bevy_yoleck/
level_files_upgrading.rs

1use bevy::prelude::*;
2
3/// Upgrade a level file to the most recent Yoleck level format
4pub fn upgrade_level_file(mut level: serde_json::Value) -> Result<serde_json::Value> {
5    let parts = level.as_array_mut().ok_or("Level file must be an array")?;
6    let mut format_version = parts
7        .first()
8        .ok_or("Level file array must not be empty")?
9        .as_object()
10        .ok_or("Level file header must be an object")?
11        .get("format_version")
12        .ok_or("Level file header must have a `format_version` field")?
13        .as_u64()
14        .ok_or("`format_version` must be a non-negative number")?;
15
16    #[allow(clippy::single_element_loop)]
17    for (upgrade_to, upgrade_fn) in [(2, upgrade_level_file_1_to_2)] {
18        if format_version < upgrade_to {
19            upgrade_fn(parts)?;
20            format_version = upgrade_to;
21        }
22    }
23
24    parts[0].as_object_mut().expect("already verified")["format_version"] = format_version.into();
25
26    Ok(level)
27}
28
29fn upgrade_level_file_1_to_2(parts: &mut [serde_json::Value]) -> Result<()> {
30    let header = parts
31        .get_mut(0)
32        .ok_or("Level file must have header as first element")?
33        .as_object_mut()
34        .ok_or("Header must be object")?;
35    header.insert("app_format_version".to_owned(), 0.into());
36
37    let entities = parts
38        .get_mut(2)
39        .ok_or("Level file must have entities list as third element")?
40        .as_array_mut()
41        .ok_or("Entity list must be array")?;
42
43    for entity in entities.iter_mut() {
44        let entity_type = entity
45            .pointer("/0/type")
46            .ok_or("Entity must have a header with a `type` field")?
47            .as_str()
48            .ok_or("Entity `type` must be a string")?
49            .to_owned();
50        let entity_data = entity.get_mut(1).ok_or("Entity must have data")?;
51        let orig_data = entity_data.take();
52        *entity_data = serde_json::Value::Object(Default::default());
53        entity_data[entity_type] = orig_data;
54    }
55    Ok(())
56}
bevy_yoleck/level_files_upgrading.rs

bevy_yoleck/
level_files_upgrading.rs
