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hakorune/docs/development/current/main/phases/phase-288/P1-INSTRUCTIONS.md
tomoaki 2b86b658d8 docs(repl): Phase 288 documentation cleanup 
Updated documentation to reflect actual implementation status:
- docs/reference/language/repl.md: Corrected examples (variable persistence TODO)
- docs/development/current/main/10-Now.md: Phase 288 completion noted
- docs/development/current/main/30-Backlog.md: Updated with Phase 288.1 tasks
- docs/development/current/main/phases/phase-288/: Added phase documentation

Accurate REPL behavior examples:
- x = 1 works (implicit local)
- print(x) errors (persistence in Phase 288.1)
- Expression auto-display deferred

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
2025-12-25 14:01:32 +09:00

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Phase 288.1 P1: REPL Session Persistence + Auto-Display (instruction sheet)

Objective

  • Make REPL variables persist across input lines (x = 1 then print(x) works).
  • Add minimal expression auto-display and _ last-value binding (REPL-only).
  • Keep file mode semantics unchanged; quick smokes must remain green.

SSOT:

  • docs/reference/language/repl.md

Constraints (non-negotiable)

  • No new env vars.
  • No file-mode behavior changes.
  • Keep REPL-specific state and logic isolated (Box-first).

Design (recommended)

Do not persist ValueId across evaluations. Persist runtime values (VMValue/handle) in ReplSessionBox, and bridge them via a REPL-only rewrite step.

Bridge approach: REPL-only AST rewrite

In REPL mode, rewrite variable reads/writes that are not declared in the current input line into calls against a REPL session object:

  • Read x → __repl.get("x")
  • Assignment x = expr → __repl.set("x", expr)
  • _ is treated as a normal name in the session (written by auto-display).

This keeps the parser unchanged and avoids contaminating the normal MIR builder scope model.

Session API (REPL-only)

Provide a minimal host object __repl with:

  • get(name: String) -> Any (Fail-Fast if missing)
  • set(name: String, value: Any) -> void
  • reset() -> void

Implementation options:

  • Rust VM only (initially): inject __repl as a built-in box/object available only in --repl.
  • LLVM parity is not required for Phase 288.1; REPL is a dev tool.

Step-by-step

  1. Add a REPL-only __repl host object and VM handlers for get/set/reset.
  2. Implement AST rewrite in the REPL runner before compilation:
    • Collect “declared names” in the current line (local name, function params, etc.).
    • Rewrite remaining identifier reads/writes to __repl.get/set.
  3. Implement auto-display:
    • If the input is a pure expression, print(result) (or equivalent) in REPL only.
    • Store result into session name _ (skip if void).
  4. Add conformance checks (manual is OK if no test harness exists yet):
    • x = 1 (silent)
    • print(x) prints 1
    • y (read) is NameError
    • 1 + 1 prints 2 and _ becomes 2
    • .reset clears variables (print(x) errors)
  5. Run regression gate:
    • ./tools/smokes/v2/run.sh --profile quick must stay 0 FAILED.