netsurfcss.rc

// Copyright 2013 The Servo Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#[link(name = "netsurfcss",
       vers = "0.1")];
#[crate_type = "lib"];

extern mod extra;
extern mod wapcaplet;

use std::libc::{c_void, size_t};
use std::libc;
use std::ptr;
use ll::errors::*;
use errors::CssError;
use util::VoidPtrLike;

use conversions::c_enum_to_rust_enum;

pub use self::properties::CssProperty;

pub mod ll;
pub mod conversions;
pub mod test;
pub mod util;

// FIXME: Trait inheritance still busted
//trait DomNode: VoidPtrLike {
//}

fn ll_result_to_rust_result<T>(code: css_error, val: T) -> CssResult<T> {
    match code {
        e if e == CSS_OK => Ok(val),
        _ => Err(c_enum_to_rust_enum(code))
    }
}

pub type CssResult<T> = Result<T, CssError>;

pub fn require_ok(code: css_error, what: &str) {
    match code {
        e if e == CSS_OK => (),
        e => fail!(fmt!("CSS parsing failed while %s. code: %?", what, e))
    }
}

pub fn realloc(ptr: *mut c_void, len: size_t, _pw: *c_void) -> *mut c_void {
    unsafe {
        if len == 0 {
            // Needed to prevent a memory leak on Mac.
            libc::free(&*ptr);
            ptr::mut_null()
        } else {
            libc::realloc(ptr, len)
        }
    }
}

pub extern fn realloc_ext(ptr: *mut c_void, len: size_t, pw: *c_void) -> *mut c_void {
    realloc(ptr, len, pw)
}

pub mod types {
    use wapcaplet::LwcString;
    use ll::stylesheet::css_fixed;
    use ll::hint::css_hint_length;
    use conversions::ToLl;
    
    pub enum CssLanguageLevel {
        CssLevel1,
        CssLevel2,
        CssLevel21,
        CssLevel3,
        CssLevelDefault, // NB: This is not the same as the ll value
        // NB: Sentinal variant to prevent the naive transmute conversion from working
        CssLevelNotACLikeEnum(uint)
    }

    // NB: This must have the same binary structure as css_color
    pub struct CssColor { b: u8, g: u8, r: u8, a: u8 }

    pub struct CssQName {
        ns: Option<LwcString>,
        name: LwcString
    }

    pub enum CssUnit {
        CssUnitPx(css_fixed),
        CssUnitEx(css_fixed),
        CssUnitEm(css_fixed),
        CssUnitIn(css_fixed),
        CssUnitCm(css_fixed),
        CssUnitMm(css_fixed),
        CssUnitPt(css_fixed),
        CssUnitPc(css_fixed),
        CssUnitPct(css_fixed),
        CssUnitDeg(css_fixed),
        CssUnitGrad(css_fixed),
        CssUnitRad(css_fixed),
        CssUnitMs(css_fixed),
        CssUnitS(css_fixed),
        CssUnitHz(css_fixed),
        CssUnitKHz(css_fixed)
    }

    impl CssUnit {
        pub fn to_ll_css_hint_length(&self) -> css_hint_length {
            let (unit, value) = self.to_ll();
            css_hint_length {
                value: value,
                unit: unit
            }
        }

        pub fn to_css_fixed(&self) -> css_fixed {
            match *self {
                CssUnitPx(css_fixed) |
                CssUnitEx(css_fixed) |
                CssUnitEm(css_fixed) |
                CssUnitIn(css_fixed) |
                CssUnitCm(css_fixed) |
                CssUnitMm(css_fixed) |
                CssUnitPt(css_fixed) |
                CssUnitPc(css_fixed) |
                CssUnitPct(css_fixed) |
                CssUnitDeg(css_fixed) |
                CssUnitGrad(css_fixed) |
                CssUnitRad(css_fixed) |
                CssUnitMs(css_fixed) |
                CssUnitS(css_fixed) |
                CssUnitHz(css_fixed) |
                CssUnitKHz(css_fixed) => css_fixed
            }
        }

        pub fn modify(&self, new_value: css_fixed) -> CssUnit {
            match *self {
                CssUnitPx(_) => CssUnitPx(new_value),
                CssUnitEx(_) => CssUnitEx(new_value),
                CssUnitEm(_) => CssUnitEm(new_value),
                CssUnitIn(_) => CssUnitIn(new_value),
                CssUnitCm(_) => CssUnitCm(new_value),
                CssUnitMm(_) => CssUnitMm(new_value),
                CssUnitPt(_) => CssUnitPt(new_value),
                CssUnitPc(_) => CssUnitPc(new_value),
                CssUnitPct(_) => CssUnitPct(new_value),
                CssUnitDeg(_) => CssUnitDeg(new_value),
                CssUnitGrad(_) => CssUnitGrad(new_value),
                CssUnitRad(_) => CssUnitRad(new_value),
                CssUnitMs(_) => CssUnitMs(new_value),
                CssUnitS(_) => CssUnitS(new_value),
                CssUnitHz(_) => CssUnitHz(new_value),
                CssUnitKHz(_) => CssUnitKHz(new_value),
            }
        }
    }
}

pub mod errors {
    pub enum CssError {
	CssOk               = 0,
	CssNoMem            = 1,
	CssBadParm          = 2,
	CssInvalid          = 3,
	CssFileNotFound     = 4,
	CssNeedData         = 5,
	CssBadCharset       = 6,
	CssEof              = 7,
	CssImportsPending   = 8,
	CssPropertyNotSet   = 9
    }
}

pub mod stylesheet {
    use std::cast::transmute;
    use std::ptr::{null, to_unsafe_ptr, to_mut_unsafe_ptr};
    use std::libc::size_t;
    use std::libc::types::common::c99::uint64_t;
    use std::vec;
    use wapcaplet::LwcString;
    use properties::{CssFontStyle, CssFontVariant, CssFontWeight};
    use types::{CssLanguageLevel, CssColor};
    use conversions::AsLl;
    use ll::stylesheet::*;
    use ll_css_stylesheet_create = ll::stylesheet::css_stylesheet_create;
    use CssResult;
    use require_ok;
    use realloc_ext;
    use ll::errors::CSS_NEEDDATA;

    pub struct CssStylesheetParams {
        params_version: CssStylesheetParamsVersion,
        level: CssLanguageLevel,
        charset: ~str,
        url: ~str,
        title: ~str,
        allow_quirks: bool,
        inline_style: bool,
        resolve: Option<CssUrlResolutionFn>,
        import: Option<CssImportNotificationFn>,
        color: Option<CssColorResolutionFn>,
        font: Option<CssFontResolutionFn>,
    }

    pub enum CssStylesheetParamsVersion {
        CssStylesheetParamsVersion1 = 1
    }

    pub type CssUrlResolutionFn = ~fn(base: &str, rel: &LwcString) -> CssResult<LwcString>;
    pub type CssImportNotificationFn = ~fn(parent: &CssStylesheet, url: &LwcString) -> CssResult<uint64_t>;
    pub type CssColorResolutionFn = ~fn(name: &LwcString) -> CssResult<CssColor>;
    pub type CssFontResolutionFn = ~fn(name: &LwcString) -> CssResult<CssSystemFont>;

    pub struct CssSystemFont {
        style: CssFontStyle,
        variant: CssFontVariant,
        weight: CssFontWeight,
        size: css_size,
        line_height: css_size,
        family: ~str
    }

    // Note that this must behave as if it is freezable
    pub struct CssStylesheet {
        priv sheet: *css_stylesheet,
    }

    impl Drop for CssStylesheet {
        fn drop(&self) {
            assert!(self.sheet.is_not_null());
            let code = unsafe { css_stylesheet_destroy(self.sheet) };
            require_ok(code, "destroying stylesheet");
        }
    }

    pub fn css_stylesheet_create(params: &CssStylesheetParams) -> CssStylesheet {
        let sheet = do params.as_ll |ll_params| {
            unsafe {
                let mut sheet: *css_stylesheet = null();
                let code = ll_css_stylesheet_create(
                    to_unsafe_ptr(ll_params), realloc_ext, null(), to_mut_unsafe_ptr(&mut sheet));
                require_ok(code, "creating stylesheet");
                assert!(sheet.is_not_null());
                sheet
            }
        };

        CssStylesheet {
            sheet: sheet
        }
    }

    impl CssStylesheet {
        pub fn size(&self) -> uint {
            unsafe {
                let mut size = 0;
                let code = css_stylesheet_size(self.sheet, to_mut_unsafe_ptr(&mut size));
                require_ok(code, "getting stylesheet size");
                return size as uint;
            }
        }

        pub fn append_data(&mut self, data: &[u8]) {
            // FIXME: For some reason to_const_ptr isn't accessible
            let code = unsafe {
                css_stylesheet_append_data(self.sheet, transmute(vec::raw::to_ptr(data)), data.len() as size_t)
            };
            match code {
                e if e == CSS_NEEDDATA => { /* fine */ },
                _ => require_ok(code, "appending styleshet data")
            }
        }

        pub fn data_done(&mut self) {
            let _code = unsafe { css_stylesheet_data_done(self.sheet) };
            //require_ok(code, "finishing parsing");
        }

        pub fn ll_sheet(&self) -> *css_stylesheet {
            self.sheet
        }
    }

