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<?php
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/*
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* This file is part of Twig.
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*
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* (c) 2009 Fabien Potencier
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* (c) 2009 Armin Ronacher
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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/**
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* Lexes a template string.
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*
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* @package twig
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class Twig_Lexer implements Twig_LexerInterface
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{
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protected $tokens;
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protected $code;
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protected $cursor;
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protected $lineno;
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protected $end;
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protected $state;
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protected $states;
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protected $brackets;
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protected $env;
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protected $filename;
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protected $options;
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protected $regexes;
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protected $position;
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protected $positions;
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const STATE_DATA = 0;
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const STATE_BLOCK = 1;
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const STATE_VAR = 2;
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const STATE_STRING = 3;
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const STATE_INTERPOLATION = 4;
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const REGEX_NAME = '/[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*/A';
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const REGEX_NUMBER = '/[0-9]+(?:\.[0-9]+)?/A';
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const REGEX_STRING = '/"([^#"\\\\]*(?:\\\\.[^#"\\\\]*)*)"|\'([^\'\\\\]*(?:\\\\.[^\'\\\\]*)*)\'/As';
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const REGEX_DQ_STRING_DELIM = '/"/A';
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const REGEX_DQ_STRING_PART = '/[^#"\\\\]*(?:(?:\\\\.|#(?!\{))[^#"\\\\]*)*/As';
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const PUNCTUATION = '()[]{}?:.,|';
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public function __construct(Twig_Environment $env, array $options = array())
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{
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$this->env = $env;
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$this->options = array_merge(array(
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'tag_comment' => array('{#', '#}'),
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'tag_block' => array('{%', '%}'),
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'tag_variable' => array('{{', '}}'),
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'whitespace_trim' => '-',
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'interpolation' => array('#{', '}'),
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), $options);
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$this->regexes = array(
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'lex_var' => '/\s*'.preg_quote($this->options['whitespace_trim'].$this->options['tag_variable'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_variable'][1], '/').'/A',
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'lex_block' => '/\s*(?:'.preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_block'][1], '/').')\n?/A',
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'lex_raw_data' => '/('.preg_quote($this->options['tag_block'][0].$this->options['whitespace_trim'], '/').'|'.preg_quote($this->options['tag_block'][0], '/').')\s*endraw\s*(?:'.preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_block'][1], '/').')/s',
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'operator' => $this->getOperatorRegex(),
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'lex_comment' => '/(?:'.preg_quote($this->options['whitespace_trim'], '/').preg_quote($this->options['tag_comment'][1], '/').'\s*|'.preg_quote($this->options['tag_comment'][1], '/').')\n?/s',
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'lex_block_raw' => '/\s*raw\s*(?:'.preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_block'][1], '/').')/As',
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'lex_block_line' => '/\s*line\s+(\d+)\s*'.preg_quote($this->options['tag_block'][1], '/').'/As',
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'lex_tokens_start' => '/('.preg_quote($this->options['tag_variable'][0], '/').'|'.preg_quote($this->options['tag_block'][0], '/').'|'.preg_quote($this->options['tag_comment'][0], '/').')('.preg_quote($this->options['whitespace_trim'], '/').')?/s',
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'interpolation_start' => '/'.preg_quote($this->options['interpolation'][0], '/').'\s*/A',
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'interpolation_end' => '/\s*'.preg_quote($this->options['interpolation'][1], '/').'/A',
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);
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}
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/**
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* Tokenizes a source code.
