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<?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. */ namespace Twig; use Twig\Error\SyntaxError; /** * Lexes a template string. * * @author Fabien Potencier <fabien@symfony.com> */ class Lexer { private $tokens; private $code; private $cursor; private $lineno; private $end; private $state; private $states; private $brackets; private $env; private $source; private $options; private $regexes; private $position; private $positions; private $currentVarBlockLine; 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]+)?([Ee][\+\-][0-9]+)?/A'; const REGEX_STRING = '/"([^#"\\\\]*(?:\\\\.[^#"\\\\]*)*)"|\'([^\'\\\\]*(?:\\\\.[^\'\\\\]*)*)\'/As'; const REGEX_DQ_STRING_DELIM = '/"/A'; const REGEX_DQ_STRING_PART = '/[^#"\\\\]*(?:(?:\\\\.|#(?!\{))[^#"\\\\]*)*/As'; const PUNCTUATION = '()[]{}?:.,|'; public function __construct(Environment $env, array $options = []) { $this->env = $env; $this->options = array_merge([ 'tag_comment' => ['{#', '#}'], 'tag_block' => ['{%', '%}'], 'tag_variable' => ['{{', '}}'], 'whitespace_trim' => '-', 'whitespace_line_trim' => '~', 'whitespace_line_chars' => ' \t\0\x0B', 'interpolation' => ['#{', '}'], ], $options); // when PHP 7.3 is the min version, we will be able to remove the '#' part in preg_quote as it's part of the default $this->regexes = [ // }} 'lex_var' => '{ \s* (?:'. preg_quote($this->options['whitespace_trim'].$this->options['tag_variable'][1], '#').'\s*'. // -}}\s* '|'. preg_quote($this->options['whitespace_line_trim'].$this->options['tag_variable'][1], '#').'['.$this->options['whitespace_line_chars'].']*'. // ~}}[ \t\0\x0B]* '|'. preg_quote($this->options['tag_variable'][1], '#'). // }} ') }Ax', // %} 'lex_block' => '{ \s* (?:'. preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '#').'\s*\n?'. // -%}\s*\n? '|'. preg_quote($this->options['whitespace_line_trim'].$this->options['tag_block'][1], '#').'['.$this->options['whitespace_line_chars'].']*'. // ~%}[ \t\0\x0B]* '|'. preg_quote($this->options['tag_block'][1], '#').'\n?'. // %}\n? ') }Ax', // {% endverbatim %} 'lex_raw_data' => '{'. preg_quote($this->options['tag_block'][0], '#'). // {% '('. $this->options['whitespace_trim']. // - '|'. $this->options['whitespace_line_trim']. // ~ ')?\s*endverbatim\s*'. '(?:'. preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '#').'\s*'. // -%} '|'. preg_quote($this->options['whitespace_line_trim'].$this->options['tag_block'][1], '#').'['.$this->options['whitespace_line_chars'].']*'. // ~%}[ \t\0\x0B]* '|'. preg_quote($this->options['tag_block'][1], '#'). // %} ') }sx', 'operator' => $this->getOperatorRegex(), // #} 'lex_comment' => '{ (?:'. preg_quote($this->options['whitespace_trim']).preg_quote($this->options['tag_comment'][1], '#').'\s*\n?'. // -#}\s*\n? '|'. preg_quote($this->options['whitespace_line_trim'].$this->options['tag_comment'][1], '#').'['.$this->options['whitespace_line_chars'].']*'. // ~#}[ \t\0\x0B]* '|'. preg_quote($this->options['tag_comment'][1], '#').'\n?'. // #}\n? ') }sx', // verbatim %} 'lex_block_raw' => '{ \s*verbatim\s* (?:'. preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '#').'\s*'. // -%}\s* '|'. preg_quote($this->options['whitespace_line_trim'].$this->options['tag_block'][1], '#').'['.$this->options['whitespace_line_chars'].']*'. // ~%}[ \t\0\x0B]* '|'. preg_quote($this->options['tag_block'][1], '#'). // %} ') }Asx', 'lex_block_line' => '{\s*line\s+(\d+)\s*'.preg_quote($this->options['tag_block'][1], '#').'}As', // {{ or {% or {# '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'], '#'). // - '|'. preg_quote($this->options['whitespace_line_trim'], '#'). // ~ ')? }sx', 'interpolation_start' => '{'.preg_quote($this->options['interpolation'][0], '#').'\s*}A', 'interpolation_end' => '{\s*'.preg_quote($this->options['interpolation'][1], '#').'