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<?php
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/**
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* @file
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* Conditional engine to process dependencies within the webform's conditionals.
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*/
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/**
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* Performs analysis and topological sorting on the conditionals.
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*/
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class WebformConditionals {
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// Define constants for the result of an analysis of the conditionals on
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// a page for a given set of input values. Determines whether the component
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// is always hidden, always shown, or may or may not be shown depending upon
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// other values on the same page. In the last case, the component needs to be
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// rendered on the page because at least one source component is on the same
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// page. The field will be hidden with JavaScript.
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const componentHidden = 0;
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const componentShown = 1;
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const componentDependent = 2;
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protected static $conditionals = array();
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protected $node;
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protected $topologicalOrder;
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protected $pageMap;
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protected $childrenMap;
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protected $visibilityMap;
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protected $requiredMap;
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protected $setMap;
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protected $markupMap;
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public $errors;
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/**
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* Creates and caches a WebformConditional for a given node.
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*/
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static function factory($node) {
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if (!isset(self::$conditionals[$node->nid])) {
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self::$conditionals[$node->nid] = new WebformConditionals($node);
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}
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return self::$conditionals[$node->nid];
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}
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/**
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* Constructs a WebformConditional.
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*/
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function __construct($node) {
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$this->node = $node;
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}
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/**
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* Sorts the conditionals into topological order.
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*
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* The "nodes" of the list are the conditionals, not the components that
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* they operate upon.
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*
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* The webform components must already be sorted into component tree order
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* before calling this method.
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*
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* See http://en.wikipedia.org/wiki/Topological_sorting
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*/
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protected function topologicalSort() {
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$components = $this->node->webform['components'];
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$conditionals = $this->node->webform['conditionals'];
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$errors = array();
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// Generate a component to conditional map for conditional targets.
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$cid_to_target_rgid = array();
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$cid_hidden = array();
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foreach ($conditionals as $rgid => $conditional) {
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foreach ($conditional['actions'] as $aid => $action) {
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$target_id = $action['target'];
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$cid_to_target_rgid[$target_id][$rgid] = $rgid;
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if ($action['action'] == 'show') {
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$cid_hidden[$target_id] = isset($cid_hidden[$target_id]) ? $cid_hidden[$target_id] + 1 : 1;
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if ($cid_hidden[$target_id] == 2) {
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$component = $components[$target_id];
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$errors[$component['page_num']][] = t('More than one conditional hides or shows component "@name".',
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array('@name' => $component['name']));
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}
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}
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}
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}
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// Generate T-Orders for each page
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$new_entry = array('in' => array(), 'out' => array(), 'rgid' => array());
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$page_num = 0;
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// If the first component is a page break, then no component is on page 1. Create empty arrays for page 1.
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$sorted = array(1 => array());
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$page_map = array(1 => array());
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$component = reset($components);
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while ($component) {
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$cid = $component['cid'];
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// Start a new page, if needed
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if ($component['page_num'] > $page_num ) {
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$page_num = $component['page_num'];
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// Create an empty list that will contain the sorted elements.
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// This list is known as L in the literature.
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$sorted[$page_num] = array();
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// Create an empty list of dependency nodes for this page.
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$nodes = array();
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}
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// Create the pageMap as a side benefit of generating the t-sort.
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$page_map[$page_num][$cid] = $cid;
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// Process component by adding it's conditional data to a component-tree-traversal order an index of:
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// - incoming dependencies = the source components for the conditions for this target component and
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// - outgoing dependencies = components which depend upon the target component
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// Note: Surprisingly, 0 is a valid rgid, as well as a valid rid. Use -1 as a semaphore.
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if (isset($cid_to_target_rgid[$cid])) {
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// The component is the target of conditional(s)
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foreach ($cid_to_target_rgid[$cid] as $rgid) {
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$conditional = $conditionals[$rgid];
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if (!isset($nodes[$cid])) {
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$nodes[$cid] = $new_entry;
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}
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$nodes[$cid]['rgid'][$rgid] = $rgid;
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foreach ($conditional['rules'] as $rule) {
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if ($rule['source_type'] == 'component') {
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$source_id = $rule['source'];
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if (!isset($nodes[$source_id])) {
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$nodes[$source_id] = $new_entry;
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}
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$nodes[$cid]['in'][$source_id] = $source_id;
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$nodes[$source_id]['out'][$cid] = $cid;
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$source_component = $components[$source_id];
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$source_pid = $source_component['pid'];
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if ($source_pid) {
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if (!isset($nodes[$source_pid])) {
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$nodes[$source_pid] = $new_entry;
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}
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// The rule source is within a parent fieldset. Create a dependency on the parent.
