Allow for missing headers

src/Reader.php

@@ -58,8 +58,10 @@ public function collect(): LazyCollection
 						$data_columns = count($data);
 
 						if ($columns < $data_columns) {
-							// TODO: Offer option to trim
-							throw new UnexpectedValueException("Expected {$columns} columns of data but got {$data_columns}");
+							foreach (range(1, $data_columns) as $index => $column) {
+								$keys[$index] ??= "column{$column}";
+							}
+							$columns = count($keys);
 						}
 
 						if ($columns > $data_columns) {

tests/Feature/CsvReaderTest.php

@@ -30,4 +30,16 @@ public function test_it_can_read_a_basic_csv_file_as_a_collection(): void
 			}, $row->toArray());
 		}
 	}
+
+	public function test_if_headers_are_missing_column_numbers_are_used_as_keys(): void
+	{
+		$collection = CsvReader::from($this->fixture('more-columns-than-headers.csv'))->collect();
+
+		foreach ($collection as $index => $row) {
+			$this->assertSame(match ($index) {
+				0 => ['user_id' => 1, 'name' => 'Chris', 'column3' => null, 'column4' => 40.2, 'column5' => null, 'column6' => null, 'column7' => null],
+				1 => ['user_id' => 10, 'name' => 'Bogdan', 'column3' => 'not null', 'column4' => -37, 'column5' => null, 'column6' => null, 'column7' => null],
+			}, $row->toArray());
+		}
+	}
 }

tests/fixtures/more-columns-than-headers.csv

@@ -0,0 +1,3 @@
+User ID,Name
+1,Chris,,40.2,,,
+10,Bogdan,"not null",-37