eval() is evil

1 files changed, 103 insertions, 0 deletions

diff --git a/vendor/symfony/expression-language/Lexer.php b/vendor/symfony/expression-language/Lexer.php
new file mode 100644
index 0000000000..aeeda8a856
--- /dev/null
+++ b/vendor/symfony/expression-language/Lexer.php
@@ -0,0 +1,103 @@
+<?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;
+
+/**
+ * Lexes an expression.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Lexer
+{
+    /**
+     * Tokenizes an expression.
+     *
+     * @param string $expression The expression to tokenize
+     *
+     * @return TokenStream A token stream instance
+     *
+     * @throws SyntaxError
+     */
+    public function tokenize($expression)
+    {
+        $expression = str_replace(array("\r", "\n", "\t", "\v", "\f"), ' ', $expression);
+        $cursor = 0;
+        $tokens = array();
+        $brackets = array();
+        $end = strlen($expression);
+
+        while ($cursor < $end) {
+            if (' ' == $expression[$cursor]) {
+                ++$cursor;
+
+                continue;
+            }
+
+            if (preg_match('/[0-9]+(?:\.[0-9]+)?/A', $expression, $match, 0, $cursor)) {
+                // numbers
+                $number = (float) $match[0];  // floats
+                if (preg_match('/^[0-9]+$/', $match[0]) && $number <= PHP_INT_MAX) {
+                    $number = (int) $match[0]; // integers lower than the maximum
+                }
+                $tokens[] = new Token(Token::NUMBER_TYPE, $number, $cursor + 1);
+                $cursor += strlen($match[0]);
+            } elseif (false !== strpos('([{', $expression[$cursor])) {
+                // opening bracket
+                $brackets[] = array($expression[$cursor], $cursor);
+
+                $tokens[] = new Token(Token::PUNCTUATION_TYPE, $expression[$cursor], $cursor + 1);
+                ++$cursor;
+            } elseif (false !== strpos(')]}', $expression[$cursor])) {
+                // closing bracket
+                if (empty($brackets)) {
+                    throw new SyntaxError(sprintf('Unexpected "%s"', $expression[$cursor]), $cursor, $expression);
+                }
+
+                list($expect, $cur) = array_pop($brackets);
+                if ($expression[$cursor] != strtr($expect, '([{', ')]}')) {
+                    throw new SyntaxError(sprintf('Unclosed "%s"', $expect), $cur, $expression);
+                }
+
+                $tokens[] = new Token(Token::PUNCTUATION_TYPE, $expression[$cursor], $cursor + 1);
+                ++$cursor;
+            } elseif (preg_match('/"([^"\\\\]*(?:\\\\.[^"\\\\]*)*)"|\'([^\'\\\\]*(?:\\\\.[^\'\\\\]*)*)\'/As', $expression, $match, 0, $cursor)) {
+                // strings
+                $tokens[] = new Token(Token::STRING_TYPE, stripcslashes(substr($match[0], 1, -1)), $cursor + 1);
+                $cursor += strlen($match[0]);
+            } elseif (preg_match('/not in(?=[\s(])|\!\=\=|not(?=[\s(])|and(?=[\s(])|\=\=\=|\>\=|or(?=[\s(])|\<\=|\*\*|\.\.|in(?=[\s(])|&&|\|\||matches|\=\=|\!\=|\*|~|%|\/|\>|\||\!|\^|&|\+|\<|\-/A', $expression, $match, 0, $cursor)) {
+                // operators
+                $tokens[] = new Token(Token::OPERATOR_TYPE, $match[0], $cursor + 1);
+                $cursor += strlen($match[0]);
+            } elseif (false !== strpos('.,?:', $expression[$cursor])) {
+                // punctuation
+                $tokens[] = new Token(Token::PUNCTUATION_TYPE, $expression[$cursor], $cursor + 1);
+                ++$cursor;
+            } elseif (preg_match('/[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*/A', $expression, $match, 0, $cursor)) {
+                // names
+                $tokens[] = new Token(Token::NAME_TYPE, $match[0], $cursor + 1);
+                $cursor += strlen($match[0]);
+            } else {
+                // unlexable
+                throw new SyntaxError(sprintf('Unexpected character "%s"', $expression[$cursor]), $cursor, $expression);
+            }
+        }
+
+        $tokens[] = new Token(Token::EOF_TYPE, null, $cursor + 1);
+
+        if (!empty($brackets)) {
+            list($expect, $cur) = array_pop($brackets);
+            throw new SyntaxError(sprintf('Unclosed "%s"', $expect), $cur, $expression);
+        }
+
+        return new TokenStream($tokens, $expression);
+    }
+}