function diff()
{
global $argc, $argv;
if ($argc != 3) {
usage();
}
$file = $argv[2];
if (file_exists($file)) {
$xml = @simplexml_load_file($file);
} else {
file_not_found($file);
}
if ($xml === false) {
bad_xml($file);
}
echo "Analysing {$file}...\n";
// Go through nodes and mark ways that have changed (we can easiky keep it in memory)
// rq: use floats or strings but not ints, since PHP_INT_MAX is too small on 32 bits systems
$impacted_ways = array();
$nodes = $xml->node;
foreach ($nodes as $node) {
$nodeid = (string) $node->attributes()->id;
$nodeaction = (string) $node->attributes()->action;
if ((double) $nodeid < 0 || $nodeaction === 'modify') {
$results = $xml->xpath("//way[count(nd[@ref='{$nodeid}'])>0]");
if (count($results)) {
foreach ($results as $way) {
$wayid = (string) $way->attributes()->id;
if (!isset($impacted_ways[$wayid])) {
$impacted_ways[$wayid] = 1;
}
}
}
}
}
// we go through ways, but only the ones that have a c2c:id attached
// (other are part of a relation)
$impacted_relations = array();
$ways = $xml->way;
foreach ($ways as $way) {
// If only the nodes of a way have been modified or deleted, the way itself is not marked
// as changed in josm. Let's check that.
$wayid = (string) $way->attributes()->id;
$propaged_modification = array_key_exists($wayid, $impacted_ways);
$state = state($way);
if ($propaged_modification && $state === 'NOCHANGE') {
$state = 'MODIFY';
}
// check if it has a c2c:id attached
// other ways are handled via their parent relation
$c2cid = c2cid($way);
if ($c2cid) {
for ($i = 0; $i < count($c2cid); $i++) {
$changes[$c2cid[$i]][$state][] = $wayid;
if (!isset($changes[$c2cid[$i]]['name'])) {
$changes[$c2cid[$i]]['name'] = c2cname($way, $i);
}
}
} else {
// determine if way has changed (either directly or via its nodes)
// if so, keep track of the related relations that will be considered modified
if ($state === 'MODIFY') {
$results = $xml->xpath("//relation[count(member[@ref='{$wayid}'])>0]");
if (count($results)) {
foreach ($results as $relation) {
$relationid = (string) $relation->attributes()->id;
if (!isset($impacted_relations[$relationid])) {
$impacted_relations[$relationid] = 1;
}
}
}
}
}
}
// we go through the relations
$relations = $xml->relation;
foreach ($relations as $relation) {
$relationid = (string) $relation->attributes()->id;
$propaged_modification = array_key_exists($relationid, $impacted_relations);
$state = state($relation);
if ($propaged_modification && $state === 'NOCHANGE') {
$state = 'MODIFY';
}
$c2cid = c2cid($relation);
if ($c2cid) {
for ($i = 0; $i < count($c2cid); $i++) {
$changes[$c2cid[$i]][$state][] = $relationid;
if (!isset($changes[$c2cid[$i]]['name'])) {
$changes[$c2cid[$i]]['name'] = c2cname($relation, $i);
}
}
} else {
die("Found a relation without c2c:id. Aborting...\n");
}
}
// display the changes in a human readable way
echo "\n";
foreach ($changes as $id => $change) {
$modifycount = isset($change['MODIFY']) ? count($change['MODIFY']) : 0;
$deletecount = isset($change['DELETE']) ? count($change['DELETE']) : 0;
$newcount = isset($change['NEW']) ? count($change['NEW']) : 0;
$nochangecount = isset($change['NOCHANGE']) ? count($change['NOCHANGE']) : 0;
// an area has been completely deleted
if ($deletecount > 0 && $modifycount == 0 && $newcount == 0 && $nochangecount == 0) {
echo $change['name'] . " ({$id}) has been deleted\n";
continue;
}
// a new area has been created
if ($newcount > 0 && $modifycount == 0 && $deletecount == 0 && $nochangecount == 0) {
echo $change['name'] . " ({$id}) has been created with {$newcount} polygon(s)\n";
continue;
}
// modified in various ways
if ($newcount > 0 || $modifycount > 0 || $deletecount > 0) {
echo $change['name'] . " ({$id}) has been changed\n";
continue;
}
}
}
$query .= " country='{$country}', ";
}
if ($postal_code) {
$query .= " postal_code='{$postal_code}', ";
}
if ($global_prefs) {
$global_prefs = str_replace("\\r\\n", "\n", $global_prefs);
$x = bad_xml($global_prefs, "<global_preferences>", "</global_preferences>");
if ($x) {
error("Invalid global preferences: {$x}");
}
$query .= " global_prefs='{$global_prefs}', ";
}
if ($project_prefs) {
$project_prefs = str_replace("\\r\\n", "\n", $project_prefs);
$x = bad_xml($project_prefs, "<project_preferences>", "</project_preferences>");
if ($x) {
xml_error(-112, "Invalid project preferences: {$x}");
}
$query .= " project_prefs='{$project_prefs}', ";
}
if ($url) {
$query .= " url='{$url}', ";
}
if ($send_email != null) {
$query .= " send_email='{$send_email}', ";
}
if ($show_hosts != null) {
$query .= " show_hosts='{$show_hosts}', ";
}
if (!is_null($teamid)) {
