dune

package module
v0.0.0-...-6c293db Latest Latest
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 Go to latest Published: Nov 25, 2021 License: BSD-2-Clause Imports: 17 Imported by: 0

README

Dune

Dune combines the simplicity, reliability and efficiency of Go with the flexibility of Typescript.

It is evolving so expect frequent breaking changes.

Download the latest release or get it from source:

go install github.com/dunelang/dune/cmd/dune@latest

REPL:

Dune v0.97

> 1 + 2
3

Create a hello.ts:

fmt.println("Hello world")

Run it:

$ dune hello.ts 
Hello world

Examples

Arrays have multiple built in functions:

let items = [1, 2, 3, 4, 5]
let r = items.where(t => t > 2).select(t => t * t).sum()
console.log(r)

A web server:

let s = http.newServer()
s.address = ":8080"
s.handler = (w, r) => w.write("Hello world")
s.start()

Working with databases:

let db = sql.open("sqlite3", ":memory:")
db.exec("CREATE TABLE people (id KEY, name TEXT)")
db.exec("INSERT INTO people (name) VALUES (?)", "Bob")
for (let r of db.query("SELECT id, name FROM people")) {
	console.log(r.id, r.name)
}

Permissions

By default a virtual machine has no access to the external world. The file system is virtual.

This code throws: unauthorized

let p = bytecode.compileStr(`http.get("http://google.com")`)
let vm = runtime.newVM(p)
vm.run()

Programs can request permissions with directives:

// [permissions networking]
http.get("http://google.com")

Execution limits:

This code throws: Step limit reached: 100

let p = bytecode.compileStr(`while(true) { }`)
let vm = runtime.newVM(p)
vm.maxSteps = 100
vm.run()

This code throws: Max stack frames reached: 5

let p = bytecode.compileStr(`function main() { main() }`)
let vm = runtime.newVM(p)
vm.maxFrames = 5
vm.run()

MaxAllocations counts the number of variables set and in the case of strings their size so it is not very useful yet. This code throws: Max allocations reached: 10

let p = bytecode.compileStr(`
	let v = "*"
	while(true) {
		v += v
	}
`)
let vm = runtime.newVM(p)
vm.maxAllocations = 10
vm.run()

Checkout more examples.

Testing

Since everything is virtual, including the file system, programs are easily testable. There is an assert package in the standard library.

Writing programs

The syntax is a subset of Typescript to get type checking, autocompletion and refactoring tools from editors like VS Code.

$ dune --init
$ code rand.ts

Write a basic program:

export function main(len?: string) {
    let n = convert.toInt(len || "15")
    let v = crypto.randomAlphanumeric(n)
    fmt.println(v)
}   

$ dune rand
1RyXuMFKwmxPbTa6bpXk

To decompile a program:

$ dune -d /tmp/rand.ts 

=============================
Functions
=============================

0F @global
-----------------------------
  0     return              --     --     --   ;   @global


1F main
-----------------------------
  0     MoveAndTest         2L     0L     3L   ;   /tmp/rand.ts:8
  1     TestJump            3L     1D     0D   ;   /tmp/rand.ts:8
  2     Move                2L     0K     --   ;   /tmp/rand.ts:8
  3     CallSingleArg      81N     1L     2L   ;   /tmp/rand.ts:8
  4     CallSingleArg     107N     4L     1L   ;   /tmp/rand.ts:9
  5     CallSingleArg     131N     --     4L   ;   /tmp/rand.ts:10
  6     Return              --     --     --   ;   /tmp/rand.ts:10

  0L len 0-6
  1L n 0-6
  2L @ 0-6
  3L @ 0-6
  4L v 4-6

=============================
Constants
=============================
0K string 15

Embedding

package main

import (
	"fmt"

	"github.com/dunelang/dune"
)

func main() {
	v, err := dune.RunStr("return 3 * 2")
	fmt.Println(v, err)
}

To call Go functions:

package main

import (
	"fmt"
	"log"

	"github.com/dunelang/dune"
)

func main() {
	dune.AddNativeFunc(dune.NativeFunction{
		Name:      "math.square",
		Arguments: 1,
		Function: func(this dune.Value, args []dune.Value, vm *dune.VM) (dune.Value, error) {
			v := args[0].ToInt()
			return dune.NewInt64(v * v), nil
		},
	})

	p, err := dune.CompileStr("return math.square(5)")
	if err != nil {
		log.Fatal(err)
	}

	v, err := dune.NewVM(p).Run()
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(v)
}

To import the standard library:

package main

import (
	"log"

