Added count pattern expander (#86)

Author: norberttech

src/Matcher/Pattern/Expander/Count.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace Coduo\PHPMatcher\Matcher\Pattern\Expander;
+
+use Coduo\PHPMatcher\Matcher\Pattern\PatternExpander;
+use Coduo\ToString\StringConverter;
+
+final class Count implements PatternExpander
+{
+    /**
+     * @var null|string
+     */
+    private $error;
+
+    /**
+     * @var
+     */
+    private $value;
+
+    /**
+     * @param $value
+     */
+    public function __construct($value)
+    {
+        $this->value = $value;
+    }
+
+    /**
+     * @param $value
+     * @return boolean
+     */
+    public function match($value)
+    {
+        if (!is_array($value)) {
+            $this->error = sprintf("Count expander require \"array\", got \"%s\".", new StringConverter($value));
+            return false;
+        }
+
+        if (count($value) !== $this->value) {
+            $this->error = sprintf("Expected count of %s is %s.", new StringConverter($value), new StringConverter($this->value));
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * @return string|null
+     */
+    public function getError()
+    {
+        return $this->error;
+    }
+}

src/Parser/ExpanderInitializer.php

@@ -25,6 +25,7 @@ final class ExpanderInitializer
         "lowerThan" => "Coduo\\PHPMatcher\\Matcher\\Pattern\\Expander\\LowerThan",
         "greaterThan" => "Coduo\\PHPMatcher\\Matcher\\Pattern\\Expander\\GreaterThan",
         "inArray" => "Coduo\\PHPMatcher\\Matcher\\Pattern\\Expander\\InArray",
+        "count" => "Coduo\\PHPMatcher\\Matcher\\Pattern\\Expander\\Count",
         "contains" => "Coduo\\PHPMatcher\\Matcher\\Pattern\\Expander\\Contains",
         "matchRegex" => "Coduo\\PHPMatcher\\Matcher\\Pattern\\Expander\\MatchRegex",
 

tests/Matcher/Pattern/Expander/CountTest.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace Coduo\PHPMatcher\Tests\Matcher\Pattern\Expander;
+
+use Coduo\PHPMatcher\Matcher;
+use Coduo\PHPMatcher\Matcher\Pattern\Expander\Count;
+
+class CountTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @dataProvider examplesProvider
+     */
+    public function test_matching_values($needle, $haystack, $expectedResult)
+    {
+        $expander = new Count($needle);
+        $this->assertEquals($expectedResult, $expander->match($haystack));
+    }
+
+    public static function examplesProvider()
+    {
+        return array(
+            array(1, array("ipsum"), true),
+            array(2, array("foo", 1), true),
+        );
+    }
+
+    /**
+     * @dataProvider invalidCasesProvider
+     */
+    public function test_error_when_matching_fail($boundary, $value, $errorMessage)
+    {
+        $expander = new Count($boundary);
+        $this->assertFalse($expander->match($value));
+        $this->assertEquals($errorMessage, $expander->getError());
+    }
+
+    public static function invalidCasesProvider()
+    {
+        return array(
+            array(2, array(1, 2, 3), "Expected count of Array(3) is 2."),
+            array(2, new \DateTime(), "Count expander require \"array\", got \"\\DateTime\"."),
+        );
+    }
+}

tests/MatcherTest.php

@@ -244,6 +244,8 @@ public static function expanderExamples()
             array(array("foo", "bar"), "@[email protected](\"bar\")", true),
             array(array(), "@[email protected]()", true),
             array(array('foo'), "@[email protected]()", false),
+            array(array(1, 2, 3), "@[email protected](3)", true),
+            array(array(1, 2, 3), "@[email protected](4)", false),
             array("lorem ipsum", "@[email protected](contains(\"lorem\"), contains(\"test\"))", true),
             array("lorem ipsum", "@[email protected](contains(\"lorem\"), contains(\"test\")).endsWith(\"ipsum\")", true),
             array("lorem ipsum", "@[email protected](\"/^lorem \\w+$/\")", true),