ExerciseLib::check_fill_in_blanks()

Complexity

Conditions	19
Paths	156

Size

Total Lines	126
Code Lines	74

Duplication

Lines	0
Ratio	0 %

Importance

Changes

0

<?php
     * @param array  $answer
     * @param string $user_answer
     *
     * @return array
     */
    public static function check_fill_in_blanks($answer, $user_answer, $current_answer)
    {
        // the question is encoded like this
        // [A] B [C] D [E] F::10,10,10@1
        // number 1 before the "@" means that is a switchable fill in blank question
        // [A] B [C] D [E] F::10,10,10@ or  [A] B [C] D [E] F::10,10,10
        // means that is a normal fill blank question
        // first we explode the "::"
        $pre_array = explode('::', $answer);
        // is switchable fill blank or not
        $last = count($pre_array) - 1;
        $is_set_switchable = explode('@', $pre_array[$last]);
        $switchable_answer_set = false;
        if (isset($is_set_switchable[1]) && $is_set_switchable[1] == 1) {
            $switchable_answer_set = true;
        }
        $answer = '';
        for ($k = 0; $k < $last; $k++) {
            $answer .= $pre_array[$k];
        }
        // splits weightings that are joined with a comma
        $answerWeighting = explode(',', $is_set_switchable[0]);

        // we save the answer because it will be modified
        //$temp = $answer;
        $temp = $answer;

        $answer = '';
        $j = 0;
        //initialise answer tags
        $user_tags = $correct_tags = $real_text = [];
        // the loop will stop at the end of the text
        while (1) {
            // quits the loop if there are no more blanks (detect '[')
            if (($pos = api_strpos($temp, '[')) === false) {
                // adds the end of the text
                $answer = $temp;
                $real_text[] = $answer;
                break; //no more "blanks", quit the loop
            }
            // adds the piece of text that is before the blank
            //and ends with '[' into a general storage array
            $real_text[] = api_substr($temp, 0, $pos + 1);
            $answer .= api_substr($temp, 0, $pos + 1);
            //take the string remaining (after the last "[" we found)
            $temp = api_substr($temp, $pos + 1);
            // quit the loop if there are no more blanks, and update $pos to the position of next ']'
            if (($pos = api_strpos($temp, ']')) === false) {
                // adds the end of the text
                $answer .= $temp;
                break;
            }

            $str = $user_answer;

            preg_match_all('#\[([^[]*)\]#', $str, $arr);
            $str = str_replace('\r\n', '', $str);
            $choices = $arr[1];
            $choice = [];
            $check = false;
            $i = 0;
            foreach ($choices as $item) {
                if ($current_answer === $item) {
                    $check = true;
                }
                if ($check) {
                    $choice[] = $item;
                    $i++;
                }
                if ($i == 3) {
                    break;
                }
            }
            $tmp = api_strrpos($choice[$j], ' / ');

            if ($tmp !== false) {
                $choice[$j] = api_substr($choice[$j], 0, $tmp);
            }

            $choice[$j] = trim($choice[$j]);

            //Needed to let characters ' and " to work as part of an answer
            $choice[$j] = stripslashes($choice[$j]);

            $user_tags[] = api_strtolower($choice[$j]);
            //put the contents of the [] answer tag into correct_tags[]
            $correct_tags[] = api_strtolower(api_substr($temp, 0, $pos));
            $j++;
            $temp = api_substr($temp, $pos + 1);
        }

        $answer = '';
        $real_correct_tags = $correct_tags;
        $chosen_list = [];
        $good_answer = [];

        for ($i = 0; $i < count($real_correct_tags); $i++) {
            if (!$switchable_answer_set) {
                //needed to parse ' and " characters
                $user_tags[$i] = stripslashes($user_tags[$i]);
                if ($correct_tags[$i] == $user_tags[$i]) {
                    $good_answer[$correct_tags[$i]] = 1;
                } elseif (!empty($user_tags[$i])) {
                    $good_answer[$correct_tags[$i]] = 0;
                } else {
                    $good_answer[$correct_tags[$i]] = 0;
                }
            } else {
                // switchable fill in the blanks
                if (in_array($user_tags[$i], $correct_tags)) {
                    $correct_tags = array_diff($correct_tags, $chosen_list);
                    $good_answer[$correct_tags[$i]] = 1;
                } elseif (!empty($user_tags[$i])) {
                    $good_answer[$correct_tags[$i]] = 0;
                } else {
                    $good_answer[$correct_tags[$i]] = 0;
                }
            }
            // adds the correct word, followed by ] to close the blank
            $answer .= ' / <font color="green"><b>'.$real_correct_tags[$i].'</b></font>]';
            if (isset($real_text[$i + 1])) {
                $answer .= $real_text[$i + 1];