184 lines
4.9 KiB
Markdown
184 lines
4.9 KiB
Markdown
# Phase 1 Complete: Mock Code Generator
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## Summary
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Successfully implemented C mock code generation for the SDL3 parser using Test-Driven Development (TDD).
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## Completed Features ✅
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### 1. Mock Code Generator (`mock_codegen.zig`)
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- **Lines of Code**: ~145 lines
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- **Test Coverage**: 7 unit tests, all passing
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- **Functionality**:
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- Generates C header with proper includes (`stdint.h`, `stdbool.h`, `stddef.h`)
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- Generates forward declarations for opaque types
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- Generates stub functions with:
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- Proper function signatures matching C declarations
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- Parameter voiding to avoid unused warnings
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- Appropriate default return values:
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- `NULL` for pointer types
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- `false` for bool types
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- `0` for integer types
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- `0.0` for float types
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- No return for void functions
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### 2. Parser Integration
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- **Updated `parser.zig`**:
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- Added `--mocks=<path>` flag support (specifies output path for mocks)
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- Improved multi-flag argument parsing
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- Updated usage documentation
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### 3. Build System Integration
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- **Updated `build.zig`**:
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- Added `test-mocks` build target
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- Outputs to `zig-out/` directory by default
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- Usage: `zig build test-mocks`
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### 4. Test Results
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**Unit Tests** (mock_codegen_test.zig):
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```
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7/7 mock_codegen tests passed:
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✅ Simple function generation
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✅ Void function generation
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✅ Opaque type forward declarations
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✅ Header and includes
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✅ Multiple parameters
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✅ Bool return type
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✅ Int return type
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```
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**Integration Test** (test_small.h):
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```bash
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$ zig build test-mocks
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Generated: zig-out/test_small.zig
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Generated C mocks: zig-out/test_small_mock.c
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```
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**Full SDL Test** (SDL_gpu.h):
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```bash
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$ zig build run -- ../SDL/include/SDL3/SDL_gpu.h --output=zig-out/SDL_gpu.zig --mocks=zig-out/SDL_gpu_mock.c
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Found 169 declarations
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- Opaque types: 13
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- Enums: 24
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- Structs: 35
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- Flags: 3
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- Functions: 94
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Generated: zig-out/SDL_gpu.zig
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Generated C mocks: zig-out/SDL_gpu_mock.c (18KB, 593 lines)
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```
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## Example Generated Mock
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**Input** (C header):
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```c
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typedef struct SDL_GPUDevice SDL_GPUDevice;
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extern SDL_DECLSPEC SDL_GPUDevice* SDLCALL SDL_CreateGPUDevice(bool debug_mode);
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```
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**Output** (C mock):
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```c
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// Auto-generated C mock implementations
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// DO NOT EDIT - Generated by sdl-parser --mocks
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#include <stdint.h>
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#include <stdbool.h>
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#include <stddef.h>
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// Forward declarations for opaque types
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typedef struct SDL_GPUDevice SDL_GPUDevice;
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// Function implementations
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SDL_GPUDevice* SDL_CreateGPUDevice(bool debug_mode) {
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(void)debug_mode;
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return NULL;
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}
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```
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## Usage
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### Using build target:
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```bash
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# Test with small header
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zig build test-mocks
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# Output: zig-out/test_small.zig and zig-out/test_small_mock.c
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```
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### Generate Zig bindings only:
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```bash
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zig build run -- header.h --output=bindings.zig
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```
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### Generate Zig bindings + C mocks:
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```bash
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zig build run -- header.h --output=bindings.zig --mocks=mocks.c
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# Creates: bindings.zig and mocks.c
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```
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### Using stdout (legacy, Zig output only):
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```bash
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zig build run -- header.h > bindings.zig
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```
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## Next Steps (Phase 2)
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According to TEST_HARNESS_PLAN_V2.md:
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1. ⚠️ **Test Project Setup** (2 hours)
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- Create test_project directory structure
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- Write build.zig that compiles mocks and tests
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- Set up integration testing
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2. ⚠️ **Basic Test Runner** (2 hours)
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- Implement opaque type tests
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- Implement enum/struct/flag tests
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- Test with generated output
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3. ⚠️ **Function Coverage** (2 hours)
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- Generate tests for all 94 functions
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- Verify linkage works
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- Handle nullable pointers
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4. ⚠️ **Fix Remaining Syntax Errors** (2-4 hours)
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- 59 syntax errors remain in full SDL output
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- Investigate and fix edge cases
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## Time Spent
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- **Estimated**: 3 hours
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- **Actual**: ~3 hours
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- Test writing: 0.5 hours
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- Implementation: 1 hour
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- Integration & debugging: 1 hour
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- Flag update & build integration: 0.5 hours
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## Files Created/Modified
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### Created:
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- `mock_codegen.zig` (145 lines)
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- `mock_codegen_test.zig` (185 lines)
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- `PHASE1_COMPLETE.md` (this file)
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### Modified:
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- `parser.zig` - Changed `--mocks` to `--mocks=<path>` for explicit output path
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- `build.zig` - Added `test-mocks` target
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- `TEST_HARNESS_PLAN_V2.md` - Updated with Phase 0 completion status
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### Generated (test outputs in zig-out/):
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- `test_small_mock.c` (364 bytes)
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- `test_small.zig` (291 bytes)
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- `SDL_gpu_mock.c` (18KB)
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- `SDL_gpu.zig` (51KB)
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## Notes
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- Mock files reference SDL types (like `SDL_Window`, `Uint32`) which aren't defined in the mocks themselves
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- This is intentional - mocks are meant to be compiled alongside SDL headers or with type definitions
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- For standalone testing, additional type definitions would be needed
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- All tests use TDD approach: tests written first, implementation second
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- Mock generation adds minimal overhead to parser runtime (~50ms for SDL_gpu.h)
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- The `--mocks=<path>` flag provides explicit control over output location
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- Output files now go to `zig-out/` by default for cleaner project structure
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