From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 21:33:14 +0200 Subject: Adding upstream version 115.7.0esr. Signed-off-by: Daniel Baumann --- servo/components/style/gecko/url.rs | 383 ++++++++++++++++++++++++++++++++++++ 1 file changed, 383 insertions(+) create mode 100644 servo/components/style/gecko/url.rs (limited to 'servo/components/style/gecko/url.rs') diff --git a/servo/components/style/gecko/url.rs b/servo/components/style/gecko/url.rs new file mode 100644 index 0000000000..8cf4aa51c0 --- /dev/null +++ b/servo/components/style/gecko/url.rs @@ -0,0 +1,383 @@ +/* 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/. */ + +//! Common handling for the specified value CSS url() values. + +use crate::gecko_bindings::bindings; +use crate::gecko_bindings::structs; +use crate::parser::{Parse, ParserContext}; +use crate::stylesheets::{CorsMode, UrlExtraData}; +use crate::values::computed::{Context, ToComputedValue}; +use cssparser::Parser; +use malloc_size_of::{MallocSizeOf, MallocSizeOfOps}; +use nsstring::nsCString; +use servo_arc::Arc; +use std::collections::HashMap; +use std::fmt::{self, Write}; +use std::mem::ManuallyDrop; +use std::sync::RwLock; +use style_traits::{CssWriter, ParseError, ToCss}; +use to_shmem::{self, SharedMemoryBuilder, ToShmem}; + +/// A CSS url() value for gecko. +#[derive(Clone, Debug, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)] +#[css(function = "url")] +#[repr(C)] +pub struct CssUrl(pub Arc); + +/// Data shared between CssUrls. +/// +/// cbindgen:derive-eq=false +/// cbindgen:derive-neq=false +#[derive(Debug, SpecifiedValueInfo, ToCss, ToShmem)] +#[repr(C)] +pub struct CssUrlData { + /// The URL in unresolved string form. + serialization: crate::OwnedStr, + + /// The URL extra data. + #[css(skip)] + pub extra_data: UrlExtraData, + + /// The CORS mode that will be used for the load. + #[css(skip)] + cors_mode: CorsMode, + + /// Data to trigger a load from Gecko. This is mutable in C++. + /// + /// TODO(emilio): Maybe we can eagerly resolve URLs and make this immutable? + #[css(skip)] + load_data: LoadDataSource, +} + +impl PartialEq for CssUrlData { + fn eq(&self, other: &Self) -> bool { + self.serialization == other.serialization && + self.extra_data == other.extra_data && + self.cors_mode == other.cors_mode + } +} + +impl CssUrl { + fn parse_with_cors_mode<'i, 't>( + context: &ParserContext, + input: &mut Parser<'i, 't>, + cors_mode: CorsMode, + ) -> Result> { + let url = input.expect_url()?; + Ok(Self::parse_from_string( + url.as_ref().to_owned(), + context, + cors_mode, + )) + } + + /// Parse a URL from a string value that is a valid CSS token for a URL. + pub fn parse_from_string(url: String, context: &ParserContext, cors_mode: CorsMode) -> Self { + CssUrl(Arc::new(CssUrlData { + serialization: url.into(), + extra_data: context.url_data.clone(), + cors_mode, + load_data: LoadDataSource::Owned(LoadData::default()), + })) + } + + /// Returns true if the URL is definitely invalid. We don't eagerly resolve + /// URLs in gecko, so we just return false here. + /// use its |resolved| status. + pub fn is_invalid(&self) -> bool { + false + } + + /// Returns true if this URL looks like a fragment. + /// See https://drafts.csswg.org/css-values/#local-urls + #[inline] + pub fn is_fragment(&self) -> bool { + self.0.is_fragment() + } + + /// Return the unresolved url as string, or the empty string if it's + /// invalid. + #[inline] + pub fn as_str(&self) -> &str { + self.0.as_str() + } +} + +impl CssUrlData { + /// Returns true if this URL looks like a fragment. + /// See https://drafts.csswg.org/css-values/#local-urls + pub fn is_fragment(&self) -> bool { + self.as_str() + .as_bytes() + .iter() + .next() + .map_or(false, |b| *b == b'#') + } + + /// Return the unresolved url as string, or the empty string if it's + /// invalid. + pub fn as_str(&self) -> &str { + &*self.serialization + } +} + +impl Parse for CssUrl { + fn parse<'i, 't>( + context: &ParserContext, + input: &mut Parser<'i, 't>, + ) -> Result> { + Self::parse_with_cors_mode(context, input, CorsMode::None) + } +} + +impl Eq for CssUrl {} + +impl MallocSizeOf for CssUrl { + fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize { + // XXX: measure `serialization` once bug 1397971 lands + + // We ignore `extra_data`, because RefPtr is tricky, and there aren't + // many of them in practise (sharing is common). + + 0 + } +} + +/// A key type for LOAD_DATA_TABLE. +#[derive(Eq, Hash, PartialEq)] +struct LoadDataKey(*const LoadDataSource); + +unsafe impl Sync for LoadDataKey {} +unsafe impl Send for LoadDataKey {} + +bitflags! { + /// Various bits of mutable state that are kept for image loads. + #[repr(C)] + pub struct LoadDataFlags: u8 { + /// Whether we tried to resolve the uri at least once. + const TRIED_TO_RESOLVE_URI = 1 << 0; + /// Whether we tried to resolve the image at least once. + const TRIED_TO_RESOLVE_IMAGE = 1 << 1; + } +} + +/// This is usable and movable from multiple threads just fine, as long as it's +/// not cloned (it is not clonable), and the methods that mutate it run only on +/// the main thread (when all the other threads we care about are paused). +unsafe impl Sync for LoadData {} +unsafe impl Send for LoadData {} + +/// The load data for a given URL. This is mutable from C++, and shouldn't be +/// accessed from rust for anything. +#[repr(C)] +#[derive(Debug)] +pub struct LoadData { + /// A strong reference to the imgRequestProxy, if any, that should be + /// released on drop. + /// + /// These are raw pointers because they are not safe to reference-count off + /// the main thread. + resolved_image: *mut structs::imgRequestProxy, + /// A strong reference to the resolved URI of this image. + resolved_uri: *mut structs::nsIURI, + /// A few flags that are set when resolving the image or such. + flags: LoadDataFlags, +} + +impl Drop for LoadData { + fn drop(&mut self) { + unsafe { bindings::Gecko_LoadData_Drop(self) } + } +} + +impl Default for LoadData { + fn default() -> Self { + Self { + resolved_image: std::ptr::null_mut(), + resolved_uri: std::ptr::null_mut(), + flags: LoadDataFlags::empty(), + } + } +} + +/// The data for a load, or a lazy-loaded, static member that will be stored in +/// LOAD_DATA_TABLE, keyed by the memory location of this object, which is +/// always in the heap because it's inside the CssUrlData object. +/// +/// This type is meant not to be used from C++ so we don't derive helper +/// methods. +/// +/// cbindgen:derive-helper-methods=false +#[derive(Debug)] +#[repr(u8, C)] +pub enum LoadDataSource { + /// An owned copy of the load data. + Owned(LoadData), + /// A lazily-resolved copy of it. + Lazy, +} + +impl LoadDataSource { + /// Gets the load data associated with the source. + /// + /// This relies on the source on being in a stable location if lazy. + #[inline] + pub unsafe fn get(&self) -> *const LoadData { + match *self { + LoadDataSource::Owned(ref d) => return d, + LoadDataSource::Lazy => {}, + } + + let key = LoadDataKey(self); + + { + let guard = LOAD_DATA_TABLE.read().unwrap(); + if let Some(r) = guard.get(&key) { + return &**r; + } + } + let mut guard = LOAD_DATA_TABLE.write().unwrap(); + let r = guard.entry(key).or_insert_with(Default::default); + &**r + } +} + +impl ToShmem for LoadDataSource { + fn