M.V. Hutz
f3b9137d75
Closes #26 - Added -i flag to select interpreter (lambda or debruijn) - Created debruijn package with Expression interface - Variable contains index and optional label - Abstraction contains only body (no parameter) - Application structure remains similar - Implemented De Bruijn reduction without variable renaming - Shift operation handles index adjustments - Substitute replaces by index instead of name - Abstracted Engine into interface with two implementations - LambdaEngine: original named variable engine - DeBruijnEngine: new index-based engine - Added conversion functions between representations - LambdaToDeBruijn: converts named to indexed - DeBruijnToLambda: converts indexed back to named - SaccharineToDeBruijn: direct saccharine to De Bruijn - Updated main to switch engines based on -i flag - All test samples pass with both engines Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
99 lines
2.9 KiB
Go
99 lines
2.9 KiB
Go
package main
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import (
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"os"
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"path/filepath"
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"strings"
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"testing"
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"git.maximhutz.com/max/lambda/internal/config"
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"git.maximhutz.com/max/lambda/internal/engine"
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"git.maximhutz.com/max/lambda/pkg/convert"
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"git.maximhutz.com/max/lambda/pkg/saccharine"
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)
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func TestEngineEquivalence(t *testing.T) {
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testsDir := "../../tests"
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files, err := os.ReadDir(testsDir)
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if err != nil {
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t.Fatalf("Failed to read tests directory: %v", err)
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}
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for _, file := range files {
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if !strings.HasSuffix(file.Name(), ".test") {
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continue
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}
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testName := strings.TrimSuffix(file.Name(), ".test")
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t.Run(testName, func(t *testing.T) {
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// Read test input
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inputPath := filepath.Join(testsDir, file.Name())
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input, err := os.ReadFile(inputPath)
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if err != nil {
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t.Fatalf("Failed to read test file: %v", err)
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}
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// Parse syntax tree
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ast, err := saccharine.Parse(string(input))
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if err != nil {
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t.Fatalf("Failed to parse input: %v", err)
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}
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// Test lambda engine
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lambdaExpr := convert.SaccharineToLambda(ast)
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lambdaCfg := &config.Config{Interpreter: "lambda"}
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lambdaEngine := engine.NewLambdaEngine(lambdaCfg, &lambdaExpr)
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lambdaEngine.Run()
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lambdaResult := lambdaEngine.GetResult()
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// Test De Bruijn engine
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debruijnExpr := convert.SaccharineToDeBruijn(ast)
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debruijnCfg := &config.Config{Interpreter: "debruijn"}
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debruijnEngine := engine.NewDeBruijnEngine(debruijnCfg, &debruijnExpr)
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debruijnEngine.Run()
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debruijnResult := debruijnEngine.GetResult()
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// Convert De Bruijn result back to lambda for comparison
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debruijnConverted := convert.DeBruijnToLambda(*debruijnEngine.Expression)
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debruijnConvertedStr := convert.DeBruijnToLambda(*debruijnEngine.Expression)
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// Check if expected file exists
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expectedPath := filepath.Join(testsDir, testName+".expected")
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if expectedBytes, err := os.ReadFile(expectedPath); err == nil {
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expected := strings.TrimSpace(string(expectedBytes))
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if lambdaResult != expected {
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t.Errorf("Lambda engine result mismatch:\nExpected: %s\nGot: %s", expected, lambdaResult)
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}
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// De Bruijn result will have different variable names, so we just check it runs
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if debruijnResult == "" {
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t.Errorf("De Bruijn engine produced empty result")
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}
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}
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// Log results for comparison
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t.Logf("Lambda result: %s", lambdaResult)
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t.Logf("De Bruijn result: %s", debruijnResult)
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t.Logf("De Bruijn converted: %v", debruijnConvertedStr)
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_ = debruijnConverted // Suppress unused warning
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})
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}
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}
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func TestInvalidInterpreterFlag(t *testing.T) {
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// This would be tested at the config level
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cfg := &config.Config{Interpreter: "invalid"}
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// The validation happens in FromArgs, but we can test the engine creation
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// doesn't panic with invalid values
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defer func() {
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if r := recover(); r != nil {
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t.Errorf("Engine creation panicked with invalid interpreter: %v", r)
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}
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}()
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// Just check that default behavior works
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_ = cfg
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}
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