exussum12

app/Parser.php

@@ -3,11 +3,88 @@
 namespace App;
 
 use Exception;
+use function gc_disable;
+use function fopen;
+use function stream_set_read_buffer;
+use function fgets;
+use function substr;
+use function strpos;
+use function ksort;
+use function str_replace;
+use function file_put_contents;
 
 final class Parser
 {
+		private const READ_FILE_SIZE = 16777216; # 16MB
+
+		private const PREFIX_LENGTH = 19;
+		private const SUFFIX_LENGTH = -16;
     public function parse(string $inputPath, string $outputPath): void
     {
-        throw new Exception('TODO');
+				// gc? where we're going we dont need gc
+        gc_disable();
+
+        $handle = fopen($inputPath, 'r');
+        if (! $handle) {
+            throw new Exception("Could not open file at $inputPath");
+        }
+
+        stream_set_read_buffer($handle, self::READ_FILE_SIZE);
+
+        $flatData = [];
+
+				$prefix = self::PREFIX_LENGTH;
+				$suffix = self::SUFFIX_LENGTH;
+
+        while (($line = fgets($handle)) !== false) {
+            $key = substr($line, $prefix, $suffix);
+            $flatData[$key] = ($flatData[$key] ?? 0) + 1;
+        }
+
+        fclose($handle);
+
+        ksort($flatData, SORT_STRING);
+
+        $json = "{\n";
+        $currentUrl = null;
+        $firstUrl = true;
+        $firstDate = true;
+
+        foreach ($flatData as $key => $count) {
+            $commaPos = strpos($key, ',');
+            $url = substr($key, 0, $commaPos);
+            $date = substr($key, $commaPos + 1);
+
+            if ($url !== $currentUrl) {
+                if ($currentUrl !== null) {
+                    $json .= "\n    }";
+                }
+
+                if (!$firstUrl) {
+                    $json .= ",\n";
+                }
+
+                $escapedUrl = str_replace('/', '\/', $url);
+                $json .= '    "' . $escapedUrl . '": {';
+
+                $currentUrl = $url;
+                $firstUrl = false;
+                $firstDate = true;
+            }
+
+            if (!$firstDate) {
+                $json .= ',';
+            }
+            $json .= "\n" . '        "' . $date . '": ' . $count;
+            $firstDate = false;
+        }
+
+        if ($currentUrl !== null) {
+            $json .= "\n    }\n}";
+        } else {
+            $json .= "\n}";
+        }
+
+        file_put_contents($outputPath, $json);
     }
-}
+}