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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 https://mozilla.org/MPL/2.0/. */
//! Parsing stylesheets from bytes (not `&str`).
extern crate encoding_rs;
use crate::context::QuirksMode;
use crate::error_reporting::ParseErrorReporter;
use crate::media_queries::MediaList;
use crate::shared_lock::SharedRwLock;
use crate::stylesheets::{AllowImportRules, Origin, Stylesheet, StylesheetLoader, UrlExtraData};
use cssparser::{stylesheet_encoding, EncodingSupport};
use servo_arc::Arc;
use std::borrow::Cow;
use std::str;
struct EncodingRs;
impl EncodingSupport for EncodingRs {
type Encoding = &'static encoding_rs::Encoding;
fn utf8() -> Self::Encoding {
encoding_rs::UTF_8
}
fn is_utf16_be_or_le(encoding: &Self::Encoding) -> bool {
*encoding == encoding_rs::UTF_16LE || *encoding == encoding_rs::UTF_16BE
}
fn from_label(ascii_label: &[u8]) -> Option<Self::Encoding> {
encoding_rs::Encoding::for_label(ascii_label)
}
}
fn decode_stylesheet_bytes<'a>(
css: &'a [u8],
protocol_encoding_label: Option<&str>,
environment_encoding: Option<&'static encoding_rs::Encoding>,
) -> Cow<'a, str> {
let fallback_encoding = stylesheet_encoding::<EncodingRs>(
css,
protocol_encoding_label.map(str::as_bytes),
environment_encoding,
);
let (result, _used_encoding, _) = fallback_encoding.decode(&css);
// FIXME record used encoding for environment encoding of @import
result
}
impl Stylesheet {
/// Parse a stylesheet from a set of bytes, potentially received over the
/// network.
///
/// Takes care of decoding the network bytes and forwards the resulting
/// string to `Stylesheet::from_str`.
pub fn from_bytes(
bytes: &[u8],
url_data: UrlExtraData,
protocol_encoding_label: Option<&str>,
environment_encoding: Option<&'static encoding_rs::Encoding>,
origin: Origin,
media: MediaList,
shared_lock: SharedRwLock,
stylesheet_loader: Option<&dyn StylesheetLoader>,
error_reporter: Option<&dyn ParseErrorReporter>,
quirks_mode: QuirksMode,
) -> Stylesheet {
let string = decode_stylesheet_bytes(bytes, protocol_encoding_label, environment_encoding);
Stylesheet::from_str(
&string,
url_data,
origin,
Arc::new(shared_lock.wrap(media)),
shared_lock,
stylesheet_loader,
error_reporter,
quirks_mode,
0,
AllowImportRules::Yes,
)
}
/// Updates an empty stylesheet with a set of bytes that reached over the
/// network.
pub fn update_from_bytes(
existing: &Stylesheet,
bytes: &[u8],
protocol_encoding_label: Option<&str>,
environment_encoding: Option<&'static encoding_rs::Encoding>,
url_data: UrlExtraData,
stylesheet_loader: Option<&dyn StylesheetLoader>,
error_reporter: Option<&dyn ParseErrorReporter>,
) {
let string = decode_stylesheet_bytes(bytes, protocol_encoding_label, environment_encoding);
Self::update_from_str(
existing,
&string,
url_data,
stylesheet_loader,
error_reporter,
0,
AllowImportRules::Yes,
)
}
}