inner 0) $ zip subsizes $ cells track+ inner _ (_, Left (Pixels x)) = x+ inner _ (_, Left (Percent x)) = x*parent+ inner _ ((_, nat), Left Preferred) = nat+ inner _ ((min, _), Left Min) = min+ inner fr ((_, nat), Left Auto) = Prelude.min nat fr+ inner fr (_, Right x) = x*fr++-- | Compute the position of all children within the grid.+trackPosition :: Track Double -> [GridItem'] -> [Double]+trackPosition self childs = map gridCellPosition childs+ where+ gridCellPosition child = track (cellStart child) + align whitespace (alignment child)+ where+ whitespace = track (cellEnd child) - track (cellStart child) - natSize child+ track = flip track' $ cells self+ track' ix (size:sizes) = fromRight 0 size + track' (pred ix) sizes+ track' 0 _ = 0+ track' ix [] = trace "WARNING! Malformed input table!" 0+ align _ Start = 0+ align excess Mid = excess/2+ align excess End = excess+-- Compute the maximum size along an axis of a child, for it to be sized to.+cellSize :: CastDouble x => Track x -> GridItem' -> Double+cellSize self child = track (cellEnd child) - track (cellStart child)+ where+ track = flip track' $ cells self+ track' ix (size:sizes) =+ (toDouble $ fromRight (fromDouble 0) size) + track' (pred ix) sizes+ track' 0 _ = 0+ track' ix [] = trace "WARNING! Malformed input table!" 0+-- | Compute the maximum size as a PaddedBox of a child, for it to be sized to.+gridItemBox :: (CastDouble x, CastDouble y) => Grid y x -> GridItem -> PaddedBox Double Double+gridItemBox (Size cols rows) cell =+ size2box (cellSize cols (inline cell) `Size` cellSize rows (block cell))+ where+ size2box size = zero { B.min = size, B.max = size, B.size = size }+-- | Compute the position of all children in a grid.+gridPosition :: Grid Double Double -> [GridItem] -> [(Double, Double)]+gridPosition (Size cols rows) childs =+ trackPosition rows (map inline childs) `zip` trackPosition cols (map block childs)+-- | Compute the track sizes & child positions along a single axis.+trackLayout :: Double -> Double -> Track Length -> [GridItem'] ->+ (Track Double, [(Double, GridItem')])+trackLayout parent width self childs = (self', zip positions childs)+ where+ positions = trackPosition self' childs+ self' = self {+ cells = map Left sizes,+ trackMins = mins, trackNats = nats,+ gap = lowerLength width $ gap self+ }+ sizes = sizeTrackMaxs parent self { trackMins = mins, trackNats = nats }+ mins = sizeTrackMins parent self childs+ nats = sizeTrackNats parent self childs+-- | Compute the track sizes & child positions along both axes.+gridLayout :: Size Double Double -> Grid Length Length -> [GridItem] ->+ (Grid Double Double, [((Double, Double), GridItem)])+gridLayout parent (Size cols rows) childs = (self', zip positions childs)+ where+ positions = gridPosition self' childs+ self' = Size cols' { gap = lowerLength width $ gap cols } rows'+ (rows', _) = trackLayout (block parent) width rows $ map block childs+ width = trackNat id cols'+ (cols', _) = trackLayout (inline parent) 0 cols $ map inline childs++-- | Utility for associate an index with each item in a list.+enumerate = zip [0..]++-- | Utility for summing the divisor used to compute the fr unit.+countFRs (Left Auto:rest) = succ $ countFRs rest+countFRs (Right x:rest) = x + countFRs rest+countFRs (_:rest) = countFRs rest+countFRs [] = 0
+ Graphics/Layout/Grid/CSS.hs view
@@ -0,0 +1,359 @@+{-# LANGUAGE OverloadedStrings #-}+-- | Infrastructure for parsing & desugaring grid-layout related CSS properties.+module Graphics.Layout.Grid.CSS(CSSGrid(..), Axis(..), CSSCell(..), Placement(..), finalizeGrid) where++import Stylist (PropertyParser(..))+import Data.CSS.Syntax.Tokens (Token(..), NumericValue(..))+import Data.Text (Text)+import qualified Data.Text as Txt+import Data.Char (isAlphaNum)+import Data.Maybe (fromMaybe)++import Graphics.Layout.CSS.Length+import Graphics.Layout.Box+import Graphics.Layout.Grid+import Graphics.Layout++-- | Parsed CSS Grid properties+data CSSGrid = CSSGrid {+ -- | Parsed CSS grid-auto-columns+ autoColumns :: Unitted,+ -- | Parsed grid-auto-flow+ autoFlow :: Axis,+ -- | Whether grid-auto-flow: dense was specified.+ autoFlowDense :: Bool,+ -- | Parsed CSS grid-auto-rows+ autoRows :: Unitted,+ -- | Parsed CSS grid-template-areas+ templateAreas :: [[Text]],+ -- | Parsed CSS grid-template-columns+ templateColumns :: [([Text], Unitted)],+ -- | Parsed CSS grid-template-rows+ templateRows :: [([Text], Unitted)],+ -- | Parsed CSS row-gap & column-gap+ cssGap :: Size Unitted Unitted,+ -- | Parsed CSS justify-items & align-items+ alignItems :: Size Alignment Alignment+}+-- | A grid axis.+data Axis = Row | Col deriving Eq+-- | Parsed CSS grid item properties.+data CSSCell = CSSCell {+ -- | Parsed CSS grid-column-start+ columnStart :: Placement,+ -- | Parsed CSS grid-column-end+ columnEnd :: Placement,+ -- | Parsed CSS grid-row-start+ rowStart :: Placement,+ -- | Parsed CSS grid-row-end+ rowEnd :: Placement,+ -- | Parsed CSS align-self & justify-self+ alignSelf :: Size (Maybe Alignment) (Maybe Alignment)+}+-- | Identifies a cell in the CSS grid.+data Placement = Autoplace | Named Text | Numbered Int (Maybe Text) |+ Span Int (Maybe Text)++instance PropertyParser CSSGrid where+ temp = CSSGrid {+ autoColumns = auto,+ autoFlow = Row,+ autoFlowDense = False,+ autoRows = auto,+ templateAreas = [],+ templateColumns = [],+ templateRows = [],+ cssGap = Size (0,"px") (0,"px"),+ alignItems = Size Start Start -- FIXME: Should be stretch, unsupported.