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gecko-dev/servo/ports/geckolib/error_reporter.rs

331 строка
14 KiB
Rust
Исходник Ответственный История

/* 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/. */
//! Wrapper around Gecko's CSS error reporting mechanism.
#![allow(unsafe_code)]
use cssparser::{Parser, SourcePosition, ParseError as CssParseError, Token, BasicParseError};
use cssparser::CowRcStr;
use selectors::parser::SelectorParseError;
use std::ptr;
use style::error_reporting::{ParseErrorReporter, ContextualParseError};
use style::gecko_bindings::bindings::{Gecko_CreateCSSErrorReporter, Gecko_DestroyCSSErrorReporter};
use style::gecko_bindings::bindings::Gecko_ReportUnexpectedCSSError;
use style::gecko_bindings::structs::{Loader, ServoStyleSheet, nsIURI};
use style::gecko_bindings::structs::ErrorReporter as GeckoErrorReporter;
use style::gecko_bindings::structs::URLExtraData as RawUrlExtraData;
use style::gecko_bindings::sugar::refptr::RefPtr;
use style::stylesheets::UrlExtraData;
use style_traits::{ParseError, StyleParseError, PropertyDeclarationParseError};
/// Wrapper around an instance of Gecko's CSS error reporter.
pub struct ErrorReporter(*mut GeckoErrorReporter);
impl ErrorReporter {
/// Create a new instance of the Gecko error reporter.
pub fn new(sheet: *mut ServoStyleSheet,
loader: *mut Loader,
url: *mut RawUrlExtraData) -> ErrorReporter {
unsafe {
let url = RefPtr::from_ptr_ref(&url);
ErrorReporter(Gecko_CreateCSSErrorReporter(sheet, loader, url.mBaseURI.raw::<nsIURI>()))
}
}
}
impl Drop for ErrorReporter {
fn drop(&mut self) {
unsafe {
Gecko_DestroyCSSErrorReporter(self.0);
}
}
}
enum ErrorString<'a> {
Snippet(CowRcStr<'a>),
Ident(CowRcStr<'a>),
UnexpectedToken(Token<'a>),
}
impl<'a> ErrorString<'a> {
fn into_str(self) -> String {
match self {
ErrorString::Snippet(s) => s.as_ref().to_owned(),
ErrorString::Ident(i) => escape_css_ident(&i),
ErrorString::UnexpectedToken(t) => token_to_str(t),
}
}
}
// This is identical to the behaviour of cssparser::serialize_identifier, except that
// it uses numerical escapes for a larger set of characters.
fn escape_css_ident(ident: &str) -> String {
// The relevant parts of the CSS grammar are:
// ident ([-]?{nmstart}|[-][-]){nmchar}*
// nmstart [_a-z]|{nonascii}|{escape}
// nmchar [_a-z0-9-]|{nonascii}|{escape}
// nonascii [^\0-\177]
// escape {unicode}|\\[^\n\r\f0-9a-f]
// unicode \\[0-9a-f]{1,6}(\r\n|[ \n\r\t\f])?
// from http://www.w3.org/TR/CSS21/syndata.html#tokenization but
// modified for idents by
// http://dev.w3.org/csswg/cssom/#serialize-an-identifier and
// http://dev.w3.org/csswg/css-syntax/#would-start-an-identifier
if ident.is_empty() {
return ident.into()
}
let mut escaped = String::new();
// A leading dash does not need to be escaped as long as it is not the
// *only* character in the identifier.
let mut iter = ident.chars().peekable();
if iter.peek() == Some(&'-') {
if ident.len() == 1 {
return "\\-".into();
}
escaped.push('-');
// Skip the first character.
let _ = iter.next();
}
// Escape a digit at the start (including after a dash),
// numerically. If we didn't escape it numerically, it would get
// interpreted as a numeric escape for the wrong character.
if iter.peek().map_or(false, |&c| '0' <= c && c <= '9') {
let ch = iter.next().unwrap();
escaped.push_str(&format!("\\{:x} ", ch as u32));
}
while let Some(ch) = iter.next() {
if ch == '\0' {
escaped.push_str("\u{FFFD}");
} else if ch < (0x20 as char) || (0x7f as char <= ch && ch < (0xA0 as char)) {
// Escape U+0000 through U+001F and U+007F through U+009F numerically.
escaped.push_str(&format!("\\{:x} ", ch as u32));
} else {
// Escape ASCII non-identifier printables as a backslash plus
// the character.
if (ch < (0x7F as char)) &&
ch != '_' && ch != '-' &&
(ch < '0' || '9' < ch) &&
(ch < 'A' || 'Z' < ch) &&
(ch < 'a' || 'z' < ch)
{
escaped.push('\\');
}
escaped.push(ch);
}
}
escaped
}
// This is identical to the behaviour of cssparser::CssStringWriter, except that
// the characters between 0x7F and 0xA0 as numerically escaped as well.
fn escape_css_string(s: &str) -> String {
let mut escaped = String::new();
for ch in s.chars() {
if ch < ' ' || (ch >= (0x7F as char) && ch < (0xA0 as char)) {
escaped.push_str(&format!("\\{:x} ", ch as u32));
} else {
if ch == '"' || ch == '\'' || ch == '\\' {
// Escape backslash and quote characters symbolically.
