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<?php |
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namespace Bmatovu\Ussd; |
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use Bmatovu\Ussd\Contracts\AnswerableTag; |
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use Bmatovu\Ussd\Traits\Utilities; |
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use Illuminate\Container\Container; |
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use Illuminate\Contracts\Config\Repository as ConfigRepository; |
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class Ussd |
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{ |
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use Utilities; |
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protected \DOMXPath $xpath; |
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protected string $sessionId; |
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protected Store $store; |
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protected bool $newSession = false; |
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/** |
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* @param \DOMXPath|string $menu |
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*/ |
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public function __construct($menu, string $sessionId) |
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{ |
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$this->xpath = $menu instanceof \DOMXPath ? $menu : $this->fileToXpath($menu); |
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$config = Container::getInstance()->make(ConfigRepository::class); |
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$store = $config->get('ussd.cache.store', 'file'); |
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$ttl = $config->get('ussd.cache.ttl', 120); |
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$this->store = new Store($store, $ttl, $sessionId); |
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if ($this->sessionExists($sessionId)) { |
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return; |
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} |
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$this->newSession = true; |
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$this->store->put('_session_id', $sessionId); |
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$this->store->put('_answer', ''); |
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$this->store->put('_pre', ''); |
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$this->store->put('_exp', '/menu/*[1]'); |
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$this->store->put('_breakpoints', '[]'); |
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} |
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/** |
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* @param \DOMXPath|string $menu |
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*/ |
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public static function make($menu, string $sessionId): self |
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{ |
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return new static($menu, $sessionId); |
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} |
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public static function new(...$args): self |
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{ |
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return new static(...$args); |
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} |
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public function entry(string $expression): self |
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{ |
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if ($this->newSession) { |
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$this->store->put('_exp', $expression); |
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} |
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return $this; |
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} |
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public function save(array $options): self |
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{ |
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foreach ($options as $key => $value) { |
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$this->store->put($key, $value); |
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} |
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return $this; |
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} |
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public function handle(?string $userInput = ''): string |
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{ |
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$answer = $this->getAnswer($userInput); |
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if ($this->newSession) { |
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$inquiry = $this->doParse(); |
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if (!$answer) { |
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return $inquiry; |
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} |
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} |
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$answers = explode('*', $answer); |
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foreach ($answers as $answer) { |
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$inquiry = $this->doParse($answer); |
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} |
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return $inquiry; |
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} |
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protected function doParse(?string $answer = ''): ?string |
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{ |
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$this->doProcess($answer); |
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$exp = $this->store->get('_exp'); |
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$node = $this->xpath->query($exp)->item(0); |
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if (!$node) { |
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$this->doBreak(); |
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} |
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$inquiry = $this->doRender(); |
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if (!$inquiry) { |
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return $this->doParse($answer); |
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} |
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return $inquiry; |
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} |
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protected function doProcess(?string $answer): void |
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{ |
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$pre = $this->store->get('_pre'); |
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if (!$pre) { |
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return; |
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} |
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$preNode = $this->xpath->query($pre)->item(0); |
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$tagName = $this->resolveTagName($preNode); |
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$tag = $this->instantiateTag($tagName, [$preNode, $this->store]); |
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if (!$tag instanceof AnswerableTag) { |
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return; |
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} |
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$tag->process($answer); |
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} |
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protected function doBreak(): void |
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{ |
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$exp = $this->store->get('_exp'); |
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$breakpoints = (array) json_decode((string) $this->store->get('_breakpoints'), true); |
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if (!$breakpoints || !isset($breakpoints[0][$exp])) { |
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throw new \Exception('Missing tag'); |
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} |
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$breakpoint = array_shift($breakpoints); |
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$this->store->put('_exp', $breakpoint[$exp]); |
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$this->store->put('_breakpoints', json_encode($breakpoints)); |
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} |
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protected function doRender(): ?string |
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{ |
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$exp = $this->store->get('_exp'); |
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$node = $this->xpath->query($exp)->item(0); |
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$tagName = $this->resolveTagName($node); |
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$tag = $this->instantiateTag($tagName, [$node, $this->store]); |
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$inquiry = $tag->handle(); |
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$exp = $this->store->get('_exp'); |
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$breakpoints = (array) json_decode((string) $this->store->get('_breakpoints'), true); |
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if ($breakpoints && isset($breakpoints[0][$exp])) { |
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$breakpoint = array_shift($breakpoints); |
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$this->store->put('_exp', $breakpoint[$exp]); |
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$this->store->put('_breakpoints', json_encode($breakpoints)); |
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} |
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return $inquiry; |
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} |
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} |
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mtvbrianking /
laravel-ussd
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