Method structConstructor

compiler/decls.go:566–596

structConstructor returns JS constructor function for a struct type.

(t *types.Struct)

// structConstructor returns JS constructor function for a struct type.
func (fc *funcContext) structConstructor(t *types.Struct) string {
	if t.NumFields() == 0 {
		return `function() { this.$val = this; }`
	}

	constructor := &strings.Builder{}

	ctrArgs := make([]string, t.NumFields())
	for i := 0; i < t.NumFields(); i++ {
		ctrArgs[i] = fieldName(t, i) + "_"
	}

	fmt.Fprintf(constructor, "function(%s) {\n", strings.Join(ctrArgs, ", "))
	fmt.Fprintf(constructor, "\t\tthis.$val = this;\n")

	// If no arguments were passed, zero-initialize all fields.
	fmt.Fprintf(constructor, "\t\tif (arguments.length === 0) {\n")
	for i := 0; i < t.NumFields(); i++ {
		zeroValue := fc.zeroValue(fc.fieldType(t, i))
		fmt.Fprintf(constructor, "\t\t\tthis.%s = %s;\n", fieldName(t, i), fc.translateExpr(zeroValue).String())
	}
	fmt.Fprintf(constructor, "\t\t\treturn;\n")
	fmt.Fprintf(constructor, "\t\t}\n")

	// Otherwise initialize fields with the provided values.
	for i := 0; i < t.NumFields(); i++ {
		fmt.Fprintf(constructor, "\t\tthis.%[1]s = %[1]s_;\n", fieldName(t, i))
	}
	fmt.Fprintf(constructor, "\t}")
	return constructor.String()
}

// methodListEntry returns a JS code fragment that describes the given method
// function for runtime reflection. It returns isPtr=true if the method belongs