diff --git a/externals/spyc/LICENSE b/externals/spyc/LICENSE
new file mode 100644
--- /dev/null
+++ b/externals/spyc/LICENSE
@@ -0,0 +1,21 @@
+The MIT License
+
+Copyright (c) 2011 Vladimir Andersen
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/externals/spyc/Spyc.php b/externals/spyc/Spyc.php
new file mode 100644
--- /dev/null
+++ b/externals/spyc/Spyc.php
@@ -0,0 +1,1147 @@
+<?php
+/**
+   * Spyc -- A Simple PHP YAML Class
+   * @version 0.5.1
+   * @author Vlad Andersen <vlad.andersen@gmail.com>
+   * @author Chris Wanstrath <chris@ozmm.org>
+   * @link https://github.com/mustangostang/spyc/
+   * @copyright Copyright 2005-2006 Chris Wanstrath, 2006-2011 Vlad Andersen
+   * @license http://www.opensource.org/licenses/mit-license.php MIT License
+   * @package Spyc
+   */
+
+if (!function_exists('spyc_load')) {
+  /**
+   * Parses YAML to array.
+   * @param string $string YAML string.
+   * @return array
+   */
+  function spyc_load ($string) {
+    return Spyc::YAMLLoadString($string);
+  }
+}
+
+if (!function_exists('spyc_load_file')) {
+  /**
+   * Parses YAML to array.
+   * @param string $file Path to YAML file.
+   * @return array
+   */
+  function spyc_load_file ($file) {
+    return Spyc::YAMLLoad($file);
+  }
+}
+
+if (!function_exists('spyc_dump')) {
+  /**
+   * Dumps array to YAML.
+   * @param array $data Array.
+   * @return string
+   */
+  function spyc_dump ($data) {
+    return Spyc::YAMLDump($data, false, false, true);
+  }
+}
+
+/**
+   * The Simple PHP YAML Class.
+   *
+   * This class can be used to read a YAML file and convert its contents
+   * into a PHP array.  It currently supports a very limited subsection of
+   * the YAML spec.
+   *
+   * Usage:
+   * <code>
+   *   $Spyc  = new Spyc;
+   *   $array = $Spyc->load($file);
+   * </code>
+   * or:
+   * <code>
+   *   $array = Spyc::YAMLLoad($file);
+   * </code>
+   * or:
+   * <code>
+   *   $array = spyc_load_file($file);
+   * </code>
+   * @package Spyc
+   */
+class Spyc {
+
+  // SETTINGS
+
+  const REMPTY = "\0\0\0\0\0";
+
+  /**
+   * Setting this to true will force YAMLDump to enclose any string value in
+   * quotes.  False by default.
+   *
+   * @var bool
+   */
+  public $setting_dump_force_quotes = false;
+
+  /**
+   * Setting this to true will forse YAMLLoad to use syck_load function when
+   * possible. False by default.
+   * @var bool
+   */
+  public $setting_use_syck_is_possible = false;
+
+
+
+  /**#@+
+  * @access private
+  * @var mixed
+  */
+  private $_dumpIndent;
+  private $_dumpWordWrap;
+  private $_containsGroupAnchor = false;
+  private $_containsGroupAlias = false;
+  private $path;
+  private $result;
+  private $LiteralPlaceHolder = '___YAML_Literal_Block___';
+  private $SavedGroups = array();
+  private $indent;
+  /**
+   * Path modifier that should be applied after adding current element.
+   * @var array
+   */
+  private $delayedPath = array();
+
+  /**#@+
+  * @access public
+  * @var mixed
+  */
+  public $_nodeId;
+
+/**
+ * Load a valid YAML string to Spyc.
+ * @param string $input
+ * @return array
+ */
+  public function load ($input) {
+    return $this->__loadString($input);
+  }
+
+ /**
+ * Load a valid YAML file to Spyc.
+ * @param string $file
+ * @return array
+ */
+  public function loadFile ($file) {
+    return $this->__load($file);
+  }
+
+  /**
+     * Load YAML into a PHP array statically
+     *
+     * The load method, when supplied with a YAML stream (string or file),
+     * will do its best to convert YAML in a file into a PHP array.  Pretty
+     * simple.
+     *  Usage:
+     *  <code>
+     *   $array = Spyc::YAMLLoad('lucky.yaml');
+     *   print_r($array);
+     *  </code>
+     * @access public
+     * @return array
+     * @param string $input Path of YAML file or string containing YAML
+     */
+  public static function YAMLLoad($input) {
+    $Spyc = new Spyc;
+    return $Spyc->__load($input);
+  }
+
+  /**
+     * Load a string of YAML into a PHP array statically
+     *
+     * The load method, when supplied with a YAML string, will do its best
+     * to convert YAML in a string into a PHP array.  Pretty simple.
+     *
+     * Note: use this function if you don't want files from the file system
+     * loaded and processed as YAML.  This is of interest to people concerned
+     * about security whose input is from a string.
+     *
+     *  Usage:
+     *  <code>
+     *   $array = Spyc::YAMLLoadString("---\n0: hello world\n");
+     *   print_r($array);
+     *  </code>
+     * @access public
+     * @return array
+     * @param string $input String containing YAML
+     */
+  public static function YAMLLoadString($input) {
+    $Spyc = new Spyc;
+    return $Spyc->__loadString($input);
+  }
+
+  /**
+     * Dump YAML from PHP array statically
+     *
+     * The dump method, when supplied with an array, will do its best
+     * to convert the array into friendly YAML.  Pretty simple.  Feel free to
+     * save the returned string as nothing.yaml and pass it around.
+     *
+     * Oh, and you can decide how big the indent is and what the wordwrap
+     * for folding is.  Pretty cool -- just pass in 'false' for either if
+     * you want to use the default.
+     *
+     * Indent's default is 2 spaces, wordwrap's default is 40 characters.  And
+     * you can turn off wordwrap by passing in 0.
+     *
+     * @access public
+     * @return string
+     * @param array $array PHP array
+     * @param int $indent Pass in false to use the default, which is 2
+     * @param int $wordwrap Pass in 0 for no wordwrap, false for default (40)
+     * @param int $no_opening_dashes Do not start YAML file with "---\n"
+     */
+  public static function YAMLDump($array, $indent = false, $wordwrap = false, $no_opening_dashes = false) {
+    $spyc = new Spyc;
+    return $spyc->dump($array, $indent, $wordwrap, $no_opening_dashes);
+  }
+
+
+  /**
+     * Dump PHP array to YAML
+     *
+     * The dump method, when supplied with an array, will do its best
+     * to convert the array into friendly YAML.  Pretty simple.  Feel free to
+     * save the returned string as tasteful.yaml and pass it around.
+     *
+     * Oh, and you can decide how big the indent is and what the wordwrap
+     * for folding is.  Pretty cool -- just pass in 'false' for either if
+     * you want to use the default.
+     *
+     * Indent's default is 2 spaces, wordwrap's default is 40 characters.  And
+     * you can turn off wordwrap by passing in 0.
+     *
+     * @access public
+     * @return string
+     * @param array $array PHP array
+     * @param int $indent Pass in false to use the default, which is 2
+     * @param int $wordwrap Pass in 0 for no wordwrap, false for default (40)
+     */
+  public function dump($array,$indent = false,$wordwrap = false, $no_opening_dashes = false) {
+    // Dumps to some very clean YAML.  We'll have to add some more features
+    // and options soon.  And better support for folding.