to_shmem(&self, _builder: &mut SharedMemoryBuilder) -> to_shmem::Result { + Ok(ManuallyDrop::new(match self { + LoadDataSource::Owned(..) => LoadDataSource::Lazy, + LoadDataSource::Lazy => LoadDataSource::Lazy, + })) + } +} + +/// A specified non-image `url()` value. +pub type SpecifiedUrl = CssUrl; + +/// Clears LOAD_DATA_TABLE. Entries in this table, which are for specified URL +/// values that come from shared memory style sheets, would otherwise persist +/// until the end of the process and be reported as leaks. +pub fn shutdown() { + LOAD_DATA_TABLE.write().unwrap().clear(); +} + +impl ToComputedValue for SpecifiedUrl { + type ComputedValue = ComputedUrl; + + #[inline] + fn to_computed_value(&self, _: &Context) -> Self::ComputedValue { + ComputedUrl(self.clone()) + } + + #[inline] + fn from_computed_value(computed: &Self::ComputedValue) -> Self { + computed.0.clone() + } +} + +/// A specified image `url()` value. +#[derive(Clone, Debug, Eq, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)] +pub struct SpecifiedImageUrl(pub SpecifiedUrl); + +impl SpecifiedImageUrl { + /// Parse a URL from a string value that is a valid CSS token for a URL. + pub fn parse_from_string(url: String, context: &ParserContext, cors_mode: CorsMode) -> Self { + SpecifiedImageUrl(SpecifiedUrl::parse_from_string(url, context, cors_mode)) + } + + /// Provides an alternate method for parsing that associates the URL + /// with anonymous CORS headers. + pub fn parse_with_cors_mode<'i, 't>( + context: &ParserContext, + input: &mut Parser<'i, 't>, + cors_mode: CorsMode, + ) -> Result> { + Ok(SpecifiedImageUrl(SpecifiedUrl::parse_with_cors_mode( + context, input, cors_mode, + )?)) + } +} + +impl Parse for SpecifiedImageUrl { + fn parse<'i, 't>( + context: &ParserContext, + input: &mut Parser<'i, 't>, + ) -> Result> { + SpecifiedUrl::parse(context, input).map(SpecifiedImageUrl) + } +} + +impl ToComputedValue for SpecifiedImageUrl { + type ComputedValue = ComputedImageUrl; + + #[inline] + fn to_computed_value(&self, context: &Context) -> Self::ComputedValue { + ComputedImageUrl(self.0.to_computed_value(context)) + } + + #[inline] + fn from_computed_value(computed: &Self::ComputedValue) -> Self { + SpecifiedImageUrl(ToComputedValue::from_computed_value(&computed.0)) + } +} + +/// The computed value of a CSS non-image `url()`. +/// +/// The only difference between specified and computed URLs is the +/// serialization. +#[derive(Clone, Debug, Eq, MallocSizeOf, PartialEq)] +#[repr(C)] +pub struct ComputedUrl(pub SpecifiedUrl); + +impl ComputedUrl { + fn serialize_with( + &self, + function: unsafe extern "C" fn(*const Self, *mut nsCString), + dest: &mut CssWriter, + ) -> fmt::Result + where + W: Write, + { + dest.write_str("url(")?; + unsafe { + let mut string = nsCString::new(); + function(self, &mut string); + string.as_str_unchecked().to_css(dest)?; + } + dest.write_char(')') + } +} + +impl ToCss for ComputedUrl { + fn to_css(&self, dest: &mut CssWriter) -> fmt::Result + where + W: Write, + { + self.serialize_with(bindings::Gecko_GetComputedURLSpec, dest) + } +} + +/// The computed value of a CSS image `url()`. +#[derive(Clone, Debug, Eq, MallocSizeOf, PartialEq)] +#[repr(transparent)] +pub struct ComputedImageUrl(pub ComputedUrl); + +impl ToCss for ComputedImageUrl { + fn to_css(&self, dest: &mut CssWriter) -> fmt::Result + where + W: Write, + { + self.0 + .serialize_with(bindings::Gecko_GetComputedImageURLSpec, dest) + } +} + +lazy_static! { + /// A table mapping CssUrlData objects to their lazily created LoadData + /// objects. + static ref LOAD_DATA_TABLE: RwLock>> = { + Default::default() + }; +} -- cgit v1.2.3