<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\String;

use Symfony\Component\String\Exception\ExceptionInterface;
use Symfony\Component\String\Exception\InvalidArgumentException;
use Symfony\Component\String\Exception\RuntimeException;

/**
 * Represents a binary-safe string of bytes.
 *
 * @author Nicolas Grekas <p@tchwork.com>
 * @author Hugo Hamon <hugohamon@neuf.fr>
 *
 * @throws ExceptionInterface
 */
class ByteString extends AbstractString
{
    private const ALPHABET_ALPHANUMERIC = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz';

    public function __construct(string $string = '')
    {
        $this->string = $string;
    }

    /*
     * The following method was derived from code of the Hack Standard Library (v4.40 - 2020-05-03)
     *
     * https://github.com/hhvm/hsl/blob/80a42c02f036f72a42f0415e80d6b847f4bf62d5/src/random/private.php#L16
     *
     * Code subject to the MIT license (https://github.com/hhvm/hsl/blob/master/LICENSE).
     *
     * Copyright (c) 2004-2020, Facebook, Inc. (https://www.facebook.com/)
     */

    public static function fromRandom(int $length = 16, string $alphabet = null): self
    {
        if ($length <= 0) {
            throw new InvalidArgumentException(sprintf('A strictly positive length is expected, "%d" given.', $length));
        }

        $alphabet = $alphabet ?? self::ALPHABET_ALPHANUMERIC;
        $alphabetSize = \strlen($alphabet);
        $bits = (int) ceil(log($alphabetSize, 2.0));
        if ($bits <= 0 || $bits > 56) {
            throw new InvalidArgumentException('The length of the alphabet must in the [2^1, 2^56] range.');
        }

        $ret = '';
        while ($length > 0) {
            $urandomLength = (int) ceil(2 * $length * $bits / 8.0);
            $data = random_bytes($urandomLength);
            $unpackedData = 0;
            $unpackedBits = 0;
            for ($i = 0; $i < $urandomLength && $length > 0; ++$i) {
                // Unpack 8 bits
                $unpackedData = ($unpackedData << 8) | \ord($data[$i]);
                $unpackedBits += 8;

                // While we have enough bits to select a character from the alphabet, keep
                // consuming the random data
                for (; $unpackedBits >= $bits && $length > 0; $unpackedBits -= $bits) {
                    $index = ($unpackedData & ((1 << $bits) - 1));
                    $unpackedData >>= $bits;
                    // Unfortunately, the alphabet size is not necessarily a power of two.
                    // Worst case, it is 2^k + 1, which means we need (k+1) bits and we
                    // have around a 50% chance of missing as k gets larger
                    if ($index < $alphabetSize) {
                        $ret .= $alphabet[$index];
                        --$length;
                    }
                }
            }
        }

        return new static($ret);
    }

    public function bytesAt(int $offset): array
    {
        $str = $this->string[$offset] ?? '';

        return '' === $str ? [] : [\ord($str)];
    }

    public function append(string ...$suffix): static
    {
        $str = clone $this;
        $str->string .= 1 >= \count($suffix) ? ($suffix[0] ?? '') : implode('', $suffix);

        return $str;
    }

    public function camel(): static
    {
        $str = clone $this;

        $parts = explode(' ', trim(ucwords(preg_replace('/[^a-zA-Z0-9\x7f-\xff]++/', ' ', $this->string))));
        $parts[0] = 1 !== \strlen($parts[0]) && ctype_upper($parts[0]) ? $parts[0] : lcfirst($parts[0]);
        $str->string = implode('', $parts);

        return $str;
    }

    public function chunk(int $length = 1): array
    {
        if (1 > $length) {
            throw new InvalidArgumentException('The chunk length must be greater than zero.');
        }

        if ('' === $this->string) {
            return [];
        }

        $str = clone $this;
        $chunks = [];

        foreach (str_split($this->string, $length) as $chunk) {
            $str->string = $chunk;
            $chunks[] = clone $str;
        }

