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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| package gno | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "go/ast" | ||
| "go/token" | ||
| "strings" | ||
|
|
||
| "go.uber.org/multierr" | ||
| "golang.org/x/tools/go/ast/astutil" | ||
| ) | ||
|
|
||
| const ( | ||
| gnoRealmPkgsPrefixBefore = "gno.land/r/" | ||
| gnoRealmPkgsPrefixAfter = "github.com/gnolang/gno/examples/gno.land/r/" | ||
| gnoPackagePrefixBefore = "gno.land/p/" | ||
| gnoPackagePrefixAfter = "github.com/gnolang/gno/examples/gno.land/p/" | ||
| gnoStdPkgBefore = "std" | ||
| gnoStdPkgAfter = "github.com/gnolang/gno/stdlibs/stdshim" | ||
| ) | ||
|
|
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| var stdlibWhitelist = []string{ | ||
| "regexp", | ||
| "std", | ||
| "strconv", | ||
| "strings", | ||
| } | ||
|
|
||
| func Gno2Go(fset *token.FileSet, f *ast.File) (ast.Node, error) { | ||
| var errs error | ||
|
|
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| imports := astutil.Imports(fset, f) | ||
|
|
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| // import whitelist | ||
| for _, paragraph := range imports { | ||
| for _, importSpec := range paragraph { | ||
| importPath := strings.TrimPrefix(strings.TrimSuffix(importSpec.Path.Value, `"`), `"`) | ||
|
|
||
| if strings.HasPrefix(importPath, gnoRealmPkgsPrefixBefore) { | ||
| continue | ||
| } | ||
|
|
||
| if strings.HasPrefix(importPath, gnoPackagePrefixBefore) { | ||
| continue | ||
| } | ||
|
|
||
| valid := false | ||
| for _, whitelisted := range stdlibWhitelist { | ||
| if importPath == whitelisted { | ||
| valid = true | ||
| continue | ||
| } | ||
| } | ||
| if valid { | ||
| continue | ||
| } | ||
|
|
||
| errs = multierr.Append(errs, fmt.Errorf("import %q is not in the whitelist", importPath)) | ||
| } | ||
| } | ||
|
|
||
| // rewrite imports | ||
| for _, paragraph := range imports { | ||
| for _, importSpec := range paragraph { | ||
| importPath := strings.TrimPrefix(strings.TrimSuffix(importSpec.Path.Value, `"`), `"`) | ||
|
|
||
| // std package | ||
| if importPath == gnoStdPkgBefore { | ||
| if !astutil.RewriteImport(fset, f, gnoStdPkgBefore, gnoStdPkgAfter) { | ||
| errs = multierr.Append(errs, fmt.Errorf("failed to replace the %q package with %q", gnoStdPkgBefore, gnoStdPkgAfter)) | ||
| } | ||
| } | ||
|
|
||
| // p/pkg packages | ||
| if strings.HasPrefix(importPath, gnoPackagePrefixBefore) { | ||
| target := gnoPackagePrefixAfter + strings.TrimPrefix(importPath, gnoPackagePrefixBefore) | ||
|
|
||
| if !astutil.RewriteImport(fset, f, importPath, target) { | ||
| errs = multierr.Append(errs, fmt.Errorf("failed to replace the %q package with %q", importPath, target)) | ||
| } | ||
|
|
||
| } | ||
|
|
||
| // r/realm packages | ||
| if strings.HasPrefix(importPath, gnoRealmPkgsPrefixBefore) { | ||
| target := gnoRealmPkgsPrefixAfter + strings.TrimPrefix(importPath, gnoRealmPkgsPrefixBefore) | ||
|
|
||
| if !astutil.RewriteImport(fset, f, importPath, target) { | ||
| errs = multierr.Append(errs, fmt.Errorf("failed to replace the %q package with %q", importPath, target)) | ||
| } | ||
|
|
||
| } | ||
| } | ||
| } | ||
|
|
||
| // custom handler | ||
| node := astutil.Apply(f, | ||
| // pre | ||
| func(c *astutil.Cursor) bool { | ||
| // do things here | ||
| return true | ||
| }, | ||
| // post | ||
| func(c *astutil.Cursor) bool { | ||