}

pub mod properties {

    use std::libc::types::common::c99::uint32_t;
    use std::cast::transmute;

    pub enum CssProperty {
        CssPropAzimuth			= 0x000,
        CssPropBackgroundAttachment		= 0x001,
        CssPropBackgroundColor		= 0x002,
        CssPropBackgroundImage		= 0x003,
        CssPropBackgroundPosition		= 0x004,
        CssPropBackgroundRepeat		= 0x005,
        CssPropBorderCollapse		= 0x006,
        CssPropBorderSpacing			= 0x007,
        CssPropBorderTopColor		= 0x008,
        CssPropBorderRightColor		= 0x009,
        CssPropBorderBottomColor		= 0x00a,
        CssPropBorderLeftColor		= 0x00b,
        CssPropBorderTopStyle		= 0x00c,
        CssPropBorderRightStyle		= 0x00d,
        CssPropBorderBottomStyle		= 0x00e,
        CssPropBorderLeftStyle		= 0x00f,
        CssPropBorderTopWidth		= 0x010,
        CssPropBorderRightWidth		= 0x011,
        CssPropBorderBottomWidth		= 0x012,
        CssPropBorderLeftWidth		= 0x013,
        CssPropBottom				= 0x014,
        CssPropCaptionSide			= 0x015,
        CssPropClear				= 0x016,
        CssPropClip				= 0x017,
        CssPropColor				= 0x018,
        CssPropContent			= 0x019,
        CssPropCounterIncrement		= 0x01a,
        CssPropCounterReset			= 0x01b,
        CssPropCueAfter			= 0x01c,
        CssPropCueBefore			= 0x01d,
        CssPropCursor				= 0x01e,
        CssPropDirection			= 0x01f,
        CssPropDisplay			= 0x020,
        CssPropElevation			= 0x021,
        CssPropEmptyCells			= 0x022,
        CssPropFloat				= 0x023,
        CssPropFontFamily			= 0x024,
        CssPropFontSize			= 0x025,
        CssPropFontStyle			= 0x026,
        CssPropFontVariant			= 0x027,
        CssPropFontWeight			= 0x028,
        CssPropHeight				= 0x029,
        CssPropLeft				= 0x02a,
        CssPropLetterSpacing			= 0x02b,
        CssPropLineHeight			= 0x02c,
        CssPropListStyleImage		= 0x02d,
        CssPropListStylePosition		= 0x02e,
        CssPropListStyleType		= 0x02f,
        CssPropMarginTop			= 0x030,
        CssPropMarginRight			= 0x031,
        CssPropMarginBottom			= 0x032,
        CssPropMarginLeft			= 0x033,
        CssPropMaxHeight			= 0x034,
        CssPropMaxWidth			= 0x035,
        CssPropMinHeight			= 0x036,
        CssPropMinWidth			= 0x037,
        CssPropOrphans,
        CssPropOutlineColor			= 0x039,
        CssPropOutlineStyle			= 0x03a,
        CssPropOutlineWidth			= 0x03b,
        CssPropOverflow			= 0x03c,
        CssPropPaddingTop			= 0x03d,
        CssPropPaddingRight			= 0x03e,
        CssPropPaddingBottom			= 0x03f,
        CssPropPaddingLeft			= 0x040,
        CssPropPageBreakAfter		= 0x041,
        CssPropPageBreakBefore		= 0x042,
        CssPropPageBreakInside		= 0x043,
        CssPropPauseAfter			= 0x044,
        CssPropPauseBefore			= 0x045,
        CssPropPitchRange			= 0x046,
        CssPropPitch				= 0x047,
        CssPropPlayDuring			= 0x048,
        CssPropPosition			= 0x049,
        CssPropQuotes				= 0x04a,
        CssPropRichness			= 0x04b,
        CssPropRight				= 0x04c,
        CssPropSpeakHeader			= 0x04d,
        CssPropSpeakNumeral			= 0x04e,
        CssPropSpeakPunctuation		= 0x04f,
        CssPropSpeak				= 0x050,
        CssPropSpeechRate			= 0x051,
        CssPropStress				= 0x052,
        CssPropTableLayout			= 0x053,
        CssPropTextAlign			= 0x054,
        CssPropTextDecoration		= 0x055,
        CssPropTextIndent			= 0x056,
        CssPropTextTransform			= 0x057,
        CssPropTop				= 0x058,
        CssPropUnicodeBidi			= 0x059,
        CssPropVerticalAlign			= 0x05a,
        CssPropVisibility			= 0x05b,
        CssPropVoiceFamily			= 0x05c,
        CssPropVolume				= 0x05d,
        CssPropWhiteSpace			= 0x05e,
        CssPropWidows				= 0x05f,
        CssPropWidth				= 0x060,
        CssPropWordSpacing			= 0x061,
        CssPropZIndex			= 0x062,
        CssPropOpacity			= 0x063,
        CssPropBreakAfter			= 0x064,
        CssPropBreakBefore			= 0x065,
        CssPropBreakInside			= 0x066,
        CssPropColumnCount			= 0x067,
        CssPropColumnFill			= 0x068,
        CssPropColumnGap			= 0x069,
        CssPropColumnRuleColor		= 0x06a,
        CssPropColumnRuleStyle		= 0x06b,
        CssPropColumnRuleWidth		= 0x06c,
        CssPropColumnSpan			= 0x06d,
        CssPropClomumnWidth			= 0x06e,
    }

    pub fn property_from_uint(property: uint32_t) -> CssProperty {
        unsafe { transmute(property as uint) }
    }

    pub enum CssFontStyle {
	CssFontStyleInherit			= 0x0,
	CssFontStyleNormal			= 0x1,
	CssFontStyleItalic			= 0x2,
	CssFontStyleOblique			= 0x3
    }

    pub enum CssFontFamily {
	CssFontFamilyInherit			= 0x0,
	/* Named fonts exist if pointer is non-NULL */
	CssFontFamilySerif			= 0x1,
	CssFontFamilySansSerif		= 0x2,
	CssFontFamilyCursive			= 0x3,
	CssFontFamilyFantasy			= 0x4,
	CssFontFamilyMonospace		= 0x5
    }

    pub enum CssFontVariant {
        CssFontVariantInherit = 0,
        CssFontVariantNormal = 1,
        CssFontVariantSmallCaps = 2,
    }

    pub enum CssFontWeight {
	CssFontWeightInherit			= 0x0,
        CssFontWeightNormal			= 0x1,
        CssFontWeightBold			= 0x2,
        CssFontWeightBolder			= 0x3,
        CssFontWeightLighter			= 0x4,
        CssFontWeight100			= 0x5,
        CssFontWeight200			= 0x6,
        CssFontWeight300			= 0x7,
        CssFontWeight400			= 0x8,
        CssFontWeight500			= 0x9,
        CssFontWeight600			= 0xa,
        CssFontWeight700			= 0xb,
        CssFontWeight800			= 0xc,
        CssFontWeight900			= 0xd
    }

    // NB: This is not identical to css_quotes_e
    pub enum CssQuotes {
	CssQuotesInherit,
        CssQuotesString,
        CssQuotesNone,
        // Sentinal value to give this enum a non-word size, so the
        // naive unsafe conversion to ll fails
        CssQuotesNotACLikeEnum(uint)
    }
}

pub mod hint {

    use types::{CssUnit, CssColor};
    use properties::{CssProperty,
                     CssPropFontSize,
                     CssPropFontFamily,
                     CssPropQuotes,
                     CssPropColor,
                     CssFontFamily};
    use conversions::{ToLl, ll_unit_to_hl_unit};
    use wapcaplet::LwcString;
    use wapcaplet::ll::lwc_string;
    use ll::hint::*;
    use ll::properties::*;
    use ll::errors::*;
    use ll::types::css_color;
    use std::ptr::null;
    use std::libc::types::common::c99::uint8_t;
    use std::cast::transmute;
    use std::ptr;

    // An interpretation of the delightful css_hint union
    pub enum CssHint {
        CssHintFontFamily(~[LwcString], CssFontFamily),
        CssHintLength(CssUnit),
        CssHintDefault,
        CssHintUnknown
    }

    impl CssHint {

        pub fn new(property: CssProperty, hint: *css_hint) -> CssHint {
            let status = get_css_hint_status(hint) as u32;
            match property {
                CssPropFontSize => {
                    let length: &css_hint_length = hint_imm_data_field(hint);
                    if status == CSS_FONT_SIZE_DIMENSION {
                        CssHintLength(ll_unit_to_hl_unit(length.unit, length.value))
                    } else {
                        CssHintUnknown
                    }
                }
                _ => fail!(fmt!("unknown css hint: %?", property))
            }
        }
        
        pub fn write_to_ll(&self, property: CssProperty, llhint: *mut css_hint) -> css_error {
            match (property, self) {
                (CssPropFontFamily, &CssHintDefault) => {
                    let strings: &mut **lwc_string = hint_data_field(llhint);
                    *strings = null();
                    set_css_hint_status(llhint, CSS_FONT_FAMILY_SANS_SERIF as uint8_t);
                }
                (CssPropQuotes, &CssHintDefault) => {
                    let strings: &mut **lwc_string = hint_data_field(llhint);
                    *strings = null();
                    set_css_hint_status(llhint, CSS_QUOTES_NONE as uint8_t);
                }
                (CssPropColor, &CssHintDefault) => {
                    let color: &mut css_color = hint_data_field(llhint);
                    *color = CssColor { a: 255, r: 0, g: 0, b: 0 }.to_ll();
                    set_css_hint_status(llhint, CSS_COLOR_COLOR as uint8_t);
                }
                (CssPropFontSize, &CssHintLength(val)) => {
                    let length: &mut css_hint_length = hint_data_field(llhint);
                    *length = val.to_ll_css_hint_length();
                    set_css_hint_status(llhint, CSS_FONT_SIZE_DIMENSION as uint8_t);
                }
                (_, &CssHintUnknown) => {
                    fail!(fmt!("unknown css hint %?", property));
                }
                (_, _) => {
                    fail!(fmt!("incorrectly handled property hint: %?, %?", property, self));
                }
            }

