From 588f4cd521a4f6ca283befc09ac3867db91bb55b Mon Sep 17 00:00:00 2001 From: "M.V. Hutz" Date: Mon, 12 Jan 2026 19:39:48 -0500 Subject: [PATCH 1/4] feat: added swap to iterator --- pkg/lambda/iterator.go | 35 ++++++++++++++++++++++------------- pkg/lambda/reduce.go | 36 +++--------------------------------- pkg/lifo/lifo.go | 35 ----------------------------------- 3 files changed, 25 insertions(+), 81 deletions(-) delete mode 100644 pkg/lifo/lifo.go diff --git a/pkg/lambda/iterator.go b/pkg/lambda/iterator.go index 76b711a..31f82f9 100644 --- a/pkg/lambda/iterator.go +++ b/pkg/lambda/iterator.go @@ -5,13 +5,15 @@ type Iterator struct { } func NewIterator(expr *Expression) *Iterator { - return &Iterator{ - trace: []*Expression{expr}, - } + return &Iterator{[]*Expression{expr}} +} + +func (i *Iterator) Done() bool { + return len(i.trace) == 0 } func (i *Iterator) Current() *Expression { - if len(i.trace) < 1 { + if i.Done() { return nil } @@ -26,6 +28,22 @@ func (i *Iterator) Parent() *Expression { return i.trace[len(i.trace)-2] } +func (i *Iterator) Swap(with Expression) { + current := i.Current() + if current != nil { + *current = with + } +} + +func (i *Iterator) Back() bool { + if i.Done() { + return false + } + + i.trace = i.trace[:len(i.trace)-1] + return true +} + func (i *Iterator) Next() { switch typed := (*i.Current()).(type) { case *Abstraction: @@ -48,12 +66,3 @@ func (i *Iterator) Next() { i.trace = []*Expression{} } } - -func (i *Iterator) Back() bool { - if len(i.trace) == 0 { - return false - } - - i.trace = i.trace[:len(i.trace)-1] - return true -} diff --git a/pkg/lambda/reduce.go b/pkg/lambda/reduce.go index 8e56bd0..7bcf50c 100644 --- a/pkg/lambda/reduce.go +++ b/pkg/lambda/reduce.go @@ -1,32 +1,5 @@ package lambda -import ( - "git.maximhutz.com/max/lambda/pkg/lifo" -) - -func ReduceOnce(e *Expression) bool { - stack := lifo.New(e) - - for !stack.Empty() { - top := stack.MustPop() - - switch typed := (*top).(type) { - case *Abstraction: - stack.Push(&typed.body) - case *Application: - if fn, fnOk := typed.abstraction.(*Abstraction); fnOk { - *top = Substitute(fn.body, fn.parameter, typed.argument) - return true - } - - stack.Push(&typed.argument) - stack.Push(&typed.abstraction) - } - } - - return false -} - func IsViable(e *Expression) (*Abstraction, Expression, bool) { if e == nil { return nil, nil, false @@ -42,18 +15,15 @@ func IsViable(e *Expression) (*Abstraction, Expression, bool) { func ReduceAll(e *Expression, step func()) { it := NewIterator(e) - for it.Current() != nil { - current := it.Current() - - if fn, arg, ok := IsViable(current); !ok { + for !it.Done() { + if fn, arg, ok := IsViable(it.Current()); !ok { it.Next() } else { - *current = Substitute(fn.body, fn.parameter, arg) + it.Swap(Substitute(fn.body, fn.parameter, arg)) step() if _, _, ok := IsViable(it.Parent()); ok { it.Back() - } else { } } } diff --git a/pkg/lifo/lifo.go b/pkg/lifo/lifo.go deleted file mode 100644 index 6cc51d1..0000000 --- a/pkg/lifo/lifo.go +++ /dev/null @@ -1,35 +0,0 @@ -package lifo - -import "fmt" - -type LIFO[T any] []T - -func New[T any](items ...T) *LIFO[T] { - l := LIFO[T](items) - return &l -} - -func (l *LIFO[T]) Push(item T) { - *l = append(*l, item) -} - -func (l *LIFO[T]) Empty() bool { - return len(*l) == 0 -} - -func (l *LIFO[T]) MustPop() T { - var item T - - *l, item = (*l)[:len(*l)-1], (*l)[len(*l)-1] - return item -} - -func (l *LIFO[T]) Pop() (T, error) { - var item T - - if l.Empty() { - return item, fmt.Errorf("stack is exhausted") - } - - return l.MustPop(), nil -} -- 2.49.1 From 4a5c424e54d8dd59c479beb5a15248d7259f17b2 Mon Sep 17 00:00:00 2001 From: "M.V. Hutz" Date: Mon, 12 Jan 2026 20:04:00 -0500 Subject: [PATCH 2/4] test: add dynamic test discovery and validity checks. Modified benchmark_test.go to dynamically discover all .test files in the tests directory instead of using hardcoded paths. Added TestSamplesValidity integration test that validates each test file against its corresponding .expected file. Added runSampleWithOutput helper function to capture interpreter output. Added new test cases with expected outputs for validation. --- cmd/lambda/benchmark_test.go | 90 ++++++++++++++++++++--- go.mod | 8 ++ go.sum | 9 +++ tests/church_5^5.expected | 1 + tests/{church.test => church_5^5.test} | 3 +- tests/church_6^6.expected | 1 + tests/church_6^6.test | 8 ++ tests/fast_list_2^30.expected | 1 + tests/{fast.test => fast_list_2^30.test} | 0 tests/list_2^30.expected | 1 + tests/{saccharine.test => list_2^30.test} | 0 tests/simple.test | 16 ---- tests/thunk.expected | 1 + 13 files changed, 113 insertions(+), 26 deletions(-) create mode 100644 go.sum create mode 100644 tests/church_5^5.expected rename tests/{church.test => church_5^5.test} (71%) create mode 100644 tests/church_6^6.expected create mode 100644 tests/church_6^6.test create mode 100644 tests/fast_list_2^30.expected rename tests/{fast.test => fast_list_2^30.test} (100%) create mode 100644 tests/list_2^30.expected rename tests/{saccharine.test => list_2^30.test} (100%) delete mode 100644 tests/simple.test create mode 100644 tests/thunk.expected diff --git a/cmd/lambda/benchmark_test.go b/cmd/lambda/benchmark_test.go index 72fd5b6..aaeab0d 100644 --- a/cmd/lambda/benchmark_test.go +++ b/cmd/lambda/benchmark_test.go @@ -2,6 +2,8 @@ package main import ( "os" + "path/filepath" + "strings" "testing" "git.maximhutz.com/max/lambda/internal/config" @@ -9,6 +11,7 @@ import ( "git.maximhutz.com/max/lambda/pkg/convert" "git.maximhutz.com/max/lambda/pkg/lambda" "git.maximhutz.com/max/lambda/pkg/saccharine" + "github.com/stretchr/testify/assert" ) // Helper function to run a single sample through the lambda interpreter. @@ -48,17 +51,86 @@ func runSample(samplePath string) error { return nil } -// Benchmark all samples using sub-benchmarks. -func BenchmarkSamples(b *testing.B) { - samples := map[string]string{ - "Church": "../../tests/church.test", - "Fast": "../../tests/fast.test", - "Saccharine": "../../tests/saccharine.test", - "Simple": "../../tests/simple.test", - "Thunk": "../../tests/thunk.test", +// Helper function to run a sample and return its output. +func runSampleWithOutput(samplePath string) (string, error) { + // Read the sample file. + input, err := os.ReadFile(samplePath) + if err != nil { + return "", err } - for name, path := range samples { + // Parse code into syntax tree. + ast, err := saccharine.Parse(string(input)) + if err != nil { + return "", err + } + + // Compile expression to lambda calculus. + compiled := convert.SaccharineToLambda(ast) + + // Create minimal config for testing. + cfg := &config.Config{ + Source: config.StringSource{Data: ""}, + Destination: config.StdoutDestination{}, + Profile: "", + Explanation: false, + Statistics: false, + Verbose: false, + } + + // Create and run the engine. + process := engine.New(cfg, &compiled) + process.Run() + + // Get final result. + output := lambda.Stringify(compiled) + return output + "\n", nil +} + +// Test that all samples produce expected output. +func TestSamplesValidity(t *testing.T) { + // Discover all .test files in the tests directory. + testFiles, err := filepath.Glob("../../tests/*.test") + assert.NoError(t, err, "Failed to read tests directory.") + assert.NotEmpty(t, testFiles, "No '*.test' files found in directory.") + + for _, testPath := range testFiles { + // Build expected file path. + expectedPath := strings.TrimSuffix(testPath, filepath.Ext(testPath)) + ".expected" + + // Check if expected file exists. + if _, err := os.Stat(expectedPath); os.IsNotExist(err) { + continue + } + + name := strings.TrimSuffix(filepath.Base(testPath), filepath.Ext(testPath)) + + t.Run(name, func(t *testing.T) { + // Run the sample and capture output. + actual, err := runSampleWithOutput(testPath) + assert.NoError(t, err, "Failed to run sample.") + + // Read expected output. + expectedBytes, err := os.ReadFile(expectedPath) + assert.NoError(t, err, "Failed to read expected output.") + expected := string(expectedBytes) + + // Compare outputs. + assert.Equal(t, expected, actual, "Output does not match expected.") + }) + } +} + +// Benchmark all samples using sub-benchmarks. +func BenchmarkSamples(b *testing.B) { + // Discover all .test files in the tests directory. + testFiles, err := filepath.Glob("../../tests/*.test") + assert.NoError(b, err, "Failed to read