class Twig_Lexer in Zircon Profile 8
Same name and namespace in other branches
- 8.0 vendor/twig/twig/lib/Twig/Lexer.php \Twig_Lexer
Lexes a template string.
@author Fabien Potencier <fabien@symfony.com>
Hierarchy
- class \Twig_Lexer implements Twig_LexerInterface
Expanded class hierarchy of Twig_Lexer
File
- vendor/
twig/ twig/ lib/ Twig/ Lexer.php, line 18
View source
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;
protected $position;
protected $positions;
protected $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]+)?/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($this->options['interpolation'][1], '/') . '/A',
);
}
/**
* {@inheritdoc}
*/
public function tokenize($code, $filename = null) {
if (function_exists('mb_internal_encoding') && (int) ini_get('mbstring.func_overload') & 2) {
$mbEncoding = mb_internal_encoding();
mb_internal_encoding('ASCII');
}
else {
$mbEncoding = null;
}
$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, $this->filename);
}
if ($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]);
$this
->lexRawData($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, $this->filename);
}
}
// operators
if (preg_match($this->regexes['operator'], $this->code, $match, null, $this->cursor)) {
$this
->pushToken(Twig_Token::OPERATOR_TYPE, preg_replace('/\\s+/', ' ', $match[0]));
$this
->moveCursor($match[0]);
}
elseif (preg_match(self::REGEX_NAME, $this->code, $match, null, $this->cursor)) {
$this
->pushToken(Twig_Token::NAME_TYPE, $match[0]);
$this
->moveCursor($match[0]);
}
elseif (preg_match(self::REGEX_NUMBER, $this->code, $match, null, $this->cursor)) {
$number = (double) $match[0];
// floats
if (ctype_digit($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]);
}
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,
);
}
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;
}
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]);
}
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]);
}
else {
throw new Twig_Error_Syntax(sprintf('Unexpected character "%s".', $this->code[$this->cursor]), $this->lineno, $this->filename);
}
}
protected function lexRawData($tag) {
if ('raw' === $tag) {
@trigger_error(sprintf('Twig Tag "raw" is deprecated. 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->filename);
}
$text = substr($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);
}
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->filename);
}
$this
->popState();
++$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);
}
}