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Bug 1364412: Convert pseudo-elements to an enum. r=hiro,xidorn

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This commit is contained in:
Emilio Cobos Álvarez 2017-05-15 22:24:37 +02:00
parent 0bc185f1c2
commit 5820e3ecac
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GPG key ID: 056B727BB9C1027C
17 changed files with 2260 additions and 1505 deletions
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23
components/style/gecko/generated/bindings.rs
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@ -26,6 +26,7 @@ use gecko_bindings::structs::RawGeckoServoStyleRuleList;
use gecko_bindings::structs::RawGeckoURLExtraData;
use gecko_bindings::structs::RefPtr;
use gecko_bindings::structs::CSSPseudoClassType;
use gecko_bindings::structs::CSSPseudoElementType;
use gecko_bindings::structs::TraversalRestyleBehavior;
use gecko_bindings::structs::TraversalRootBehavior;
use gecko_bindings::structs::ComputedTimingFunction_BeforeFlag;
@ -905,7 +906,7 @@ extern "C" {
}
extern "C" {
pub fn Gecko_GetImplementedPseudo(element: RawGeckoElementBorrowed)
-> *mut nsIAtom;
-> CSSPseudoElementType;
}
extern "C" {
pub fn Gecko_CalcStyleDifference(oldstyle: *mut nsStyleContext,
@ -2217,7 +2218,7 @@ extern "C" {
extern "C" {
pub fn Servo_ComputedValues_GetForAnonymousBox(parent_style_or_null:
ServoComputedValuesBorrowedOrNull,
pseudoTag: *mut nsIAtom,
pseudo_tag: *mut nsIAtom,
skip_display_fixup: bool,
set:
RawServoStyleSetBorrowed)
@ -2257,25 +2258,19 @@ extern "C" {
}
extern "C" {
pub fn Servo_ResolvePseudoStyle(element: RawGeckoElementBorrowed,
pseudo_tag: *mut nsIAtom, is_probe: bool,
pseudo_type: CSSPseudoElementType,
is_probe: bool,
set: RawServoStyleSetBorrowed)
-> ServoComputedValuesStrong;
}
extern "C" {
pub fn Servo_ResolveRuleNode(element: RawGeckoElementBorrowed,
pseudo_tag: *mut nsIAtom,
set: RawServoStyleSetBorrowed)
-> RawServoRuleNodeStrong;
}
extern "C" {
pub fn Servo_HasAuthorSpecifiedRules(rule_node: RawServoRuleNodeBorrowed,
element: RawGeckoElementBorrowed,
pub fn Servo_HasAuthorSpecifiedRules(element: RawGeckoElementBorrowed,
rule_type_mask: u32,
author_colors_allowed: bool) -> bool;
}
extern "C" {
pub fn Servo_ResolveStyleLazily(element: RawGeckoElementBorrowed,
pseudo_tag: *mut nsIAtom,
pseudo_type: CSSPseudoElementType,
snapshots:
*const ServoElementSnapshotTable,
set: RawServoStyleSetBorrowed)
@ -2299,8 +2294,8 @@ extern "C" {
RawGeckoElementBorrowed,
snapshots:
*const ServoElementSnapshotTable,
pseudo_tag:
*mut nsIAtom)
pseudo_type:
CSSPseudoElementType)
-> ServoComputedValuesStrong;
}
extern "C" {

1252
components/style/gecko/generated/pseudo_element_definition.rs Normal file
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280
components/style/gecko/generated/pseudo_element_helper.rs
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@ -1,280 +0,0 @@
/* 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/. */
/* Autogenerated file created by components/style/binding_tools/regen_atoms.py, DO NOT EDIT DIRECTLY */
/*
* This file contains a helper macro invocation to aid Gecko's style system
* pseudo-element integration.
*
* This file is NOT INTENDED to be compiled as a standalone module.
*
* Also, it guarantees the property that normal pseudo-elements are processed
* before anonymous boxes.
*
* Expected usage is as follows:
*
* ```
* fn have_to_use_pseudo_elements() {
* macro_rules! pseudo_element {
* ($pseudo_str_with_colon:expr, $pseudo_atom:expr, $is_anon_box:true) => {{
* // Stuff stuff stuff.