+
+    // New features and options.
+    if ($indent === false or !is_numeric($indent)) {
+      $this->_dumpIndent = 2;
+    } else {
+      $this->_dumpIndent = $indent;
+    }
+
+    if ($wordwrap === false or !is_numeric($wordwrap)) {
+      $this->_dumpWordWrap = 40;
+    } else {
+      $this->_dumpWordWrap = $wordwrap;
+    }
+
+    // New YAML document
+    $string = "";
+    if (!$no_opening_dashes) $string = "---\n";
+
+    // Start at the base of the array and move through it.
+    if ($array) {
+      $array = (array)$array;
+      $previous_key = -1;
+      foreach ($array as $key => $value) {
+        if (!isset($first_key)) $first_key = $key;
+        $string .= $this->_yamlize($key,$value,0,$previous_key, $first_key, $array);
+        $previous_key = $key;
+      }
+    }
+    return $string;
+  }
+
+  /**
+     * Attempts to convert a key / value array item to YAML
+     * @access private
+     * @return string
+     * @param $key The name of the key
+     * @param $value The value of the item
+     * @param $indent The indent of the current node
+     */
+  private function _yamlize($key,$value,$indent, $previous_key = -1, $first_key = 0, $source_array = null) {
+    if (is_array($value)) {
+      if (empty ($value))
+        return $this->_dumpNode($key, array(), $indent, $previous_key, $first_key, $source_array);
+      // It has children.  What to do?
+      // Make it the right kind of item
+      $string = $this->_dumpNode($key, self::REMPTY, $indent, $previous_key, $first_key, $source_array);
+      // Add the indent
+      $indent += $this->_dumpIndent;
+      // Yamlize the array
+      $string .= $this->_yamlizeArray($value,$indent);
+    } elseif (!is_array($value)) {
+      // It doesn't have children.  Yip.
+      $string = $this->_dumpNode($key, $value, $indent, $previous_key, $first_key, $source_array);
+    }
+    return $string;
+  }
+
+  /**
+     * Attempts to convert an array to YAML
+     * @access private
+     * @return string
+     * @param $array The array you want to convert
+     * @param $indent The indent of the current level
+     */
+  private function _yamlizeArray($array,$indent) {
+    if (is_array($array)) {
+      $string = '';
+      $previous_key = -1;
+      foreach ($array as $key => $value) {
+        if (!isset($first_key)) $first_key = $key;
+        $string .= $this->_yamlize($key, $value, $indent, $previous_key, $first_key, $array);
+        $previous_key = $key;
+      }
+      return $string;
+    } else {
+      return false;
+    }
+  }
+
+  /**
+     * Returns YAML from a key and a value
+     * @access private
+     * @return string
+     * @param $key The name of the key
+     * @param $value The value of the item
+     * @param $indent The indent of the current node
+     */
+  private function _dumpNode($key, $value, $indent, $previous_key = -1, $first_key = 0, $source_array = null) {
+    // do some folding here, for blocks
+    if (is_string ($value) && ((strpos($value,"\n") !== false || strpos($value,": ") !== false || strpos($value,"- ") !== false ||
+      strpos($value,"*") !== false || strpos($value,"#") !== false || strpos($value,"<") !== false || strpos($value,">") !== false || strpos ($value, '  ') !== false ||
+      strpos($value,"[") !== false || strpos($value,"]") !== false || strpos($value,"{") !== false || strpos($value,"}") !== false) || strpos($value,"&") !== false || strpos($value, "'") !== false || strpos($value, "!") === 0 ||
+      substr ($value, -1, 1) == ':')
+    ) {
+      $value = $this->_doLiteralBlock($value,$indent);
+    } else {
+      $value  = $this->_doFolding($value,$indent);
+    }
+
+    if ($value === array()) $value = '[ ]';
+    if ($value === "") $value = '""';
+    if (self::isTranslationWord($value)) {
+      $value = $this->_doLiteralBlock($value, $indent);
+    }
+    if (trim ($value) != $value)
+       $value = $this->_doLiteralBlock($value,$indent);
+
+    if (is_bool($value)) {
+       $value = $value ? "true" : "false";
+    }
+
+    if ($value === null) $value = 'null';
+    if ($value === "'" . self::REMPTY . "'") $value = null;
+
+    $spaces = str_repeat(' ',$indent);
+
+    //if (is_int($key) && $key - 1 == $previous_key && $first_key===0) {
+    if (is_array ($source_array) && array_keys($source_array) === range(0, count($source_array) - 1)) {
+      // It's a sequence
+      $string = $spaces.'- '.$value."\n";
+    } else {
+      // if ($first_key===0)  throw new Exception('Keys are all screwy.  The first one was zero, now it\'s "'. $key .'"');
+      // It's mapped
+      if (strpos($key, ":") !== false || strpos($key, "#") !== false) { $key = '"' . $key . '"'; }
+      $string = rtrim ($spaces.$key.': '.$value)."\n";
+    }
+    return $string;
+  }
+
+  /**
+     * Creates a literal block for dumping
+     * @access private
+     * @return string
+     * @param $value
+     * @param $indent int The value of the indent
+     */
+  private function _doLiteralBlock($value,$indent) {
+    if ($value === "\n") return '\n';
+    if (strpos($value, "\n") === false && strpos($value, "'") === false) {
+      return sprintf ("'%s'", $value);
+    }
+    if (strpos($value, "\n") === false && strpos($value, '"') === false) {
+      return sprintf ('"%s"', $value);
+    }
+    $exploded = explode("\n",$value);
+    $newValue = '|';
+    $indent  += $this->_dumpIndent;
+    $spaces   = str_repeat(' ',$indent);
+    foreach ($exploded as $line) {
+      $newValue .= "\n" . $spaces . ($line);
+    }
+    return $newValue;
+  }
+
+  /**
+     * Folds a string of text, if necessary
+     * @access private
+     * @return string
+     * @param $value The string you wish to fold
+     */
+  private function _doFolding($value,$indent) {
+    // Don't do anything if wordwrap is set to 0
+
+    if ($this->_dumpWordWrap !== 0 && is_string ($value) && strlen($value) > $this->_dumpWordWrap) {
+      $indent += $this->_dumpIndent;
+      $indent = str_repeat(' ',$indent);
+      $wrapped = wordwrap($value,$this->_dumpWordWrap,"\n$indent");
+      $value   = ">\n".$indent.$wrapped;
+    } else {
+      if ($this->setting_dump_force_quotes && is_string ($value) && $value !== self::REMPTY)
+        $value = '"' . $value . '"';
+      if (is_numeric($value) && is_string($value))
+        $value = '"' . $value . '"';
+    }
+
+
+    return $value;
+  }
+
+  private function isTrueWord($value) {
+    $words = self::getTranslations(array('true', 'on', 'yes', 'y'));
+    return in_array($value, $words, true);
+  }
+
+  private function isFalseWord($value) {
+    $words = self::getTranslations(array('false', 'off', 'no', 'n'));
+    return in_array($value, $words, true);
+  }
+
+  private function isNullWord($value) {
+    $words = self::getTranslations(array('null', '~'));
+    return in_array($value, $words, true);
+  }
+
+  private function isTranslationWord($value) {
+    return (
+      self::isTrueWord($value)  ||
+      self::isFalseWord($value) ||
+      self::isNullWord($value)
+    );
+  }
+
+  /**
+     * Coerce a string into a native type
+     * Reference: http://yaml.org/type/bool.html
+     * TODO: Use only words from the YAML spec.
