30 lines
1.3 KiB
Markdown
30 lines
1.3 KiB
Markdown
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Status: Active
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Scope: `StringUtils.is_integer/1`（nested-if + loop）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 258: `docs/development/current/main/phases/phase-258/README.md`
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- Design goal: `docs/development/current/main/design/join-explicit-cfg-construction.md`
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# Phase 259: `StringUtils.is_integer/1` (nested-if + loop)
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## Current Status (SSOT)
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- Current first FAIL: `json_lint_vm / StringUtils.is_integer/1`
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- Shape summary（ログ由来）:
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- prelude: nested-if to compute `start` (handles leading `"-"`)
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- loop: `loop(i < s.length()) { if not this.is_digit(s.substring(i, i+1)) { return false } i = i + 1 }`
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- post: `return true`
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- caps: `If,Loop,NestedIf,Return`
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## Goal
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- `StringUtils.is_integer/1` を JoinIR で受理し、quick の first FAIL を次へ進める
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## Proposed Approach (P0)
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方針: prelude（nested-if）は既存 lowering のまま、loop 部分だけを scan パターンへ寄せる（構造で解決）。
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P0 の狙い:
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- loop の core は “scan until mismatch” で、Pattern6（scan）と近い
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- ただし return 値が `i/-1` ではなく `true/false` なので、scan パターンの “return payload” を一般化する必要がある可能性がある
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