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Fix overflow in ::nth-child()

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This commit is contained in:
Hiroyuki Ikezoe 2017-04-26 19:20:12 +09:00
parent e5762cb695
commit 1a37e69ce9
1 changed files with 8 additions and 6 deletions
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14
components/selectors/matching.rs
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@ -407,7 +407,7 @@ fn matches_generic_nth_child<E, F>(element: &E,
HAS_SLOW_SELECTOR_LATER_SIBLINGS
});
let mut index = 1;
let mut index: i32 = 1;
let mut next_sibling = if is_from_end {
element.next_sibling_element()
} else {
@ -435,11 +435,13 @@ fn matches_generic_nth_child<E, F>(element: &E,
};
}
if a == 0 {
b == index
} else {
(index - b) / a >= 0 &&
(index - b) % a == 0
// Is there a non-negative integer n such that An+B=index?
match index.checked_sub(b) {
None => false,
Some(an) => match an.checked_div(a) {
Some(n) => n >= 0 && a * n == an,
None /* a == 0 */ => an == 0,
},
}
}