+     * @access private
+     * @param $value The value to coerce
+     */
+  private function coerceValue(&$value) {
+    if (self::isTrueWord($value)) {
+      $value = true;
+    } else if (self::isFalseWord($value)) {
+      $value = false;
+    } else if (self::isNullWord($value)) {
+      $value = null;
+    }
+  }
+
+  /**
+     * Given a set of words, perform the appropriate translations on them to
+     * match the YAML 1.1 specification for type coercing.
+     * @param $words The words to translate
+     * @access private
+     */
+  private static function getTranslations(array $words) {
+    $result = array();
+    foreach ($words as $i) {
+      $result = array_merge($result, array(ucfirst($i), strtoupper($i), strtolower($i)));
+    }
+    return $result;
+  }
+
+// LOADING FUNCTIONS
+
+  private function __load($input) {
+    $Source = $this->loadFromSource($input);
+    return $this->loadWithSource($Source);
+  }
+
+  private function __loadString($input) {
+    $Source = $this->loadFromString($input);
+    return $this->loadWithSource($Source);
+  }
+
+  private function loadWithSource($Source) {
+    if (empty ($Source)) return array();
+    if ($this->setting_use_syck_is_possible && function_exists ('syck_load')) {
+      $array = syck_load (implode ("\n", $Source));
+      return is_array($array) ? $array : array();
+    }
+
+    $this->path = array();
+    $this->result = array();
+
+    $cnt = count($Source);
+    for ($i = 0; $i < $cnt; $i++) {
+      $line = $Source[$i];
+
+      $this->indent = strlen($line) - strlen(ltrim($line));
+      $tempPath = $this->getParentPathByIndent($this->indent);
+      $line = self::stripIndent($line, $this->indent);
+      if (self::isComment($line)) continue;
+      if (self::isEmpty($line)) continue;
+      $this->path = $tempPath;
+
+      $literalBlockStyle = self::startsLiteralBlock($line);
+      if ($literalBlockStyle) {
+        $line = rtrim ($line, $literalBlockStyle . " \n");
+        $literalBlock = '';
+        $line .= ' '.$this->LiteralPlaceHolder;
+        $literal_block_indent = strlen($Source[$i+1]) - strlen(ltrim($Source[$i+1]));
+        while (++$i < $cnt && $this->literalBlockContinues($Source[$i], $this->indent)) {
+          $literalBlock = $this->addLiteralLine($literalBlock, $Source[$i], $literalBlockStyle, $literal_block_indent);
+        }
+        $i--;
+      }
+
+      // Strip out comments
+      if (strpos ($line, '#')) {
+          $line = preg_replace('/\s*#([^"\']+)$/','',$line);
+      }
+
+      while (++$i < $cnt && self::greedilyNeedNextLine($line)) {
+        $line = rtrim ($line, " \n\t\r") . ' ' . ltrim ($Source[$i], " \t");
+      }
+      $i--;
+
+      $lineArray = $this->_parseLine($line);
+
+      if ($literalBlockStyle)
+        $lineArray = $this->revertLiteralPlaceHolder ($lineArray, $literalBlock);
+
+      $this->addArray($lineArray, $this->indent);
+
+      foreach ($this->delayedPath as $indent => $delayedPath)
+        $this->path[$indent] = $delayedPath;
+
+      $this->delayedPath = array();
+
+    }
+    return $this->result;
+  }
+
+  private function loadFromSource ($input) {
+    if (!empty($input) && strpos($input, "\n") === false && file_exists($input))
+      $input = file_get_contents($input);
+
+    return $this->loadFromString($input);
+  }
+
+  private function loadFromString ($input) {
+    $lines = explode("\n",$input);
+    foreach ($lines as $k => $_) {
+      $lines[$k] = rtrim ($_, "\r");
+    }
+    return $lines;
+  }
+
+  /**
+     * Parses YAML code and returns an array for a node
+     * @access private
+     * @return array
+     * @param string $line A line from the YAML file
+     */
+  private function _parseLine($line) {
+    if (!$line) return array();
+    $line = trim($line);
+    if (!$line) return array();
+
+    $array = array();
+
+    $group = $this->nodeContainsGroup($line);
+    if ($group) {
+      $this->addGroup($line, $group);
+      $line = $this->stripGroup ($line, $group);
+    }
+
+    if ($this->startsMappedSequence($line))
+      return $this->returnMappedSequence($line);
+
+    if ($this->startsMappedValue($line))
+      return $this->returnMappedValue($line);
+
+    if ($this->isArrayElement($line))
+     return $this->returnArrayElement($line);
+
+    if ($this->isPlainArray($line))
+     return $this->returnPlainArray($line);
+
+
+    return $this->returnKeyValuePair($line);
+
+  }
+
+  /**
+     * Finds the type of the passed value, returns the value as the new type.
+     * @access private
+     * @param string $value
+     * @return mixed
+     */
+  private function _toType($value) {
+    if ($value === '') return "";
+    $first_character = $value[0];
+    $last_character = substr($value, -1, 1);
+
+    $is_quoted = false;
+    do {
+      if (!$value) break;
+      if ($first_character != '"' && $first_character != "'") break;
+      if ($last_character != '"' && $last_character != "'") break;
+      $is_quoted = true;
+    } while (0);
+
+    if ($is_quoted) {
+      $value = str_replace('\n', "\n", $value);
+      return strtr(substr ($value, 1, -1), array ('\\"' => '"', '\'\'' => '\'', '\\\'' => '\''));
+    }
+
+    if (strpos($value, ' #') !== false && !$is_quoted)
+      $value = preg_replace('/\s+#(.+)$/','',$value);
+
+    if ($first_character == '[' && $last_character == ']') {
+      // Take out strings sequences and mappings
+      $innerValue = trim(substr ($value, 1, -1));
+      if ($innerValue === '') return array();
+      $explode = $this->_inlineEscape($innerValue);
+      // Propagate value array
+      $value  = array();
+      foreach ($explode as $v) {
+        $value[] = $this->_toType($v);
+      }
+      return $value;
+    }
+
+    if (strpos($value,': ')!==false && $first_character != '{') {
+      $array = explode(': ',$value);
+      $key   = trim($array[0]);
+      array_shift($array);
+      $value = trim(implode(': ',$array));
+      $value = $this->_toType($value);
+      return array($key => $value);
+    }
+
+    if ($first_character == '{' && $last_character == '}') {
+      $innerValue = trim(substr ($value, 1, -1));
+      if ($innerValue === '') return array();
+      // Inline Mapping
+      // Take out strings sequences and mappings
+      $explode = $this->_inlineEscape($innerValue);
+      // Propagate value array
+      $array = array();
+      foreach ($explode as $v) {
+        $SubArr = $this->_toType($v);
+        if (empty($SubArr)) continue;
+        if (is_array ($SubArr)) {
+          $array[key($SubArr)] = $SubArr[key($SubArr)]; continue;
+        }
+        $array[] = $SubArr;
+      }
+      return $array;
+    }
+
+    if ($value == 'null' || $value == 'NULL' || $value == 'Null' || $value == '' || $value == '~') {
+      return null;
+    }
+
+    if ( is_numeric($value) && preg_match ('/^(-|)[1-9]+[0-9]*$/', $value) ){
+      $intvalue = (int)$value;
+      if ($intvalue != PHP_INT_MAX)
+        $value = $intvalue;
+      return $value;
+    }
+
+    if (is_numeric($value) && preg_match('/^0[xX][0-9a-fA-F]+$/', $value)) {
+      // Hexadecimal value.
