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props.ml
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(*********************************************************************************) (* OCaml-Stk *) (* *) (* Copyright (C) 2023-2024 INRIA All rights reserved. *) (* Author: Maxence Guesdon, INRIA Saclay *) (* *) (* This program is free software; you can redistribute it and/or modify *) (* it under the terms of the GNU General Public License as *) (* published by the Free Software Foundation, version 3 of the License. *) (* *) (* This program is distributed in the hope that it will be useful, *) (* but WITHOUT ANY WARRANTY; without even the implied warranty of *) (* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *) (* GNU General Public License for more details. *) (* *) (* You should have received a copy of the GNU General Public *) (* License along with this program; if not, write to the Free Software *) (* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA *) (* 02111-1307 USA *) (* *) (* As a special exception, you have permission to link this program *) (* with the OCaml compiler and distribute executables, as long as you *) (* follow the requirements of the GNU GPL in regard to all of the *) (* software in the executable aside from the OCaml compiler. *) (* *) (* Contact: Maxence.Guesdon@inria.fr *) (* *) (*********************************************************************************) (** Stk properties from CSS properties. *) let of_css_length = function | (n,`px) -> Some (truncate n) | _ -> None let get_css_length props p = match Css.(C.get props p) with | `Length x -> of_css_length x | _ -> None let color_of_system_color = ref (function _ -> Stk.Color.black) let color_of_css p prop = match Css.C.get p prop with | `Rgba (r,g,b,a) -> Stk.Color.of_rgba_0_1 r g b a | `Named_color str -> Stk.Color.of_string str | `System_color c -> !color_of_system_color c | `Transparent -> Stk.Color.transparent | _ -> Stk.Color.black let fg_color_of_css p = color_of_css p Css.P.color let bg_color_of_css p = color_of_css p Css.P.background_color let font_bold_of_css p = match Css.(C.get p P.font_weight) with | `Weight n -> n >= 700 | `Bold -> true | _ -> false let font_family_of_generic = ref (function | `Monospace | `Ui_monospace -> "DejaVu Sans Mono" | `Math -> "DejaVu Serif" | `Cursive | `Emoji | `Fantasy |`Fangsong | `Sans_serif | `Serif | `System_ui | `Ui_rounded | `Ui_sans_serif | `Ui_serif -> "Liberation Sans") let font_family_map = ref (fun name -> match String.lowercase_ascii name with | "courier" -> "DejaVu Sans Mono" | "computer modern" -> "DejaVu Serif" | _ -> name ) let font_family_of_css = let rec iter = function | `Family name :: q -> let name2 = !font_family_map name in if name <> name2 then Log.info (fun m -> m "mapping font %S to %S" name name2); if Stk.Font.family_is_available name2 then name2 else iter q | `Generic g :: _ -> !font_family_of_generic g | _ -> "Liberation Sans" in fun p -> iter Css.(C.get p P.font_family) let font_italic_of_css p = Css.(C.get p P.font_style) = `Italic let font_kerning_of_css p = match Css.(C.get p P.font_kerning) with | `Auto|`Normal -> true | `None -> false let font_size_of_css p = match get_css_length p Css.P.font_size with | Some n -> n | _ -> 12 let font_desc_of_css_props p = let size = font_size_of_css p in let italic = font_italic_of_css p in let bold = font_bold_of_css p in let underline = false in let strikethrough = false in let kerning = font_kerning_of_css p in let outline = 0 in let family = font_family_of_css p in Stk.Font.font_desc ~size ~italic ~bold ~underline ~strikethrough ~kerning ~outline family let max_abs_width_of_css p = get_css_length p Css.P.max_width let border_widths_of_css = let f p prop = match get_css_length p prop with | Some n -> n | None -> 0 in fun p -> Stk.Props.trbl ~top:(f p Css.P.border_top_width) ~right:(f p Css.P.border_right_width) ~bottom:(f p Css.P.border_bottom_width) ~left:(f p Css.P.border_left_width) let has_border p (prop : (Css.T.line_style Css.P.prop)) = match Css.C.get p prop with | `None | `Hidden -> false | _ -> true let border_colors_of_css = let f p s c = if has_border p s then color_of_css p c else Stk.Color.transparent in fun p -> Stk.Props.trbl ~top:Css.P.