sofie_engine/
slots.rs

1use crate::syntax::{Expression, Path, Root};
2
3#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
4pub enum Step {
5    Field(String),
6    Item,
7}
8
9/// What each open loop or table row name stands for, as steps from the data root.
10#[derive(Default)]
11pub(crate) struct Slots {
12    /// `None` for an index, which holds no data.
13    slots: Vec<Option<Vec<Step>>>,
14}
15
16impl Slots {
17    pub(crate) fn push_items(&mut self, list: &Expression) {
18        let items = self.items_of(list);
19        self.slots.push(items);
20    }
21
22    pub(crate) fn push_dataless(&mut self) {
23        self.slots.push(None);
24    }
25
26    #[cfg(feature = "gates")]
27    pub(crate) fn depth(&self) -> usize {
28        self.slots.len()
29    }
30
31    pub(crate) fn truncate(&mut self, depth: usize) {
32        self.slots.truncate(depth);
33    }
34
35    pub(crate) fn steps_of(&self, path: &Path) -> Option<Vec<Step>> {
36        let mut steps = match path.root {
37            Root::Data => Vec::new(),
38            Root::Slot(slot) => self.slots.get(slot)?.clone()?,
39        };
40        steps.extend(path.fields.iter().cloned().map(Step::Field));
41        Some(steps)
42    }
43
44    pub(crate) fn items_of(&self, list: &Expression) -> Option<Vec<Step>> {
45        let Expression::Path(path) = list else {
46            return None;
47        };
48        let mut steps = self.steps_of(path)?;
49        steps.push(Step::Item);
50        Some(steps)
51    }
52}
sofie_engine/slots.rs

sofie_engine/
slots.rs