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$nodes[$source_pid]['out'][$source_id] = $source_id;
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$nodes[$source_id]['in'][$source_pid] = $source_pid;
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}
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if ($source_component['page_num'] > $page_num) {
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$errors[$page_num][] = t('A forward reference from page @from, %from to %to was found.',
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array(
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'%from' => $source_component['name'],
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'@from' => $source_component['page_num'],
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'%to' => $component['name'],
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));
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}
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elseif ($source_component['page_num'] == $page_num && $component['type'] == 'pagebreak') {
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$errors[$page_num][] = t('The page break %to can\'t be controlled by %from on the same page.',
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array(
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'%from' => $source_component['name'],
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'%to' => $component['name'],
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));
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}
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}
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}
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}
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}
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// Fetch the next component, if any.
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$component = next($components);
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// Finish any previous page already processed.
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if (!$component || $component['page_num'] > $page_num) {
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// Create a set of all components which have are not dependent upon anything.
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// This list is known as S in the literature.
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$start_nodes = array();
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foreach ($nodes as $id => $n) {
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if (!$n['in']) {
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$start_nodes[] = $id;
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}
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}
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// Process the start nodes, removing each one in turn from the queue.
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while ($start_nodes) {
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$id = array_shift($start_nodes);
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// If the node represents an actual conditional, it can now be added
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// to the end of the sorted order because anything it depends upon has
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// already been calcuated.
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if ($nodes[$id]['rgid']) {
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foreach ($nodes[$id]['rgid'] as $rgid) {
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$sorted[$page_num][] = array(
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'cid' => $id,
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'rgid' => $rgid,
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'name' => $components[$id]['name'],
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);
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}
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}
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// Any other nodes that depend upon this node may now have their dependency
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// on this node removed, since it has now been calculated.
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foreach ($nodes[$id]['out'] as $out_id) {
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unset($nodes[$out_id]['in'][$id]);
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if (!$nodes[$out_id]['in']) {
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$start_nodes[] = $out_id;
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}
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}
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// All out-going dependencies have been handled.
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$nodes[$id]['out'] = array();
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}
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// Check for a cyclic graph (circular dependency)
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foreach ($nodes as $id => $n) {
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if ($n['in'] || $n['out']) {
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$errors[$page_num][] = t('A circular reference involving %name was found.',
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array('%name' => $components[$id]['name']));
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}
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}
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} // End finshing previous page
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} // End component loop
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// Create an empty page map for the preview page.
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$page_map[$page_num + 1] = array();
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$this->topologicalOrder = $sorted;
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$this->errors = $errors;
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$this->pageMap = $page_map;
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}
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/**
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* Returns the (possibly cached) topological sort order.
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*/
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function getOrder() {
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if (!$this->topologicalOrder) {
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$this->topologicalSort();
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}
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return $this->topologicalOrder;
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}
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/**
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* Returns an index of components by page number.
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*/
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function getPageMap() {
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if (!$this->pageMap) {
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$this->topologicalSort();
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}
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return $this->pageMap;
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}
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/**
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* Displays and error messages from the previously-generated sort order.
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*
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* User's who can't fix the webform are shown a single, simplified message.
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*/
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function reportErrors() {
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$this->getOrder();
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if ($this->errors) {
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if (webform_node_update_access($this->node)) {
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foreach ($this->errors as $page_num => $page_errors) {
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drupal_set_message(format_plural(count($page_errors),
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'Conditional error on page @num:',
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'Conditional errors on page @num:',
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array('@num' => $page_num)) .
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'<br /><ul><li>' . implode('</li><li>', $page_errors) . '</li></ul>', 'warning');
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}
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}
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else {
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drupal_set_message(t('This form is improperly configured. Contact the administrator.'), 'warning');
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}
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}
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}
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/**
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* Creates and caches a map of the children of a each component.
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*
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* Called after the component tree has been made and then flattened again.
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* Alas, the children data is removed when the tree is flattened. The
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* components are indexecd by cid but in tree order. Because cid's are
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* numeric, they may not appear in IDE's or debuggers in their actual order.
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*/
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function getChildrenMap() {
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if (!$this->childrenMap) {
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$map = array();
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foreach ($this->node->webform['components'] as $cid => $component) {
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$pid = $component['pid'];
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if ($pid) {
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$map[$pid][] = $cid;
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}
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}
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$this->childrenMap = $map;
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}
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return $this->childrenMap;
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}
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/**
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* Deletes the value of the given component, plus any descendents.
