Rework the public API (#4829)

Related to #4186.

Some notable changes:
  - The term 'Error' now strictly refers to native Error objects defined in
    the ECMA standard, which are ordinary objects. All other uses of
    'error' or 'error reference' where the term refers to a thrown value is
    now called 'exception'.

  - Simplified the naming scheme of many String API functions. These functions
    will now also take an 'encoding' argument to specify the desired
    encoding in which to operate.

  - Removed the substring-copy-to-buffer functions. These functions
    behaved awkwardly, as they use character index to specify the
    start/end positions, and were mostly used incorrectly with byte
    offsets instead. The functionality can still be replicated with
    other functions if necessary.

  - String-to-buffer functions will no longer fail if the buffer is not
    sufficiently large, the string will instead be cropped.

  - Fixed the usage of the '_sz' prefix in many API functions. The term
    'sz' means zero-terminated string in hungarian notation, this was
    used incorrectly in many cases.

  - Renamed most of the public API functions to have shorter, more on-point
    names, rather than the often too long descriptive names. Functions are now
    also grouped by the type of value they operate on, where this makes
    sense.

JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai dbatyai@inf.u-szeged.hu

tests/unit-ext/test-ext-module-canonical.c

@@ -26,36 +26,36 @@
 static jerry_value_t
 get_canonical_name (const jerry_value_t name)
 {
-  jerry_size_t name_size = jerry_get_string_size (name);
+  jerry_size_t name_size = jerry_string_size (name, JERRY_ENCODING_CESU8);
   JERRY_VLA (jerry_char_t, name_string, name_size + 1);
-  jerry_string_to_char_buffer (name, name_string, name_size);
+  jerry_string_to_buffer (name, JERRY_ENCODING_CESU8, name_string, name_size);
   name_string[name_size] = 0;
 
   if (!strcmp ((char *) name_string, ACTUAL_NAME))
   {
-    return jerry_acquire_value (name);
+    return jerry_value_copy (name);
   }
   else if (!strcmp ((char *) name_string, ALIAS_NAME))
   {
-    return jerry_create_string ((jerry_char_t *) ACTUAL_NAME);
+    return jerry_string_sz (ACTUAL_NAME);
   }
   else
   {
-    return jerry_create_undefined ();
+    return jerry_undefined ();
   }
 } /* get_canonical_name */
 
 static bool
 resolve (const jerry_value_t canonical_name, jerry_value_t *result)
 {
-  jerry_size_t name_size = jerry_get_string_size (canonical_name);
+  jerry_size_t name_size = jerry_string_size (canonical_name, JERRY_ENCODING_CESU8);
   JERRY_VLA (jerry_char_t, name_string, name_size + 1);
-  jerry_string_to_char_buffer (canonical_name, name_string, name_size);
+  jerry_string_to_buffer (canonical_name, JERRY_ENCODING_CESU8, name_string, name_size);
   name_string[name_size] = 0;
 
   if (!strcmp ((char *) name_string, ACTUAL_NAME))
   {
-    *result = jerry_create_object ();
+    *result = jerry_object ();
     return true;
   }
   return false;
@@ -76,28 +76,28 @@ main (int argc, char **argv)
 
   jerry_init (JERRY_INIT_EMPTY);
 
-  jerry_value_t actual_name = jerry_create_string ((jerry_char_t *) ACTUAL_NAME);
-  jerry_value_t alias_name = jerry_create_string ((jerry_char_t *) ALIAS_NAME);
+  jerry_value_t actual_name = jerry_string_sz (ACTUAL_NAME);
+  jerry_value_t alias_name = jerry_string_sz (ALIAS_NAME);
 
   /* It's important that we resolve by the non-canonical name first. */
   jerry_value_t result2 = jerryx_module_resolve (alias_name, &resolver, 1);
   jerry_value_t result1 = jerryx_module_resolve (actual_name, &resolver, 1);
-  jerry_release_value (actual_name);
-  jerry_release_value (alias_name);
+  jerry_value_free (actual_name);
+  jerry_value_free (alias_name);
 
   /* An elaborate way of doing strict equal - set a property on one object and it "magically" appears on the other. */
-  jerry_value_t prop_name = jerry_create_string ((jerry_char_t *) "something");
-  jerry_value_t prop_value = jerry_create_number (TEST_VALUE);
-  jerry_release_value (jerry_set_property (result1, prop_name, prop_value));
-  jerry_release_value (prop_value);
+  jerry_value_t prop_name = jerry_string_sz ("something");
+  jerry_value_t prop_value = jerry_number (TEST_VALUE);
+  jerry_value_free (jerry_object_set (result1, prop_name, prop_value));
+  jerry_value_free (prop_value);
 
-  prop_value = jerry_get_property (result2, prop_name);
-  TEST_ASSERT (jerry_get_number_value (prop_value) == TEST_VALUE);
-  jerry_release_value (prop_value);
+  prop_value = jerry_object_get (result2, prop_name);
+  TEST_ASSERT (jerry_value_as_number (prop_value) == TEST_VALUE);
+  jerry_value_free (prop_value);
 
-  jerry_release_value (prop_name);
-  jerry_release_value (result1);
-  jerry_release_value (result2);
+  jerry_value_free (prop_name);
+  jerry_value_free (result1);
+  jerry_value_free (result2);
 
   jerry_cleanup ();