// It's not technically necessary to escape the quote
// character that isn't being used to delimit the string,
// but we do it anyway because that makes testing simpler.
escaped.push('\\');
}
escaped.push(ch);
}
}
escaped
}
fn token_to_str<'a>(t: Token<'a>) -> String {
match t {
Token::Ident(i) => escape_css_ident(&i),
Token::AtKeyword(kw) => format!("@{}", escape_css_ident(&kw)),
Token::Hash(h) | Token::IDHash(h) => format!("#{}", escape_css_ident(&h)),
Token::QuotedString(s) => format!("'{}'", escape_css_string(&s)),
Token::UnquotedUrl(u) => format!("'{}'", escape_css_string(&u)),
Token::Delim(d) => d.to_string(),
Token::Number { int_value: Some(i), .. } => i.to_string(),
Token::Number { value, .. } => value.to_string(),
Token::Percentage { int_value: Some(i), .. } => i.to_string(),
Token::Percentage { unit_value, .. } => unit_value.to_string(),
Token::Dimension { int_value: Some(i), ref unit, .. } =>
format!("{}{}", i.to_string(), escape_css_ident(&unit.to_string())),
Token::Dimension { value, ref unit, .. } =>
format!("{}{}", value.to_string(), escape_css_ident(&unit.to_string())),
Token::WhiteSpace(_) => "whitespace".into(),
Token::Comment(_) => "comment".into(),
Token::Colon => ":".into(),
Token::Semicolon => ";".into(),
Token::Comma => ",".into(),
Token::IncludeMatch => "~=".into(),
Token::DashMatch => "|=".into(),
Token::PrefixMatch => "^=".into(),
Token::SuffixMatch => "$=".into(),
Token::SubstringMatch => "*=".into(),
Token::Column => "||".into(),
Token::CDO => "<!--".into(),
Token::CDC => "-->".into(),
Token::Function(f) => format!("{}(", escape_css_ident(&f)),
Token::ParenthesisBlock => "(".into(),
Token::SquareBracketBlock => "[".into(),
Token::CurlyBracketBlock => "{".into(),
Token::BadUrl(url) => format!("url('{}", escape_css_string(&url)).into(),
Token::BadString(s) => format!("'{}", escape_css_string(&s)).into(),
Token::CloseParenthesis => "unmatched close parenthesis".into(),
Token::CloseSquareBracket => "unmatched close square bracket".into(),
Token::CloseCurlyBracket => "unmatched close curly bracket".into(),
}
}
enum Action {
Nothing,
Skip,
Drop,
}
trait ErrorHelpers<'a> {
fn error_data(self) -> (CowRcStr<'a>, ParseError<'a>);
fn error_param(self) -> ErrorString<'a>;
fn to_gecko_message(&self) -> (&'static [u8], Action);
}
impl<'a> ErrorHelpers<'a> for ContextualParseError<'a> {
fn error_data(self) -> (CowRcStr<'a>, ParseError<'a>) {
match self {
ContextualParseError::UnsupportedPropertyDeclaration(s, err) |
ContextualParseError::UnsupportedFontFaceDescriptor(s, err) |
ContextualParseError::InvalidKeyframeRule(s, err) |
ContextualParseError::UnsupportedKeyframePropertyDeclaration(s, err) |
ContextualParseError::InvalidRule(s, err) |
ContextualParseError::UnsupportedRule(s, err) |
ContextualParseError::UnsupportedViewportDescriptorDeclaration(s, err) |
ContextualParseError::UnsupportedCounterStyleDescriptorDeclaration(s, err) =>
(s.into(), err),
ContextualParseError::InvalidCounterStyleWithoutSymbols(s) |
ContextualParseError::InvalidCounterStyleNotEnoughSymbols(s) =>
(s.into(), StyleParseError::UnspecifiedError.into()),
ContextualParseError::InvalidCounterStyleWithoutAdditiveSymbols |
ContextualParseError::InvalidCounterStyleExtendsWithSymbols |
ContextualParseError::InvalidCounterStyleExtendsWithAdditiveSymbols =>
("".into(), StyleParseError::UnspecifiedError.into())
}
}
fn error_param(self) -> ErrorString<'a> {
match self.error_data() {
(_, CssParseError::Basic(BasicParseError::UnexpectedToken(t))) =>
ErrorString::UnexpectedToken(t),
(_, CssParseError::Basic(BasicParseError::AtRuleInvalid(i))) =>
ErrorString::Snippet(format!("@{}", escape_css_ident(&i)).into()),
(_, CssParseError::Custom(SelectorParseError::Custom(