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*/
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protected function deleteFamily(&$input_values, $parent_id, &$page_visiblity_page) {
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if (isset($input_values[$parent_id])) {
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$input_values[$parent_id] = NULL;
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}
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if (isset($this->childrenMap[$parent_id])) {
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foreach ($this->childrenMap[$parent_id] as $child_id) {
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$page_visiblity_page[$child_id] = $page_visiblity_page[$parent_id];
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$this->deleteFamily($input_values, $child_id, $page_visiblity_page);
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}
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}
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}
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protected $stackPointer;
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protected $resultStack;
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/**
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* Initializes an execution stack for a conditional group's rules and
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* sub-conditional rules.
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*/
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function executionStackInitialize($andor) {
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$this->stackPointer = -1;
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$this->resultStack = array();
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$this->executionStackPush($andor);
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}
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/**
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* Starts a new subconditional for the given and/or operator.
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*/
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function executionStackPush($andor) {
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$this->resultStack[++$this->stackPointer] = array(
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'results' => array(),
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'andor' => $andor,
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);
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}
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/**
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* Adds a rule's result to the current sub-condtional.
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*/
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function executionStackAccumulate($result) {
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$this->resultStack[$this->stackPointer]['results'][] = $result;
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}
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/**
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* Finishes a sub-conditional and adds the result to the parent stack frame.
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*/
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function executionStackPop() {
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// Calculate the and/or result.
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$stack_frame = $this->resultStack[$this->stackPointer];
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// Pop stack and protect against stack underflow.
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$this->stackPointer = max(0, $this->stackPointer - 1);
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$conditional_results = $stack_frame['results'];
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$filtered_results = array_filter($conditional_results);
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return $stack_frame['andor'] === 'or'
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? count($filtered_results) > 0
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: count($filtered_results) === count($conditional_results);
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}
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351
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352
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/**
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353
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* Executes the conditionals on a submission, removing any data which should
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* be hidden.
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*/
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function executeConditionals($input_values, $page_num = 0) {
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$this->getOrder();
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$this->getChildrenMap();
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if (!$this->visibilityMap || $page_num == 0) {
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// Create a new visitibily map, with all components shown.
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$this->visibilityMap = $this->pageMap;
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array_walk_recursive($this->visibilityMap, function (&$status) {
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$status = WebformConditionals::componentShown;
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});
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// Create empty required, set, and markup maps.
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$this->requiredMap = array_fill(1, count($this->pageMap), array());
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$this->setMap = $this->requiredMap;
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$this->markupMap = $this->requiredMap;
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}
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else {
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array_walk($this->visibilityMap[$page_num], function (&$status) {
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$status = WebformConditionals::componentShown;
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});
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$this->requiredMap[$page_num] = array();
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$this->setMap[$page_num] = array();
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$this->markupMap[$page_num] = array();
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}
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module_load_include('inc', 'webform', 'includes/webform.conditionals');
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380
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381
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$components = $this->node->webform['components'];
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$conditionals = $this->node->webform['conditionals'];
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$operators = webform_conditional_operators();
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$targetLocked = array();
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$first_page = $page_num ? $page_num : 1;
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$last_page = $page_num ? $page_num : count($this->topologicalOrder);
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for ($page = $first_page; $page <= $last_page; $page++) {
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foreach ($this->topologicalOrder[$page] as $conditional_spec) {
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$conditional = $conditionals[$conditional_spec['rgid']];
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$source_page_nums = array();
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393
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// Execute each comparison callback.
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$this->executionStackInitialize($conditional['andor']);
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foreach ($conditional['rules'] as $rule) {
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switch ($rule['source_type']) {
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case 'component':
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$source_component = $components[$rule['source']];
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$source_cid = $source_component['cid'];
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401
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402
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$source_values = array();
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if (isset($input_values[$source_cid])) {
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$component_value = $input_values[$source_cid];
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// For select_or_other components, use only the select values because $source_values must not be a nested array.
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// During preview, the array is already flattened.
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if ($source_component['type'] === 'select' &&
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!empty($source_component['extra']['other_option']) &&
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isset($component_value['select'])) {
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$component_value = $component_value['select'];
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}
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$source_values = is_array($component_value) ? $component_value : array($component_value);
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}
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// Determine the operator and callback.
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$conditional_type = webform_component_property($source_component['type'], 'conditional_type');
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$operator_info = $operators[$conditional_type];
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418
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// Perform the comparison callback and build the results for this group.