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*
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* @param string $code The source code
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* @param string $filename A unique identifier for the source code
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*
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* @return Twig_TokenStream A token stream instance
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*/
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public function tokenize($code, $filename = null)
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{
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if (function_exists('mb_internal_encoding') && ((int) ini_get('mbstring.func_overload')) & 2) {
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$mbEncoding = mb_internal_encoding();
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mb_internal_encoding('ASCII');
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}
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$this->code = str_replace(array("\r\n", "\r"), "\n", $code);
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$this->filename = $filename;
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$this->cursor = 0;
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$this->lineno = 1;
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$this->end = strlen($this->code);
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$this->tokens = array();
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$this->state = self::STATE_DATA;
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$this->states = array();
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$this->brackets = array();
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$this->position = -1;
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// find all token starts in one go
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preg_match_all($this->regexes['lex_tokens_start'], $this->code, $matches, PREG_OFFSET_CAPTURE);
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$this->positions = $matches;
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while ($this->cursor < $this->end) {
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// dispatch to the lexing functions depending
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// on the current state
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switch ($this->state) {
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case self::STATE_DATA:
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$this->lexData();
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break;
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case self::STATE_BLOCK:
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$this->lexBlock();
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break;
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case self::STATE_VAR:
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$this->lexVar();
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break;
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case self::STATE_STRING:
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$this->lexString();
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break;
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case self::STATE_INTERPOLATION:
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$this->lexInterpolation();
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break;
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}
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}
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$this->pushToken(Twig_Token::EOF_TYPE);
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if (!empty($this->brackets)) {
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list($expect, $lineno) = array_pop($this->brackets);
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throw new Twig_Error_Syntax(sprintf('Unclosed "%s"', $expect), $lineno, $this->filename);
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}
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if (isset($mbEncoding)) {
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mb_internal_encoding($mbEncoding);
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}
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return new Twig_TokenStream($this->tokens, $this->filename);
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}
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protected function lexData()
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{
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// if no matches are left we return the rest of the template as simple text token
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if ($this->position == count($this->positions[0]) - 1) {
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$this->pushToken(Twig_Token::TEXT_TYPE, substr($this->code, $this->cursor));
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$this->cursor = $this->end;
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return;
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}
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// Find the first token after the current cursor
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$position = $this->positions[0][++$this->position];
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while ($position[1] < $this->cursor) {
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if ($this->position == count($this->positions[0]) - 1) {
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return;
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}
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$position = $this->positions[0][++$this->position];
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}
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// push the template text first
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$text = $textContent = substr($this->code, $this->cursor, $position[1] - $this->cursor);
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if (isset($this->positions[2][$this->position][0])) {
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$text = rtrim($text);
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}
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$this->pushToken(Twig_Token::TEXT_TYPE, $text);
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$this->moveCursor($textContent.$position[0]);
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switch ($this->positions[1][$this->position][0]) {
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case $this->options['tag_comment'][0]:
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$this->lexComment();
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break;
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case $this->options['tag_block'][0]:
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// raw data?
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if (preg_match($this->regexes['lex_block_raw'], $this->code, $match, null, $this->cursor)) {
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$this->moveCursor($match[0]);
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$this->lexRawData();
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// {% line \d+ %}
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} elseif (preg_match($this->regexes['lex_block_line'], $this->code, $match, null, $this->cursor)) {
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$this->moveCursor($match[0]);
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$this->lineno = (int) $match[1];
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} else {
