Add comparison operators to KeyValue expression

Signed-off-by: davidarendsen <davidarendsen@hey.com>

src/Expression/KeyValue.php

@@ -2,32 +2,74 @@
 
 namespace Arendsen\FluxQueryBuilder\Expression;
 
+use Exception;
+
 class KeyValue extends Base {
 
+    const EQUAL_TO = '==';
+    const NOT_EQUAL_TO = '!=';
+    const GREATER_THAN = '>';
+    const GREATER_EQUAL_TO = '>=';
+    const LESS_THAN = '<';
+    const LESS_EQUAL_TO = '<=';
+    const EQUAL_TO_REGEX = '=~';
+    const NOT_EQUAL_TO_REGEX = '!~';
+
+    const COMPARISON_OPERATORS = [
+        self::EQUAL_TO,
+        self::NOT_EQUAL_TO,
+        self::GREATER_THAN,
+        self::GREATER_EQUAL_TO,
+        self::LESS_THAN,
+        self::LESS_EQUAL_TO,
+        self::EQUAL_TO_REGEX,
+        self::NOT_EQUAL_TO_REGEX,
+    ];
+
     /**
      * @var array $expressions
      */
     private $expressions;
 
-    public function __construct(string $key, string $value)
+    private function __construct(string $key, string $operator, string $value)
     {
-        $this->expressions[] = 'r.' . $key . ' == "' . $value . '"';
+        $this->checkOperator($operator);
+        $this->expressions[] = 'r.' . $key . ' ' . $operator . ' "' . $value . '"';
     }
 
-    public static function set(string $key, string $value): KeyValue
+    public static function set(string $key, string $operator, string $value): KeyValue
     {
-        return new self($key, $value);
+        return new self($key, $operator, $value);
     }
 
-    public function and(string $key, string $value): KeyValue
+    public static function setEquals(string $key, string $value): KeyValue
     {
-        $this->expressions[] = 'and r.' . $key . ' == "' . $value . '"';
+        return self::set($key, self::EQUAL_TO, $value);
+    }
+
+    public function and(string $key, string $operator, string $value): KeyValue
+    {
+        $this->checkOperator($operator);
+        $this->expressions[] = 'and r.' . $key . ' ' . $operator . ' "' . $value . '"';
         return $this;
     }
 
-    public function or(string $key, string $value): KeyValue
+    public function andEquals(string $key, string $value): KeyValue
     {
-        $this->expressions[] = 'or r.' . $key . ' == "' . $value . '"';
+        $this->and($key, '==', $value);
+        return $this;
+    }
+
+    public function or(string $key, string $operator, string $value): KeyValue
+    {
+        $this->checkOperator($operator);
+        $this->expressions[] = 'or r.' . $key . ' ' . $operator . ' "' . $value . '"';
+        return $this;
+    }
+
+    public function orEquals(string $key, string $value): KeyValue
+    {
+        $this->or($key, '==', $value);
         return $this;
     }
 
@@ -36,4 +78,12 @@ class KeyValue extends Base {
         return implode(' ', $this->expressions);
     }
 
+    protected function checkOperator(string $operator)
+    {
+        if(!in_array($operator, self::COMPARISON_OPERATORS))
+        {
+            throw new Exception('Operator "' . $operator . '" is not supported!');
+        }
+    }
+
 }

src/QueryBuilder.php

@@ -64,7 +64,7 @@ class QueryBuilder {
         $this->addRequiredData(self::REQUIRED_INPUT_MEASUREMENT, $measurement);
         $this->addToQueryArray(
             self::FLUX_PART_FILTERS,
-            new Filter(KeyValue::set('_measurement', $measurement))
+            new Filter(KeyValue::setEquals('_measurement', $measurement))
         );
         return $this;
     }

tests/Expression/KeyValueTest.php

@@ -8,15 +8,26 @@ final class KeyValueExpressionTest extends TestCase {
 
     public function testSimpleKeyvalue()
     {
-        $keyvalue = KeyValue::set('_measurement', 'test_measurement')
-            ->and('_field', 'user')
-            ->or('_field', 'field2')
-            ->and('user', 'my_username');
+        $keyvalue = KeyValue::setEquals('_measurement', 'test_measurement')
+            ->andEquals('_field', 'user')
+            ->or('count', '>=', '1')
+            ->and('user', '==', 'my_username')
+            ->orEquals('test', 'world');
 
         $query = 'r._measurement == "test_measurement" and r._field == "user" or ' . 
-            'r._field == "field2" and r.user == "my_username"';
+            'r.count >= "1" and r.user == "my_username" or r.test == "world"';
 
         $this->assertEquals($keyvalue->__toString(), $query);
     }
 
+    public function testInvalidOperator()
+    {
+        $this->expectException(Exception::class);
+
+        $keyvalue = KeyValue::set('_measurement', '9dkda9e', 'test_measurement')
+            ->andEquals('_field', 'user')
+            ->or('_field', '==', 'field2')
+            ->andEquals('user', 'my_username');
+    }
+
 }

tests/Function/FilterFunctionTest.php

@@ -9,10 +9,10 @@ final class FilterFunctionTest extends TestCase {
 
     public function testSimpleFilter()
     {
-        $expression = new Filter(KeyValue::set('_measurement', 'test_measurement')
-            ->and('_field', 'user')
-            ->or('_field', 'field2')
-            ->and('user', 'my_username')
+        $expression = new Filter(KeyValue::setEquals('_measurement', 'test_measurement')
+            ->andEquals('_field', 'user')
+            ->orEquals('_field', 'field2')
+            ->andEquals('user', 'my_username')
         );
 
         $query = '|> filter(fn: (r) => r._measurement == "test_measurement" and r._field == "user" or ' . 

tests/QueryBuilderTest.php

@@ -43,7 +43,7 @@ final class QueryBuilderTest extends TestCase {
                 ],
                 'test_measurement',
                 '-360h',
-                new KeyValue('user', 'username'),
+                KeyValue::setEquals('user', 'username'),
                 'from(bucket: "example_bucket") |> range(start: "-360h") |> filter(fn: (r) => r._measurement == "test_measurement") ' . 
                     '|> filter(fn: (r) => r.user == "username") '
             ],