            return CSS_OK;
        }
    }

    fn get_css_hint_status(llhint: *css_hint) -> uint8_t {
        unsafe {
            let llhint_bytes: *mut uint8_t = transmute(llhint);
            let status_field: *mut uint8_t = ptr::mut_offset(llhint_bytes, status_field_offset());
            *status_field
        }
    }

    fn set_css_hint_status(llhint: *mut css_hint, status: uint8_t) {
        // So gnarly. The status field is a uint8_t that comes after a union type.
        // We're just going to calculate it's address and write it
        unsafe {
            let llhint_bytes: *mut uint8_t = transmute(llhint);
            let status_field: *mut uint8_t = ptr::mut_offset(llhint_bytes, status_field_offset());
            *status_field = status;
        }
    }

    #[cfg(target_arch = "x86_64")]
    #[cfg(target_arch = "x86")]
    #[cfg(target_arch = "arm")]
    fn status_field_offset() -> int { 16 }

    fn hint_data_field<T>(llhint: *mut css_hint) -> &mut T {
        unsafe { transmute(llhint) }
    }

    fn hint_imm_data_field<T>(llhint: *css_hint) -> &T {
        unsafe { transmute(llhint) }
    }
}

pub mod select {

    use std::libc;
    use std::libc::c_void;
    use std::libc::types::common::c99::{uint64_t, uint32_t};
    use std::vec;
    use std::sys;
    use std::ptr;
    use ll::types::{css_origin, css_qname};
    use types::CssQName;
    use stylesheet::CssStylesheet;
    use properties::CssProperty;
    use computed::CssComputedStyle;
    use hint::CssHint;
    use util::VoidPtrLike;
    use ll_css_select_ctx_create = ll::select::css_select_ctx_create;
    use ll::select::{css_select_ctx, css_select_ctx_destroy, css_select_ctx_append_sheet, css_select_ctx_count_sheets};
    use ll::select::{css_select_results, css_select_style, css_select_handler};
    use ll::select::{CSS_SELECT_HANDLER_VERSION_1, css_select_results_destroy};
    use require_ok;
    use realloc;
    use realloc_ext;
    use std::ptr::{null, to_mut_unsafe_ptr, to_unsafe_ptr};
    use std::cast::transmute;
    use ll::errors::{css_error, CSS_OK};
    use wapcaplet::ll::lwc_string;
    use ll::hint::css_hint;
    use wapcaplet::LwcString;
    use conversions::{ToLl, write_ll_qname, ll_qname_to_hl_qname};
    use wapcaplet::from_lwc_string;

    pub enum CssPseudoElement {
	CssPseudoElementNone         = 0,
	CssPseudoElementFirstLine   = 1,
	CssPseudoElementFirstLetter = 2,
	CssPseudoElementBefore       = 3,
	CssPseudoElementAfter        = 4,
	CssPseudoElementCount	= 5
    }

    pub struct CssSelectCtx {
        priv select_ctx: *css_select_ctx,
        // Whenever a sheet is added to the select ctx we will take ownership of it
        // to ensure that it stays alive
        priv sheets: ~[CssStylesheet],
    }

    impl Drop for CssSelectCtx {
        fn drop(&self) {
            assert!(self.select_ctx.is_not_null());
            let code = unsafe { css_select_ctx_destroy(self.select_ctx) };
            require_ok(code, "destroying select ctx");
        }
    }

    pub fn css_select_ctx_create() -> CssSelectCtx {
        let mut select_ctx: *css_select_ctx = null();
        let code = unsafe { ll_css_select_ctx_create(realloc_ext, null(), to_mut_unsafe_ptr(&mut select_ctx)) };
        require_ok(code, "creating select context");
        assert!(select_ctx.is_not_null());

        CssSelectCtx {
            select_ctx: select_ctx,
            sheets: ~[]
        }
    }

    impl CssSelectCtx {
        pub fn append_sheet(&mut self, sheet: CssStylesheet, origin: css_origin, media: uint64_t) {
            let code = unsafe { css_select_ctx_append_sheet(self.select_ctx, sheet.ll_sheet(), origin, media) };
            require_ok(code, "adding sheet to select ctx");

            self.sheets.push(sheet);
        }

        pub fn count_sheets(&self) -> uint {
            let mut count = 0;
            let code = unsafe { css_select_ctx_count_sheets(self.select_ctx, to_mut_unsafe_ptr(&mut count)) };
            require_ok(code, "counting sheets");
            return count as uint;
        }

        pub fn select_style<N: VoidPtrLike, H: CssSelectHandler<N>>(&self, node: &N, media: uint64_t,
                                                            inline_style: Option<&CssStylesheet>,
                                                            handler: &H) -> CssSelectResults {
            do with_untyped_handler(handler) |untyped_handler| {
                let raw_handler = build_raw_handler();
                let mut results: *css_select_results = null();
                let inline_sheet = match inline_style {
                    None => null(),
                    Some(sheet) => sheet.ll_sheet(),
                };
                let code = unsafe { css_select_style(self.select_ctx,
                                                     node.to_void_ptr(),
                                                     media,
                                                     inline_sheet,
                                                     to_unsafe_ptr(&raw_handler),
                                                     transmute(to_unsafe_ptr(untyped_handler)),
                                                     to_mut_unsafe_ptr(&mut results)) };
                require_ok(code, "selecting style");

                CssSelectResults {
                    results: results
                }
            }
        }
    }

    fn build_raw_handler() -> css_select_handler {
        css_select_handler {
            handler_version: CSS_SELECT_HANDLER_VERSION_1,
            node_name: raw_handler::node_name,
            node_classes: raw_handler::node_classes,
            node_id: raw_handler::node_id,
            named_ancestor_node: raw_handler::named_ancestor_node,
            named_parent_node: raw_handler::named_parent_node,
            named_sibling_node: raw_handler::named_sibling_node,
            named_generic_sibling_node: raw_handler::named_generic_sibling_node,
            parent_node: raw_handler::parent_node,
            sibling_node: raw_handler::sibling_node,
            node_has_name: raw_handler::node_has_name,
            node_has_class: raw_handler::node_has_class,
            node_has_id: raw_handler::node_has_id,
            node_has_attribute: raw_handler::node_has_attribute,
            node_has_attribute_equal: raw_handler::node_has_attribute_equal,
            node_has_attribute_dashmatch: raw_handler::node_has_attribute_dashmatch,
            node_has_attribute_includes: raw_handler::node_has_attribute_includes,
            node_has_attribute_prefix: raw_handler::node_has_attribute_prefix,
            node_has_attribute_suffix: raw_handler::node_has_attribute_suffix,
            node_has_attribute_substring: raw_handler::node_has_attribute_substring,
            node_is_root: raw_handler::node_is_root,
            node_count_siblings: raw_handler::node_count_siblings,
            node_is_empty: raw_handler::node_is_empty,
            node_is_link: raw_handler::node_is_link,
            node_is_visited: raw_handler::node_is_visited,
            node_is_hover: raw_handler::node_is_hover,
            node_is_active: raw_handler::node_is_active,
            node_is_focus: raw_handler::node_is_focus,
            node_is_enabled: raw_handler::node_is_enabled,
            node_is_disabled: raw_handler::node_is_disabled,
            node_is_checked: raw_handler::node_is_checked,
            node_is_target: raw_handler::node_is_target,
            node_is_lang: raw_handler::node_is_lang,
            node_presentational_hint: raw_handler::node_presentational_hint,
            ua_default_for_property: raw_handler::ua_default_for_property,
            compute_font_size: raw_handler::compute_font_size
        }
    }

    mod raw_handler {
        use std::libc::types::common::c99::{uint32_t, int32_t};
        use wapcaplet::ll::lwc_string;
        use ll::types::css_qname;
        use std::libc::c_void;
        use std::cast::transmute;
        use ll::errors::{css_error, CSS_OK, CSS_PROPERTY_NOT_SET};
        use ll::hint::css_hint;
        use types;
        use hint;
        use properties;
        use hint::CssHint;
        use super::UntypedHandler;

