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Listing Public Methods of a Package in Go
Question:
How is it possible to enumerate the public methods of a package in Go? Consider the following code structure:
main.go:
package main func main() { // list public methods in here }
libs/method.go:
package libs func Result1() { fmt.Println("method Result1") } func Result2() { fmt.Println("method Result2") }
Answer:
Regrettably, Go lacks a direct feature for this request. When a package is imported, the compiler may remove unused methods during optimization. Thus, the mere importing of a package does not guarantee the presence of all methods.
Alternatives:
Static Analysis:
You can parse the package's source code and extract function declarations using Go's reflection library. Consider the following example:
import ( "fmt" "go/parser" "go/token" ) func main() { fileset := token.NewFileSet() packages, err := parser.ParseDir(fileset, "./libs", nil, 0) if err != nil { fmt.Println("Parsing failed:", err) return } methods := []string{} for _, p := range packages { // Get all methods in each source file. for _, f := range p.Files { for _, dec := range f.Decls { if fn, ok := dec.(*parser.FuncDecl); ok && fn.Name.IsExported() { methods = append(methods, fn.Name.String()) } } } } fmt.Println("Exported methods in package 'libs':", methods) }
Note: This approach only provides function declarations, not their implementations.
Dynamic Reflection:
Alternatively, you could use Go's reflect package at runtime to inspect the methods of a value. However, this requires having an initialized instance of the type in question.
Remember that these approaches have limitations and may not be suitable for all use cases.
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