StyleParseError::PropertyDeclaration(
PropertyDeclarationParseError::InvalidValue(property))))) =>
ErrorString::Snippet(property),
(_, CssParseError::Custom(SelectorParseError::UnexpectedIdent(ident))) =>
ErrorString::Ident(ident),
(_, CssParseError::Custom(SelectorParseError::ExpectedNamespace(namespace))) =>
ErrorString::Ident(namespace),
(_, CssParseError::Custom(SelectorParseError::Custom(
StyleParseError::PropertyDeclaration(
PropertyDeclarationParseError::UnknownProperty(property))))) =>
ErrorString::Ident(property),
(_, CssParseError::Custom(SelectorParseError::Custom(
StyleParseError::UnexpectedTokenWithinNamespace(token)))) =>
ErrorString::UnexpectedToken(token),
(s, _) => ErrorString::Snippet(s)
}
}
fn to_gecko_message(&self) -> (&'static [u8], Action) {
match *self {
ContextualParseError::UnsupportedPropertyDeclaration(
_, CssParseError::Basic(BasicParseError::UnexpectedToken(_))) |
ContextualParseError::UnsupportedPropertyDeclaration(
_, CssParseError::Basic(BasicParseError::AtRuleInvalid(_))) =>
(b"PEParseDeclarationDeclExpected\0", Action::Skip),
ContextualParseError::UnsupportedPropertyDeclaration(
_, CssParseError::Custom(SelectorParseError::Custom(
StyleParseError::PropertyDeclaration(
PropertyDeclarationParseError::InvalidValue(_))))) =>
(b"PEValueParsingError\0", Action::Drop),
ContextualParseError::UnsupportedPropertyDeclaration(..) =>
(b"PEUnknownProperty\0", Action::Drop),
ContextualParseError::UnsupportedFontFaceDescriptor(..) =>
(b"PEUnknwnFontDesc\0", Action::Skip),
ContextualParseError::InvalidKeyframeRule(..) =>
(b"PEKeyframeBadName\0", Action::Nothing),
ContextualParseError::UnsupportedKeyframePropertyDeclaration(..) =>
(b"PEBadSelectorKeyframeRuleIgnored\0", Action::Nothing),
ContextualParseError::InvalidRule(
_, CssParseError::Custom(SelectorParseError::ExpectedNamespace(_))) =>
(b"PEUnknownNamespacePrefix\0", Action::Nothing),
ContextualParseError::InvalidRule(
_, CssParseError::Custom(SelectorParseError::Custom(
StyleParseError::UnexpectedTokenWithinNamespace(_)))) =>
(b"PEAtNSUnexpected\0", Action::Nothing),
ContextualParseError::InvalidRule(..) =>
(b"PEBadSelectorRSIgnored\0", Action::Nothing),
ContextualParseError::UnsupportedRule(..) =>
(b"PEDeclDropped\0", Action::Nothing),
ContextualParseError::UnsupportedViewportDescriptorDeclaration(..) |
ContextualParseError::UnsupportedCounterStyleDescriptorDeclaration(..) |
ContextualParseError::InvalidCounterStyleWithoutSymbols(..) |
ContextualParseError::InvalidCounterStyleNotEnoughSymbols(..) |
ContextualParseError::InvalidCounterStyleWithoutAdditiveSymbols |
ContextualParseError::InvalidCounterStyleExtendsWithSymbols |
ContextualParseError::InvalidCounterStyleExtendsWithAdditiveSymbols =>
(b"PEUnknownAtRule\0", Action::Skip),
}
}
}
impl ParseErrorReporter for ErrorReporter {
fn report_error<'a>(&self,
input: &mut Parser,
position: SourcePosition,
error: ContextualParseError<'a>,
url: &UrlExtraData,
line_number_offset: u64) {
let location = input.source_location(position);
let line_number = location.line + line_number_offset as u32;
let (name, action) = error.to_gecko_message();
let followup = match action {
Action::Nothing => ptr::null(),
Action::Skip => b"PEDeclSkipped\0".as_ptr(),
Action::Drop => b"PEDeclDropped\0".as_ptr(),
};
let param = error.error_param().into_str();
// The CSS source text is unused and will be removed in bug 1381188.
let source = "";
unsafe {
Gecko_ReportUnexpectedCSSError(self.0,
name.as_ptr() as *const _,
param.as_ptr() as *const _,
param.len() as u32,
source.as_ptr() as *const _,
source.len() as u32,
line_number as u32,
location.column as u32,
url.mBaseURI.raw::<nsIURI>(),
followup as *const _);
}
}
}
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