Deferred Triple Diagnostics Refactor

We temporarily disabled structured TRPL00x diagnostics (TRPL001, TRPL004, TRPL006) and one disambiguation test.

Rationale

  • Left-recursive legacy expression grammar made capturing malformed triple literal shapes brittle.
  • Valid and malformed forms currently produce generic SYNTAX diagnostics; this is acceptable short-term because malformed shapes do not silently compile.
  • Unblocking downstream work (expansion, graph features) took priority.

Follow-up Plan

  1. Introduce precedence-based expression grammar (primary -> postfix -> unary -> power -> mult -> add -> rel -> eq -> and -> or -> assign).
  2. Move tripleLiteral into primary (non-left-recursive) so malformed variants parse as a single node.
  3. Ensure unified permissive rule still accepts: missing object, trailing comma, extra components.
  4. Re-enable VisitTripleLiteral to produce MalformedTripleExp and restore TripleDiagnosticsVisitor emission of TRPL codes.
  5. Re-enable tests:
  6. TripleDiagnosticsTests (all methods)
  7. DISAMBIG_01_Simple_Triple_Token_Sequence_Contains_Commas
  8. Remove DISABLE_TRIPLE_DIAGNOSTIC_TESTS symbol and commented test blocks.

Risks if Deferred Too Long

  • Users get low-quality syntax-only errors for common authoring mistakes.
  • Harder to differentiate malformed vs semantic errors in later phases.
  • Potential future expansion logic may need to re-implement malformed detection heuristics (duplication).

Acceptance Criteria

  • All previously disabled tests green without altering their assertions.
  • No generic SYNTAX diagnostics for the malformed triple cases; they carry specific TRPL00x Codes.
  • Precedence grammar passes existing non-triple expression tests.

Owner

Assign in upcoming milestone after current feature branch merges.

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