+ }+ inherit _ = temp++ longhand _ s "grid-auto-columns" toks | Just x <- parseFR toks = Just s {autoColumns=x}+ longhand _ s "grid-auto-rows" toks | Just x <- parseFR toks = Just s { autoRows = x }++ longhand _ self "grid-auto-flow" [Ident "row"] = Just self {+ autoFlow = Row, autoFlowDense = False+ }+ longhand _ self "grid-auto-flow" [Ident "column"] = Just self {+ autoFlow = Col, autoFlowDense = False+ }+ longhand _ self "grid-auto-flow" [Ident "row", Ident "dense"] = Just self {+ autoFlow = Row, autoFlowDense = True+ }+ longhand _ self "grid-auto-flow" [Ident "column", Ident "dense"] = Just self {+ autoFlow = Col, autoFlowDense = True+ }++ longhand _ self "grid-template-areas" [Ident "none"] = Just self {templateAreas = []}+ longhand _ self "grid-template-areas" [Ident "initial"] = Just self {templateAreas=[]}+ longhand _ self "grid-template-areas" toks+ | all isString toks, validate [Txt.words x | String x <- toks] =+ Just self { templateAreas = [Txt.words x | String x <- toks] }+ where+ isString (String _) = True+ isString _ = False+ validate grid@(row:rows) =+ all isValidName (concat grid) && all (\x -> length row == length x) rows+ validate [] = False+ isValidName name = Txt.all (\c -> isAlphaNum c || c == '-') name++ longhand _ self "grid-template-columns" toks | Just x <- parseTemplate toks =+ Just self { templateColumns = x }+ longhand _ self "grid-template-rows" toks | Just x <- parseTemplate toks =+ Just self { templateRows = x}++ longhand _ self "row-gap" toks | Just x <- parseLength toks =+ Just self { cssGap = (cssGap self) { inline = x } }+ longhand _ self "column-gap" toks | Just x <- parseLength toks =+ Just self { cssGap = (cssGap self) { block = x } }++ longhand _ self "justify-items" [Ident "start"] =+ Just self { alignItems = (alignItems self) { inline = Start } }+ longhand _ self "justify-items" [Ident "flex-start"] =+ Just self { alignItems = (alignItems self) { inline = Start } }+ longhand _ self "justify-items" [Ident "self-start"] =+ Just self { alignItems = (alignItems self) { inline = Start } }+ longhand _ self "justify-items" [Ident "left"] =+ Just self { alignItems = (alignItems self) { inline = Start } }+ longhand _ self "justify-items" [Ident "center"] =+ Just self { alignItems = (alignItems self) { inline = Mid } }+ longhand _ self "justify-items" [Ident "end"] =+ Just self { alignItems = (alignItems self) { inline = End } }+ longhand _ self "justify-items" [Ident "flex-end"] =+ Just self { alignItems = (alignItems self) { inline = End } }+ longhand _ self "justify-items" [Ident "self-end"] =+ Just self { alignItems = (alignItems self) { inline = End } }+ longhand _ self "justify-items" [Ident "right"] =+ Just self { alignItems = (alignItems self) { inline = End } }+ longhand parent self "justify-items" (Ident "unsafe":toks) =+ longhand parent self "justify-items" toks+ longhand _ self "justify-items" [Ident "normal"] = -- FIXME Should be stretch, unsupported.+ Just self { alignItems = (alignItems self) { inline = Start } }+ longhand _ self "justify-items" [Ident "initial"] = -- FIXME Should be stretch, unsupported.+ Just self { alignItems = (alignItems self) { inline = Start } }++ longhand _ self "align-items" [Ident "start"] =+ Just self { alignItems = (alignItems self) { block = Start } }+ longhand _ self "align-items" [Ident "flex-start"] =+ Just self { alignItems = (alignItems self) { block = Start } }+ longhand _ self "align-items" [Ident "self-start"] =+ Just self { alignItems = (alignItems self) { block = Start } }+ longhand _ self "align-items" [Ident "center"] =+ Just self { alignItems = (alignItems self) { block = Mid } }+ longhand _ self "align-items" [Ident "end"] =+ Just self { alignItems = (alignItems self) { block = End } }+ longhand _ self "align-items" [Ident "flex-end"] =+ Just self { alignItems = (alignItems self) { block = End } }+ longhand _ self "align-items" [Ident "self-end"] =+ Just self { alignItems = (alignItems self) { block = End } }+ longhand parent self "align-items" (Ident "unsafe":toks) =+ longhand parent self "align-items" toks+ longhand _ self "align-items" [Ident "normal"] = -- FIXME Should be stretch, unsupported.+ Just self { alignItems = (alignItems self) { block = Start } }+ longhand _ self "align-items" [Ident "initial"] = -- FIXME Should be stretch, unsupported.+ Just self { alignItems = (alignItems self) { block = Start } }++ longhand _ _ _ _ = Nothing++instance PropertyParser CSSCell where+ temp = CSSCell {+ columnStart = Autoplace,+ columnEnd = Autoplace,+ rowStart = Autoplace,+ rowEnd = Autoplace,+ alignSelf = Size Nothing Nothing+ }+ inherit _ = temp++ longhand _ self "grid-column-start" toks | Just x <- placement toks =+ Just self { columnStart = x}+ longhand _ s "grid-column-end" toks | Just x <- placement toks = Just s {columnEnd=x}+ longhand _ s "grid-row-start" toks | Just x <- placement toks = Just s {rowStart = x}+ longhand _ s "grid-row-end" toks | Just x <- placement toks = Just s { rowEnd = x }++ longhand _ self "align-self" [Ident "start"] =+ Just self { alignSelf = (alignSelf self) { block = Just Start } }+ longhand _ self "align-self" [Ident "self-start"] =+ Just self { alignSelf = (alignSelf self) { block = Just Start } }+ longhand _ self "align-self" [Ident "flex-start"] =+ Just self { alignSelf = (alignSelf self) { block = Just Start } }+ longhand _ self "align-self" [Ident "center"] =+ Just self { alignSelf = (alignSelf self) { block = Just Mid } }+ longhand _ self "align-self" [Ident "end"] =+ Just self { alignSelf = (alignSelf self) { block = Just End } }+ longhand _ self "align-self" [Ident "self-end"] =+ Just self { alignSelf = (alignSelf self) { block = Just End } }+ longhand _ self "align-self" [Ident "flex-end"] =+ Just self { alignSelf = (alignSelf self) { block = Just End } }+ longhand _ self "align-self" [Ident "normal"] = -- FIXME should be stretch, unsupported+ Just self { alignSelf = (alignSelf self) { block = Just Start } }+ longhand parent self "align-self" (Ident "unsafe":toks) =+ longhand parent self "align-self" toks+ longhand _ self "align-self" [Ident "auto"] =+ Just self { alignSelf = (alignSelf self) { block = Nothing } }+ longhand _ self "align-self" [Ident "initial"] =+ Just self { alignSelf = (alignSelf self) { block = Nothing } }++ longhand _ self "justify-self" [Ident "start"] =+ Just self { alignSelf = (alignSelf self) { inline = Just Start } }+ longhand _ self "justify-self" [Ident "self-start"] =+ Just self { alignSelf = (alignSelf self) { inline = Just Start } }+ longhand _ self "justify-self" [Ident "flex-start"] =+ Just self { alignSelf = (alignSelf self) { inline = Just Start } }+ longhand _ self "justify-self" [Ident "left"] =+ Just self { alignSelf = (alignSelf self) { inline = Just Start } }+ longhand _ self "justify-self" [Ident "center"] =+ Just self { alignSelf = (alignSelf self) { inline = Just Mid } }+ longhand _ self "justify-self" [Ident "end"] =+ Just self { alignSelf = (alignSelf self) { inline = Just End } }+ longhand _ self "justify-self" [Ident "self-end"] =+ Just self { alignSelf = (alignSelf self) { inline = Just End } }+ longhand _ self "justify-self" [Ident "flex-end"] =+ Just self { alignSelf = (alignSelf self) { inline = Just End } }+ longhand _ self "justify-self" [Ident "right"] =+ Just self { alignSelf = (alignSelf self) { inline = Just End } }+ longhand _ self "justify-self" [Ident "normal"] = -- FIXME should be stretch, unsupported+ Just self { alignSelf = (alignSelf self) { inline = Just Start } }+ longhand parent self "justify-self" (Ident "unsafe":toks) =+ longhand parent self "justify-self" toks+ longhand _ self "justify-self" [Ident "auto"] =+ Just self { alignSelf = (alignSelf self) { inline = Nothing } }+ longhand _ self "justify-self" [Ident "initial"] =+ Just self { alignSelf = (alignSelf self) { inline = Nothing } }++ longhand _ _ _ _ = Nothing++-- | Parse a length or FR unit.+parseFR [Dimension _ x "fr"] = Just (n2f x,"fr")+parseFR toks = parseLength toks+-- | Parse a length or FR unit, including extended keywords.+parseFR' [Dimension _ x "fr"] = Just (n2f x,"fr")+parseFR' toks = parseLength' toks++-- | Parse an identifier for a grid cell.+placement [Ident "auto"] = Just $ Autoplace+placement [Ident x] = Just $ Named x+placement [Number _ (NVInteger x)] = Just $ Numbered (fromEnum x) Nothing+placement [Number _ (NVInteger x), Ident y] = Just $ Numbered (fromEnum x) (Just y)+placement [Ident "span", Number _ (NVInteger x)]+ | x > 0 = Just $ Span (fromEnum x) Nothing+placement [Ident "span", Ident x] = Just $ Span 1 $ Just x+placement [Ident "span", Number _ (NVInteger x), Ident y]+ | x > 0 = Just $ Span (fromEnum x) (Just y)+placement [Ident "span", Ident y, Number _ (NVInteger x)]+ | x > 0 = Just $ Span (fromEnum x) (Just y)+placement _ = Nothing++-- | Parse grid-template-*+parseTemplate [Ident "none"] = Just []+parseTemplate [Ident "initial"] = Just []+parseTemplate toks | (tracks@(_:_), []) <- parseTrack toks = Just tracks+parseTemplate _ = Nothing+-- | Parse an individual track specified by grid-template-*+parseTrack (LeftSquareBracket:toks)+ | Just (names', toks') <- parseNames toks,+ ((names,size):cells,toks) <- parseTrack toks' = ((names' ++ names,size):cells,toks)+ | Just (names', toks') <- parseNames toks = ([(names',(0,"end"))],toks')+parseTrack (tok:toks) | Just x <- parseFR' [tok] =+ (([], x):fst (parseTrack toks), snd $ parseTrack toks)+parseTrack (Function "repeat":Number _ (NVInteger x):Comma:toks)+ | x > 0, (tracks@(_:_), RightParen:toks') <- parseTrack toks =+ (concat $ replicate (fromEnum x) tracks, toks')+parseTrack toks = ([], toks)+-- | (UNUSED) Parse a subgrid specified by grid-template-*+parseSubgrid (LeftSquareBracket:toks)+ | Just (names', toks') <- parseNames toks, (names,toks'') <- parseSubgrid toks' =+ (names' : names, toks')+parseSubgrid (Function "repeat":Number _ (NVInteger x):Comma:toks)+ | x > 0, (names@(_:_), RightParen:toks') <- parseSubgrid toks =+ (concat $ replicate (fromEnum x) names, toks')+parseSubgrid toks = ([], toks)+-- | Parse a track's names.+parseNames (Ident x:toks)+ | Just (names,toks') <- parseNames toks = Just (x:names,toks')+parseNames (RightSquareBracket:toks) = Just ([], toks)+parseNames _ = Nothing++-- | Desugar grid properties to a grid layout.+finalizeGrid :: PropertyParser x => CSSGrid -> Font' ->+ [CSSCell] -> [LayoutItem Length Length x] -> LayoutItem Length Length x+finalizeGrid self@CSSGrid {+ templateColumns = cols', templateRows = rows'+ } font cells childs = LayoutGrid temp self' cells' childs+ where+ self' = Size Track {+ cells = map finalizeFR $ map snd rows0,+ trackMins = [], trackNats = [],+ gap = finalizeLength (inline $ cssGap self) font+ } Track {+ cells = map finalizeFR $ map snd cols0,+ trackMins = [], trackNats = [],+ gap = finalizeLength (block $ cssGap self) font+ }++ (cells', rows0, cols0) = finalizeCells cells rows' cols'+ finalizeCells :: [CSSCell] -> [([Text], Unitted)] -> [([Text], Unitted)] ->+ ([GridItem], [([Text], Unitted)], [([Text], Unitted)])+ finalizeCells (cell:cells) rows cols = (cell':cells', rows_, cols_)+ where+ (cell', rows0, cols0) = finalizeCell cell rows cols+ (cells', rows_, cols_) = finalizeCells cells rows0 cols0+ finalizeCells [] rows cols = ([], rows, cols)+ finalizeCell :: CSSCell -> [([Text], Unitted)] -> [([Text], Unitted)] ->+ (GridItem, [([Text], Unitted)], [([Text], Unitted)])+ finalizeCell cell@CSSCell {+ rowStart = Autoplace, columnStart = Autoplace+ } rows cols | autoFlow self == Row =+ finalizeCell cell { columnStart = Numbered 1 Nothing } rows cols+ | autoFlow self == Col =+ finalizeCell cell { rowStart = Numbered 1 Nothing } rows cols+ finalizeCell cell rows cols = (Size GridItem {+ cellStart = startCol', cellEnd = endCol',+ minSize = 0, natSize = 0,+ alignment = fromMaybe (inline $ alignItems self) (inline $ alignSelf cell)+ } GridItem {+ cellStart = startRow', cellEnd = endRow',+ minSize = 0, natSize = 0,+ alignment = fromMaybe (inline $ alignItems self) (inline $ alignSelf cell)+ }, rows', cols')+ where+ (startRow', endRow', rows') = lowerTrack2 rows ([], autoRows self)+ (rowStart cell) (rowEnd cell)+ (startCol', endCol', cols') = lowerTrack2 cols ([], autoColumns self) + (columnStart cell) (columnEnd cell)++ lowerTrack2 tracks auto start Autoplace = lowerTrack2 tracks auto start $ Span 1 Nothing+ lowerTrack2 tracks auto start@(Span _ _) end@(Span _ _) =+ lowerTrack2 tracks auto start $ Numbered (pred $ length tracks) Nothing+ lowerTrack2 tracks auto start@(Span _ _) end = (start', end', tracks')+ where+ (end', tracks0) = lowerTrack tracks auto 0 end -- Already checked for spans.