computed.rs

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

use color::{Color, rgba};
use units::{Length, Px, Em};
use netsurfcss::util::css_fixed_to_float;
use std::either::{Either, Left, Right};
use n;
use values::*;

pub struct ComputedStyle<'self> {
    inner: n::c::CssComputedStyle<'self>
}

impl<'self> ComputedStyle<'self> {

    // CSS 2.1, Section 8 - Box model

    pub fn margin_top(&self) -> CSSValue<CSSMargin> {
        convert_net_margin(self.inner.margin_top())
    }

    pub fn margin_right(&self) -> CSSValue<CSSMargin> {
        convert_net_margin(self.inner.margin_right())
    }

    pub fn margin_bottom(&self) -> CSSValue<CSSMargin> {
        convert_net_margin(self.inner.margin_bottom())
    }

    pub fn margin_left(&self) -> CSSValue<CSSMargin> {
        convert_net_margin(self.inner.margin_left())
    }

    pub fn padding_top(&self) -> CSSValue<CSSPadding> {
        convert_net_padding(self.inner.padding_top())
    }

    pub fn padding_right(&self) -> CSSValue<CSSPadding> {
        convert_net_padding(self.inner.padding_right())
    }

    pub fn padding_bottom(&self) -> CSSValue<CSSPadding> {
        convert_net_padding(self.inner.padding_bottom())
    }

    pub fn padding_left(&self) -> CSSValue<CSSPadding> {
        convert_net_padding(self.inner.padding_left())
    }

    pub fn border_top_width(&self) -> CSSValue<CSSBorderWidth> {
        convert_net_border_width(self.inner.border_top_width())
    }

    pub fn border_right_width(&self) -> CSSValue<CSSBorderWidth> {
        convert_net_border_width(self.inner.border_right_width())
    }

    pub fn border_bottom_width(&self) -> CSSValue<CSSBorderWidth> {
        convert_net_border_width(self.inner.border_bottom_width())
    }

    pub fn border_left_width(&self) -> CSSValue<CSSBorderWidth> {
        convert_net_border_width(self.inner.border_left_width())
    }

    pub fn border_top_color(&self) -> CSSValue<Color> {
        convert_net_color_value(self.inner.border_top_color())
    }

    pub fn border_right_color(&self) -> CSSValue<Color> {
        convert_net_color_value(self.inner.border_right_color())
    }

    pub fn border_bottom_color(&self) -> CSSValue<Color> {
        convert_net_color_value(self.inner.border_bottom_color())
    }

    pub fn border_left_color(&self) -> CSSValue<Color> {
        convert_net_color_value(self.inner.border_left_color())
    }

    // CSS 2.1, Section 9 - Visual formatting model

    pub fn display(&self, root: bool) -> CSSValue<CSSDisplay> {
        convert_net_display_value(self.inner.display(root))
    }

    pub fn position(&self) -> CSSValue<CSSPosition> {
        convert_net_position_value(self.inner.position())
    }

    pub fn float(&self) -> CSSValue<CSSFloat> {
        convert_net_float_value(self.inner.float())
    }

    pub fn clear(&self) -> CSSValue<CSSClear> {
        convert_net_clear_value(self.inner.clear())
    }

    // CSS 2.1, Section 10 - Visual formatting model details

    pub fn width(&self) -> CSSValue<CSSWidth> {
        convert_net_width_value(self.inner.width())
    }

    pub fn height(&self) -> CSSValue<CSSHeight> {
        convert_net_height_value(self.inner.height())
    }

    pub fn line_height(&self) -> CSSValue<CSSLineHeight> {
        convert_net_line_height_value(self.inner.line_height())
    }

    pub fn vertical_align(&self) -> CSSValue<CSSVerticalAlign> {
        convert_net_vertical_align_value(self.inner.vertical_align())
    }

    // CSS 2.1, Section 11 - Visual effects

    // CSS 2.1, Section 12 - Generated content, automatic numbering, and lists

    // CSS 2.1, Section 13 - Paged media

    // CSS 2.1, Section 14 - Colors and Backgrounds

    pub fn background_color(&self) -> CSSValue<Color> {
        convert_net_color_value(self.inner.background_color())
    }

    pub fn color(&self) -> CSSValue<Color> {
        convert_net_color_value(self.inner.color())
    }

