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+<?php
+
+namespace OldSabre\VObject;
+
+/**
+ * VCALENDAR/VCARD reader
+ *
+ * This class reads the vobject file, and returns a full element tree.
+ *
+ * TODO: this class currently completely works 'statically'. This is pointless,
+ * and defeats OOP principals. Needs refactoring in a future version.
+ *
+ * @copyright Copyright (C) 2011-2015 fruux GmbH (https://fruux.com/).
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Reader {
+
+ /**
+ * If this option is passed to the reader, it will be less strict about the
+ * validity of the lines.
+ *
+ * Currently using this option just means, that it will accept underscores
+ * in property names.
+ */
+ const OPTION_FORGIVING = 1;
+
+ /**
+ * If this option is turned on, any lines we cannot parse will be ignored
+ * by the reader.
+ */
+ const OPTION_IGNORE_INVALID_LINES = 2;
+
+ /**
+ * Parses the file and returns the top component
+ *
+ * The options argument is a bitfield. Pass any of the OPTIONS constant to
+ * alter the parsers' behaviour.
+ *
+ * @param string $data
+ * @param int $options
+ * @return Node
+ */
+ static function read($data, $options = 0) {
+
+ // Normalizing newlines
+ $data = str_replace(array("\r","\n\n"), array("\n","\n"), $data);
+
+ $lines = explode("\n", $data);
+
+ // Unfolding lines
+ $lines2 = array();
+ foreach($lines as $line) {
+
+ // Skipping empty lines
+ if (!$line) continue;
+
+ if ($line[0]===" " || $line[0]==="\t") {
+ $lines2[count($lines2)-1].=substr($line,1);
+ } else {
+ $lines2[] = $line;
+ }
+
+ }
+
+ unset($lines);
+
+ reset($lines2);
+
+ return self::readLine($lines2, $options);
+
+ }
+
+ /**
+ * Reads and parses a single line.
+ *
+ * This method receives the full array of lines. The array pointer is used
+ * to traverse.
+ *
+ * This method returns null if an invalid line was encountered, and the
+ * IGNORE_INVALID_LINES option was turned on.
+ *
+ * @param array $lines
+ * @param int $options See the OPTIONS constants.
+ * @return Node
+ */
+ static private function readLine(&$lines, $options = 0) {
+
+ $line = current($lines);
+ $lineNr = key($lines);
+ next($lines);
+
+ // Components
+ if (strtoupper(substr($line,0,6)) === "BEGIN:") {
+
+ $componentName = strtoupper(substr($line,6));
+ $obj = Component::create($componentName);
+
+ $nextLine = current($lines);
+
+ while(strtoupper(substr($nextLine,0,4))!=="END:") {
+
+ $parsedLine = self::readLine($lines, $options);
+ $nextLine = current($lines);
+
+ if (is_null($parsedLine)) {
+ continue;
+ }
+ $obj->add($parsedLine);
+
+ if ($nextLine===false)
+ throw new ParseException('Invalid VObject. Document ended prematurely.');
+
+ }
+
+ // Checking component name of the 'END:' line.
+ if (substr($nextLine,4)!==$obj->name) {
+ throw new ParseException('Invalid VObject, expected: "END:' . $obj->name . '" got: "' . $nextLine . '"');
+ }
+ next($lines);
+
+ return $obj;
+
+ }
+
+ // Properties
+ //$result = preg_match('/(?P<name>[A-Z0-9-]+)(?:;(?P<parameters>^(?<!:):))(.*)$/',$line,$matches);
+
+ if ($options & self::OPTION_FORGIVING) {
+ $token = '[A-Z0-9-\._]+';
+ } else {
+ $token = '[A-Z0-9-\.]+';
+ }
+ $parameters = "(?:;(?P<parameters>([^:^\"]|\"([^\"]*)\")*))?";
+ $regex = "/^(?P<name>$token)$parameters:(?P<value>.*)$/i";
+
+ $result = preg_match($regex,$line,$matches);
+
+ if (!$result) {
+ if ($options & self::OPTION_IGNORE_INVALID_LINES) {
+ return null;
+ } else {
+ throw new ParseException('Invalid VObject, line ' . ($lineNr+1) . ' did not follow the icalendar/vcard format');
+ }
+ }
+
+ $propertyName = strtoupper($matches['name']);
+ $propertyValue = preg_replace_callback('#(\\\\(\\\\|N|n))#',function($matches) {
+ if ($matches[2]==='n' || $matches[2]==='N') {
+ return "\n";
+ } else {
+ return $matches[2];
+ }
+ }, $matches['value']);
+
+ $obj = Property::create($propertyName, $propertyValue);
+
+ if ($matches['parameters']) {
+
+ foreach(self::readParameters($matches['parameters']) as $param) {
+ $obj->add($param);
+ }
+
+ }
+
+ return $obj;
+
+
+ }
+
+ /**
+ * Reads a parameter list from a property
+ *
+ * This method returns an array of Parameter
+ *
+ * @param string $parameters
+ * @return array
+ */
+ static private function readParameters($parameters) {
+
+ $token = '[A-Z0-9-]+';
+
+ $paramValue = '(?P<paramValue>[^\"^;]*|"[^"]*")';
+
+ $regex = "/(?<=^|;)(?P<paramName>$token)(=$paramValue(?=$|;))?/i";
+ preg_match_all($regex, $parameters, $matches, PREG_SET_ORDER);
+
+ $params = array();
+ foreach($matches as $match) {
+
+ if (!isset($match['paramValue'])) {
+
+ $value = null;
+
+ } else {
+
+ $value = $match['paramValue'];
+
+ if (isset($value[0]) && $value[0]==='"') {
+ // Stripping quotes, if needed
+ $value = substr($value,1,strlen($value)-2);
+ }
+
+ $value = preg_replace_callback('#(\\\\(\\\\|N|n|;|,))#',function($matches) {
+ if ($matches[2]==='n' || $matches[2]==='N') {
+ return "\n";
+ } else {
+ return $matches[2];
+ }
+ }, $value);
+
+ }
+
+ $params[] = new Parameter($match['paramName'], $value);
+
+ }
+
+ return $params;
+
+ }
+
+
+}

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