+ (start', tracks') = lowerTrack tracks auto (negate end') start+ lowerTrack2 tracks auto start end = (start', end', tracks')+ where+ (start', tracks0) = lowerTrack tracks auto 0 start -- already checked for spans.+ (end', tracks') = lowerTrack tracks auto start' end+ lowerTrack tracks auto _ (Named name)+ | ix:_ <- [ix | (ix, (names, _)) <- enumerate tracks, name `elem` names] = (ix, tracks)+ | otherwise = (length tracks, tracks ++ [auto])++ -- TODO Take into account placement strategy.+ lowerTrack tracks auto _ Autoplace = (length tracks, tracks ++ [auto])+ lowerTrack tracks _ _ (Numbered ix Nothing) = (ix, tracks)+ lowerTrack tracks auto _ (Numbered ix (Just name))+ | ix < length tracks' = (tracks' !! ix, tracks)+ | otherwise = (length tracks, tracks ++ [auto])+ where tracks' = [ix | (ix, (names, _)) <- enumerate tracks, name `elem` names]+ lowerTrack tracks _ start (Span x Nothing)+ | start > 0 = (start + x,tracks)+ | otherwise = (-start - x,tracks)+ lowerTrack tracks (_, auto) start (Span x (Just name)) = (tracks' !! x,tracks)+ where+ tracks0 | start < 0 = reverse tracks+ | otherwise = tracks+ tracks' = [ix | (ix, (names, _)) <-+ drop (abs start) $ enumerate (tracks0 ++ repeat ([name],auto)),+ name `elem` names]++ finalizeFR (x,"fr") = Right x+ finalizeFR x = Left $ finalizeLength x font
+ Graphics/Layout/Inline.hs view
@@ -0,0 +1,74 @@+{-# LANGUAGE TupleSections #-}+-- | Sizes inline text & extracts positioned children,+-- wraps Balkón for the actual logic.+module Graphics.Layout.Inline(inlineMinWidth, inlineMin, inlineNatWidth, inlineHeight,+ inlineSize, inlineChildren, layoutSize, layoutChildren,+ fragmentSize, fragmentSize', fragmentPos) where++import Data.Text.ParagraphLayout (Paragraph(..), ParagraphOptions(..),+ SpanLayout(..), Fragment(..),+ ParagraphLayout(..), layoutPlain, Span(..))+import Data.Text.ParagraphLayout.Rect (Rect(..), width, height, x_min, y_min)+import Data.Text.Internal (Text(..))+import qualified Data.Text as Txt+import Data.Char (isSpace)+import Data.Int (Int32)++import Graphics.Layout.Box (Size(..), CastDouble(..), fromDouble)+import Graphics.Layout.CSS.Font (Font', hbScale)++-- | Convert from Harfbuzz units to device pixels as a Double+hbScale' font = (/hbScale font) . fromIntegral+-- | Convert from Harfbuzz units to device pixels as a Double or Length.+c font = fromDouble . hbScale' font++-- | Compute minimum width for some richtext.+inlineMinWidth :: Font' -> Paragraph -> Double+inlineMinWidth font self = hbScale' font $ width $ layoutPlain' self 0+-- | Compute minimum width & height for some richtext.+inlineMin :: (CastDouble x, CastDouble y) => Font' -> Paragraph -> Size x y+inlineMin font self = Size (c font $ width rect) (c font $ height rect)+ where rect = layoutPlain' self 0+-- | Compute natural (single-line) width for some richtext.+inlineNatWidth :: Font' -> Paragraph -> Double+inlineNatWidth font self = hbScale' font $ width $ layoutPlain' self maxBound+-- | Compute height for rich text at given width.+inlineHeight :: Font' -> Double -> Paragraph -> Double+inlineHeight font width self =+ hbScale' font $ height $ layoutPlain' self $ round (hbScale font * width)++-- | Compute width & height of some richtext at configured width.+inlineSize :: (CastDouble x, CastDouble y) => Font' -> Paragraph -> Size x y+inlineSize font self = layoutSize font $ layoutPlain self+-- | Retrieve children out of some richtext,+-- associating given userdata with them.+inlineChildren :: [x] -> Paragraph -> [(x, Fragment)]+inlineChildren vals self = layoutChildren vals $ layoutPlain self++-- | Retrieve a laid-out paragraph's rect & convert to CatTrap types.+layoutSize :: (CastDouble x, CastDouble y) => Font' -> ParagraphLayout -> Size x y+layoutSize font self = Size (c font $ width r) (c font $ height r)+ where r = paragraphRect self+-- | Retrieve a laid-out paragraph's children & associate with given userdata.+layoutChildren :: [x] -> ParagraphLayout -> [(x, Fragment)]+layoutChildren vals self = zip vals $ concat $ map inner $ spanLayouts self+ where inner (SpanLayout y) = y++-- | Layout a paragraph at given width & retrieve resulting rect.+layoutPlain' :: Paragraph -> Int32 -> Rect Int32+layoutPlain' (Paragraph a b c d) width =+ paragraphRect $ layoutPlain $ Paragraph a b c d { paragraphMaxWidth = width }++-- | Retrieve the rect for a fragment & convert to CatTrap types.+fragmentSize :: (CastDouble x, CastDouble y) => Font' -> Fragment -> Size x y+fragmentSize font self = Size (c font $ width r) (c font $ height r)+ where r = fragmentRect self+-- | Variant of `fragmentSize` asserting to the typesystem that both fields+-- of the resulting `Size` are of the same type.+fragmentSize' :: CastDouble x => Font' -> Fragment -> Size x x+fragmentSize' = fragmentSize -- Work around for typesystem.+-- | Retrieve the position of a fragment.+fragmentPos :: Font' -> (Double, Double) -> Fragment -> (Double, Double)+fragmentPos font (x, y) self =+ (x + hbScale' font (x_min r), y + hbScale' font (y_min r))+ where r = fragmentRect self
