ast

package
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 Go to latest Published: Nov 3, 2022 License: Apache-2.0 Imports: 8 Imported by: 0

Documentation ¶

Overview ¶

Package ast declares the types used to represent syntax trees for CUE packages.

Index ¶

Constants ¶

This section is empty.

Variables ¶

View Source 
var ErrIsExpression = errors.New("not a concrete label")

ErrIsExpression reports whether a label is an expression. This error is never returned directly. Use errors.Is.

Functions ¶

func AddComment ¶ 

func AddComment(n Node, cg *CommentGroup)

AddComment adds the given comment to the node if it supports it. If a node does not support comments, such as for CommentGroup or Comment, this call has no effect.

func Embed ¶ 

func Embed(x Expr) *embedding

Embed can be used in conjunction with NewStruct to embed values.

func IsValidIdent ¶ 

func IsValidIdent(ident string) bool

IsValidIdent reports whether str is a valid identifier.

func LabelName ¶ 

func LabelName(l Label) (name string, isIdent bool, err error)

LabelName reports the name of a label, whether it is an identifier (it binds a value to a scope), and whether it is valid. Keywords that are allowed in label positions are interpreted accordingly.

Examples: 

Label   Result
foo     "foo"  true   nil
true    "true" true   nil
"foo"   "foo"  false  nil
"x-y"   "x-y"  false  nil
"foo    ""     false  invalid string
"\(x)"  ""     false  errors.Is(err, ErrIsExpression)
X=foo   "foo"  true   nil

func Name ¶ 

func Name(n Node) string

Name describes the type of n.

func ParseIdent deprecated 

func ParseIdent(n *Ident) (string, error)

ParseIdent unquotes a possibly quoted identifier and validates if the result is valid.

Deprecated: quoted identifiers are deprecated. Use aliases.

func SetComments ¶ 

func SetComments(n Node, cgs []*CommentGroup)

SetComments replaces all comments of n with the given set of comments. If a node does not support comments, such as for CommentGroup or Comment, this call has no effect.

func SetPos ¶ 

func SetPos(n Node, p token.Pos)

SetPos sets a node to the given position, if possible.

func SetRelPos ¶ 

func SetRelPos(n Node, p token.RelPos)

SetRelPos sets the relative position of a node without modifying its file position. Setting it to token.NoRelPos allows a node to adopt default formatting.

func Walk ¶ 

func Walk(node Node, before func(Node) bool, after func(Node))

Walk traverses an AST in depth-first order: It starts by calling f(node); node must not be nil. If before returns true, Walk invokes f recursively for each of the non-nil children of node, followed by a call of after. Both functions may be nil. If before is nil, it is assumed to always return true.

Types ¶

type Alias ¶ 

type Alias struct {
	Ident *Ident    // field name, always an Ident
	Equal token.Pos // position of "="
	Expr  Expr      // An Ident or SelectorExpr
	// contains filtered or unexported fields
}

An Alias binds another field to the alias name in the current struct.

func (*Alias) AddComment ¶ 

func (c *Alias) AddComment(cg *CommentGroup)

func (*Alias) Comments ¶ 

func (c *Alias) Comments() []*CommentGroup

func (*Alias) End ¶ 

func (a *Alias) End() token.Pos

func (*Alias) Pos ¶ 

func (a *Alias) Pos() token.Pos

func (*Alias) SetComments ¶ 

func (c *Alias) SetComments(cgs []*CommentGroup)

type Attribute ¶ 

type Attribute struct {
	At   token.Pos
	Text string // must be a valid attribute format.
	// contains filtered or unexported fields
}

An Attribute provides meta data about a field.

func (*Attribute) AddComment ¶ 

func (c *Attribute) AddComment(cg *CommentGroup)

func (*Attribute) Comments ¶ 

func (c *Attribute) Comments() []*CommentGroup

func (*Attribute) End ¶ 

func (a *Attribute) End() token.Pos

func (*Attribute) Pos ¶ 

func (a *Attribute) Pos() token.Pos

func (*Attribute) SetComments ¶ 

func (c *Attribute) SetComments(cgs []*CommentGroup)

func (*Attribute) Split ¶ 

func (a *Attribute) Split() (key, body string)

type BadDecl ¶ 

type BadDecl struct {
	From, To token.Pos // position range of bad declaration
	// contains filtered or unexported fields
}

A BadDecl node is a placeholder for declarations containing syntax errors for which no correct declaration nodes can be created.