* }}
* }
* include!("path/to/helper.rs")
* }
* ```
*
*/
{
pseudo_element!(":after",
atom!(":after"),
false);
pseudo_element!(":before",
atom!(":before"),
false);
pseudo_element!(":backdrop",
atom!(":backdrop"),
false);
pseudo_element!(":cue",
atom!(":cue"),
false);
pseudo_element!(":first-letter",
atom!(":first-letter"),
false);
pseudo_element!(":first-line",
atom!(":first-line"),
false);
pseudo_element!(":-moz-selection",
atom!(":-moz-selection"),
false);
pseudo_element!(":-moz-focus-inner",
atom!(":-moz-focus-inner"),
false);
pseudo_element!(":-moz-focus-outer",
atom!(":-moz-focus-outer"),
false);
pseudo_element!(":-moz-list-bullet",
atom!(":-moz-list-bullet"),
false);
pseudo_element!(":-moz-list-number",
atom!(":-moz-list-number"),
false);
pseudo_element!(":-moz-math-anonymous",
atom!(":-moz-math-anonymous"),
false);
pseudo_element!(":-moz-number-wrapper",
atom!(":-moz-number-wrapper"),
false);
pseudo_element!(":-moz-number-text",
atom!(":-moz-number-text"),
false);
pseudo_element!(":-moz-number-spin-box",
atom!(":-moz-number-spin-box"),
false);
pseudo_element!(":-moz-number-spin-up",
atom!(":-moz-number-spin-up"),
false);
pseudo_element!(":-moz-number-spin-down",
atom!(":-moz-number-spin-down"),
false);
pseudo_element!(":-moz-progress-bar",
atom!(":-moz-progress-bar"),
false);
pseudo_element!(":-moz-range-track",
atom!(":-moz-range-track"),
false);
pseudo_element!(":-moz-range-progress",
atom!(":-moz-range-progress"),
false);
pseudo_element!(":-moz-range-thumb",
atom!(":-moz-range-thumb"),
false);
pseudo_element!(":-moz-meter-bar",
atom!(":-moz-meter-bar"),
false);
pseudo_element!(":-moz-placeholder",
atom!(":-moz-placeholder"),
false);
pseudo_element!(":placeholder",
atom!(":placeholder"),
false);
pseudo_element!(":-moz-color-swatch",
atom!(":-moz-color-swatch"),
false);
pseudo_element!(":-moz-text",
atom!(":-moz-text"),
true);
pseudo_element!(":-moz-oof-placeholder",
atom!(":-moz-oof-placeholder"),
true);
pseudo_element!(":-moz-first-letter-continuation",
atom!(":-moz-first-letter-continuation"),
true);
pseudo_element!(":-moz-block-inside-inline-wrapper",
atom!(":-moz-block-inside-inline-wrapper"),
true);
pseudo_element!(":-moz-mathml-anonymous-block",
atom!(":-moz-mathml-anonymous-block"),
true);
pseudo_element!(":-moz-xul-anonymous-block",
atom!(":-moz-xul-anonymous-block"),
true);
pseudo_element!(":-moz-hframeset-border",
atom!(":-moz-hframeset-border"),
true);
pseudo_element!(":-moz-vframeset-border",
atom!(":-moz-vframeset-border"),
true);
pseudo_element!(":-moz-line-frame",
atom!(":-moz-line-frame"),
true);
pseudo_element!(":-moz-button-content",
atom!(":-moz-button-content"),
true);
pseudo_element!(":-moz-cell-content",
atom!(":-moz-cell-content"),
true);
pseudo_element!(":-moz-dropdown-list",
atom!(":-moz-dropdown-list"),
true);
pseudo_element!(":-moz-fieldset-content",
atom!(":-moz-fieldset-content"),
true);
pseudo_element!(":-moz-frameset-blank",
atom!(":-moz-frameset-blank"),
true);
pseudo_element!(":-moz-display-comboboxcontrol-frame",
atom!(":-moz-display-comboboxcontrol-frame"),
true);
pseudo_element!(":-moz-html-canvas-content",
atom!(":-moz-html-canvas-content"),
true);
pseudo_element!(":-moz-inline-table",
atom!(":-moz-inline-table"),
true);
pseudo_element!(":-moz-table",
atom!(":-moz-table"),
true);
pseudo_element!(":-moz-table-cell",
atom!(":-moz-table-cell"),
true);
pseudo_element!(":-moz-table-column-group",
atom!(":-moz-table-column-group"),
true);
pseudo_element!(":-moz-table-column",
atom!(":-moz-table-column"),
true);
pseudo_element!(":-moz-table-wrapper",
atom!(":-moz-table-wrapper"),
true);
pseudo_element!(":-moz-table-row-group",
atom!(":-moz-table-row-group"),
true);
pseudo_element!(":-moz-table-row",
atom!(":-moz-table-row"),
true);
pseudo_element!(":-moz-canvas",
atom!(":-moz-canvas"),
