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Treat top-level number in calc() invalid

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Currently, CalcLengthOrPercentage doesn't actually keep the number
value, so if we don't treat it invalid, we can end up generating empty
`calc()` value when one contains top-level numbers (e.g. `calc(1)`),
which would violate assertion elsewhere that `calc` must not be empty.
This commit is contained in:
Xidorn Quan 2016-11-30 18:31:32 +11:00 • committed by Xidorn Quan
parent f159b5cb10
commit 6fec4d7645
2 changed files with 24 additions and 4 deletions
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7
components/style/values/specified/length.rs
View file

@ -554,8 +554,8 @@ impl CalcLengthOrPercentage {
CalcLengthOrPercentage::parse(input, CalcUnit::LengthOrPercentage)
}
fn parse(input: &mut Parser,
expected_unit: CalcUnit) -> Result<CalcLengthOrPercentage, ()> {
pub fn parse(input: &mut Parser,
expected_unit: CalcUnit) -> Result<CalcLengthOrPercentage, ()> {
let ast = try!(CalcLengthOrPercentage::parse_sum(input, expected_unit));
let mut simplified = Vec::new();
@ -576,7 +576,6 @@ impl CalcLengthOrPercentage {
let mut ch = None;
let mut rem = None;
let mut percentage = None;
let mut number = None;
for value in simplified {
match value {
@ -606,7 +605,7 @@ impl CalcLengthOrPercentage {
FontRelativeLength::Rem(val) =>
rem = Some(rem.unwrap_or(0.) + val),
},
SimplifiedValueNode::Number(val) => number = Some(number.unwrap_or(0.) + val),
// TODO Add support for top level number in calc(). See servo/servo#14421.
_ => return Err(()),
}
}