Version 1

[yaffs-website] / vendor / symfony / expression-language / TokenStream.php

diff --git a/vendor/symfony/expression-language/TokenStream.php b/vendor/symfony/expression-language/TokenStream.php
new file mode 100644 (file)
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+++ b/vendor/symfony/expression-language/TokenStream.php
@@ -0,0 +1,99 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ExpressionLanguage;
+
+/**
+ * Represents a token stream.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class TokenStream
+{
+    public $current;
+
+    private $tokens;
+    private $position = 0;
+    private $expression;
+
+    /**
+     * Constructor.
+     *
+     * @param array  $tokens     An array of tokens
+     * @param string $expression
+     */
+    public function __construct(array $tokens, $expression = '')
+    {
+        $this->tokens = $tokens;
+        $this->current = $tokens[0];
+        $this->expression = $expression;
+    }
+
+    /**
+     * Returns a string representation of the token stream.
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        return implode("\n", $this->tokens);
+    }
+
+    /**
+     * Sets the pointer to the next token and returns the old one.
+     */
+    public function next()
+    {
+        if (!isset($this->tokens[$this->position])) {
+            throw new SyntaxError('Unexpected end of expression', $this->current->cursor, $this->expression);
+        }
+
+        ++$this->position;
+
+        $this->current = $this->tokens[$this->position];
+    }
+
+    /**
+     * Tests a token.
+     *
+     * @param array|int   $type    The type to test
+     * @param string|null $value   The token value
+     * @param string|null $message The syntax error message
+     */
+    public function expect($type, $value = null, $message = null)
+    {
+        $token = $this->current;
+        if (!$token->test($type, $value)) {
+            throw new SyntaxError(sprintf('%sUnexpected token "%s" of value "%s" ("%s" expected%s)', $message ? $message.'. ' : '', $token->type, $token->value, $type, $value ? sprintf(' with value "%s"', $value) : ''), $token->cursor, $this->expression);
+        }
+        $this->next();
+    }
+
+    /**
+     * Checks if end of stream was reached.
+     *
+     * @return bool
+     */
+    public function isEOF()
+    {
+        return $this->current->type === Token::EOF_TYPE;
+    }
+
+    /**
+     * @internal
+     *
+     * @return string
+     */
+    public function getExpression()
+    {
+        return $this->expression;
+    }
+}