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    for (upgrade_to, upgrade_fn) in [(2, upgrade_level_file_1_to_2)] {
17        if format_version < upgrade_to {
18            upgrade_fn(parts)?;
19            format_version = upgrade_to;
20        }
21    }
22
23    parts[0].as_object_mut().expect("already verified")["format_version"] = format_version.into();
24
25    Ok(level)
26}
27
28fn upgrade_level_file_1_to_2(parts: &mut [serde_json::Value]) -> Result<()> {
29    let header = parts
30        .get_mut(0)
31        .ok_or("Level file must have header as first element")?
32        .as_object_mut()
33        .ok_or("Header must be object")?;
34    header.insert("app_format_version".to_owned(), 0.into());
35
36    let entities = parts
37        .get_mut(2)
38        .ok_or("Level file must have entities list as third element")?
39        .as_array_mut()
40        .ok_or("Entity list must be array")?;
41
42    for entity in entities.iter_mut() {
43        let entity_type = entity
44            .pointer("/0/type")
45            .ok_or("Entity must have a header with a `type` field")?
46            .as_str()
47            .ok_or("Entity `type` must be a string")?
48            .to_owned();
49        let entity_data = entity.get_mut(1).ok_or("Entity must have data")?;
50        let orig_data = entity_data.take();
51        *entity_data = serde_json::Value::Object(Default::default());
52        entity_data[entity_type] = orig_data;
53    }
54    Ok(())
55}
bevy_yoleck/level_files_upgrading.rs

bevy_yoleck/
level_files_upgrading.rs