func (*BadDecl) AddComment ¶ 

func (c *BadDecl) AddComment(cg *CommentGroup)

func (*BadDecl) Comments ¶ 

func (c *BadDecl) Comments() []*CommentGroup

func (*BadDecl) End ¶ 

func (d *BadDecl) End() token.Pos

func (*BadDecl) Pos ¶ 

func (d *BadDecl) Pos() token.Pos

func (*BadDecl) SetComments ¶ 

func (c *BadDecl) SetComments(cgs []*CommentGroup)

type BadExpr ¶ 

type BadExpr struct {
	From, To token.Pos // position range of bad expression
	// contains filtered or unexported fields
}

A BadExpr node is a placeholder for expressions containing syntax errors for which no correct expression nodes can be created. This is different from an ErrorExpr which represents an explicitly marked error in the source.

func (*BadExpr) AddComment ¶ 

func (c *BadExpr) AddComment(cg *CommentGroup)

func (*BadExpr) Comments ¶ 

func (c *BadExpr) Comments() []*CommentGroup

func (*BadExpr) End ¶ 

func (x *BadExpr) End() token.Pos

func (*BadExpr) Pos ¶ 

func (x *BadExpr) Pos() token.Pos

func (*BadExpr) SetComments ¶ 

func (c *BadExpr) SetComments(cgs []*CommentGroup)

type BasicLit ¶ 

type BasicLit struct {
	ValuePos token.Pos   // literal position
	Kind     token.Token // INT, FLOAT, DURATION, or STRING
	Value    string      // literal string; e.g. 42, 0x7f, 3.14, 1_234_567, 1e-9, 2.4i, 'a', '\x7f', "foo", or '\m\n\o'
	// contains filtered or unexported fields
}

A BasicLit node represents a literal of basic type.

func NewBool ¶ 

func NewBool(b bool) *BasicLit

NewBool creates a new BasicLit with a bool value without position. Useful for ASTs generated by code other than the CUE parser.

func NewLit ¶ 

func NewLit(tok token.Token, s string) *BasicLit

NewLit creates a new BasicLit with from a token type and string without position. Useful for ASTs generated by code other than the CUE parser.

func NewNull ¶ 

func NewNull() *BasicLit

NewNull creates a new BasicLit configured to be a null value. Useful for ASTs generated by code other than the CUE parser.

func NewString ¶ 

func NewString(str string) *BasicLit

NewString creates a new BasicLit with a string value without position. It quotes the given string. Useful for ASTs generated by code other than the CUE parser.

func (*BasicLit) AddComment ¶ 

func (c *BasicLit) AddComment(cg *CommentGroup)

func (*BasicLit) Comments ¶ 

func (c *BasicLit) Comments() []*CommentGroup

func (*BasicLit) End ¶ 

func (x *BasicLit) End() token.Pos

func (*BasicLit) Pos ¶ 

func (x *BasicLit) Pos() token.Pos

func (*BasicLit) SetComments ¶ 

func (c *BasicLit) SetComments(cgs []*CommentGroup)

type BinaryExpr ¶ 

type BinaryExpr struct {
	X     Expr        // left operand
	OpPos token.Pos   // position of Op
	Op    token.Token // operator
	Y     Expr        // right operand
	// contains filtered or unexported fields
}

A BinaryExpr node represents a binary expression.

func (*BinaryExpr) AddComment ¶ 

func (c *BinaryExpr) AddComment(cg *CommentGroup)

func (*BinaryExpr) Comments ¶ 

func (c *BinaryExpr) Comments() []*CommentGroup

func (*BinaryExpr) End ¶ 

func (x *BinaryExpr) End() token.Pos

func (*BinaryExpr) Pos ¶ 

func (x *BinaryExpr) Pos() token.Pos

func (*BinaryExpr) SetComments ¶ 

func (c *BinaryExpr) SetComments(cgs []*CommentGroup)

type BottomLit ¶ 

type BottomLit struct {
	Bottom token.Pos
	// contains filtered or unexported fields
}

A BottomLit indicates an error.

