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- <?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 $states;
- protected $brackets;
- protected $env;
- protected $filename;
- protected $options;
- protected $regexes;
-
- const STATE_DATA = 0;
- const STATE_BLOCK = 1;
- const STATE_VAR = 2;
- const STATE_STRING = 3;
- const STATE_INTERPOLATION = 4;
-
- 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 REGEX_DQ_STRING_DELIM = '/"/A';
- const REGEX_DQ_STRING_PART = '/[^#"\\\\]*(?:(?:\\\\.|#(?!\{))[^#"\\\\]*)*/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' => '-',
- 'interpolation' => array('#{', '}'),
- ), $options);
-
- $this->regexes = array(
- 'lex_var' => '/\s*'.preg_quote($this->options['whitespace_trim'].$this->options['tag_variable'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_variable'][1], '/').'/A',
- 'lex_block' => '/\s*(?:'.preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_block'][1], '/').')\n?/A',
- 'lex_raw_data' => '/('.preg_quote($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',
- 'operator' => $this->getOperatorRegex(),
- 'lex_comment' => '/(?:'.preg_quote($this->options['whitespace_trim'], '/').preg_quote($this->options['tag_comment'][1], '/').'\s*|'.preg_quote($this->options['tag_comment'][1], '/').')\n?/s',
- 'lex_block_raw' => '/\s*raw\s*(?:'.preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_block'][1], '/').')/As',
- 'lex_block_line' => '/\s*line\s+(\d+)\s*'.preg_quote($this->options['tag_block'][1], '/').'/As',
- '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',
- 'interpolation_start' => '/'.preg_quote($this->options['interpolation'][0], '/').'\s*/A',
- 'interpolation_end' => '/\s*'.preg_quote($this->options['interpolation'][1], '/').'/A',
- );
- }
-
- /**
- * 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->states = array();
- $this->brackets = array();
- $this->position = -1;
-
- // find all token starts in one go
- preg_match_all($this->regexes['lex_tokens_start'], $this->code, $matches, PREG_OFFSET_CAPTURE);
- $this->positions = $matches;
-
- while ($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;
-
- case self::STATE_STRING:
- $this->lexString();
- break;
-
- case self::STATE_INTERPOLATION:
- $this->lexInterpolation();
- 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, $this->filename);
- }
-
- protected function lexData()
- {
- // if no matches are left we return the rest of the template as simple text token
- if ($this->position == count($this->positions[0]) - 1) {
- $this->pushToken(Twig_Token::TEXT_TYPE, substr($this->code, $this->cursor));
- $this->cursor = $this->end;
- return;
- }
-
- // Find the first token after the current cursor
- $position = $this->positions[0][++$this->position];
- while ($position[1] < $this->cursor) {
- if ($this->position == count($this->positions[0]) - 1) {
- return;
- }
- $position = $this->positions[0][++$this->position];
- }
-
- // push the template text first
- $text = $textContent = substr($this->code, $this->cursor, $position[1] - $this->cursor);
- if (isset($this->positions[2][$this->position][0])) {
- $text = rtrim($text);
- }
- $this->pushToken(Twig_Token::TEXT_TYPE, $text);
- $this->moveCursor($textContent.$position[0]);
-
- switch ($this->positions[1][$this->position][0]) {
- case $this->options['tag_comment'][0]:
- $this->lexComment();
- break;
-
- case $this->options['tag_block'][0]:
- // raw data?
