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<?php |
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namespace NoaaCapAlerts\Parser; |
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class IndexParser |
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{ |
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protected $xmlParser; |
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function __construct(XmlParser $xmlParser = null) |
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{ |
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if ($xmlParser === null) { |
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$this->xmlParser = new XmlParser(); |
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} else { |
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$this->xmlParser = $xmlParser; |
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} |
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} |
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public function parse(string $xml): array |
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{ |
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// parse XML into an array of alerts |
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$rawDataArray = $this->xmlParser->getArrayFromXml($xml); |
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$alertDataArray = $rawDataArray[0]['children']; |
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// Process each alert ("ENTRY") |
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$resultArray = array(); |
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foreach ($alertDataArray as $alert) { |
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if (!$this->isAlert($alert)) { |
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continue; |
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} |
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$parsedAlert = $this->parseAlert($alert); |
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$resultArray[] = $parsedAlert; |
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} |
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return $resultArray; |
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} |
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protected function isAlert(array $alert): bool |
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{ |
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return isset($alert['name']) && $alert['name'] == 'ENTRY'; |
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} |
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protected function parseAlert(array $alert): array |
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{ |
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$parsedAlert = array( |
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'idString' => '', |
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'idKey' => '', |
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'updatedDateTime' => null, |
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'publishedDateTime' => null, |
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'updatedTime' => '', |
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'publishedTime' => '', |
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'authorName' => '', |
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'title' => '', |
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'link' => '', |
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'summary' => '', |
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'capEvent' => '', |
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'capEffectiveTime' => '', |
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'capExpiresTime' => '', |
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'capEffectiveDateTime' => null, |
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'capExpiresDateTime' => null, |
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'capStatus' => '', |
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'capMsgType' => '', |
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'capCategory' => '', |
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'capUrgencyExpected' => '', |
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'capSeverity' => '', |
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'capCertainty' => '', |
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'capAreaDesc' => '', |
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'capPolygon' => '', |
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'capGeo' => array(), |
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'capGeoString' => '', |
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'vtec' => '', |
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); |
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// Loop through attributes and set values |
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foreach ($alert['children'] as $element) { |
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$elementName = $element['name']; |
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$elementAttrs = $element['attrs']; |
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if (isset($element['tagData'])) { |
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$elementData = $element['tagData']; |
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} else { |
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$elementData = ''; |
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} |
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switch ($elementName) { |
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case 'ID': |
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$parsedAlert['idString'] = $elementData; |
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break; |
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case 'UPDATED': |
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$parsedAlert['updatedDateTime'] = new \DateTime($elementData); |
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$parsedAlert['updatedTime'] = $parsedAlert['updatedDateTime']->format('Y-m-d H:i:s'); |
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break; |
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case 'PUBLISHED': |
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$parsedAlert['publishedDateTime'] = new \DateTime($elementData); |
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$parsedAlert['publishedTime'] = $parsedAlert['publishedDateTime']->format('Y-m-d H:i:s'); |
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break; |
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case 'AUTHOR': |
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$parsedAlert['authorName'] = $element['children'][0]['tagData']; |
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break; |
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case 'TITLE': |
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$parsedAlert['title'] = $elementData; |
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break; |
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case 'LINK': |
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$parsedAlert['link'] = $elementAttrs['HREF']; |
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break; |
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case 'SUMMARY': |
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$parsedAlert['summary'] = $elementData; |
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break; |
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case 'CAP:EVENT': |
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$parsedAlert['capEvent'] = $elementData; |
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break; |
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case 'CAP:EFFECTIVE': |
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$effectiveDateTime = new \DateTime($elementData); |
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$parsedAlert['capEffectiveTime'] = $effectiveDateTime->format('Y-m-d H:i:s'); |
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$parsedAlert['capEffectiveDateTime'] = $effectiveDateTime; |
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break; |
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case 'CAP:EXPIRES': |
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$expiresDateTime = new \DateTime($elementData); |
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$parsedAlert['capExpiresTime'] = $expiresDateTime->format('Y-m-d H:i:s'); |
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$parsedAlert['capExpiresDateTime'] = $expiresDateTime; |
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break; |
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case 'CAP:STATUS': |
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$parsedAlert['capStatus'] = $elementData; |
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break; |
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case 'CAP:MSGTYPE': |
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$parsedAlert['capMsgType'] = $elementData; |
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break; |
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case 'CAP:CATEGORY': |
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$parsedAlert['capCategory'] = $elementData; |
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break; |
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case 'CAP:URGENCY': |
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$parsedAlert['capUrgencyExpected'] = $elementData; |
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break; |
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case 'CAP:SEVERITY': |
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$parsedAlert['capSeverity'] = $elementData; |
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break; |
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case 'CAP:CERTAINTY': |
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$parsedAlert['capCertainty'] = $elementData; |
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break; |
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case 'CAP:AREADESC': |
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$parsedAlert['capAreaDesc'] = $elementData; |
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break; |
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case 'CAP:POLYGON': |
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$capPolygonString = $elementData; |
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$parsedAlert['capPolygon'] = explode(' ', $capPolygonString); |
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break; |
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case 'CAP:GEOCODE': |
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$geoArray = array(); |
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// parse into simple array |
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foreach ($element['children'] as $geo) { |
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if (isset($geo['tagData'])) { |
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$geoArray[] = $geo['tagData']; |
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} |
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} |
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$geoLocArray = $this->parseGeoArray($geoArray); |
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$parsedAlert['capGeoString'] = implode(', ', $geoArray); |
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$parsedAlert['capGeo'] = $geoLocArray; |
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break; |
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case 'CAP:PARAMETER': |
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// It appears only vtec is currently stored here |
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if (isset($element['children'][1]['tagData'])) { |
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$parsedAlert['vtec'] = $element['children'][1]['tagData']; |
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} |
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break; |
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} |
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$parsedAlert['idKey'] = $this->generateIdKey($parsedAlert['idString']); |
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} |
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return $parsedAlert; |
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} |
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protected function parseGeoArray(array $geoArray): array |
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{ |
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// organize array by format type |
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$locationFormatTypes = array( |
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'FIPS6', |
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'UGC', |
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); |
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$currentLocationKey = 'null'; |
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$geoLocArray = array(); |
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foreach ($geoArray as $geoLoc) { |
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if (in_array($geoLoc, $locationFormatTypes)) { |
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$currentLocationKey = $geoLoc; |
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$geoLocArray[$geoLoc] = array(); |
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} else { |
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$geoLocArray[$currentLocationKey] = explode(' ', $geoLoc); |
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} |
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} |
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return $geoLocArray; |
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} |
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protected function generateIdKey(string $idString): string |
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{ |
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// idString contains important data in it as well. |
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// Use it to generate a unique key for the alert. |
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// |
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// Example: |
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// alerts.weather.gov/cap/wwacapget.php?x=AK12539092A414.WinterWeatherAdvisory.125390A09AB0AK.AFGWSWNSB.a59f94b5da45867f6f45272a36df61cc |
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// |
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// The pieces of idString appears to be |
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// 0. State abrev + some strange timestamp format |
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// 1. Type |
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// 2. Another timestamp with state abrev. |
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// 3. ?? |
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// 4. Hash of some data (32 bit) |
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// |
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// Since 0,1,2, and 3 aren't unique on their own, but it looks like 4 is, I'll plan on using 0 and 4 just to be sure. |
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$idParts = explode('=', $idString); |
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$idSplit = explode('.', $idParts[1]); |
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$idKey = $idSplit[0] . '.' . $idSplit[4]; |
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return $idKey; |
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} |
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} |
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thtroyer /
noaa-cap-alerts
