dd3c6d1303After some discussion with PVH I realise that the repo structure in the last reorg was very rust-centric. In an attempt to put each language on a level footing move the rust code and project files into ./rust
60 lines
1.3 KiB
Rust
60 lines
1.3 KiB
Rust
use crate::exid::ExId;
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use crate::{Automerge, Value};
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use std::fmt;
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pub struct Values<'a> {
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range: Box<dyn 'a + ValueIter<'a>>,
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doc: &'a Automerge,
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}
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impl<'a> fmt::Debug for Values<'a> {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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f.debug_struct("Values").finish()
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}
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}
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pub(crate) trait ValueIter<'a> {
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fn next_value(&mut self, doc: &'a Automerge) -> Option<(Value<'a>, ExId)>;
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}
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pub(crate) struct NoValues {}
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impl<'a> ValueIter<'a> for NoValues {
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fn next_value(&mut self, _doc: &'a Automerge) -> Option<(Value<'a>, ExId)> {
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None
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}
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}
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impl<'a> Values<'a> {
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pub(crate) fn new<R: 'a + ValueIter<'a>>(doc: &'a Automerge, range: Option<R>) -> Self {
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if let Some(range) = range {
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Self {
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range: Box::new(range),
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doc,
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}
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} else {
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Self::empty(doc)
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}
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}
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pub(crate) fn empty(doc: &'a Automerge) -> Self {
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Self {
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range: Box::new(NoValues {}),
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doc,
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}
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}
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}
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impl<'a> Iterator for Values<'a> {
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type Item = (Value<'a>, ExId);
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fn next(&mut self) -> Option<Self::Item> {
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self.range.next_value(self.doc)
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}
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}
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impl<'a> DoubleEndedIterator for Values<'a> {
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fn next_back(&mut self) -> Option<Self::Item> {
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unimplemented!()
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}
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}
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