func main() {
fs := flag.NewFlagSet(os.Args[0], flag.ExitOnError)
// define command-line flags
var (
cacheFlag = fs.Bool("cache", false, "cache parsing results")
dbgFlag = fs.Bool("debug", false, "set debug mode")
shortHelpFlag = fs.Bool("h", false, "show help page")
longHelpFlag = fs.Bool("help", false, "show help page")
noRecoverFlag = fs.Bool("no-recover", false, "do not recover from panic")
outputFlag = fs.String("o", "", "output file, defaults to stdout")
recvrNmFlag = fs.String("receiver-name", "c", "receiver name for the generated methods")
noBuildFlag = fs.Bool("x", false, "do not build, only parse")
)
fs.Usage = usage
fs.Parse(os.Args[1:])
if *shortHelpFlag || *longHelpFlag {
fs.Usage()
exit(0)
}
if fs.NArg() > 1 {
argError(1, "expected one argument, got %q", strings.Join(fs.Args(), " "))
}
// get input source
infile := ""
if fs.NArg() == 1 {
infile = fs.Arg(0)
}
nm, rc := input(infile)
defer rc.Close()
// parse input
g, err := ParseReader(nm, rc, Debug(*dbgFlag), Memoize(*cacheFlag), Recover(!*noRecoverFlag))
if err != nil {
fmt.Fprintln(os.Stderr, "parse error(s):\n", err)
exit(3)
}
if !*noBuildFlag {
// generate parser
out := output(*outputFlag)
defer out.Close()
curNmOpt := builder.ReceiverName(*recvrNmFlag)
if err := builder.BuildParser(out, g.(*ast.Grammar), curNmOpt); err != nil {
fmt.Fprintln(os.Stderr, "build error: ", err)
exit(5)
}
}
}
func main() {
dbgFlag := flag.Bool("debug", false, "set debug mode")
noBuildFlag := flag.Bool("x", false, "do not build, only parse")
outputFlag := flag.String("o", "", "output file, defaults to stdout")
flag.Parse()
if flag.NArg() > 1 {
fmt.Fprintf(os.Stderr, "USAGE: %s [options] [FILE]\n", os.Args[0])
os.Exit(1)
}
nm := "stdin"
inf := os.Stdin
if flag.NArg() == 1 {
f, err := os.Open(flag.Arg(0))
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(2)
}
defer f.Close()
inf = f
nm = flag.Arg(0)
}
in := bufio.NewReader(inf)
g, err := ParseReader(nm, in, Debug(*dbgFlag))
if err != nil {
fmt.Fprintln(os.Stderr, "parse error: ", err)
os.Exit(3)
}
if !*noBuildFlag {
outw := os.Stdout
if *outputFlag != "" {
f, err := os.Create(*outputFlag)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(4)
}
defer f.Close()
outw = f
}
if err := builder.BuildParser(outw, g.(*ast.Grammar)); err != nil {
fmt.Fprintln(os.Stderr, "build error: ", err)
os.Exit(5)
}
}
}