bolt->update("sex=$sex, birth_year=$birth_year");
}
$course_doc = require_once($course->doc_file);
// The user clicked something on a view page.
// Make a record of it, and of the time
//
function finalize_view($user, $view_id, $action) {
if (!$view_id) return null;
$view = BoltView::lookup_id($view_id);
if (!$view) {
error_page("no view");
}
if ($view->user_id != $user->id) {
error_page("wrong user");
}
if (!$view->end_time) {
$now = time();
$view->update("end_time=$now, action=$action");
}
return $view;
}
function default_mode($item) {
return $item->is_exercise()?BOLT_MODE_SHOW:BOLT_MODE_LESSON;
}
// A page is being shown to the user; make a record of it
//
function create_view($user, $course, $iter, $mode, $prev_view_id) {
$now = time();
$item = $iter->item;
if (!$item) {
$item = null;
$item->name = '--end--';
}
$state = $iter->encode_state();
if ($user->bolt->debug) {
echo "Ending state: "; print_r($iter->state); echo "
\n";
}
return BoltView::insert("(user_id, course_id, item_name, start_time, mode, state, fraction_done, prev_view_id) values ($user->id, $course->id, '$item->name', $now, $mode, '$state', $iter->frac_done, $prev_view_id)");
}
// show a page saying the course has been completed
//
function show_finished_page($course, $view_id, $prev_view_id) {
page_head(null);
if (function_exists('bolt_header')) bolt_header("Course completed");
echo "Congratulation - you have completed this course.";
$prev = "id&action=prev&view_id=$view_id><< Prev";
echo "
";
if (function_exists('bolt_footer')) bolt_footer();
}
// show an item (lesson, exercise, answer page)
//
function show_item($iter, $user, $course, $view_id, $prev_view_id, $mode) {
global $bolt_ex_mode;
global $bolt_ex_index;
global $bolt_ex_score;
global $bolt_query_string;
$item = $iter->item;
page_head(null);
if (function_exists('bolt_header')) bolt_header($item->title);
$bolt_query_string = $item->query_string;
if ($item->is_exercise()) {
$bolt_ex_mode = $mode;
$bolt_ex_index = 0;
switch ($mode) {
case BOLT_MODE_SHOW:
echo "
";
break;
case BOLT_MODE_ANSWER:
require($item->filename);
if (function_exists('bolt_divide')) bolt_divide();
$next = "id&action=next&view_id=$view_id>Next >>";
$score_pct = number_format($bolt_ex_score*100);
echo "Score: $score_pct%";
break;
}
} else {
require_once($item->filename);
if (function_exists('bolt_divide')) bolt_divide();
$next = "id&action=next&view_id=$view_id>Next >>";
}
if ($prev_view_id) {
$prev = "id&action=prev&view_id=$view_id><< Prev";
} else {
$prev = "";
}
echo "
";
if (function_exists('bolt_footer')) bolt_footer();
$e = new BoltEnrollment();
$e->user_id = $user->id;
$e->course_id = $course->id;
$e->update("last_view_id=$view_id");
}
// Show the student the results of an old exercise; no navigation items
//
function show_answer_page($iter, $score) {
global $bolt_ex_mode;
global $bolt_ex_index;
global $bolt_query_string;
$bolt_ex_mode = BOLT_MODE_ANSWER;
$bolt_ex_index = 0;
$item = $iter->item;
page_head(null);
if (function_exists('bolt_header')) bolt_header($item->title);
$bolt_query_string = $item->query_string;
require_once($item->filename);
if (function_exists('bolt_divide')) bolt_divide();
$score_pct = number_format($score*100);
echo "Score: $score_pct%";
if (function_exists('bolt_footer')) bolt_footer();
}
function start_course($user, $course, $course_doc) {
BoltEnrollment::delete($user->id, $course->id);
$iter = new BoltIter($course_doc);
$iter->at();
$now = time();
$mode = default_mode($iter->item);
$view_id = create_view($user, $course, $iter, $mode, 0);
BoltEnrollment::insert("(create_time, user_id, course_id, last_view_id) values ($now, $user->id, $course->id, $view_id)");
show_item($iter, $user, $course, $view_id, 0, $mode);
}
$e = BoltEnrollment::lookup($user->id, $course_id);
switch ($action) {
case 'start':
if (info_incomplete($user)) {
request_info($user, $course);
exit();
}
if ($e) {
page_head("Confirm start");
echo "You are already enrolled in $course->name.
Are you sure you want to start from the beginning?
