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package main
import (
"bufio"
"flag"
"fmt"
"github.com/yuin/gopher-lua"
"github.com/yuin/gopher-lua/parse"
"os"
"runtime/pprof"
)
func main() {
os.Exit(mainAux())
}
func mainAux() int {
var opt_e, opt_l, opt_p string
var opt_i, opt_v, opt_dt, opt_dc bool
var opt_m int
flag.StringVar(&opt_e, "e", "", "")
flag.StringVar(&opt_l, "l", "", "")
flag.StringVar(&opt_p, "p", "", "")
flag.IntVar(&opt_m, "mx", 0, "")
flag.BoolVar(&opt_i, "i", false, "")
flag.BoolVar(&opt_v, "v", false, "")
flag.BoolVar(&opt_dt, "dt", false, "")
flag.BoolVar(&opt_dc, "dc", false, "")
flag.Usage = func() {
fmt.Println(`Usage: glua [options] [script [args]].
Available options are:
-e stat execute string 'stat'
-l name require library 'name'
-mx MB memory limit(default: unlimited)
-dt dump AST trees
-dc dump VM codes
-i enter interactive mode after executing 'script'
-p file write cpu profiles to the file
-v show version information
`)
}
flag.Parse()
if len(opt_p) != 0 {
f, err := os.Create(opt_p)
if err != nil {
fmt.Println(err.Error())
os.Exit(1)
}
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
if len(opt_e) == 0 && !opt_i && !opt_v && flag.NArg() == 0 {
opt_i = true
}
status := 0
L := lua.NewState()
defer L.Close()
if opt_m > 0 {
L.SetMx(opt_m)
}
if opt_v || opt_i {
fmt.Println(lua.PackageCopyRight)
}
if len(opt_l) > 0 {
if err := L.DoFile(opt_l); err != nil {
fmt.Println(err.Error())
}
}
if nargs := flag.NArg(); nargs > 0 {
script := flag.Arg(0)
argtb := L.NewTable()
for i := 1; i < nargs; i++ {
L.RawSet(argtb, lua.LNumber(i), lua.LString(flag.Arg(i)))
}
L.SetGlobal("arg", argtb)
if opt_dt || opt_dc {
file, err := os.Open(script)
if err != nil {
fmt.Println(err.Error())
return 1
}
chunk, err2 := parse.Parse(file, script)
if err2 != nil {
fmt.Println(err2.Error())
return 1
}
if opt_dt {
fmt.Println(parse.Dump(chunk))
}
if opt_dc {
proto, err3 := lua.Compile(chunk, script)
if err3 != nil {
fmt.Println(err3.Error())
return 1
}
fmt.Println(proto.String())
}
}
if err := L.DoFile(script); err != nil {
fmt.Println(err.Error())
status = 1
}
}
if len(opt_e) > 0 {
if err := L.DoString(opt_e); err != nil {
fmt.Println(err.Error())
status = 1
}
}
if opt_i {
doREPL(L)
}
return status
}
// do read/eval/print/loop
func doREPL(L *lua.LState) {
reader := bufio.NewReader(os.Stdin)
for {
if str, err := loadline(reader, L); err == nil {
if err := L.DoString(str); err != nil {
fmt.Println(err)
}
} else { // error on loadline
fmt.Println(err)
return
}
}
}
func incomplete(err error) bool {
if lerr, ok := err.(*lua.ApiError); ok {
if perr, ok := lerr.Cause.(*parse.Error); ok {
return perr.Pos.Line == parse.EOF
}
}
return false
}
func loadline(reader *bufio.Reader, L *lua.LState) (string, error) {
fmt.Print("> ")
if line, err := reader.ReadString('\n'); err == nil {
if _, err := L.LoadString("return " + line); err == nil { // try add return <...> then compile
return line, nil
} else {
return multiline(line, reader, L)
}
} else {
return "", err
}
}
func multiline(ml string, reader *bufio.Reader, L *lua.LState) (string, error) {
for {
if _, err := L.LoadString(ml); err == nil { // try compile
return ml, nil
} else if !incomplete(err) { // syntax error , but not EOF
return ml, nil
} else {
fmt.Print(">> ")
if line, err := reader.ReadString('\n'); err == nil {
ml = ml + "\n" + line
} else {
return "", err
}
}
}
}
|
