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Published: Sep 22, 2021 License: BSD-3-Clause Imports: 13 Imported by: 381



Package modfile implements a parser and formatter for go.mod files.

The go.mod syntax is described in

The Parse and ParseLax functions both parse a go.mod file and return an abstract syntax tree. ParseLax ignores unknown statements and may be used to parse go.mod files that may have been developed with newer versions of Go.

The File struct returned by Parse and ParseLax represent an abstract go.mod file. File has several methods like AddNewRequire and DropReplace that can be used to programmatically edit a file.

The Format function formats a File back to a byte slice which can be written to a file.



This section is empty.


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var GoVersionRE = lazyregexp.New(`^([1-9][0-9]*)\.(0|[1-9][0-9]*)$`)


func AutoQuote

func AutoQuote(s string) string

AutoQuote returns s or, if quoting is required for s to appear in a go.mod, the quotation of s.

func Format

func Format(f *FileSyntax) []byte

Format returns a go.mod file as a byte slice, formatted in standard style.

func IsDirectoryPath

func IsDirectoryPath(ns string) bool

IsDirectoryPath reports whether the given path should be interpreted as a directory path. Just like on the go command line, relative paths and rooted paths are directory paths; the rest are module paths.

func ModulePath

func ModulePath(mod []byte) string

ModulePath returns the module path from the gomod file text. If it cannot find a module path, it returns an empty string. It is tolerant of unrelated problems in the go.mod file.

func MustQuote

func MustQuote(s string) bool

MustQuote reports whether s must be quoted in order to appear as a single token in a go.mod line.


type Comment

type Comment struct {
	Start  Position
	Token  string // without trailing newline
	Suffix bool   // an end of line (not whole line) comment

A Comment represents a single // comment.

type CommentBlock

type CommentBlock struct {
	Start Position

A CommentBlock represents a top-level block of comments separate from any rule.

func (*CommentBlock) Span

func (x *CommentBlock) Span() (start, end Position)

type Comments

type Comments struct {
	Before []Comment // whole-line comments before this expression
	Suffix []Comment // end-of-line comments after this expression

	// For top-level expressions only, After lists whole-line
	// comments following the expression.
	After []Comment

Comments collects the comments associated with an expression.

func (*Comments) Comment

func (c *Comments) Comment() *Comments

Comment returns the receiver. This isn't useful by itself, but a Comments struct is embedded into all the expression implementation types, and this gives each of those a Comment method to satisfy the Expr interface.

type Error

type Error struct {
	Filename string
	Pos      Position
	Verb     string
	ModPath  string
	Err      error

func (*Error) Error

func (e *Error) Error() string

func (*Error) Unwrap

func (e *Error) Unwrap() error

type ErrorList added in v0.3.0

type ErrorList []Error

func (ErrorList) Error added in v0.3.0

func (e ErrorList) Error() string

type Exclude

type Exclude struct {
	Mod    module.Version
	Syntax *Line

An Exclude is a single exclude statement.

type Expr

type Expr interface {
	// Span returns the start and end position of the expression,
	// excluding leading or trailing comments.
	Span() (start, end Position)

	// Comment returns the comments attached to the expression.
	// This method would normally be named 'Comments' but that
	// would interfere with embedding a type of the same name.
	Comment() *Comments

An Expr represents an input element.

type File

type File struct {
	Module  *Module
	Go      *Go
	Require []*Require
	Exclude []*Exclude
	Replace []*Replace
	Retract []*Retract

	Syntax *FileSyntax

A File is the parsed, interpreted form of a go.mod file.

func Parse

func Parse(file string, data []byte, fix VersionFixer) (*File, error)

Parse parses and returns a go.mod file.

file is the name of the file, used in positions and errors.

data is the content of the file.

fix is an optional function that canonicalizes module versions. If fix is nil, all module versions must be canonical (module.CanonicalVersion must return the same string).

func ParseLax

func ParseLax(file string, data []byte, fix VersionFixer) (*File, error)

ParseLax is like Parse but ignores unknown statements. It is used when parsing go.mod files other than the main module, under the theory that most statement types we add in the future will only apply in the main module, like exclude and replace, and so we get better gradual deployments if old go commands simply ignore those statements when found in go.mod files in dependencies.

func (*File) AddComment

func (f *File) AddComment(text string)

func (*File) AddExclude

func (f *File) AddExclude(path, vers string) error

AddExclude adds a exclude statement to the mod file. Errors if the provided version is not a canonical version string

func (*File) AddGoStmt

func (f *File) AddGoStmt(version string) error

func (*File) AddModuleStmt

func (f *File) AddModuleStmt(path string) error

func (*File) AddNewRequire

func (f *File) AddNewRequire(path, vers string, indirect bool)

AddNewRequire adds a new require line for path at version vers at the end of the last require block, regardless of any existing require lines for path.

func (*File) AddReplace

func (f *File) AddReplace(oldPath, oldVers, newPath, newVers string) error

func (*File) AddRequire

func (f *File) AddRequire(path, vers string) error

AddRequire sets the first require line for path to version vers, preserving any existing comments for that line and removing all other lines for path.

