func mainParse(args []string) {
fset := flag.NewFlagSet("leaf-parse", flag.ExitOnError)
astFlag := fset.Bool("ast", false, "print AST instead of token tree")
fset.Parse(args)
files := fset.Args()
if len(files) == 0 {
fmt.Fprintln(os.Stderr, "no input file.")
return
}
for _, f := range files {
fmt.Printf("[%s]\n", f)
if *astFlag {
res, errs := parser.Parse(f)
printErrors(errs)
if res != nil {
p := prt.New(os.Stdout)
p.Indent = " "
ast.Print(p, res)
}
} else {
tree, errs := parser.ParseTree(f)
printErrors(errs)
if tree != nil { // might be nil when the file does not exist
tree.PrintTree(os.Stdout)
}
}
}
}
// Print prints the tree out in an indented format using
// the output stream.
func (t *Tracker) Print(out io.Writer) {
if t.root == nil {
return
}
p := prt.New(out)
p.Indent = " "
t.root.PrintTo(p)
}