func mainBuild(args []string) {
fset := flag.NewFlagSet("asm8-build", flag.ExitOnError)
outFlag := fset.String("o", "out.e8", "output e8 image")
fset.Parse(args)
files := fset.Args()
if len(files) != 1 {
fmt.Fprintln(os.Stderr, "expect one single input file.")
os.Exit(1)
}
onError := func(e error) {
if e == nil {
return
}
if e != nil {
fmt.Fprintln(os.Stderr, e)
os.Exit(1)
panic("not reachable")
}
}
onErrors := func(es []error) {
if len(es) == 0 {
return
}
for _, e := range es {
fmt.Fprintln(os.Stderr, e)
}
os.Exit(1)
panic("not reachable")
}
f := files[0]
fin, e := os.Open(f)
onError(e)
parser := parser.New(fin, f)
astree, errs := parser.Parse()
onErrors(errs)
onError(fin.Close())
b := build.NewBuild()
gen := codegen.NewGen(b, astree)
errs = gen.Gen()
onErrors(errs)
fout, e := os.Create(*outFlag)
onError(e)
e = b.WriteImage(fout)
onError(e)
onError(fout.Close())
}
func mainParse(args []string) {
fset := flag.NewFlagSet("asm8-parse", flag.ExitOnError)
astFlag := fset.Bool("ast", false, "print AST instead of token tree")
fset.Parse(args)
files := fset.Args()
if len(files) != 1 {
fmt.Fprintln(os.Stderr, "expects one single input file.")
os.Exit(1)
}
onError := func(e error) { fmt.Fprintln(os.Stderr, e) }
f := files[0]
fin, e := os.Open(f)
if e != nil {
onError(e)
os.Exit(1)
return
}
parser := parser.New(fin, f)
res, errs := parser.Parse()
if *astFlag {
if res != nil {
p := prt.Stdout()
p.Indent = " "
ast.Print(p, res)
}
} else {
parser.PrintTree(os.Stdout)
}
for _, e := range errs {
onError(e)
}
if len(errs) > 0 {
os.Exit(1)
return
}
}