If no line currently exists for path, AddRequire adds a new line at the end of the last require block.

func (*File) AddRetract added in v0.4.0

func (f *File) AddRetract(vi VersionInterval, rationale string) error

AddRetract adds a retract statement to the mod file. Errors if the provided version interval does not consist of canonical version strings

func (*File) Cleanup

func (f *File) Cleanup()

Cleanup cleans up the file f after any edit operations. To avoid quadratic behavior, modifications like DropRequire clear the entry but do not remove it from the slice. Cleanup cleans out all the cleared entries.

func (*File) DropExclude

func (f *File) DropExclude(path, vers string) error

func (*File) DropReplace

func (f *File) DropReplace(oldPath, oldVers string) error

func (*File) DropRequire

func (f *File) DropRequire(path string) error

func (*File) DropRetract added in v0.4.0

func (f *File) DropRetract(vi VersionInterval) error

func (*File) Format

func (f *File) Format() ([]byte, error)

func (*File) SetRequire

func (f *File) SetRequire(req []*Require)

SetRequire updates the requirements of f to contain exactly req, preserving the existing block structure and line comment contents (except for 'indirect' markings) for the first requirement on each named module path.

The Syntax field is ignored for the requirements in req.

Any requirements not already present in the file are added to the block containing the last require line.

The requirements in req must specify at most one distinct version for each module path.

If any existing requirements may be removed, the caller should call Cleanup after all edits are complete.

func (*File) SetRequireSeparateIndirect added in v0.5.0

func (f *File) SetRequireSeparateIndirect(req []*Require)

SetRequireSeparateIndirect updates the requirements of f to contain the given requirements. Comment contents (except for 'indirect' markings) are retained from the first existing requirement for each module path. Like SetRequire, SetRequireSeparateIndirect adds requirements for new paths in req, updates the version and "// indirect" comment on existing requirements, and deletes requirements on paths not in req. Existing duplicate requirements are deleted.

As its name suggests, SetRequireSeparateIndirect puts direct and indirect requirements into two separate blocks, one containing only direct requirements, and the other containing only indirect requirements. SetRequireSeparateIndirect may move requirements between these two blocks when their indirect markings change. However, SetRequireSeparateIndirect won't move requirements from other blocks, especially blocks with comments.

If the file initially has one uncommented block of requirements, SetRequireSeparateIndirect will split it into a direct-only and indirect-only block. This aids in the transition to separate blocks.

func (*File) SortBlocks

func (f *File) SortBlocks()

type FileSyntax

type FileSyntax struct {
	Name string // file path
	Stmt []Expr

A FileSyntax represents an entire go.mod file.

func (*FileSyntax) Cleanup

func (x *FileSyntax) Cleanup()

Cleanup cleans up the file syntax x after any edit operations. To avoid quadratic behavior, (*Line).markRemoved marks the line as dead by setting line.Token = nil but does not remove it from the slice in which it appears. After edits have all been indicated, calling Cleanup cleans out the dead lines.

func (*FileSyntax) Span

func (x *FileSyntax) Span() (start, end Position)

type Go

type Go struct {
	Version string // "1.23"
	Syntax  *Line

A Go is the go statement.

type LParen

type LParen struct {
	Pos Position

An LParen represents the beginning of a parenthesized line block. It is a place to store suffix comments.

func (*LParen) Span

func (x *LParen) Span() (start, end Position)

type Line

type Line struct {
	Start   Position
	Token   []string
	InBlock bool
	End     Position

A Line is a single line of tokens.

func (*Line) Span

func (x *Line) Span() (start, end Position)

type LineBlock

type LineBlock struct {
	Start  Position
	LParen LParen
	Token  []string
	Line   []*Line
	RParen RParen

A LineBlock is a factored block of lines, like

require (

func (*LineBlock) Span

func (x *LineBlock) Span() (start, end Position)

type Module

type Module struct {
	Mod        module.Version
	Deprecated string
	Syntax     *Line

A Module is the module statement.

type Position

type Position struct {
	Line     int // line in input (starting at 1)
	LineRune int // rune in line (starting at 1)
	Byte     int // byte in input (starting at 0)

A Position describes an arbitrary source position in a file, including the file, line, column, and byte offset.

type RParen

type RParen struct {
	Pos Position

An RParen represents the end of a parenthesized line block. It is a place to store whole-line (before) comments.

func (*RParen) Span

func (x *RParen) Span() (start, end Position)

type Replace

type Replace struct {
	Old    module.Version
	New    module.Version
	Syntax *Line

A Replace is a single replace statement.

type Require

type Require struct {
	Mod      module.Version
	Indirect bool // has "// indirect" comment
	Syntax   *Line

A Require is a single require statement.

type Retract added in v0.4.0

type Retract struct {
	Rationale string
	Syntax    *Line

A Retract is a single retract statement.

type VersionFixer

type VersionFixer func(path, version string) (string, error)

type VersionInterval added in v0.4.0

type VersionInterval struct {
	Low, High string

A VersionInterval represents a range of versions with upper and lower bounds. Intervals are closed: both bounds are included. When Low is equal to High, the interval may refer to a single version ('v1.2.3') or an interval ('[v1.2.3, v1.2.3]'); both have the same representation.

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