Add Range node generator and tests

lib/Languages/Galach/Generators/Native/Range.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace QueryTranslator\Languages\Galach\Generators\Native;
+
+use LogicException;
+use QueryTranslator\Languages\Galach\Generators\Common\Visitor;
+use QueryTranslator\Languages\Galach\Values\Node\Term;
+use QueryTranslator\Languages\Galach\Values\Token\Range as RangeToken;
+use QueryTranslator\Values\Node;
+
+/**
+ * Range Node Visitor implementation.
+ */
+final class Range extends Visitor
+{
+    public function accept(Node $node)
+    {
+        return $node instanceof Term && $node->token instanceof RangeToken;
+    }
+
+    public function visit(Node $node, Visitor $subVisitor = null, $options = null)
+    {
+        if (!$node instanceof Term) {
+            throw new LogicException(
+                'Implementation accepts instance of Term Node'
+            );
+        }
+
+        $token = $node->token;
+
+        if (!$token instanceof RangeToken) {
+            throw new LogicException(
+                'Implementation accepts instance of Range Token'
+            );
+        }
+
+        $domainPrefix = '' === $token->domain ? '' : "{$token->domain}:";
+
+        switch ($token->type) {
+            case RangeToken::TYPE_INCLUSIVE:
+                return $domainPrefix . '[' . $token->rangeFrom . ' TO ' . $token->rangeTo . ']';
+
+            case RangeToken::TYPE_EXCLUSIVE:
+                return $domainPrefix . '{' . $token->rangeFrom . ' TO ' . $token->rangeTo . '}';
+
+            default:
+                throw new LogicException(sprintf('Range type %s is not supported', $token->type));
+        }
+    }
+}

tests/Galach/Generators/Native/RangeTest.php

@@ -0,0 +1,69 @@
+<?php
+
+namespace QueryTranslator\Tests\Galach\Generators\Native;
+
+use PHPUnit\Framework\TestCase;
+use QueryTranslator\Languages\Galach\Generators\Common\Visitor;
+use QueryTranslator\Languages\Galach\Generators\Native\Range;
+use QueryTranslator\Languages\Galach\Values\Node\Term;
+use QueryTranslator\Languages\Galach\Values\Token\Range as RangeToken;
+use QueryTranslator\Languages\Galach\Values\Token\Word;
+use QueryTranslator\Values\Node;
+
+class RangeTest extends TestCase
+{
+    /**
+     * @var Visitor
+     */
+    public $visitor;
+
+    protected function setUp()
+    {
+        $this->visitor = new Range();
+    }
+
+    public function acceptDataprovider()
+    {
+        return [
+            [true, new Term(new RangeToken('[a TO b]', 0, '', 'a', 'b', 'inclusive'))],
+            [false, new Term(new Word('word', 0, '', 'a'))],
+        ];
+    }
+
+    /**
+     * @param bool $expected
+     * @param Node $token
+     *
+     * @dataProvider acceptDataprovider
+     */
+    public function testAccepts($expected, $node)
+    {
+        $this->assertSame($expected, $this->visitor->accept($node));
+    }
+
+    public function visitDataprovider()
+    {
+        return [
+            ['[a TO b]', new Term(new RangeToken('[a TO b]', 0, '', 'a', 'b', 'inclusive'))],
+            ['{a TO b}', new Term(new RangeToken('{a TO b}', 0, '', 'a', 'b', 'exclusive'))],
+        ];
+    }
+
+    /**
+     * @param string $expected
+     * @param Node   $token
+     *
+     * @dataProvider visitDataprovider
+     */
+    public function testVisit($expected, $node)
+    {
+        $this->assertSame($expected, $this->visitor->visit($node));
+    }
+
+    public function testVisitUnknownTypeFails()
+    {
+        $this->expectException(\LogicException::class);
+        $node = new Term(new RangeToken('{a TO b}', 0, '', 'a', 'b', 'unknown'));
+        $this->visitor->visit($node);
+    }
+}