llgen: support go.mod

internal/llgen/llgen.go

@@ -25,6 +25,7 @@ import (
 
 	"github.com/goplus/gogen/packages"
 	"github.com/goplus/llgo/cl"
+	"github.com/goplus/llgo/internal/mod"
 	"golang.org/x/tools/go/ssa"
 	"golang.org/x/tools/go/ssa/ssautil"
 
@@ -37,20 +38,29 @@ func Init() {
 	cl.SetDebug(cl.DbgFlagAll)
 }
 
-func Do(inFile, outFile string) {
-	ret := Gen(inFile, nil)
+func PkgPath(dir string) string {
+	_, pkgPath, err := mod.Load(dir)
+	check(err)
+	return pkgPath
+}
+
+func Do(pkgPath, inFile, outFile string) {
+	ret := Gen(pkgPath, inFile, nil)
 	err := os.WriteFile(outFile, []byte(ret), 0644)
 	check(err)
 }
 
-func Gen(inFile string, src any) string {
+func Gen(pkgPath, inFile string, src any) string {
 	fset := token.NewFileSet()
 	f, err := parser.ParseFile(fset, inFile, src, parser.ParseComments)
 	check(err)
 
 	files := []*ast.File{f}
 	name := f.Name.Name
-	pkg := types.NewPackage(name, name)
+	if pkgPath == "" {
+		pkgPath = name
+	}
+	pkg := types.NewPackage(pkgPath, name)
 	imp := packages.NewImporter(fset)
 	ssaPkg, _, err := ssautil.BuildPackage(
 		&types.Config{Importer: imp}, fset, pkg, files, ssa.SanityCheckFunctions)

internal/mod/mod.go

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package mod
+
+import (
+	"path"
+	"path/filepath"
+
+	"github.com/goplus/mod"
+	"github.com/goplus/mod/gopmod"
+)
+
+// Module represents a Go module.
+type Module = gopmod.Module
+
+// Load loads a Go module from a directory.
+func Load(dir string) (ret *Module, pkgPath string, err error) {
+	if dir, err = filepath.Abs(dir); err != nil {
+		return
+	}
+	_, gomod, err := mod.FindGoMod(dir)
+	if err != nil {
+		return
+	}
+	if ret, err = gopmod.LoadFrom(gomod, ""); err != nil {
+		return
+	}
+	relPath, err := filepath.Rel(ret.Root(), dir)
+	if err != nil {
+		return
+	}
+	pkgPath = path.Join(ret.Path(), filepath.ToSlash(relPath))
+	return
+}