	"github.com/dunelang/dune"
	_ "github.com/dunelang/dune/lib"
)

func main() {
	_, err := dune.RunStr(`
		let v = { foo: 33 }
		console.log(v)
	`)

	if err != nil {
		log.Fatal(err)
	}
}

Documentation

Index

Constants

View Source 
const GlobalNamespace = "--globalnamespace"
View Source 
const MAX_EXPORT_RECURSION = 200
View Source 
const VERSION = "0.98"

Variables

View Source 
var (
	UndefinedValue = Value{Type: Undefined}
	NullValue      = Value{Type: Null}
	TrueValue      = Value{Type: Bool, /* contains filtered or unexported fields */}
	FalseValue     = Value{Type: Bool, /* contains filtered or unexported fields */}
)
View Source 
var ErrFunctionNotExist = errors.New("function not found")
View Source 
var Void = NewAddress(AddrVoid, 0)

Functions

func AddBuiltinField 

func AddBuiltinField(name string)

func AddBuiltinFunc 

func AddBuiltinFunc(name string)

func AddNativeFunc 

func AddNativeFunc(f NativeFunction)

func Eval 

func Eval(vm *VM, code string) error

func Fprint 

func Fprint(w io.Writer, p *Program)

func FprintConstants 

func FprintConstants(w io.Writer, p *Program)

func FprintFunction 

func FprintFunction(w io.Writer, prefix string, f *Function, p *Program)

func FprintNames 

func FprintNames(w io.Writer, p *Program, registers bool)

func NewCompiler 

func NewCompiler() *compiler

func Parse 

func Parse(fs filesystem.FS, path string) (*ast.Program, error)

func ParseExpr 

func ParseExpr(code string) (ast.Expr, error)

func ParseStr 

func ParseStr(code string) (*ast.Program, error)

func Print 

func Print(p *Program)

func PrintFunction 

func PrintFunction(f *Function, p *Program)

func PrintNames 

func PrintNames(p *Program, registers bool)

func RegisterLib 

func RegisterLib(funcs []NativeFunction, dts string)

func Sprint 

func Sprint(p *Program) (string, error)

func SprintNames 

func SprintNames(p *Program, registers bool) (string, error)

func Stacktrace 

func Stacktrace() string

func TypeDefs 

func TypeDefs() string

func Wrap 

func Wrap(msg string, err error) error

Types

type Address 

type Address struct {
	Kind  AddressKind
	Value int32
}

func NewAddress 

func NewAddress(kind AddressKind, value int) *Address

func (*Address) Copy 

func (a *Address) Copy() *Address

func (*Address) Equal 

func (r *Address) Equal(b *Address) bool

func (*Address) String 

func (r *Address) String() string

type AddressKind 

type AddressKind byte
const (
	AddrVoid AddressKind = iota
	AddrLocal
	AddrGlobal
	AddrConstant
	AddrClosure
	AddrEnum
	AddrFunc
	AddrNativeFunc
	AddrClass
	AddrData
	AddrUnresolved
)

func (AddressKind) String 

func (i AddressKind) String() string

type Allocator 

type Allocator interface {
	Size() int
}

type ByPriority 

type ByPriority []ast.Stmt

func (ByPriority) Len 

func (a ByPriority) Len() int

func (ByPriority) Less 

func (a ByPriority) Less(i, j int) bool

func (ByPriority) Swap 

func (a ByPriority) Swap(i, j int)

type Callable 

type Callable interface {
	GetMethod(name string) NativeMethod
}

type Class 

type Class struct {
	Name       string
	Exported   bool
	Module     string
	Fields     []*Field
	Getters    []int
	Setters    []int
	Functions  []int
	Attributes []string
}

func (*Class) Copy 

func (c *Class) Copy() *Class

type Closure 

type Closure struct {
	FuncIndex int
	// contains filtered or unexported fields
}

func (*Closure) Export 

func (c *Closure) Export(recursionLevel int) interface{}

func (*Closure) Type 

func (c *Closure) Type() string

type Comparable 

type Comparable interface {
	Compare(Value) int
}

Comparable returns: 

