godef

type Config struct {
	UseOffset bool
	Context   build.Context
}

type PathError struct {
	Dir     string
	SrcDirs []string
}

type Position struct {
	Filename string // filename, if any
	Offset   int    // offset, starting at 0
	Line     int    // line number, starting at 1
	Column   int    // column number, starting at 1 (character count)
}

type Query struct {
	Mode  string         // query mode ("callers", etc)
	Pos   string         // query position
	Build *build.Context // package loading configuration

	// pointer analysis options
	Scope      []string  // main packages in (*loader.Config).FromArgs syntax
	PTALog     io.Writer // (optional) pointer-analysis log file
	Reflection bool      // model reflection soundly (currently slow).

	// Populated during Run()
	Fset *token.FileSet
	// contains filtered or unexported fields
}