Esempio n. 1
0
File: mobile.go Progetto: zzn01/ivy
// Eval evaluates the input string and returns its output.
// If execution caused errors, they will be returned concatenated
// together in the error value returned.
// TODO: Should it stop at first error?
func Eval(expr string) (result string, errors error) {
	if !strings.HasSuffix(expr, "\n") {
		expr += "\n"
	}
	reader := strings.NewReader(expr)
	stdout := new(bytes.Buffer)
	stderr := new(bytes.Buffer)

	conf.SetOutput(stdout)
	conf.SetErrOutput(stderr)

	scanner := scan.New(&conf, context, " ", reader)
	parser := parse.NewParser(&conf, " ", scanner, context)

	for !run.Run(parser, context, false) {
	}
	var err error
	if stderr.Len() > 0 {
		err = fmt.Errorf("%s", stderr)
	}
	return stdout.String(), err
}
Esempio n. 2
0
File: ivy.go Progetto: zzn01/ivy
func main() {
	flag.Usage = usage
	flag.Parse()

	if *origin != 0 && *origin != 1 {
		fmt.Fprintf(os.Stderr, "ivy: illegal origin value %d\n", *origin)
		os.Exit(2)
	}

	if *gformat {
		*format = "%.12g"
	}

	conf.SetFormat(*format)
	conf.SetMaxBits(*maxbits)
	conf.SetMaxDigits(*maxdigits)
	conf.SetOrigin(*origin)
	conf.SetPrompt(*prompt)
	if len(*debugFlag) > 0 {
		for _, debug := range strings.Split(*debugFlag, ",") {
			if !conf.SetDebug(debug, true) {
				fmt.Fprintf(os.Stderr, "ivy: unknown debug flag %q", debug)
				os.Exit(2)
			}
		}
	}

	value.SetConfig(&conf)
	context = exec.NewContext()
	value.SetContext(context)

	run.SetConfig(&conf)

	if *execute {
		runArgs(context)
		return
	}

	if flag.NArg() > 0 {
		for i := 0; i < flag.NArg(); i++ {
			name := flag.Arg(i)
			var fd io.Reader
			var err error
			interactive := false
			if name == "-" {
				interactive = true
				fd = os.Stdin
			} else {
				interactive = false
				fd, err = os.Open(name)
			}
			if err != nil {
				fmt.Fprintf(os.Stderr, "ivy: %s\n", err)
				os.Exit(1)
			}
			scanner := scan.New(&conf, context, name, bufio.NewReader(fd))
			parser := parse.NewParser(&conf, name, scanner, context)
			if !run.Run(parser, context, interactive) {
				break
			}
		}
		return
	}

	scanner := scan.New(&conf, context, "<stdin>", bufio.NewReader(os.Stdin))
	parser := parse.NewParser(&conf, "<stdin>", scanner, context)
	for !run.Run(parser, context, true) {
	}
}
Esempio n. 3
0
File: ivy.go Progetto: zzn01/ivy
// runArgs executes the text of the command-line arguments as an ivy program.
func runArgs(context value.Context) {
	scanner := scan.New(&conf, context, "<args>", strings.NewReader(strings.Join(flag.Args(), " ")))
	parser := parse.NewParser(&conf, "<args>", scanner, context)
	run.Run(parser, context, false)
}