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$this->pushToken(Twig_Token::BLOCK_START_TYPE);
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$this->pushState(self::STATE_BLOCK);
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}
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break;
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case $this->options['tag_variable'][0]:
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$this->pushToken(Twig_Token::VAR_START_TYPE);
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$this->pushState(self::STATE_VAR);
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break;
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}
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}
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protected function lexBlock()
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{
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if (empty($this->brackets) && preg_match($this->regexes['lex_block'], $this->code, $match, null, $this->cursor)) {
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$this->pushToken(Twig_Token::BLOCK_END_TYPE);
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$this->moveCursor($match[0]);
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$this->popState();
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} else {
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$this->lexExpression();
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}
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}
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protected function lexVar()
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{
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if (empty($this->brackets) && preg_match($this->regexes['lex_var'], $this->code, $match, null, $this->cursor)) {
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$this->pushToken(Twig_Token::VAR_END_TYPE);
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$this->moveCursor($match[0]);
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$this->popState();
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} else {
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$this->lexExpression();
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}
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}
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protected function lexExpression()
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{
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// whitespace
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if (preg_match('/\s+/A', $this->code, $match, null, $this->cursor)) {
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$this->moveCursor($match[0]);
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if ($this->cursor >= $this->end) {
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throw new Twig_Error_Syntax(sprintf('Unexpected end of file: Unclosed "%s"', $this->state === self::STATE_BLOCK ? 'block' : 'variable'), $this->lineno, $this->filename);
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}
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}
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// operators
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if (preg_match($this->regexes['operator'], $this->code, $match, null, $this->cursor)) {
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$this->pushToken(Twig_Token::OPERATOR_TYPE, $match[0]);
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$this->moveCursor($match[0]);
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}
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// names
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elseif (preg_match(self::REGEX_NAME, $this->code, $match, null, $this->cursor)) {
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$this->pushToken(Twig_Token::NAME_TYPE, $match[0]);
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$this->moveCursor($match[0]);
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}
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// numbers
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elseif (preg_match(self::REGEX_NUMBER, $this->code, $match, null, $this->cursor)) {
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$number = (float) $match[0]; // floats
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if (ctype_digit($match[0]) && $number <= PHP_INT_MAX) {
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$number = (int) $match[0]; // integers lower than the maximum
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}
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$this->pushToken(Twig_Token::NUMBER_TYPE, $number);
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$this->moveCursor($match[0]);
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}
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// punctuation
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elseif (false !== strpos(self::PUNCTUATION, $this->code[$this->cursor])) {
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// opening bracket
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if (false !== strpos('([{', $this->code[$this->cursor])) {
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$this->brackets[] = array($this->code[$this->cursor], $this->lineno);
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}
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// closing bracket
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elseif (false !== strpos(')]}', $this->code[$this->cursor])) {
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if (empty($this->brackets)) {
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throw new Twig_Error_Syntax(sprintf('Unexpected "%s"', $this->code[$this->cursor]), $this->lineno, $this->filename);
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}
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list($expect, $lineno) = array_pop($this->brackets);
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if ($this->code[$this->cursor] != strtr($expect, '([{', ')]}')) {
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throw new Twig_Error_Syntax(sprintf('Unclosed "%s"', $expect), $lineno, $this->filename);
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}
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}
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$this->pushToken(Twig_Token::PUNCTUATION_TYPE, $this->code[$this->cursor]);
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++$this->cursor;
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}
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// strings
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elseif (preg_match(self::REGEX_STRING, $this->code, $match, null, $this->cursor)) {
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$this->pushToken(Twig_Token::STRING_TYPE, stripcslashes(substr($match[0], 1, -1)));
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$this->moveCursor($match[0]);
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}
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// opening double quoted string
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elseif (preg_match(self::REGEX_DQ_STRING_DELIM, $this->code, $match, null, $this->cursor)) {
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$this->brackets[] = array('"', $this->lineno);
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280
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$this->pushState(self::STATE_STRING);
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$this->moveCursor($match[0]);
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}
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// unlexable
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else {
