--- /dev/null
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ * (c) 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.
+ *
+ * @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;
+ // to be renamed to $name in 2.0 (where it is private)
+ protected $filename;
+ protected $options;
+ protected $regexes;
+ protected $position;
+ protected $positions;
+ protected $currentVarBlockLine;
+
+ private $source;
+
+ 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*(?:end%s)\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|verbatim)\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',
+ );
+ }
+
+ public function tokenize($code, $name = null)
+ {
+ if (!$code instanceof Twig_Source) {
+ @trigger_error(sprintf('Passing a string as the $code argument of %s() is deprecated since version 1.27 and will be removed in 2.0. Pass a Twig_Source instance instead.', __METHOD__), E_USER_DEPRECATED);
+ $this->source = new Twig_Source($code, $name);
+ } else {
+ $this->source = $code;
+ }
+
+ if (((int) ini_get('mbstring.func_overload')) & 2) {
+ @trigger_error('Support for having "mbstring.func_overload" different from 0 is deprecated version 1.29 and will be removed in 2.0.', E_USER_DEPRECATED);
+ }
+
+ if (function_exists('mb_internal_encoding') && ((int) ini_get('mbstring.func_overload')) & 2) {
+ $mbEncoding = mb_internal_encoding();
+ mb_internal_encoding('ASCII');
+ } else {
+ $mbEncoding = null;
+ }
+
+ $this->code = str_replace(array("\r\n", "\r"), "\n", $this->source->getCode());
+ $this->filename = $this->source->getName();
+ $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, $this->source);
+ }
+
+ if ($mbEncoding) {
+ mb_internal_encoding($mbEncoding);
+ }
+
+ return new Twig_TokenStream($this->tokens, $this->source);
+ }
+
+ protected function lexData()
+ {
+ // if no matches are left we return the rest of the template as simple text token
+ if ($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]);
+ $this->lexRawData($match[1]);
+ // {% line \d+ %}
+ } elseif (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);
+ $this->currentVarBlockLine = $this->lineno;
+ }
+ break;
+
+ case $this->options['tag_variable'][0]:
+ $this->pushToken(Twig_Token::VAR_START_TYPE);
+ $this->pushState(self::STATE_VAR);
+ $this->currentVarBlockLine = $this->lineno;
+ break;
+ }
+ }
+
+ protected function lexBlock()
+ {
+ if (empty($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('Unclosed "%s".', $this->state === self::STATE_BLOCK ? 'block' : 'variable'), $this->currentVarBlockLine, $this->source);
+ }
+ }
+
+ // operators
+ if (preg_match($this->regexes['operator'], $this->code, $match, null, $this->cursor)) {
+ $this->pushToken(Twig_Token::OPERATOR_TYPE, preg_replace('/\s+/', ' ', $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, $this->source);
+ }
+
+ list($expect, $lineno) = array_pop($this->brackets);
+ if ($this->code[$this->cursor] != strtr($expect, '([{', ')]}')) {
+ throw new Twig_Error_Syntax(sprintf('Unclosed "%s".', $expect), $lineno, $this->source);
+ }
+ }
+
+ $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, $this->source);
+ }
+ }
+
+ protected function lexRawData($tag)
+ {
+ if ('raw' === $tag) {
+ @trigger_error(sprintf('Twig Tag "raw" is deprecated since version 1.21. Use "verbatim" instead in %s at line %d.', $this->filename, $this->lineno), E_USER_DEPRECATED);
+ }
+
+ if (!preg_match(str_replace('%s', $tag, $this->regexes['lex_raw_data']), $this->code, $match, PREG_OFFSET_CAPTURE, $this->cursor)) {
+ throw new Twig_Error_Syntax(sprintf('Unexpected end of file: Unclosed "%s" block.', $tag), $this->lineno, $this->source);
+ }
+
+ $text = substr($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->source);
+ }
+
+ $this->moveCursor(substr($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);
+ } elseif (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]);
+ } elseif (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->source);
+ }
+
+ $this->popState();
+ ++$this->cursor;
+ }
+ }
+
+ 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])) {
+ $r = preg_quote($operator, '/').'(?=[\s()])';
+ } else {
+ $r = preg_quote($operator, '/');
+ }
+
+ // an operator with a space can be any amount of whitespaces
+ $r = preg_replace('/\s+/', '\s+', $r);
+
+ $regex[] = $r;
+ }
+
+ 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);
+ }
+}
projects / yaffs-website / blobdiff