+ Graphics/Layout/Inline/CSS.hs view
@@ -0,0 +1,60 @@+{-# LANGUAGE OverloadedStrings #-}+-- | Infrastructure for parsing & desugaring text related CSS properties.+module Graphics.Layout.Inline.CSS(CSSInline(..), ParagraphBuilder(..),+ buildParagraph, concatParagraph, finalizeParagraph) where++import Data.CSS.Syntax.Tokens (Token(..))+import Stylist (PropertyParser(..))+import qualified Data.Text.Lazy as Lz+import qualified Data.Text as Txt+import Data.Text.Internal (Text(..))+import Data.Text.ParagraphLayout (Span(..), SpanOptions(..), LineHeight(..),+ Paragraph(..), ParagraphOptions(..))++import Graphics.Layout.CSS.Font (Font'(..), hbScale)+import Data.Char (isSpace)++-- | Document text with Balkón styling options, CSS stylable.+data CSSInline = CSSInline Lz.Text SpanOptions++instance PropertyParser CSSInline where+ temp = CSSInline "" SpanOptions {+ spanLanguage = "Zxx"+ }+ inherit (CSSInline _ opts) = CSSInline "" opts++ longhand _ (CSSInline _ opts) "content" toks+ | all isString toks =+ Just $ CSSInline (Lz.concat [Lz.fromStrict x | String x <- toks]) opts+ where+ isString (String _) = True+ isString _ = False+ longhand _ (CSSInline txt opts) "-argo-lang" [String x] =+ Just $ CSSInline txt opts { spanLanguage = Txt.unpack x }+ longhand _ _ _ _ = Nothing++-- | Helper datastructure for concatenating CSSInlines.+data ParagraphBuilder = ParagraphBuilder Lz.Text [Span]++-- | Convert a CSSInline to a paragraph builder, with a span covering the entire text.+buildParagraph :: CSSInline -> ParagraphBuilder+buildParagraph (CSSInline txt opts) =+ ParagraphBuilder txt [flip Span opts $ fromEnum $ Lz.length txt]+-- | Concatenate two `ParagraphBuilder`s, adjusting the spans appropriately.+concatParagraph :: ParagraphBuilder -> ParagraphBuilder -> ParagraphBuilder+concatParagraph (ParagraphBuilder aTxt aOpts) (ParagraphBuilder bTxt bOps) =+ ParagraphBuilder (aTxt `Lz.append` bTxt)+ (aOpts ++ [Span (toEnum (fromEnum $ Lz.length aTxt) + off) opts+ | Span off opts <- bOps])+-- | Convert a builder + font to a Balkón paragraph.+finalizeParagraph :: ParagraphBuilder -> Font' -> Maybe Paragraph+finalizeParagraph (ParagraphBuilder txt _) _ | Lz.all isSpace txt || Lz.null txt = Nothing+finalizeParagraph (ParagraphBuilder txt ops) font' = Just $ Paragraph txt' 0 ops pOps+ where+ Text txt' _ _ = Lz.toStrict txt+ pOps = ParagraphOptions {+ paragraphFont = hbFont font',+ paragraphLineHeight = Absolute $ round (lineheight font' * hbScale font'),+ -- This is what we're computing! Configure to give natural width.+ paragraphMaxWidth = maxBound -- i.e. has all the space it needs...+ }
+ LICENSE view
@@ -0,0 +1,674 @@+ GNU GENERAL PUBLIC LICENSE+ Version 3, 29 June 2007++ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>+ Everyone is permitted to copy and distribute verbatim copies+ of this license document, but changing it is not allowed.++ Preamble++ The GNU General Public License is a free, copyleft license for+software and other kinds of works.++ The licenses for most software and other practical works are designed+to take away your freedom to share and change the works. By contrast,+the GNU General Public License is intended to guarantee your freedom to+share and change all versions of a program--to make sure it remains free+software for all its users. We, the Free Software Foundation, use the+GNU General Public License for most of our software; it applies also to+any other work released this way by its authors. You can apply it to+your programs, too.++ When we speak of free software, we are referring to freedom, not+price. Our General Public Licenses are designed to make sure that you+have the freedom to distribute copies of free software (and charge for+them if you wish), that you receive source code or can get it if you+want it, that you can change the software or use pieces of it in new+free programs, and that you know you can do these things.++ To protect your rights, we need to prevent others from denying you+these rights or asking you to surrender the rights. Therefore, you have+certain responsibilities if you distribute copies of the software, or if+you modify it: responsibilities to respect the freedom of others.++ For example, if you distribute copies of such a program, whether+gratis or for a fee, you must pass on to the recipients the same+freedoms that you received. You must make sure that they, too, receive+or can get the source code. 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+ Setup.hs view
@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain
+ app/Main.hs view
@@ -0,0 +1,214 @@+module Main where++import Text.XML.Light.Input (parseXMLDoc)+import qualified Text.XML.Light.Types as X+import Data.Maybe (fromJust, fromMaybe)+import qualified Data.Text as Txt+import Control.Monad (forM_, mapM)++import Graphics.Layout.CSS (CSSBox(..), finalizeCSS')+import Graphics.Layout.CSS.Font (placeholderFont)+import Graphics.Layout (LayoutItem, boxLayout,+ layoutGetBox, layoutGetChilds, layoutGetInner)+import Graphics.Layout.Box (zeroBox)+import qualified Graphics.Layout.Box as B++import Stylist.Tree (StyleTree(..))+import Stylist (PropertyParser(..))+import Data.CSS.Syntax.Tokens (Token(..), tokenize)++import Graphics.UI.GLUT+import Graphics.GL.Core32++import Foreign.Ptr (castPtr, nullPtr)+import Foreign.Storable (Storable(..))