Function flatten_param_matcher

crates/openshell-policy/src/lib.rs:403–419

Walk one params subtree, carrying the flattened dot-path key accumulated so far. Leaf matchers are inserted into the map consumed by the runtime policy.

(
    key: &str,
    matcher: ParamMatcherDef,
    out: &mut BTreeMap<String, QueryMatcherDef>,
)

// Walk one params subtree, carrying the flattened dot-path key accumulated so
// far. Leaf matchers are inserted into the map consumed by the runtime policy.
fn flatten_param_matcher(
    key: &str,
    matcher: ParamMatcherDef,
    out: &mut BTreeMap<String, QueryMatcherDef>,
) {
    match matcher {
        ParamMatcherDef::Matcher(matcher) => {
            out.insert(key.to_string(), matcher);
        }
        ParamMatcherDef::Object(children) => {
            for (child_key, child) in children {
                let nested_key = format!("{key}.{child_key}");
                flatten_param_matcher(&nested_key, child, out);
            }
        }
    }
}

// Convert flat runtime params back to YAML. MCP gets readable nested params
// when the flat keys can be losslessly split. Non-MCP protocols keep flat keys