    // CSS 2.1, Section 15 - Fonts

    pub fn font_family(&self) -> CSSValue<~[CSSFontFamily]> {
        convert_net_font_family_value(self.inner.font_family())
    }

    pub fn font_style(&self) -> CSSValue<CSSFontStyle> {
        convert_net_font_style_value(self.inner.font_style())
    }

    pub fn font_weight(&self) -> CSSValue<CSSFontWeight> {
        convert_net_font_weight_value(self.inner.font_weight())
    }

    pub fn font_size(&self) -> CSSValue<CSSFontSize> {
        convert_net_font_size_value(self.inner.font_size())
    }

    // CSS 2.1, Section 16 - Text

    pub fn text_align(&self) -> CSSValue<CSSTextAlign> {
        convert_net_text_align_value(self.inner.text_align())
    }

    pub fn text_decoration(&self) -> CSSValue<CSSTextDecoration> {
        convert_net_text_decoration_value(self.inner.text_decoration())
    }

    // CSS 2.1, Section 17 - Tables

    // CSS 2.1, Section 18 - User interface

}

fn convert_net_color(color: n::t::CssColor) -> Color {
    rgba(color.r, color.g, color.b, (color.a as float) / 255.0)
}

fn convert_net_color_value(color: n::v::CssColorValue) -> CSSValue<Color> {
    match color {
        n::v::CssColorInherit => Inherit,
        n::v::CssColorColor(v) => Specified(convert_net_color(v))
    }
}

fn convert_net_border_width(width: n::v::CssBorderWidthValue) -> CSSValue<CSSBorderWidth> {
    match width {
        n::v::CssBorderWidthInherit => Inherit,
        n::v::CssBorderWidthThin => Specified(CSSBorderWidthThin),
        n::v::CssBorderWidthMedium => Specified(CSSBorderWidthMedium),
        n::v::CssBorderWidthThick => Specified(CSSBorderWidthThick),
        n::v::CssBorderWidthWidth(width) => Specified(CSSBorderWidthLength(convert_net_unit_to_length(width))),
    }
}

fn convert_net_margin(margin: n::v::CssMarginValue) -> CSSValue<CSSMargin> {
    match margin {
        n::v::CssMarginInherit => Inherit,
        n::v::CssMarginSet(value) => {
            let length = convert_net_unit_to_length_or_percent(value);
            match length {
                Left(abs) => Specified(CSSMarginLength(abs)),
                Right(percent) => Specified(CSSMarginPercentage(percent))
            }
        }
        n::v::CssMarginAuto => Specified(CSSMarginAuto)
    }
}

fn convert_net_padding(padding: n::v::CssPaddingValue) -> CSSValue<CSSPadding> {
    match padding {
        n::v::CssPaddingInherit => Inherit,
        n::v::CssPaddingSet(value) => {
            let length = convert_net_unit_to_length_or_percent(value);
            match length {
                Left(abs) => Specified(CSSPaddingLength(abs)),
                Right(percent) => Specified(CSSPaddingPercentage(percent))
            }
        }
    }
}

fn convert_net_width_value(value: n::v::CssWidthValue) -> CSSValue<CSSWidth> {
    match value {
        n::v::CssWidthInherit => Inherit,
        n::v::CssWidthSet(value) => {
            let length = convert_net_unit_to_length_or_percent(value);
            match length {
                Left(abs) => Specified(CSSWidthLength(abs)),
                Right(percent) => Specified(CSSWidthPercentage(percent))
            }
        }
        n::v::CssWidthAuto => Specified(CSSWidthAuto)
    }
}

fn convert_net_height_value(value: n::v::CssHeightValue) -> CSSValue<CSSHeight> {
    match value {
        n::v::CssHeightInherit => Inherit,
        n::v::CssHeightSet(value) => {
            let length = convert_net_unit_to_length_or_percent(value);
            match length {
                Left(abs) => Specified(CSSHeightLength(abs)),
                Right(percent) => Specified(CSSHeightPercentage(percent))
            }
        }
        n::v::CssHeightAuto => Specified(CSSHeightAuto)
    }
}

