48 lines
2.0 KiB
Markdown
48 lines
2.0 KiB
Markdown
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Status: Completed (2025-12-20)
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Scope: `StringUtils.index_of_string/2`（dynamic window scan）を JoinIR で受理して `--profile quick` を進める。
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Related:
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- Now: `docs/development/current/main/10-Now.md`
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- Phase 257: `docs/development/current/main/phases/phase-257/README.md`
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- Phase 259 (Next): `docs/development/current/main/phases/phase-259/README.md`
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- Design goal: `docs/development/current/main/design/join-explicit-cfg-construction.md`
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# Phase 258: `StringUtils.index_of_string/2` (dynamic window scan)
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## Current Status (SSOT)
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- ✅ **P0 完了**（2025-12-21）
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- Former first FAIL: `json_lint_vm / StringUtils.index_of_string/2`
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- **New first FAIL**: `json_lint_vm / StringUtils.is_integer/1`（Phase 259へ移行）
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- Shape summary (from quick log):
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- prelude: `if substr.length()==0 return 0`, `if substr.length()>s.length() return -1`
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- loop: `loop(i <= s.length() - substr.length()) { if s.substring(i, i+substr.length()) == substr return i; i=i+1 }`
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- post: `return -1`
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- caps: `If,Loop,Return`
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## Goal
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- ✅ `./tools/smokes/v2/run.sh --profile quick` が `StringUtils.index_of_string/2` を突破し、次の FAIL へ進む
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## Proposed Approach (P0)
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方針: Pattern6（ScanWithInit）を “needle length 付き scan” に最小拡張する（構造で解決）
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Pattern6 との差分だけを足す:
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- loop cond: `i <= s.length() - substr.length()`（bound 付き）
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- window: `substring(i, i + substr.length())`
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- needle: `substr`（String）
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JoinIR 側は P0 では “毎回 length() を呼んでよい”。まず correctness を固定:
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- `needle_len = substr.length()`
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- `bound = s.length() - needle_len`
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- stop: `i > bound` で k_exit（not-found return）
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- match: `s.substring(i, i + needle_len) == substr` で return i
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- step: `i = i + 1`
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## Tasks (Draft)
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1) Fixture + integration smokes
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2) Pattern6 extractor を拡張して `index_of_string/2` の loop 形を accept（Fail-Fast）
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3) Pattern6 lowerer を拡張（dynamic window length / bound）して JoinIR を生成
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4) `--verify` / integration / quick を回して SSOT 更新
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