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<?php

namespace Laminas\Config\Reader;

use Laminas\Config\Exception;

use function array_replace_recursive;
use function dirname;
use function explode;
use function file_get_contents;
use function gettype;
use function is_file;
use function is_object;
use function is_readable;
use function is_string;
use function sprintf;
use function stripslashes;
use function strlen;
use function strpos;
use function strrpos;
use function substr;
use function trim;

/**
 * Java-style properties config reader.
 */
class JavaProperties implements ReaderInterface
{
    public const DELIMITER_DEFAULT = ':';
    public const WHITESPACE_TRIM   = true;
    public const WHITESPACE_KEEP   = false;

    /**
     * Directory of the Java-style properties file
     *
     * @var string
     */
    protected $directory;

    /**
     * Delimiter for key/value pairs.
     *
     * @var string
     */
    private $delimiter;

    /**
     * Whether or not to trim whitespace from discovered keys and values.
     *
     * @var bool
     */
    private $trimWhitespace;

    /**
     * @param string $delimiter Delimiter to use for key/value pairs; defaults
     *     to self::DELIMITER_DEFAULT (':')
     * @param bool $trimWhitespace
     * @throws Exception\InvalidArgumentException For invalid $delimiter values.
     */
    public function __construct($delimiter = self::DELIMITER_DEFAULT, $trimWhitespace = self::WHITESPACE_KEEP)
    {
        if (! is_string($delimiter) || '' === $delimiter) {
            throw new Exception\InvalidArgumentException(sprintf(
                'Invalid delimiter of type "%s"; must be a non-empty string',
                is_object($delimiter) ? $delimiter::class : gettype($delimiter)
            ));
        }

        $this->delimiter      = $delimiter;
        $this->trimWhitespace = (bool) $trimWhitespace;
    }

    /**
     * fromFile(): defined by Reader interface.
     *
     * @see    ReaderInterface::fromFile()
     *
     * @param  string $filename
     * @return array
     * @throws Exception\RuntimeException If the file cannot be read.
     */
    public function fromFile($filename)
    {
        if (! is_file($filename) || ! is_readable($filename)) {
            throw new Exception\RuntimeException(sprintf(
                "File '%s' doesn't exist or not readable",
                $filename
            ));
        }

        $this->directory = dirname($filename);

        $config = $this->parse(file_get_contents($filename));

        return $this->process($config);
    }

    /**
     * fromString(): defined by Reader interface.
     *
     * @see    ReaderInterface::fromString()
     *
     * @param  string $string
     * @return array
     * @throws Exception\RuntimeException If an @include key is found.
     */
    public function fromString($string)
    {
        if (empty($string)) {
            return [];
        }

        $this->directory = null;

        $config = $this->parse($string);

        return $this->process($config);
    }

    /**
     * Process the array for @include
     *
     * @param  array $data
     * @return array
     * @throws Exception\RuntimeException If an @include key is found.
     */
    protected function process(array $data)
    {
        foreach ($data as $key => $value) {
            if (trim($key) === '@include') {
                if ($this->directory === null) {
                    throw new Exception\RuntimeException('Cannot process @include statement for a string');
                }
                $reader = clone $this;
                unset($data[$key]);
                $data = array_replace_recursive($data, $reader->fromFile($this->directory . '/' . $value));
            }
        }
        return $data;
    }

    /**
     * Parse Java-style properties string
     *
     * @todo Support use of the equals sign "key=value" as key-value delimiter
     * @todo Ignore whitespace that precedes text past the first line of multiline values
     * @param  string $string
     * @return array
     */
    protected function parse($string)
    {
        $delimiter          = $this->delimiter;
        $delimLength        = strlen($delimiter);
        $result             = [];
        $lines              = explode("\n", $string);
        $key                = '';
        $isWaitingOtherLine = false;
        foreach ($lines as $i => $line) {
            // Ignore empty lines and commented lines
            if (
                empty($line)
                || (! $isWaitingOtherLine && strpos($line, "#") === 0)
                || (! $isWaitingOtherLine && strpos($line, "!") === 0)
            ) {
                continue;
            }

            // Add a new key-value pair or append value to a previous pair
            if (! $isWaitingOtherLine) {
                $key   = substr($line, 0, strpos($line, $delimiter));
                $value = substr($line, strpos($line, $delimiter) + $delimLength, strlen($line));
            } else {
                $value .= $line;
            }

            // Check if ends with single '\' (indicating another line is expected)
            if (strrpos($value, "\\") === strlen($value) - strlen("\\")) {
                $value              = substr($value, 0, -1);
                $isWaitingOtherLine = true;
            } else {
                $isWaitingOtherLine = false;
            }

            $key   = $this->trimWhitespace ? trim($key) : $key;
            $value = $this->trimWhitespace && ! $isWaitingOtherLine
                ? trim($value)
                : $value;

            $result[$key] = stripslashes($value);
            unset($lines[$i]);
        }

        return $result;
    }
}