Subversion-Projekte lars-tiefland.laravel_shop

<?php declare(strict_types=1);

namespace PhpParser\Internal;

/**

 * Provides operations on token streams, for use by pretty printer.

 *

 * @internal

 */

class TokenStream

{

    /** @var array Tokens (in token_get_all format) */

    private $tokens;

    /** @var int[] Map from position to indentation */

    private $indentMap;

    /**

     * Create token stream instance.

     *

     * @param array $tokens Tokens in token_get_all() format

     */

    public function __construct(array $tokens) {

        $this->tokens = $tokens;

        $this->indentMap = $this->calcIndentMap();

    }

    /**

     * Whether the given position is immediately surrounded by parenthesis.

     *

     * @param int $startPos Start position

     * @param int $endPos   End position

     *

     * @return bool

     */

    public function haveParens(int $startPos, int $endPos) : bool {

        return $this->haveTokenImmediatelyBefore($startPos, '(')

            && $this->haveTokenImmediatelyAfter($endPos, ')');

    }

    /**

     * Whether the given position is immediately surrounded by braces.

     *

     * @param int $startPos Start position

     * @param int $endPos   End position

     *

     * @return bool

     */

    public function haveBraces(int $startPos, int $endPos) : bool {

        return ($this->haveTokenImmediatelyBefore($startPos, '{')

                || $this->haveTokenImmediatelyBefore($startPos, T_CURLY_OPEN))

            && $this->haveTokenImmediatelyAfter($endPos, '}');

    }

    /**

     * Check whether the position is directly preceded by a certain token type.

     *

     * During this check whitespace and comments are skipped.

     *

     * @param int        $pos               Position before which the token should occur

     * @param int|string $expectedTokenType Token to check for

     *

     * @return bool Whether the expected token was found

     */

    public function haveTokenImmediatelyBefore(int $pos, $expectedTokenType) : bool {

        $tokens = $this->tokens;

        $pos--;

        for (; $pos >= 0; $pos--) {

            $tokenType = $tokens[$pos][0];

            if ($tokenType === $expectedTokenType) {

                return true;

            }

            if ($tokenType !== \T_WHITESPACE

                && $tokenType !== \T_COMMENT && $tokenType !== \T_DOC_COMMENT) {

                break;

            }

        }

        return false;

    }

    /**

     * Check whether the position is directly followed by a certain token type.

     *

     * During this check whitespace and comments are skipped.

     *

     * @param int        $pos               Position after which the token should occur

     * @param int|string $expectedTokenType Token to check for

     *

     * @return bool Whether the expected token was found

     */

    public function haveTokenImmediatelyAfter(int $pos, $expectedTokenType) : bool {

        $tokens = $this->tokens;

        $pos++;

        for (; $pos < \count($tokens); $pos++) {

            $tokenType = $tokens[$pos][0];

            if ($tokenType === $expectedTokenType) {

                return true;

            }

            if ($tokenType !== \T_WHITESPACE

                && $tokenType !== \T_COMMENT && $tokenType !== \T_DOC_COMMENT) {

                break;

            }

        }

        return false;

    }

    public function skipLeft(int $pos, $skipTokenType) {

        $tokens = $this->tokens;

        $pos = $this->skipLeftWhitespace($pos);

        if ($skipTokenType === \T_WHITESPACE) {

            return $pos;

        }

        if ($tokens[$pos][0] !== $skipTokenType) {

            // Shouldn't happen. The skip token MUST be there

            throw new \Exception('Encountered unexpected token');

        }

        $pos--;

        return $this->skipLeftWhitespace($pos);

    }

    public function skipRight(int $pos, $skipTokenType) {

        $tokens = $this->tokens;

        $pos = $this->skipRightWhitespace($pos);

        if ($skipTokenType === \T_WHITESPACE) {

            return $pos;

        }

        if ($tokens[$pos][0] !== $skipTokenType) {

            // Shouldn't happen. The skip token MUST be there

            throw new \Exception('Encountered unexpected token');

        }

        $pos++;

        return $this->skipRightWhitespace($pos);

    }

    /**

     * Return first non-whitespace token position smaller or equal to passed position.