true);
pseudo_element!(":-moz-pagebreak",
atom!(":-moz-pagebreak"),
true);
pseudo_element!(":-moz-page",
atom!(":-moz-page"),
true);
pseudo_element!(":-moz-pagecontent",
atom!(":-moz-pagecontent"),
true);
pseudo_element!(":-moz-page-sequence",
atom!(":-moz-page-sequence"),
true);
pseudo_element!(":-moz-scrolled-content",
atom!(":-moz-scrolled-content"),
true);
pseudo_element!(":-moz-scrolled-canvas",
atom!(":-moz-scrolled-canvas"),
true);
pseudo_element!(":-moz-scrolled-page-sequence",
atom!(":-moz-scrolled-page-sequence"),
true);
pseudo_element!(":-moz-column-content",
atom!(":-moz-column-content"),
true);
pseudo_element!(":-moz-viewport",
atom!(":-moz-viewport"),
true);
pseudo_element!(":-moz-viewport-scroll",
atom!(":-moz-viewport-scroll"),
true);
pseudo_element!(":-moz-anonymous-flex-item",
atom!(":-moz-anonymous-flex-item"),
true);
pseudo_element!(":-moz-anonymous-grid-item",
atom!(":-moz-anonymous-grid-item"),
true);
pseudo_element!(":-moz-ruby",
atom!(":-moz-ruby"),
true);
pseudo_element!(":-moz-ruby-base",
atom!(":-moz-ruby-base"),
true);
pseudo_element!(":-moz-ruby-base-container",
atom!(":-moz-ruby-base-container"),
true);
pseudo_element!(":-moz-ruby-text",
atom!(":-moz-ruby-text"),
true);
pseudo_element!(":-moz-ruby-text-container",
atom!(":-moz-ruby-text-container"),
true);
pseudo_element!(":-moz-tree-column",
atom!(":-moz-tree-column"),
true);
pseudo_element!(":-moz-tree-row",
atom!(":-moz-tree-row"),
true);
pseudo_element!(":-moz-tree-separator",
atom!(":-moz-tree-separator"),
true);
pseudo_element!(":-moz-tree-cell",
atom!(":-moz-tree-cell"),
true);
pseudo_element!(":-moz-tree-indentation",
atom!(":-moz-tree-indentation"),
true);
pseudo_element!(":-moz-tree-line",
atom!(":-moz-tree-line"),
true);
pseudo_element!(":-moz-tree-twisty",
atom!(":-moz-tree-twisty"),
true);
pseudo_element!(":-moz-tree-image",
atom!(":-moz-tree-image"),
true);
pseudo_element!(":-moz-tree-cell-text",
atom!(":-moz-tree-cell-text"),
true);
pseudo_element!(":-moz-tree-checkbox",
atom!(":-moz-tree-checkbox"),
true);
pseudo_element!(":-moz-tree-progressmeter",
atom!(":-moz-tree-progressmeter"),
true);
pseudo_element!(":-moz-tree-drop-feedback",
atom!(":-moz-tree-drop-feedback"),
true);
pseudo_element!(":-moz-svg-marker-anon-child",
atom!(":-moz-svg-marker-anon-child"),
true);
pseudo_element!(":-moz-svg-outer-svg-anon-child",
atom!(":-moz-svg-outer-svg-anon-child"),
true);
pseudo_element!(":-moz-svg-foreign-content",
atom!(":-moz-svg-foreign-content"),
true);
pseudo_element!(":-moz-svg-text",
atom!(":-moz-svg-text"),
true);
}

799
components/style/gecko/generated/structs_debug.rs
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812
components/style/gecko/generated/structs_release.rs
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1
components/style/gecko/mod.rs
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@ -12,6 +12,7 @@ pub mod conversions;
pub mod data;
pub mod global_style_data;
pub mod media_queries;
pub mod pseudo_element;
pub mod restyle_damage;
pub mod rules;
pub mod selector_parser;

71
components/style/gecko/pseudo_element.rs Normal file
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@ -0,0 +1,71 @@
/* 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/. */
//! Gecko's definition of a pseudo-element.
//!
//! Note that a few autogenerated bits of this live in
//! `pseudo_element_definition.mako.rs`. If you touch that file, you probably
//! need to update the checked-in files for Servo.
use cssparser::ToCss;
use gecko_bindings::structs::CSSPseudoElementType;
use selector_parser::PseudoElementCascadeType;
use std::fmt;
use string_cache::Atom;
include!(concat!(env!("OUT_DIR"), "/gecko/pseudo_element_definition.rs"));
impl PseudoElement {
/// Returns the kind of cascade type that a given pseudo is going to use.