+import Foreign.Marshal.Array (withArrayLen, allocaArray, peekArray)+import Foreign.Marshal.Alloc (alloca)+import Foreign.Marshal.Utils (with)+import Foreign.C.String (withCString)++main :: IO ()+main = do+ (progname, args) <- getArgsAndInitialize+ source <- readFile $ case args of+ (filename:_) -> filename+ [] -> "styletree.xml"+ let xml = fromJust $ parseXMLDoc source+ let styles = xml2styles temp xml+ let layout = finalizeCSS' placeholderFont styles++ w <- createWindow progname++ vertexShader <- compileOGLShader vertexSource GL_VERTEX_SHADER+ fragmentShader <- compileOGLShader fragmentSource GL_FRAGMENT_SHADER+ shader <- compileOGLProgram [] [vertexShader, fragmentShader]+ glDetachShader shader vertexShader+ glDetachShader shader fragmentShader+ glDeleteShader vertexShader+ glDeleteShader fragmentShader++ displayCallback $= do+ clear [ ColorBuffer ]+ Size x y <- get windowSize+ let (display:_) = boxLayout zeroBox {+ B.size = B.Size (fromIntegral x) (fromIntegral y)+ } layout False++ glUseProgram shader+ attribScale <- withCString "windowsize" $ glGetUniformLocation shader+ glUniform3f attribScale (realToFrac x) (realToFrac y) 1++ renderDisplay shader display+ flush+ mainLoop++xml2styles :: CSSBox Nil -> X.Element -> StyleTree (CSSBox Nil)+xml2styles parent el = StyleTree {+ style = self',+ children = [xml2styles self' child | X.Elem child <- X.elContent el]+ } where self' = foldl (applyStyle parent) temp $ X.elAttribs el++applyStyle parent style (X.Attr (X.QName name _ _) val) =+ fromMaybe style $ longhand parent style (Txt.pack name) $+ filter (/= Whitespace) $ tokenize $ Txt.pack val++data Nil = Nil+instance PropertyParser Nil where+ temp = Nil+ inherit _ = Nil+ longhand _ _ _ _ = Nothing++renderDisplay :: GLuint -> LayoutItem Double Double ((Double, Double), a) -> IO ()+renderDisplay shader display = do+ let ((x, y), _) = layoutGetInner display+ let box = layoutGetBox display+ attribColour <- withCString "fill" $ glGetUniformLocation shader++ glUniform3f attribColour 1 0 0+ drawBox x y (B.width box) (B.height box)+ glUniform3f attribColour 0 1 0+ drawBox (x + B.left (B.margin box)) (y + B.top (B.margin box))+ (B.width box - B.left (B.margin box) - B.right (B.margin box))+ (B.height box - B.top (B.margin box) - B.bottom (B.margin box))+ glUniform3f attribColour 0 0 1+ drawBox (x + B.left (B.margin box) + B.left (B.border box))+ (y + B.top (B.margin box) + B.top (B.border box))+ (B.inline (B.size box) + B.left (B.padding box) + B.right (B.padding box))+ (B.block (B.size box) + B.top (B.padding box) + B.bottom (B.padding box))+ glUniform3f attribColour 1 1 0+ drawBox (x + B.left (B.margin box) + B.left (B.border box) + B.left (B.padding box))+ (y + B.top (B.margin box) + B.top (B.border box) + B.top (B.padding box))+ (B.inline $ B.size box) (B.block $ B.size box)++ mapM (renderDisplay shader) $ layoutGetChilds display+ return ()++drawBox x y width height = do+ buf <- withPointer $ glGenBuffers 1+ glBindBuffer GL_ARRAY_BUFFER buf+ glBufferData' GL_ARRAY_BUFFER [+ x, y, 0,+ x + width, y, 0,+ x, y + height, 0,++ x + width, y, 0,+ x + width, y + height, 0,+ x, y + height, 0+ ] GL_STATIC_DRAW++ glEnableVertexAttribArray 0+ glBindBuffer GL_ARRAY_BUFFER buf+ glVertexAttribPointer 0 3 GL_FLOAT GL_FALSE 0 nullPtr++ glDrawArrays GL_TRIANGLES 0 6+ glDisableVertexAttribArray 0++withPointer cb = alloca $ \ret' -> do+ cb ret'+ peek ret'++glBufferData' _ [] _ = return ()+glBufferData' target dat usage =+ withArrayLen (map realToFrac dat :: [Float]) $ \len dat' -> do+ glBufferData target (toEnum $ len*sizeOf (head dat)) (castPtr dat') usage++compileOGLShader :: String -> GLenum -> IO GLuint+compileOGLShader src shType = do+ shader <- glCreateShader shType+ if shader == 0+ then error "Could not create shader"+ else do+ success <-do+ withCString (src) $ \ptr ->+ with ptr $ \ptrptr -> glShaderSource shader 1 ptrptr nullPtr++ glCompileShader shader+ with (0 :: GLint) $ \ptr -> do+ glGetShaderiv shader GL_COMPILE_STATUS ptr+ peek ptr++ if success == GL_FALSE+ then do+ err <- do+ infoLog <- with (0 :: GLint) $ \ptr -> do+ glGetShaderiv shader GL_INFO_LOG_LENGTH ptr+ logsize <- peek ptr+ allocaArray (fromIntegral logsize) $ \logptr -> do+ glGetShaderInfoLog shader logsize nullPtr logptr+ peekArray (fromIntegral logsize) logptr++ return $ unlines [ "Could not compile shader:"+ , src+ , map (toEnum . fromEnum) infoLog+ ]+ error err+ else return shader++compileOGLProgram :: [(String, Integer)] -> [GLuint] -> IO GLuint+compileOGLProgram attribs shaders = do+ (program, success) <- do+ program <- glCreateProgram+ forM_ shaders (glAttachShader program)+ forM_ attribs+ $ \(name, loc) ->+ withCString name+ $ glBindAttribLocation program+ $ fromIntegral loc+ glLinkProgram program++ success <- with (0 :: GLint) $ \ptr -> do+ glGetProgramiv program GL_LINK_STATUS ptr+ peek ptr+ return (program, success)++ if success == GL_FALSE+ then with (0 :: GLint) $ \ptr -> do+ glGetProgramiv program GL_INFO_LOG_LENGTH ptr+ logsize <- peek ptr+ infoLog <- allocaArray (fromIntegral logsize) $ \logptr -> do+ glGetProgramInfoLog program logsize nullPtr logptr+ peekArray (fromIntegral logsize) logptr+ error $ unlines+ [ "Could not link program"+ , map (toEnum . fromEnum) infoLog+ ]+ else do+ forM_ shaders glDeleteShader+ return program++vertexSource = unlines [+ "#version 330 core",+ "layout(location = 0) in vec3 vertexPositionModelSpace;",+ "uniform vec3 windowsize;",+ "void main() {",+ "gl_Position.xyz = vertexPositionModelSpace/windowsize - 1;",+ "gl_Position.y = -gl_Position.y;",+ "gl_Position.w = 1.0;",+ "}"+ ]+fragmentSource = unlines [+ "#version 330 core",+ "uniform vec3 fill;",+ "out vec3 colour;",+ "void main() { colour = fill; }"+ ]
+ cattrap.cabal view