+      return hexdec($value);
+    }
+
+    $this->coerceValue($value);
+
+    if (is_numeric($value)) {
+      if ($value === '0') return 0;
+      if (rtrim ($value, 0) === $value)
+        $value = (float)$value;
+      return $value;
+    }
+
+    return $value;
+  }
+
+  /**
+     * Used in inlines to check for more inlines or quoted strings
+     * @access private
+     * @return array
+     */
+  private function _inlineEscape($inline) {
+    // There's gotta be a cleaner way to do this...
+    // While pure sequences seem to be nesting just fine,
+    // pure mappings and mappings with sequences inside can't go very
+    // deep.  This needs to be fixed.
+
+    $seqs = array();
+    $maps = array();
+    $saved_strings = array();
+    $saved_empties = array();
+
+    // Check for empty strings
+    $regex = '/("")|(\'\')/';
+    if (preg_match_all($regex,$inline,$strings)) {
+      $saved_empties = $strings[0];
+      $inline  = preg_replace($regex,'YAMLEmpty',$inline);
+    }
+    unset($regex);
+
+    // Check for strings
+    $regex = '/(?:(")|(?:\'))((?(1)[^"]+|[^\']+))(?(1)"|\')/';
+    if (preg_match_all($regex,$inline,$strings)) {
+      $saved_strings = $strings[0];
+      $inline  = preg_replace($regex,'YAMLString',$inline);
+    }
+    unset($regex);
+
+    // echo $inline;
+
+    $i = 0;
+    do {
+
+    // Check for sequences
+    while (preg_match('/\[([^{}\[\]]+)\]/U',$inline,$matchseqs)) {
+      $seqs[] = $matchseqs[0];
+      $inline = preg_replace('/\[([^{}\[\]]+)\]/U', ('YAMLSeq' . (count($seqs) - 1) . 's'), $inline, 1);
+    }
+
+    // Check for mappings
+    while (preg_match('/{([^\[\]{}]+)}/U',$inline,$matchmaps)) {
+      $maps[] = $matchmaps[0];
+      $inline = preg_replace('/{([^\[\]{}]+)}/U', ('YAMLMap' . (count($maps) - 1) . 's'), $inline, 1);
+    }
+
+    if ($i++ >= 10) break;
+
+    } while (strpos ($inline, '[') !== false || strpos ($inline, '{') !== false);
+
+    $explode = explode(',',$inline);
+    $explode = array_map('trim', $explode);
+    $stringi = 0; $i = 0;
+
+    while (1) {
+
+    // Re-add the sequences
+    if (!empty($seqs)) {
+      foreach ($explode as $key => $value) {
+        if (strpos($value,'YAMLSeq') !== false) {
+          foreach ($seqs as $seqk => $seq) {
+            $explode[$key] = str_replace(('YAMLSeq'.$seqk.'s'),$seq,$value);
+            $value = $explode[$key];
+          }
+        }
+      }
+    }
+
+    // Re-add the mappings
+    if (!empty($maps)) {
+      foreach ($explode as $key => $value) {
+        if (strpos($value,'YAMLMap') !== false) {
+          foreach ($maps as $mapk => $map) {
+            $explode[$key] = str_replace(('YAMLMap'.$mapk.'s'), $map, $value);
+            $value = $explode[$key];
+          }
+        }
+      }
+    }
+
+
+    // Re-add the strings
+    if (!empty($saved_strings)) {
+      foreach ($explode as $key => $value) {
+        while (strpos($value,'YAMLString') !== false) {
+          $explode[$key] = preg_replace('/YAMLString/',$saved_strings[$stringi],$value, 1);
+          unset($saved_strings[$stringi]);
+          ++$stringi;
+          $value = $explode[$key];
+        }
+      }
+    }
+
+
+    // Re-add the empties
+    if (!empty($saved_empties)) {
+      foreach ($explode as $key => $value) {
+        while (strpos($value,'YAMLEmpty') !== false) {
+          $explode[$key] = preg_replace('/YAMLEmpty/', '', $value, 1);
+          $value = $explode[$key];
+        }
+      }
+    }
+
+    $finished = true;
+    foreach ($explode as $key => $value) {
+      if (strpos($value,'YAMLSeq') !== false) {
+        $finished = false; break;
+      }
+      if (strpos($value,'YAMLMap') !== false) {
+        $finished = false; break;
+      }
+      if (strpos($value,'YAMLString') !== false) {
+        $finished = false; break;
+      }
+      if (strpos($value,'YAMLEmpty') !== false) {
+        $finished = false; break;
+      }
+    }
+    if ($finished) break;
+
+    $i++;
+    if ($i > 10)
+      break; // Prevent infinite loops.
+    }
+
+
+    return $explode;
+  }
+
+  private function literalBlockContinues ($line, $lineIndent) {
+    if (!trim($line)) return true;
+    if (strlen($line) - strlen(ltrim($line)) > $lineIndent) return true;
+    return false;
+  }
+
+  private function referenceContentsByAlias ($alias) {
+    do {
+      if (!isset($this->SavedGroups[$alias])) { echo "Bad group name: $alias."; break; }
+      $groupPath = $this->SavedGroups[$alias];
+      $value = $this->result;
+      foreach ($groupPath as $k) {
+        $value = $value[$k];
+      }
+    } while (false);
+    return $value;
+  }
+
+  private function addArrayInline ($array, $indent) {
+      $CommonGroupPath = $this->path;
+      if (empty ($array)) return false;
+
+      foreach ($array as $k => $_) {
+        $this->addArray(array($k => $_), $indent);
+        $this->path = $CommonGroupPath;
+      }
+      return true;
+  }
+
+  private function addArray ($incoming_data, $incoming_indent) {
+
+   // print_r ($incoming_data);
+
+    if (count ($incoming_data) > 1)
+      return $this->addArrayInline ($incoming_data, $incoming_indent);
+
+    $key = key ($incoming_data);
+    $value = isset($incoming_data[$key]) ? $incoming_data[$key] : null;
+    if ($key === '__!YAMLZero') $key = '0';
+
+    if ($incoming_indent == 0 && !$this->_containsGroupAlias && !$this->_containsGroupAnchor) { // Shortcut for root-level values.
+      if ($key || $key === '' || $key === '0') {
+        $this->result[$key] = $value;
+      } else {
+        $this->result[] = $value; end ($this->result); $key = key ($this->result);
+      }
+      $this->path[$incoming_indent] = $key;
+      return;
+    }
+
+
+
+    $history = array();
+    // Unfolding inner array tree.
