Merge pull request #21736 from resouer/check-register

Auto commit by PR queue bot

pkg/util/codeinspector/codeinspector.go

@@ -0,0 +1,80 @@
+/*
+Copyright 2016 The Kubernetes Authors 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 codeinspector
+
+import (
+	"fmt"
+	"go/ast"
+	"go/parser"
+	"go/token"
+	"io/ioutil"
+	"strings"
+	"unicode"
+)
+
+// GetPublicFunctions lists all public functions (not methods) from a golang source file.
+func GetPublicFunctions(filePath string) ([]string, error) {
+	var functionNames []string
+
+	// Create the AST by parsing src.
+	fset := token.NewFileSet() // positions are relative to fset
+	f, err := parser.ParseFile(fset, filePath, nil, 0)
+	if err != nil {
+		return nil, fmt.Errorf("failed parse file to list functions: %v", err)
+	}
+
+	// Inspect the AST and print all identifiers and literals.
+	ast.Inspect(f, func(n ast.Node) bool {
+		var s string
+		switch x := n.(type) {
+		case *ast.FuncDecl:
+			s = x.Name.Name
+			// It's a function (not method), and is public, record it.
+			if x.Recv == nil && isPublic(s) {
+				functionNames = append(functionNames, s)
+			}
+		}
+		return true
+	})
+
+	return functionNames, nil
+}
+
+// isPublic checks if a given string is a public function name.
+func isPublic(myString string) bool {
+	a := []rune(myString)
+	a[0] = unicode.ToUpper(a[0])
+	return myString == string(a)
+}
+
+// GetSourceCodeFiles lists golang source code files from directory, excluding sub-directory and tests files.
+func GetSourceCodeFiles(dir string) ([]string, error) {
+	files, err := ioutil.ReadDir(dir)
+	if err != nil {
+		return nil, err
+	}
+
+	var filenames []string
+
+	for _, file := range files {
+		if strings.HasSuffix(file.Name(), ".go") && !strings.HasSuffix(file.Name(), "_test.go") {
+			filenames = append(filenames, file.Name())
+		}
+	}
+
+	return filenames, nil
+}