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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package doc extracts source code documentation from a Go AST.
package doc
import (
// Package is the documentation for an entire package.
type Package struct {
Doc string
Name string
ImportPath string
Imports []string
Filenames []string
Notes map[string][]*Note
// Deprecated: For backward compatibility Bugs is still populated,
// but all new code should use Notes instead.
Bugs []string
// declarations
Consts []*Value
Types []*Type
Vars []*Value
Funcs []*Func
// Value is the documentation for a (possibly grouped) var or const declaration.
type Value struct {
Doc string
Names []string // var or const names in declaration order
Decl *ast.GenDecl
order int
// Type is the documentation for a type declaration.
type Type struct {
Doc string
Name string
Decl *ast.GenDecl
// associated declarations
Consts []*Value // sorted list of constants of (mostly) this type
Vars []*Value // sorted list of variables of (mostly) this type
Funcs []*Func // sorted list of functions returning this type
Methods []*Func // sorted list of methods (including embedded ones) of this type
// Func is the documentation for a func declaration.
type Func struct {
Doc string
Name string
Decl *ast.FuncDecl
// methods
// (for functions, these fields have the respective zero value)
Recv string // actual receiver "T" or "*T"
Orig string // original receiver "T" or "*T"
Level int // embedding level; 0 means not embedded
// A Note represents a marked comment starting with "MARKER(uid): note body".
// Any note with a marker of 2 or more upper case [A-Z] letters and a uid of
// at least one character is recognized. The ":" following the uid is optional.
// Notes are collected in the Package.Notes map indexed by the notes marker.
type Note struct {
Pos, End token.Pos // position range of the comment containing the marker
UID string // uid found with the marker
Body string // note body text
// Mode values control the operation of New.
type Mode int
const (
// extract documentation for all package-level declarations,
// not just exported ones
AllDecls Mode = 1 << iota
// show all embedded methods, not just the ones of
// invisible (unexported) anonymous fields
// New computes the package documentation for the given package AST.
// New takes ownership of the AST pkg and may edit or overwrite it.
func New(pkg *ast.Package, importPath string, mode Mode) *Package {
var r reader
r.readPackage(pkg, mode)
return &Package{
Doc: r.doc,
Name: pkg.Name,
ImportPath: importPath,
Imports: sortedKeys(r.imports),
Filenames: r.filenames,
Notes: r.notes,
Bugs: noteBodies(r.notes["BUG"]),
Consts: sortedValues(r.values, token.CONST),
Types: sortedTypes(r.types, mode&AllMethods != 0),
Vars: sortedValues(r.values, token.VAR),
Funcs: sortedFuncs(r.funcs, true),