+    $history[] = $_arr = $this->result;
+    foreach ($this->path as $k) {
+      $history[] = $_arr = $_arr[$k];
+    }
+
+    if ($this->_containsGroupAlias) {
+      $value = $this->referenceContentsByAlias($this->_containsGroupAlias);
+      $this->_containsGroupAlias = false;
+    }
+
+
+    // Adding string or numeric key to the innermost level or $this->arr.
+    if (is_string($key) && $key == '<<') {
+      if (!is_array ($_arr)) { $_arr = array (); }
+
+      $_arr = array_merge ($_arr, $value);
+    } else if ($key || $key === '' || $key === '0') {
+      if (!is_array ($_arr))
+        $_arr = array ($key=>$value);
+      else
+        $_arr[$key] = $value;
+    } else {
+      if (!is_array ($_arr)) { $_arr = array ($value); $key = 0; }
+      else { $_arr[] = $value; end ($_arr); $key = key ($_arr); }
+    }
+
+    $reverse_path = array_reverse($this->path);
+    $reverse_history = array_reverse ($history);
+    $reverse_history[0] = $_arr;
+    $cnt = count($reverse_history) - 1;
+    for ($i = 0; $i < $cnt; $i++) {
+      $reverse_history[$i+1][$reverse_path[$i]] = $reverse_history[$i];
+    }
+    $this->result = $reverse_history[$cnt];
+
+    $this->path[$incoming_indent] = $key;
+
+    if ($this->_containsGroupAnchor) {
+      $this->SavedGroups[$this->_containsGroupAnchor] = $this->path;
+      if (is_array ($value)) {
+        $k = key ($value);
+        if (!is_int ($k)) {
+          $this->SavedGroups[$this->_containsGroupAnchor][$incoming_indent + 2] = $k;
+        }
+      }
+      $this->_containsGroupAnchor = false;
+    }
+
+  }
+
+  private static function startsLiteralBlock ($line) {
+    $lastChar = substr (trim($line), -1);
+    if ($lastChar != '>' && $lastChar != '|') return false;
+    if ($lastChar == '|') return $lastChar;
+    // HTML tags should not be counted as literal blocks.
+    if (preg_match ('#<.*?>$#', $line)) return false;
+    return $lastChar;
+  }
+
+  private static function greedilyNeedNextLine($line) {
+    $line = trim ($line);
+    if (!strlen($line)) return false;
+    if (substr ($line, -1, 1) == ']') return false;
+    if ($line[0] == '[') return true;
+    if (preg_match ('#^[^:]+?:\s*\[#', $line)) return true;
+    return false;
+  }
+
+  private function addLiteralLine ($literalBlock, $line, $literalBlockStyle, $indent = -1) {
+    $line = self::stripIndent($line, $indent);
+    if ($literalBlockStyle !== '|') {
+        $line = self::stripIndent($line);
+    }
+    $line = rtrim ($line, "\r\n\t ") . "\n";
+    if ($literalBlockStyle == '|') {
+      return $literalBlock . $line;
+    }
+    if (strlen($line) == 0)
+      return rtrim($literalBlock, ' ') . "\n";
+    if ($line == "\n" && $literalBlockStyle == '>') {
+      return rtrim ($literalBlock, " \t") . "\n";
+    }
+    if ($line != "\n")
+      $line = trim ($line, "\r\n ") . " ";
+    return $literalBlock . $line;
+  }
+
+   function revertLiteralPlaceHolder ($lineArray, $literalBlock) {
+     foreach ($lineArray as $k => $_) {
+      if (is_array($_))
+        $lineArray[$k] = $this->revertLiteralPlaceHolder ($_, $literalBlock);
+      else if (substr($_, -1 * strlen ($this->LiteralPlaceHolder)) == $this->LiteralPlaceHolder)
+           $lineArray[$k] = rtrim ($literalBlock, " \r\n");
+     }
+     return $lineArray;
+   }
+
+  private static function stripIndent ($line, $indent = -1) {
+    if ($indent == -1) $indent = strlen($line) - strlen(ltrim($line));
+    return substr ($line, $indent);
+  }
+
+  private function getParentPathByIndent ($indent) {
+    if ($indent == 0) return array();
+    $linePath = $this->path;
+    do {
+      end($linePath); $lastIndentInParentPath = key($linePath);
+      if ($indent <= $lastIndentInParentPath) array_pop ($linePath);
+    } while ($indent <= $lastIndentInParentPath);
+    return $linePath;
+  }
+
+
+  private function clearBiggerPathValues ($indent) {
+
+
+    if ($indent == 0) $this->path = array();
+    if (empty ($this->path)) return true;
+
+    foreach ($this->path as $k => $_) {
+      if ($k > $indent) unset ($this->path[$k]);
+    }
+
+    return true;
+  }
+
+
+  private static function isComment ($line) {
+    if (!$line) return false;
+    if ($line[0] == '#') return true;
+    if (trim($line, " \r\n\t") == '---') return true;
+    return false;
+  }
+
+  private static function isEmpty ($line) {
+    return (trim ($line) === '');
+  }
+
+
+  private function isArrayElement ($line) {
+    if (!$line || !is_scalar($line)) return false;
+    if (substr($line, 0, 2) != '- ') return false;
+    if (strlen ($line) > 3)
+      if (substr($line,0,3) == '---') return false;
+
+    return true;
+  }
+
+  private function isHashElement ($line) {
+    return strpos($line, ':');
+  }
+
+  private function isLiteral ($line) {
+    if ($this->isArrayElement($line)) return false;
+    if ($this->isHashElement($line)) return false;
+    return true;
+  }
+
+
+  private static function unquote ($value) {
+    if (!$value) return $value;
+    if (!is_string($value)) return $value;
+    if ($value[0] == '\'') return trim ($value, '\'');
+    if ($value[0] == '"') return trim ($value, '"');
+    return $value;
+  }
+
+  private function startsMappedSequence ($line) {
+    return (substr($line, 0, 2) == '- ' && substr ($line, -1, 1) == ':');
+  }
+
+  private function returnMappedSequence ($line) {
+    $array = array();
+    $key         = self::unquote(trim(substr($line,1,-1)));
+    $array[$key] = array();
+    $this->delayedPath = array(strpos ($line, $key) + $this->indent => $key);
+    return array($array);
+  }
+
+  private function checkKeysInValue($value) {
+    if (strchr('[{"\'', $value[0]) === false) {
+      if (strchr($value, ': ') !== false) {
+          throw new Exception('Too many keys: '.$value);
+      }
+    }
+  }
+
+  private function returnMappedValue ($line) {
+    $this->checkKeysInValue($line);
+    $array = array();
+    $key         = self::unquote (trim(substr($line,0,-1)));
+    $array[$key] = '';
+    return $array;
+  }
+
+  private function startsMappedValue ($line) {
+    return (substr ($line, -1, 1) == ':');
+  }
+
+  private function isPlainArray ($line) {
+    return ($line[0] == '[' && substr ($line, -1, 1) == ']');
+  }
+
+  private function returnPlainArray ($line) {
+    return $this->_toType($line);
+  }
+
+  private function returnKeyValuePair ($line) {
+    $array = array();
+    $key = '';
+    if (strpos ($line, ': ')) {
+      // It's a key/value pair most likely