fn convert_net_display_value(value: n::v::CssDisplayValue) -> CSSValue<CSSDisplay> {
    match value {
        n::v::CssDisplayInherit => Inherit,
        n::v::CssDisplayInline => Specified(CSSDisplayInline),
        n::v::CssDisplayBlock => Specified(CSSDisplayBlock),
        n::v::CssDisplayListItem => Specified(CSSDisplayListItem),
        n::v::CssDisplayRunIn => unimpl("display: run-in"), // FIXME: Not in CSS 2.1
        n::v::CssDisplayInlineBlock => Specified(CSSDisplayInlineBlock),
        n::v::CssDisplayTable => Specified(CSSDisplayTable),
        n::v::CssDisplayInlineTable => Specified(CSSDisplayInlineTable),
        n::v::CssDisplayTableRowGroup => Specified(CSSDisplayTableRowGroup),
        n::v::CssDisplayTableHeaderGroup => Specified(CSSDisplayTableHeaderGroup),
        n::v::CssDisplayTableFooterGroup => Specified(CSSDisplayTableFooterGroup),
        n::v::CssDisplayTableRow => Specified(CSSDisplayTableRow),
        n::v::CssDisplayTableColumnGroup => Specified(CSSDisplayTableColumnGroup),
        n::v::CssDisplayTableColumn => Specified(CSSDisplayTableColumn),
        n::v::CssDisplayTableCell => Specified(CSSDisplayTableCell),
        n::v::CssDisplayTableCaption => Specified(CSSDisplayTableCaption),
        n::v::CssDisplayNone => Specified(CSSDisplayNone)
    }
}

fn convert_net_float_value(value: n::v::CssFloatValue) -> CSSValue<CSSFloat> {
    match value {
        n::v::CssFloatInherit => Inherit,
        n::v::CssFloatLeft => Specified(CSSFloatLeft),
        n::v::CssFloatRight => Specified(CSSFloatRight),
        n::v::CssFloatNone => Specified(CSSFloatNone)
    }
}

fn convert_net_clear_value(value: n::v::CssClearValue) -> CSSValue<CSSClear> {
    match value {
        n::v::CssClearInherit => Inherit,
        n::v::CssClearNone => Specified(CSSClearNone),
        n::v::CssClearLeft => Specified(CSSClearLeft),
        n::v::CssClearRight => Specified(CSSClearRight),
        n::v::CssClearBoth => Specified(CSSClearBoth)
    }
}

fn convert_net_position_value(value: n::v::CssPositionValue) -> CSSValue<CSSPosition> {
    match value {
        n::v::CssPositionInherit => Inherit,
        n::v::CssPositionStatic => Specified(CSSPositionStatic),
        n::v::CssPositionRelative => Specified(CSSPositionRelative),
        n::v::CssPositionAbsolute => Specified(CSSPositionAbsolute),
        n::v::CssPositionFixed => Specified(CSSPositionFixed)
    }
}

fn convert_net_font_family_value(value: n::v::CssFontFamilyValue) -> CSSValue<~[CSSFontFamily]> {
    use units::{Serif, SansSerif, Cursive, Fantasy, Monospace};

    match value {
        n::v::CssFontFamilyInherit => Inherit,
        n::v::CssFontFamilySerif => Specified(~[CSSFontFamilyGenericFamily(Serif)]),
        n::v::CssFontFamilySansSerif => Specified(~[CSSFontFamilyGenericFamily(SansSerif)]),
        n::v::CssFontFamilyCursive => Specified(~[CSSFontFamilyGenericFamily(Cursive)]),
        n::v::CssFontFamilyFantasy => Specified(~[CSSFontFamilyGenericFamily(Fantasy)]),
        n::v::CssFontFamilyMonospace => Specified(~[CSSFontFamilyGenericFamily(Monospace)]),
        n::v::CssFontFamilyValue(names) => Specified(names.map(|n| CSSFontFamilyFamilyName(n.to_str()) ))
    }
}

