quickjs

package module
v1.1.0 Latest Latest
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 Go to latest Published: Sep 22, 2022 License: MIT Imports: 6 Imported by: 0

README

quickjs

MIT License go.dev reference

Go bindings to QuickJS: a fast, small, and embeddable ES2020 JavaScript interpreter.

These bindings are a WIP and do not match full parity with QuickJS' API, though expose just enough features to be usable.

These bindings have been tested to cross-compile and run successfully on Linux, Windows, and Mac using gcc-7 and mingw32 without any addtional compiler or linker flags.

Usage

$ go get github.com/Mori-Enterprises/quickjs-go

Guidelines

  1. Free quickjs.Runtime and quickjs.Context once you are done using them.
  2. Free quickjs.Value's returned by Eval() and EvalFile(). All other values do not need to be freed, as they get garbage-collected.
  3. You may access the stacktrace of an error returned by Eval() or EvalFile() or Call() by casting it to a *quickjs.Error.
  4. Make new copies of arguments should you want to return them in functions you created.
  5. Make sure to call runtime.LockOSThread() to ensure that QuickJS always operates in the exact same thread.
  6. Add JsInterface and JsThread for run javascript in golang goroutine

Example

The full example code below may be found by clicking here. Find more API examples here and advance use found by clicking here.

package main

import (
	"errors"
	"flag"
	"fmt"
	"github.com/Mori-Enterprises/quickjs-go"
	"strings"
)

func check(err error) {
	if err != nil {
		var evalErr *quickjs.Error
		if errors.As(err, &evalErr) {
			fmt.Println(evalErr.Cause)
			fmt.Println(evalErr.Stack)
		}
		panic(err)
	}
}

func main() {
	runtime := quickjs.NewRuntime()
	defer runtime.Free()

	context := runtime.NewContext()
	defer context.Free()

	globals := context.Globals()

	// Test evaluating template strings.

	result, err := context.Eval("`Hello world! 2 ** 8 = ${2 ** 8}.`")
	check(err)
	defer result.Free()

	fmt.Println(result.String())
	fmt.Println()

	// Test evaluating numeric expressions.

	result, err = context.Eval(`1 + 2 * 100 - 3 + Math.sin(10)`)
	check(err)
	defer result.Free()

	fmt.Println(result.Int64())
	fmt.Println()

	// Test evaluating big integer expressions.

	result, err = context.Eval(`128n ** 16n`)
	check(err)
	defer result.Free()

	fmt.Println(result.BigInt())
	fmt.Println()

	// Test evaluating big decimal expressions.

	result, err = context.Eval(`128l ** 12l`)
	check(err)
	defer result.Free()

	fmt.Println(result.BigFloat())
	fmt.Println()

	// Test evaluating boolean expressions.

	result, err = context.Eval(`false && true`)
	check(err)
	defer result.Free()

	fmt.Println(result.Bool())
	fmt.Println()

	// Test setting and calling functions.

	A := func(ctx *quickjs.Context, this quickjs.Value, args []quickjs.Value) quickjs.Value {
		fmt.Println("A got called!")
		return ctx.Null()
	}

	B := func(ctx *quickjs.Context, this quickjs.Value, args []quickjs.Value) quickjs.Value {
		fmt.Println("B got called!")
		return ctx.Null()
	}

	globals.Set("A", context.Function(A))
	globals.Set("B", context.Function(B))

	_, err = context.Eval(`for (let i = 0; i < 10; i++) { if (i % 2 === 0) A(); else B(); }`)
	check(err)

	fmt.Println()

	// Test setting global variables.

	_, err = context.Eval(`HELLO = "world"; TEST = false;`)
	check(err)

	names, err := globals.PropertyNames()
	check(err)

	fmt.Println("Globals:")
	for _, name := range names {
		val := globals.GetByAtom(name.Atom)
		defer val.Free()

		fmt.Printf("'%s': %s\n", name, val)
	}
	fmt.Println()

	// Test evaluating arbitrary expressions from flag arguments.

	flag.Parse()
	if flag.NArg() == 0 {
		return
	}

	result, err = context.Eval(strings.Join(flag.Args(), " "))
	check(err)
	defer result.Free()

	if result.IsObject() {
		names, err := result.PropertyNames()
		check(err)

		fmt.Println("Object:")
		for _, name := range names {
			val := result.GetByAtom(name.Atom)
			defer val.Free()

			fmt.Printf("'%s': %s\n", name, val)
		}
	} else {
		fmt.Println(result.String())
	}
}

License

QuickJS is released under the MIT license.

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var (
	EVAL_GLOBAL int = int(C.JS_EVAL_TYPE_GLOBAL)
	EVAL_MODULE int = int(C.JS_EVAL_TYPE_MODULE)
	EVAL_STRICT int = int(C.JS_EVAL_FLAG_STRICT)
	EVAL_STRIP  int = int(C.JS_EVAL_FLAG_STRIP)
)

Functions

This section is empty.