func (*BottomLit) AddComment ¶ 

func (c *BottomLit) AddComment(cg *CommentGroup)

func (*BottomLit) Comments ¶ 

func (c *BottomLit) Comments() []*CommentGroup

func (*BottomLit) End ¶ 

func (x *BottomLit) End() token.Pos

func (*BottomLit) Pos ¶ 

func (x *BottomLit) Pos() token.Pos

func (*BottomLit) SetComments ¶ 

func (c *BottomLit) SetComments(cgs []*CommentGroup)

type CallExpr ¶ 

type CallExpr struct {
	Fun    Expr      // function expression
	Lparen token.Pos // position of "("
	Args   []Expr    // function arguments; or nil
	Rparen token.Pos // position of ")"
	// contains filtered or unexported fields
}

A CallExpr node represents an expression followed by an argument list.

func NewCall ¶ 

func NewCall(fun Expr, args ...Expr) *CallExpr

NewCall creates a new CallExpr. Useful for ASTs generated by code other than the CUE parser.

func (*CallExpr) AddComment ¶ 

func (c *CallExpr) AddComment(cg *CommentGroup)

func (*CallExpr) Comments ¶ 

func (c *CallExpr) Comments() []*CommentGroup

func (*CallExpr) End ¶ 

func (x *CallExpr) End() token.Pos

func (*CallExpr) Pos ¶ 

func (x *CallExpr) Pos() token.Pos

func (*CallExpr) SetComments ¶ 

func (c *CallExpr) SetComments(cgs []*CommentGroup)

type Clause ¶ 

type Clause interface {
	Node
	// contains filtered or unexported methods
}

Clause nodes are part of comprehensions.

type Comment ¶ 

type Comment struct {
	Slash token.Pos // position of "/" starting the comment
	Text  string    // comment text (excluding '\n' for //-style comments)
}

A Comment node represents a single //-style or /*-style comment.

func (*Comment) AddComment ¶ 

func (c *Comment) AddComment(*CommentGroup)

func (*Comment) Comments ¶ 

func (c *Comment) Comments() []*CommentGroup

func (*Comment) End ¶ 

func (c *Comment) End() token.Pos

func (*Comment) Pos ¶ 

func (c *Comment) Pos() token.Pos

type CommentGroup ¶ 

type CommentGroup struct {
	// TODO: remove and use the token position of the first comment.
	Doc  bool
	Line bool // true if it is on the same line as the node's end pos.

	// Position indicates where a comment should be attached if a node has
	// multiple tokens. 0 means before the first token, 1 means before the
	// second, etc. For instance, for a field, the positions are:
	//    <0> Label <1> ":" <2> Expr <3> "," <4>
	Position int8
	List     []*Comment // len(List) > 0
	// contains filtered or unexported fields
}

A CommentGroup represents a sequence of comments with no other tokens and no empty lines between.

func Comments ¶ 

func Comments(n Node) []*CommentGroup

Comments returns all comments associated with a given node.

func (*CommentGroup) AddComment ¶ 

func (g *CommentGroup) AddComment(*CommentGroup)

func (*CommentGroup) Comments ¶ 

func (g *CommentGroup) Comments() []*CommentGroup

func (*CommentGroup) End ¶ 

func (g *CommentGroup) End() token.Pos

func (*CommentGroup) Pos ¶ 

func (g *CommentGroup) Pos() token.Pos

func (*CommentGroup) Text ¶ 

func (g *CommentGroup) Text() string

Text returns the text of the comment. Comment markers (//, /*, and */), the first space of a line comment, and leading and trailing empty lines are removed. Multiple empty lines are reduced to one, and trailing space on lines is trimmed. Unless the result is empty, it is newline-terminated.

type Comprehension ¶ 

type Comprehension struct {
	Clauses []Clause // There must be at least one clause.
	Value   Expr     // Must be a struct TODO: change to Struct
	// contains filtered or unexported fields
}

A Comprehension node represents a comprehension declaration.

func (*Comprehension) AddComment ¶ 

func (c *Comprehension) AddComment(cg *CommentGroup)

func (*Comprehension) Comments ¶ 

func (c *Comprehension) Comments() []*CommentGroup

func (*Comprehension) End ¶ 

func (x *Comprehension) End() token.Pos

func (*Comprehension) Pos ¶ 

func (x *Comprehension) Pos() token.Pos

func (*Comprehension) SetComments ¶ 

func (c *Comprehension) SetComments(cgs []*CommentGroup)

type Decl ¶ 

type Decl interface {
	Node
	// contains filtered or unexported methods
}

A Decl node is implemented by all declarations.

