gr_hz/util/ast.go
2024-04-30 19:30:09 +08:00

66 lines
1.8 KiB
Go

/*
* Copyright 2022 CloudWeGo Authors
*
* 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 util
import (
"bytes"
"fmt"
"go/ast"
"go/format"
"go/parser"
"go/token"
"path/filepath"
"golang.org/x/tools/go/ast/astutil"
)
func AddImport(file, alias, impt string) ([]byte, error) {
fset := token.NewFileSet()
path, _ := filepath.Abs(file)
f, err := parser.ParseFile(fset, path, nil, parser.ParseComments)
if err != nil {
return nil, fmt.Errorf("can not parse ast for file: %s, err: %v", path, err)
}
return addImport(fset, f, alias, impt)
}
func AddImportForContent(fileContent []byte, alias, impt string) ([]byte, error) {
fset := token.NewFileSet()
f, err := parser.ParseFile(fset, "", fileContent, parser.ParseComments)
if err != nil {
return nil, fmt.Errorf("can not parse ast for file: %s, err: %v", fileContent, err)
}
return addImport(fset, f, alias, impt)
}
func addImport(fset *token.FileSet, f *ast.File, alias, impt string) ([]byte, error) {
added := astutil.AddNamedImport(fset, f, alias, impt)
if !added {
return nil, fmt.Errorf("can not add import \"%s\" for file: %s", impt, f.Name.Name)
}
var output []byte
buffer := bytes.NewBuffer(output)
err := format.Node(buffer, fset, f)
if err != nil {
return nil, fmt.Errorf("can not add import for file: %s, err: %v", f.Name.Name, err)
}
return buffer.Bytes(), nil
}