affine_doc_loader 0.1.9

AFFiNE document parsing and rendering utilities.
Documentation 
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use std::collections::HashSet;

use super::{Doc, Map, ParseError, collect_child_ids};

pub(crate) fn patch_children(doc: &Doc, block: &mut Map, children: &[String]) -> Result<(), ParseError> {
  let current = collect_child_ids(block);
  if current == children {
    return Ok(());
  }
  let Some(mut array) = block.get("sys:children").and_then(|value| value.to_array()) else {
    return super::insert_children(doc, block, children);
  };
  let mut remaining: HashSet<_> = children.iter().collect();
  let mut index = 0;
  let mut old = 0;
  for child in children {
    while old < current.len() && current[old] != *child && !remaining.contains(&current[old]) {
      array.remove(index, 1)?;
      old += 1;
    }
    if current.get(old) == Some(child) {
      old += 1;
    } else {
      array.insert(index, child.clone())?;
    }
    remaining.remove(child);
    index += 1;
  }
  if old < current.len() {
    array.remove(index, (current.len() - old) as u64)?;
  }
  Ok(())
}