tests directory.") + assert.NotEmpty(b, testFiles, "No '*.test' files found in directory.") + + for _, path := range testFiles { + name := strings.TrimSuffix(filepath.Base(path), filepath.Ext(path)) + b.Run(name, func(b *testing.B) { for b.Loop() { if err := runSample(path); err != nil { diff --git a/go.mod b/go.mod index d3ec3aa..241b0b4 100644 --- a/go.mod +++ b/go.mod @@ -1,3 +1,11 @@ module git.maximhutz.com/max/lambda go 1.25.5 + +require github.com/stretchr/testify v1.11.1 + +require ( + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/pmezard/go-difflib v1.0.0 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..cc8b3f4 --- /dev/null +++ b/go.sum @@ -0,0 +1,9 @@ +github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= +github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= +github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= +github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U= +github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U= +gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= +gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= +gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= diff --git a/tests/church_5^5.expected b/tests/church_5^5.expected new file mode 100644 index 0000000..e4872e9 --- /dev/null +++ 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diff --git a/tests/church.test b/tests/church_5^5.test similarity index 71% rename from tests/church.test rename to tests/church_5^5.test index 571d394..10ae127 100644 --- a/tests/church.test +++ b/tests/church_5^5.test @@ -1,7 +1,8 @@ 0 := \f.\x.x inc n := \f x.(f (n f x)) exp n m := (m n) +print n := (n F X) N := (inc (inc (inc (inc (inc 0))))) -(exp N N) +(print (exp N N)) diff --git a/tests/church_6^6.expected b/tests/church_6^6.expected new file mode 100644 index 0000000..59350d6 --- /dev/null +++ b/tests/church_6^6.expected @@ -0,0 +1 @@ +(F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F (F 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diff --git a/tests/church_6^6.test b/tests/church_6^6.test new file mode 100644 index 0000000..104b5fc --- /dev/null +++ b/tests/church_6^6.test @@ -0,0 +1,8 @@ +0 := \f.\x.x +inc n := \f x.(f (n f x)) +exp n m := (m n) +print n := (n F X) + +N := (inc (inc (inc (inc (inc (inc 0)))))) + +(print (exp N N)) diff --git a/tests/fast_list_2^30.expected b/tests/fast_list_2^30.expected new file mode 100644 index 0000000..3fb3f21 --- /dev/null +++ b/tests/fast_list_2^30.expected @@ -0,0 +1 @@ +(0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (1 END))))))))))))))))))))))))))))))) diff --git a/tests/fast.test b/tests/fast_list_2^30.test similarity index 100% rename from tests/fast.test rename to tests/fast_list_2^30.test diff --git a/tests/list_2^30.expected b/tests/list_2^30.expected new file mode 100644 index 0000000..3fb3f21 --- /dev/null +++ b/tests/list_2^30.expected @@ -0,0 +1 @@ +(0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (0 (1 END))))))))))))))))))))))))))))))) diff --git a/tests/saccharine.test b/tests/list_2^30.test similarity index 100% rename from tests/saccharine.test rename to tests/list_2^30.test diff --git a/tests/simple.test b/tests/simple.test deleted file mode 100644 index 192f069..0000000 --- a/tests/simple.test +++ /dev/null @@ -1,16 +0,0 @@ -(\0. - (\inc. - (\add. - (\mult. - (\exp. - (exp (inc (inc (inc (inc 0)))) (inc (inc (inc (inc (inc 0)))))) - \n m.(m n) - ) - \m n f.(m (n f)) - ) - \n m.(m inc n) - ) - \n f x.(f (n f x)) - ) - \f x.x -) diff --git a/tests/thunk.expected b/tests/thunk.expected new file mode 100644 index 0000000..2dfe6a3 --- /dev/null +++ b/tests/thunk.expected @@ -0,0 +1 @@ +VALUE -- 2.49.1 From e17a85e0a3f74577f9486a91aeef903206421847 Mon Sep 17 00:00:00 2001 From: "M.V. Hutz" Date: Mon, 12 Jan 2026 20:09:21 -0500 Subject: [PATCH 3/4] refactor: use assert throughout tests and require expected files. Renamed benchmark_test.go to lambda_test.go. Consolidated helper functions to use single runSample function. Replaced all error handling with assert for consistency. Removed optional expected file check to require all test files have corresponding expected files. --- .../{benchmark_test.go => lambda_test.go} | 59 +++---------------- 1 file changed, 7 insertions(+), 52 deletions(-) rename cmd/lambda/{benchmark_test.go => lambda_test.go} (67%) diff --git a/cmd/lambda/benchmark_test.go b/cmd/lambda/lambda_test.go similarity index 67% rename from cmd/lambda/benchmark_test.go rename to cmd/lambda/lambda_test.go index aaeab0d..9f827f8 100644 --- a/cmd/lambda/benchmark_test.go +++ b/cmd/lambda/lambda_test.go @@ -15,17 +15,17 @@ import ( ) // Helper function to run a single sample through the lambda interpreter. -func runSample(samplePath string) error { +func runSample(samplePath string) (string, error) { // Read the sample file. input, err := os.ReadFile(samplePath) if err != nil { - return err + return "", err } // Parse code into syntax tree. ast, err := saccharine.Parse(string(input)) if err != nil { - return err + return "", err } // Compile expression to lambda calculus. @@ -45,46 +45,7 @@ func runSample(samplePath string) error { process := engine.New(cfg, &compiled) process.Run() - // Get final result (to ensure it's not optimized away). - _ = lambda.Stringify(compiled) - - return nil -} - -// Helper function to run a sample and return its output. -func runSampleWithOutput(samplePath string) (string, error) { - // Read the sample file. - input, err := os.ReadFile(samplePath) - if err != nil { - return "", err - } - - // Parse code into syntax tree. - ast, err := saccharine.Parse(string(input)) - if err != nil { - return "", err - } - - // Compile expression to lambda calculus. - compiled := convert.SaccharineToLambda(ast) - - // Create minimal config for testing. - cfg := &config.Config{ - Source: config.StringSource{Data: ""}, - Destination: config.StdoutDestination{}, - Profile: "", - Explanation: false, - Statistics: false, - Verbose: false, - } - - // Create and run the engine. - process := engine.New(cfg, &compiled) - process.Run() - - // Get final result. - output := lambda.Stringify(compiled) - return output + "\n", nil + return lambda.Stringify(compiled) + "\n", nil } // Test that all samples produce expected output. @@ -98,16 +59,11 @@ func TestSamplesValidity(t *testing.T) { // Build expected file path. expectedPath := strings.TrimSuffix(testPath, filepath.Ext(testPath)) + ".expected" - // Check if expected file exists. - if _, err := os.Stat(expectedPath); os.IsNotExist(err) { - continue - } - name := strings.TrimSuffix(filepath.Base(testPath), filepath.Ext(testPath)) t.Run(name, func(t *testing.T) { // Run the sample and capture output. - actual, err := runSampleWithOutput(testPath) + actual, err := runSample(testPath) assert.NoError(t, err, "Failed to run sample.") // Read expected output. @@ -133,9 +89,8 @@ func BenchmarkSamples(b *testing.B) { b.Run(name, func(b *testing.B) { for b.Loop() { - if err := runSample(path); err != nil { - b.Fatal(err) - } + _, err := runSample(path) + assert.NoError(b, err, "Failed to run sample.") } }) } -- 2.49.1 From 5ccc41b104663c1cb819553e7f77ddcece2a8bbc Mon Sep 17 00:00:00 2001 From: "M.V. Hutz" Date: Mon, 12 Jan 2026 20:13:14 -0500 Subject: [PATCH 4/4] feat: add test target to Makefile. Added make test directive that runs tests without benchmarks. Updated help text to include the new test target. --- Makefile | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/Makefile b/Makefile index cc7e5e5..1d52d28 100644 --- a/Makefile +++ b/Makefile @@ -1,7 +1,7 @@ BINARY_NAME=lambda TEST=simple -.PHONY: help build run profile explain graph docs bench clean +.PHONY: help build run profile explain graph docs test bench clean .DEFAULT_GOAL := help .SILENT: @@ -13,6 +13,7 @@ help: echo " explain - Build and run with explanation mode and profiling" echo " graph - Generate and open CPU profile visualization" echo " docs - Start local godoc server on port 6060" + echo " test - Run tests for all samples" echo " bench - Run benchmarks for all samples" echo " clean - Remove all build artifacts" @@ -38,6 +39,9 @@ docs: echo ">>> View at 'http://localhost:6060/pkg/git.maximhutz.com/max/lambda/'" go run golang.org/x/tools/cmd/godoc@latest -http=:6060 +test: + go test -v ./cmd/lambda + bench: go test -bench=. -benchtime=10x -cpu=4 ./cmd/lambda -- 2.49.1