Add new API function

Implemented 'jerry_is_array' and 'jerry_get_array_length' API functions.

JerryScript-DCO-1.0-Signed-off-by: László Langó llango.u-szeged@partner.samsung.com

Author: LaszloLango

jerry-core/jerry-api.h

@@ -185,6 +185,7 @@ jerry_string_t *jerry_create_string_sz (const jerry_char_t *, jerry_size_t);
  */
 bool jerry_set_array_index_value (jerry_object_t *, jerry_length_t, jerry_value_t);
 bool jerry_get_array_index_value (jerry_object_t *, jerry_length_t, jerry_value_t *);
+uint32_t jerry_get_array_length (const jerry_object_t *);
 
 /**
  * Functions of 'jerry_string_t'
@@ -196,6 +197,7 @@ jerry_size_t jerry_string_to_char_buffer (const jerry_string_t *, jerry_char_t *
 /**
  * General API functions of JS objects
  */
+bool jerry_is_array (const jerry_object_t *);
 bool jerry_is_constructor (const jerry_object_t *);
 bool jerry_is_function (const jerry_object_t *);
 bool jerry_add_object_field (jerry_object_t *, const jerry_char_t *, jerry_size_t, const jerry_value_t, bool);

jerry-core/jerry.c

@@ -590,6 +590,47 @@ jerry_get_array_index_value (jerry_object_t *array_obj_p, /**< array object */
   return false;
 } /* jerry_get_array_index_value */
 
+/**
+ * Get length of an array object
+ *
+ * @return length of the given array
+ */
+uint32_t
+jerry_get_array_length (const jerry_object_t *object_p)
+{
+  jerry_assert_api_available ();
+
+  JERRY_ASSERT (jerry_is_array (object_p));
+
+  jerry_length_t length = 0;
+  ecma_string_t *magic_string_length_p = ecma_get_magic_string (LIT_MAGIC_STRING_LENGTH);
+
+  ecma_value_t len_value = ecma_op_object_get ((jerry_object_t *) object_p, magic_string_length_p);
+  ecma_deref_ecma_string (magic_string_length_p);
+
+  ecma_number_t num_var = ecma_number_make_nan ();
+
+  if (ecma_is_value_number (len_value))
+  {
+    num_var = ecma_get_number_from_value (len_value);
+    length = ecma_number_to_uint32 (num_var);
+  }
+  else
+  {
+    ecma_value_t to_number_value = ecma_op_to_number (len_value);
+
+    if (!ECMA_IS_VALUE_ERROR (to_number_value))
+    {
+      num_var = ecma_get_number_from_value (to_number_value);
+      length = ecma_number_to_uint32 (num_var);
+    }
+  }
+
+  ecma_free_value (len_value);
+
+  return length;
+} /* jerry_get_array_length */
+
 /**
  * Create an error object
  *
@@ -757,6 +798,20 @@ jerry_dispatch_object_free_callback (ecma_external_pointer_t freecb_p, /**< poin
   jerry_make_api_available ();
 } /* jerry_dispatch_object_free_callback */
 
+/**
+ * Check if the specified object is an array object.
+ *
+ * @return true  - if the specified object is an array object,
+ *         false - otherwise.
+ */
+bool
+jerry_is_array (const jerry_object_t *object_p) /**< an object */
+{
+  jerry_assert_api_available ();
+
+  return (ecma_object_get_class_name ((jerry_object_t *) object_p) == LIT_MAGIC_STRING_ARRAY_UL);
+} /* jerry_is_array */
+
 /**
  * Check if the specified object is a function object.
  *

tests/unit/test-api.c

@@ -583,6 +583,8 @@ main (void)
 
   // Test: Array Object API
   jerry_object_t *array_obj_p = jerry_create_array_object (10);
+  JERRY_ASSERT (jerry_is_array (array_obj_p));
+  JERRY_ASSERT (jerry_get_array_length (array_obj_p) == 10);
 
   jerry_value_t v_in = jerry_create_number_value (10.5);
   jerry_set_array_index_value (array_obj_p, 5, v_in);