        return $chunks;
    }

    public function endsWith(string|iterable|AbstractString $suffix): bool
    {
        if ($suffix instanceof AbstractString) {
            $suffix = $suffix->string;
        } elseif (!\is_string($suffix)) {
            return parent::endsWith($suffix);
        }

        return '' !== $suffix && \strlen($this->string) >= \strlen($suffix) && 0 === substr_compare($this->string, $suffix, -\strlen($suffix), null, $this->ignoreCase);
    }

    public function equalsTo(string|iterable|AbstractString $string): bool
    {
        if ($string instanceof AbstractString) {
            $string = $string->string;
        } elseif (!\is_string($string)) {
            return parent::equalsTo($string);
        }

        if ('' !== $string && $this->ignoreCase) {
            return 0 === strcasecmp($string, $this->string);
        }

        return $string === $this->string;
    }

    public function folded(): static
    {
        $str = clone $this;
        $str->string = strtolower($str->string);

        return $str;
    }

    public function indexOf(string|iterable|AbstractString $needle, int $offset = 0): ?int
    {
        if ($needle instanceof AbstractString) {
            $needle = $needle->string;
        } elseif (!\is_string($needle)) {
            return parent::indexOf($needle, $offset);
        }

        if ('' === $needle) {
            return null;
        }

        $i = $this->ignoreCase ? stripos($this->string, $needle, $offset) : strpos($this->string, $needle, $offset);

        return false === $i ? null : $i;
    }

    public function indexOfLast(string|iterable|AbstractString $needle, int $offset = 0): ?int
    {
        if ($needle instanceof AbstractString) {
            $needle = $needle->string;
        } elseif (!\is_string($needle)) {
            return parent::indexOfLast($needle, $offset);
        }

        if ('' === $needle) {
            return null;
        }

        $i = $this->ignoreCase ? strripos($this->string, $needle, $offset) : strrpos($this->string, $needle, $offset);

        return false === $i ? null : $i;
    }

    public function isUtf8(): bool
    {
        return '' === $this->string || preg_match('//u', $this->string);
    }

    public function join(array $strings, string $lastGlue = null): static
    {
        $str = clone $this;

        $tail = null !== $lastGlue && 1 < \count($strings) ? $lastGlue.array_pop($strings) : '';
        $str->string = implode($this->string, $strings).$tail;

        return $str;
    }

    public function length(): int
    {
        return \strlen($this->string);
    }

    public function lower(): static
    {
        $str = clone $this;
        $str->string = strtolower($str->string);

        return $str;
    }

    public function match(string $regexp, int $flags = 0, int $offset = 0): array
    {
        $match = ((\PREG_PATTERN_ORDER | \PREG_SET_ORDER) & $flags) ? 'preg_match_all' : 'preg_match';

        if ($this->ignoreCase) {
            $regexp .= 'i';
        }

        set_error_handler(static function ($t, $m) { throw new InvalidArgumentException($m); });

        try {
            if (false === $match($regexp, $this->string, $matches, $flags | \PREG_UNMATCHED_AS_NULL, $offset)) {
                $lastError = preg_last_error();

                foreach (get_defined_constants(true)['pcre'] as $k => $v) {
                    if ($lastError === $v && '_ERROR' === substr($k, -6)) {
                        throw new RuntimeException('Matching failed with '.$k.'.');
                    }
                }

                throw new RuntimeException('Matching failed with unknown error code.');
            }
        } finally {
            restore_error_handler();
        }

        return $matches;
    }

    public function padBoth(int $length, string $padStr = ' '): static
    {
        $str = clone $this;
        $str->string = str_pad($this->string, $length, $padStr, \STR_PAD_BOTH);

        return $str;
    }

    public function padEnd(int $length, string $padStr = ' '): static
    {
        $str = clone $this;
        $str->string = str_pad($this->string, $length, $padStr, \STR_PAD_RIGHT);

        return $str;
    }

    public function padStart(int $length, string $padStr = ' '): static
    {
        $str = clone $this;
        $str->string = str_pad($this->string, $length, $padStr, \STR_PAD_LEFT);

        return $str;
    }

    public function prepend(string ...$prefix): static
    {
        $str = clone $this;
        $str->string = (1 >= \count($prefix) ? ($prefix[0] ?? '') : implode('', $prefix)).$str->string;

        return $str;
    }

    public function replace(string $from, string $to): static
    {
        $str = clone $this;

        if ('' !== $from) {
            $str->string = $this->ignoreCase ? str_ireplace($from, $to, $this->string) : str_replace($from, $to, $this->string);
        }

        return $str;
    }

    public function replaceMatches(string $fromRegexp, string|callable $to): static
    {
        if ($this->ignoreCase) {
            $fromRegexp .= 'i';
        }

