parent
3bf9b68503
commit
1037f438ce
GPG Key ID:
2C5FD5035250423D
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<?php |
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namespace App\Tables; |
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use App\Models\Table; |
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/** |
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* Table exporter base class |
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*/ |
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abstract class BaseExporter |
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{ |
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/** |
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* @var Table the table to export |
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*/ |
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protected $table; |
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/** |
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* @var Column[] - parsed columns for the table |
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*/ |
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protected $columns; |
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/** |
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* @var bool - true if user wants download; can e.g. change mime type to text/plain if not |
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*/ |
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protected $wantDownload; |
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/** |
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* TODO export options from enabled columns, sorts, etc |
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* |
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* @param Table $table |
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*/ |
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public function __construct(Table $table) |
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{ |
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$this->table = $table; |
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$this->columns = Column::columnsFromJson($table->revision->columns); |
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} |
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/** |
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* @return string - mime type for the downloaded file |
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*/ |
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protected abstract function getMimeType(); |
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/** |
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* @return string - file extension for the downloaded file |
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*/ |
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protected abstract function getFileExtension(); |
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/** |
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* @return string - file name without extension, by default the table name |
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*/ |
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protected function getFileBasename() |
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{ |
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return $this->table->name; |
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} |
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/** |
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* Generate a response that appears as a file download to the browser |
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* |
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* @param bool $download - force download, otherwise the browser may show it in the window |
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*/ |
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public function exportToBrowser($download = true) |
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{ |
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$this->wantDownload = $download; |
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$mimeType = $this->getMimeType(); |
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$filename = $this->getFileBasename() . '.' . $this->getFileExtension(); |
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ob_end_clean(); |
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// Redirect output to a client’s web browser |
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header("Content-Type: $mimeType; charset=utf-8"); |
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if ($download) { |
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header("Content-Disposition: attachment;filename=\"$filename\""); |
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} |
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// Cache headers |
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header('Cache-Control: max-age=0'); |
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// IE9 |
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header('Cache-Control: max-age=1'); |
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// Other IE headers |
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header('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); // Date in the past |
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header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT'); // always modified |
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header('Cache-Control: cache, must-revalidate'); // HTTP/1.1 |
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header('Pragma: no-cache'); // HTTP/1.0 |
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$this->writeDocument(); |
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exit; |
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} |
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/** |
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* Generator that produces PHP arrays for all rows, fetched from the DB in given chunks. |
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* |
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* @param int $chunkSize - size of one chunk |
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* @return \Generator|array[] |
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*/ |
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protected function iterateRows($chunkSize = 1000) |
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{ |
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$revision = $this->table->revision; |
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$count = $revision->rows()->count(); |
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$start = 0; |
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while ($start < $count) { |
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$rows = $revision->rows()->offset($start)->limit($chunkSize)->get(); |
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foreach ($rows as $row) { |
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$data = json_decode($row->data); |
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// column renaming, value formatting... |
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yield $data; |
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} |
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$start += $chunkSize; |
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} |
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} |
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/** |
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* Write the document to stdout ('php://output') |
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*/ |
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protected abstract function writeDocument(); |
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} |
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<?php |
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namespace App\Tables; |
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class CStructArrayExporter extends BaseExporter |
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{ |
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/** |
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* @return string - mime type for the downloaded file |
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*/ |
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protected function getMimeType() |
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{ |
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return $this->wantDownload ? 'text/x-csrc' : 'text/plain'; |
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} |
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/** |
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* @return string - file extension for the downloaded file |
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*/ |
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protected function getFileExtension() |
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{ |
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return 'c'; |
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} |
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private function cify($name) |
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{ |
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$name = preg_replace('/[^a-z0-9_]/i', '_', $name); |
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if (ctype_digit($name[0])) { |
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$name = '_' . $name; |
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} |
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return $name; |
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} |
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/** |
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* Write the document to stdout ('php://output') |
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*/ |
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protected function writeDocument() |
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{ |
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$fields = array_map(function (Column $c) { |
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$type = $c->type; |
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if ($type == 'string') { |
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$type = 'const char *'; |
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} |
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$name = $this->cify($c->name); |
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return (object)['name' => $c->name, 'type' => $c->type, 'ctype' => $type, 'cname' => $name]; |
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}, $this->columns); |
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$ctablename = $this->cify($this->table->name); |
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// preamble |
