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template.go
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template.go
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// Copyright 2021 Roger Chapman and the v8go contributors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package v8go
// #include <stdlib.h>
// #include "v8go.h"
import "C"
import (
"errors"
"fmt"
"math/big"
"runtime"
"unsafe"
)
type template struct {
ptr C.TemplatePtr
iso *Isolate
}
// Set adds a property to each instance created by this template.
// The property must be defined either as a primitive value, or a template.
// If the value passed is a Go supported primitive (string, int32, uint32, int64, uint64, float64, big.Int)
// then a value will be created and set as the value property.
func (t *template) Set(name string, val interface{}, attributes ...PropertyAttribute) error {
cname := C.CString(name)
defer C.free(unsafe.Pointer(cname))
var attrs PropertyAttribute
for _, a := range attributes {
attrs |= a
}
switch v := val.(type) {
case string, int32, uint32, int64, uint64, float64, bool, *big.Int:
newVal, err := NewValue(t.iso, v)
if err != nil {
return fmt.Errorf("v8go: unable to create new value: %v", err)
}
C.TemplateSetValue(t.ptr, cname, newVal.ptr, C.int(attrs))
case *ObjectTemplate:
C.TemplateSetTemplate(t.ptr, cname, v.ptr, C.int(attrs))
runtime.KeepAlive(v)
case *FunctionTemplate:
C.TemplateSetTemplate(t.ptr, cname, v.ptr, C.int(attrs))
runtime.KeepAlive(v)
case *Value:
if v.IsObject() || v.IsExternal() {
return errors.New("v8go: unsupported property: value type must be a primitive or use a template")
}
C.TemplateSetValue(t.ptr, cname, v.ptr, C.int(attrs))
default:
return fmt.Errorf("v8go: unsupported property type `%T`, must be one of string, int32, uint32, int64, uint64, float64, *big.Int, *v8go.Value, *v8go.ObjectTemplate or *v8go.FunctionTemplate", v)
}
runtime.KeepAlive(t)
return nil
}
func (t *template) finalizer() {
// Using v8::PersistentBase::Reset() wouldn't be thread-safe to do from
// this finalizer goroutine so just free the wrapper and let the template
// itself get cleaned up when the isolate is disposed.
C.TemplateFreeWrapper(t.ptr)
t.ptr = nil
}