type Ellipsis ¶ 

type Ellipsis struct {
	Ellipsis token.Pos // open list if set
	Type     Expr      // type for the remaining elements
	// contains filtered or unexported fields
}

func (*Ellipsis) AddComment ¶ 

func (c *Ellipsis) AddComment(cg *CommentGroup)

func (*Ellipsis) Comments ¶ 

func (c *Ellipsis) Comments() []*CommentGroup

func (*Ellipsis) End ¶ 

func (x *Ellipsis) End() token.Pos

func (*Ellipsis) Pos ¶ 

func (x *Ellipsis) Pos() token.Pos

func (*Ellipsis) SetComments ¶ 

func (c *Ellipsis) SetComments(cgs []*CommentGroup)

type EmbedDecl ¶ 

type EmbedDecl struct {
	Expr Expr
	// contains filtered or unexported fields
}

An EmbedDecl node represents a single expression used as a declaration. The expressions in this declaration is what will be emitted as configuration output.

An EmbedDecl may only appear at the top level.

func (*EmbedDecl) AddComment ¶ 

func (c *EmbedDecl) AddComment(cg *CommentGroup)

func (*EmbedDecl) Comments ¶ 

func (c *EmbedDecl) Comments() []*CommentGroup

func (*EmbedDecl) End ¶ 

func (d *EmbedDecl) End() token.Pos

func (*EmbedDecl) Pos ¶ 

func (d *EmbedDecl) Pos() token.Pos

func (*EmbedDecl) SetComments ¶ 

func (c *EmbedDecl) SetComments(cgs []*CommentGroup)

type Expr ¶ 

type Expr interface {
	Node
	// contains filtered or unexported methods
}

An Expr is implemented by all expression nodes.

func NewBinExpr ¶ 

func NewBinExpr(op token.Token, operands ...Expr) Expr

NewBinExpr creates for list of expressions of length 2 or greater a chained binary expression of the form (((x1 op x2) op x3) ...). For lists of length 1 it returns the expression itself. It panics for empty lists. Useful for ASTs generated by code other than the CUE parser.

func NewSel ¶ 

func NewSel(x Expr, sel ...string) Expr

NewSel creates a sequence of selectors. Useful for ASTs generated by code other than the CUE parser.

type Field ¶ 

type Field struct {
	Label    Label // must have at least one element.
	Optional token.Pos

	// No TokenPos: Value must be an StructLit with one field.
	TokenPos token.Pos
	Token    token.Token // ':' or '::', ILLEGAL implies ':'

	Value Expr // the value associated with this field.

	Attrs []*Attribute
	// contains filtered or unexported fields
}

A Field represents a field declaration in a struct.

func (*Field) AddComment ¶ 

func (c *Field) AddComment(cg *CommentGroup)

func (*Field) Comments ¶ 

func (c *Field) Comments() []*CommentGroup

func (*Field) End ¶ 

func (d *Field) End() token.Pos

func (*Field) Pos ¶ 

func (d *Field) Pos() token.Pos

func (*Field) SetComments ¶ 

func (c *Field) SetComments(cgs []*CommentGroup)

type File ¶ 

type File struct {
	Filename string
	Decls    []Decl // top-level declarations; or nil

	Imports    []*ImportSpec // imports in this file
	Unresolved []*Ident      // unresolved identifiers in this file
	// contains filtered or unexported fields
}

A File node represents a Go source file.

The Comments list contains all comments in the source file in order of appearance, including the comments that are pointed to from other nodes via Doc and Comment fields.

func (*File) AddComment ¶ 

func (c *File) AddComment(cg *CommentGroup)

func (*File) Comments ¶ 

func (c *File) Comments() []*CommentGroup

func (*File) End ¶ 

func (f *File) End() token.Pos

func (*File) PackageName ¶ 

func (f *File) PackageName() string

PackageName returns the package name associated with this file or "" if no package is associated.

func (*File) Pos ¶ 

func (f *File) Pos() token.Pos

func (*File) Preamble ¶ 

func (f *File) Preamble() []Decl

Preamble returns the declarations of the preamble.

func (*File) SetComments ¶ 

func (c *File) SetComments(cgs []*CommentGroup)

func (*File) VisitImports ¶ 

func (f *File) VisitImports(fn func(d *ImportDecl))

type ForClause ¶ 

type ForClause struct {
	For token.Pos
	Key *Ident // allow pattern matching?
	// TODO: change to Comma
	Colon  token.Pos
	Value  *Ident // allow pattern matching?
	In     token.Pos
	Source Expr
	// contains filtered or unexported fields
}

