--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/Twig-1.3.0/lib/Twig/Lexer.php Tue Oct 25 23:56:28 2011 +0200
@@ -0,0 +1,328 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Lexes a template string.
+ *
+ * @package twig
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Lexer implements Twig_LexerInterface
+{
+ protected $tokens;
+ protected $code;
+ protected $cursor;
+ protected $lineno;
+ protected $end;
+ protected $state;
+ protected $brackets;
+
+ protected $env;
+ protected $filename;
+ protected $options;
+ protected $operatorRegex;
+
+ const STATE_DATA = 0;
+ const STATE_BLOCK = 1;
+ const STATE_VAR = 2;
+
+ const REGEX_NAME = '/[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*/A';
+ const REGEX_NUMBER = '/[0-9]+(?:\.[0-9]+)?/A';
+ const REGEX_STRING = '/"([^"\\\\]*(?:\\\\.[^"\\\\]*)*)"|\'([^\'\\\\]*(?:\\\\.[^\'\\\\]*)*)\'/As';
+ const PUNCTUATION = '()[]{}?:.,|';
+
+ public function __construct(Twig_Environment $env, array $options = array())
+ {
+ $this->env = $env;
+
+ $this->options = array_merge(array(
+ 'tag_comment' => array('{#', '#}'),
+ 'tag_block' => array('{%', '%}'),
+ 'tag_variable' => array('{{', '}}'),
+ 'whitespace_trim' => '-',
+ ), $options);
+ }
+
+ /**
+ * Tokenizes a source code.
+ *
+ * @param string $code The source code
+ * @param string $filename A unique identifier for the source code
+ *
+ * @return Twig_TokenStream A token stream instance
+ */
+ public function tokenize($code, $filename = null)
+ {
+ if (function_exists('mb_internal_encoding') && ((int) ini_get('mbstring.func_overload')) & 2) {
+ $mbEncoding = mb_internal_encoding();
+ mb_internal_encoding('ASCII');
+ }
+
+ $this->code = str_replace(array("\r\n", "\r"), "\n", $code);
+ $this->filename = $filename;
+ $this->cursor = 0;
+ $this->lineno = 1;
+ $this->end = strlen($this->code);
+ $this->tokens = array();
+ $this->state = self::STATE_DATA;
+ $this->brackets = array();
+
+ while ($this->cursor < $this->end) {
+ // dispatch to the lexing functions depending
+ // on the current state
+ switch ($this->state) {
+ case self::STATE_DATA:
+ $this->lexData();
+ break;
+
+ case self::STATE_BLOCK:
+ $this->lexBlock();
+ break;
+
+ case self::STATE_VAR:
+ $this->lexVar();
+ break;
+ }
+ }
+
+ $this->pushToken(Twig_Token::EOF_TYPE);
+
+ if (!empty($this->brackets)) {
+ list($expect, $lineno) = array_pop($this->brackets);
+ throw new Twig_Error_Syntax(sprintf('Unclosed "%s"', $expect), $lineno, $this->filename);
+ }
+
+ if (isset($mbEncoding)) {
+ mb_internal_encoding($mbEncoding);
+ }
+
+ return new Twig_TokenStream($this->tokens, $this->filename);
+ }
+
+ protected function lexData()
+ {
+ $pos = $this->end;
+ $append = '';
+
+ // Find the first token after the cursor
+ foreach (array('tag_comment', 'tag_variable', 'tag_block') as $type) {
+ $tmpPos = strpos($this->code, $this->options[$type][0], $this->cursor);
+ if (false !== $tmpPos && $tmpPos < $pos) {
+ $trimBlock = false;
+ $append = '';
+ $pos = $tmpPos;
+ $token = $this->options[$type][0];
+ if (strpos($this->code, $this->options['whitespace_trim'], $pos) === ($pos + strlen($token))) {
+ $trimBlock = true;
+ $append = $this->options['whitespace_trim'];
+ }
+ }
+ }
+
+ // if no matches are left we return the rest of the template as simple text token
+ if ($pos === $this->end) {
+ $this->pushToken(Twig_Token::TEXT_TYPE, substr($this->code, $this->cursor));
+ $this->cursor = $this->end;
+ return;
+ }
+
+ // push the template text first
+ $text = $textContent = substr($this->code, $this->cursor, $pos - $this->cursor);
+ if (true === $trimBlock) {
+ $text = rtrim($text);
+ }
+ $this->pushToken(Twig_Token::TEXT_TYPE, $text);
+ $this->moveCursor($textContent.$token.$append);
+
+ switch ($token) {
+ case $this->options['tag_comment'][0]:
+ $this->lexComment();
+ break;
+
+ case $this->options['tag_block'][0]:
+ // raw data?
