Implementation of OL/UL testing

[ankita240796]

In reference to #94, #427. What approaches can we take to implement testing for ordered list and unordered list in style-guide testing?

[adammichaelwood]

One possible approach would be to use NLTK to look for verbs.

It is probably the case that a list is a procedure if every (or most) bullet points begin with a verb in the base or singular non-3rd present (VB or VBP in NLTK terms).

[ankita240796]

@adammichaelwood I tested NLTK with the following code to check for ordered list.

def check_list(text):
    """Find and check ordered lists."""
    regex = r'(\d+\.\s.*\n?)+'
    ordlist = []
    for m in re.finditer(regex, text):
        ordlist += [(m.group(0),m.start()+1)]
    length = len(ordlist)
    index = 0
    while index < length:
        ol = []
        ele = ordlist[index]
        item = ele[0]
        start = ele[1]
        (row, col) = line_and_column(text, start)
        ol.append(item)
        index += 1
        while index < length:
            ele = ordlist[index]
            item = ele[0]
            if item.startswith("1. "):
                break
            ol.append(item)
            index += 1
        for point in ol:
            tokens = nltk.word_tokenize(point)
            tagged = nltk.pos_tag(tokens)
            print(tagged)

The problem is that with a list like this one, the tags returned for first words are: NNP or NN instead of VB or VBP.

1. Click on :guilabel:`Apps` button at the bottom of the screen.

   .. image:: /img/collect-best-practices/apps.png
      :alt: Image showing Apps button.
      :class: device-screen-vertical

2. :gesture:`Touch and hold` on an empty space on the Home screen and then click on :guilabel:`Widgets` button at the bottom of the screen.

   .. image:: /img/collect-best-practices/widgets.png
      :alt: Image showing Widgets button.
      :class: device-screen-vertical

3. Find the :guilabel:`ODK Form` widget and then :gesture:`touch and hold` it.

   .. image:: /img/collect-best-practices/odk-form.png
      :alt: Image showing ODK Form widget.
      :class: device-screen-vertical

4. A menu pops up listing all the available forms. Select the form you wish to create a shortcut for.

   .. image:: /img/collect-best-practices/form-list.png
      :alt: Image showing form list.
      :class: device-screen-vertical

5. Shortcut for the selected form will appear on your home screen. You can move the shortcut to the desired position by :gesture:`drag and drop`.

   .. image:: /img/collect-best-practices/form-shortcut.png
      :alt: Image showing form shortcut.
      :class: device-screen-vertical

Result is quite diverese for various lists. So, in many cases false warnings will be shown. I am not sure about how to proceed. Any suggestions on this?