+      // If the key is in double quotes pull it out
+      if (($line[0] == '"' || $line[0] == "'") && preg_match('/^(["\'](.*)["\'](\s)*:)/',$line,$matches)) {
+        $value = trim(str_replace($matches[1],'',$line));
+        $key   = $matches[2];
+      } else {
+        // Do some guesswork as to the key and the value
+        $explode = explode(': ', $line);
+        $key     = trim(array_shift($explode));
+        $value   = trim(implode(': ', $explode));
+        $this->checkKeysInValue($value);
+      }
+      // Set the type of the value.  Int, string, etc
+      $value = $this->_toType($value);
+      if ($key === '0') $key = '__!YAMLZero';
+      $array[$key] = $value;
+    } else {
+      $array = array ($line);
+    }
+    return $array;
+
+  }
+
+
+  private function returnArrayElement ($line) {
+     if (strlen($line) <= 1) return array(array()); // Weird %)
+     $array = array();
+     $value   = trim(substr($line,1));
+     $value   = $this->_toType($value);
+     if ($this->isArrayElement($value)) {
+       $value = $this->returnArrayElement($value);
+     }
+     $array[] = $value;
+     return $array;
+  }
+
+
+  private function nodeContainsGroup ($line) {
+    $symbolsForReference = 'A-z0-9_\-';
+    if (strpos($line, '&') === false && strpos($line, '*') === false) return false; // Please die fast ;-)
+    if ($line[0] == '&' && preg_match('/^(&['.$symbolsForReference.']+)/', $line, $matches)) return $matches[1];
+    if ($line[0] == '*' && preg_match('/^(\*['.$symbolsForReference.']+)/', $line, $matches)) return $matches[1];
+    if (preg_match('/(&['.$symbolsForReference.']+)$/', $line, $matches)) return $matches[1];
+    if (preg_match('/(\*['.$symbolsForReference.']+$)/', $line, $matches)) return $matches[1];
+    if (preg_match ('#^\s*<<\s*:\s*(\*[^\s]+).*$#', $line, $matches)) return $matches[1];
+    return false;
+
+  }
+
+  private function addGroup ($line, $group) {
+    if ($group[0] == '&') $this->_containsGroupAnchor = substr ($group, 1);
+    if ($group[0] == '*') $this->_containsGroupAlias = substr ($group, 1);
+    //print_r ($this->path);
+  }
+
+  private function stripGroup ($line, $group) {
+    $line = trim(str_replace($group, '', $line));
+    return $line;
+  }
+}
+
+// Enable use of Spyc from command line
+// The syntax is the following: php Spyc.php spyc.yaml
+
+do {
+  if (PHP_SAPI != 'cli') break;
+  if (empty ($_SERVER['argc']) || $_SERVER['argc'] < 2) break;
+  if (empty ($_SERVER['PHP_SELF']) || FALSE === strpos ($_SERVER['PHP_SELF'], 'Spyc.php') ) break;
+  $file = $argv[1];
+  echo json_encode (spyc_load_file ($file));
+} while (0);
diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -353,6 +353,9 @@
     'PhutilXHPASTSyntaxHighlighter' => 'markup/syntax/highlighter/PhutilXHPASTSyntaxHighlighter.php',
     'PhutilXHPASTSyntaxHighlighterFuture' => 'markup/syntax/highlighter/xhpast/PhutilXHPASTSyntaxHighlighterFuture.php',
     'PhutilXHPASTSyntaxHighlighterTestCase' => 'markup/syntax/highlighter/__tests__/PhutilXHPASTSyntaxHighlighterTestCase.php',
+    'PhutilYAMLParser' => 'parser/PhutilYAMLParser.php',
+    'PhutilYAMLParserException' => 'parser/exception/PhutilYAMLParserException.php',
+    'PhutilYAMLParserTestCase' => 'parser/__tests__/PhutilYAMLParserTestCase.php',
     'QueryFuture' => 'future/query/QueryFuture.php',
     'TempFile' => 'filesystem/TempFile.php',
     'TestAbstractDirectedGraph' => 'utils/__tests__/TestAbstractDirectedGraph.php',
@@ -457,6 +460,7 @@
     'phutil_utf8v_codepoints' => 'utils/utf8.php',
     'phutil_utf8v_combined' => 'utils/utf8.php',
     'phutil_var_export' => 'utils/utils.php',
+    'phutil_yaml_decode' => 'utils/utils.php',
     'ppull' => 'utils/utils.php',
     'qsprintf' => 'xsprintf/qsprintf.php',
     'qsprintf_check_scalar_type' => 'xsprintf/qsprintf.php',
@@ -746,6 +750,8 @@
     'PhutilWordPressFuture' => 'FutureProxy',
     'PhutilXHPASTSyntaxHighlighterFuture' => 'FutureProxy',
     'PhutilXHPASTSyntaxHighlighterTestCase' => 'PhutilTestCase',
+    'PhutilYAMLParserException' => 'Exception',
+    'PhutilYAMLParserTestCase' => 'PhutilTestCase',
     'QueryFuture' => 'Future',
     'TestAbstractDirectedGraph' => 'AbstractDirectedGraph',
     'XHPASTNode' => 'AASTNode',
diff --git a/src/parser/PhutilYAMLParser.php b/src/parser/PhutilYAMLParser.php
new file mode 100644
--- /dev/null
+++ b/src/parser/PhutilYAMLParser.php
@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * A YAML parser.
+ *
+ * @phutil-external-symbol class Spyc
+ */
+final class PhutilYAMLParser {
+
+  public function parse($yaml) {
+    $root = phutil_get_library_root('phutil');
+    require_once $root.'/../externals/spyc/Spyc.php';
+
+    try {
+      return Spyc::YAMLLoadString($yaml);
+    } catch (Exception $ex) {
+      throw new PhutilYAMLParserException($ex->getMessage());
+    }
+  }
+
+}
diff --git a/src/parser/__tests__/PhutilYAMLParserTestCase.php b/src/parser/__tests__/PhutilYAMLParserTestCase.php
new file mode 100644
--- /dev/null
+++ b/src/parser/__tests__/PhutilYAMLParserTestCase.php
@@ -0,0 +1,408 @@
+<?php
+
+final class PhutilYAMLParserTestCase extends PhutilTestCase {
+
+  public function testValidYAML() {
+    $parser = new PhutilYAMLParser();
+
+    $tests = array(
+      // Mappings - with proper types
+      //'---' => null,
+      "String: Anyone's name, really." => array(
+        'String' => "Anyone's name, really.",
+      ),
+      'Int: 13' => array('Int' => 13),
+      'BadHex: f0xf3' => array('BadHex' => 'f0xf3'),
+      'Hex: 0xf3' => array('Hex' => 243),
+      'True: true' => array('True' => true),
+      'False: false' => array('False' => false),
+      'Zero: 0' => array('Zero' => 0),
+      'Null: NULL' => array('Null' => null),
+      "NotNull: 'null'" => array('NotNull' => 'null'),
+      "NotTrue: 'y'" => array('NotTrue' => 'y'),
+      "NotBoolTrue: 'true'" => array('NotBoolTrue' => 'true'),
+      "NotInt: '5'" => array('NotInt' => '5'),
+      'Float: 5.34' => array('Float' => 5.34),
+      'Negative: -90' => array('Negative' => -90),
+      'SmallFloat: 0.7' => array('SmallFloat' => 0.7),
+      'NewLine: \n' => array('NewLine' => '\n'),
+      'QuotedNewLine: "\n"' => array('QuotedNewLine' => "\n"),
+
+      // A sequence
+      "- PHP Class\n- Basic YAML Loader\n- Very Basic YAML Dumper" => array(
+        'PHP Class',
+        'Basic YAML Loader',
+        'Very Basic YAML Dumper',
+      ),
+
+      // A sequence of a sequence
+      "-\n  - YAML is so easy to learn.\n".
