Mirrors/servo
1
0
Fork 0
mirror of https://github.com/servo/servo.git synced 2025-06-24 09:04:33 +01:00
Code Issues Projects Releases Packages Wiki Activity

Add allow_empty to vector_longhand

Browse source
This commit is contained in:
Manish Goregaokar 2016-07-15 14:42:08 +05:30
parent 34c82d6e78
commit b6edae2f5e
No known key found for this signature in database
GPG key ID: 3BBF4D3E2EF79F98
1 changed files with 38 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

52
components/style/properties/helpers.mako.rs
View file

@ -41,11 +41,11 @@
to True for cases where Servo takes a single value
and Stylo supports vector values.
If the computed value is the same as the specified value,
setting computed_is_specified to True will introduce additional
optimizations
Setting allow_empty to False allows for cases where the vector
is empty. The grammar for these is usually "none | <thing> [ , <thing> ]*".
We assume that the default/initial value is an empty vector for these.
</%doc>
<%def name="vector_longhand(name, gecko_only=False, **kwargs)">
<%def name="vector_longhand(name, gecko_only=False, allow_empty=False, **kwargs)">
<%call expr="longhand(name, **kwargs)">
% if product == "gecko" or not gecko_only:
use cssparser::ToCss;
@ -68,10 +68,15 @@
impl ToCss for computed_value::T {
fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
if !self.0.is_empty() {
try!(self.0[0].to_css(dest));
let mut iter = self.0.iter();
if let Some(val) = iter.next() {
try!(val.to_css(dest));
} else {
% if allow_empty:
try!(dest.write_str("none"));
% endif
}
for i in self.0.iter().skip(1) {
for i in iter {
try!(dest.write_str(", "));
try!(i.to_css(dest));
}
@ -85,10 +90,15 @@
impl ToCss for SpecifiedValue {
fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
if !self.0.is_empty() {
try!(self.0[0].to_css(dest))
let mut iter = self.0.iter();
if let Some(val) = iter.next() {
try!(val.to_css(dest));
} else {
% if allow_empty:
try!(dest.write_str("none"));
% endif
}
for i in self.0.iter().skip(1) {
for i in iter {
try!(dest.write_str(", "));
try!(i.to_css(dest));
}
@ -96,12 +106,26 @@
}
}
pub fn get_initial_value() -> computed_value::T {
computed_value::T(vec![single_value::get_initial_value()])
% if allow_empty:
computed_value::T(vec![])
% else:
computed_value::T(vec![single_value::get_initial_value()])
% endif
}
pub fn parse(context: &ParserContext, input: &mut Parser) -> Result<SpecifiedValue, ()> {
input.parse_comma_separated(|parser| {
single_value::parse(context, parser)
}).map(|ok| SpecifiedValue(ok))
% if allow_empty:
if input.try(|input| input.expect_ident_matching("none")).is_ok() {
Ok(SpecifiedValue(Vec::new()))
} else {
input.parse_comma_separated(|parser| {
single_value::parse(context, parser)
}).map(SpecifiedValue)
}
% else:
input.parse_comma_separated(|parser| {
single_value::parse(context, parser)
}).map(SpecifiedValue)
% endif
}
impl ToComputedValue for SpecifiedValue {
type ComputedValue = computed_value::T;