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throw new Twig_Error_Syntax(sprintf('Unexpected character "%s"', $this->code[$this->cursor]), $this->lineno, $this->filename);
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}
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287
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}
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288
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289
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protected function lexRawData()
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{
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291
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if (!preg_match($this->regexes['lex_raw_data'], $this->code, $match, PREG_OFFSET_CAPTURE, $this->cursor)) {
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292
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throw new Twig_Error_Syntax(sprintf('Unexpected end of file: Unclosed "block"'), $this->lineno, $this->filename);
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293
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}
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294
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295
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$text = substr($this->code, $this->cursor, $match[0][1] - $this->cursor);
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296
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$this->moveCursor($text.$match[0][0]);
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297
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298
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if (false !== strpos($match[1][0], $this->options['whitespace_trim'])) {
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$text = rtrim($text);
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300
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}
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301
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302
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$this->pushToken(Twig_Token::TEXT_TYPE, $text);
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303
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}
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304
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305
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protected function lexComment()
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306
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{
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307
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if (!preg_match($this->regexes['lex_comment'], $this->code, $match, PREG_OFFSET_CAPTURE, $this->cursor)) {
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throw new Twig_Error_Syntax('Unclosed comment', $this->lineno, $this->filename);
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}
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310
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311
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$this->moveCursor(substr($this->code, $this->cursor, $match[0][1] - $this->cursor).$match[0][0]);
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312
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}
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313
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314
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protected function lexString()
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315
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{
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316
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if (preg_match($this->regexes['interpolation_start'], $this->code, $match, null, $this->cursor)) {
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$this->brackets[] = array($this->options['interpolation'][0], $this->lineno);
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$this->pushToken(Twig_Token::INTERPOLATION_START_TYPE);
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$this->moveCursor($match[0]);
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$this->pushState(self::STATE_INTERPOLATION);
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321
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322
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} elseif (preg_match(self::REGEX_DQ_STRING_PART, $this->code, $match, null, $this->cursor) && strlen($match[0]) > 0) {
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$this->pushToken(Twig_Token::STRING_TYPE, stripcslashes($match[0]));
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$this->moveCursor($match[0]);
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} elseif (preg_match(self::REGEX_DQ_STRING_DELIM, $this->code, $match, null, $this->cursor)) {
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327
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list($expect, $lineno) = array_pop($this->brackets);
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329
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if ($this->code[$this->cursor] != '"') {
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330
|
throw new Twig_Error_Syntax(sprintf('Unclosed "%s"', $expect), $lineno, $this->filename);
|
|
331
|
}
|
|
332
|
|
|
333
|
$this->popState();
|
|
334
|
++$this->cursor;
|
|
335
|
}
|
|
336
|
}
|
|
337
|
|
|
338
|
protected function lexInterpolation()
|
|
339
|
{
|
|
340
|
$bracket = end($this->brackets);
|
|
341
|
if ($this->options['interpolation'][0] === $bracket[0] && preg_match($this->regexes['interpolation_end'], $this->code, $match, null, $this->cursor)) {
|
|
342
|
array_pop($this->brackets);
|
|
343
|
$this->pushToken(Twig_Token::INTERPOLATION_END_TYPE);
|
|
344
|
$this->moveCursor($match[0]);
|
|
345
|
$this->popState();
|
|
346
|
} else {
|
|
347
|
$this->lexExpression();
|
|
348
|
}
|
|
349
|
}
|
|
350
|
|
|
351
|
protected function pushToken($type, $value = '')
|
|
352
|
{
|
|
353
|
// do not push empty text tokens
|
|
354
|
if (Twig_Token::TEXT_TYPE === $type && '' === $value) {
|
|
355
|
return;
|
|
356
|
}
|
|
357
|
|
|
358
|
$this->tokens[] = new Twig_Token($type, $value, $this->lineno);
|
|
359
|
}
|
|
360
|
|
|
361
|
protected function moveCursor($text)
|
|
362
|
{
|
|
363
|
$this->cursor += strlen($text);
|
|
364
|
$this->lineno += substr_count($text, "\n");
|
|
365
|
}
|
|
366
|
|
|
367
|
protected function getOperatorRegex()
|
|
368
|
{
|
|
369
|
$operators = array_merge(
|
|
370
|
array('='),
|
|
371
|
array_keys($this->env->getUnaryOperators()),
|
|
372
|
array_keys($this->env->getBinaryOperators())
|
|
373
|
);
|
|
374
|
|
|
375
|
$operators = array_combine($operators, array_map('strlen', $operators));
|
|
376
|
arsort($operators);
|
|
377
|
|
|
378
|
$regex = array();
|
|
379
|
foreach ($operators as $operator => $length) {
|
|
380
|
// an operator that ends with a character must be followed by
|
|
381
|
// a whitespace or a parenthesis
|
|
382
|
if (ctype_alpha($operator[$length - 1])) {
|
|
383
|
$regex[] = preg_quote($operator, '/').'(?=[\s()])';
|
|
384
|
} else {
|
|
385
|
$regex[] = preg_quote($operator, '/');
|
|
386
|
}
|
|
387
|
}
|
|
388
|
|
|
389
|
return '/'.implode('|', $regex).'/A';
|
|
390
|
}
|
|
391
|
|
|
392
|
protected function pushState($state)
|
|
393
|
{
|
|
394
|
$this->states[] = $this->state;
|
|
395
|
$this->state = $state;
|
|
396
|
}
|
|
397
|
|
|
398
|
protected function popState()
|
|
399
|
{
|
|
400
|
if (0 === count($this->states)) {
|
|
401
|
throw new Exception('Cannot pop state without a previous state');
|
|
402
|
}
|
|
403
|
|
|
404
|
$this->state = array_pop($this->states);
|
|
405
|
}
|
|
406
|
}
|