bf

Documentation

Overview

Package bf parses Brainfuck source files.

Index

• type Lexer
  • func NewLexer(file *token.File, src []byte) *Lexer
  • func (l *Lexer) NextToken() (*Token, error)
• type Program
  • func (p *Program) LowerIR() (*ir.Program, []error)
  • func (p *Program) String() string
• type Token
  • func LexTokens(file *token.File, src []byte) ([]*Token, error)
• type Type
  • func (typ Type) String() string
  • func (typ Type) StringBF() string

Types

type Lexer

type Lexer struct {
	// contains filtered or unexported fields
}

Lexer scans tokens in Brainfuck source.

func NewLexer

func NewLexer(file *token.File, src []byte) *Lexer

NewLexer constructs a Brainfuck lexer.

func (*Lexer) NextToken

func (l *Lexer) NextToken() (*Token, error)

NextToken scans a single Brainfuck token.

type Program

type Program struct {
	Tokens []*Token
	File   *token.File
}

Program is a sequence of Brainfuck tokens with file information.

func (*Program) LowerIR

func (p *Program) LowerIR() (*ir.Program, []error)

LowerIR lowers a Brainfuck program to Nebula IR in SSA form.

func (*Program) String

func (p *Program) String() string

type Token

type Token struct {
	Type Type
	Pos  token.Pos
}

Token is a lexical token in Brainfuck.

func LexTokens

func LexTokens(file *token.File, src []byte) ([]*Token, error)

LexTokens scans a Brainfuck source files into tokens.

type Type

type Type uint8

Type is the instruction type of a Brainfuck token.

const (
	Illegal    Type = iota
	IncPtr          // >
	DecPtr          // <
	IncData         // +
	DecData         // -
	Print           // .
	Read            // ,
	Bracket         // [
	EndBracket      // ]
)

Instruction types.

func (Type) String

func (typ Type) String() string

func (Type) StringBF

func (typ Type) StringBF() string

StringBF formats the instruction type as Brainfuck syntax.