}A', ]; } public function tokenize(Source $source) { $this->source = $source; $this->code = str_replace(["\r\n", "\r"], "\n", $source->getCode()); $this->cursor = 0; $this->lineno = 1; $this->end = \strlen($this->code); $this->tokens = []; $this->state = self::STATE_DATA; $this->states = []; $this->brackets = []; $this->position = -1; // find all token starts in one go preg_match_all($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; } } $this->pushToken(/* Token::EOF_TYPE */ -1); if (!empty($this->brackets)) { list($expect, $lineno) = array_pop($this->brackets); throw new SyntaxError(sprintf('Unclosed "%s".', $expect), $lineno, $this->source); } return new TokenStream($this->tokens, $this->source); } private function lexData() { // if no matches are left we return the rest of the template as simple text token if ($this->position == \count($this->positions[0]) - 1) { $this->pushToken(/* Token::TEXT_TYPE */ 0, substr($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] - $this->cursor); // trim? if (isset($this->positions[2][$this->position][0])) { if ($this->options['whitespace_trim'] === $this->positions[2][$this->position][0]) { // whitespace_trim detected ({%-, {{- or {#-) $text = rtrim($text); } elseif ($this->options['whitespace_line_trim'] === $this->positions[2][$this->position][0]) { // whitespace_line_trim detected ({%~, {{~ or {#~) // don't trim \r and \n $text = rtrim($text, " \t\0\x0B"); } } $this->pushToken(/* Token::TEXT_TYPE */ 0, $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, 0, $this->cursor)) { $this->moveCursor($match[0]); $this->lexRawData(); // {% line \d+ %} } elseif (preg_match($this->regexes['lex_block_line'], $this->code, $match, 0, $this->cursor)) { $this->moveCursor($match[0]); $this->lineno = (int) $match[1]; } else { $this->pushToken(/* Token::BLOCK_START_TYPE */ 1); $this->pushState(self::STATE_BLOCK); $this->currentVarBlockLine = $this->lineno; } break; case $this->options['tag_variable'][0]: $this->pushToken(/* Token::VAR_START_TYPE */ 2); $this->pushState(self::STATE_VAR); $this->currentVarBlockLine = $this->lineno; break; } } private function lexBlock() { if (empty($this->brackets) && preg_match($this->regexes['lex_block'], $this->code, $match, 0, $this->cursor)) { $this->pushToken(/* Token::BLOCK_END_TYPE */ 3); $this->moveCursor($match[0]); $this->popState(); } else { $this->lexExpression(); } } private function lexVar() { if (empty($this->brackets) && preg_match($this->regexes['lex_var'], $this->code, $match, 0, $this->cursor)) { $this->pushToken(/* Token::VAR_END_TYPE */ 4); $this->moveCursor($match[0]); $this->popState(); } else { $this->lexExpression(); } } private function lexExpression() { // whitespace if (preg_match('/\s+/A', $this->code, $match, 0, $this->cursor)) { $this->moveCursor($match[0]); if ($this->cursor >= $this->end) { throw new SyntaxError(sprintf('Unclosed "%s".', self::STATE_BLOCK === $this->state ? 'block' : 'variable'), $this->currentVarBlockLine, $this->source); } } // arrow function if ('=' === $this->code[$this->cursor] && '>' === $this->code[$this->cursor + 1]) { $this->pushToken(Token::ARROW_TYPE, '=>'); $this->moveCursor('=>'); } // operators elseif (preg_match($this->regexes['operator'], $this->code, $match, 0, $this->cursor)) { $this->pushToken(/* Token::OPERATOR_TYPE */ 8, preg_replace('/\s+/', ' ', $match[0])); $this->moveCursor($match[0]); } // names elseif (preg_match(self::REGEX_NAME, $this->code, $match, 0, $this->cursor)) { $this->pushToken(/* Token::NAME_TYPE */ 5, $match[0]); $this->moveCursor($match[0]); } // numbers elseif (preg_match(self::REGEX_NUMBER, $this->code, $match, 0, $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(/* Token::NUMBER_TYPE */ 6, $number); $this->moveCursor($match[0]); } // punctuation elseif (false !== strpos(self::PUNCTUATION, $this->code[$this->cursor])) { // opening bracket if (false !== strpos('([{', $this->code[$this->cursor])) { $this->brackets[] = [$this->code[$this->cursor], $this->lineno]; } // closing bracket elseif (false !