| // and here | ||
| return true | ||
| }, | ||
| ) | ||
|
|
||
| return node, errs | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| package gno | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "errors" | ||
| "go/format" | ||
| "go/parser" | ||
| "go/token" | ||
| "testing" | ||
|
|
||
| "github.com/stretchr/testify/assert" | ||
| ) | ||
|
|
||
| func TestGno2Go(t *testing.T) { | ||
| var cases = []struct { | ||
| name string | ||
| source string | ||
| expectedOutput string | ||
| expectedPreprocessorError error | ||
| }{ | ||
| { | ||
| name: "hello", | ||
| source: "package foo\nfunc hello() string { return \"world\"}", | ||
| expectedOutput: "package foo\nfunc hello() string { return \"world\"}", | ||
| }, { | ||
| name: "use-std", | ||
| source: "package foo\nimport \"std\"\nfunc hello() string { _ = std.Foo\nreturn \"world\"}", | ||
| expectedOutput: "package foo\nimport \"github.com/gnolang/gno/stdlibs/stdshim\"\nfunc hello() string { _ = std.Foo\nreturn \"world\"}", | ||
| }, { | ||
| name: "use-realm", | ||
| source: "package foo\nimport \"gno.land/r/users\"\nfunc foo() { _ = users.Register}", | ||
| expectedOutput: "package foo\nimport \"github.com/gnolang/gno/examples/gno.land/r/users\"\nfunc foo() { _ = users.Register}", | ||
| }, { | ||
| name: "use-avl", | ||
| source: "package foo\nimport \"gno.land/p/avl\"\nfunc foo() { _ = avl.Tree}", | ||
| expectedOutput: "package foo\nimport \"github.com/gnolang/gno/examples/gno.land/p/avl\"\nfunc foo() { _ = avl.Tree}", | ||
| }, { | ||
| name: "use-named-std", | ||
| source: "package foo\nimport bar \"std\"\nfunc hello() string { _ = bar.Foo\nreturn \"world\"}", | ||
| expectedOutput: "package foo\nimport bar \"github.com/gnolang/gno/stdlibs/stdshim\"\nfunc hello() string { _ = bar.Foo\nreturn \"world\"}", | ||
| }, { | ||
| name: "blacklisted-package", | ||
| source: "package foo\nimport \"reflect\"\nfunc foo() { _ = reflect.ValueOf}", | ||
| expectedPreprocessorError: errors.New(`import "reflect" is not in the whitelist`), | ||
| }, { | ||
| name: "whitelisted-package", | ||
| source: "package foo\nimport \"regexp\"\nfunc foo() { _ = regexp.MatchString}", | ||
| expectedOutput: "package foo\nimport \"regexp\"\nfunc foo() { _ = regexp.MatchString}", | ||
| }, | ||
| // multiple files | ||
| // syntax error | ||
| // unknown realm? | ||
| // blacklist | ||
| // etc | ||
| } | ||
| for _, c := range cases { | ||
| c := c // scopelint | ||
| t.Run(c.name, func(t *testing.T) { | ||
| // parse gno | ||
| fset := token.NewFileSet() | ||
| f, err := parser.ParseFile(fset, "foo.go", c.source, parser.ParseComments) | ||
| assert.NoError(t, err) | ||
|
|
||
| // call preprocessor | ||
| transformed, err := Gno2Go(fset, f) | ||
| if c.expectedPreprocessorError == nil { | ||
| assert.NoError(t, err) | ||
| } else { | ||
| assert.Equal(t, err, c.expectedPreprocessorError) | ||
| } | ||
|
|
||
| // generate go | ||
| var buf bytes.Buffer | ||
| err = format.Node(&buf, fset, transformed) | ||
| assert.NoError(t, err) | ||
| got := buf.Bytes() | ||
|
|
||
| // check output | ||
| if c.expectedOutput != "" { | ||
| expect, err := format.Source([]byte(c.expectedOutput)) | ||
| if !bytes.Equal(expect, got) { | ||
| t.Logf("got:\n%s", got) | ||
| t.Logf("expect:\n%s", expect) | ||
| t.Fatal("mismatch") | ||
| } | ||
| assert.NoError(t, err) | ||
| } | ||
| }) | ||
| } | ||
| } |
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