Harness: runner, generator, tasks T01 T13 T14 T15, CLAUDE.md

tasks/T01/spec.md

@@ -0,0 +1,45 @@
+# 1. Goal
+Check the format and the checksum of an IBAN. A payment program calls the check
+before it sends a payment. The program needs one reason code for each IBAN.
+
+# 2. Open questions
+None.
+
+# 3. Context
+- Interface {{P}}IF_IBAN_CHECK exists in package $TMP. It is active.
+- The interface has the type TY_REASON (CHAR 10), the constant structure
+  C_REASON (OK, EMPTY, CHARS, COUNTRY, LENGTH, CHECKSUM), and one method:
+  CHECK IMPORTING iv_iban TYPE string RETURNING VALUE(rv_reason) TYPE ty_reason.
+
+# 4. Contract
+- Create the class {{P}}IBAN_VALIDATOR in package $TMP.
+- The class is public, final, and has a public constructor without parameters.
+- The class implements {{P}}IF_IBAN_CHECK.
+- Do not add other public methods.
+
+# 5. Business rules
+Apply the rules in this sequence. Return the reason of the first rule that fails.
+1. Remove all spaces. Convert all letters to upper case.
+2. If the result is empty, return EMPTY.
+3. The result must contain only the letters A to Z and the digits 0 to 9.
+   Positions 1 and 2 must be letters. Positions 3 and 4 must be digits. If not,
+   return CHARS.
+4. Positions 1 and 2 are the country code. Use this list of codes and lengths:
+   DE 22, GB 22, TR 26, FR 27, NL 18, AT 20, CH 21. If the code is not in the
+   list, return COUNTRY.
+5. If the length is not the length of the country, return LENGTH.
+6. Calculate the checksum: move the first 4 characters to the end. Replace each
+   letter with a number (A = 10, B = 11, ..., Z = 35). Calculate the remainder
+   of this number divided by 97. If the remainder is not 1, return CHECKSUM.
+7. Else return OK.
+
+# 6. Constraints
+- Release target: 7.58.
+- Coding standards: Clean ABAP. Method length below 40 statements. No global
+  variables. No comment that restates the code.
+- Out of scope: do not change {{P}}IF_IBAN_CHECK.
+
+# 7. Acceptance
+- The class is active and has no syntax error.
+- The hidden tests pass.
+- Write your own ABAP Unit tests for the class.