        fn unimpl(n: &str) -> ! {
            fail!(fmt!("unimplemented css callback handler: %s", n))
        }
        fn unimpl_warn(what: &str) {
            warn!("unimplemented css value: %?", what);
        }
        fn enter(n: &str) {
            debug!("entering raw handler: %s", n);
        }
        fn ph<'a>(pw: *c_void) -> &'a UntypedHandler<'a> {
            unsafe { transmute(pw) }
        }
        pub extern fn node_name(pw: *c_void, node: *c_void, qname: *mut css_qname) -> css_error {
            enter("node_name");
            (ph(pw).node_name)(node, qname)
        }
        pub extern fn node_classes(pw: *c_void, node: *c_void, classes: *mut **lwc_string, n_classes: *mut uint32_t) -> css_error {
            enter("node_classes");
            (ph(pw).node_classes)(node, classes, n_classes)
        }
        pub extern fn node_id(pw: *c_void, node: *c_void, id: *mut *lwc_string) -> css_error {
            enter("node_id");
            (ph(pw).node_id)(node, id)
        }
        pub extern fn named_ancestor_node(pw: *c_void,
                                          node: *c_void,
                                          qname: *css_qname,
                                          parent: *mut *c_void) -> css_error {
            enter("named_ancestor_node");
            (ph(pw).named_ancestor_node)(node, qname, parent)
        }
        pub extern fn named_parent_node(pw: *c_void, node: *c_void, qname: *css_qname, parent: *mut *c_void) -> css_error {
            enter("named_parent_node");
            (ph(pw).named_parent_node)(node, qname, parent)
        }
        pub extern fn named_sibling_node(_pw: *c_void, node: *c_void, _qname: *css_qname, sibling: *mut *c_void) -> css_error {
            unimpl_warn("named_sibling_node");
            unsafe {
                *sibling = node;
                CSS_OK
            }
        }
        pub extern fn named_generic_sibling_node(_pw: *c_void, _node: *c_void, _qname: *css_qname, _sibling: **c_void) -> css_error {
            unimpl("named_generic_sibling_node")
        }
        pub extern fn parent_node(pw: *c_void, node: *c_void, parent: *mut *c_void) -> css_error {
            enter("parent_node");
            (ph(pw).parent_node)(node, parent)
        }
        pub extern fn sibling_node(_pw: *c_void, node: *c_void, sibling: *mut *c_void) -> css_error {
            unimpl_warn("sibling_node");
            unsafe {
                *sibling = node;
                CSS_OK
            }
        }
        pub extern fn node_has_name(_pw: *c_void, _node: *c_void, _qname: *css_qname, _match_: *bool) -> css_error {
            unimpl("node_has_name")
        }
        pub extern fn node_has_class(pw: *c_void, node: *c_void, name: *lwc_string, match_: *mut bool) -> css_error {
            enter("node_has_class");
            (ph(pw).node_has_class)(node, name, match_)
        }
        pub extern fn node_has_id(pw: *c_void, node: *c_void, name: *lwc_string, match_: *mut bool) -> css_error {
            enter("node_has_id");
            (ph(pw).node_has_id)(node, name, match_)
        }
        pub extern fn node_has_attribute(_pw: *c_void, _node: *c_void, _qname: *css_qname, match_: *mut bool) -> css_error {
            unimpl_warn("node_has_attribute");
            unsafe {
                *match_ = false;
                CSS_OK
            }
        }
        pub extern fn node_has_attribute_equal(_pw: *c_void, _node: *c_void, _qname: *css_qname, _value: *lwc_string, match_: *mut bool) -> css_error {
            unimpl_warn("node_has_attribute_equal");
            unsafe {
                *match_ = false;
                CSS_OK
            }
        }
        pub extern fn node_has_attribute_dashmatch(_pw: *c_void, _node: *c_void, _qname: *css_qname, _value: *lwc_string, _match_: *bool) -> css_error {
            unimpl("node_has_attribute_dashmatch")
        }
        pub extern fn node_has_attribute_includes(_pw: *c_void, _node: *c_void, _qname: *css_qname, _value: *lwc_string, match_: *mut bool) -> css_error {
            unimpl_warn("node_has_attribute_includes");
            unsafe {
                *match_ = false;
                CSS_OK
            }
        }
        pub extern fn node_has_attribute_prefix(_pw: *c_void, _node: *c_void, _qname: *css_qname, _value: *lwc_string, match_: *mut bool) -> css_error {
            unimpl_warn("node_has_attribute_prefix");
            unsafe {
                *match_ = false;
                CSS_OK
            }
        }
        pub extern fn node_has_attribute_suffix(_pw: *c_void, _node: *c_void, _qname: *css_qname, _value: *lwc_string, match_: *mut bool) -> css_error {
            unimpl_warn("node_has_attribute_suffix");
            unsafe {
                *match_ = false;
                CSS_OK
            }
        }
        pub extern fn node_has_attribute_substring(_pw: *c_void, _node: *c_void, _qname: *css_qname, _value: *lwc_string, match_: *mut bool) -> css_error {
            unimpl_warn("node_has_attribute_substring");
            unsafe {
                *match_ = false;
                CSS_OK
            }
        }
        pub extern fn node_is_root(pw: *c_void, node: *c_void, match_: *mut bool) -> css_error {
            enter("node_is_root");
            (ph(pw).node_is_root)(node, match_)
        }
        pub extern fn node_count_siblings(_pw: *c_void, _node: *c_void, _same_name: bool, _after: bool, count: *mut int32_t) -> css_error {
            unimpl_warn("node_count_siblings");
            unsafe {
                *count = 0;
                CSS_OK
            }
        }
        pub extern fn node_is_empty(_pw: *c_void, _node: *c_void, match_: *mut bool) -> css_error {
            unimpl_warn("node_is_empty");
            unsafe {
                *match_ = true;
                CSS_OK
            }
        }
        pub extern fn node_is_link(pw: *c_void, node: *c_void, match_: *mut bool) -> css_error {
            enter("node_is_link");
            (ph(pw).node_is_link)(node, match_)
        }
        pub extern fn node_is_visited(pw: *c_void, node: *c_void, match_: *mut bool) -> css_error {
            enter("node_is_visited");
            (ph(pw).node_is_visited)(node, match_)
        }
        pub extern fn node_is_hover(_pw: *c_void, _node: *c_void, _match_: *bool) -> css_error {
            unimpl_warn("node_is_hover");
            CSS_OK
        }
        pub extern fn node_is_active(_pw: *c_void, _node: *c_void, match_: *mut bool) -> css_error {
            unimpl_warn("node_is_active");
            unsafe {
                *match_ = false;
                CSS_OK
            }
        }
        pub extern fn node_is_focus(_pw: *c_void, _node: *c_void, match_: *mut bool) -> css_error {
            unimpl_warn("node_is_focus");
            unsafe {
                *match_ = false;
                CSS_OK
            }
        }
        pub extern fn node_is_enabled(_pw: *c_void, _node: *c_void, _match_: *bool) -> css_error {
            unimpl("node_is_enabled")
        }
        pub extern fn node_is_disabled(_pw: *c_void, _node: *c_void, _match_: *bool) -> css_error {
            unimpl("node_is_disabled")
        }
        pub extern fn node_is_checked(_pw: *c_void, _node: *c_void, _match_: *bool) -> css_error {
            unimpl("node_is_checked")
        }
        pub extern fn node_is_target(_pw: *c_void, _node: *c_void, match_: *mut bool) -> css_error {
            unimpl_warn("node_is_target");
            unsafe {
                *match_ = false;
                CSS_OK
            }
        }
        pub extern fn node_is_lang(_pw: *c_void, _node: *c_void, _lang: *lwc_string, match_: *mut bool) -> css_error {
            unimpl_warn("node_is_lang");
            unsafe {
                *match_ = false;
                CSS_OK
            }
        }
        pub extern fn node_presentational_hint(_pw: *c_void, _node: *c_void, _property: uint32_t, _hint: *css_hint) -> css_error {
            enter("node_presentational_hint");
            CSS_PROPERTY_NOT_SET
        }
        pub extern fn ua_default_for_property(pw: *c_void, property: uint32_t, hint: *mut css_hint) -> css_error {
            enter("ua_default_for_property");
            (ph(pw).ua_default_for_property)(property, hint)
        }
        pub extern fn compute_font_size(_pw: *c_void, parent: *css_hint, size: *mut css_hint) -> css_error {
            enter("compute_font_size");
            // FIXME: This should be merged with the one in rust-css, I think. --pcwalton
            let parent_hint;
            if parent.is_null() {
                parent_hint = hint::CssHintLength(types::CssUnitPx(16 * 1024));
            } else {
                parent_hint = CssHint::new(properties::CssPropFontSize, parent);
            }
            parent_hint.write_to_ll(properties::CssPropFontSize, size);
            CSS_OK
        }
    }

    pub struct UntypedHandler<'self> {
        node_name: &'self fn(node: *c_void, qname: *mut css_qname) -> css_error,
        node_classes: &'self fn(node: *c_void, classes: *mut **lwc_string, n_classes: *mut uint32_t) -> css_error,
        node_id: &'self fn(node: *c_void, id: *mut *lwc_string) -> css_error,
        named_parent_node: &'self fn(node: *c_void, qname: *css_qname, parent: *mut *c_void) -> css_error,
        parent_node: &'self fn(node: *c_void, parent: *mut *c_void) -> css_error,
        node_has_class: &'self fn(node: *c_void, name: *lwc_string, match_: *mut bool) -> css_error,
        node_has_id: &'self fn(node: *c_void, name: *lwc_string, match_: *mut bool) -> css_error,
        named_ancestor_node: &'self fn(node: *c_void,
                                 qname: *css_qname,
                                 parent: *mut *c_void) -> css_error,
        node_is_root: &'self fn(node: *c_void, match_: *mut bool) -> css_error,
        node_is_link: &'self fn(node: *c_void, match_: *mut bool) -> css_error,
        node_is_visited: &'self fn(node: *c_void, match_: *mut bool) -> css_error,
        ua_default_for_property: &'self fn(property: uint32_t, hint: *mut css_hint) -> css_error,
    }