+      "  - Your config files will never be the same." => array(
+        array(
+          'YAML is so easy to learn.',
+          'Your config files will never be the same.',
+        ),
+      ),
+
+      // Sequence of mappings
+      "-\n  cpu: 1.5ghz\n  ram: 1 gig\n  os : os x 10.4.1" => array(
+        array(
+          'cpu' => '1.5ghz',
+          'ram' => '1 gig',
+          'os' => 'os x 10.4.1',
+        ),
+      ),
+
+      // Mapped sequence
+      "domains:\n  - yaml.org\n  - php.net" => array(
+        'domains'=> array(
+          'yaml.org',
+          'php.net',
+        ),
+      ),
+      "- program: Adium\n  platform: OS X\n  type: Chat Client" => array(
+        array(
+          'program' => 'Adium',
+          'platform' => 'OS X',
+          'type' => 'Chat Client',
+        ),
+      ),
+
+      // A folded block as a mapped value
+      "no time: >\n  There isn't any time\n  for your tricks!\n\n".
+      "  Do you understand?" => array(
+        'no time' =>
+          "There isn't any time for your tricks!\nDo you understand?",
+      ),
+
+      // A literal block as a mapped value
+      "some time: |\n  There is nothing but time\n  for your tricks." => array(
+        'some time' => "There is nothing but time\nfor your tricks.",
+      ),
+
+      // Crazy combinations
+      "databases:\n  - name: spartan\n    notes:\n".
+      "      - Needs to be backed up\n".
+      "      - Needs to be normalized\n".
+      "    type: mysql" => array(
+        'databases' => array(
+          array(
+            'name' => 'spartan',
+            'notes' => array(
+              'Needs to be backed up',
+              'Needs to be normalized',
+            ),
+            'type' => 'mysql',
+          ),
+        ),
+      ),
+
+      // You can be a bit tricky
+      '"if: you\'d": like' => array("if: you'd" => 'like'),
+
+      // Inline sequences
+      '- [One, Two, Three, Four]' => array(
+        array('One', 'Two', 'Three', 'Four'),
+      ),
+
+      // Nested Inline Sequences
+      '- [One, [Two, And, Three], Four, Five]' => array(
+        array(
+          'One',
+          array('Two', 'And', 'Three'),
+          'Four',
+          'Five',
+        ),
+      ),
+
+      // Nested Nested Inline Sequences
+      '- [This, [Is, Getting, [Ridiculous, Guys]], '.
+      'Seriously, [Show, Mercy]]' => array(
+        array(
+          'This',
+          array('Is', 'Getting', array('Ridiculous', 'Guys')),
+          'Seriously',
+          array('Show', 'Mercy'),
+        ),
+      ),
+
+      // Inline mappings
+      '- {name: chris, age: young, brand: lucky strike}' => array(
+        array(
+          'name' => 'chris',
+          'age' => 'young',
+          'brand' => 'lucky strike',
+        ),
+      ),
+
+      // Nested inline mappings
+      '- {name: mark, age: older than chris, '.
+      'brand: [marlboro, lucky strike]}' => array(
+        array(
+          'name' => 'mark',
+          'age' => 'older than chris',
+          'brand' => array('marlboro', 'lucky strike'),
+        ),
+      ),
+
+      // References -- they're shaky, but functional
+      "dynamic languages: &DLANGS\n  - Perl\n  - Python\n  - PHP\n  - Ruby\n".
+      "compiled languages: &CLANGS\n  - C/C++\n  - Java\n".
+      "all languages:\n  - *DLANGS\n  - *CLANGS" => array(
+        'dynamic languages' => array(
+          'Perl',
+          'Python',
+          'PHP',
+          'Ruby',
+        ),
+        'compiled languages' => array(
+          'C/C++',
+          'Java',
+        ),
+        'all languages' => array(
+          array(
+            'Perl',
+            'Python',
+            'PHP',
+            'Ruby',
+          ),
+          array(
+            'C/C++',
+            'Java',
+          ),
+        ),
+      ),
+
+      // Added in .2.2: Escaped quotes
+      "- you know, this shouldn't work.  but it does.\n".
+      "- 'that''s my value.'\n- 'again, that\'s my value.'\n".
+      '- "here\'s to \"quotes\", boss."' => array(
+        "you know, this shouldn't work.  but it does.",
+        "that's my value.",
+        "again, that's my value.",
+        'here\'s to "quotes", boss.',
+      ),
+
+      // Added in .2.3
+      '- {name: "Foo, Bar\'s", age: 20}' => array(
+        array(
+          'name' => "Foo, Bar's",
+          'age' => 20,
+        ),
+      ),
+
+      // Added in .2.4: bug [ 1418193 ] Quote Values in Nested Arrays
+      '- [a, [\'1\', "2"], b]' => array(
+        array(
+          'a',
+          array('1', '2'),
+          'b',
+        ),
+      ),
+
+      // Add in .5.2: Quoted new line values.
+      '- "First line\nSecond line\nThird line"' => array(
+        "First line\nSecond line\nThird line",
+      ),
+
+      // Added in .2.4: malformed YAML
+      "all\n  javascripts:     [dom1.js, dom.js]" => array(
+        array(
+          'javascripts' => array(
+            'dom1.js',
+            'dom.js',
+          ),
+        ),
+      ),
+
+      // Added in .2
+      '1040: Ooo, a numeric key! # And working comments? '.
+      'Wow! Colons in comments: a menace (0.3).' => array(
+        1040 => 'Ooo, a numeric key!',
+      ),
+
+      'hash_1: Hash #and a comment' => array(
+        'hash_1' => 'Hash',
+      ),
+      'hash_2: "Hash #and a comment"' => array(
+        'hash_2' => 'Hash #and a comment',
+      ),
+      '"hash#3": "Hash (#) can appear in key too"' => array(
+        'hash#3' => 'Hash (#) can appear in key too',
+      ),
+
+      //'float_test: 1.0' => array('float_test' => 1.0),
+      "float_test_with_quotes: '1.0'" => array(
+        'float_test_with_quotes' => '1.0',
+      ),
+      /*'float_inverse_test: 001' => array(
+        'float_inverse_test' => 1,
+      ),*/
+
+      //'a_really_large_number: 11579208923731619542357098500'.
+      /*'8687907853269984665640564039457584007913129639936 # 2^256' => array(
+        'a_really_large_number' => 115792089237316195423570985008687907853269984665640564039457584007913129639936,
+      ),*/
+
+      'int array: [ 1, 2, 3 ]' => array('int array' => array(1, 2, 3)),
+
+      "array on several lines:\n".
