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document_condition.rs
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document_condition.rs
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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 http://mozilla.org/MPL/2.0/. */
//! [@document rules](https://www.w3.org/TR/2012/WD-css3-conditional-20120911/#at-document)
//! initially in CSS Conditional Rules Module Level 3, @document has been postponed to the level 4.
//! We implement the prefixed `@-moz-document`.
use cssparser::{Parser, Token, serialize_string};
#[cfg(feature = "gecko")]
use gecko_bindings::bindings::Gecko_DocumentRule_UseForPresentation;
#[cfg(feature = "gecko")]
use gecko_bindings::structs::URLMatchingFunction as GeckoUrlMatchingFunction;
use media_queries::Device;
#[cfg(feature = "gecko")]
use nsstring::nsCString;
use parser::{Parse, ParserContext};
use std::fmt;
use style_traits::ToCss;
use values::specified::url::SpecifiedUrl;
/// A URL matching function for a `@document` rule's condition.
#[derive(Debug)]
pub enum UrlMatchingFunction {
/// Exact URL matching function. It evaluates to true whenever the
/// URL of the document being styled is exactly the URL given.
Url(SpecifiedUrl),
/// URL prefix matching function. It evaluates to true whenever the
/// URL of the document being styled has the argument to the
/// function as an initial substring (which is true when the two
/// strings are equal). When the argument is the empty string,
/// it evaluates to true for all documents.
UrlPrefix(String),
/// Domain matching function. It evaluates to true whenever the URL
/// of the document being styled has a host subcomponent and that
/// host subcomponent is exactly the argument to the ‘domain()’
/// function or a final substring of the host component is a
/// period (U+002E) immediately followed by the argument to the
/// ‘domain()’ function.
Domain(String),
/// Regular expression matching function. It evaluates to true
/// whenever the regular expression matches the entirety of the URL
/// of the document being styled.
RegExp(String),
}
macro_rules! parse_quoted_or_unquoted_string {
($input:ident, $url_matching_function:expr) => {
$input.parse_nested_block(|input| {
let start = input.position();
input.parse_entirely(|input| {
match input.next() {
Ok(Token::QuotedString(value)) =>
Ok($url_matching_function(value.into_owned())),
_ => Err(()),
}
}).or_else(|_| {
while let Ok(_) = input.next() {}
Ok($url_matching_function(input.slice_from(start).to_string()))
})
})
}
}
impl UrlMatchingFunction {
/// Parse a URL matching function for a`@document` rule's condition.
pub fn parse(context: &ParserContext, input: &mut Parser)
-> Result<UrlMatchingFunction, ()> {
if input.try(|input| input.expect_function_matching("url-prefix")).is_ok() {
parse_quoted_or_unquoted_string!(input, UrlMatchingFunction::UrlPrefix)
} else if input.try(|input| input.expect_function_matching("domain")).is_ok() {
parse_quoted_or_unquoted_string!(input, UrlMatchingFunction::Domain)
} else if input.try(|input| input.expect_function_matching("regexp")).is_ok() {
input.parse_nested_block(|input| {
Ok(UrlMatchingFunction::RegExp(input.expect_string()?.into_owned()))
})
} else if let Ok(url) = input.try(|input| SpecifiedUrl::parse(context, input)) {
Ok(UrlMatchingFunction::Url(url))
} else {
Err(())
}
}
#[cfg(feature = "gecko")]
/// Evaluate a URL matching function.
pub fn evaluate(&self, device: &Device) -> bool {
let func = match *self {
UrlMatchingFunction::Url(_) => GeckoUrlMatchingFunction::eURL,
UrlMatchingFunction::UrlPrefix(_) => GeckoUrlMatchingFunction::eURLPrefix,
UrlMatchingFunction::Domain(_) => GeckoUrlMatchingFunction::eDomain,
UrlMatchingFunction::RegExp(_) => GeckoUrlMatchingFunction::eRegExp,
};
let pattern = nsCString::from(match *self {
UrlMatchingFunction::Url(ref url) => url.as_str(),
UrlMatchingFunction::UrlPrefix(ref pat) |
UrlMatchingFunction::Domain(ref pat) |
UrlMatchingFunction::RegExp(ref pat) => pat,
});
unsafe {
Gecko_DocumentRule_UseForPresentation(&*device.pres_context, &*pattern, func)
}
}
#[cfg(not(feature = "gecko"))]
/// Evaluate a URL matching function.
pub fn evaluate(&self, _: &Device) -> bool {
false
}
}
impl ToCss for UrlMatchingFunction {
fn to_css<W>(&self, dest: &mut W) -> fmt::Result
where W: fmt::Write {
match *self {
UrlMatchingFunction::Url(ref url) => {
url.to_css(dest)
},
UrlMatchingFunction::UrlPrefix(ref url_prefix) => {
dest.write_str("url-prefix(")?;
serialize_string(url_prefix, dest)?;
dest.write_str(")")
},
UrlMatchingFunction::Domain(ref domain) => {
dest.write_str("domain(")?;
serialize_string(domain, dest)?;
dest.write_str(")")
},
UrlMatchingFunction::RegExp(ref regex) => {
dest.write_str("regexp(")?;
serialize_string(regex, dest)?;
dest.write_str(")")
},
}
}
}
/// A `@document` rule's condition.
///
/// https://www.w3.org/TR/2012/WD-css3-conditional-20120911/#at-document
///
/// The `@document` rule's condition is written as a comma-separated list of
/// URL matching functions, and the condition evaluates to true whenever any
/// one of those functions evaluates to true.
#[derive(Debug)]
pub struct DocumentCondition(Vec<UrlMatchingFunction>);
impl DocumentCondition {
/// Parse a document condition.
pub fn parse(context: &ParserContext, input: &mut Parser)
-> Result<Self, ()> {
input.parse_comma_separated(|input| UrlMatchingFunction::parse(context, input))
.map(DocumentCondition)
}
/// Evaluate a document condition.
pub fn evaluate(&self, device: &Device) -> bool {
self.0.iter().any(|ref url_matching_function|
url_matching_function.evaluate(device)
)
}
}
impl ToCss for DocumentCondition {
fn to_css<W>(&self, dest: &mut W) -> fmt::Result
where W: fmt::Write {
let mut iter = self.0.iter();
let first = iter.next()
.expect("Empty DocumentCondition, should contain at least one URL matching function");
first.to_css(dest)?;
for url_matching_function in iter {
dest.write_str(", ")?;
url_matching_function.to_css(dest)?;
}
Ok(())
}
}