servo/components/style/gecko/rules.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/. */

//! Bindings for CSS Rule objects

use computed_values::{font_style, font_weight, font_stretch};
use computed_values::font_family::FamilyName;
use counter_style;
use cssparser::UnicodeRange;
use font_face::{FontFaceRuleData, Source};
use gecko_bindings::bindings;
use gecko_bindings::structs::{self, nsCSSFontFaceRule, nsCSSValue, nsCSSCounterDesc};
use gecko_bindings::sugar::ns_css_value::ToNsCssValue;
use gecko_bindings::sugar::refptr::{RefPtr, UniqueRefPtr};
use shared_lock::{ToCssWithGuard, SharedRwLockReadGuard};
use std::fmt;

/// A @font-face rule
pub type FontFaceRule = RefPtr<nsCSSFontFaceRule>;

impl ToNsCssValue for FamilyName {
    fn convert(&self, nscssvalue: &mut nsCSSValue) {
        nscssvalue.set_string_from_atom(&self.name)
    }
}

impl ToNsCssValue for font_weight::T {
    fn convert(&self, nscssvalue: &mut nsCSSValue) {
        nscssvalue.set_integer(*self as i32)
    }
}

macro_rules! map_enum {
    (
        $(
            $prop:ident {
                $($servo:ident => $gecko:ident,)+
            }
        )+
    ) => {
        $(
            impl ToNsCssValue for $prop::T {
                fn convert(&self, nscssvalue: &mut nsCSSValue) {
                    nscssvalue.set_enum(match *self {
                        $( $prop::T::$servo => structs::$gecko as i32, )+
                    })
                }
            }
        )+
    }
}

map_enum! {
    font_style {
        normal => NS_FONT_STYLE_NORMAL,
        italic => NS_FONT_STYLE_ITALIC,
        oblique => NS_FONT_STYLE_OBLIQUE,
    }

    font_stretch {
        normal          => NS_FONT_STRETCH_NORMAL,
        ultra_condensed => NS_FONT_STRETCH_ULTRA_CONDENSED,
        extra_condensed => NS_FONT_STRETCH_EXTRA_CONDENSED,
        condensed       => NS_FONT_STRETCH_CONDENSED,
        semi_condensed  => NS_FONT_STRETCH_SEMI_CONDENSED,
        semi_expanded   => NS_FONT_STRETCH_SEMI_EXPANDED,
        expanded        => NS_FONT_STRETCH_EXPANDED,
        extra_expanded  => NS_FONT_STRETCH_EXTRA_EXPANDED,
        ultra_expanded  => NS_FONT_STRETCH_ULTRA_EXPANDED,
    }
}

impl ToNsCssValue for Vec<Source> {
    fn convert(&self, nscssvalue: &mut nsCSSValue) {
        let src_len = self.iter().fold(0, |acc, src| {
            acc + match *src {
                // Each format hint takes one position in the array of mSrc.
                Source::Url(ref url) => url.format_hints.len() + 1,
                Source::Local(_) => 1,
            }
        });
        let mut target_srcs =
            nscssvalue.set_array(src_len as i32).as_mut_slice().iter_mut();
        macro_rules! next { () => {
            target_srcs.next().expect("Length of target_srcs should be enough")
        } }
        for src in self.iter() {
            match *src {
                Source::Url(ref url) => {
                    next!().set_url(&url.url);
                    for hint in url.format_hints.iter() {
                        next!().set_font_format(&hint);
                    }
                }
                Source::Local(ref family) => {
                    next!().set_local_font(&family.name);
                }
            }
        }
        debug_assert!(target_srcs.next().is_none(), "Should have filled all slots");
    }
}

impl ToNsCssValue for Vec<UnicodeRange> {
    fn convert(&self, nscssvalue: &mut nsCSSValue) {
        let target_ranges = nscssvalue
            .set_array((self.len() * 2) as i32)
            .as_mut_slice().chunks_mut(2);
        for (range, target) in self.iter().zip(target_ranges) {
            target[0].set_integer(range.start as i32);
            target[1].set_integer(range.end as i32);
        }
    }
}

impl From<FontFaceRuleData> for FontFaceRule {
    fn from(data: FontFaceRuleData) -> FontFaceRule {
        let mut result = unsafe {
            UniqueRefPtr::from_addrefed(bindings::Gecko_CSSFontFaceRule_Create())
        };
        data.set_descriptors(&mut result.mDecl.mDescriptors);
        result.get()
    }
}

impl ToCssWithGuard for FontFaceRule {
    fn to_css<W>(&self, _guard: &SharedRwLockReadGuard, dest: &mut W) -> fmt::Result
    where W: fmt::Write {
        ns_auto_string!(css_text);
        unsafe {
            bindings::Gecko_CSSFontFaceRule_GetCssText(self.get(), &mut *css_text);
        }
        write!(dest, "{}", css_text)
    }
}

