doc

Documentation

Overview

Package doc extracts source code documentation from a Go AST.

Index

• Variables
• func Synopsis(s string) string
• func ToHTML(w io.Writer, text string, words map[string]string)
• func ToText(w io.Writer, text string, indent, preIndent string, width int)
• type Example
  • func Examples(files ...*ast.File) []*Example
• type Filter
• type Func
• type Mode
• type Note
• type Package
  • func New(pkg *ast.Package, importPath string, mode Mode) *Package
  • func (p *Package) Filter(f Filter)
• type Type
• type Value

Variables

var IllegalPrefixes = []string{
	"copyright",
	"all rights",
	"author",
}

Functions

func Synopsis

func Synopsis(s string) string

Synopsis returns a cleaned version of the first sentence in s. That sentence ends after the first period followed by space and not preceded by exactly one uppercase letter. The result string has no \n, \r, or \t characters and uses only single spaces between words. If s starts with any of the IllegalPrefixes, the result is the empty string.

func ToHTML

func ToHTML(w io.Writer, text string, words map[string]string)

ToHTML converts comment text to formatted HTML. The comment was prepared by DocReader, so it is known not to have leading, trailing blank lines nor to have trailing spaces at the end of lines. The comment markers have already been removed.

Each span of unindented non-blank lines is converted into a single paragraph. There is one exception to the rule: a span that consists of a single line, is followed by another paragraph span, begins with a capital letter, and contains no punctuation is formatted as a heading.

A span of indented lines is converted into a <pre> block, with the common indent prefix removed.

URLs in the comment text are converted into links; if the URL also appears in the words map, the link is taken from the map (if the corresponding map value is the empty string, the URL is not converted into a link).

Go identifiers that appear in the words map are italicized; if the corresponding map value is not the empty string, it is considered a URL and the word is converted into a link.

func ToText

func ToText(w io.Writer, text string, indent, preIndent string, width int)

ToText prepares comment text for presentation in textual output. It wraps paragraphs of text to width or fewer Unicode code points and then prefixes each line with the indent. In preformatted sections (such as program text), it prefixes each non-blank line with preIndent.

Types

type Example

type Example struct {
	Name        string // name of the item being exemplified
	Doc         string // example function doc string
	Code        ast.Node
	Play        *ast.File // a whole program version of the example
	Comments    []*ast.CommentGroup
	Output      string // expected output
	EmptyOutput bool   // expect empty output
	Order       int    // original source code order
}

An Example represents an example function found in a source files.

func Examples

func Examples(files ...*ast.File) []*Example

Examples returns the examples found in the files, sorted by Name field. The Order fields record the order in which the examples were encountered.

Playable Examples must be in a package whose name ends in "_test". An Example is "playable" (the Play field is non-nil) in either of these circumstances:

• The example function is self-contained: the function references only identifiers from other packages (or predeclared identifiers, such as "int") and the test file does not include a dot import.
• The entire test file is the example: the file contains exactly one example function, zero test or benchmark functions, and at least one top-level function, type, variable, or constant declaration other than the example function.

type Filter

type Filter func(string) bool

type Func

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
}

Func is the documentation for a func declaration.

type Mode

type Mode int

Mode values control the operation of New.

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
	AllMethods
)

type Note

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
}

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 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
}

Package is the documentation for an entire package.

func New

func New(pkg *ast.Package, importPath string, mode Mode) *Package

New computes the package documentation for the given package AST. New takes ownership of the AST pkg and may edit or overwrite it.

func (*Package) Filter

func (p *Package) Filter(f Filter)

Filter eliminates documentation for names that don't pass through the filter f. TODO(gri): Recognize "Type.Method" as a name.

type Type

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
}

Type is the documentation for a type declaration.

type Value

type Value struct {
	Doc   string
	Names []string // var or const names in declaration order
	Decl  *ast.GenDecl
	// contains filtered or unexported fields
}

Value is the documentation for a (possibly grouped) var or const declaration.