Module field_utils 

Field-Specific Utility Functions

Higher-level parsing utilities specific to SWIFT MT message fields. These utilities handle complex field patterns like party identifiers, multiline text, and field-specific validation logic.

Enums

BankOperationCode

Bank operation codes used in Field 23 and similar fields

PaymentMethodCode

Payment method codes used in Field 57 and similar fields

TransactionTypeCode

Transaction type codes used in Field 61 and similar fields

Functions

extract_field_number

Extract the numeric part from mixed alphanumeric field (e.g., “32A” -> “32”)

extract_field_option

Extract field option (e.g., “A” from “:50A:”)

is_numbered_line

Check if a line looks like a numbered field line (e.g., “1/” or “2/” at start)

parse_debit_credit_mark

Parse and validate debit/credit mark (D or C)

parse_field_tag

Parse a field tag with optional variant (e.g., “50A” -> (“50”, Some(‘A’)))

parse_field_with_suffix

Parse field with optional suffix (e.g., “20C” -> (“20”, Some(‘C’)))

parse_multiline_text

Parse multiline text (4*35x format) - simpler version for basic multiline fields

parse_name_and_address

Parse name and address lines (4*35x format) Used in fields 50-59 for party name and address information

parse_numbered_lines

Parse numbered lines format (e.g., “1/ACCOUNT”, “2/NAME”)

parse_party_identifier

Parse party identifier in format /1!a/34x, /2!a/34x, //XX, or /34x Used in fields 51-59 for institutional and party identification

parse_payment_method

Parse payment method from //XX format

validate_field_option

Validate that a field option (like 50A, 50K) matches expected options

validate_multiline_text

Validate multi-line text with specific constraints Returns validated lines as Vec