A ForClause node represents a for clause in a comprehension.

func (*ForClause) AddComment ¶ 

func (c *ForClause) AddComment(cg *CommentGroup)

func (*ForClause) Comments ¶ 

func (c *ForClause) Comments() []*CommentGroup

func (*ForClause) End ¶ 

func (x *ForClause) End() token.Pos

func (*ForClause) Pos ¶ 

func (x *ForClause) Pos() token.Pos

func (*ForClause) SetComments ¶ 

func (c *ForClause) SetComments(cgs []*CommentGroup)

type Ident ¶ 

type Ident struct {
	NamePos token.Pos // identifier position

	// This LHS path element may be an identifier. Possible forms:
	//  foo:    a normal identifier
	//  "foo":  JSON compatible
	Name string

	Scope Node // scope in which node was found or nil if referring directly
	Node  Node
	// contains filtered or unexported fields
}

An Ident node represents an left-hand side identifier.

func NewIdent ¶ 

func NewIdent(name string) *Ident

NewIdent creates a new Ident without position. Useful for ASTs generated by code other than the CUE parser.

func (*Ident) AddComment ¶ 

func (c *Ident) AddComment(cg *CommentGroup)

func (*Ident) Comments ¶ 

func (c *Ident) Comments() []*CommentGroup

func (*Ident) End ¶ 

func (x *Ident) End() token.Pos

func (*Ident) Pos ¶ 

func (x *Ident) Pos() token.Pos

func (*Ident) SetComments ¶ 

func (c *Ident) SetComments(cgs []*CommentGroup)

func (*Ident) String ¶ 

func (id *Ident) String() string

type IfClause ¶ 

type IfClause struct {
	If        token.Pos
	Condition Expr
	// contains filtered or unexported fields
}

A IfClause node represents an if guard clause in a comprehension.

func (*IfClause) AddComment ¶ 

func (c *IfClause) AddComment(cg *CommentGroup)

func (*IfClause) Comments ¶ 

func (c *IfClause) Comments() []*CommentGroup

func (*IfClause) End ¶ 

func (x *IfClause) End() token.Pos

func (*IfClause) Pos ¶ 

func (x *IfClause) Pos() token.Pos

func (*IfClause) SetComments ¶ 

func (c *IfClause) SetComments(cgs []*CommentGroup)

type ImportDecl ¶ 

type ImportDecl struct {
	Import token.Pos
	Lparen token.Pos // position of '(', if any
	Specs  []*ImportSpec
	Rparen token.Pos // position of ')', if any
	// contains filtered or unexported fields
}

A ImportDecl node represents a series of import declarations. A valid Lparen position (Lparen.Line > 0) indicates a parenthesized declaration.

func (*ImportDecl) AddComment ¶ 

func (c *ImportDecl) AddComment(cg *CommentGroup)

func (*ImportDecl) Comments ¶ 

func (c *ImportDecl) Comments() []*CommentGroup

func (*ImportDecl) End ¶ 

func (d *ImportDecl) End() token.Pos

func (*ImportDecl) Pos ¶ 

func (d *ImportDecl) Pos() token.Pos

func (*ImportDecl) SetComments ¶ 

func (c *ImportDecl) SetComments(cgs []*CommentGroup)

type ImportSpec ¶ 

type ImportSpec struct {
	Name   *Ident    // local package name (including "."); or nil
	Path   *BasicLit // import path
	EndPos token.Pos // end of spec (overrides Path.Pos if nonzero)
	// contains filtered or unexported fields
}

An ImportSpec node represents a single package import.

func NewImport ¶ 

func NewImport(name *Ident, importPath string) *ImportSpec

func (*ImportSpec) AddComment ¶ 

func (c *ImportSpec) AddComment(cg *CommentGroup)

func (*ImportSpec) Comments ¶ 

func (c *ImportSpec) Comments() []*CommentGroup

func (*ImportSpec) End ¶ 

func (s *ImportSpec) End() token.Pos

func (*ImportSpec) Pos ¶ 

func (s *ImportSpec) Pos() token.Pos

func (*ImportSpec) SetComments ¶ 

func (c *ImportSpec) SetComments(cgs []*CommentGroup)

type IndexExpr ¶ 

type IndexExpr struct {
	X      Expr      // expression
	Lbrack token.Pos // position of "["
	Index  Expr      // index expression
	Rbrack token.Pos // position of "]"
	// contains filtered or unexported fields
}

