✏️ Editing: Lexer.php Writable

<?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 ElementorDeps\Twig;

use ElementorDeps\Twig\Error\SyntaxError;
/**
 * @author Fabien Potencier <fabien@symfony.com>
 */
class Lexer
{
    private $isInitialized = \false;
    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;
    public const STATE_DATA = 0;
    public const STATE_BLOCK = 1;
    public const STATE_VAR = 2;
    public const STATE_STRING = 3;
    public const STATE_INTERPOLATION = 4;
    public const REGEX_NAME = '/[a-zA-Z_\\x7f-\\xff][a-zA-Z0-9_\\x7f-\\xff]*/A';
    public const REGEX_NUMBER = '/[0-9]+(?:\\.[0-9]+)?([Ee][\\+\\-][0-9]+)?/A';
    public const REGEX_STRING = '/"([^#"\\\\]*(?:\\\\.[^#"\\\\]*)*)"|\'([^\'\\\\]*(?:\\\\.[^\'\\\\]*)*)\'/As';
    public const REGEX_DQ_STRING_DELIM = '/"/A';
    public const REGEX_DQ_STRING_PART = '/[^#"\\\\]*(?:(?:\\\\.|#(?!\\{))[^#"\\\\]*)*/As';
    public 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' => ['#{', '}']], $options);
    }
    private function initialize()
    {
        if ($this->isInitialized) {
            return;
        }
        // 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'] . $this->options['tag_variable'][1], '#') . '\\s*' . '|' . \preg_quote($this->options['whitespace_line_trim'] . $this->options['tag_variable'][1], '#') . '[' . $this->options['whitespace_line_chars'] . ']*' . '|' . \preg_quote($this->options['tag_variable'][1], '#') . ')
            }Ax',
            // %}
            'lex_block' => '{
                \\s*
                (?:' . \preg_quote($this->options['whitespace_trim'] . $this->options['tag_block'][1], '#') . '\\s*\\n?' . '|' . \preg_quote($this->options['whitespace_line_trim'] . $this->options['tag_block'][1], '#') . '[' . $this->options['whitespace_line_chars'] . ']*' . '|' . \preg_quote($this->options['tag_block'][1], '#') . '\\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], '#') . '[' . $this->options['whitespace_line_chars'] . ']*' . '|' . \preg_quote($this->options['tag_block'][1], '#') . ')
            }sx',
            'operator' => $this->getOperatorRegex(),
            // #}
            'lex_comment' => '{
                (?:' . \preg_quote($this->options['whitespace_trim'] . $this->options['tag_comment'][1], '#') . '\\s*\\n?' . '|' . \preg_quote($this->options['whitespace_line_trim'] . $this->options['tag_comment'][1], '#') . '[' . $this->options['whitespace_line_chars'] . ']*' . '|' . \preg_quote($this->options['tag_comment'][1], '#') . '\\n?' . ')
            }sx',
            // verbatim %}
            'lex_block_raw' => '{
                \\s*verbatim\\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], '#') . '[' . $this->options['whitespace_line_chars'] . ']*' . '|' . \preg_quote($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',
        ];
        $this->isInitialized = \true;
    }
    public function tokenize(Source $source) : TokenStream
    {
        $this->initialize();
        $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)) {
            [$expect, $lineno] = \array_pop($this->brackets);
            throw new SyntaxError(\sprintf('Unclosed "%s".', $expect), $lineno, $this->source);
        }
        return new TokenStream($this->tokens, $this->source);
    }
    private function lexData() : void
    {
        // if no matches are left we return the rest of the template as simple text token
        if ($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\x00\v");
            }
        }
        $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 = $this->lineno;
                break;
        }
    }
    private function lexBlock() : void
    {
        if (empty($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 {
            $this->lexExpression();
        }
    }
    private function lexVar() : void
    {
        if (empty($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() : void
    {
        // 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);
            }
        }
        // spread operator
        if ('.' === $this->code[$this->cursor] && $this->cursor + 2 < $this->end && '.' === $this->code[$this->cursor + 1] && '.' === $this->code[$this->cursor + 2]) {
            $this->pushToken(Token::SPREAD_TYPE, '...');
            $this->moveCursor('...');
        } elseif ('=' === $this->code[$this->cursor] && $this->cursor + 1 < $this->end && '>' === $this->code[$this->cursor + 1]) {
            $this->pushToken(Token::ARROW_TYPE, '=>');
            $this->moveCursor('=>');
        } elseif (\preg_match($this->regexes['operator'], $this->code, $match, 0, $this->cursor)) {
            $this->pushToken(
                /* Token::OPERATOR_TYPE */
                8,
                \preg_replace('/\\s+/', ' ', $match[0])
            );
            $this->moveCursor($match[0]);
        } elseif (\preg_match(self::REGEX_NAME, $this->code, $match, 0, $this->cursor)) {
            $this->pushToken(
                /* Token::NAME_TYPE */
                5,
                $match[0]
            );
            $this->moveCursor($match[0]);
        } 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]);
        } elseif (\str_contains(self::PUNCTUATION, $this->code[$this->cursor])) {
            // opening bracket
            if (\str_contains('([{', $this->code[$this->cursor])) {
                $this->brackets[] = [$this->code[$this->cursor], $this->lineno];
            } elseif (\str_contains(')]}', $this->code[$this->cursor])) {
                if (empty($this->brackets)) {
                    throw new SyntaxError(\sprintf('Unexpected "%s".', $this->code[$this->cursor]), $this->lineno, $this->source);
                }
                [$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;
        } 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]);
        } 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]);
        } else {
            throw new SyntaxError(\sprintf('Unexpected character "%s".', $this->code[$this->cursor]), $this->lineno, $this->source);
        }
    }
    private function lexRawData() : void
    {
        if (!\preg_match($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\x00\v");
            }
        }
        $this->pushToken(
            /* Token::TEXT_TYPE */
            0,
            $text
        );
    }
    private function lexComment() : void
    {
        if (!\preg_match($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) . $match[0][0]);
    }
    private function lexString() : void
    {
        if (\preg_match($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) && '' !== $match[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, $this->cursor)) {
            [$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() : void
    {
        $bracket = \end($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 = '') : void
    {
        // do not push empty text tokens
        if (0 === $type && '' === $value) {
            return;
        }
        $this->tokens[] = new Token($type, $value, $this->lineno);
    }
    private function moveCursor($text) : void
    {
        $this->cursor += \strlen($text);
        $this->lineno += \substr_count($text, "\n");
    }
    private function getOperatorRegex() : string
    {
        $operators = \array_merge(['='], \array_keys($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, a parenthesis, an opening map [ or sequence {
            $r = \preg_quote($operator, '/');
            if (\ctype_alpha($operator[$length - 1])) {
                $r .= '(?=[\\s()\\[{])';
            }
            // an operator that begins with a character must not have a dot or pipe before
            if (\ctype_alpha($operator[0])) {
                $r = '(?<![\\.\\|])' . $r;
            }
            // 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) : void
    {
        $this->states[] = $this->state;
        $this->state = $state;
    }
    private function popState() : void
    {
        if (0 === \count($this->states)) {
            throw new \LogicException('Cannot pop state without a previous state.');
        }
        $this->state = \array_pop($this->states);
    }
}

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