Function csharp_callable_value_site

internal/cbm/extract_usages.c:1418–1464

Direct identifiers and direct, statically-named TS member values passed as * arguments are narrow syntactic candidates only. A language LSP must still * prove one target at this exact occurrence before the graph upgrades USAGE to * CALL_REFERENCE; unresolved, reassigned, and composite expressions stay USAGE. */

 * prove one target at this exact occurrence before the graph upgrades USAGE to
 * CALL_REFERENCE; unresolved, reassigned, and composite expressions stay USAGE. */
static TSNode csharp_callable_value_site(TSNode node) {
    usage_slow_parent_fallback_test_note();
    const char *kind = ts_node_type(node);
    if (strcmp(kind, "identifier") != 0 && strcmp(kind, "simple_identifier") != 0) {
        return (TSNode){0};
    }

    TSNode site = node;
    TSNode parent = ts_node_parent(site);
    if (!ts_node_is_null(parent) && strcmp(ts_node_type(parent), "generic_name") == 0) {
        TSNode name = ts_node_child_by_field_name(parent, TS_FIELD("name"));
        if (ts_node_is_null(name) && ts_node_named_child_count(parent) > 0) {
            name = ts_node_named_child(parent, 0);
        }
        if (ts_node_is_null(name) || !ts_node_eq(name, node)) {
            return (TSNode){0};
        }
        site = parent;
        parent = ts_node_parent(site);
    }

    if (!ts_node_is_null(parent) && strcmp(ts_node_type(parent), "member_access_expression") == 0) {
        TSNode member = ts_node_child_by_field_name(parent, TS_FIELD("name"));
        if (ts_node_is_null(member) || !ts_node_eq(member, site)) {
            return (TSNode){0};
        }
        site = parent;
        parent = ts_node_parent(site);
    }

    while (!ts_node_is_null(parent) &&
           strcmp(ts_node_type(parent), "parenthesized_expression") == 0) {
        TSNode inner = ts_node_child_by_field_name(parent, TS_FIELD("expression"));
        if (ts_node_is_null(inner) && ts_node_named_child_count(parent) == 1) {
            inner = ts_node_named_child(parent, 0);
        }
        if (ts_node_is_null(inner) || !ts_node_eq(inner, site)) {
            return (TSNode){0};
        }
        site = parent;
        parent = ts_node_parent(site);
    }

    /* The wrapper chain proves admission, but the semantic row is keyed to the
     * terminal method-name identifier. Keep the raw carrier on that leaf. */
    return is_direct_argument_value(site) ? node : (TSNode){0};
}

/* Climb out of the parentheses wrapping a direct argument and return the
 * outermost wrapper, or null when the node is not a parenthesised direct