    fn with_untyped_handler<N: VoidPtrLike, H: CssSelectHandler<N>, R>(handler: &H, f: &fn(&UntypedHandler) -> R) -> R {
        unsafe {
            let untyped_handler = UntypedHandler {
                node_name: |node: *c_void, qname: *mut css_qname| -> css_error {
                    let hlnode: N = VoidPtrLike::from_void_ptr(node);
                    let mut hlqname = handler.node_name(&hlnode);
                    write_ll_qname(&mut hlqname, qname);
                    CSS_OK
                },
                node_classes: |node: *c_void, classes: *mut **lwc_string, n_classes: *mut uint32_t| -> css_error {
                    let hlnode: N = VoidPtrLike::from_void_ptr(node);
                    
                    let (a, b) = match handler.node_classes(&hlnode) {
                        Some(classes) => {
                            let class = classes.map(|e| e.raw_reffed());
                            let len = classes.len();
                            let size = (len * sys::size_of::<libc::intptr_t>());
                            let mem = realloc(ptr::mut_null(), size as libc::size_t, null()) as *mut u8;
                            ptr::copy_memory(mem, vec::raw::to_ptr(class) as *u8, size);
                            (mem as **lwc_string, len as u32)
                        },
                        None => (null(), 0)
                    };
                    *classes = a;
                    *n_classes = b;
                    CSS_OK
                },
                node_id: |node: *c_void, id: *mut *lwc_string| -> css_error {
                    let hlnode: N = VoidPtrLike::from_void_ptr(node);
                    *id = match handler.node_id(&hlnode) {
                        Some(id) => id.raw_reffed(),
                        None => null()
                    };
                    CSS_OK
                },
                named_parent_node: |node: *c_void, qname: *css_qname, parent: *mut *c_void| -> css_error {
                    let hlnode: N = VoidPtrLike::from_void_ptr(node);
                    let hlqname = ll_qname_to_hl_qname(qname);
                    *parent = match handler.named_parent_node(&hlnode, &hlqname) {
                        Some(p) => p.to_void_ptr(),
                        None => null()
                    };
                    CSS_OK
                },
                parent_node: |node: *c_void, parent: *mut *c_void| -> css_error {
                    let hlnode: N = VoidPtrLike::from_void_ptr(node);
                    let hlparent: Option<N> = handler.parent_node(&hlnode);
                    *parent = match hlparent {
                        Some(ref p) => p.to_void_ptr(),
                        None => null()
                    };
                    CSS_OK
                },
                node_has_class: |node: *c_void, name: *lwc_string, match_: *mut bool| -> css_error {
                    let hlnode: N = VoidPtrLike::from_void_ptr(node);
                    let hlname = from_lwc_string(name);
                    *match_ = handler.node_has_class(&hlnode, hlname);
                    CSS_OK
                },
                node_has_id: |node: *c_void, name: *lwc_string, match_: *mut bool| -> css_error {
                    let hlnode: N = VoidPtrLike::from_void_ptr(node);
                    let hlname = from_lwc_string(name);
                    *match_ = handler.node_has_id(&hlnode, hlname);
                    CSS_OK
                },
                named_ancestor_node: |node: *c_void,
                                      qname: *css_qname,
                                      parent: *mut *c_void| -> css_error {
                    let hlnode: N = VoidPtrLike::from_void_ptr(node);
                    let hlqname = ll_qname_to_hl_qname(qname);
                    *parent = match handler.named_ancestor_node(&hlnode, &hlqname) {
                        Some(p) => p.to_void_ptr(),
                        None => null()
                    };
                    CSS_OK
                },
                node_is_root: |node: *c_void, match_: *mut bool| -> css_error {
                    let hlnode = VoidPtrLike::from_void_ptr(node);
                    *match_ = handler.node_is_root(&hlnode);
                    CSS_OK
                },
                node_is_link: |node: *c_void, match_: *mut bool| -> css_error {
                    let hlnode = VoidPtrLike::from_void_ptr(node);
                    *match_ = handler.node_is_link(&hlnode);
                    CSS_OK
                },
                node_is_visited: |node: *c_void, match_: *mut bool| -> css_error {
                    let hlnode = VoidPtrLike::from_void_ptr(node);
                    *match_ = handler.node_is_visited(&hlnode);
                    CSS_OK
                },

                ua_default_for_property: |property: uint32_t, hint: *mut css_hint| -> css_error {
                    use properties::property_from_uint;
                    let hlproperty = property_from_uint(property);
                    let hlhint = handler.ua_default_for_property(hlproperty);
                    hlhint.write_to_ll(hlproperty, hint)
                },
            };

            f(&untyped_handler)
        }
    }

    pub trait CssSelectHandler<N> {
        fn node_name(&self, node: &N) -> CssQName;
        fn node_classes(&self, node: &N) -> Option<~[LwcString]>;
        fn node_id(&self, node: &N) -> Option<LwcString>;
        fn named_parent_node(&self, node: &N, qname: &CssQName) -> Option<N>;
        fn parent_node(&self, node: &N) -> Option<N>;
        fn node_has_class(&self, node: &N, name: LwcString) -> bool;
        fn node_has_id(&self, node: &N, name: LwcString) -> bool;
        fn named_ancestor_node(&self, node: &N, qname: &CssQName) -> Option<N>;
        fn node_is_root(&self, node: &N) -> bool;
        fn node_is_link(&self, node: &N) -> bool;
        fn node_is_visited(&self, node: &N) -> bool;
        fn ua_default_for_property(&self, property: CssProperty) -> CssHint;
    }

    pub struct CssSelectResults {
        priv results: *css_select_results,
    }

    impl Drop for CssSelectResults {
        fn drop(&self) {
            assert!(self.results.is_not_null());
            let code = unsafe { css_select_results_destroy(self.results) };
            require_ok(code, "destroying select results");
        }
    }

    impl<'self> CssSelectResults {
        pub fn computed_style(&'self self, element: CssPseudoElement) -> CssComputedStyle<'self> {
            let element = element.to_ll();
            let llstyle = unsafe { *self.results }.styles[element];
            // FIXME: Rust #3926
            assert!((llstyle as *c_void).is_not_null());

            CssComputedStyle {
                result_backref: self,
                computed_style: llstyle
            }
        }
    }

}

pub mod computed {
    use properties::CssPropFontSize;
    use hint::CssHint;
    use select::CssSelectResults;
    use values::{CssColorValue, CssMarginValue, CssPaddingValue, CssBorderStyleValue, CssBorderWidthValue, CssDisplayValue};
    use values::{CssFloatValue, CssClearValue, CssPositionValue, CssWidthValue, CssHeightValue, CssFontFamilyValue};
    use values::{CssFontSizeValue, CssFontStyleValue, CssFontWeightValue, CssTextAlignValue, CssTextDecorationValue};
    use values::{CssLineHeightValue, CssVerticalAlignValue};
    use ll::properties::*;
    use ll::computed::*;
    use std::ptr::{to_mut_unsafe_ptr, null};
    use std::cast::transmute;
    use std::libc::c_void;
    use ll::errors::{css_error, CSS_OK};
    use ll::hint::css_hint;
    use wapcaplet::ll::lwc_string;

    pub struct CssComputedStyle<'self> {
        // A borrowed back reference to ensure this outlives the results
        result_backref: &'self CssSelectResults,
        computed_style: *css_computed_style,
    }

    impl<'self> CssComputedStyle<'self> {
        pub fn color(&self) -> CssColorValue {
            let mut color = 0;
            let type_ = unsafe {css_computed_color(self.computed_style, to_mut_unsafe_ptr(&mut color)) };
            let type_ = type_ as css_color_e;

            CssColorValue::new(type_, color)
        }

        pub fn background_color(&self) -> CssColorValue {
            let mut color = 0;
            let type_ = unsafe { css_computed_background_color(self.computed_style, to_mut_unsafe_ptr(&mut color)) };
            let type_ = type_ as css_color_e;

            CssColorValue::new(type_, color)
        }

        pub fn border_top_style(&self) -> CssBorderStyleValue {
            let mut length = 0;
            let type_ = unsafe { css_computed_border_top_style(self.computed_style) };
            let type_ = type_ as css_border_style_e;

            CssBorderStyleValue::new(type_)
        }

        pub fn border_right_style(&self) -> CssBorderStyleValue {
            let mut length = 0;
            let type_ = unsafe { css_computed_border_right_style(self.computed_style) };
            let type_ = type_ as css_border_style_e;

            CssBorderStyleValue::new(type_)
        }

       pub fn border_bottom_style(&self) -> CssBorderStyleValue {
            let mut length = 0;
            let type_ = unsafe { css_computed_border_bottom_style(self.computed_style) };
            let type_ = type_ as css_border_style_e;

            CssBorderStyleValue::new(type_)
        }

        pub fn border_left_style(&self) -> CssBorderStyleValue {
            let mut length = 0;
            let type_ = unsafe { css_computed_border_left_style(self.computed_style) };
            let type_ = type_ as css_border_style_e;