        $replace = \is_array($to) || $to instanceof \Closure ? 'preg_replace_callback' : 'preg_replace';

        set_error_handler(static function ($t, $m) { throw new InvalidArgumentException($m); });

        try {
            if (null === $string = $replace($fromRegexp, $to, $this->string)) {
                $lastError = preg_last_error();

                foreach (get_defined_constants(true)['pcre'] as $k => $v) {
                    if ($lastError === $v && '_ERROR' === substr($k, -6)) {
                        throw new RuntimeException('Matching failed with '.$k.'.');
                    }
                }

                throw new RuntimeException('Matching failed with unknown error code.');
            }
        } finally {
            restore_error_handler();
        }

        $str = clone $this;
        $str->string = $string;

        return $str;
    }

    public function reverse(): static
    {
        $str = clone $this;
        $str->string = strrev($str->string);

        return $str;
    }

    public function slice(int $start = 0, int $length = null): static
    {
        $str = clone $this;
        $str->string = (string) substr($this->string, $start, $length ?? \PHP_INT_MAX);

        return $str;
    }

    public function snake(): static
    {
        $str = $this->camel();
        $str->string = strtolower(preg_replace(['/([A-Z]+)([A-Z][a-z])/', '/([a-z\d])([A-Z])/'], '\1_\2', $str->string));

        return $str;
    }

    public function splice(string $replacement, int $start = 0, int $length = null): static
    {
        $str = clone $this;
        $str->string = substr_replace($this->string, $replacement, $start, $length ?? \PHP_INT_MAX);

        return $str;
    }

    public function split(string $delimiter, int $limit = null, int $flags = null): array
    {
        if (1 > $limit = $limit ?? \PHP_INT_MAX) {
            throw new InvalidArgumentException('Split limit must be a positive integer.');
        }

        if ('' === $delimiter) {
            throw new InvalidArgumentException('Split delimiter is empty.');
        }

        if (null !== $flags) {
            return parent::split($delimiter, $limit, $flags);
        }

        $str = clone $this;
        $chunks = $this->ignoreCase
            ? preg_split('{'.preg_quote($delimiter).'}iD', $this->string, $limit)
            : explode($delimiter, $this->string, $limit);

        foreach ($chunks as &$chunk) {
            $str->string = $chunk;
            $chunk = clone $str;
        }

        return $chunks;
    }

    public function startsWith(string|iterable|AbstractString $prefix): bool
    {
        if ($prefix instanceof AbstractString) {
            $prefix = $prefix->string;
        } elseif (!\is_string($prefix)) {
            return parent::startsWith($prefix);
        }

        return '' !== $prefix && 0 === ($this->ignoreCase ? strncasecmp($this->string, $prefix, \strlen($prefix)) : strncmp($this->string, $prefix, \strlen($prefix)));
    }

    public function title(bool $allWords = false): static
    {
        $str = clone $this;
        $str->string = $allWords ? ucwords($str->string) : ucfirst($str->string);

        return $str;
    }

    public function toUnicodeString(string $fromEncoding = null): UnicodeString
    {
        return new UnicodeString($this->toCodePointString($fromEncoding)->string);
    }

    public function toCodePointString(string $fromEncoding = null): CodePointString
    {
        $u = new CodePointString();

        if (\in_array($fromEncoding, [null, 'utf8', 'utf-8', 'UTF8', 'UTF-8'], true) && preg_match('//u', $this->string)) {
            $u->string = $this->string;

            return $u;
        }

        set_error_handler(static function ($t, $m) { throw new InvalidArgumentException($m); });

        try {
            try {
                $validEncoding = false !== mb_detect_encoding($this->string, $fromEncoding ?? 'Windows-1252', true);
            } catch (InvalidArgumentException $e) {
                if (!\function_exists('iconv')) {
                    throw $e;
                }