/// The type of nsCSSCounterStyleRule::mValues
pub type CounterStyleDescriptors = [nsCSSValue; nsCSSCounterDesc::eCSSCounterDesc_COUNT as usize];

impl ToNsCssValue for counter_style::System {
    fn convert(&self, nscssvalue: &mut nsCSSValue) {
        use counter_style::System::*;
        match *self {
            Cyclic => nscssvalue.set_enum(structs::NS_STYLE_COUNTER_SYSTEM_CYCLIC as i32),
            Numeric => nscssvalue.set_enum(structs::NS_STYLE_COUNTER_SYSTEM_NUMERIC as i32),
            Alphabetic => nscssvalue.set_enum(structs::NS_STYLE_COUNTER_SYSTEM_ALPHABETIC as i32),
            Symbolic => nscssvalue.set_enum(structs::NS_STYLE_COUNTER_SYSTEM_SYMBOLIC as i32),
            Additive => nscssvalue.set_enum(structs::NS_STYLE_COUNTER_SYSTEM_ADDITIVE as i32),
            Fixed { first_symbol_value } => {
                let mut a = nsCSSValue::null();
                let mut b = nsCSSValue::null();
                a.set_enum(structs::NS_STYLE_COUNTER_SYSTEM_FIXED as i32);
                b.set_integer(first_symbol_value.unwrap_or(1));
                //nscssvalue.set_pair(a, b);  // FIXME: add bindings for nsCSSValue::SetPairValue
            }
            Extends(ref other) => {
                let mut a = nsCSSValue::null();
                let mut b = nsCSSValue::null();
                a.set_enum(structs::NS_STYLE_COUNTER_SYSTEM_EXTENDS as i32);
                b.set_string_from_atom(&other.0);
                //nscssvalue.set_pair(a, b);  // FIXME: add bindings for nsCSSValue::SetPairValue
            }
        }
    }
}

impl ToNsCssValue for counter_style::Negative {
    fn convert(&self, nscssvalue: &mut nsCSSValue) {
        if let Some(ref second) = self.1 {
            let mut a = nsCSSValue::null();
            let mut b = nsCSSValue::null();
            a.set_from(&self.0);
            b.set_from(second);
            //nscssvalue.set_pair(a, b);  // FIXME: add bindings for nsCSSValue::SetPairValue
        } else {
            nscssvalue.set_from(&self.0)
        }
    }
}

impl ToNsCssValue for counter_style::Symbol {
    fn convert(&self, nscssvalue: &mut nsCSSValue) {
        match *self {
            counter_style::Symbol::String(ref s) => nscssvalue.set_string(s),
            counter_style::Symbol::Ident(ref s) => nscssvalue.set_ident(s),
        }
    }
}

impl ToNsCssValue for counter_style::Ranges {
    fn convert(&self, _nscssvalue: &mut nsCSSValue) {
        if self.0.is_empty() {
            //nscssvalue.set_auto();  // FIXME: add bindings for nsCSSValue::SetAutoValue
        } else {
            for range in &self.0 {
                fn set_bound(bound: Option<i32>, nscssvalue: &mut nsCSSValue) {
                    if let Some(finite) = bound {
                        nscssvalue.set_integer(finite)
                    } else {
                        nscssvalue.set_enum(structs::NS_STYLE_COUNTER_RANGE_INFINITE as i32)
                    }
                }
                let mut start = nsCSSValue::null();
                let mut end = nsCSSValue::null();
                set_bound(range.start, &mut start);
                set_bound(range.end, &mut end);
                // FIXME: add bindings for nsCSSValuePairList
            }
        }
    }
}

impl ToNsCssValue for counter_style::Pad {
    fn convert(&self, _nscssvalue: &mut nsCSSValue) {
        let mut min_length = nsCSSValue::null();
        let mut pad_with = nsCSSValue::null();
        min_length.set_integer(self.0 as i32);
        pad_with.set_from(&self.1);
        // FIXME: add bindings for nsCSSValue::SetPairValue
        //nscssvalue.set_pair(min_length, pad_with);
    }
}

impl ToNsCssValue for counter_style::Fallback {
    fn convert(&self, nscssvalue: &mut nsCSSValue) {
        nscssvalue.set_ident_from_atom(&self.0 .0)
    }
}

impl ToNsCssValue for counter_style::Symbols {
    fn convert(&self, _nscssvalue: &mut nsCSSValue) {
        debug_assert!(!self.0.is_empty());
        // FIXME: add bindings for nsCSSValueList
    }
}

impl ToNsCssValue for counter_style::AdditiveSymbols {
    fn convert(&self, _nscssvalue: &mut nsCSSValue) {
        debug_assert!(!self.0.is_empty());
        // FIXME: add bindings for nsCSSValuePairList
    }
}

impl ToNsCssValue for counter_style::SpeakAs {
    fn convert(&self, nscssvalue: &mut nsCSSValue) {
        use counter_style::SpeakAs::*;
        match *self {
            Auto => {} //nscssvalue.set_auto(),  // FIXME: add bindings for nsCSSValue::SetAutoValue
            Bullets => nscssvalue.set_enum(structs::NS_STYLE_COUNTER_SPEAKAS_BULLETS as i32),
            Numbers => nscssvalue.set_enum(structs::NS_STYLE_COUNTER_SPEAKAS_NUMBERS as i32),
            Words => nscssvalue.set_enum(structs::NS_STYLE_COUNTER_SPEAKAS_WORDS as i32),
            Other(ref other) => nscssvalue.set_ident_from_atom(&other.0),
        }
    }
}