[FEATURE] Add config and use composer autoloader.

We use composer already to install SabreDAV. Include config
composer.(json|lock) to install and manage more dependencies
in future.
Also provide PSR-4 autoloading for our namespaced classes, e.g.
"Zotlabs\". To regenerate autoloader maps use:
$ composer install --optimize-autoloader --no-dev

We could also remove the whole vendor/ folder from our repository, but
that would need changes in deployment and how to install hubs and needs
more discussion first.

4 files changed, 67 insertions, 61 deletions

diff --git a/vendor/sabre/xml/lib/Element/XmlFragment.php b/vendor/sabre/xml/lib/Element/XmlFragment.php
index 0abfac132..642241ca4 100644
--- a/vendor/sabre/xml/lib/Element/XmlFragment.php
+++ b/vendor/sabre/xml/lib/Element/XmlFragment.php
@@ -2,9 +2,9 @@
 
 namespace Sabre\Xml\Element;
 
+use Sabre\Xml\Element;
 use Sabre\Xml\Reader;
 use Sabre\Xml\Writer;
-use Sabre\Xml\Element;
 
 /**
  * The XmlFragment element allows you to extract a portion of your xml tree,
diff --git a/vendor/sabre/xml/lib/Reader.php b/vendor/sabre/xml/lib/Reader.php
index f35dc8537..92e5dba96 100644
--- a/vendor/sabre/xml/lib/Reader.php
+++ b/vendor/sabre/xml/lib/Reader.php
@@ -59,22 +59,26 @@ class Reader extends XMLReader {
         $previousEntityState = libxml_disable_entity_loader(true);
         $previousSetting = libxml_use_internal_errors(true);
 
-        // Really sorry about the silence operator, seems like I have no
-        // choice. See:
-        //
-        // https://bugs.php.net/bug.php?id=64230
-        while ($this->nodeType !== self::ELEMENT && @$this->read()) {
-            // noop
-        }
-        $result = $this->parseCurrentElement();
+        try {
+
+            // Really sorry about the silence operator, seems like I have no
+            // choice. See:
+            //
+            // https://bugs.php.net/bug.php?id=64230
+            while ($this->nodeType !== self::ELEMENT && @$this->read()) {
+                // noop
+            }
+            $result = $this->parseCurrentElement();
 
-        $errors = libxml_get_errors();
-        libxml_clear_errors();
-        libxml_use_internal_errors($previousSetting);
-        libxml_disable_entity_loader($previousEntityState);
+            $errors = libxml_get_errors();
+            libxml_clear_errors();
+            if ($errors) {
+                throw new LibXMLException($errors);
+            }
 
-        if ($errors) {
-            throw new LibXMLException($errors);
+        } finally {
+            libxml_use_internal_errors($previousSetting);
+            libxml_disable_entity_loader($previousEntityState);
         }
 
         return $result;
@@ -138,60 +142,62 @@ class Reader extends XMLReader {
             $this->elementMap = $elementMap;
         }
 
-        // Really sorry about the silence operator, seems like I have no
-        // choice. See:
-        //
-        // https://bugs.php.net/bug.php?id=64230
-        if (!@$this->read()) {
-            if (!is_null($elementMap)) {
-                $this->popContext();
-            }
-            return false;
-        }
-
-        while (true) {
-
-            if (!$this->isValid()) {
+        try {
 
+            // Really sorry about the silence operator, seems like I have no
+            // choice. See:
+            //
+            // https://bugs.php.net/bug.php?id=64230
+            if (!@$this->read()) {
                 $errors = libxml_get_errors();
-
+                libxml_clear_errors();
                 if ($errors) {
-                    libxml_clear_errors();
-                    if (!is_null($elementMap)) {
-                        $this->popContext();
-                    }
                     throw new LibXMLException($errors);
                 }
+                throw new ParseException('This should never happen (famous last words)');
             }
 
-            switch ($this->nodeType) {
-                case self::ELEMENT :
-                    $elements[] = $this->parseCurrentElement();
-                    break;
-                case self::TEXT :
-                case self::CDATA :
-                    $text .= $this->value;
-                    $this->read();
-                    break;
-                case self::END_ELEMENT :
-                    // Ensuring we are moving the cursor after the end element.
-                    $this->read();
-                    break 2;
-                case self::NONE :
-                    if (!is_null($elementMap)) {
-                        $this->popContext();
+            while (true) {
+
+                if (!$this->isValid()) {
+
+                    $errors = libxml_get_errors();
+
+                    if ($errors) {
+                        libxml_clear_errors();
+                        throw new LibXMLException($errors);
                     }
-                    throw new ParseException('We hit the end of the document prematurely. This likely means that some parser "eats" too many elements. Do not attempt to continue parsing.');
-                default :
-                    // Advance to the next element
-                    $this->read();
-                    break;
+                }
+
+                switch ($this->nodeType) {
+                    case self::ELEMENT :
+                        $elements[] = $this->parseCurrentElement();
+                        break;
+                    case self::TEXT :
+                    case self::CDATA :
+                        $text .= $this->value;
+                        $this->read();
+                        break;
+                    case self::END_ELEMENT :
+                        // Ensuring we are moving the cursor after the end element.
+                        $this->read();
+                        break 2;
+                    case self::NONE :
+                        throw new ParseException('We hit the end of the document prematurely. This likely means that some parser "eats" too many elements. Do not attempt to continue parsing.');
+                    default :
+                        // Advance to the next element
+                        $this->read();
+                        break;
+                }
+
             }
 
-        }
+        } finally {
+
+            if (!is_null($elementMap)) {
+                $this->popContext();
+            }
 
-        if (!is_null($elementMap)) {
-            $this->popContext();
         }
         return ($elements ? $elements : $text);
 
@@ -304,7 +310,7 @@ class Reader extends XMLReader {
 
         $deserializer = $this->elementMap[$name];
         if (is_subclass_of($deserializer, 'Sabre\\Xml\\XmlDeserializable')) {
-            return [ $deserializer, 'xmlDeserialize' ];
+            return [$deserializer, 'xmlDeserialize'];
         }
 
         if (is_callable($deserializer)) {
diff --git a/vendor/sabre/xml/lib/Version.php b/vendor/sabre/xml/lib/Version.php
index f199e7158..7edb40d67 100644
--- a/vendor/sabre/xml/lib/Version.php
+++ b/vendor/sabre/xml/lib/Version.php
@@ -14,6 +14,6 @@ class Version {
     /**
      * Full version number
      */
-    const VERSION = '1.4.1';
+    const VERSION = '1.5.0';
 
 }
diff --git a/vendor/sabre/xml/lib/Writer.php b/vendor/sabre/xml/lib/Writer.php
index adfbe0cb0..09d4cb321 100644
--- a/vendor/sabre/xml/lib/Writer.php
+++ b/vendor/sabre/xml/lib/Writer.php
@@ -127,7 +127,7 @@ class Writer extends XMLWriter {
 
             if (array_key_exists($namespace, $this->namespaceMap)) {
                 $result = $this->startElementNS(
-                    $this->namespaceMap[$namespace] === '' ?  null : $this->namespaceMap[$namespace],
+                    $this->namespaceMap[$namespace] === '' ? null : $this->namespaceMap[$namespace],
                     $localName,
                     null
                 );