fn convert_net_font_size_value(value: n::v::CssFontSizeValue) -> CSSValue<CSSFontSize> {
    use units::*;

    match value {
        n::v::CssFontSizeInherit => Inherit,
        n::v::CssFontSizeXXSmall => Specified(CSSFontSizeAbsoluteSize(XXSmall)),
        n::v::CssFontSizeXSmall => Specified(CSSFontSizeAbsoluteSize(XSmall)),
        n::v::CssFontSizeSmall => Specified(CSSFontSizeAbsoluteSize(Small)),
        n::v::CssFontSizeMedium => Specified(CSSFontSizeAbsoluteSize(Medium)),
        n::v::CssFontSizeLarge => Specified(CSSFontSizeAbsoluteSize(Large)),
        n::v::CssFontSizeXLarge => Specified(CSSFontSizeAbsoluteSize(XLarge)),
        n::v::CssFontSizeXXLarge => Specified(CSSFontSizeAbsoluteSize(XXLarge)),
        n::v::CssFontSizeLarger => Specified(CSSFontSizeRelativeSize(Larger)),
        n::v::CssFontSizeSmaller => Specified(CSSFontSizeRelativeSize(Smaller)),
        n::v::CssFontSizeDimension(size) => {
            match convert_net_unit_to_length_or_percent(size) {
                Left(val) => Specified(CSSFontSizeLength(val)),
                Right(val) => Specified(CSSFontSizePercentage(val))
            }
        }
    }
}

fn convert_net_font_style_value(value: n::v::CssFontStyleValue) -> CSSValue<CSSFontStyle> {
    match value {
        n::v::CssFontStyleInherit => Inherit,
        n::v::CssFontStyleNormal => Specified(CSSFontStyleNormal),
        n::v::CssFontStyleItalic => Specified(CSSFontStyleItalic),
        n::v::CssFontStyleOblique => Specified(CSSFontStyleOblique)
    }
}

fn convert_net_font_weight_value(value: n::v::CssFontWeightValue) -> CSSValue<CSSFontWeight> {
    match value {
        n::v::CssFontWeightInherit => Inherit,
        n::v::CssFontWeightNormal => Specified(CSSFontWeightNormal),
        n::v::CssFontWeightBold => Specified(CSSFontWeightBold),
        n::v::CssFontWeightBolder => Specified(CSSFontWeightBolder),
        n::v::CssFontWeightLighter => Specified(CSSFontWeightLighter),
        n::v::CssFontWeight100 => Specified(CSSFontWeight100),
        n::v::CssFontWeight200 => Specified(CSSFontWeight200),
        n::v::CssFontWeight300 => Specified(CSSFontWeight300),
        n::v::CssFontWeight400 => Specified(CSSFontWeight400),
        n::v::CssFontWeight500 => Specified(CSSFontWeight500),
        n::v::CssFontWeight600 => Specified(CSSFontWeight600),
        n::v::CssFontWeight700 => Specified(CSSFontWeight700),
        n::v::CssFontWeight800 => Specified(CSSFontWeight800),
        n::v::CssFontWeight900 => Specified(CSSFontWeight900),
    }
}

fn convert_net_text_align_value(value: n::v::CssTextAlignValue) -> CSSValue<CSSTextAlign> {
    match value {
        n::v::CssTextAlignInherit => Inherit,
        n::v::CssTextAlignInheritIfNonMagic => unimpl("inherit if non-magic? wtf?"),
        n::v::CssTextAlignLeft => Specified(CSSTextAlignLeft),
        n::v::CssTextAlignRight => Specified(CSSTextAlignRight),
        n::v::CssTextAlignCenter => Specified(CSSTextAlignCenter),
        n::v::CssTextAlignJustify => Specified(CSSTextAlignJustify),
        n::v::CssTextAlignDefault => Specified(CSSTextAlignLeft),
        n::v::CssTextAlignLibcssLeft => unimpl("text-align libcss left"),
        n::v::CssTextAlignLibcssCenter => unimpl("text-align libcss center"),
        n::v::CssTextAlignLibcssRight => unimpl("text-align libcss right"),
    }
}