///
/// In Gecko we only compute ::before and ::after eagerly. We save the rules
/// for anonymous boxes separately, so we resolve them as precomputed
/// pseudos.
///
/// We resolve the others lazily, see `Servo_ResolvePseudoStyle`.
pub fn cascade_type(&self) -> PseudoElementCascadeType {
if self.is_eager() {
debug_assert!(!self.is_anon_box());
return PseudoElementCascadeType::Eager
}
if self.is_anon_box() {
return PseudoElementCascadeType::Precomputed
}
PseudoElementCascadeType::Lazy
}
/// Gets the canonical index of this eagerly-cascaded pseudo-element.
#[inline]
pub fn eager_index(&self) -> usize {
EAGER_PSEUDOS.iter().position(|p| p == self)
.expect("Not an eager pseudo")
}
/// Creates a pseudo-element from an eager index.
#[inline]
pub fn from_eager_index(i: usize) -> Self {
EAGER_PSEUDOS[i].clone()
}
/// Whether this pseudo-element is ::before or ::after.
#[inline]
pub fn is_before_or_after(&self) -> bool {
matches!(*self, PseudoElement::Before | PseudoElement::After)
}
/// Whether this pseudo-element is lazily-cascaded.
#[inline]
pub fn is_lazy(&self) -> bool {
!self.is_eager() && !self.is_precomputed()
}
}
impl ToCss for PseudoElement {
fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
dest.write_char(':')?;
dest.write_str(self.as_str())
}
}

128
components/style/gecko/pseudo_element_definition.mako.rs Normal file
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@ -0,0 +1,128 @@
/* 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/. */
/// Gecko's pseudo-element definition.
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub enum PseudoElement {
% for pseudo in PSEUDOS:
/// ${pseudo.value}
${pseudo.capitalized()},
% endfor
}
<% EAGER_PSEUDOS = ["Before", "After"] %>
/// The number of eager pseudo-elements.
pub const EAGER_PSEUDO_COUNT: usize = ${len(EAGER_PSEUDOS)};
/// The list of eager pseudos.
pub const EAGER_PSEUDOS: [PseudoElement; EAGER_PSEUDO_COUNT] = [
% for eager_pseudo_name in EAGER_PSEUDOS:
PseudoElement::${eager_pseudo_name},
% endfor
];
impl PseudoElement {
/// Executes a closure with each pseudo-element as an argument.
pub fn each<F>(mut fun: F)
where F: FnMut(Self),
{
% for pseudo in PSEUDOS:
fun(PseudoElement::${pseudo.capitalized()});
% endfor
}
/// Get the pseudo-element as an atom.
#[inline]
pub fn atom(&self) -> Atom {
match *self {
% for pseudo in PSEUDOS:
PseudoElement::${pseudo.capitalized()} => atom!("${pseudo.value}"),
% endfor
}
}
/// Whether this pseudo-element is an anonymous box.
#[inline]
fn is_anon_box(&self) -> bool {
match *self {
% for pseudo in PSEUDOS:
PseudoElement::${pseudo.capitalized()} => ${str(pseudo.is_anon_box()).lower()},
% endfor
}
}
/// Whether this pseudo-element is eagerly-cascaded.
#[inline]
pub fn is_eager(&self) -> bool {
matches!(*self,
${" | ".join(map(lambda name: "PseudoElement::{}".format(name), EAGER_PSEUDOS))})
}
/// Whether this pseudo-element is precomputed.
#[inline]
pub fn is_precomputed(&self) -> bool {
self.is_anon_box()
}
/// Construct a pseudo-element from a `CSSPseudoElementType`.
#[inline]
pub fn from_pseudo_type(type_: CSSPseudoElementType) -> Option<Self> {
match type_ {
% for pseudo in PSEUDOS:
% if not pseudo.is_anon_box():
CSSPseudoElementType::${pseudo.original_ident} => {
Some(PseudoElement::${pseudo.capitalized()})
},
% endif
% endfor
_ => None,
}
}
/// Construct a pseudo-element from an anonymous box `Atom`.
#[inline]
pub fn from_anon_box_atom(atom: &Atom) -> Option<Self> {
% for pseudo in PSEUDOS:
% if pseudo.is_anon_box():
if atom == &atom!("${pseudo.value}") {
return Some(PseudoElement::${pseudo.capitalized()});
}
% endif
% endfor
None
}
/// Constructs an atom from a string of text, and whether we're in a
/// user-agent stylesheet.
