modfile

package
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 Go to latest Published: Nov 12, 2020 License: BSD-3-Clause Imports: 13 Imported by: 1,258

Documentation

Overview

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

The go.mod syntax is described in https://golang.org/cmd/go/#hdr-The_go_mod_file.

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.

Index

Constants

This section is empty.

Variables

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

Functions

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.

Types

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 {
	Comments
	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 the data, reported in errors as being from file, into a File struct. It applies fix, if non-nil, to canonicalize all module versions found.

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

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)

func (*File) AddReplace 

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

func (*File) AddRequire 

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

func (*File) AddRetract added in v0.4.0 

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

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)

func (*File) SortBlocks 

func (f *File) SortBlocks()

type FileSyntax 

type FileSyntax struct {
	Name string // file path
	Comments
	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, removeLine 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 {
	Comments
	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 {
	Comments
	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 {
	Comments
	Start  Position
	LParen LParen
	Token  []string
	Line   []*Line
	RParen RParen
}

A LineBlock is a factored block of lines, like 

require (
	"x"
	"y"
)

func (*LineBlock) Span 

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

type Module 

type Module struct {
	Mod    module.Version
	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 {
	Comments
	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 {
	VersionInterval
	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.

Source Files

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