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Add FFI glue for Gecko to implement 1-arg CSS.supports() with stylo.

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This commit is contained in:
Cameron McCormack 2016-07-18 16:21:18 +08:00
parent d87ea67bf2
commit 64c47ed720
2 changed files with 19 additions and 2 deletions
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2
ports/geckolib/gecko_bindings/bindings.rs
View file

@ -288,6 +288,8 @@ extern "C" {
*mut ServoDeclarationBlock);
pub fn Servo_ClearDeclarationBlockCachePointer(declarations:
*mut ServoDeclarationBlock);
pub fn Servo_CSSSupports(property: *const u8, property_length: u32,
value: *const u8, value_length: u32) -> bool;
pub fn Servo_GetComputedValues(node: *mut RawGeckoNode)
-> *mut ServoComputedValues;
pub fn Servo_GetComputedValuesForAnonymousBox(parentStyleOrNull:

19
ports/geckolib/glue.rs
View file

@ -28,13 +28,13 @@ use style::dom::{TDocument, TElement, TNode};
use style::error_reporting::StdoutErrorReporter;
use style::parallel;
use style::parser::ParserContextExtraData;
use style::properties::{ComputedValues, PropertyDeclarationBlock};
use style::properties::{ComputedValues, PropertyDeclarationBlock, parse_one_declaration};
use style::selector_impl::{SelectorImplExt, PseudoElementCascadeType};
use style::sequential;
use style::stylesheets::Origin;
use traversal::RecalcStyleOnly;
use url::Url;
use wrapper::{GeckoDocument, GeckoElement, GeckoNode, NonOpaqueStyleData};
use wrapper::{DUMMY_BASE_URL, GeckoDocument, GeckoElement, GeckoNode, NonOpaqueStyleData};
// TODO: This is ugly and should go away once we get an atom back-end.
pub fn pseudo_element_from_atom(pseudo: *mut nsIAtom,
@ -471,3 +471,18 @@ pub extern "C" fn Servo_ClearDeclarationBlockCachePointer(declarations: *mut Ser
let declarations = unsafe { (declarations as *mut GeckoDeclarationBlock).as_mut().unwrap() };
declarations.cache = ptr::null_mut();
}
#[no_mangle]
pub extern "C" fn Servo_CSSSupports(property: *const u8, property_length: u32,
value: *const u8, value_length: u32) -> bool {
let property = unsafe { from_utf8_unchecked(slice::from_raw_parts(property, property_length as usize)) };
let value = unsafe { from_utf8_unchecked(slice::from_raw_parts(value, value_length as usize)) };
let base_url = &*DUMMY_BASE_URL;
let extra_data = ParserContextExtraData::default();
match parse_one_declaration(&property, &value, &base_url, Box::new(StdoutErrorReporter), extra_data) {
Ok(decls) => !decls.is_empty(),
Err(()) => false,
}
}