///
/// If we're not in a user-agent stylesheet, we will never parse anonymous
/// box pseudo-elements.
///
/// Returns `None` if the pseudo-element is not recognised.
#[inline]
pub fn from_slice(s: &str, in_ua_stylesheet: bool) -> Option<Self> {
use std::ascii::AsciiExt;
% for pseudo in PSEUDOS:
if !${str(pseudo.is_anon_box()).lower()} || in_ua_stylesheet {
if s.eq_ignore_ascii_case("${pseudo.value[1:]}") {
return Some(PseudoElement::${pseudo.capitalized()})
}
}
% endfor
None
}
/// Returns the pseudo-element's definition as a string, with only one colon
/// before it.
pub fn as_str(&self) -> &'static str {
match *self {
% for pseudo in PSEUDOS:
PseudoElement::${pseudo.capitalized()} => "${pseudo.value}",
% endfor
}
}
}

248
components/style/gecko/regen_atoms.py Executable file
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@ -0,0 +1,248 @@
#!/usr/bin/env python
# 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/.
import re
import os
import sys
from io import BytesIO
GECKO_DIR = os.path.dirname(__file__.replace('\\', '/'))
sys.path.insert(0, os.path.join(os.path.dirname(GECKO_DIR), "properties"))
import build
PRELUDE = """
/* 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/. */
/* Autogenerated file created by components/style/binding_tools/regen_atoms.py, DO NOT EDIT DIRECTLY */
"""[1:]
def gnu_symbolify(source, ident):
return "_ZN{}{}{}{}E".format(len(source.CLASS), source.CLASS, len(ident), ident)
def msvc64_symbolify(source, ident):
return "?{}@{}@@2PEAV{}@@EA".format(ident, source.CLASS, source.TYPE)
def msvc32_symbolify(source, ident):
# Prepend "\x01" to avoid LLVM prefixing the mangled name with "_".
# See https://github.com/rust-lang/rust/issues/36097
return "\\x01?{}@{}@@2PAV{}@@A".format(ident, source.CLASS, source.TYPE)
class GkAtomSource:
PATTERN = re.compile('^GK_ATOM\((.+),\s*"(.*)"\)')
FILE = "include/nsGkAtomList.h"
CLASS = "nsGkAtoms"
TYPE = "nsIAtom"
class CSSPseudoElementsAtomSource:
PATTERN = re.compile('^CSS_PSEUDO_ELEMENT\((.+),\s*"(.*)",')
FILE = "include/nsCSSPseudoElementList.h"
CLASS = "nsCSSPseudoElements"
# NB: nsICSSPseudoElement is effectively the same as a nsIAtom, but we need
# this for MSVC name mangling.
TYPE = "nsICSSPseudoElement"
class CSSAnonBoxesAtomSource:
PATTERN = re.compile('^(?:CSS_ANON_BOX|CSS_NON_INHERITING_ANON_BOX)\((.+),\s*"(.*)"(\,|\))')
FILE = "include/nsCSSAnonBoxList.h"
CLASS = "nsCSSAnonBoxes"
TYPE = "nsICSSAnonBoxPseudo"
SOURCES = [
GkAtomSource,
CSSPseudoElementsAtomSource,
CSSAnonBoxesAtomSource,
]
def map_atom(ident):
if ident in {"box", "loop", "match", "mod", "ref",
"self", "type", "use", "where", "in"}:
return ident + "_"
return ident
class Atom:
def __init__(self, source, ident, value):
self.ident = "{}_{}".format(source.CLASS, ident)
self.original_ident = ident
self.value = value
self.source = source
def cpp_class(self):
return self.source.CLASS
def gnu_symbol(self):
return gnu_symbolify(self.source, self.original_ident)
def msvc32_symbol(self):
return msvc32_symbolify(self.source, self.original_ident)
def msvc64_symbol(self):
return msvc64_symbolify(self.source, self.original_ident)
def type(self):
return self.source.TYPE
def capitalized(self):
return self.original_ident[0].upper() + self.original_ident[1:]
def is_anon_box(self):
return self.type() == "nsICSSAnonBoxPseudo"
def collect_atoms(objdir):
atoms = []
for source in SOURCES:
path = os.path.abspath(os.path.join(objdir, source.FILE))
print("cargo:rerun-if-changed={}".format(path))
with open(path) as f:
for line in f.readlines():
result = re.match(source.PATTERN, line)
if result:
atoms.append(Atom(source, result.group(1), result.group(2)))
return atoms
class FileAvoidWrite(BytesIO):
"""File-like object that buffers output and only writes if content changed."""
