vm

Documentation

Overview

Package vm implements the GPeg virtual machine.

Index

• type Code
  • func Encode(insns isa.Program) Code
  • func FromBytes(b []byte) (Code, error)
  • func FromJson(b []byte) (Code, error)
  • func (vm *Code) Exec(r io.ReaderAt, memtbl memo.Table) (bool, int, *memo.Capture, []ParseError)
  • func (vm *Code) ExecInterval(r io.ReaderAt, memtbl memo.Table, intrvl *Interval) (bool, int, *memo.Capture, []ParseError)
  • func (c *Code) Size() int
  • func (c *Code) ToBytes() ([]byte, error)
  • func (c *Code) ToJson() ([]byte, error)
• type Interval
• type ParseError
  • func (e ParseError) Error() string

Types

type Code

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

Code is the representation of VM bytecode.

func Encode

func Encode(insns isa.Program) Code

Encode transforms a program into VM bytecode.

func FromBytes

func FromBytes(b []byte) (Code, error)

FromBytes loads a Code from a compressed and serialized object.

func FromJson

func FromJson(b []byte) (Code, error)

FromJson returns a Code loaded from JSON form.

func (*Code) Exec

func (vm *Code) Exec(r io.ReaderAt, memtbl memo.Table) (bool, int, *memo.Capture, []ParseError)

Exec executes the parsing program this virtual machine was created with. It returns whether the parse was a match, the last position in the subject string that was matched, and any captures that were created.

func (*Code) ExecInterval

func (vm *Code) ExecInterval(r io.ReaderAt, memtbl memo.Table, intrvl *Interval) (bool, int, *memo.Capture, []ParseError)

func (*Code) Size

func (c *Code) Size() int

Size returns the size of the encoded instructions.

func (*Code) ToBytes

func (c *Code) ToBytes() ([]byte, error)

ToBytes serializes and compresses this Code.

func (*Code) ToJson

func (c *Code) ToJson() ([]byte, error)

ToJson returns this Code serialized to JSON form.

type Interval

type Interval struct {
	Low, High int
}

type ParseError

type ParseError struct {
	Message string
	Pos     int
}

func (ParseError) Error

func (e ParseError) Error() string