     *

     * @param int $pos Token position

     * @return int Non-whitespace token position

     */

    public function skipLeftWhitespace(int $pos) {

        $tokens = $this->tokens;

        for (; $pos >= 0; $pos--) {

            $type = $tokens[$pos][0];

            if ($type !== \T_WHITESPACE && $type !== \T_COMMENT && $type !== \T_DOC_COMMENT) {

                break;

            }

        }

        return $pos;

    }

    /**

     * Return first non-whitespace position greater or equal to passed position.

     *

     * @param int $pos Token position

     * @return int Non-whitespace token position

     */

    public function skipRightWhitespace(int $pos) {

        $tokens = $this->tokens;

        for ($count = \count($tokens); $pos < $count; $pos++) {

            $type = $tokens[$pos][0];

            if ($type !== \T_WHITESPACE && $type !== \T_COMMENT && $type !== \T_DOC_COMMENT) {

                break;

            }

        }

        return $pos;

    }

    public function findRight(int $pos, $findTokenType) {

        $tokens = $this->tokens;

        for ($count = \count($tokens); $pos < $count; $pos++) {

            $type = $tokens[$pos][0];

            if ($type === $findTokenType) {

                return $pos;

            }

        }

        return -1;

    }

    /**

     * Whether the given position range contains a certain token type.

     *

     * @param int $startPos Starting position (inclusive)

     * @param int $endPos Ending position (exclusive)

     * @param int|string $tokenType Token type to look for

     * @return bool Whether the token occurs in the given range

     */

    public function haveTokenInRange(int $startPos, int $endPos, $tokenType) {

        $tokens = $this->tokens;

        for ($pos = $startPos; $pos < $endPos; $pos++) {

            if ($tokens[$pos][0] === $tokenType) {

                return true;

            }

        }

        return false;

    }

    public function haveBracesInRange(int $startPos, int $endPos) {

        return $this->haveTokenInRange($startPos, $endPos, '{')

            || $this->haveTokenInRange($startPos, $endPos, T_CURLY_OPEN)

            || $this->haveTokenInRange($startPos, $endPos, '}');

    }

    public function haveTagInRange(int $startPos, int $endPos): bool {

        return $this->haveTokenInRange($startPos, $endPos, \T_OPEN_TAG)

            || $this->haveTokenInRange($startPos, $endPos, \T_CLOSE_TAG);

    }

    /**

     * Get indentation before token position.

     *

     * @param int $pos Token position

     *

     * @return int Indentation depth (in spaces)

     */

    public function getIndentationBefore(int $pos) : int {

        return $this->indentMap[$pos];

    }

    /**

     * Get the code corresponding to a token offset range, optionally adjusted for indentation.

     *

     * @param int $from   Token start position (inclusive)

     * @param int $to     Token end position (exclusive)

     * @param int $indent By how much the code should be indented (can be negative as well)

     *

     * @return string Code corresponding to token range, adjusted for indentation

     */

    public function getTokenCode(int $from, int $to, int $indent) : string {

        $tokens = $this->tokens;

        $result = '';

        for ($pos = $from; $pos < $to; $pos++) {

            $token = $tokens[$pos];

            if (\is_array($token)) {

                $type = $token[0];

                $content = $token[1];

                if ($type === \T_CONSTANT_ENCAPSED_STRING || $type === \T_ENCAPSED_AND_WHITESPACE) {

                    $result .= $content;

                } else {

                    // TODO Handle non-space indentation

                    if ($indent < 0) {

                        $result .= str_replace("\n" . str_repeat(" ", -$indent), "\n", $content);

                    } elseif ($indent > 0) {

                        $result .= str_replace("\n", "\n" . str_repeat(" ", $indent), $content);

                    } else {

                        $result .= $content;

                    }

                }

            } else {

                $result .= $token;

            }

        }

        return $result;

    }

    /**

     * Precalculate the indentation at every token position.

     *

     * @return int[] Token position to indentation map

     */

    private function calcIndentMap() {

        $indentMap = [];

        $indent = 0;

        foreach ($this->tokens as $token) {

            $indentMap[] = $indent;

            if ($token[0] === \T_WHITESPACE) {

                $content = $token[1];

                $newlinePos = \strrpos($content, "\n");

                if (false !== $newlinePos) {

                    $indent = \strlen($content) - $newlinePos - 1;

                }

            }

        }

        // Add a sentinel for one past end of the file

        $indentMap[] = $indent;

        return $indentMap;

    }

}