def __init__(self, filename):
BytesIO.__init__(self)
self.name = filename
def write(self, buf):
if isinstance(buf, unicode):
buf = buf.encode('utf-8')
BytesIO.write(self, buf)
def close(self):
buf = self.getvalue()
BytesIO.close(self)
try:
with open(self.name, 'rb') as f:
old_content = f.read()
if old_content == buf:
print("{} is not changed, skip".format(self.name))
return
except IOError:
pass
with open(self.name, 'wb') as f:
f.write(buf)
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
if not self.closed:
self.close()
IMPORTS = ("\nuse gecko_bindings::structs::nsIAtom;"
"\nuse string_cache::Atom;\n\n")
ATOM_TEMPLATE = (" #[link_name = \"{link_name}\"]\n"
" pub static {name}: *mut {type};")
UNSAFE_STATIC = ("#[inline(always)]\n"
"pub unsafe fn atom_from_static(ptr: *mut nsIAtom) -> Atom {\n"
" Atom::from_static(ptr)\n"
"}\n\n")
CFG_IF = '''
cfg_if! {{
if #[cfg(not(target_env = "msvc"))] {{
extern {{
{gnu}
}}
}} else if #[cfg(target_pointer_width = "64")] {{
extern {{
{msvc64}
}}
}} else {{
extern {{
{msvc32}
}}
}}
}}
'''
RULE_TEMPLATE = ('("{atom}") =>\n '
'{{ '
# FIXME(bholley): Uncomment this when rust 1.14 is released.
# See the comment in components/style/lib.rs.
# ' #[allow(unsafe_code)] #[allow(unused_unsafe)] '
'unsafe {{ $crate::string_cache::atom_macro::atom_from_static'
'($crate::string_cache::atom_macro::{name} as *mut _) }}'
' }};')
MACRO = '''
#[macro_export]
macro_rules! atom {{
{}
}}
'''
def write_atom_macro(atoms, file_name):
def get_symbols(func):
return '\n'.join([ATOM_TEMPLATE.format(name=atom.ident,
link_name=func(atom),
type=atom.type()) for atom in atoms])
with FileAvoidWrite(file_name) as f:
f.write(PRELUDE)
f.write(IMPORTS)
for source in SOURCES:
if source.TYPE != "nsIAtom":
f.write("pub enum {} {{}}\n\n".format(source.TYPE))
f.write(UNSAFE_STATIC)
gnu_symbols = get_symbols(Atom.gnu_symbol)
msvc32_symbols = get_symbols(Atom.msvc32_symbol)
msvc64_symbols = get_symbols(Atom.msvc64_symbol)
f.write(CFG_IF.format(gnu=gnu_symbols, msvc32=msvc32_symbols, msvc64=msvc64_symbols))
macro_rules = [RULE_TEMPLATE.format(atom=atom.value, name=atom.ident) for atom in atoms]
f.write(MACRO.format('\n'.join(macro_rules)))
def write_pseudo_elements(atoms, target_filename):
pseudos = []
for atom in atoms:
if atom.type() == "nsICSSPseudoElement" or atom.type() == "nsICSSAnonBoxPseudo":
pseudos.append(atom)
pseudo_definition_template = os.path.join(GECKO_DIR, "pseudo_element_definition.mako.rs")
print("cargo:rerun-if-changed={}".format(pseudo_definition_template))
contents = build.render(pseudo_definition_template, PSEUDOS=pseudos)
with FileAvoidWrite(target_filename) as f:
f.write(contents)
def generate_atoms(dist, out):
atoms = collect_atoms(dist)
write_atom_macro(atoms, os.path.join(out, "atom_macro.rs"))
write_pseudo_elements(atoms, os.path.join(out, "pseudo_element_definition.rs"))
if __name__ == "__main__":
if len(sys.argv) != 3:
print("Usage: {} dist out".format(sys.argv[0]))
exit(2)
generate_atoms(sys.argv[1], sys.argv[2])

214
components/style/gecko/selector_parser.rs
View file

@ -8,213 +8,16 @@ use cssparser::{Parser, ToCss};
use element_state::{IN_ACTIVE_STATE, IN_FOCUS_STATE, IN_HOVER_STATE};
use element_state::ElementState;
use gecko_bindings::structs::CSSPseudoClassType;
use gecko_bindings::structs::nsIAtom;
use selector_parser::{SelectorParser, PseudoElementCascadeType};
use selectors::parser::{ComplexSelector, SelectorMethods};
use selectors::visitor::SelectorVisitor;
use std::borrow::Cow;
use std::fmt;
use std::ptr;
use string_cache::{Atom, Namespace, WeakAtom, WeakNamespace};
pub use gecko::pseudo_element::{PseudoElement, EAGER_PSEUDOS, EAGER_PSEUDO_COUNT};
pub use gecko::snapshot::SnapshotMap;
/// A representation of a CSS pseudo-element.
