Golang go/ast.FilterPackage() function example
package go/ast
FilterPackage trims the AST for a Go package in place by removing all names from top-level declarations (including struct field and interface method names, but not from parameter lists) that don't pass through the filter f. If the declaration is empty afterwards, the declaration is removed from the AST. The pkg.Files list is not changed, so that file names and top-level package comments don't get lost.
FilterPackage returns true if there are any top-level declarations left after filtering; it returns false otherwise.
Golang go/ast.FilterPackage() function usage
func makeRx(names []string) (*regexp.Regexp, error) {
if len(names) == 0 {
return nil, fmt.Errorf("no expression provided")
}
s := ""
for i, name := range names {
if i > 0 {
s += "|"
}
if isRegexp(name) {
s += name
} else {
s += "^" + name + "$" // must match exactly
}
}
return regexp.Compile(s)
}
func main() {
var astFile *ast.File
var dirname string
...
pkgName := astFile.Name.Name
if pkgName == "main" {
return
}
pkgPath := strings.TrimPrefix(strings.TrimPrefix(dirname, "/src/"), "pkg/")
astPkg := ast.Package{
Name: pkgName,
Files: map[string]*ast.File{
filename: astFile,
},
}
rx, _ := makeRx(args)
filter := func(s string) bool { return rx.MatchString(s) }
ast.FilterPackage(&astPkg, filter) // <-- here
...
}
References :
https://github.com/fzipp/pythia/blob/master/third_party/go.tools/godoc/cmdline.go
Advertisement
Something interesting
Tutorials
+15.8k Golang : How to login and logout with JWT example
+22.2k Golang : Convert seconds to minutes and remainder seconds
+8.2k Golang : Get final or effective URL with Request.URL example
+15.4k Golang : invalid character ',' looking for beginning of value
+9.8k Golang : Resumable upload to Google Drive(RESTful) example
+8.5k Android Studio : Import third-party library or package into Gradle Scripts
+16.5k Golang : Execute terminal command to remote machine example
+5.9k Golang : Generate multiplication table from an integer example
+8.3k Useful methods to access blocked websites
+32.5k Golang : Copy directory - including sub-directories and files
+5.3k Python : Convert(cast) string to bytes example
+28.7k Golang : Detect (OS) Operating System