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<?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(["\r", "\n", "\t", "\v", "\f"], ' ', $expression); $cursor = 0; $tokens = []; $brackets = []; $end = \strlen($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 $brackets[] = [$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); } }
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