Types

type Atom 

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

func (Atom) Free 

func (a Atom) Free()

func (Atom) String 

func (a Atom) String() string

func (Atom) Value 

func (a Atom) Value() Value

type Context 

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

func (*Context) Eval 

func (ctx *Context) Eval(code string, evaltype int) (Value, error)

func (*Context) EvalFile 

func (ctx *Context) EvalFile(code string, evaltype int, filename string) (Value, error)

func (*Context) Exception 

func (ctx *Context) Exception() error

func (*Context) Free 

func (ctx *Context) Free()

func (*Context) Function 

func (ctx *Context) Function(fn Function) Value

func (*Context) Globals 

func (ctx *Context) Globals() *Value

func (*Context) Int64 

func (ctx *Context) Int64(v int64) Value

func (*Context) Null 

func (ctx *Context) Null() Value

type Error 

type Error struct {
	Cause      string
	Message    string
	FileName   string
	LineNumber string
	Stack      string
}

func (Error) Error 

func (err Error) Error() string

func (Error) String 

func (err Error) String() string

type Function 

type Function func(ctx *Context, this Value, args []Value) Value

type JsInterface 

type JsInterface interface {
	Register(runtime Runtime, context *Context, thread *JsThread) bool
	Unregister(runtime Runtime, context *Context, thread *JsThread)
}

type JsThread 

type JsThread struct {
	*Runtime
	*Context
	// contains filtered or unexported fields
}

func NewJsThread 

func NewJsThread(Interface JsInterface) *JsThread

func (*JsThread) Call 

func (j *JsThread) Call(obj, fn Value, args []Value) (result Value, err error)

func (*JsThread) Close 

func (j *JsThread) Close()

func (*JsThread) Eval 

func (j *JsThread) Eval(code string, evaltype int) (result Value, err error)

type ObjectId 

type ObjectId int64

func NewObjectId 

func NewObjectId(obj interface{}) ObjectId

func (*ObjectId) Free 

func (id *ObjectId) Free()

func (ObjectId) Get 

func (id ObjectId) Get() (interface{}, bool)

func (ObjectId) IsNil 

func (id ObjectId) IsNil() bool

type Runtime 

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

func NewRuntime 

func NewRuntime() *Runtime

func (*Runtime) Free 

func (r *Runtime) Free()

func (*Runtime) NewContext 

func (r *Runtime) NewContext() *Context

type Value 

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

func (Value) BigFloat 

func (v Value) BigFloat() *big.Float

func (Value) BigInt 

func (v Value) BigInt() *big.Int

func (Value) Bool 

func (v Value) Bool() bool

func (Value) Context 

func (v Value) Context() *Context

func (Value) Error 

func (v Value) Error() error

func (Value) Float64 

func (v Value) Float64() float64

func (Value) Free 

func (v Value) Free()

func (Value) Get 

func (v Value) Get(name string) Value

func (Value) GetByAtom 

func (v Value) GetByAtom(atom Atom) Value

func (Value) GetByUint32 

func (v Value) GetByUint32(idx uint32) Value

func (Value) Int32 

func (v Value) Int32() int32

func (Value) Int64 

func (v Value) Int64() int64

func (Value) IsArray 

func (v Value) IsArray() bool

func (Value) IsBigDecimal 

func (v Value) IsBigDecimal() bool

func (Value) IsBigFloat 

func (v Value) IsBigFloat() bool

func (Value) IsBigInt 

func (v Value) IsBigInt() bool

func (Value) IsBool 

func (v Value) IsBool() bool

func (Value) IsConstructor 

func (v Value) IsConstructor() bool

func (Value) IsError 

func (v Value) IsError() bool

func (Value) IsException 

func (v Value) IsException() bool

func (Value) IsFunction 

func (v Value) IsFunction() bool

func (Value) IsNull 

func (v Value) IsNull() bool

func (Value) IsNumber 

func (v Value) IsNumber() bool

func (Value) IsObject 

func (v Value) IsObject() bool

func (Value) IsString 

func (v Value) IsString() bool

func (Value) IsSymbol 

func (v Value) IsSymbol() bool

func (Value) IsUndefined 

func (v Value) IsUndefined() bool

func (Value) IsUninitialized 

func (v Value) IsUninitialized() bool

func (Value) Len 

func (v Value) Len() int64

func (Value) Set 

func (v Value) Set(name string, val Value)

func (Value) SetByAtom 

func (v Value) SetByAtom(atom Atom, val Value)

func (Value) SetByInt64 

func (v Value) SetByInt64(idx int64, val Value)

func (Value) SetByUint32 

func (v Value) SetByUint32(idx uint32, val Value)

func (Value) SetFunction 

func (v Value) SetFunction(name string, fn Function)

func (Value) String 

func (v Value) String() string

func (Value) Uint32 

func (v Value) Uint32() uint32

Source Files

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Directories

Path Synopsis
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normal command

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