+ if (preg_match('/\s*raw\s*'.preg_quote($this->options['tag_block'][1], '/').'/As', $this->code, $match, null, $this->cursor)) {
+ $this->moveCursor($match[0]);
+ $this->lexRawData();
+ $this->state = self::STATE_DATA;
+ // {% line \d+ %}
+ } else if (preg_match('/\s*line\s+(\d+)\s*'.preg_quote($this->options['tag_block'][1], '/').'/As', $this->code, $match, null, $this->cursor)) {
+ $this->moveCursor($match[0]);
+ $this->lineno = (int) $match[1];
+ $this->state = self::STATE_DATA;
+ } else {
+ $this->pushToken(Twig_Token::BLOCK_START_TYPE);
+ $this->state = self::STATE_BLOCK;
+ }
+ break;
+
+ case $this->options['tag_variable'][0]:
+ $this->pushToken(Twig_Token::VAR_START_TYPE);
+ $this->state = self::STATE_VAR;
+ break;
+ }
+ }
+
+ protected function lexBlock()
+ {
+ $trimTag = preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '/');
+ $endTag = preg_quote($this->options['tag_block'][1], '/');
+
+ if (empty($this->brackets) && preg_match('/\s*(?:'.$trimTag.'\s*|\s*'.$endTag.')\n?/A', $this->code, $match, null, $this->cursor)) {
+ $this->pushToken(Twig_Token::BLOCK_END_TYPE);
+ $this->moveCursor($match[0]);
+ $this->state = self::STATE_DATA;
+ } else {
+ $this->lexExpression();
+ }
+ }
+
+ protected function lexVar()
+ {
+ $trimTag = preg_quote($this->options['whitespace_trim'].$this->options['tag_variable'][1], '/');
+ $endTag = preg_quote($this->options['tag_variable'][1], '/');
+
+ if (empty($this->brackets) && preg_match('/\s*'.$trimTag.'\s*|\s*'.$endTag.'/A', $this->code, $match, null, $this->cursor)) {
+ $this->pushToken(Twig_Token::VAR_END_TYPE);
+ $this->moveCursor($match[0]);
+ $this->state = self::STATE_DATA;
+ } else {
+ $this->lexExpression();
+ }
+ }
+
+ protected function lexExpression()
+ {
+ // whitespace
+ if (preg_match('/\s+/A', $this->code, $match, null, $this->cursor)) {
+ $this->moveCursor($match[0]);
+
+ if ($this->cursor >= $this->end) {
+ throw new Twig_Error_Syntax(sprintf('Unexpected end of file: Unclosed "%s"', $this->state === self::STATE_BLOCK ? 'block' : 'variable'));
+ }
+ }
+
+ // operators
+ if (preg_match($this->getOperatorRegex(), $this->code, $match, null, $this->cursor)) {
+ $this->pushToken(Twig_Token::OPERATOR_TYPE, $match[0]);
+ $this->moveCursor($match[0]);
+ }
+ // names
+ elseif (preg_match(self::REGEX_NAME, $this->code, $match, null, $this->cursor)) {
+ $this->pushToken(Twig_Token::NAME_TYPE, $match[0]);
+ $this->moveCursor($match[0]);
+ }
+ // numbers
+ elseif (preg_match(self::REGEX_NUMBER, $this->code, $match, null, $this->cursor)) {
+ $this->pushToken(Twig_Token::NUMBER_TYPE, ctype_digit($match[0]) ? (int) $match[0] : (float) $match[0]);
+ $this->moveCursor($match[0]);
+ }
+ // punctuation
+ elseif (false !== strpos(self::PUNCTUATION, $this->code[$this->cursor])) {
+ // opening bracket
+ if (false !== strpos('([{', $this->code[$this->cursor])) {
+ $this->brackets[] = array($this->code[$this->cursor], $this->lineno);
+ }
+ // closing bracket
+ elseif (false !== strpos(')]}', $this->code[$this->cursor])) {