            CssBorderStyleValue::new(type_)
        }

        pub fn border_top_width(&self) -> CssBorderWidthValue {
            let mut length = 0;
            let mut unit = 0;
            let type_ = unsafe { css_computed_border_top_width(self.computed_style,
                                                               to_mut_unsafe_ptr(&mut length),
                                                               to_mut_unsafe_ptr(&mut unit)) };
            let type_ = type_ as css_border_width_e;

            CssBorderWidthValue::new(type_, length, unit)
        }

        pub fn border_right_width(&self) -> CssBorderWidthValue {
            let mut length = 0;
            let mut unit = 0;
            let type_ = unsafe { css_computed_border_right_width(self.computed_style,
                                                                 to_mut_unsafe_ptr(&mut length),
                                                                 to_mut_unsafe_ptr(&mut unit)) };
            let type_ = type_ as css_border_width_e;

            CssBorderWidthValue::new(type_, length, unit)
        }

        pub fn border_bottom_width(&self) -> CssBorderWidthValue {
            let mut length = 0;
            let mut unit = 0;
            let type_ = unsafe {css_computed_border_bottom_width(self.computed_style,
                                                                 to_mut_unsafe_ptr(&mut length),
                                                                 to_mut_unsafe_ptr(&mut unit)) };
            let type_ = type_ as css_border_width_e;

            CssBorderWidthValue::new(type_, length, unit)
        }

        pub fn border_left_width(&self) -> CssBorderWidthValue {
            let mut length = 0;
            let mut unit = 0;
            let type_ = unsafe { css_computed_border_left_width(self.computed_style,
                                                                to_mut_unsafe_ptr(&mut length),
                                                                to_mut_unsafe_ptr(&mut unit)) };
            let type_ = type_ as css_border_width_e;

            CssBorderWidthValue::new(type_, length, unit)
        }

        pub fn border_top_color(&self) -> CssColorValue {
            let mut color = 0;
            let type_ = unsafe { css_computed_border_top_color(self.computed_style,
                                                               to_mut_unsafe_ptr(&mut color)) };
            let type_ = type_ as css_color_e;
            CssColorValue::new(type_, color)
        }

        pub fn border_right_color(&self) -> CssColorValue {
            let mut color = 0;
            let type_ = unsafe { css_computed_border_right_color(self.computed_style,
                                                                 to_mut_unsafe_ptr(&mut color)) };
            let type_ = type_ as css_color_e;
            CssColorValue::new(type_, color)
        }

        pub fn border_bottom_color(&self) -> CssColorValue {
            let mut color = 0;
            let type_ = unsafe { css_computed_border_bottom_color(self.computed_style,
                                                                  to_mut_unsafe_ptr(&mut color)) };
            let type_ = type_ as css_color_e;
            CssColorValue::new(type_, color)
        }

        pub fn border_left_color(&self) -> CssColorValue {
            let mut color = 0;
            let type_ = unsafe { css_computed_border_left_color(self.computed_style,
                                                                to_mut_unsafe_ptr(&mut color)) };
            let type_ = type_ as css_color_e;
            CssColorValue::new(type_, color)
        }

        pub fn margin_top(&self) -> CssMarginValue {
            let mut length = 0;
            let mut unit = 0;
            let type_ = unsafe { css_computed_margin_top(self.computed_style,
                                                         to_mut_unsafe_ptr(&mut length),
                                                         to_mut_unsafe_ptr(&mut unit)) };
            let type_ = type_ as css_margin_e;

            CssMarginValue::new(type_, length, unit)
        }

        pub fn margin_right(&self) -> CssMarginValue {
            let mut length = 0;
            let mut unit = 0;
            let type_ = unsafe {css_computed_margin_right(self.computed_style,
                                                          to_mut_unsafe_ptr(&mut length),
                                                          to_mut_unsafe_ptr(&mut unit)) };
            let type_ = type_ as css_margin_e;

            CssMarginValue::new(type_, length, unit)
        }

        pub fn margin_bottom(&self) -> CssMarginValue {
            let mut length = 0;
            let mut unit = 0;
            let type_ = unsafe { css_computed_margin_bottom(self.computed_style,
                                                            to_mut_unsafe_ptr(&mut length),
                                                            to_mut_unsafe_ptr(&mut unit)) };
            let type_ = type_ as css_margin_e;

            CssMarginValue::new(type_, length, unit)
        }

        pub fn margin_left(&self) -> CssMarginValue {
            let mut length = 0;
            let mut unit = 0;
            let type_ = unsafe { css_computed_margin_left(self.computed_style,
                                                          to_mut_unsafe_ptr(&mut length),
                                                          to_mut_unsafe_ptr(&mut unit)) };
            let type_ = type_ as css_margin_e;

            CssMarginValue::new(type_, length, unit)
        }

        pub fn padding_top(&self) -> CssPaddingValue {
            let mut length = 0;
            let mut unit = 0;
            let type_ = unsafe { css_computed_padding_top(self.computed_style,
                                                         to_mut_unsafe_ptr(&mut length),
                                                         to_mut_unsafe_ptr(&mut unit)) };
            let type_ = type_ as css_padding_e;

            CssPaddingValue::new(type_, length, unit)
        }

        pub fn padding_right(&self) -> CssPaddingValue {
            let mut length = 0;
            let mut unit = 0;
            let type_ = unsafe {css_computed_padding_right(self.computed_style,
                                                          to_mut_unsafe_ptr(&mut length),
                                                          to_mut_unsafe_ptr(&mut unit)) };
            let type_ = type_ as css_padding_e;

            CssPaddingValue::new(type_, length, unit)
        }

        pub fn padding_bottom(&self) -> CssPaddingValue {
            let mut length = 0;
            let mut unit = 0;
            let type_ = unsafe { css_computed_padding_bottom(self.computed_style,
                                                            to_mut_unsafe_ptr(&mut length),
                                                            to_mut_unsafe_ptr(&mut unit)) };
            let type_ = type_ as css_padding_e;

            CssPaddingValue::new(type_, length, unit)
        }

        pub fn padding_left(&self) -> CssPaddingValue {
            let mut length = 0;
            let mut unit = 0;
            let type_ = unsafe { css_computed_padding_left(self.computed_style,
                                                          to_mut_unsafe_ptr(&mut length),
                                                          to_mut_unsafe_ptr(&mut unit)) };
            let type_ = type_ as css_padding_e;

            CssPaddingValue::new(type_, length, unit)
        }

        pub fn display(&self, root: bool) -> CssDisplayValue {
            let type_ = unsafe { css_computed_display(self.computed_style, root) };
            let type_ = type_ as css_display_e;

            CssDisplayValue::new(type_)
        }

        pub fn position(&self) -> CssPositionValue {
            let type_ = unsafe { css_computed_position(self.computed_style) };
            let type_ = type_ as css_position_e;

            CssPositionValue::new(type_)
        }

        pub fn width(&self) -> CssWidthValue {
            let mut length = 0;
            let mut unit = 0;
            let type_ = unsafe { css_computed_width(self.computed_style,
                                                    to_mut_unsafe_ptr(&mut length),
                                                    to_mut_unsafe_ptr(&mut unit)) };
            let type_ = type_ as css_width_e;

            CssWidthValue::new(type_, length, unit)
        }

        pub fn height(&self) -> CssHeightValue {
            let mut length = 0;
            let mut unit = 0;
            let type_ = unsafe { css_computed_height(self.computed_style,
                                                     to_mut_unsafe_ptr(&mut length),
                                                     to_mut_unsafe_ptr(&mut unit)) };
            let type_ = type_ as css_height_e;

            CssHeightValue::new(type_, length, unit)
        }

        pub fn float(&self) -> CssFloatValue {
            let type_ = unsafe { css_computed_float(self.computed_style) };
            let type_ = type_ as css_float_e;

            CssFloatValue::new(type_)
        }

        pub fn clear(&self) -> CssClearValue {
            let type_ = unsafe { css_computed_clear(self.computed_style) };
            let type_ = type_ as css_clear_e;

            CssClearValue::new(type_)
        }

        pub fn font_family(&self) -> CssFontFamilyValue {
            let mut names: **lwc_string = null();
            let type_ = unsafe { css_computed_font_family(self.computed_style,
                                                          to_mut_unsafe_ptr(&mut names)) };
            let type_ = type_ as css_font_family_e;

            CssFontFamilyValue::new(type_, names)
        }

        pub fn font_size(&self) -> CssFontSizeValue {
            let mut length = 0;
            let mut unit = 0;
            let type_ = unsafe { css_computed_font_size(self.computed_style,
                                                        to_mut_unsafe_ptr(&mut length),
                                                        to_mut_unsafe_ptr(&mut unit)) };
            let type_ = type_ as css_font_size_e;

            CssFontSizeValue::new(type_, length, unit)
        }

        pub fn font_style(&self) -> CssFontStyleValue {
            let type_ = unsafe { css_computed_font_style(self.computed_style) };
            let type_ = type_ as css_font_style_e;

            CssFontStyleValue::new(type_)
        }

        pub fn font_weight(&self) -> CssFontWeightValue {
            let type_ = unsafe { css_computed_font_weight(self.computed_style) };
            let type_ = type_ as css_font_weight_e;

            CssFontWeightValue::new(type_)
        }

        pub fn text_align(&self) -> CssTextAlignValue {
            let type_ = unsafe { css_computed_text_align(self.computed_style) };
            let type_ = type_ as css_text_align_e;