///
/// In Gecko, we represent pseudo-elements as plain `Atom`s.
///
/// The boolean field represents whether this element is an anonymous box. This
/// is just for convenience, instead of recomputing it.
///
/// Also, note that the `Atom` member is always a static atom, so if space is a
/// concern, we can use the raw pointer and use the lower bit to represent it
/// without space overhead.
///
/// FIXME(emilio): we know all these atoms are static. Patches are starting to
/// pile up, but a further potential optimisation is generating bindings without
/// `-no-gen-bitfield-methods` (that was removed to compile on stable, but it no
/// longer depends on it), and using the raw *mut nsIAtom (properly asserting
/// we're a static atom).
///
/// This should allow us to avoid random FFI overhead when cloning/dropping
/// pseudos.
///
/// Also, we can further optimize PartialEq and hash comparing/hashing only the
/// atoms.
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub struct PseudoElement(Atom, bool);
/// List of eager pseudos. Keep this in sync with the count below.
macro_rules! each_eager_pseudo {
($macro_name:ident, $atom_macro:ident) => {
$macro_name!($atom_macro!(":after"), 0);
$macro_name!($atom_macro!(":before"), 1);
}
}
/// The number of eager pseudo-elements (just ::before and ::after).
pub const EAGER_PSEUDO_COUNT: usize = 2;
impl PseudoElement {
/// Returns the kind of cascade type that a given pseudo is going to use.
///
/// In Gecko we only compute ::before and ::after eagerly. We save the rules
/// for anonymous boxes separately, so we resolve them as precomputed
/// pseudos.
///
/// We resolve the others lazily, see `Servo_ResolvePseudoStyle`.
pub fn cascade_type(&self) -> PseudoElementCascadeType {
if self.is_eager() {
debug_assert!(!self.is_anon_box());
return PseudoElementCascadeType::Eager
}
if self.is_anon_box() {
return PseudoElementCascadeType::Precomputed
}
PseudoElementCascadeType::Lazy
}
/// Gets the canonical index of this eagerly-cascaded pseudo-element.
#[inline]
pub fn eager_index(&self) -> usize {
macro_rules! case {
($atom:expr, $idx:expr) => { if *self.as_atom() == $atom { return $idx; } }
}
each_eager_pseudo!(case, atom);
panic!("Not eager")
}
/// Creates a pseudo-element from an eager index.
#[inline]
pub fn from_eager_index(i: usize) -> Self {
macro_rules! case {
($atom:expr, $idx:expr) => { if i == $idx { return PseudoElement($atom, false); } }
}
each_eager_pseudo!(case, atom);
panic!("Not eager")
}
/// Get the pseudo-element as an atom.
#[inline]
pub fn as_atom(&self) -> &Atom {
&self.0
}
/// Whether this pseudo-element is an anonymous box.
#[inline]
fn is_anon_box(&self) -> bool {
self.1
}
/// Whether this pseudo-element is ::before or ::after.
#[inline]
pub fn is_before_or_after(&self) -> bool {
*self.as_atom() == atom!(":before") ||
*self.as_atom() == atom!(":after")
}
/// Whether this pseudo-element is eagerly-cascaded.
#[inline]
pub fn is_eager(&self) -> bool {
macro_rules! case {
($atom:expr, $idx:expr) => { if *self.as_atom() == $atom { return true; } }
}
each_eager_pseudo!(case, atom);
return false;
}
/// Whether this pseudo-element is lazily-cascaded.
#[inline]
pub fn is_lazy(&self) -> bool {
!self.is_eager() && !self.is_precomputed()
}
/// Whether this pseudo-element is precomputed.
#[inline]
pub fn is_precomputed(&self) -> bool {
self.is_anon_box()
}
/// Construct a pseudo-element from an `Atom`, receiving whether it is also
/// an anonymous box, and don't check it on release builds.
///
/// On debug builds we assert it's the result we expect.