+ if (empty($this->brackets)) {
+ throw new Twig_Error_Syntax(sprintf('Unexpected "%s"', $this->code[$this->cursor]), $this->lineno, $this->filename);
+ }
+
+ list($expect, $lineno) = array_pop($this->brackets);
+ if ($this->code[$this->cursor] != strtr($expect, '([{', ')]}')) {
+ throw new Twig_Error_Syntax(sprintf('Unclosed "%s"', $expect), $lineno, $this->filename);
+ }
+ }
+
+ $this->pushToken(Twig_Token::PUNCTUATION_TYPE, $this->code[$this->cursor]);
+ ++$this->cursor;
+ }
+ // strings
+ elseif (preg_match(self::REGEX_STRING, $this->code, $match, null, $this->cursor)) {
+ $this->pushToken(Twig_Token::STRING_TYPE, stripcslashes(substr($match[0], 1, -1)));
+ $this->moveCursor($match[0]);
+ }
+ // unlexable
+ else {
+ throw new Twig_Error_Syntax(sprintf('Unexpected character "%s"', $this->code[$this->cursor]), $this->lineno, $this->filename);
+ }
+ }
+
+ protected function lexRawData()
+ {
+ if (!preg_match('/'.preg_quote($this->options['tag_block'][0], '/').'\s*endraw\s*'.preg_quote($this->options['tag_block'][1], '/').'/s', $this->code, $match, PREG_OFFSET_CAPTURE, $this->cursor)) {
+ throw new Twig_Error_Syntax(sprintf('Unexpected end of file: Unclosed "block"'));
+ }
+ $text = substr($this->code, $this->cursor, $match[0][1] - $this->cursor);
+ $this->pushToken(Twig_Token::TEXT_TYPE, $text);
+ $this->moveCursor($text.$match[0][0]);
+ }
+
+ protected function lexComment()
+ {
+ $commentEndRegex = '/(?:'.preg_quote($this->options['whitespace_trim'], '/')
+ .preg_quote($this->options['tag_comment'][1], '/').'\s*|'
+ .preg_quote($this->options['tag_comment'][1], '/').')\n?/s';
+
+ if (!preg_match($commentEndRegex, $this->code, $match, PREG_OFFSET_CAPTURE, $this->cursor)) {
+ throw new Twig_Error_Syntax('Unclosed comment', $this->lineno, $this->filename);
+ }
+
+ $this->moveCursor(substr($this->code, $this->cursor, $match[0][1] - $this->cursor).$match[0][0]);
+ }
+
+ protected function pushToken($type, $value = '')
+ {
+ // do not push empty text tokens
+ if (Twig_Token::TEXT_TYPE === $type && '' === $value) {
+ return;
+ }
+
+ $this->tokens[] = new Twig_Token($type, $value, $this->lineno);
+ }
+
+ protected function moveCursor($text)
+ {
+ $this->cursor += strlen($text);
+ $this->lineno += substr_count($text, "\n");
+ }
+
+ protected function getOperatorRegex()
+ {
+ if (null !== $this->operatorRegex) {
+ return $this->operatorRegex;
+ }
+
+ $operators = array_merge(
+ array('='),
+ array_keys($this->env->getUnaryOperators()),
+ array_keys($this->env->getBinaryOperators())
+ );
+
+ $operators = array_combine($operators, array_map('strlen', $operators));
+ arsort($operators);
+
+ $regex = array();
+ foreach ($operators as $operator => $length) {
+ // an operator that ends with a character must be followed by
+ // a whitespace or a parenthesis
+ if (ctype_alpha($operator[$length - 1])) {
+ $regex[] = preg_quote($operator, '/').'(?=[ ()])';
+ } else {
+ $regex[] = preg_quote($operator, '/');
+ }
+ }
+
+ return $this->operatorRegex = '/'.implode('|', $regex).'/A';
+ }
+}