@@ -0,0 +1,56 @@+-- Initial cattrap.cabal generated by cabal init. For further+-- documentation, see http://haskell.org/cabal/users-guide/++name: cattrap+version: 0.1.0.0+synopsis: Lays out boxes according to the CSS Box Model.+description: Computes where to place e.g. images, paragraphs, containers, tables, etc onscreen given desired amounts of whitespace.+homepage: https://argonaut-constellation.org/+license: GPL-3+license-file: LICENSE+author: Adrian Cochrane+maintainer: ~alcinnz/cattrap@todo.argonaut-constellation.org+bug-reports: https://todo.argonaut-constellation.org/~alcinnz/cattrap+copyright: Adrian Cochrane 2023+category: Graphics+build-type: Simple+extra-source-files: CHANGELOG.md+cabal-version: >=1.10++source-repository head+ type: git+ location: https://git.argonaut-constellation.org/~alcinnz/cattrap++library+ exposed-modules: Graphics.Layout, Graphics.Layout.CSS, Graphics.Layout.Flow,+ Graphics.Layout.Grid, Graphics.Layout.Grid.CSS,+ Graphics.Layout.Box, Graphics.Layout.Arithmetic,+ Graphics.Layout.CSS.Length, Graphics.Layout.CSS.Font,+ Graphics.Layout.Inline, Graphics.Layout.Inline.CSS+ -- other-modules:+ -- other-extensions:+ build-depends: base >=4.12 && <4.16, containers,+ css-syntax, scientific, text,+ stylist-traits >= 0.1.1.0 && < 1,+ fontconfig-pure >= 0.2 && < 0.3,+ harfbuzz-pure >= 1.0.3.2 && < 1.1, bytestring,+ balkon >= 0.2.1 && < 1+ -- hs-source-dirs:+ default-language: Haskell2010+ ghc-options: -Wincomplete-patterns++executable cattrap+ main-is: Main.hs+ -- other-modules:+ -- other-extensions:+ build-depends: base >=4.12 && <4.16, cattrap, xml, text, css-syntax, stylist-traits, GLUT, gl+ hs-source-dirs: app+ default-language: Haskell2010++test-suite test-cattrap+ hs-source-dirs: test+ default-language: Haskell2010+ type: exitcode-stdio-1.0+ main-is: Test.hs+ build-depends: base, cattrap, hspec >= 2 && < 3, QuickCheck >= 2 && < 3,+ css-syntax, stylist-traits
+ test/Test.hs view
@@ -0,0 +1,293 @@+{-# LANGUAGE OverloadedStrings #-}+module Main where++import Test.Hspec++import Graphics.Layout.Arithmetic+import Data.CSS.Syntax.Tokens (tokenize, Token(..))+import Stylist (PropertyParser(..))++import Graphics.Layout.Box as B+import Graphics.Layout.Grid+import Graphics.Layout.Flow+import Graphics.Layout++main :: IO ()+main = hspec spec++spec :: Spec+spec = do+ describe "canary" $ do+ it "test framework works" $ do+ True `shouldBe` True+ describe "calc()" $ do+ it "Can perform basic arithmatic" $ do+ runMath "42" `shouldBe` 42+ runMath "6 * 9" `shouldBe` 54+ runMath "6 * 9 - 42" `shouldBe` 12+ runMath "6 * (9 - 42)" `shouldBe` -198+ runMath "6 * calc(9 - 42)" `shouldBe` -198+ runMath "6 * abs(9 - 42)" `shouldBe` 198+ describe "Flow sizing" $ do+ -- Based on http://hixie.ch/tests/adhoc/css/box/block/+ it "Can overflow parent" $ do+ width (fst $ layoutFlow zeroBox {+ size = Size 3 1+ } lengthBox {+ border = Border (Pixels 0) (Pixels 0) (Pixels 2) (Pixels 2)+ } []) `shouldBe` 4+ width (fst $ layoutFlow zeroBox {+ size = Size 3 1+ } lengthBox {+ padding = Border (Pixels 0) (Pixels 0) (Pixels 2) (Pixels 2)+ } []) `shouldBe` 4+ width (fst $ layoutFlow zeroBox {+ size = Size 3 1+ } lengthBox {+ margin = Border (Pixels 0) (Pixels 0) (Pixels 2) (Pixels 2)+ } []) `shouldBe` 4+ it "Fits to parent" $ do+ width (fst $ layoutFlow zeroBox {+ size = Size 5 1+ } lengthBox {+ border = Border (Pixels 0) (Pixels 0) (Pixels 2) (Pixels 2),+ size = Size Auto $ Pixels 1+ } []) `shouldBe` 5+ width (fst $ layoutFlow zeroBox {+ size = Size 5 1+ } lengthBox {+ padding = Border (Pixels 0) (Pixels 0) (Pixels 2) (Pixels 2),+ size = Size Auto $ Pixels 1+ } []) `shouldBe` 5+ width (fst $ layoutFlow zeroBox {+ size = Size 5 1+ } lengthBox {+ margin = Border (Pixels 0) (Pixels 0) (Pixels 2) (Pixels 2),+ size = Size Auto $ Pixels 1+ } []) `shouldBe` 5+ it "Fits children" $ do+ let child = mapX' (lowerLength 100) $ lengthBox {+ size = Size (Pixels 10) (Pixels 10)+ }+ height (fst $ layoutFlow zeroBox {+ size = Size 100 100+ } lengthBox [child, child]) `shouldBe` 20+ it "Collapses margins" $ do+ let a :: PaddedBox Length Double+ a = PaddedBox {+ B.min = Size 0 Auto,+ size = Size 0 Auto,+ B.nat = Size 0 0,+ B.max = Size 0 Auto,+ padding = Border (Pixels 0) (Pixels 0) 0 0,+ border = Border (Pixels 0) (Pixels 0) 0 0,+ margin = Border (Pixels 5) (Pixels 10) 0 0+ }+ b :: PaddedBox Length Double+ b = PaddedBox {+ B.min = Size 0 Auto,+ size = Size 0 Auto,+ B.nat = Size 0 0,+ B.max = Size 0 Auto,+ padding = Border (Pixels 0) (Pixels 0) 0 0,+ border = Border (Pixels 0) (Pixels 0) 0 0,+ margin = Border (Pixels 10) (Pixels 5) 0 0+ }+ height (fst $ layoutFlow zeroBox {+ size = Size 100 100+ } lengthBox [a, a]) `shouldBe` 25+ height (fst $ layoutFlow zeroBox {+ size = Size 100 100+ } lengthBox [b, b]) `shouldBe` 25+ height (fst $ layoutFlow zeroBox {+ size = Size 100 100+ } lengthBox [a, b]) `shouldBe` 20+ height (fst $ layoutFlow zeroBox {+ size = Size 100 100+ } lengthBox [b, a]) `shouldBe` 25+ {-describe "Grid" $ do+ it "computes single-columns widths/heights" $ do+ let (pxGrid, pxCells) = gridLayout zeroBox {+ size = Size 100 100+ } (buildGrid [Left $ Pixels 10] [Left $ Pixels 10])+ [GridItem 0 1 0 1 (Size Start Start) zeroBox] True+ containerSize pxGrid `shouldBe` Size 10 10+ fst (head pxCells) `shouldBe` Size 0 0+ let (pcGrid, pcCells) = gridLayout zeroBox {+ size = Size 100 100+ } (buildGrid [Left $ Percent 0.5] [Left $ Percent 0.5])+ [GridItem 0 1 0 1 (Size Start Start) zeroBox] True+ containerSize pcGrid `shouldBe` Size 50 50+ fst (head pcCells) `shouldBe` Size 0 0+ let (autoGrid, autoCells) = gridLayout zeroBox {+ size = Size 100 100+ } (buildGrid [Left Auto] [Left Auto])+ [GridItem 0 1 0 1 (Size Start Start) zeroBox {+ B.min = Size 10 10,+ size = Size 20 20+ }] True+ containerSize autoGrid `shouldBe` Size 20 20+ fst (head autoCells) `shouldBe` Size 0 0+ let (prefGrid, prefCells) = gridLayout zeroBox {+ size = Size 100 100+ } (buildGrid [Left Preferred] [Left Preferred])+ [GridItem 0 1 0 1 (Size Start Start) zeroBox {+ B.min = Size 10 10,+ size = Size 15 15+ }] True+ containerSize prefGrid `shouldBe` Size 15 15+ fst (head prefCells) `shouldBe` Size 0 0+ let (minGrid, minCells) = gridLayout zeroBox {+ size = Size 100 100+ } (buildGrid [Left Min] [Left Min])+ [GridItem 