-2 if both values are imcompatible for comparisson between each other.
-1 is lesser
 0 is equal
 1 is greater

type CompilerError 

type CompilerError struct {
	Pos ast.Position
	// contains filtered or unexported fields
}

func (CompilerError) Error 

func (e CompilerError) Error() string

func (CompilerError) ErrorMessage 

func (e CompilerError) ErrorMessage() string

func (CompilerError) Position 

func (e CompilerError) Position() ast.Position

type EnumList 

type EnumList struct {
	Name     string
	Module   string
	Exported bool
	Values   []*EnumValue
}

func (*EnumList) ValueByName 

func (e *EnumList) ValueByName(name string) (*EnumValue, int)

type EnumValue 

type EnumValue struct {
	Name   string
	KIndex int
}

type Enumerable 

type Enumerable interface {
	Values() ([]Value, error)
}

type Equatable 

type Equatable interface {
	Equals(interface{}) bool
}

type ErrorMessenger 

type ErrorMessenger interface {
	ErrorMessage() string
}

type Exporter 

type Exporter interface {
	Export(recursionLevel int) interface{}
}

type Field 

type Field struct {
	Name     string
	Exported bool
}

type FieldGetter 

type FieldGetter interface {
	GetField(string, *VM) (Value, error)
}

type FieldSetter 

type FieldSetter interface {
	SetField(string, Value, *VM) error
}

type Finalizable 

type Finalizable interface {
	Close() error
}

type Frame 

type Frame uintptr

Frame represents a program counter inside a stack frame.

type Function 

type Function struct {
	Name              string
	Module            string
	Variadic          bool
	Exported          bool
	IsClass           bool
	Class             int
	IsGlobal          bool
	Index             int
	Arguments         int
	OptionalArguments int
	MaxRegIndex       int
	Lambda            bool
	WrapClass         int
	Kind              FunctionKind
	Registers         []*Register
	Closures          []*Register
	Instructions      []*Instruction
	Positions         []Position
	Attributes        []string
	// contains filtered or unexported fields
}

func (*Function) Copy 

func (c *Function) Copy() *Function

func (*Function) HasPermission 

func (f *Function) HasPermission(name string) bool

func (*Function) Permissions 

func (f *Function) Permissions() []string

type FunctionKind 

type FunctionKind byte
const (
	User FunctionKind = iota
	Init
	Main
	Global
)

type IndexIterator 

type IndexIterator interface {
	IndexerGetter
	Len() int
}

type IndexerGetter 

type IndexerGetter interface {
	GetIndex(int) (Value, error)
}

type IndexerSetter 

type IndexerSetter interface {
	SetIndex(int, Value) error
}

type Instruction 

type Instruction struct {
	Opcode Opcode
	A      *Address
	B      *Address
	C      *Address
}

func NewInstruction 

func NewInstruction(op Opcode, a, b, c *Address) *Instruction

func (*Instruction) Copy 

func (r *Instruction) Copy() *Instruction

func (*Instruction) Format 

func (i *Instruction) Format(padd bool) string

func (*Instruction) String 

func (i *Instruction) String() string

type KeyGetter 

type KeyGetter interface {
	GetKey(string) (Value, error)
}

type KeyIterator 

type KeyIterator interface {
	KeyGetter
	Keys() []string
}

type Localizer 

type Localizer interface {
	Translate(language, template string) string
	Format(language, format string, v interface{}) string
	ParseNumber(v string) (float64, error)
	ParseDate(value, format string, loc *time.Location) (time.Time, error)
}

type MapValue 

type MapValue struct {
	sync.RWMutex
	Map map[Value]Value
}

type Method 

type Method struct {
	ThisObject Value
	FuncIndex  int
}

func (*Method) Export 

func (*Method) Export(recursionLevel int) interface{}

func (*Method) Type 

func (*Method) Type() string

type NamedType 

type NamedType interface {
	Type() string
}

type NativeFunction 

type NativeFunction struct {
	Name        string
	Arguments   int
	Index       int
	Permissions []string
	Function    func(this Value, args []Value, vm *VM) (Value, error)
}

NativeFunction is a function written in Go as opposed to an interpreted function

func AllNativeFuncs 

func AllNativeFuncs() []NativeFunction

func NativeFuncFromIndex 

func NativeFuncFromIndex(i int) NativeFunction

func NativeFuncFromName 

func NativeFuncFromName(name string) (NativeFunction, bool)

type NativeMethod 

type NativeMethod func(args []Value, vm *VM) (Value, error)

func (NativeMethod) Type 

func (NativeMethod) Type() string

type NativeObject 

type NativeObject interface {
	GetMethod(name string) NativeMethod
	GetField(name string, vm *VM) (Value, error)
	SetField(name string, v Value, vm *VM) error
}

type NewArrayObject 

type NewArrayObject struct {
	Array []Value
}

type Opcode 

type Opcode byte

func (Opcode) String 

func (i Opcode) String() string

type Position 

type Position struct {
	File   int
	Line   int
	Column int
}

func (Position) Copy 

func (p Position) Copy() Position

type Program 

type Program struct {
	sync.Mutex
	Enums      []*EnumList
	Functions  []*Function
	Classes    []*Class
	Constants  []Value
	Files      []string
	Attributes []string