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$comparison_callback = $operator_info[$rule['operator']]['comparison callback'];
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// Contrib caching, such as entitycache, may have loaded the node
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422
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// without building it. It is possible that the component include file
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423
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// hasn't been included yet. See #2529246.
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webform_component_include($source_component['type']);
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425
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|
426
|
// Load missing include files for conditional types.
|
427
|
// In the case of the 'string', 'date', and 'time' conditional types, it is
|
428
|
// not necessary to load their include files for conditional behavior
|
429
|
// because the required functions are already loaded
|
430
|
// in webform.conditionals.inc.
|
431
|
switch ($conditional_type) {
|
432
|
case 'numeric':
|
433
|
module_load_include('inc', 'webform', 'components/number');
|
434
|
break;
|
435
|
case 'select':
|
436
|
module_load_include('inc', 'webform', 'components/select');
|
437
|
break;
|
438
|
}
|
439
|
|
440
|
$this->executionStackAccumulate($comparison_callback($source_values, $rule['value'], $source_component));
|
441
|
|
442
|
// Record page number to later determine any intra-page dependency on this source.
|
443
|
$source_page_nums[$source_component['page_num']] = $source_component['page_num'];
|
444
|
break;
|
445
|
case 'conditional_start':
|
446
|
$this->executionStackPush($rule['operator']);
|
447
|
break;
|
448
|
case 'conditional_end':
|
449
|
$this->executionStackAccumulate($this->executionStackPop());
|
450
|
break;
|
451
|
}
|
452
|
}
|
453
|
$conditional_result = $this->executionStackPop();
|
454
|
|
455
|
foreach ($conditional['actions'] as $action) {
|
456
|
$action_result = $action['invert'] ? !$conditional_result : $conditional_result;
|
457
|
$target = $action['target'];
|
458
|
$page_num = $components[$target]['page_num'];
|
459
|
switch ($action['action']) {
|
460
|
case 'show':
|
461
|
if (!$action_result) {
|
462
|
$this->visibilityMap[$page_num][$target] = in_array($page_num, $source_page_nums) ? self::componentDependent : self::componentHidden;
|
463
|
$this->deleteFamily($input_values, $target, $this->visibilityMap[$page_num]);
|
464
|
$targetLocked[$target] = TRUE;
|
465
|
}
|
466
|
break;
|
467
|
case 'require':
|
468
|
$this->requiredMap[$page_num][$target] = $action_result;
|
469
|
break;
|
470
|
case 'set':
|
471
|
if ($components[$target]['type'] == 'markup') {
|
472
|
$this->markupMap[$page_num][$target] = FALSE;
|
473
|
}
|
474
|
if ($action_result && empty($targetLocked[$target])) {
|
475
|
if ($components[$target]['type'] == 'markup') {
|
476
|
$this->markupMap[$page_num][$target] = $action['argument'];
|
477
|
}
|
478
|
else {
|
479
|
$input_values[$target] = isset($input_values[$target]) && is_array($input_values[$target])
|
480
|
? array($action['argument'])
|
481
|
: $action['argument'];
|
482
|
$this->setMap[$page_num][$target] = TRUE;
|
483
|
}
|
484
|
}
|
485
|
break;
|
486
|
}
|
487
|
}
|
488
|
|
489
|
|
490
|
} // End conditinal loop
|
491
|
} // End page loop
|
492
|
|
493
|
return $input_values;
|
494
|
}
|
495
|
|
496
|
/**
|
497
|
* Returns whether the conditionals have been executed yet.
|
498
|
*/
|
499
|
function isExecuted() {
|
500
|
return (boolean)($this->visibilityMap);
|
501
|
}
|
502
|
|
503
|
/**
|
504
|
* Returns whether a given component is always hidden, always shown, or might
|
505
|
* be shown depending upon other sources on the same page.
|
506
|
*
|
507
|
* Assumes that the conditionals have already been executed on the given page.
|
508
|
*
|
509
|
* @param integer $cid
|
510
|
* The component id of the component whose visibilty is being sought.
|
511
|
* @param integer $page_num
|
512
|
* The page number that the component is on.
|
513
|
* @return integer
|
514
|
* self::componentHidden, ...Shown, or ...Dependent.
|
515
|
*/
|
516
|
function componentVisibility($cid, $page_num) {
|
517
|
if (!$this->visibilityMap) {
|
518
|
// The conditionals have not yet been executed on a submission.
