package jsre

import "github.com/ethereum/go-ethereum/internal/jsre"

Package jsre provides execution environment for JavaScript.

Index ¶

• Variables
• func MakeCallback(vm *goja.Runtime, fn func(Call) (goja.Value, error)) goja.Value
• func SafeGet(obj *goja.Object, key string) (ret goja.Value)
• type Call
• type JSRE
• func New(assetPath string, output io.Writer) *JSRE
• func (re *JSRE) Compile(filename string, src string) (err error)
• func (jsre *JSRE) CompleteKeywords(line string) []string
• func (re *JSRE) Do(fn func(*goja.Runtime))
• func (re *JSRE) Evaluate(code string, w io.Writer)
• func (re *JSRE) Exec(file string) error
• func (re *JSRE) Run(code string) (v goja.Value, err error)
• func (re *JSRE) Set(ns string, v interface{}) (err error)
• func (re *JSRE) Stop(waitForCallbacks bool)

Package Files ¶

completion.go jsre.go pretty.go

Variables ¶

var (
    FunctionColor = color.New(color.FgMagenta).SprintfFunc()
    SpecialColor  = color.New(color.Bold).SprintfFunc()
    NumberColor   = color.New(color.FgRed).SprintfFunc()
    StringColor   = color.New(color.FgGreen).SprintfFunc()
    ErrorColor    = color.New(color.FgHiRed).SprintfFunc()
)

func MakeCallback ¶ Uses

func MakeCallback(vm *goja.Runtime, fn func(Call) (goja.Value, error)) goja.Value

MakeCallback turns the given function into a function that's callable by JS.

func SafeGet ¶ Uses

func SafeGet(obj *goja.Object, key string) (ret goja.Value)

SafeGet attempt to get the value associated to `key`, and catches the panic that goja creates if an error occurs in key.

type Call ¶ Uses

type Call struct {
    goja.FunctionCall
    VM  *goja.Runtime
}

Call is the argument type of Go functions which are callable from JS.

type JSRE ¶ Uses

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

JSRE is a JS runtime environment embedding the goja interpreter. It provides helper functions to load code from files, run code snippets and bind native go objects to JS.

The runtime runs all code on a dedicated event loop and does not expose the underlying goja runtime directly. To use the runtime, call JSRE.Do. When binding a Go function, use the Call type to gain access to the runtime.

func New ¶ Uses

func New(assetPath string, output io.Writer) *JSRE

runtime must be stopped with Stop() after use and cannot be used after stopping

func (*JSRE) Compile ¶ Uses

func (re *JSRE) Compile(filename string, src string) (err error)

Compile compiles and then runs a piece of JS code.

func (*JSRE) CompleteKeywords ¶ Uses

func (jsre *JSRE) CompleteKeywords(line string) []string

CompleteKeywords returns potential continuations for the given line. Since line is evaluated, callers need to make sure that evaluating line does not have side effects.

func (*JSRE) Do ¶ Uses

func (re *JSRE) Do(fn func(*goja.Runtime))

Do executes the given function on the JS event loop.

func (*JSRE) Evaluate ¶ Uses

func (re *JSRE) Evaluate(code string, w io.Writer)

Evaluate executes code and pretty prints the result to the specified output stream.

func (*JSRE) Exec ¶ Uses

func (re *JSRE) Exec(file string) error

Exec(file) loads and runs the contents of a file if a relative path is given, the jsre's assetPath is used

func (*JSRE) Run ¶ Uses

func (re *JSRE) Run(code string) (v goja.Value, err error)

Run runs a piece of JS code.

func (*JSRE) Set ¶ Uses

func (re *JSRE) Set(ns string, v interface{}) (err error)

Set assigns value v to a variable in the JS environment.

func (*JSRE) Stop ¶ Uses

func (re *JSRE) Stop(waitForCallbacks bool)

stops the event loop before exit, optionally waits for all timers to expire

Directories ¶