            CssTextAlignValue::new(type_)
        }

        pub fn text_decoration(&self) -> CssTextDecorationValue {
            let type_ = unsafe { css_computed_text_decoration(self.computed_style) };
            let type_ = type_ as css_text_decoration_e;
            debug!("Getting text-decoration raw: %?", type_);

            CssTextDecorationValue::new(type_)
        }


        pub fn line_height(&self) -> CssLineHeightValue {
            let mut length = 0;
            let mut unit = 0;
            let type_ = unsafe { css_computed_line_height(self.computed_style,
                                                          to_mut_unsafe_ptr(&mut length),
                                                          to_mut_unsafe_ptr(&mut unit)) };
            let type_ = type_ as css_line_height_e;

            CssLineHeightValue::new(type_, length, unit)
        }

        pub fn vertical_align(&self) -> CssVerticalAlignValue {
            let mut length = 0;
            let mut unit = 0;
            let type_ = unsafe { css_computed_vertical_align(self.computed_style,
                                                          to_mut_unsafe_ptr(&mut length),
                                                          to_mut_unsafe_ptr(&mut unit)) };
            let type_ = type_ as css_vertical_align_e;

            CssVerticalAlignValue::new(type_, length, unit)
        }
    }

    pub type ComputeFontSizeCb = @fn(parent: &Option<CssHint>, child: &CssHint) -> CssHint;

    // Merge parent and child styles into another style. The result
    // pointer may point to the child style, in which case the child
    // style is overwritten
    pub fn compose(parent: &CssComputedStyle, child: &mut CssComputedStyle,
                   compute_font_size: ComputeFontSizeCb,
                   result: &mut CssComputedStyle) {
        let llparent = parent.computed_style;
        let llchild = child.computed_style;
        let pw = unsafe { transmute(&compute_font_size) };
        let llresult = result.computed_style as *mut css_computed_style;
        let err = unsafe { css_computed_style_compose(llparent, llchild, compute_font_size_cb, pw, llresult) };
        if err != CSS_OK {
            fail!(~"stylesheet composition failed")
        }
    }

    extern fn compute_font_size_cb(pw: *c_void, parent: *css_hint, size: *mut css_hint) -> css_error {
        let hlcbptr: *ComputeFontSizeCb = unsafe { transmute(pw) };
        let hlparent = if parent.is_null() {
            None
        } else {
            Some(CssHint::new(CssPropFontSize, parent))
        };
        let hlchild = CssHint::new(CssPropFontSize, unsafe { transmute(size) });
        let new_hint = unsafe { *hlcbptr }(&hlparent, &hlchild);
        new_hint.write_to_ll(CssPropFontSize, size);

        CSS_OK
    }
}

// Types returned as calculated styles. Maps to properties
mod values {
    use types::{CssColor, CssUnit};
    use conversions::{ll_color_to_hl_color, ll_unit_to_hl_unit};
    use ll::properties::*;
    use ll::types::{css_color, css_unit};
    use ll::stylesheet::css_fixed;
    use conversions::{c_enum_to_rust_enum, lwc_string_buf_to_hl_vec};
    use wapcaplet::LwcString;
    use wapcaplet::ll::lwc_string;

    // Like css_color_e
    pub enum CssColorValue {
        CssColorInherit,
        CssColorColor(CssColor)
    }

    impl CssColorValue {
        pub fn new(type_: css_color_e, color: css_color) -> CssColorValue {
            if type_ == CSS_COLOR_INHERIT {
                CssColorInherit
            } else if type_ == CSS_COLOR_COLOR {
                CssColorColor(ll_color_to_hl_color(color))
            } else {
                unimpl("color")
            }
        }
    }

    pub enum CssMarginValue {
        CssMarginInherit,
        CssMarginSet(CssUnit),
        CssMarginAuto
    }

    impl CssMarginValue {
        pub fn new(type_: css_margin_e, length: css_fixed, unit: css_unit) -> CssMarginValue {
            if type_ == CSS_MARGIN_INHERIT {
                CssMarginInherit
            } else if type_ == CSS_MARGIN_SET {
                CssMarginSet(ll_unit_to_hl_unit(unit, length))
            } else if type_ == CSS_MARGIN_AUTO {
                CssMarginAuto
            } else {
                unimpl("margin")
            }
        }
    }


    pub enum CssPaddingValue {
        CssPaddingInherit,
        CssPaddingSet(CssUnit)
    }

    impl CssPaddingValue {
        pub fn new(type_: css_padding_e, length: css_fixed, unit: css_unit) -> CssPaddingValue {
            if type_ == CSS_PADDING_INHERIT {
                CssPaddingInherit
            } else if type_ == CSS_PADDING_SET {
                CssPaddingSet(ll_unit_to_hl_unit(unit, length))
            } else {
                unimpl("padding")
            }
        }
    }

    pub enum CssBorderStyleValue {
        CssBorderStyleInherit,
        CssBorderStyleNone,
        CssBorderStyleHidden,
        CssBorderStyleDotted,
        CssBorderStyleDashed,
        CssBorderStyleSolid,
        CssBorderStyleDouble,
        CssBorderStyleGroove,
        CssBorderStyleRidge,
        CssBorderStyleInset,
        CssBorderStyleOutset
    }

    impl CssBorderStyleValue {
        pub fn new(type_: css_border_style_e) -> CssBorderStyleValue {
            match type_ {
                CSS_BORDER_STYLE_INHERIT => CssBorderStyleInherit,
                CSS_BORDER_STYLE_NONE => CssBorderStyleNone,
                CSS_BORDER_STYLE_HIDDEN => CssBorderStyleHidden,
                CSS_BORDER_STYLE_DOTTED => CssBorderStyleDotted,
                CSS_BORDER_STYLE_DASHED => CssBorderStyleDashed,
                CSS_BORDER_STYLE_SOLID => CssBorderStyleSolid,
                CSS_BORDER_STYLE_DOUBLE => CssBorderStyleDouble,
                CSS_BORDER_STYLE_GROOVE => CssBorderStyleGroove,
                CSS_BORDER_STYLE_RIDGE => CssBorderStyleRidge,
                CSS_BORDER_STYLE_INSET => CssBorderStyleInset,
                CSS_BORDER_STYLE_OUTSET => CssBorderStyleOutset,
                _ => unimpl("border style")
            }
        }
    }

    pub enum CssBorderWidthValue {
        CssBorderWidthInherit,
        CssBorderWidthThin,
        CssBorderWidthMedium,
        CssBorderWidthThick,
        CssBorderWidthWidth(CssUnit)
    }

    impl CssBorderWidthValue {
        pub fn new(type_: css_border_width_e, length: css_fixed, unit: css_unit) -> CssBorderWidthValue {
            if type_ == CSS_BORDER_WIDTH_INHERIT {
                CssBorderWidthInherit
            } else if type_ == CSS_BORDER_WIDTH_THIN {
                CssBorderWidthThin
            } else if type_ == CSS_BORDER_WIDTH_MEDIUM {
                CssBorderWidthMedium
            } else if type_ == CSS_BORDER_WIDTH_THICK {
                CssBorderWidthThick
            } else if type_ == CSS_BORDER_WIDTH_WIDTH {
                CssBorderWidthWidth(ll_unit_to_hl_unit(unit, length))
            } else {
                unimpl("border_width")
            }
        }
    }

    pub enum CssDisplayValue {
        CssDisplayInherit = 0x00,
        CssDisplayInline = 0x01,
        CssDisplayBlock = 0x02,
        CssDisplayListItem = 0x03,
        CssDisplayRunIn = 0x04,
        CssDisplayInlineBlock = 0x05,
        CssDisplayTable = 0x06,
        CssDisplayInlineTable = 0x07,
        CssDisplayTableRowGroup = 0x08,
        CssDisplayTableHeaderGroup = 0x09,
        CssDisplayTableFooterGroup = 0x0a,
        CssDisplayTableRow = 0x0b,
        CssDisplayTableColumnGroup = 0x0c,
        CssDisplayTableColumn = 0x0d,
        CssDisplayTableCell = 0x0e,
        CssDisplayTableCaption = 0x0f,
        CssDisplayNone = 0x10,
    }

    impl CssDisplayValue {
        pub fn new(type_: css_display_e) -> CssDisplayValue {
            c_enum_to_rust_enum(type_)
        }
    }

    pub enum CssPositionValue {
        CssPositionInherit = 0x0,
        CssPositionStatic = 0x1,
        CssPositionRelative = 0x2,
        CssPositionAbsolute = 0x3,
        CssPositionFixed = 0x4
    }

    impl CssPositionValue {
        pub fn new(type_: css_position_e) -> CssPositionValue {
            c_enum_to_rust_enum(type_)
        }
    }

    pub enum CssWidthValue {
        CssWidthInherit,
        CssWidthSet(CssUnit),
        CssWidthAuto
    }

    impl CssWidthValue {
        pub fn new(type_: css_width_e, length: css_fixed, unit: css_unit) -> CssWidthValue {
            if type_ == CSS_WIDTH_INHERIT {
                CssWidthInherit
            } else if type_ == CSS_WIDTH_SET {
                CssWidthSet(ll_unit_to_hl_unit(unit, length))
            } else if type_ == CSS_WIDTH_AUTO {
                CssWidthAuto
            } else {
                unimpl("width")
            }
        }
    }