|
519
|
$this->executeConditionals(array(), 0);
|
520
|
watchdog('webform', 'WebformConditionals::componentVisibility called prior to evaluating a submission.', array(), WATCHDOG_ERROR);
|
521
|
}
|
522
|
return isset($this->visibilityMap[$page_num][$cid]) ? $this->visibilityMap[$page_num][$cid] : self::componentShown;
|
523
|
}
|
524
|
|
525
|
/**
|
526
|
* Returns whether a given page should be displayed. This requires any
|
527
|
* conditional for the page itself to be shown, plus at least one component
|
528
|
* within the page must be shown too. The first and preview pages are always
|
529
|
* shown, however.
|
530
|
*
|
531
|
* @param integer $page_num
|
532
|
* The page number that the component is on.
|
533
|
* @return integer
|
534
|
* self::componentHidden or ...Shown.
|
535
|
*/
|
536
|
function pageVisibility($page_num) {
|
537
|
$result = self::componentHidden;
|
538
|
if ($page_num == 1 || empty($this->visibilityMap[$page_num])) {
|
539
|
$result = self::componentShown;
|
540
|
}
|
541
|
elseif (($page_map = $this->pageMap[$page_num]) && $this->componentVisibility(reset($page_map), $page_num)) {
|
542
|
while ($cid = next($page_map)) {
|
543
|
if ($this->componentVisibility($cid, $page_num) != self::componentHidden) {
|
544
|
$result = self::componentShown;
|
545
|
break;
|
546
|
}
|
547
|
}
|
548
|
}
|
549
|
return $result;
|
550
|
}
|
551
|
|
552
|
/**
|
553
|
* Returns whether a given component is always required, always optional, or
|
554
|
* unchanged by conditional logic.
|
555
|
*
|
556
|
* Assumes that the conditionals have already been executed on the given page.
|
557
|
*
|
558
|
* @param integer $cid
|
559
|
* The component id of the component whose required state is being sought.
|
560
|
* @param integer $page_num
|
561
|
* The page number that the component is on.
|
562
|
* @return boolean
|
563
|
* Whether the component is required based on conditionals.
|
564
|
*/
|
565
|
function componentRequired($cid, $page_num) {
|
566
|
if (!$this->requiredMap) {
|
567
|
// The conditionals have not yet been executed on a submission.
|
568
|
$this->executeConditionals(array(), 0);
|
569
|
watchdog('webform', 'WebformConditionals::componentRequired called prior to evaluating a submission.', array(), WATCHDOG_ERROR);
|
570
|
}
|
571
|
return isset($this->requiredMap[$page_num][$cid]) ? $this->requiredMap[$page_num][$cid] : NULL;
|
572
|
}
|
573
|
|
574
|
/**
|
575
|
* Returns whether a given component has been set by conditional logic.
|
576
|
*
|
577
|
* Assumes that the conditionals have already been executed on the given page.
|
578
|
*
|
579
|
* @param integer $cid
|
580
|
* The component id of the component whose set state is being sought.
|
581
|
* @param integer $page_num
|
582
|
* The page number that the component is on.
|
583
|
* @return boolean
|
584
|
* Whether the component was set based on conditionals.
|
585
|
*/
|
586
|
function componentSet($cid, $page_num) {
|
587
|
if (!$this->setMap) {
|
588
|
// The conditionals have not yet been executed on a submission.
|
589
|
$this->executeConditionals(array(), 0);
|
590
|
watchdog('webform', 'WebformConditionals::componentSet called prior to evaluating a submission.', array(), WATCHDOG_ERROR);
|
591
|
}
|
592
|
return isset($this->setMap[$page_num][$cid]) ? $this->setMap[$page_num][$cid] : NULL;
|
593
|
}
|
594
|
|
595
|
/**
|
596
|
* Returns the calculated markup as set by conditional logic.
|
597
|
*
|
598
|
* Assumes that the conditionals have already been executed on the given page.
|
599
|
*
|
600
|
* @param integer $cid
|
601
|
* The component id of the component whose set state is being sought.
|
602
|
* @param integer $page_num
|
603
|
* The page number that the component is on.
|
604
|
* @return string
|
605
|
* The conditional markup, or NULL if none.
|
606
|
*/
|
607
|
function componentMarkup($cid, $page_num) {
|
608
|
if (!$this->markupMap) {
|
609
|
// The conditionals have not yet been executed on a submission.
|
610
|
$this->executeConditionals(array(), 0);
|
611
|
watchdog('webform', 'WebformConditionals::componentMarkup called prior to evaluating a submission.', array(), WATCHDOG_ERROR);
|
612
|
}
|
613
|
return isset($this->markupMap[$page_num][$cid]) ? $this->markupMap[$page_num][$cid] : NULL;
|
614
|
}
|
615
|
|
616
|
}
|