0 1 0 1 (Size Start Start) zeroBox {+ B.min = Size 10 10,+ size = Size 15 15+ }] True+ containerSize minGrid `shouldBe` Size 10 10+ fst (head minCells) `shouldBe` Size 0 0-}+ describe "Abstract layout" $ do+ it "Can overflow parent" $ do+ width (layoutGetBox $ head $ boxLayout zeroBox {+ size = Size 3 1+ } (LayoutFlow () lengthBox {+ border = Border (Pixels 0) (Pixels 0) (Pixels 2) (Pixels 2)+ } []) False) `shouldBe` 4+ height (layoutGetBox $ head $ boxLayout zeroBox {+ size = Size 3 1+ } (LayoutFlow () lengthBox {+ border = Border (Pixels 2) (Pixels 2) (Pixels 2) (Pixels 2)+ } []) False) `shouldBe` 4+ width (layoutGetBox $ head $ boxLayout zeroBox {+ size = Size 3 1+ } (LayoutFlow () lengthBox {+ padding = Border (Pixels 0) (Pixels 0) (Pixels 2) (Pixels 2)+ } []) False) `shouldBe` 4+ height (layoutGetBox $ head $ boxLayout zeroBox {+ size = Size 3 1+ } (LayoutFlow () lengthBox {+ padding = Border (Pixels 2) (Pixels 2) (Pixels 2) (Pixels 2)+ } []) False) `shouldBe` 4+ width (layoutGetBox $ head $ boxLayout zeroBox {+ size = Size 3 1+ } (LayoutFlow () lengthBox {+ margin = Border (Pixels 0) (Pixels 0) (Pixels 2) (Pixels 2)+ } []) False) `shouldBe` 4+ height (layoutGetBox $ head $ boxLayout zeroBox {+ size = Size 3 1+ } (LayoutFlow () lengthBox {+ margin = Border (Pixels 2) (Pixels 2) (Pixels 2) (Pixels 2)+ } []) False) `shouldBe` 4+ it "Fits to parent" $ do+ width (layoutGetBox $ head $ boxLayout zeroBox {+ size = Size 5 1+ } (LayoutFlow () lengthBox {+ border = Border (Pixels 0) (Pixels 0) (Pixels 2) (Pixels 2),+ size = Size Auto $ Pixels 1+ } []) False) `shouldBe` 5+ width (layoutGetBox $ head $ boxLayout zeroBox {+ size = Size 5 1+ } (LayoutFlow () lengthBox {+ padding = Border (Pixels 0) (Pixels 0) (Pixels 2) (Pixels 2),+ size = Size Auto $ Pixels 1+ } []) False) `shouldBe` 5+ width (layoutGetBox $ head $ boxLayout zeroBox {+ size = Size 5 1+ } (LayoutFlow () lengthBox {+ margin = Border (Pixels 0) (Pixels 0) (Pixels 2) (Pixels 2),+ size = Size Auto $ Pixels 1+ } []) False) `shouldBe` 5+ it "Fits children" $ do+ let child = LayoutFlow () lengthBox {+ size = Size (Pixels 10) (Pixels 10),+ B.max = Size (Pixels 10) (Pixels 10)+ } []+ height (layoutGetBox $ head $ boxLayout zeroBox {+ size = Size 100 100+ } child False) `shouldBe` 10+ height (layoutGetBox $ head $ boxLayout zeroBox {+ size = Size 100 100+ } (LayoutFlow () lengthBox [child, child]) False) `shouldBe` 20+ it "Collapses margins" $ do+ let a :: LayoutItem Length Length ()+ a = LayoutFlow () PaddedBox {+ B.min = Size Auto Auto,+ size = Size Auto Auto,+ B.nat = Size 0 0,+ B.max = Size Auto Auto,+ padding = Border (Pixels 0) (Pixels 0) (Pixels 0) (Pixels 0),+ border = Border (Pixels 0) (Pixels 0) (Pixels 0) (Pixels 0),+ margin = Border (Pixels 5) (Pixels 10) (Pixels 0) (Pixels 0)+ } []+ b :: LayoutItem Length Length ()+ b = LayoutFlow () PaddedBox {+ B.min = Size Auto Auto,+ size = Size Auto Auto,+ B.nat = Size 0 0,+ B.max = Size Auto Auto,+ padding = Border (Pixels 0) (Pixels 0) (Pixels 0) (Pixels 0),+ border = Border (Pixels 0) (Pixels 0) (Pixels 0) (Pixels 0),+ margin = Border (Pixels 10) (Pixels 5) (Pixels 0) (Pixels 0)+ } []+ height (layoutGetBox $ head $ boxLayout zeroBox {+ size = Size 100 100+ } (LayoutFlow () lengthBox [a, a]) False) `shouldBe` 25+ height (layoutGetBox $ head $ boxLayout zeroBox {+ size = Size 100 100+ } (LayoutFlow () lengthBox [b, b]) False) `shouldBe` 25+ height (layoutGetBox $ head $ boxLayout zeroBox {+ size = Size 100 100+ } (LayoutFlow () lengthBox [a, b]) False) `shouldBe` 20+ height (layoutGetBox $ head $ boxLayout zeroBox {+ size = Size 100 100+ } (LayoutFlow () lengthBox [b, a]) False) `shouldBe` 25++ {-it "computes single-columns widths/heights" $ do+ let zeroCell = LayoutFlow () lengthBox []+ let nonzeroCell = LayoutFlow () lengthBox {+ B.min = Size (Pixels 10) (Pixels 10),+ size = Size (Pixels 20) (Pixels 20)+ } []++ let LayoutGrid (_, _) pxGrid pxCells = boxLayout zeroBox {+ size = Size 100 100+ } (LayoutGrid () (buildGrid [Left $ Pixels 10] [Left $ Pixels 10])+ [(GridItem 0 1 0 1 (Size Start Start) lengthBox, zeroCell)]) True+ let LayoutFlow (pos, _) _ _ = snd $ head pxCells+ containerSize pxGrid `shouldBe` Size 10 10+ pos `shouldBe` (0, 0)+ let LayoutGrid (_, _) pxGrid pxCells = boxLayout zeroBox {+ size = Size 100 100+ } (LayoutGrid () (buildGrid [Left $ Percent 0.5] [Left $ Percent 0.5])+ [(GridItem 0 1 0 1 (Size Start Start) lengthBox, zeroCell)]) True+ let LayoutFlow (pos, _) _ _ = snd $ head pxCells+ containerSize pxGrid `shouldBe` Size 50 50+ pos `shouldBe` (0, 0)+ let LayoutGrid (_, _) pxGrid pxCells = boxLayout zeroBox {+ size = Size 100 100+ } (LayoutGrid () (buildGrid [Left Auto] [Left Auto])+ [(GridItem 0 1 0 1 (Size Start Start) lengthBox, nonzeroCell)]) True+ let LayoutFlow (pos, _) _ _ = snd $ head pxCells+ containerSize pxGrid `shouldBe` Size 20 10 -- FIXME Is the 10 correct?+ pos `shouldBe` (0, 0)+ let LayoutGrid (_, _) pxGrid pxCells = boxLayout zeroBox {+ size = Size 100 100+ } (LayoutGrid () (buildGrid [Left Preferred] [Left Preferred])+ [(GridItem 0 1 0 1 (Size Start Start) lengthBox, nonzeroCell)]) True+ let LayoutFlow (pos, _) _ _ = snd $ head pxCells+ containerSize pxGrid `shouldBe` Size 20 0 -- FIXME Is the 0 correct?+ pos `shouldBe` (0, 0)+ let LayoutGrid (_, _) pxGrid pxCells = boxLayout zeroBox {+ size = Size 100 100+ } (LayoutGrid () (buildGrid [Left Min] [Left Min])+ [(GridItem 0 1 0 1 (Size Start Start) lengthBox, nonzeroCell)]) True+ let LayoutFlow (pos, _) _ _ = snd $ head pxCells+ containerSize pxGrid `shouldBe` Size 10 10+ pos `shouldBe` (0, 0) -}++runMath = flip evalCalc [] . mapCalc fst . flip parseCalc [] . filter (/= Whitespace) . tokenize++instance PropertyParser () where+ temp = ()+ inherit _ = ()+ longhand _ _ _ _ = Nothing