== strpos(')]}', $this->code[$this->cursor])) { if (empty($this->brackets)) { throw new SyntaxError(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 SyntaxError(sprintf('Unclosed "%s".', $expect), $lineno, $this->source); } } $this->pushToken(/* Token::PUNCTUATION_TYPE */ 9, $this->code[$this->cursor]); ++$this->cursor; } // strings elseif (preg_match(self::REGEX_STRING, $this->code, $match, 0, $this->cursor)) { $this->pushToken(/* Token::STRING_TYPE */ 7, stripcslashes(substr($match[0], 1, -1))); $this->moveCursor($match[0]); } // opening double quoted string elseif (preg_match(self::REGEX_DQ_STRING_DELIM, $this->code, $match, 0, $this->cursor)) { $this->brackets[] = ['"', $this->lineno]; $this->pushState(self::STATE_STRING); $this->moveCursor($match[0]); } // unlexable else { throw new SyntaxError(sprintf('Unexpected character "%s".', $this->code[$this->cursor]), $this->lineno, $this->source); } } private function lexRawData() { if (!preg_match($this->regexes['lex_raw_data'], $this->code, $match, PREG_OFFSET_CAPTURE, $this->cursor)) { throw new SyntaxError('Unexpected end of file: Unclosed "verbatim" block.', $this->lineno, $this->source); } $text = substr($this->code, $this->cursor, $match[0][1] - $this->cursor); $this->moveCursor($text.$match[0][0]); // trim? if (isset($match[1][0])) { if ($this->options['whitespace_trim'] === $match[1][0]) { // whitespace_trim detected ({%-, {{- or {#-) $text = rtrim($text); } else { // whitespace_line_trim detected ({%~, {{~ or {#~) // don't trim \r and \n $text = rtrim($text, " \t\0\x0B"); } } $this->pushToken(/* Token::TEXT_TYPE */ 0, $text); } private function lexComment() { if (!preg_match($this->regexes['lex_comment'], $this->code, $match, PREG_OFFSET_CAPTURE, $this->cursor)) { throw new SyntaxError('Unclosed comment.', $this->lineno, $this->source); } $this->moveCursor(substr($this->code, $this->cursor, $match[0][1] - $this->cursor).$match[0][0]); } private function lexString() { if (preg_match($this->regexes['interpolation_start'], $this->code, $match, 0, $this->cursor)) { $this->brackets[] = [$this->options['interpolation'][0], $this->lineno]; $this->pushToken(/* Token::INTERPOLATION_START_TYPE */ 10); $this->moveCursor($match[0]); $this->pushState(self::STATE_INTERPOLATION); } elseif (preg_match(self::REGEX_DQ_STRING_PART, $this->code, $match, 0, $this->cursor) && \strlen($match[0]) > 0) { $this->pushToken(/* Token::STRING_TYPE */ 7, stripcslashes($match[0])); $this->moveCursor($match[0]); } elseif (preg_match(self::REGEX_DQ_STRING_DELIM, $this->code, $match, 0, $this->cursor)) { list($expect, $lineno) = array_pop($this->brackets); if ('"' != $this->code[$this->cursor]) { throw new SyntaxError(sprintf('Unclosed "%s".', $expect), $lineno, $this->source); } $this->popState(); ++$this->cursor; } else { // unlexable throw new SyntaxError(sprintf('Unexpected character "%s".', $this->code[$this->cursor]), $this->lineno, $this->source); } } private function lexInterpolation() { $bracket = end($this->brackets); if ($this->options['interpolation'][0] === $bracket[0] && preg_match($this->regexes['interpolation_end'], $this->code, $match, 0, $this->cursor)) { array_pop($this->brackets); $this->pushToken(/* Token::INTERPOLATION_END_TYPE */ 11); $this->moveCursor($match[0]); $this->popState(); } else { $this->lexExpression(); } } private function pushToken($type, $value = '') { // do not push empty text tokens if (/* Token::TEXT_TYPE */ 0 === $type && '' === $value) { return; } $this->tokens[] = new Token($type, $value, $this->lineno); } private function moveCursor($text) { $this->cursor += \strlen($text); $this->lineno += substr_count($text, "\n"); } private function getOperatorRegex() { $operators = array_merge( ['='], array_keys($this->env->getUnaryOperators()), array_keys($this->env->getBinaryOperators()) ); $operators = array_combine($operators, array_map('strlen', $operators)); arsort($operators); $regex = []; foreach ($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('|', $regex).'/A'; } private function pushState($state) { $this->states[] = $this->state; $this->state = $state; } private function popState() { if (0 === \count($this->states)) { throw new \LogicException('Cannot pop state without a previous state.'); } $this->state = array_pop($this->states); } } class_alias('Twig\Lexer', 'Twig_Lexer');