<?php
date_default_timezone_set('Europe/London');
require_once '../-functions.php';
require_once '../toolkit/sc_survey_flow.php';
if (session_id() == '') {
session_start();
}
$surveyID = get_survey_id();
$deviceID = get_device_id();
$device_type = get_device_type($deviceID);
$langCode = isset($_SESSION['wrapper']['language']) ? $_SESSION['wrapper']['language'] : 'en';
$config = get_config($device_type, $surveyID, $langCode);
# Load rules
if ($survey = new SC_Survey_Flow($surveyID, FOLDER_SURVEYS, $langCode)) {
//Config
$survey->bool_store_bwd = TRUE;
//Process answers to questions
if (isset($_POST['sc_page_id'])) {
// Languages
if (isset($_POST['q_language'])) {
$langCode = $_POST['q_language'];
if (!is_null($langCode) && !empty($langCode)) {
$_SESSION['wrapper']['language'] = $langCode;
}
}
$next_id = $survey->go();
} else {
$first_id = $survey->obj_page_generator->get_first_page_id();
SC_Survey_Flow::reset_survey($first_id);
throw new Exception('no page id posted');
/**
* Takes a RPN logical expression and evaluates it as true or false
*
* @static
* @param string $expr RPN expression
* @param array $vars variables lookup table
* @return bool evaluation
*/
public static function evaluate_rpn_expression($expr, $vars)
{
// Operators
$unary = array(SC_Survey_Flow::LO_NOT);
$binary = array(SC_Survey_Flow::LO_AND, SC_Survey_Flow::LO_OR);
//Split expression into tokens
$tokens = SC_Survey_Flow::tokenise($expr);
$tokens = array_map(function ($val) {
return str_replace(SC_Survey_Flow::LITERAL, '', $val);
}, $tokens);
//print_r($tokens);
$stack = [];
$loop = 1;
foreach ($tokens as $t) {
if (in_array($t, $unary)) {
//Token is a unary operator
$r = array_pop($stack);
$result = SC_Survey_Flow::evaluate_unary_logic($r, $t);
$stack[] = $result;
} elseif (in_array($t, $binary)) {
//Token is a binary operator
$r1 = array_pop($stack);
$r2 = array_pop($stack);
$result = SC_Survey_Flow::evaluate_binary_logic($r1, $r2, $t);
$stack[] = $result;
} else {
//Token is a condition
$result = SC_Survey_Flow::evaluate_condition($t, $vars);
//echo 'token: '.$t.' === '.($result ? 'TRUE' : 'FALSE').'<br />';
$stack[] = $result;
}
$loop++;
}
return $stack[0];
}
}
}
## Get required content
switch ($pageType) {
case 'date':
break;
case 'survey':
$page->bool_ignore_defaults = config_var_exists($config, 'settings', 'ignoreDefaults') ? $config['settings']['ignoreDefaults'] : TRUE;
### Check for page id and reset survey if none exists
$firstPageID = $page->get_first_page_id();
if (isset($_GET['pid']) && strlen($_GET['pid']) > 0) {
$pageID = $_GET['pid'];
} else {
### Start survey
$pageID = $firstPageID;
SC_Survey_Flow::reset_survey($pageID, $initialAnswers);
}
break;
case 'thankyou':
### Forget device ID if web or data-entry, to allow staff to switch between the two
if ($_SESSION['deviceID'] === 'web' || $_SESSION['deviceID'] === 'data-entry') {
unset($_SESSION['deviceID']);
}
### Load outro into string
if (is_null($outroPath)) {
#### No outro - start survey
header('Location:' . $url_menu);
} elseif (isset($_SESSION['wrapper']['data'][$surveyID][$langCode]['outro.md'])) {
#### Load outro from session
$content = $_SESSION['wrapper']['data'][$surveyID][$langCode]['outro.md'];
} else {
