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<?php |
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namespace Bmatovu\Ussd; |
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use Bmatovu\Ussd\Contracts\Tag; |
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use Illuminate\Contracts\Cache\Repository as CacheContract; |
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use Illuminate\Support\Facades\Log; |
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use Illuminate\Support\Str; |
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class Parser |
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{ |
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protected \DOMXPath $xpath; |
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protected CacheContract $cache; |
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protected string $prefix; |
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protected int $ttl; |
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public function __construct(\DOMXPath $xpath, string $exp, CacheContract $cache, string $prefix, string $session_id, ?int $ttl = null) |
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{ |
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$this->xpath = $xpath; |
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$this->cache = $cache; |
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$this->prefix = $prefix; |
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$this->ttl = $ttl; |
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$this->prepareCache($session_id, $exp); |
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} |
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public function parse(?string $answer): string |
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{ |
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$this->processResponse($answer); |
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$exp = $this->cache->get("{$this->prefix}_exp"); |
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$node = $this->xpath->query($exp)->item(0); |
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if (! $node) { |
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$this->setBreakpoint(); |
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} |
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$output = $this->renderNext(); |
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if (! $output) { |
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return $this->parse($answer); |
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} |
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return $output; |
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} |
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protected function prepareCache(string $session_id, string $exp) |
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{ |
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$preSessionId = $this->cache->get("{$this->prefix}_session_id"); |
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if ($preSessionId === $session_id) { |
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return; |
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} |
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if ('' !== $preSessionId) { |
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// $this->cache->tag($this->prefix)->flush(); |
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} |
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$this->cache->put("{$this->prefix}_session_id", $session_id, $this->ttl); |
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$this->cache->put("{$this->prefix}_pre", '', $this->ttl); |
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$this->cache->put("{$this->prefix}_exp", $exp, $this->ttl); |
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$this->cache->put("{$this->prefix}_breakpoints", '[]', $this->ttl); |
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} |
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protected function processResponse(?string $answer): void |
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{ |
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$pre = $this->cache->get("{$this->prefix}_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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// Log::debug("Process -->", ['tag' => $preNode->tagName, 'pre' => $pre]); |
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$tagName = Str::studly($preNode->tagName); |
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$tag = $this->createTag(__NAMESPACE__."\\Tags\\{$tagName}Tag", [$preNode, $this->cache, $this->prefix, $this->ttl]); |
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$tag->process($answer); |
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} |
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protected function setBreakpoint(): void |
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{ |
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// Log::debug("Error -->", ['tag' => '', 'exp' => $exp]); |
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$exp = $this->cache->get("{$this->prefix}_exp"); |
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$breakpoints = (array) json_decode((string) $this->cache->get("{$this->prefix}_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->cache->put("{$this->prefix}_exp", $breakpoint[$exp], $this->ttl); |
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$this->cache->put("{$this->prefix}_breakpoints", json_encode($breakpoints), $this->ttl); |
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} |
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protected function renderNext(): ?string |
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{ |
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// Log::debug("Handle -->", ['tag' => $node->tagName, 'exp' => $exp]); |
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$exp = $this->cache->get("{$this->prefix}_exp"); |
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$node = $this->xpath->query($exp)->item(0); |
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$tagName = Str::studly($node->tagName); |
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$tag = $this->createTag(__NAMESPACE__."\\Tags\\{$tagName}Tag", [$node, $this->cache, $this->prefix, $this->ttl]); |
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$output = $tag->handle(); |
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$exp = $this->cache->get("{$this->prefix}_exp"); |
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$breakpoints = (array) json_decode((string) $this->cache->get("{$this->prefix}_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->cache->put("{$this->prefix}_exp", $breakpoint[$exp], $this->ttl); |
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$this->cache->put("{$this->prefix}_breakpoints", json_encode($breakpoints), $this->ttl); |
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} |
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return $output; |
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} |
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protected function createTag(string $fqcn, array $args = []): Tag |
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{ |
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if (! class_exists($fqcn)) { |
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throw new \Exception("Missing class: {$fqcn}"); |
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} |
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return \call_user_func_array([new \ReflectionClass($fqcn), 'newInstance'], $args); |
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} |
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} |
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mtvbrianking /
laravel-ussd
Loading history...
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.