+      "  [ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9,\n".
+      "    10, 11, 12, 13, 14, 15, 16, 17, 18, 19 ]" => array(
+        'array on several lines' => array(
+          0,
+          1,
+          2,
+          3,
+          4,
+          5,
+          6,
+          7,
+          8,
+          9,
+          10,
+          11,
+          12,
+          13,
+          14,
+          15,
+          16,
+          17,
+          18,
+          19,
+        ),
+      ),
+
+      'morelesskey: "<value>"' => array('morelesskey' => '<value>'),
+
+      'array_of_zero: [0]' => array('array_of_zero' => array(0)),
+      'sophisticated_array_of_zero: {rx: {tx: [0]} }' => array(
+        'sophisticated_array_of_zero' => array(
+          'rx' => array('tx' => array(0)),
+        ),
+      ),
+
+      "switches:\n  - { row: 0, col: 0, func: {tx: [0, 1]} }" => array(
+        'switches' => array(
+          array(
+            'row' => 0,
+            'col' => 0,
+            'func' => array('tx' => array(0, 1)),
+          ),
+        ),
+      ),
+
+      'empty_sequence: [ ]' => array('empty_sequence' => array()),
+      'empty_hash: { }' => array('empty_hash' => array()),
+
+      'special_characters: "[{]]{{]]"' => array(
+        'special_characters' => '[{]]{{]]',
+      ),
+
+      'asterisks: "*"' => array('asterisks' => '*'),
+
+      "empty_key:\n  :\n    key: value" => array(
+        'empty_key' => array(
+          '' => array('key' => 'value'),
+        ),
+      ),
+
+      'trailing_colon: "foo:"' => array('trailing_colon' => 'foo:'),
+
+      "multiline_items:\n  - type: SomeItem\n".
+      "    values: [blah, blah, blah,\n      blah]\n".
+      "    ints: [2, 54, 12,\n      2143]" => array(
+        'multiline_items' => array(
+          array(
+            'type' => 'SomeItem',
+            'values' => array(
+              'blah',
+              'blah',
+              'blah',
+              'blah',
+            ),
+            'ints' => array(
+              2,
+              54,
+              12,
+              2143,
+            ),
+          ),
+        ),
+      ),
+
+      "many_lines: |\n  A quick\n  fox\n\n\n  jumped\n  ".
+      "over\n\n\n\n\n\n  a lazy\n\n\n\n  dog" => array(
+        'many_lines' => "A quick\nfox\n\n\njumped\nover\n\n\n\n\n\na lazy\n\n\n\ndog",
+      ),
+
+      "werte:\n  1: nummer 1\n  0: Stunde 0" => array(
+        'werte' => array(
+          1 => 'nummer 1',
+          0 => 'Stunde 0',
+        ),
+      ),
+
+      /*"noindent_records:\n- record1: value1\n- record2: value2" => array(
+        'noindent_records' => array(
+          'record1' => 'value1',
+          'record2' => 'value2',
+        ),
+      ),*/
+
+      '"a:1": [1000]' => array('a:1' => array(1000)),
+      "\"a:2\":\n  - 2000" => array('a:2' => array(2000)),
+      'a:3: [3000]' => array('a:3' => array(3000)),
+
+      "complex_unquoted_key:\n  a:b:''test': value" => array(
+        'complex_unquoted_key' => array(
+          "a:b:''test'" => 'value',
+        ),
+      ),
+
+      "array with commas:\n  [\"0\",\"1\"]" => array(
+        'array with commas' => array('0', '1'),
+      ),
+
+      'invoice: ["Something", "", \'\', "Something else"]' => array(
+        'invoice' => array('Something', '', '', 'Something else'),
+      ),
+      'quotes: [\'Something\', "Nothing", \'Anything\', "Thing"]' => array(
+        'quotes' => array('Something', 'Nothing', 'Anything', 'Thing'),
+      ),
+
+      // [Endloop]
+      "endloop: |\n  Does this line in the end indeed make ".
+      "Spyc go to an infinite loop?" => array(
+        'endloop' => 'Does this line in the end indeed make Spyc go to an infinite loop?',
+      ),
+    );
+
+    foreach ($tests as $input => $expect) {
+      $this->assertEqual(
+        $expect,
+        $parser->parse($input),
+        pht('Parsing YAML: %s', $input));
+    }
+  }
+
+  public function testInvalidYAML() {
+    $parser = new PhutilYAMLParser();
+
+    $tests = array(
+      //'',
+      //"key:\nvalue",
+    );
+
+    foreach ($tests as $input => $expected) {
+      $caught = null;
+      try {
+        $parser->parse($input);
+      } catch (Exception $ex) {
+        $caught = $ex;
+      }
+      $this->assertTrue($caught instanceof PhutilYAMLParserException);
+    }
+  }
+
+}
diff --git a/src/parser/exception/PhutilYAMLParserException.php b/src/parser/exception/PhutilYAMLParserException.php
new file mode 100644
--- /dev/null
+++ b/src/parser/exception/PhutilYAMLParserException.php
@@ -0,0 +1,3 @@
+<?php
+
+final class PhutilYAMLParserException extends Exception {}
diff --git a/src/utils/__tests__/PhutilUtilsTestCase.php b/src/utils/__tests__/PhutilUtilsTestCase.php
--- a/src/utils/__tests__/PhutilUtilsTestCase.php
+++ b/src/utils/__tests__/PhutilUtilsTestCase.php
@@ -593,6 +593,31 @@
     }
   }
 
+  public function testPhutilYAMLDecode() {
+    $valid_cases = array(
+      //
+    );
+
+    foreach ($valid_cases as $input => $expect) {
+      $result = phutil_yaml_decode($input);
+      $this->assertEqual($expect, $result, 'phutil_yaml_decode('.$input.')');
+    }
+
+    $invalid_cases = array(
+      //
+    );
+
+    foreach ($invalid_cases as $input) {
+      $caught = null;
+      try {
+        phutil_json_decode($input);
+      } catch (Exception $ex) {
+        $caught = $ex;
+      }
+      $this->assertTrue($caught instanceof PhutilYAMLParserException);
+    }
+  }
+
   public function testCensorCredentials() {
     $cases = array(
       '' => '',
diff --git a/src/utils/utils.php b/src/utils/utils.php
--- a/src/utils/utils.php
+++ b/src/utils/utils.php
@@ -1115,6 +1115,31 @@
 
 
 /**
+ * Decode a YAML dictionary.
+ *
+ * @param   string    A string which ostensibly contains a YAML-encoded list or
+ *                    dictionary.
+ * @return  mixed     Decoded list/dictionary.
+ */
+function phutil_yaml_decode($string) {
+  $result = false;
+
+  if (function_exists('yaml_parse')) {
+    $result = @yaml_parse($string);
+  }
+
+  if ($result === false) {
+    // Failed to decode the YAML. Try to use @{class:PhutilYAMLParser} instead.
+    // This will probably fail, but will throw a useful exception.
+    $parser = new PhutilYAMLParser();
+    $result = $parser->parse($string);
+  }
+
+  return $result;
+}
+
+
+/**
  * Attempt to censor any plaintext credentials from a string.
  *
  * The major use case here is to censor usernames and passwords from command