fn convert_net_text_decoration_value(value: n::v::CssTextDecorationValue) -> CSSValue<CSSTextDecoration> {
    match value {
        n::v::CssTextDecorationInherit => Inherit,
        n::v::CssTextDecorationNone => Specified(CSSTextDecorationNone),
        n::v::CssTextDecorationBlink => Specified(CSSTextDecorationBlink),
        n::v::CssTextDecorationLineThrough => Specified(CSSTextDecorationLineThrough),
        n::v::CssTextDecorationOverline => Specified(CSSTextDecorationOverline),
        n::v::CssTextDecorationUnderline => Specified(CSSTextDecorationUnderline),
    }
}

fn convert_net_line_height_value(value: n::v::CssLineHeightValue) -> CSSValue<CSSLineHeight> {
    match value {
        n::v::CssLineHeightInherit => Inherit,
        n::v::CssLineHeightNumber(n) => Specified(CSSLineHeightNumber(css_fixed_to_float(n))),
        n::v::CssLineHeightDimension(v) => {
            match convert_net_unit_to_length_or_percent(v) {
                Left(val) => Specified(CSSLineHeightLength(val)),
                Right(val) => Specified(CSSLineHeightPercentage(val))
            }
        },
        n::v::CssLineHeightNormal => Specified(CSSLineHeightNormal)
    }
}

fn convert_net_vertical_align_value(value: n::v::CssVerticalAlignValue) -> CSSValue<CSSVerticalAlign> {
    match value {
        n::v::CssVerticalAlignInherit => Inherit,
        n::v::CssVerticalAlignBaseline => Specified(CSSVerticalAlignBaseline),
        n::v::CssVerticalAlignSub => Specified(CSSVerticalAlignSub),
        n::v::CssVerticalAlignSuper => Specified(CSSVerticalAlignSuper),
        n::v::CssVerticalAlignTop => Specified(CSSVerticalAlignTop),
        n::v::CssVerticalAlignTextTop => Specified(CSSVerticalAlignTextTop),
        n::v::CssVerticalAlignMiddle => Specified(CSSVerticalAlignMiddle),
        n::v::CssVerticalAlignBottom => Specified(CSSVerticalAlignBottom),
        n::v::CssVerticalAlignTextBottom => Specified(CSSVerticalAlignTextBottom),
        n::v::CssVerticalAlignDimension(v) => {
            match convert_net_unit_to_length_or_percent(v) {
                Left(val) => Specified(CSSVerticalAlignLength(val)),
                Right(val) => Specified(CSSVerticalAlignPercentage(val))
            }
        }
    }
}

fn convert_net_unit_to_length(unit: n::t::CssUnit) -> Length {
    match convert_net_unit_to_length_or_percent(unit) {
        Left(v) => v,
        Right(*) => fail!(~"unexpected percentage unit"),
    }
}

fn convert_net_unit_to_length_or_percent(unit: n::t::CssUnit) -> Either<Length, float> {
    match unit {
        n::t::CssUnitPx(l) => Left(Px(css_fixed_to_float(l))),
        n::t::CssUnitEm(l) => Left(Em(css_fixed_to_float(l))),
        n::t::CssUnitPt(l) => Left(Px(css_fixed_to_float(l) / 72f * 96f)),
        n::t::CssUnitCm(l) => Left(Px(css_fixed_to_float(l) / 2.54f * 96f)),
        n::t::CssUnitMm(l) => Left(Px(css_fixed_to_float(l) / 25.4f * 96f)),
        n::t::CssUnitIn(l) => Left(Px(css_fixed_to_float(l) / 1f * 96f)),
        n::t::CssUnitPc(l) => Left(Px(css_fixed_to_float(l) / 6f * 96f)),
        n::t::CssUnitPct(p) => Right(css_fixed_to_float(p)),
        _ => unimpl("unit")
    }
}

fn unimpl(what: &str) -> ! {
    fail!(fmt!("css unimplemented %?", what))
}