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echo "#include <stdbool.h>\n\n"; |
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echo "struct " . $ctablename . " {\n"; |
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foreach ($fields as $field) { |
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echo " " . $field->ctype . " " . $field->cname . ";\n"; |
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} |
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echo "};\n\n"; |
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// Now the table itself |
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echo "const struct ".$ctablename.' tbl_'.$ctablename."[] = {\n"; |
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$first = true; |
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foreach ($this->iterateRows() as $row) { |
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if ($first) { |
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$first = false; |
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} else { |
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echo ",\n"; |
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} |
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echo " {"; |
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$firstf = true; |
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foreach ($fields as $field) { |
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if ($firstf) { |
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$firstf = false; |
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} else { |
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echo ", "; |
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} |
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$val = 0; |
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switch ($field->type) { |
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case 'string': |
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$val = ""; |
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break; |
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case 'bool': |
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$val = false; |
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break; |
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} |
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if (isset($row->{$field->name})) { |
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$val = $row->{$field->name}; |
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} |
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// export to C format |
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switch ($field->type) { |
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case 'string': |
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echo '"' . addcslashes($val, "\0..\37!@\@\177..\377") . '"'; |
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break; |
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case 'bool': |
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echo (int)$val; |
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break; |
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case 'int': |
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case 'float': |
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echo $val; |
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break; |
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} |
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} |
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echo "}"; |
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} |
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echo "\n};\n"; |
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} |
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} |
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@ -0,0 +1,52 @@ |
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<?php |
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namespace App\Tables; |
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class CsvExporter extends BaseExporter |
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{ |
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/** |
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* @return string - mime type for the downloaded file |
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*/ |
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protected function getMimeType() |
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{ |
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return $this->wantDownload ? 'text/csv' : 'text/plain'; |
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} |
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/** |
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* @return string - file extension for the downloaded file |
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*/ |
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protected function getFileExtension() |
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{ |
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return 'csv'; |
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} |
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/** |
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* Write the document to stdout ('php://output') |
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*/ |
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protected function writeDocument() |
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{ |
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$handle = fopen('php://output', 'w'); |
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$columnNames = array_map(function (Column $c) { |
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return $c->title; |
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}, $this->columns); |
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fputcsv($handle, $columnNames); |
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foreach ($this->iterateRows() as $row) { |
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$items = []; |
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foreach ($this->columns as $column) { |
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if (isset($row->{$column->name})) { |
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$items[] = $row->{$column->name}; |
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} else { |
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$items[] = null; |
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} |
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} |
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fputcsv($handle, $items); |
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} |
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fclose($handle); |
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} |
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} |
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<?php |
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namespace App\Tables; |
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class JsonExporter extends BaseExporter |
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{ |
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/** |
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* @return string - mime type for the downloaded file |
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*/ |
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protected function getMimeType() |
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{ |
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return 'application/json'; |
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} |
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/** |
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* @return string - file extension for the downloaded file |
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*/ |
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protected function getFileExtension() |
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{ |
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return 'json'; |
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} |
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/** |
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* Write the document to stdout ('php://output') |
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*/ |
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protected function writeDocument() |
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{ |
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echo "[\n"; |
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$first = true; |
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foreach ($this->iterateRows() as $row) { |
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if ($first) { |
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$first = false; |
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} else { |
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echo ",\n"; |
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} |
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echo json_encode($row, JSON_UNESCAPED_UNICODE|JSON_UNESCAPED_SLASHES); |
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} |
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echo "\n]\n"; |
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} |
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} |
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<b>Export presets:</b> |
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<ul class="mt-2"> |
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@foreach([ |
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'json' => 'JSON array of objects', |
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'csv' => 'CSV table', |
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'c' => 'C structs array', |
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] as $type => $title) |
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<li><a href="{{ route('table.export', [ |
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'user' => $table->owner->name, |
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'table' => $table->name, |
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'format' => $type |
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]) }}">{{ $title }}</a> – <a href="{{ route('table.export', [ |
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'user' => $table->owner->name, |
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'table' => $table->name, |
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'format' => $type, |
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'dl' => 1 |
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]) }}">@icon(fa-download px-1, Download)</a> |
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@endforeach |
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</ul> |
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