Added ArrayS::setJsonFormat

src/Structure/ArrayS.php

@@ -59,6 +59,38 @@ public function setFormat($format) {
         }
     }
 
+    /**
+     * Takes a string argument that can be either a valid JSON string, or
+     * a path to a file containing a valid JSON string. If the syntax is
+     * invalid or the file can't be accessed, an \Exception will be thrown
+     *
+     * @param string $format
+     * @return bool
+     * @throws \Exception
+     */
+    public function setJsonFormat($format) {
+        if (!is_string($format)) throw new \Exception("JsonFormat must be a valid json string or a path to a file");
+
+        if (file_exists($format)) {
+            $handler = fopen($format, 'r');
+            $contents = fread($handler, filesize($format));
+            fclose($handler);
+
+            $format = $contents;
+        }
+        $format = trim($format);
+
+        $arrayFormatCandidate = json_decode($format, true, 1024);
+
+        $error = json_last_error();
+        if ($error === JSON_ERROR_NONE) {
+            $this->setFormat($arrayFormatCandidate);
+            return true;
+        }
+
+        throw new \Exception("Invalid Json format or file");
+    }
+
     /**
      * Parses expressions matching /\[(\d+|\d*\+|\*)?\]/
      *

tests/ArrayJsonTest.php

@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * Created by PhpStorm.
+ * User: enric
+ * Date: 9/9/15
+ * Time: 12:47
+ */
+
+use \Structure\ArrayS;
+
+class ArrayJsonTest extends PHPUnit_Framework_TestCase {
+    public function testJsonStructure() {
+        $array = new ArrayS();
+        $array->setJsonFormat(__DIR__ . "/resources/testJsonStructure.json");
+
+        $res = $array->check(array(
+            "id" => 34,
+            "name" => "John",
+            "age" => 18,
+            "marks" => array(8, 7.6, 3, 1, 9, 0, 10, 9.8, 0.4, 4.5)
+        ));
+
+        $this->assertTrue($res);
+    }
+}

tests/resources/testJsonStructure.json

@@ -0,0 +1,6 @@
+{
+	"id": "integer[1,inf)",
+	"name":	"string(3..40)",
+	"age": "integer[0,120]",
+	"marks": "float[0,10][]"
+}