	Resources map[string][]byte
	// contains filtered or unexported fields
}

func Compile 

func Compile(fs filesystem.FS, path string) (*Program, error)

func CompileStr 

func CompileStr(code string) (*Program, error)

func (*Program) AddPermission 

func (p *Program) AddPermission(name string)

func (*Program) Attribute 

func (p *Program) Attribute(name string) string

func (*Program) Copy 

func (p *Program) Copy() *Program

func (*Program) FileIndex 

func (p *Program) FileIndex(file string) int

func (*Program) Function 

func (p *Program) Function(name string) (*Function, bool)

func (*Program) HasPermission 

func (p *Program) HasPermission(name string) bool

func (*Program) Permissions 

func (p *Program) Permissions() []string

func (*Program) Strip 

func (p *Program) Strip()

func (*Program) ToTraceLine 

func (p *Program) ToTraceLine(f *Function, pc int) TraceLine

type Register 

type Register struct {
	Name     string
	Index    int
	StartPC  int
	EndPC    int
	Exported bool
	Module   string
	KAddress *Address
}

func (*Register) Copy 

func (r *Register) Copy() *Register

func (*Register) Equals 

func (r *Register) Equals(b *Register) bool

type StackTrace 

type StackTrace []Frame

StackTrace is stack of Frames from innermost (newest) to outermost (oldest).

type TraceLine 

type TraceLine struct {
	Function string
	File     string
	Line     int
}

func (TraceLine) SameLine 

func (p TraceLine) SameLine(o TraceLine) bool

func (TraceLine) String 

func (p TraceLine) String() string

type Type 

type Type int8
const (
	Null Type = iota
	Undefined
	Int
	Float
	Bool
	Bytes
	String
	Array
	Map
	Func
	Enum
	NativeFunc
	Rune
	Object
)

func (Type) String 

func (t Type) String() string

type VM 

type VM struct {
	Program        *Program
	MaxSteps       int64
	MaxAllocations int64
	MaxFrames      int
	RetValue       Value
	Error          error
	Context        Value
	FileSystem     filesystem.FS
	Language       string
	Localizer      Localizer
	Location       *time.Location
	Now            time.Time
	Stdin          io.Reader
	Stdout         io.Writer
	Stderr         io.Writer
	// contains filtered or unexported fields
}

func NewInitializedVM 

func NewInitializedVM(p *Program, globals []Value) *VM

func NewVM 

func NewVM(p *Program) *VM

func (*VM) AddAllocations 

func (vm *VM) AddAllocations(size int) error

func (*VM) AddSteps 

func (vm *VM) AddSteps(n int64) error

func (*VM) Allocations 

func (vm *VM) Allocations() int64

func (*VM) Clone 

func (vm *VM) Clone(p *Program) *VM

func (*VM) CloneInitialized 

func (vm *VM) CloneInitialized(p *Program, globals []Value) *VM

func (*VM) CurrentFunc 

func (vm *VM) CurrentFunc() *Function

func (*VM) FinalizeGlobals 

func (vm *VM) FinalizeGlobals()

func (*VM) GetStderr 

func (vm *VM) GetStderr() io.Writer

func (*VM) GetStdin 

func (vm *VM) GetStdin() io.Reader

func (*VM) GetStdout 

func (vm *VM) GetStdout() io.Writer

func (*VM) Globals 

func (vm *VM) Globals() []Value

func (*VM) HasPermission 

func (vm *VM) HasPermission(name string) bool

func (*VM) Initialize 

func (vm *VM) Initialize() error

func (*VM) Initialized 

func (vm *VM) Initialized() bool

func (*VM) NewCodeError 

func (vm *VM) NewCodeError(code int, format string, a ...interface{}) *VMError

func (*VM) NewError 

func (vm *VM) NewError(format string, a ...interface{}) *VMError

func (*VM) RegisterValue 

func (vm *VM) RegisterValue(name string) (Value, bool)

return a value from the current scope

func (*VM) ResetSteps 

func (vm *VM) ResetSteps()

func (*VM) Run 

func (vm *VM) Run(args ...Value) (Value, error)

func (*VM) RunClosure 

func (vm *VM) RunClosure(c *Closure, args ...Value) (Value, error)

RunClosure executes a program closure

func (*VM) RunFunc 

func (vm *VM) RunFunc(name string, args ...Value) (Value, error)

RunFunc executes a function by name

func (*VM) RunFuncIndex 

func (vm *VM) RunFuncIndex(index int, args ...Value) (Value, error)

