Marvin Preuss
1d4ae27878
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68 lines
1.6 KiB
Markdown
68 lines
1.6 KiB
Markdown
[](https://goreportcard.com/report/github.com/go-toolsmith/astequal)
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[](https://godoc.org/github.com/go-toolsmith/astequal)
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[](https://travis-ci.org/go-toolsmith/astequal)
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# astequal
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Package astequal provides AST (deep) equallity check operations.
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## Installation:
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```bash
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go get github.com/go-toolsmith/astequal
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```
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## Example
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```go
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package main
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import (
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"fmt"
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"go/ast"
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"go/parser"
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"go/token"
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"log"
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"reflect"
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"github.com/go-toolsmith/astequal"
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)
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func main() {
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const code = `
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package foo
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func main() {
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x := []int{1, 2, 3}
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x := []int{1, 2, 3}
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}`
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fset := token.NewFileSet()
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pkg, err := parser.ParseFile(fset, "string", code, 0)
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if err != nil {
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log.Fatalf("parse error: %+v", err)
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}
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fn := pkg.Decls[0].(*ast.FuncDecl)
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x := fn.Body.List[0]
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y := fn.Body.List[1]
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// Reflect DeepEqual will fail due to different Pos values.
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// astequal only checks whether two nodes describe AST.
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fmt.Println(reflect.DeepEqual(x, y)) // => false
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fmt.Println(astequal.Node(x, y)) // => true
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fmt.Println(astequal.Stmt(x, y)) // => true
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}
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```
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## Performance
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`astequal` outperforms reflection-based comparison by a big margin:
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```
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BenchmarkEqualExpr/astequal.Expr-8 5000000 298 ns/op 0 B/op 0 allocs/op
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BenchmarkEqualExpr/astequal.Node-8 3000000 409 ns/op 0 B/op 0 allocs/op
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BenchmarkEqualExpr/reflect.DeepEqual-8 50000 38898 ns/op 10185 B/op 156 allocs/op
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```
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