Function diff_values

nodedb/src/event/field_diff.rs:154–189

Recursive diff of two JSON values at a given path prefix.

(
    diffs: &mut Vec<FieldDiff>,
    prefix: &str,
    old: &serde_json::Value,
    new: &serde_json::Value,
)

/// Recursive diff of two JSON values at a given path prefix.
fn diff_values(
    diffs: &mut Vec<FieldDiff>,
    prefix: &str,
    old: &serde_json::Value,
    new: &serde_json::Value,
) {
    if old == new {
        return;
    }

    match (old, new) {
        (serde_json::Value::Object(old_map), serde_json::Value::Object(new_map)) => {
            diff_objects(diffs, prefix, old_map, new_map);
        }
        (serde_json::Value::Array(old_arr), serde_json::Value::Array(new_arr)) => {
            diff_arrays(diffs, prefix, old_arr, new_arr);
        }
        // String fields: try to produce TextInsert/TextDelete for simple edits.
        (serde_json::Value::String(old_s), serde_json::Value::String(new_s))
            if !prefix.is_empty() =>
        {
            diff_strings(diffs, prefix, old_s, new_s);
        }
        _ => {
            // Scalar or type mismatch — emit a Modified diff.
            if !prefix.is_empty() {
                diffs.push(FieldDiff {
                    field: prefix.to_owned(),
                    op: DiffOp::Modified,
                    old_value: Some(old.clone()),
                    new_value: Some(new.clone()),
                });
            }
        }
    }
}

/// Diff two JSON objects field-by-field.
fn diff_objects(