";
show_button(
"bolt_sched.php?action=start_confirm&course_id=$course->id",
"Yes",
"Start this course from the beginning"
);
page_tail();
exit();
}
case 'start_confirm':
start_course($user, $course, $course_doc);
break;
case 'update_info':
update_info();
start_course($user, $course, $course_doc);
case 'prev':
$view = finalize_view($user, $view_id, BOLT_ACTION_PREV);
if ($view->prev_view_id) {
$view = BoltView::lookup_id($view->prev_view_id);
$iter = new BoltIter($course_doc);
$iter->decode_state($view->state);
$iter->at();
$mode = default_mode($iter->item);
$view_id = create_view(
$user, $course, $iter, $mode, $view->prev_view_id
);
show_item($iter, $user, $course, $view_id, $view->prev_view_id, $mode);
} else {
error_page("At start of course");
}
break;
case 'next': // "next" button in lesson or exercise answer page
$view = finalize_view($user, $view_id, BOLT_ACTION_NEXT);
$iter = new BoltIter($course_doc);
$iter->decode_state($view->state);
if ($user->bolt->debug) {
echo "Initial state: "; print_r($iter->state); echo "
\n";
}
$iter->next();
if ($user->bolt->debug) {
echo "Item: "; print_r($iter->item); echo "
\n";
}
if ($iter->item) {
$state = $iter->encode_state();
$mode = default_mode($iter->item);
$view_id = create_view($user, $course, $iter, $mode, $view->id);
show_item($iter, $user, $course, $view_id, $view->id, $mode);
} else {
$iter->frac_done = 1;
$fin_view_id = create_view($user, $course, $iter, BOLT_MODE_FINISHED, $view_id);
$e->update("last_view_id=$fin_view_id");
show_finished_page($course, $fin_view_id, $view->id);
}
break;
case 'answer': // submit answer in exercise
$view = finalize_view($user, $view_id, BOLT_ACTION_SUBMIT);
if ($user->bolt->debug) {
echo "State: $view->state
\n";
}
$iter = new BoltIter($course_doc);
$iter->decode_state($view->state);
$iter->at();
if ($user->bolt->debug) {
echo "Item: "; print_r($iter->item); echo "
\n";
}
$item = $iter->item;
if (!$item->is_exercise()) {
print_r($item);
error_page("expected an exercise");
}
if ($view->item_name != $item->name) {
error_page("unexpected name");
}
// compute the score
$bolt_ex_query_string = $_SERVER['QUERY_STRING'];
$bolt_ex_mode = BOLT_MODE_SCORE;
$bolt_ex_index = 0;
$bolt_ex_score = 0;
$bolt_query_string = $item->query_string;
srand($view_id);
ob_start(); // turn on output buffering
require($item->filename);
ob_end_clean();
$bolt_ex_score /= $bolt_ex_index;
// make a record of the result
$qs = BoltDb::escape_string($_SERVER['QUERY_STRING']);
$result_id = BoltResult::insert(
"(view_id, score, response)
values ($view->id, $bolt_ex_score, '$qs')"
);
$view->update("result_id=$result_id");
// show the answer page
srand($view_id);
$view_id = create_view($user, $course, $iter, BOLT_MODE_ANSWER, $view->id);
show_item($iter, $user, $course, $view_id, $view->id, BOLT_MODE_ANSWER);
break;
case 'answer_page':
$view = BoltView::lookup_id($view_id);
$iter = new BoltIter($course_doc);
$iter->decode_state($view->state);
$iter->at();
if ($iter->item->name != $view->item_name) {
error_page("Exercise no longer exists in course");
}
$result = BoltResult::lookup_id($view->result_id);
srand($view_id);
$bolt_ex_query_string = $result->response;
show_answer_page($iter, $result->score);
break;
case 'course_home':
$view = finalize_view($user, $view_id, BOLT_ACTION_COURSE_HOME);
Header("Location: bolt.php");
break;
default:
$view = $e?BoltView::lookup_id($e->last_view_id):null;
if (!$view) {
start_course($user, $course, $course_doc);
break;
}
if ($view->mode == BOLT_MODE_FINISHED) {
show_finished_page($course, $view->id, $view->prev_view_id);
break;
}
$iter = new BoltIter($course_doc);
$iter->decode_state($view->state);
$iter->at();
$mode = $view->mode;
if ($view->item_name == $iter->item->name && ($mode == BOLT_MODE_ANSWER)) {
// if we're returning to an answer page,
// we need to look up the user's responses and the score.
//
$view_orig = BoltView::lookup_id($view->prev_view_id);
$result = BoltResult::lookup_id($view_orig->result_id);
srand($view_orig->id);
echo "reshow: $result->response";
$bolt_ex_query_string = $result->response;
$bolt_ex_score = $result->score;
$bolt_ex_index = 0;
$view_id = create_view($user, $course, $iter, $mode, $view_orig->id);
show_item($iter, $user, $course, $view_id, $view_orig->id, $mode);
} else {
$view_id = create_view($user, $course, $iter, $mode, $view->id);
show_item($iter, $user, $course, $view_id, $view->id, $mode);
}
break;
}
?>