Some code to split a Unix-like command-line

splitParts.py

def splitParts(text, stack):
    # OOP, needed to protect raw-objects
    if debug: print("splitParts:", text, stack)
    try:
        length = len(text)
    except:
        return [text]
    retval = []
    i = 0
    current = makeAnnotatedString("")
    mode = "start"
    while i < length:
        if mode == "start":
            if text[i] == '\\': ## remove special chars
                i += 1
                current = addAnnotatedStrings(current, escaped(text[i], remove_special=True), i)
            #if text[i] == "\\":
            #    if text[i+1] == "n":
            #        current = addAnnotatedStrings(current, "\n", i)
            #    elif text[i+1] == "t":
            #        current = addAnnotatedStrings(current, "\t", i)
            #    else:
            #        current = addAnnotatedStrings(current, "\\" + text[i+1], i)
            #    i += 1
            elif text[i].startswith("#"):
                # ignore here to end of line
                break
            elif text[i] == " ":
                if current:
                    current.end = i
                    retval.extend(expand(current, stack))
                    current = makeAnnotatedString("")
                else:
                    pass ## skip
            elif text[i] == "=":
                if current:
                    current.end = i
                    retval.append(current)
                    current = makeAnnotatedString("")
                retval.append(makeAnnotatedString('=', i, i + 1))
            elif text[i] == "'":
                if current:
                    current.end = i
                    retval.append(current)
                    current = makeAnnotatedString("", i)
                mode = "quote"
            elif text[i] == '"':
                if current:
                    current.end = i
                    retval.append(current)
                    current = makeAnnotatedString("", i)
                mode = "double-quote"
            elif text[i] == '`':
                if current:
                    current.end = i
                    retval.append(current)
                    # signal expand that this is an expr:
                current = makeAnnotatedString("`", i)
                mode = "back-quote"
            else:
                current = addAnnotatedStrings(current, text[i], i)
        elif mode == "quote":
            if text[i] == "'":
                current.end = i
                retval.append(current)
                current = makeAnnotatedString("", -1)
                mode = "start"
            elif text[i] == '\\': ## replace with special char
                i += 1
                current = addAnnotatedStrings(current, escaped(text[i]), i)
            #elif text[i] == '\\':
            #    if text[i+1] == "n":
            #        current = addAnnotatedStrings(current, "\n", i)
            #        i += 1
            #    elif text[i+1] == "t":
            #        current = addAnnotatedStrings(current, "\t", i)
            #        i += 1
            #    else:
            #        current = addAnnotatedStrings(current, text[i], i)
            else:
                current = addAnnotatedStrings(current, text[i], i)
        elif mode == "double-quote":
            if text[i] == '"':
                current.end = i
                retval.append(current)
                current = makeAnnotatedString("", -1)
                mode = "start"
            elif text[i] == '\\': ## replace with special char
                i += 1
                current = addAnnotatedStrings(current, escaped(text[i]), i)
            #    if text[i+1] == "n":
            #        current = addAnnotatedStrings(current, "\n", i)
            #        i += 1
            #    elif text[i+1] == "t":
            #        current = addAnnotatedStrings(current, "\t", i)
            #        i += 1
            #    else:
            #        current = addAnnotatedStrings(current, text[i], i)
            else:
                current = addAnnotatedStrings(current, text[i], i)
        elif mode == "back-quote":
            if text[i] == '`':
                current.end = i
                retval.extend(expand(current, stack))
                current = makeAnnotatedString("", -1)
                mode = "start"
            elif text[i] == '\\': ## replace with special char
                i += 1
                current = addAnnotatedStrings(current, escaped(text[i]), i)
            #elif text[i] == '\\':
            #    if text[i+1] == "n":
            #        current = addAnnotatedStrings(current, "\n", i)
            #        i += 1
            #    elif text[i+1] == "t":
            #        current = addAnnotatedStrings(current, "\t", i)
            #        i += 1
            #    else:
            #        current = addAnnotatedStrings(current, text[i], i)
            else:
                current = addAnnotatedStrings(current, text[i], i)
        i += 1
    if current: # some still left:
        if mode == "start":
            current.end = i
            retval.extend(expand(current, stack))
        elif mode == "quote":
            raise ConsoleException("Console: unended quote", stack)
        elif mode == "double-quote":
            raise ConsoleException("Console: unended double-quote", stack)
        elif mode == "back-quote":
            raise ConsoleException("Console: unended back-quote: leftover: '%s'" % current, stack)
    return retval