(f p border_top_style border_top_color) ~right:Css.P.(f p border_right_style border_right_color) ~bottom:Css.P.(f p border_bottom_style border_bottom_color) ~left:Css.P.(f p border_left_style border_left_color) let margins_of_css = let f p prop = match get_css_length p prop with | Some n -> n | None -> 0 in fun p -> Stk.Props.trbl ~top:(f p Css.P.margin_top) ~right:(f p Css.P.margin_right) ~bottom:(f p Css.P.margin_bottom) ~left:(f p Css.P.margin_left) let paddings_of_css = let f p prop = match get_css_length p prop with | Some n -> n | None -> 0 in fun p -> Stk.Props.trbl ~top:(f p Css.P.padding_top) ~right:(f p Css.P.padding_right) ~bottom:(f p Css.P.padding_bottom) ~left:(f p Css.P.padding_left) let text_valign_of_css p = match Css.(C.get p P.vertical_align) with | `Baseline -> Stk.Props.Baseline | `Sub -> Sub | `Super -> Super | `Top -> Top | `Text_top -> Text_top | `Middle -> Middle | `Bottom -> Bottom | `Text_bottom -> Text_bottom | x -> Log.warn (fun m -> m "text_valign: css value not handled: %a" Css.T.pp_vertical_align x); Baseline let props_of_css_props props = let module P = Stk.Props in let p = P.create () in P.(set p font_desc (font_desc_of_css_props props)); P.(set p fg_color (fg_color_of_css props)); let bg_color = match bg_color_of_css props with | c when c = Stk.Color.transparent -> None (* use this to see all background rects: (Int32.of_string "0xaa000011")*) | x -> Some x in (match bg_color with | None -> P.(set p fill false); | Some col -> P.(set p fill true); P.(set p bg_fill_borders true); P.(set p bg_color col) ); let text_valign = text_valign_of_css props in P.(set p text_valign) text_valign; let margins = margins_of_css props in P.(set p margin) margins; let paddings = paddings_of_css props in P.(set p padding) paddings; let collapse_spaces, wrap_on_break, wrap = match Css.(C.get props P.white_space) with | `Normal -> (true, false, true) | `Nowrap -> (true, false, false) | `Pre -> (false, true, false) | `Pre_line -> (true, true, true) | `Pre_wrap | `Break_spaces -> (false, true, true) in P.(set p Stk.Flex.collapse_spaces) collapse_spaces; P.(set p Stk.Flex.wrap_on_break) wrap_on_break ; P.(set p Stk.Flex.wrap) wrap; let justification = match Css.(C.get props P.text_align) with | `Start | `Left -> `Start | `End | `Right -> `End | `Center -> `Center | `Justify | `Justify_all -> if collapse_spaces then `Justified else `Start | x -> Log.warn (fun m -> m "text-align value not computed: %a" Css.T.pp_text_align x); `Start in P.(set p Stk.Flex.justification) justification; let items_alignment = `Baseline in P.(set p Stk.Flex.items_alignment) items_alignment ; P.(set p visible) (Css.(C.get props P.display) <> `None); let opa = let f = match Css.(C.get props P.opacity) with | `Factor f -> f | `Percent p -> p /. 100. in if f < 1. then Some (max 0. f) else None in P.(set_opt p opacity opa); (match Css.(C.get props P.border_collapse) with | `Collapse -> P.set p Stk.Table.row_inter_padding 0; P.set p Stk.Table.column_inter_padding 0; | `Separate -> let (x,y) = Css.(C.get props P.border_spacing) in let x = of_css_length x in let y = of_css_length y in Option.iter (P.set p Stk.Table.row_inter_padding) y; Option.iter (P.set p Stk.Table.column_inter_padding) x; ); p