Binder
High level go to Lua binder. Write less, do more.
Package binder allows to easily bind to Lua. Based on gopher-lua.
Write less, do more!
Killer-feature
You can display detailed information about the error and get something like this:
See _example/04-highlight-errors. And read more about it.
Installation
$ go get -u github.com/alexeyco/binder
To run unit tests:
$ cd $GOPATH/src/github.com/alexeyco/binder
$ go test -cover
To see why you need to bind go to lua (need few minutes):
$ cd $GOPATH/src/github.com/alexeyco/binder
$ go test -bench=.
Examples
Functions
package main
import (
"errors"
"log"
"github.com/alexeyco/binder"
)
func main() {
b := binder.New(binder.Options{
SkipOpenLibs: true,
})
b.Func("log", func(c *binder.Context) error {
t := c.Top()
if t == 0 {
return errors.New("need arguments")
}
l := []interface{}{}
for i := 1; i <= t; i++ {
l = append(l, c.Arg(i).Any())
}
log.Println(l...)
return nil
})
if err := b.DoString(`
log('This', 'is', 'Lua')
`); err != nil {
log.Fatalln(err)
}
}
Modules
package main
import (
"errors"
"log"
"github.com/alexeyco/binder"
)
func main() {
b := binder.New()
m := b.Module("reverse")
m.Func("string", func(c *binder.Context) error {
if c.Top() == 0 {
return errors.New("need arguments")
}
s := c.Arg(1).String()
runes := []rune(s)
for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
runes[i], runes[j] = runes[j], runes[i]
}
c.Push().String(string(runes))
return nil
})
if err := b.DoString(`
local r = require('reverse')
print(r.string('ABCDEFGHIJKLMNOPQRSTUFVWXYZ'))
`); err != nil {
log.Fatalln(err)
}
}
Tables
package main
import (
"errors"
"log"
"github.com/alexeyco/binder"
)
type Person struct {
Name string
}
func main() {
b := binder.New()
t := b.Table("person")
t.Static("new", func(c *binder.Context) error {
if c.Top() == 0 {
return errors.New("need arguments")
}
n := c.Arg(1).String()
c.Push().Data(&Person{n}, "person")
return nil
})
t.Dynamic("name", func(c *binder.Context) error {
p, ok := c.Arg(1).Data().(*Person)
if !ok {
return errors.New("person expected")
}
if c.Top() == 1 {
c.Push().String(p.Name)
} else {
p.Name = c.Arg(2).String()
}
return nil
})
if err := b.DoString(`
local p = person.new('Steeve')
print(p:name())
p:name('Alice')
print(p:name())
`); err != nil {
log.Fatalln(err)
}
}
Options
// Options binder options object
type Options struct {
// CallStackSize is call stack size
CallStackSize int
// RegistrySize is data stack size
RegistrySize int
// SkipOpenLibs controls whether or not libraries are opened by default
SkipOpenLibs bool
// IncludeGoStackTrace tells whether a Go stacktrace should be included in a Lua stacktrace when panics occur.
IncludeGoStackTrace bool
}
Read more.
For example:
b := binder.New(binder.Options{
SkipOpenLibs: true,
})
Killer-featured errors
package main
import (
"errors"
"log"
"os"
"github.com/alexeyco/binder"
)
type Person struct {
Name string
}
func main() {
b := binder.New()
// ...
if err := b.DoString(`-- some string`); err != nil {
switch err.(type) {
case *binder.Error:
e := err.(*binder.Error)
e.Print()
os.Exit(0)
break
default:
log.Fatalln(err)
}
}
}
Note: if SkipOpenLibs is true, not all open libs will be skipped in contrast to the basic logic of gopher-lua. If you set SkipOpenLibs to true, the following basic libraries will be loaded: all basic functions, table and package.
License
MIT License
Copyright (c) 2017 Alexey Popov
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
