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Bug 1331213: Add sugar for nsCSSValue and nsCSSValue::Array. r=heycam…
… r=Manishearth I will use this soon to implement the media query evaluation code. Please review carefully. MozReview-Commit-ID: HXelawXBfH8 Signed-off-by: Emilio Cobos Álvarez <emilio@crisal.io>
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/* 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/. */ | ||
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//! Little helpers for `nsCSSValue`. | ||
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use gecko_bindings::bindings::Gecko_CSSValue_Drop; | ||
use gecko_bindings::structs::{nsCSSValue, nsCSSUnit, nsCSSValue_Array}; | ||
use std::mem; | ||
use std::ops::Index; | ||
use std::slice; | ||
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impl nsCSSValue { | ||
/// Create a CSSValue with null unit, useful to be used as a return value. | ||
#[inline] | ||
pub fn null() -> Self { | ||
unsafe { mem::zeroed() } | ||
} | ||
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/// Returns this nsCSSValue value as an integer, unchecked in release | ||
/// builds. | ||
pub fn integer_unchecked(&self) -> i32 { | ||
debug_assert!(self.mUnit == nsCSSUnit::eCSSUnit_Integer || | ||
self.mUnit == nsCSSUnit::eCSSUnit_Enumerated || | ||
self.mUnit == nsCSSUnit::eCSSUnit_EnumColor); | ||
unsafe { *self.mValue.mInt.as_ref() } | ||
} | ||
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/// Returns this nsCSSValue value as a floating point value, unchecked in | ||
/// release builds. | ||
pub fn float_unchecked(&self) -> f32 { | ||
debug_assert!(nsCSSUnit::eCSSUnit_Number as u32 <= self.mUnit as u32); | ||
unsafe { *self.mValue.mFloat.as_ref() } | ||
} | ||
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/// Returns this nsCSSValue as a nsCSSValue::Array, unchecked in release | ||
/// builds. | ||
pub unsafe fn array_unchecked(&self) -> &nsCSSValue_Array { | ||
debug_assert!(nsCSSUnit::eCSSUnit_Array as u32 <= self.mUnit as u32 && | ||
self.mUnit as u32 <= nsCSSUnit::eCSSUnit_Calc_Divided as u32); | ||
let array = *self.mValue.mArray.as_ref(); | ||
debug_assert!(!array.is_null()); | ||
&*array | ||
} | ||
} | ||
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impl Drop for nsCSSValue { | ||
fn drop(&mut self) { | ||
unsafe { Gecko_CSSValue_Drop(self) }; | ||
} | ||
} | ||
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impl nsCSSValue_Array { | ||
/// Return the length of this `nsCSSShadowArray` | ||
#[inline] | ||
pub fn len(&self) -> usize { | ||
self.mCount | ||
} | ||
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#[inline] | ||
fn buffer(&self) -> *const nsCSSValue { | ||
self.mArray.as_ptr() | ||
} | ||
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/// Get the array as a slice of nsCSSValues. | ||
#[inline] | ||
pub fn as_slice(&self) -> &[nsCSSValue] { | ||
unsafe { slice::from_raw_parts(self.buffer(), self.len()) } | ||
} | ||
} | ||
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impl Index<usize> for nsCSSValue_Array { | ||
type Output = nsCSSValue; | ||
#[inline] | ||
fn index(&self, i: usize) -> &nsCSSValue { | ||
&self.as_slice()[i] | ||
} | ||
} |