--- /dev/null
+<?php
+namespace Drush\SiteAlias;
+
+/**
+ * Parse a string that contains a site alias name, and provide convenience
+ * methods to access the parts.
+ *
+ * When provided by users, aliases must be in one of the following forms:
+ *
+ * - @sitename.env: List only sitename and environment.
+ *
+ * - @env: Look up a named environment in instances where the site root
+ * is known (e.g. via cwd). In this form, there is an implicit sitename
+ * 'self' which is replaced by the actual site alias name once known.
+ *
+ * - @sitename: Provides only the sitename; uses the 'default' environment,
+ * or 'dev' if there is no 'default' (or whatever is there if there is
+ * only one). With this form, the site alias name has no environment
+ * until the appropriate default environment is looked up. This form
+ * is checked only after `@env` returns no matches.
+ *
+ * There are also two special aliases that are recognized:
+ *
+ * - @self: The current bootstrapped site.
+ *
+ * - @none: No alias ('root' and 'uri' unset).
+ *
+ * The special alias forms have no environment component.
+ *
+ * When provided to an API, the '@' is optional.
+ *
+ * Note that @sitename and @env are ambiguous. Aliases in this form
+ * (that are not one of the special aliases) will first be assumed
+ * to be @env, and may be converted to @sitename later.
+ *
+ * Note that:
+ *
+ * - 'sitename' and 'env' MUST NOT contain a '.' (unlike previous
+ * versions of Drush).
+ * - Users SHOULD NOT create any environments that have the same name
+ * as any site name (and visa-versa).
+ * - All environments in one site record SHOULD be different versions
+ * of the same site (e.g. dev / test / live).
+ */
+class SiteAliasName
+{
+ protected $sitename;
+ protected $env;
+
+ /**
+ * Match the parts of a regex name.
+ */
+ const ALIAS_NAME_REGEX = '%^@?([a-zA-Z0-9_-]+)(\.[a-zA-Z0-9_-]+)?$%';
+
+ /**
+ * Create a new site alias name
+ *
+ * @param string $item
+ * @return SiteAliasName
+ */
+ public static function parse($item)
+ {
+ $aliasName = new self();
+ $aliasName->doParse($item);
+ return $aliasName;
+ }
+
+ /**
+ * Creae a SiteAliasName object from an alias name string.
+ *
+ * @param string $sitename The alias name for the site.
+ * @param string $env The name for the site's environment.
+ */
+ public function __construct($sitename = null, $env = null)
+ {
+ $this->sitename = $sitename;
+ $this->env = $env;
+ }
+
+ /**
+ * Convert an alias name back to a string.
+ *
+ * @return string
+ */
+ public function __toString()
+ {
+ $parts = [ $this->sitename() ];
+ if ($this->hasEnv()) {
+ $parts[] = $this->env();
+ }
+ return '@' . implode('.', $parts);
+ }
+
+ /**
+ * Determine whether or not the provided name is an alias name.
+ *
+ * @param string $aliasName
+ * @return bool
+ */
+ public static function isAliasName($aliasName)
+ {
+ // Alias names provided by users must begin with '@'
+ if (empty($aliasName) || ($aliasName[0] != '@')) {
+ return false;
+ }
+ return preg_match(self::ALIAS_NAME_REGEX, $aliasName);
+ }
+
+ /**
+ * Return the sitename portion of the alias name. By definition,
+ * every alias must have a sitename. If the site name is implicit,
+ * then 'self' is assumed.
+ *
+ * @return string
+ */
+ public function sitename()
+ {
+ return empty($this->sitename) ? 'self' : $this->sitename;
+ }
+
+ /**
+ * Set the sitename portion of the alias name
+ *
+ * @param string $sitename
+ */
+ public function setSitename($sitename)
+ {
+ $this->sitename = $sitename;
+ }
+
+ /**
+ * In general, all aliases have a sitename. The time when one will not
+ * is when an environment name `@env` is used as a shortcut for `@self.env`
+ *
+ * @return bool
+ */
+ public function hasSitename()
+ {
+ return !empty($this->sitename);
+ }
+
+ /**
+ * Return true if this alias name contains an 'env' portion.
+ *
+ * @return bool
+ */
+ public function hasEnv()
+ {
+ return !empty($this->env);
+ }
+
+ /**
+ * Set the environment portion of the alias record.
+ *
+ * @param string
+ */
+ public function setEnv($env)
+ {
+ $this->env = $env;
+ }
+
+ /**
+ * Return the 'env' portion of the alias record.
+ *
+ * @return string
+ */
+ public function env()
+ {
+ return $this->env;
+ }
+
+ /**
+ * Return true if this alias name is the 'self' alias.
+ *
+ * @return bool
+ */
+ public function isSelf()
+ {
+ return ($this->sitename == 'self') && !isset($this->env);
+ }
+
+ /**
+ * Return true if this alias name is the 'none' alias.
+ */
+ public function isNone()
+ {
+ return ($this->sitename == 'none') && !isset($this->env);
+ }
+
+ /**
+ * Convert the parts of an alias name to its various component parts.
+ *
+ * @param string $aliasName a string representation of an alias name.
+ */
+ protected function doParse($aliasName)
+ {
+ // Example contents of $matches:
+ //
+ // - a.b:
+ // [
+ // 0 => 'a.b',
+ // 1 => 'a',
+ // 2 => '.b',
+ // ]
+ //
+ // - a:
+ // [
+ // 0 => 'a',
+ // 1 => 'a',
+ // ]
+ if (!preg_match(self::ALIAS_NAME_REGEX, $aliasName, $matches)) {
+ return false;
+ }
+
+ // If $matches contains only two items, then assume the alias name
+ // contains only the environment.
+ if (count($matches) == 2) {
+ return $this->processSingleItem($matches[1]);
+ }
+
+ $this->sitename = $matches[1];
+ $this->env = ltrim($matches[2], '.');
+ return true;
+ }
+
+ /**
+ * Process an alias name provided as '@sitename'.
+ *
+ * @param string $sitename
+ * @return true
+ */
+ protected function processSingleItem($item)
+ {
+ if ($this->isSpecialAliasName($item)) {
+ $this->setSitename($item);
+ return true;
+ }
+ $this->sitename = '';
+ $this->env = $item;
+ return true;
+ }
+
+ /**
+ * Determine whether the requested name is a special alias name.
+ *
+ * @param string $item
+ * @return boolean
+ */
+ protected function isSpecialAliasName($item)
+ {
+ return ($item == 'self') || ($item == 'none');
+ }
+}
projects / yaffs-website / blobdiff