#[inline]
pub fn from_atom_unchecked(atom: Atom, is_anon_box: bool) -> Self {
if cfg!(debug_assertions) {
// Do the check on debug regardless.
match Self::from_atom(&*atom, true) {
Some(pseudo) => {
assert_eq!(pseudo.is_anon_box(), is_anon_box);
return pseudo;
}
None => panic!("Unknown pseudo: {:?}", atom),
}
}
PseudoElement(atom, is_anon_box)
}
#[inline]
fn from_atom(atom: &WeakAtom, _in_ua: bool) -> Option<Self> {
macro_rules! pseudo_element {
($pseudo_str_with_colon:expr, $atom:expr, $is_anon_box:expr) => {{
if atom == &*$atom {
return Some(PseudoElement($atom, $is_anon_box));
}
}}
}
include!(concat!(env!("OUT_DIR"), "/gecko/pseudo_element_helper.rs"));
None
}
/// Constructs an atom from a string of text, and whether we're in a
/// user-agent stylesheet.
///
/// If we're not in a user-agent stylesheet, we will never parse anonymous
/// box pseudo-elements.
///
/// Returns `None` if the pseudo-element is not recognised.
#[inline]
fn from_slice(s: &str, in_ua_stylesheet: bool) -> Option<Self> {
use std::ascii::AsciiExt;
macro_rules! pseudo_element {
($pseudo_str_with_colon:expr, $atom:expr, $is_anon_box:expr) => {{
if !$is_anon_box || in_ua_stylesheet {
if s.eq_ignore_ascii_case(&$pseudo_str_with_colon[1..]) {
return Some(PseudoElement($atom, $is_anon_box))
}
}
}}
}
include!(concat!(env!("OUT_DIR"), "/gecko/pseudo_element_helper.rs"));
None
}
/// Returns null or nsIAtom pointer corresponding to a given PseudoElement.
#[inline]
pub fn ns_atom_or_null_from_opt(pseudo: Option<&PseudoElement>) -> *mut nsIAtom {
pseudo.map(|p| p.as_atom().as_ptr()).unwrap_or(ptr::null_mut())
}
}
impl ToCss for PseudoElement {
fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
// FIXME: why does the atom contain one colon? Pseudo-element has two
debug_assert!(self.0.as_slice().starts_with(&[b':' as u16]) &&
!self.0.as_slice().starts_with(&[b':' as u16, b':' as u16]));
try!(dest.write_char(':'));
write!(dest, "{}", self.0)
}
}
bitflags! {
flags NonTSPseudoClassFlag: u8 {
// See NonTSPseudoClass::is_internal()
@ -561,25 +364,18 @@ impl SelectorImpl {
pub fn each_eagerly_cascaded_pseudo_element<F>(mut fun: F)
where F: FnMut(PseudoElement),
{
macro_rules! case {
($atom:expr, $idx:expr) => { fun(PseudoElement($atom, false)); }
for pseudo in &EAGER_PSEUDOS {
fun(pseudo.clone())
}
each_eager_pseudo!(case, atom);
}
#[inline]
/// Executes a function for each pseudo-element.
pub fn each_pseudo_element<F>(mut fun: F)
pub fn each_pseudo_element<F>(fun: F)
where F: FnMut(PseudoElement),
{
macro_rules! pseudo_element {
($pseudo_str_with_colon:expr, $atom:expr, $is_anon_box:expr) => {{
fun(PseudoElement($atom, $is_anon_box));
}}
}
include!(concat!(env!("OUT_DIR"), "/gecko/pseudo_element_helper.rs"));
PseudoElement::each(fun)
}
#[inline]

13
components/style/gecko/wrapper.rs
View file

@ -627,7 +627,8 @@ impl<'le> TElement for GeckoElement<'le> {
_existing_values: &'a Arc<ComputedValues>,
pseudo: Option<&PseudoElement>)
-> Option<&'a nsStyleContext> {
let atom_ptr = PseudoElement::ns_atom_or_null_from_opt(pseudo);
// TODO(emilio): Migrate this to CSSPseudoElementType.
let atom_ptr = pseudo.map_or(ptr::null_mut(), |p| p.atom().as_ptr());
unsafe {
let context_ptr = Gecko_GetStyleContext(self.0, atom_ptr);
context_ptr.as_ref()
@ -699,15 +700,9 @@ impl<'le> TElement for GeckoElement<'le> {
return None;
}
let maybe_atom =
let pseudo_type =
unsafe { bindings::Gecko_GetImplementedPseudo(self.0) };
if maybe_atom.is_null() {
return None;
}
let atom = Atom::from(maybe_atom);
Some(PseudoElement::from_atom_unchecked(atom, /* anon_box = */ false))
PseudoElement::from_pseudo_type(pseudo_type)
}
fn store_children_to_process(&self, _: isize) {