RunFuncIndex executes a program function by index

func (*VM) RunMethod 

func (vm *VM) RunMethod(c *Method, args ...Value) (Value, error)

RunMethod executes a class method

func (*VM) SetFinalizer 

func (vm *VM) SetFinalizer(v Finalizable)

func (*VM) SetGlobalFinalizer 

func (vm *VM) SetGlobalFinalizer(v Finalizable)

func (*VM) Stacktrace 

func (vm *VM) Stacktrace() []string

func (*VM) Steps 

func (vm *VM) Steps() int64

func (*VM) WrapError 

func (vm *VM) WrapError(err error) *VMError

type VMError 

type VMError struct {
	Code       int
	Message    string
	TraceLines []TraceLine
	Wrapped    *VMError
	IsRethrow  bool
	// contains filtered or unexported fields
}

func NewCodeError 

func NewCodeError(code int, msg string, args ...interface{}) *VMError

func (*VMError) Error 

func (e *VMError) Error() string

func (*VMError) ErrorMessage 

func (e *VMError) ErrorMessage() string

func (*VMError) GetField 

func (e *VMError) GetField(name string, vm *VM) (Value, error)

func (*VMError) GetMethod 

func (e *VMError) GetMethod(name string) NativeMethod

func (*VMError) Is 

func (e *VMError) Is(msg string) bool

func (*VMError) MarshalJSON 

func (e *VMError) MarshalJSON() ([]byte, error)

func (*VMError) Stack 

func (e *VMError) Stack() string

func (*VMError) String 

func (e *VMError) String() string

func (*VMError) Type 

func (e *VMError) Type() string

type Value 

type Value struct {
	Type Type
	// contains filtered or unexported fields
}

func NewArray 

func NewArray(size int) Value

func NewArrayValues 

func NewArrayValues(v []Value) Value

func NewBool 

func NewBool(v bool) Value

func NewBytes 

func NewBytes(v []byte) Value

func NewEnum 

func NewEnum(v int) Value

func NewFloat 

func NewFloat(v float64) Value

func NewFunction 

func NewFunction(v int) Value

func NewInt 

func NewInt(v int) Value

func NewInt64 

func NewInt64(v int64) Value

func NewMap 

func NewMap(size int) Value

func NewMapValues 

func NewMapValues(m map[Value]Value) Value

func NewNativeFunction 

func NewNativeFunction(v int) Value

func NewObject 

func NewObject(v interface{}) Value

func NewRune 

func NewRune(v rune) Value

func NewString 

func NewString(v string) Value

func NewValue 

func NewValue(v interface{}) Value

func Run 

func Run(fs filesystem.FS, path string) (Value, error)

func RunStr 

func RunStr(code string) (Value, error)

func (Value) Equals 

func (v Value) Equals(other Value) bool

func (Value) Export 

func (v Value) Export(recursionLevel int) interface{}

func (Value) ExportMarshal 

func (v Value) ExportMarshal(recursionLevel int) interface{}

func (Value) IsNil 

func (v Value) IsNil() bool

func (Value) IsNilOrEmpty 

func (v Value) IsNilOrEmpty() bool

func (Value) MarshalJSON 

func (v Value) MarshalJSON() ([]byte, error)

func (Value) Size 

func (v Value) Size() int

func (Value) StrictEquals 

func (v Value) StrictEquals(other Value) bool

func (Value) String 

func (v Value) String() string

String representation for the formatter.

func (Value) ToArray 

func (v Value) ToArray() []Value

func (Value) ToArrayObject 

func (v Value) ToArrayObject() *NewArrayObject

func (Value) ToBool 

func (v Value) ToBool() bool

func (Value) ToBytes 

func (v Value) ToBytes() []byte

func (Value) ToEnum 

func (v Value) ToEnum() int

func (Value) ToFloat 

func (v Value) ToFloat() float64

func (Value) ToFunction 

func (v Value) ToFunction() int

func (Value) ToInt 

func (v Value) ToInt() int64

func (Value) ToMap 

func (v Value) ToMap() *MapValue

func (Value) ToNativeFunction 

func (v Value) ToNativeFunction() int

func (Value) ToObject 

func (v Value) ToObject() interface{}

func (Value) ToObjectOrNil 

func (v Value) ToObjectOrNil() interface{}

func (Value) ToRune 

func (v Value) ToRune() rune

func (Value) ToString 

func (v Value) ToString() string

func (Value) TypeName 

func (v Value) TypeName() string

Source Files

View all Source files

Directories

Path Synopsis
cmd
dune
lib
cache
dbx
locale
logging
sqx
templates
Package templates generates source code for templates.
 Package templates generates source code for templates.

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