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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
//! Specified types for CSS tree-counting functions.
use crate::derives::*;
use crate::values::computed::Context;
/// A CSS tree-counting function: `sibling-index()` or `sibling-count()`.
#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq, PartialOrd, ToCss, ToShmem, ToTyped)]
#[repr(u8)]
pub enum TreeCountingFunction {
/// `sibling-count()`: the total number of siblings of the element, including itself.
#[css(function)]
SiblingCount,
/// `sibling-index()`: the 1-based index of the element among its siblings.
#[css(function)]
SiblingIndex,
}
impl TreeCountingFunction {
/// Computes the value of this tree-counting function.
pub fn to_computed_value(&self, context: &Context) -> u32 {
match self {
TreeCountingFunction::SiblingCount => context.query_sibling_count(),
TreeCountingFunction::SiblingIndex => context.query_sibling_index(),
}
}
}