    pub enum CssHeightValue {
        CssHeightInherit,
        CssHeightSet(CssUnit),
        CssHeightAuto
    }

    impl CssHeightValue {
        pub fn new(type_: css_height_e, length: css_fixed, unit: css_unit) -> CssHeightValue {
            if type_ == CSS_HEIGHT_INHERIT {
                CssHeightInherit
            } else if type_ == CSS_HEIGHT_SET {
                CssHeightSet(ll_unit_to_hl_unit(unit, length))
            } else if type_ == CSS_HEIGHT_AUTO {
                CssHeightAuto
            } else {
                unimpl("width")
            }
        }
    }

    pub enum CssFloatValue {
        CssFloatInherit = 0x0,
        CssFloatLeft = 0x1,
        CssFloatRight = 0x2,
        CssFloatNone = 0x3
    }

    impl CssFloatValue {
        pub fn new(type_: css_float_e) -> CssFloatValue {
            c_enum_to_rust_enum(type_)
        }
    }

    pub enum CssClearValue {
        CssClearInherit = 0x0,
        CssClearNone = 0x1,
        CssClearLeft = 0x2,
        CssClearRight = 0x3,
        CssClearBoth = 0x4
    }

    impl CssClearValue {
        pub fn new(type_: css_clear_e) -> CssClearValue {
            c_enum_to_rust_enum(type_)
        }
    }

    pub enum CssFontFamilyValue {
        CssFontFamilyInherit,
        CssFontFamilySerif,
        CssFontFamilySansSerif,
        CssFontFamilyCursive,
        CssFontFamilyFantasy,
        CssFontFamilyMonospace,
        CssFontFamilyValue(~[LwcString])
    }

    impl CssFontFamilyValue {
        pub fn new(type_: css_font_family_e, names: **lwc_string) -> CssFontFamilyValue {
            if names.is_not_null() {
                CssFontFamilyValue(lwc_string_buf_to_hl_vec(names))
            } else if type_ == CSS_FONT_FAMILY_INHERIT {
                CssFontFamilyInherit
            } else if type_ == CSS_FONT_FAMILY_SERIF {
                CssFontFamilySerif
            } else if type_ == CSS_FONT_FAMILY_SANS_SERIF {
                CssFontFamilySansSerif
            } else if type_ == CSS_FONT_FAMILY_CURSIVE {
                CssFontFamilyCursive
            } else if type_ == CSS_FONT_FAMILY_FANTASY {
                CssFontFamilyFantasy
            } else if type_ == CSS_FONT_FAMILY_MONOSPACE {
                CssFontFamilyMonospace
            } else {
                fail!()
            }
        }
    }

    pub enum CssFontSizeValue {
        CssFontSizeInherit,
        CssFontSizeXXSmall,
        CssFontSizeXSmall,
        CssFontSizeSmall,
        CssFontSizeMedium,
        CssFontSizeLarge,
        CssFontSizeXLarge,
        CssFontSizeXXLarge,
        CssFontSizeLarger,
        CssFontSizeSmaller,
        CssFontSizeDimension(CssUnit)
    }

    impl CssFontSizeValue {
        pub fn new(type_: css_font_size_e, length: css_fixed, unit: css_unit) -> CssFontSizeValue {
            match type_ {
                x if x == CSS_FONT_SIZE_INHERIT => CssFontSizeInherit,
                x if x == CSS_FONT_SIZE_XX_SMALL => CssFontSizeXXSmall,
                x if x == CSS_FONT_SIZE_X_SMALL => CssFontSizeXSmall,
                x if x == CSS_FONT_SIZE_SMALL => CssFontSizeSmall,
                x if x == CSS_FONT_SIZE_MEDIUM => CssFontSizeMedium,
                x if x == CSS_FONT_SIZE_LARGE => CssFontSizeLarge,
                x if x == CSS_FONT_SIZE_X_LARGE => CssFontSizeXLarge,
                x if x == CSS_FONT_SIZE_XX_LARGE => CssFontSizeXXLarge,
                x if x == CSS_FONT_SIZE_LARGER => CssFontSizeLarger,
                x if x == CSS_FONT_SIZE_SMALLER => CssFontSizeSmaller,
                x if x == CSS_FONT_SIZE_DIMENSION => CssFontSizeDimension(ll_unit_to_hl_unit(unit, length)),
                _ => fail!()
            }
        }
    }

    pub enum CssFontStyleValue {
        CssFontStyleInherit = 0x0,
        CssFontStyleNormal = 0x1,
        CssFontStyleItalic = 0x2,
        CssFontStyleOblique = 0x3
    }

    impl CssFontStyleValue {
        pub fn new(type_: css_font_style_e) -> CssFontStyleValue {
            c_enum_to_rust_enum(type_)
        }
    }

    pub enum CssFontWeightValue {
        CssFontWeightInherit = 0x0,
        CssFontWeightNormal = 0x1,
        CssFontWeightBold = 0x2,
        CssFontWeightBolder = 0x3,
        CssFontWeightLighter = 0x4,
        CssFontWeight100 = 0x5,
        CssFontWeight200 = 0x6,
        CssFontWeight300 = 0x7,
        CssFontWeight400 = 0x8,
        CssFontWeight500 = 0x9,
        CssFontWeight600 = 0xa,
        CssFontWeight700 = 0xb,
        CssFontWeight800 = 0xc,
        CssFontWeight900 = 0xd
    }

    impl CssFontWeightValue {
        pub fn new(type_: css_font_weight_e) -> CssFontWeightValue {
            c_enum_to_rust_enum(type_)
        }
    }

    enum CssTextAlignValue {
	CssTextAlignInherit = 0x0,
	CssTextAlignInheritIfNonMagic = 0x1,
	CssTextAlignLeft = 0x2,
	CssTextAlignRight = 0x3,
	CssTextAlignCenter = 0x4,
	CssTextAlignJustify = 0x5,
	CssTextAlignDefault = 0x6,
	CssTextAlignLibcssLeft = 0x7,
	CssTextAlignLibcssCenter = 0x8,
	CssTextAlignLibcssRight	= 0x9
    }

    impl CssTextAlignValue {
        pub fn new(type_: css_text_align_e) -> CssTextAlignValue {
            c_enum_to_rust_enum(type_)
        }
    }

    enum CssTextDecorationValue{
    CssTextDecorationInherit = 0x00,
    CssTextDecorationNone = 0x10,
    CssTextDecorationBlink = (1<<3),
    CssTextDecorationLineThrough = (1<<2),
    CssTextDecorationOverline = (1<<1),
    CssTextDecorationUnderline = (1<<0),
    }

    impl CssTextDecorationValue {
        pub fn new(type_: css_text_decoration_e) -> CssTextDecorationValue {
            c_enum_to_rust_enum(type_)
        }
    }

    pub enum CssLineHeightValue {
        CssLineHeightInherit,
        CssLineHeightNumber(css_fixed),
        CssLineHeightDimension(CssUnit),
        CssLineHeightNormal
    }

    impl CssLineHeightValue {
        pub fn new(type_: css_line_height_e, length: css_fixed, unit: css_unit) -> CssLineHeightValue {
            if type_ == CSS_LINE_HEIGHT_INHERIT {
                CssLineHeightInherit
            } else if type_ == CSS_LINE_HEIGHT_NUMBER {
                CssLineHeightNumber(length)
            } else if type_ == CSS_LINE_HEIGHT_DIMENSION {
                CssLineHeightDimension(ll_unit_to_hl_unit(unit, length))
            } else if type_ == CSS_LINE_HEIGHT_NORMAL {
                CssLineHeightNormal
            } else {
                unimpl("line-height")
            }
        }
    }

    pub enum CssVerticalAlignValue {
        CssVerticalAlignInherit,
        CssVerticalAlignBaseline,
        CssVerticalAlignSub,
        CssVerticalAlignSuper,
        CssVerticalAlignTop,
        CssVerticalAlignTextTop,
        CssVerticalAlignMiddle,
        CssVerticalAlignBottom,
        CssVerticalAlignTextBottom,
        CssVerticalAlignDimension(CssUnit),
    }

    impl CssVerticalAlignValue {
        pub fn new(type_: css_vertical_align_e, length: css_fixed, unit: css_unit) -> CssVerticalAlignValue {
            match type_ {
                CSS_VERTICAL_ALIGN_INHERIT => CssVerticalAlignInherit,
                CSS_VERTICAL_ALIGN_BASELINE => CssVerticalAlignBaseline,
                CSS_VERTICAL_ALIGN_SUB => CssVerticalAlignSub,
                CSS_VERTICAL_ALIGN_SUPER => CssVerticalAlignSuper,
                CSS_VERTICAL_ALIGN_TOP => CssVerticalAlignTop,
                CSS_VERTICAL_ALIGN_TEXTTOP => CssVerticalAlignTextTop,
                CSS_VERTICAL_ALIGN_MIDDLE => CssVerticalAlignMiddle,
                CSS_VERTICAL_ALIGN_BOTTOM => CssVerticalAlignBottom,
                CSS_VERTICAL_ALIGN_TEXTBOTTOM => CssVerticalAlignTextBottom,
                CSS_VERTICAL_ALIGN_DIMENSION => CssVerticalAlignDimension(ll_unit_to_hl_unit(unit, length)),
                _ => { unimpl("vertical-align") }
            }
        }
    }

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

}