Merge pull request #60 from blazarecki/is-empty-expander

Add IsEmpty expander

Author: Norbert Orzechowicz

Diff for: README.md

@@ -53,6 +53,7 @@ $match = $matcher->match("lorem ipsum dolor", "@string@")
 * ``isEmail()``
 * ``isUrl()``
 * ``notEmpty()``
+* ``isEmpty()``
 * ``lowerThan($boundry)``
 * ``greaterThan($boundry)``
 * ``inArray($value)``

Diff for: src/Coduo/PHPMatcher/Matcher/Pattern/Expander/isEmpty.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Coduo\PHPMatcher\Matcher\Pattern\Expander;
+
+use Coduo\PHPMatcher\Matcher\Pattern\PatternExpander;
+use Coduo\ToString\StringConverter;
+
+/**
+ * @author Benjamin Lazarecki <benjamin.lazarecki@gmail.com>
+ */
+class isEmpty implements PatternExpander
+{
+    private $error;
+
+    /**
+     * @param mixed $value
+     *
+     * @return boolean
+     */
+    public function match($value)
+    {
+        if (!empty($value)) {
+            $this->error = sprintf("Value %s is not empty.", new StringConverter($value));
+
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * @return string|null
+     */
+    public function getError()
+    {
+        return $this->error;
+    }
+}

Diff for: src/Coduo/PHPMatcher/Parser/ExpanderInitializer.php

@@ -18,6 +18,7 @@ class ExpanderInitializer
         "startsWith" => "Coduo\\PHPMatcher\\Matcher\\Pattern\\Expander\\StartsWith",
         "endsWith" => "Coduo\\PHPMatcher\\Matcher\\Pattern\\Expander\\EndsWith",
         "notEmpty" => "Coduo\\PHPMatcher\\Matcher\\Pattern\\Expander\\NotEmpty",
+        "isEmpty" => "Coduo\\PHPMatcher\\Matcher\\Pattern\\Expander\\IsEmpty",
         "isDateTime" => "Coduo\\PHPMatcher\\Matcher\\Pattern\\Expander\\IsDateTime",
         "isEmail" => "Coduo\\PHPMatcher\\Matcher\\Pattern\\Expander\\IsEmail",
         "isUrl" => "Coduo\\PHPMatcher\\Matcher\\Pattern\\Expander\\IsUrl",

Diff for: tests/Coduo/PHPMatcher/Matcher/Pattern/Expander/isEmptyTest.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Coduo\PHPMatcher\Tests\Matcher\Pattern\Expander;
+
+use Coduo\PHPMatcher\Matcher\Pattern\Expander\isEmpty;
+
+/**
+ * @author Benjamin Lazarecki <benjamin.lazarecki@gmail.com>
+ */
+class isEmptyTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @dataProvider examplesProvider
+     */
+    public function test_is_empty_expander_match($value, $expectedResult)
+    {
+        $expander = new IsEmpty();
+        $this->assertEquals($expectedResult, $expander->match($value));
+    }
+
+    public static function examplesProvider()
+    {
+        return array(
+            array(array(), true),
+            array(array('data'), false),
+            array('', true),
+            array(0, true),
+            array(null, true),
+        );
+    }
+}

Diff for: tests/Coduo/PHPMatcher/MatcherTest.php

@@ -253,7 +253,10 @@ public static function expanderExamples()
             array(100, "@integer@.lowerThan(101).greaterThan(10)", true),
             array("", "@string@.notEmpty()", false),
             array("lorem ipsum", "@string@.notEmpty()", true),
+            array("", "@string@.isEmpty()", true),
             array(array("foo", "bar"), "@array@.inArray(\"bar\")", true),
+            array(array(), "@array@.isEmpty()", true),
+            array(array('foo'), "@array@.isEmpty()", false),
             array("lorem ipsum", "@string@.oneOf(contains(\"lorem\"), contains(\"test\"))", true),
             array("lorem ipsum", "@string@.oneOf(contains(\"lorem\"), contains(\"test\")).endsWith(\"ipsum\")", true),
         );