item

Documentation

Overview

Package item implements a lexical dotted item

Index

• type Item
  • func From(rule *ast.LexRule, pos *pos.Pos) *Item
  • func New(rule *ast.LexRule) *Item
  • func (i *Item) Clone() *Item
  • func (i *Item) Emoves() []*Item
  • func (i *Item) Equal(other *Item) bool
  • func (i *Item) GetRegExp() *ast.RegExp
  • func (i *Item) IsReduce() bool
  • func (i *Item) Next() *Item
  • func (i *Item) String() string
  • func (i *Item) Symbol() ast.LexSymbol

Types

type Item

type Item struct {
	Rule *ast.LexRule
	Pos  *pos.Pos
}

Item contains the dotted item for one lex rule

func From

func From(rule *ast.LexRule, pos *pos.Pos) *Item

func New

func New(rule *ast.LexRule) *Item

func (*Item) Clone

func (i *Item) Clone() *Item

func (*Item) Emoves

func (i *Item) Emoves() []*Item

func (*Item) Equal

func (i *Item) Equal(other *Item) bool

Equal is true if i and other have the same rule and position.

func (*Item) GetRegExp

func (i *Item) GetRegExp() *ast.RegExp

GetRegExp returns the RegExp containing the current symbol in i. If pos.Len() > 1 this will be an alternate of a LexBracket.

func (*Item) IsReduce

func (i *Item) IsReduce() bool

IsReduce returns true if the position of i is after the last symbol of i

func (*Item) Next

func (i *Item) Next() *Item

Next returns the next item after i. If i is a reduce item Next returns nil

func (*Item) String

func (i *Item) String() string

func (*Item) Symbol

func (i *Item) Symbol() ast.LexSymbol

Symbol returns the base (not bracket) symbol after the item place marker. If i is a reduce item Symbol returns nil