primitives

package main

import (
	"encoding/json"
	"fmt"
	"log"

	"github.com/ChrisTrenkamp/gobindlua"
	lua "github.com/yuin/gopher-lua"
)

const script = `
local primitive_struct = require "primitive_struct"

--[[ You can call the constructor functions and methods and access the fields from Lua. ]]
data = primitive_struct.new()
data.my_bool = true
data.my_int = 42
data.my_int64 = 0xDEADBEEF
data.my_float = 3.14
data.my_string = "all your lua are belong to us"

print("MyBool: " .. tostring(data.my_bool))
print("MyInt: " .. tostring(data.my_int))
print("MyInt64: " .. tostring(data.my_int64))
print("MyFloat: " .. tostring(data.my_float))
print("MyString: " .. tostring(data.my_string))
print("WillBeExcluded has been excluded: " .. tostring(data.will_be_excluded == nil))

data:set_specialized_int(9001)
print("MySpecializedInt: " .. tostring(data.my_specialized_int))

print("DivideMyInt: " .. tostring(data:divide_my_int(2)))
local _, err = pcall(function () data:divide_my_int(0) end)
print("DivideMyInt error: " .. err)

print("ExcludedMethod has been excluded: " .. tostring(data.excluded_method == nil))
`

func main() {
	L := lua.NewState()
	defer L.Close()

	var registrarPointer *PrimitiveStruct
	gobindlua.Register(L, registrarPointer)
	// For ease of use, you can pass in &PrimitiveStruct{} to the Register function as well.
	// The Register function does not require the pointer to contain a value.  It's simply
	// for registering the metadata tables.

	if err := L.DoString(script); err != nil {
		log.Fatal(err)
	}

	data := L.GetGlobal("data").(*lua.LUserData).Value.(*PrimitiveStruct)
	jsonBytes, err := json.MarshalIndent(data, "", "\t")
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(string(jsonBytes))

}

Output:

MyBool: true
MyInt: 42
MyInt64: 3735928559
MyFloat: 3.14
MyString: all your lua are belong to us
WillBeExcluded has been excluded: true
MySpecializedInt: 9001
DivideMyInt: 21
DivideMyInt error: <string>:23: divide by zero error
ExcludedMethod has been excluded: true
{
	"MyBool": true,
	"MyInt": 42,
	"MyInt64": 3735928559,
	"MyFloat": 3.14,
	"SomeString": "all your lua are belong to us",
	"WillBeExcluded": "",
	"MySpecializedInt": 9001
}