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prettier.go
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prettier.go
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package prettier_go
import (
"dario.cat/mergo"
_ "embed"
"encoding/json"
"errors"
"github.com/dop251/goja"
"log"
"time"
)
//go:embed js/standalone.js
var standalone string
//go:embed js/babel.js
var babelPlugin string
//go:embed js/typescript.js
var typescriptPlugin string
//go:embed js/estree.js
var estreePlugin string
//go:embed js/markdown.js
var markdownPlugin string
//go:embed js/html.js
var htmlPlugin string
type FormatType string
type PrettierOption struct {
UseTabs bool `json:"useTabs"`
TabWidth int `json:"tabWidth"`
PrintWidth int `json:"printWidth"`
SingleQuote bool `json:"singleQuote"`
TrailingComma string `json:"trailingComma"`
Semi bool `json:"semi"`
}
var vm *goja.Runtime
var format goja.Callable
var defaults = PrettierOption{
UseTabs: false,
TabWidth: 4,
PrintWidth: 80,
SingleQuote: false,
TrailingComma: "none",
Semi: false,
}
func toJsonString[T any](value T) string {
data, err := json.Marshal(value)
if err != nil {
log.Println("toJsonString error:", err)
return ""
}
return string(data)
}
func handlePromise(value goja.Value, code string) (string, error) {
if p, ok := value.Export().(*goja.Promise); ok {
switch p.State() {
case goja.PromiseStateRejected:
return code, errors.New(p.Result().String())
case goja.PromiseStateFulfilled:
return p.Result().Export().(string), nil
default:
return code, errors.New("unexpected promise state pending")
}
}
return "", nil
}
func FormatText(ext goja.Value, code goja.Value, opts goja.Value) (goja.Value, error) {
time.AfterFunc(2*time.Second, func() {
vm.Interrupt("timeout > 2s")
})
value, err := format(goja.Undefined(), ext, code, opts)
if err != nil {
return code, err
}
return value, nil
}
func FormatTypeScript(code string, opts PrettierOption) (string, error) {
if err := mergo.Map(&opts, defaults); err != nil {
log.Println("mergo defaults error:", err)
return code, err
}
value, err := FormatText(vm.ToValue("typescript"), vm.ToValue(code), vm.ToValue(toJsonString(opts)))
if err != nil {
return code, err
}
return handlePromise(value, code)
}
func FormatJSON(code string, opts PrettierOption) (string, error) {
if err := mergo.Map(&opts, defaults); err != nil {
log.Println("mergo defaults error:", err)
return code, err
}
value, err := FormatText(vm.ToValue("json"), vm.ToValue(code), vm.ToValue(toJsonString(opts)))
if err != nil {
return code, err
}
return handlePromise(value, code)
}
func FormatMarkdown(code string, opts PrettierOption) (string, error) {
if err := mergo.Map(&opts, defaults); err != nil {
log.Println("mergo defaults error:", err)
return code, err
}
value, err := FormatText(vm.ToValue("markdown"), vm.ToValue(code), vm.ToValue(toJsonString(opts)))
if err != nil {
return code, err
}
return handlePromise(value, code)
}
func FormatHTML(code string, opts PrettierOption) (string, error) {
if err := mergo.Map(&opts, defaults); err != nil {
log.Println("mergo defaults error:", err)
return code, err
}
value, err := FormatText(vm.ToValue("html"), vm.ToValue(code), vm.ToValue(toJsonString(opts)))
if err != nil {
return code, err
}
return handlePromise(value, code)
}
var exported = `
async function format(parser, code, optsJsonString) {
return prettier.format(code, Object.assign(JSON.parse(optsJsonString), {
parser: parser,
plugins: prettierPlugins
}));
}
`
func init() {
vm = goja.New()
_, err := vm.RunString(standalone + babelPlugin + typescriptPlugin + estreePlugin + htmlPlugin + markdownPlugin + exported)
if err != nil {
log.Fatalln("prettier error:", err)
}
ret, ok := goja.AssertFunction(vm.Get("format"))
if !ok {
panic("not a function")
} else {
format = ret
}
}