Function xml_to_snake_case 

pub fn xml_to_snake_case(name: &str) -> String

Convert an ISO 20022 XML element name (PascalCase / mixed-case / all-caps) to a snake_case Rust identifier.

Algorithm

The function inserts an underscore before each uppercase letter that immediately follows a lowercase letter, or before an uppercase letter that is immediately followed by a lowercase letter when the preceding character is also uppercase (to handle runs of capitals such as "BICFI" or the transition in "FIToFI").

Examples

use mx20022_codegen::ir::lower::xml_to_snake_case;

assert_eq!(xml_to_snake_case("BizMsgIdr"),      "biz_msg_idr");
assert_eq!(xml_to_snake_case("FIToFICstmrCdtTrf"), "fi_to_fi_cstmr_cdt_trf");
assert_eq!(xml_to_snake_case("BICFI"),           "bicfi");
assert_eq!(xml_to_snake_case("LEI"),             "lei");
assert_eq!(xml_to_snake_case("Id"),              "id");
assert_eq!(xml_to_snake_case("URLAdr"),          "url_adr");
assert_eq!(xml_to_snake_case("CreDt"),           "cre_dt");