An IndexExpr node represents an expression followed by an index.

func (*IndexExpr) AddComment ¶ 

func (c *IndexExpr) AddComment(cg *CommentGroup)

func (*IndexExpr) Comments ¶ 

func (c *IndexExpr) Comments() []*CommentGroup

func (*IndexExpr) End ¶ 

func (x *IndexExpr) End() token.Pos

func (*IndexExpr) Pos ¶ 

func (x *IndexExpr) Pos() token.Pos

func (*IndexExpr) SetComments ¶ 

func (c *IndexExpr) SetComments(cgs []*CommentGroup)

type Interpolation ¶ 

type Interpolation struct {
	Elts []Expr // interleaving of strings and expressions.
	// contains filtered or unexported fields
}

A Interpolation node represents a string or bytes interpolation.

func (*Interpolation) AddComment ¶ 

func (c *Interpolation) AddComment(cg *CommentGroup)

func (*Interpolation) Comments ¶ 

func (c *Interpolation) Comments() []*CommentGroup

func (*Interpolation) End ¶ 

func (x *Interpolation) End() token.Pos

func (*Interpolation) Pos ¶ 

func (x *Interpolation) Pos() token.Pos

func (*Interpolation) SetComments ¶ 

func (c *Interpolation) SetComments(cgs []*CommentGroup)

type Label ¶ 

type Label interface {
	Node
	// contains filtered or unexported methods
}

A Label is any production that can be used as a LHS label.

type LetClause ¶ 

type LetClause struct {
	Let   token.Pos
	Ident *Ident
	Equal token.Pos
	Expr  Expr
	// contains filtered or unexported fields
}

A LetClause node represents a let clause in a comprehension.

func (*LetClause) AddComment ¶ 

func (c *LetClause) AddComment(cg *CommentGroup)

func (*LetClause) Comments ¶ 

func (c *LetClause) Comments() []*CommentGroup

func (*LetClause) End ¶ 

func (x *LetClause) End() token.Pos

func (*LetClause) Pos ¶ 

func (x *LetClause) Pos() token.Pos

func (*LetClause) SetComments ¶ 

func (c *LetClause) SetComments(cgs []*CommentGroup)

type ListLit ¶ 

type ListLit struct {
	Lbrack token.Pos // position of "["

	// TODO: change to embedding or similar.
	Elts   []Expr    // list of composite elements; or nil
	Rbrack token.Pos // position of "]"
	// contains filtered or unexported fields
}

A ListLit node represents a literal list.

func NewList ¶ 

func NewList(exprs ...Expr) *ListLit

NewList creates a list of Expressions. Useful for ASTs generated by code other than the CUE parser.

func (*ListLit) AddComment ¶ 

func (c *ListLit) AddComment(cg *CommentGroup)

func (*ListLit) Comments ¶ 

func (c *ListLit) Comments() []*CommentGroup

func (*ListLit) End ¶ 

func (x *ListLit) End() token.Pos

func (*ListLit) Pos ¶ 

func (x *ListLit) Pos() token.Pos

func (*ListLit) SetComments ¶ 

func (c *ListLit) SetComments(cgs []*CommentGroup)

type Node ¶ 

type Node interface {
	Pos() token.Pos // position of first character belonging to the node
	End() token.Pos // position of first character immediately after the node

	// Deprecated: use ast.Comments
	Comments() []*CommentGroup

	// Deprecated: use ast.AddComment
	AddComment(*CommentGroup)
	// contains filtered or unexported methods
}

A Node represents any node in the abstract syntax tree.

type Package ¶ 

type Package struct {
	PackagePos token.Pos // position of "package" pseudo-keyword
	Name       *Ident    // package name
	// contains filtered or unexported fields
}

A Package represents a package clause.

func (*Package) AddComment ¶ 

func (c *Package) AddComment(cg *CommentGroup)

func (*Package) Comments ¶ 

func (c *Package) Comments() []*CommentGroup

func (*Package) End ¶ 

func (p *Package) End() token.Pos

func (*Package) Pos ¶ 

func (p *Package) Pos() token.Pos

func (*Package) SetComments ¶ 

func (c *Package) SetComments(cgs []*CommentGroup)

type ParenExpr ¶ 

type ParenExpr struct {
	Lparen token.Pos // position of "("
	X      Expr      // parenthesized expression
	Rparen token.Pos // position of ")"
	// contains filtered or unexported fields
}