                $u->string = iconv($fromEncoding ?? 'Windows-1252', 'UTF-8', $this->string);

                return $u;
            }
        } finally {
            restore_error_handler();
        }

        if (!$validEncoding) {
            throw new InvalidArgumentException(sprintf('Invalid "%s" string.', $fromEncoding ?? 'Windows-1252'));
        }

        $u->string = mb_convert_encoding($this->string, 'UTF-8', $fromEncoding ?? 'Windows-1252');

        return $u;
    }

    public function trim(string $chars = " \t\n\r\0\x0B\x0C"): static
    {
        $str = clone $this;
        $str->string = trim($str->string, $chars);

        return $str;
    }

    public function trimEnd(string $chars = " \t\n\r\0\x0B\x0C"): static
    {
        $str = clone $this;
        $str->string = rtrim($str->string, $chars);

        return $str;
    }

    public function trimStart(string $chars = " \t\n\r\0\x0B\x0C"): static
    {
        $str = clone $this;
        $str->string = ltrim($str->string, $chars);

        return $str;
    }

    public function upper(): static
    {
        $str = clone $this;
        $str->string = strtoupper($str->string);

        return $str;
    }

    public function width(bool $ignoreAnsiDecoration = true): int
    {
        $string = preg_match('//u', $this->string) ? $this->string : preg_replace('/[\x80-\xFF]/', '?', $this->string);

        return (new CodePointString($string))->width($ignoreAnsiDecoration);
    }
}

• [D] Exception
• [D] Inflector
• [D] Resources
• [D] Slugger
• [F] AbstractString.php
  Delete
• [F] AbstractUnicodeString.php
  Delete
• [F] ByteString.php
  Delete
• [F] CHANGELOG.md
  Delete
• [F] CodePointString.php
  Delete
• [F] composer.json
  Delete
• [F] LazyString.php
  Delete
• [F] LICENSE
  Delete
• [F] README.md
  Delete
• [F] UnicodeString.php
  Delete

Categories

• Blog 1
• Payment 1
• Competitive Research 1
• Information Technology 0

Recent Posts

Mar 27, 2024

Enhancing Payment Security: The Role...

Mar 27, 2024

The Rise of Contactless Payments:...

The Future of Digital Wallets: How Mobile Payments are Shaping the Financial Landscape

Digital wallets have fundamentally transformed how we manage money, offering a streamlined, secure, and highly efficient method for handling payments and transactions. By consolidating credit, debit, and loyalty card information into a single app, digital wallets simplify the payment process and eliminate the need for physical cards, enhancing both convenience and security.
As digital wallets evolve, they are integrating advanced features that push the boundaries of traditional payment methods. Biometric authentication, such as fingerprint and facial recognition, adds an extra layer of security, ensuring that only authorized users can access their payment information. Real-time transaction alerts provide instant notifications for every transaction, allowing users to monitor their spending and detect any unauthorized activity swiftly. Budgeting tools within digital wallets offer personalized insights and financial management capabilities, helping users track their expenses and plan their budgets more effectively.
The growing adoption of digital wallets is fueled by their ease of use and the increasing demand for contactless payment solutions. As technology advances, digital wallets are likely to incorporate even more innovative features, such as artificial intelligence for personalized financial advice, integrated loyalty programs for seamless rewards management, and cross-border transaction capabilities for global shopping convenience.
The integration of these features is reshaping the financial landscape by making transactions not only faster but also more secure and user-friendly. The future of digital wallets is set to further revolutionize how we handle our finances, offering an all-encompassing solution that caters to the evolving needs of modern consumers. As digital wallets continue to advance, they will play an increasingly central role in shaping the future of financial interactions, driving the global shift towards a more digital and cashless economy.

Tags

• blog