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130 lines
No EOL
3.9 KiB
Markdown
130 lines
No EOL
3.9 KiB
Markdown
## Microstep Guide for Q16_16 Unification Migration
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This guide provides precise steps for migrating any file from PhysicsScalar/ElectromagneticSpectrum to canonical FixedPoint Q16_16.
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### 🔍 PRE-MIGRATION ASSESSMENT
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1. **Check file dependencies:**
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```bash
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cd /home/allaun/Research Stack
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grep -n "PhysicsScalar\|ElectromagneticSpectrum" 0-Core-Formalism/lean/Semantics/Semantics/FILENAME.lean
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```
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2. **Identify usage patterns:**
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- Type-only usage: `tension : PhysicsScalar.Q16_16` (simple migration)
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- Function usage: `PhysicsScalar.Q16_16.zero`, `mean3`, etc. (requires bridge)
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- Mixed usage: Both type and function calls
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### 🔄 SIMPLE TYPE-ONLY MIGRATION
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For files that only use Q16_16 as field types (like ManifoldStructures.lean):
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**Step 1:** Update imports
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```diff
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-import Semantics.PhysicsScalar
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+import Semantics.FixedPoint
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```
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**Step 2:** Update open statements
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```diff
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-open Semantics.PhysicsScalar
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+open Semantics.FixedPoint
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```
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**Step 3:** Test build
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```bash
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cd 0-Core-Formalism/lean/Semantics
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lake build Semantics.FILENAME
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```
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### 🌉 FUNCTION-USING MIGRATION
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For files that call PhysicsScalar functions:
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**Step 1:** Add bridge import
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```lean
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import Semantics.PhysicsScalarBridge
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```
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**Step 2:** Replace specific function calls
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```diff
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-let value := PhysicsScalar.Q16_16.zero
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+let value := Semantics.FixedPoint.Q16_16.zero
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-let avg := PhysicsScalar.Q16_16.mean3 a b c
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+let avg := Semantics.PhysicsScalarBridge.add (Semantics.PhysicsScalarBridge.add a b) c
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+let avg := Semantics.FixedPoint.Q16_16.ofRawInt ((avg_raw + 1) / 3) -- manual conversion
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```
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**Step 3:** Use bridge for arithmetic
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```diff
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-let result := PhysicsScalar.Q16_16.add a b
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+let result := Semantics.PhysicsScalarBridge.add a b
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```
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### ⚠️ COMMON COMPILATION ERRORS & FIXES
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**Error:** `unknown identifier 'PhysicsScalar.Q16_16.zero'`
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**Fix:** Replace with `Semantics.FixedPoint.Q16_16.zero` or use bridge
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**Error:** `type mismatch PhysicsScalar.Q16_16 vs Q16_16`
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**Fix:** Ensure all references use the same Q16_16 variant throughout the file
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**Error:** `unknown field 'tension'`
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**Fix:** The field name is the same; check that the import/open statements are correct
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### 🧪 VERIFICATION STEPS
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1. **Syntax check:**
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```bash
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lake build Semantics.FILENAME --quiet
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```
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2. **Full build verification:**
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```bash
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lake build --quiet
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```
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3. **If build fails, common fixes:**
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- Check that all Q16_16 references use the same variant
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- Ensure PhysicsScalarBridge is imported when needed
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- Verify field names match between variants (they should be identical)
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### 📋 MIGRATION PRIORITY LIST
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**Phase 1 - Type-only files (easiest):**
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1. ManifoldStructures.lean ✅ (completed)
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2. Errors.lean
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3. SensorField.lean (has complex dependencies - may need partial approach)
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**Phase 2 - Simple function usage:**
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4. BoundaryDynamics.lean
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5. CausalGeometry.lean
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**Phase 3 - Complex function usage:**
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6. PhysicsEuclidean.lean (re-exports PhysicsScalar)
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7. PhysicsLagrangian.lean (re-exports PhysicsScalar)
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### 🛠️ BRIDGE FUNCTIONS AVAILABLE
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In `Semantics.PhysicsScalarBridge`:
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- `toFixedPoint : PhysicsScalar.Q16_16 → Semantics.FixedPoint.Q16_16`
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- `fromFixedPoint : Semantics.FixedPoint.Q16_16 → PhysicsScalar.Q16_16`
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- `add`, `mul`, `sub` - bridged arithmetic operations
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### 🚨 RISK MITIGATION
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1. **Always backup:** `git stash` before starting
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2. **Small changes:** Migrate one file at a time
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3. **Test immediately:** Run `lake build` after each change
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4. **Use bridge:** When in doubt, use PhysicsScalarBridge for compatibility
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5. **Preserve semantics:** Pay attention to signed vs unsigned behavior differences
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### ✅ SUCCESS CRITERIA
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- File compiles with `lake build Semantics.FILENAME`
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- Full project builds with `lake build`
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- No new type mismatch errors
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- Functionality preserved (semantic equivalence maintained)
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This microstep approach allows any LLM to systematically migrate files while maintaining build integrity and semantic correctness. |