A ParenExpr node represents a parenthesized expression.

func (*ParenExpr) AddComment ¶ 

func (c *ParenExpr) AddComment(cg *CommentGroup)

func (*ParenExpr) Comments ¶ 

func (c *ParenExpr) Comments() []*CommentGroup

func (*ParenExpr) End ¶ 

func (x *ParenExpr) End() token.Pos

func (*ParenExpr) Pos ¶ 

func (x *ParenExpr) Pos() token.Pos

func (*ParenExpr) SetComments ¶ 

func (c *ParenExpr) SetComments(cgs []*CommentGroup)

type SelectorExpr ¶ 

type SelectorExpr struct {
	X   Expr  // expression
	Sel Label // field selector
	// contains filtered or unexported fields
}

A SelectorExpr node represents an expression followed by a selector.

func (*SelectorExpr) AddComment ¶ 

func (c *SelectorExpr) AddComment(cg *CommentGroup)

func (*SelectorExpr) Comments ¶ 

func (c *SelectorExpr) Comments() []*CommentGroup

func (*SelectorExpr) End ¶ 

func (x *SelectorExpr) End() token.Pos

func (*SelectorExpr) Pos ¶ 

func (x *SelectorExpr) Pos() token.Pos

func (*SelectorExpr) SetComments ¶ 

func (c *SelectorExpr) SetComments(cgs []*CommentGroup)

type SliceExpr ¶ 

type SliceExpr struct {
	X      Expr      // expression
	Lbrack token.Pos // position of "["
	Low    Expr      // begin of slice range; or nil
	High   Expr      // end of slice range; or nil
	Rbrack token.Pos // position of "]"
	// contains filtered or unexported fields
}

An SliceExpr node represents an expression followed by slice indices.

func (*SliceExpr) AddComment ¶ 

func (c *SliceExpr) AddComment(cg *CommentGroup)

func (*SliceExpr) Comments ¶ 

func (c *SliceExpr) Comments() []*CommentGroup

func (*SliceExpr) End ¶ 

func (x *SliceExpr) End() token.Pos

func (*SliceExpr) Pos ¶ 

func (x *SliceExpr) Pos() token.Pos

func (*SliceExpr) SetComments ¶ 

func (c *SliceExpr) SetComments(cgs []*CommentGroup)

type Spec ¶ 

type Spec interface {
	Node
	// contains filtered or unexported methods
}

type StructLit ¶ 

type StructLit struct {
	Lbrace token.Pos // position of "{"
	Elts   []Decl    // list of elements; or nil
	Rbrace token.Pos // position of "}"
	// contains filtered or unexported fields
}

A StructLit node represents a literal struct.

func NewStruct ¶ 

func NewStruct(fields ...interface{}) *StructLit

NewStruct creates a struct from the given fields.

A field is either a *Field, an *Elipsis, *LetClause, a *CommentGroup, or a Label, optionally followed by a a token.OPTION to indicate the field is optional, optionally followed by a token.ISA to indicate the field is a definition followed by an expression for the field value.

It will panic if a values not matching these patterns are given. Useful for ASTs generated by code other than the CUE parser.

func (*StructLit) AddComment ¶ 

func (c *StructLit) AddComment(cg *CommentGroup)

func (*StructLit) Comments ¶ 

func (c *StructLit) Comments() []*CommentGroup

func (*StructLit) End ¶ 

func (x *StructLit) End() token.Pos

func (*StructLit) Pos ¶ 

func (x *StructLit) Pos() token.Pos

func (*StructLit) SetComments ¶ 

func (c *StructLit) SetComments(cgs []*CommentGroup)

type UnaryExpr ¶ 

type UnaryExpr struct {
	OpPos token.Pos   // position of Op
	Op    token.Token // operator
	X     Expr        // operand
	// contains filtered or unexported fields
}

A UnaryExpr node represents a unary expression.

func (*UnaryExpr) AddComment ¶ 

func (c *UnaryExpr) AddComment(cg *CommentGroup)

func (*UnaryExpr) Comments ¶ 

func (c *UnaryExpr) Comments() []*CommentGroup

func (*UnaryExpr) End ¶ 

func (x *UnaryExpr) End() token.Pos

func (*UnaryExpr) Pos ¶ 

func (x *UnaryExpr) Pos() token.Pos

func (*UnaryExpr) SetComments ¶ 

func (c *UnaryExpr) SetComments(cgs []*CommentGroup)

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