--- /dev/null
+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2017 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Psy\TabCompletion\Matcher;
+
+/**
+ * A PHP keyword tab completion Matcher.
+ *
+ * This matcher provides completion for all function-like PHP keywords.
+ *
+ * @author Marc Garcia <markcial@gmail.com>
+ */
+class KeywordsMatcher extends AbstractMatcher
+{
+ protected $keywords = array(
+ 'array', 'clone', 'declare', 'die', 'echo', 'empty', 'eval', 'exit', 'include',
+ 'include_once', 'isset', 'list', 'print', 'require', 'require_once', 'unset',
+ );
+
+ protected $mandatoryStartKeywords = array(
+ 'die', 'echo', 'print', 'unset',
+ );
+
+ /**
+ * Get all (completable) PHP keywords.
+ *
+ * @return array
+ */
+ public function getKeywords()
+ {
+ return $this->keywords;
+ }
+
+ /**
+ * Check whether $keyword is a (completable) PHP keyword.
+ *
+ * @param string $keyword
+ *
+ * @return bool
+ */
+ public function isKeyword($keyword)
+ {
+ return in_array($keyword, $this->keywords);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getMatches(array $tokens, array $info = array())
+ {
+ $input = $this->getInput($tokens);
+
+ return array_filter($this->keywords, function ($keyword) use ($input) {
+ return AbstractMatcher::startsWith($input, $keyword);
+ });
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function hasMatched(array $tokens)
+ {
+ $token = array_pop($tokens);
+ $prevToken = array_pop($tokens);
+
+ switch (true) {
+ case self::hasToken(array(self::T_OPEN_TAG, self::T_VARIABLE), $token):
+// case is_string($token) && $token === '$':
+ case self::hasToken(array(self::T_OPEN_TAG, self::T_VARIABLE), $prevToken) &&
+ self::tokenIs($token, self::T_STRING):
+ case self::isOperator($token):
+ return true;
+ }
+
+ return false;
+ }
+}