package go/token
A File is a handle for a file belonging to a FileSet. A File has a name, size, and line offset table.
Golang go/token.File type usage examples
Example 1:
// parse the file and in the process add it to the file set
if ast, err = parser.ParseFile(x.fset, filename, src, parser.ParseComments); err == nil {
file = x.fset.File(ast.Pos()) // ast.Pos() is inside the file
return
}
Example 2:
var funcs = template.FuncMap{
"filename": func(f *ast.File) string { return prog.Fset.File(f.Pos()).Name() },
"base": filepath.Base,
"stdpkg": isStandardPackage,
}
Reference :
http://golang.org/pkg/go/token/#File