- if (preg_match($this->regexes['lex_block_raw'], $this->code, $match, null, $this->cursor)) {
- $this->moveCursor($match[0]);
- $this->lexRawData();
- // {% line \d+ %}
- } else if (preg_match($this->regexes['lex_block_line'], $this->code, $match, null, $this->cursor)) {
- $this->moveCursor($match[0]);
- $this->lineno = (int) $match[1];
- } else {
- $this->pushToken(Twig_Token::BLOCK_START_TYPE);
- $this->pushState(self::STATE_BLOCK);
- }
- break;
-
- case $this->options['tag_variable'][0]:
- $this->pushToken(Twig_Token::VAR_START_TYPE);
- $this->pushState(self::STATE_VAR);
- break;
- }
- }
-
- protected function lexBlock()
- {
- if (empty($this->brackets) && preg_match($this->regexes['lex_block'], $this->code, $match, null, $this->cursor)) {
- $this->pushToken(Twig_Token::BLOCK_END_TYPE);
- $this->moveCursor($match[0]);
- $this->popState();
- } else {
- $this->lexExpression();
- }
- }
-
- protected function lexVar()
- {
- if (empty($this->brackets) && preg_match($this->regexes['lex_var'], $this->code, $match, null, $this->cursor)) {
- $this->pushToken(Twig_Token::VAR_END_TYPE);
- $this->moveCursor($match[0]);
- $this->popState();
- } 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->regexes['operator'], $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)) {
- $number = (float) $match[0]; // floats
- if (ctype_digit($match[0]) && $number <= PHP_INT_MAX) {
- $number = (int) $match[0]; // integers lower than the maximum
- }
- $this->pushToken(Twig_Token::NUMBER_TYPE, $number);
- $this->moveCursor($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]);
- }
- // opening double quoted string
- elseif (preg_match(self::REGEX_DQ_STRING_DELIM, $this->code, $match, null, $this->cursor)) {
- $this->brackets[] = array('"', $this->lineno);
- $this->pushState(self::STATE_STRING);
- $this->moveCursor($match[0]);
- }
- // unlexable
- else {
- throw new Twig_Error_Syntax(sprintf('Unexpected character "%s"', $this->code[$this->cursor]), $this->lineno, $this->filename);
- }
- }
-
- protected function lexRawData()
- {
- if (!preg_match($this->regexes['lex_raw_data'], $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);
- $this->moveCursor($text.$match[0][0]);
-
- if (false !== strpos($match[1][0], $this->options['whitespace_trim'])) {
- $text = rtrim($text);
- }
-
- $this->pushToken(Twig_Token::TEXT_TYPE, $text);
- }
-
- protected function lexComment()
- {
- if (!preg_match($this->regexes['lex_comment'], $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 lexString()
- {
- if (preg_match($this->regexes['interpolation_start'], $this->code, $match, null, $this->cursor)) {
- $this->brackets[] = array($this->options['interpolation'][0], $this->lineno);
- $this->pushToken(Twig_Token::INTERPOLATION_START_TYPE);
- $this->moveCursor($match[0]);
- $this->pushState(self::STATE_INTERPOLATION);
-
- } else if (preg_match(self::REGEX_DQ_STRING_PART, $this->code, $match, null, $this->cursor) && strlen($match[0]) > 0) {
- $this->pushToken(Twig_Token::STRING_TYPE, stripcslashes($match[0]));
- $this->moveCursor($match[0]);
-
- } else if (preg_match(self::REGEX_DQ_STRING_DELIM, $this->code, $match, null, $this->cursor)) {
-
- list($expect, $lineno) = array_pop($this->brackets);
- if ($this->code[$this->cursor] != '"') {
- throw new Twig_Error_Syntax(sprintf('Unclosed "%s"', $expect), $lineno, $this->filename);
- }
-
- $this->popState();
- ++$this->cursor;
- return;
- }
- }
-
- protected function lexInterpolation()
- {
- $bracket = end($this->brackets);
- if ($this->options['interpolation'][0] === $bracket[0] && preg_match($this->regexes['interpolation_end'], $this->code, $match, null, $this->cursor)) {
- array_pop($this->brackets);
- $this->pushToken(Twig_Token::INTERPOLATION_END_TYPE);
- $this->moveCursor($match[0]);
- $this->popState();
- } else {
- $this->lexExpression();
- }
- }
-
- protected function pushToken($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()
- {
- $operators = array_merge(
- array('='),
- array_keys($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, '/').'(?=[\s()])';
- } else {
- $regex[] = preg_quote($operator, '/');
- }
- }
-
- return '/'.implode('|', $regex).'/A';
- }
-
- protected function pushState($state)
- {
- $this->states[] = $this->state;
- $this->state = $state;
- }
-
- protected function popState()
- {
- if (0 === count($this->states)) {
- throw new Exception('Cannot pop state without a previous state');
- }
-
- $this->state = array_pop($this->states);
- }
- }
|