String.prototype.trim() fixes and tests.

JerryScript-DCO-1.0-Signed-off-by: Laszlo Vidacs [email protected]

jerry-core/ecma/builtin-objects/ecma-builtin-string-prototype.cpp

@@ -14,7 +14,6 @@
  * limitations under the License.
  */
 
-#include <ctype.h>
 #include "ecma-alloc.h"
 #include "ecma-builtins.h"
 #include "ecma-conversion.h"
@@ -26,6 +25,7 @@
 #include "ecma-string-object.h"
 #include "ecma-try-catch-macro.h"
 #include "jrt.h"
+#include "jrt-libc-includes.h"
 
 #ifndef CONFIG_ECMA_COMPACT_PROFILE_DISABLE_STRING_BUILTIN
 
@@ -573,30 +573,32 @@ ecma_builtin_string_prototype_object_trim (ecma_value_t this_arg) /**< this argu
   /* 3 */
   const uint32_t len = (uint32_t) ecma_string_get_length (original_string_p);
 
+  /* Workaround: avoid repeated call of ecma_string_get_char_at_pos() because its overhead */
+  uint32_t zt_str_size = (uint32_t) sizeof (ecma_char_t) * (len + 1);
+  ecma_char_t *original_zt_str_p = (ecma_char_t*) mem_heap_alloc_block (zt_str_size,
+                                                                        MEM_HEAP_ALLOC_SHORT_TERM);
+  ecma_string_to_zt_string (original_string_p, original_zt_str_p, (ssize_t) zt_str_size);
+
   uint32_t prefix = 0, postfix = 0;
   uint32_t new_len = 0;
 
-  while (prefix < len &&
-         ecma_is_completion_value_empty (ret_value) &&
-         isspace (ecma_string_get_char_at_pos (original_string_p, prefix)))
+  while (prefix < len && isspace (original_zt_str_p[prefix]))
   {
     prefix++;
   }
 
-  while (postfix < len &&
-         ecma_is_completion_value_empty (ret_value) &&
-         isspace (ecma_string_get_char_at_pos (original_string_p, len-postfix-1)))
+  while (postfix < len - prefix && isspace (original_zt_str_p[len-postfix-1]))
   {
     postfix++;
   }
 
-  new_len = len - prefix - postfix;
+  new_len = prefix < len ? len - prefix - postfix : 0;
 
   MEM_DEFINE_LOCAL_ARRAY (new_str_buffer, new_len + 1, ecma_char_t);
 
   for (uint32_t idx = 0; idx < new_len; ++idx)
   {
-    new_str_buffer[idx] = ecma_string_get_char_at_pos (original_string_p, idx + prefix);
+    new_str_buffer[idx] = original_zt_str_p[idx + prefix];
   }
 
   new_str_buffer[new_len] = '\0';
@@ -607,6 +609,8 @@ ecma_builtin_string_prototype_object_trim (ecma_value_t this_arg) /**< this argu
 
   MEM_FINALIZE_LOCAL_ARRAY (new_str_buffer);
 
+  mem_heap_free_block (original_zt_str_p);
+
   ECMA_FINALIZE (to_string_val);
   ECMA_FINALIZE (check_coercible_val);
 

tests/jerry/string-prototype-trim.js

@@ -0,0 +1,69 @@
+// Copyright 2015 Samsung Electronics Co., Ltd.
+// Copyright 2015 University of Szeged.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// check properties
+assert(Object.getOwnPropertyDescriptor(String.prototype.trim, 'length').configurable === false);
+
+assert(Object.getOwnPropertyDescriptor(String.prototype.trim, 'length').enumerable === false);
+
+assert(Object.getOwnPropertyDescriptor(String.prototype.trim, 'length').writable === false);
+
+assert(String.prototype.trim.length === 0);
+
+// check this value
+assert(String.prototype.trim.call(new String()) === "");
+
+assert(String.prototype.trim.call({}) === "[object Object]");
+
+// check undefined
+try {
+  String.prototype.trim.call(undefined);
+  assert(false);
+} catch(e) {
+  assert(e instanceof TypeError);
+}
+
+// check null
+try {
+  String.prototype.trim.call(null);
+  assert(false);
+} catch(e) {
+  assert(e instanceof TypeError);
+}
+
+// simple checks
+assert(" hello world".trim() === "hello world");
+
+assert("hello world ".trim() === "hello world");
+
+assert("    hello world   ".trim() === "hello world");
+
+assert("\t  hello world\n".trim() === "hello world");
+
+assert("\t\n  hello world\t \n ".trim() === "hello world");
+
+assert("hello world\n   \t\t".trim() === "hello world");
+
+assert(" hello world \\ ".trim() === "hello world \\");
+
+assert("**hello world**".trim() === "**hello world**");
+
+assert(" \t \n".trim() === "");
+
+assert("          ".trim() === "");
+
+assert("".trim() === "");
+
+// FIXME: add unicode tests when unicode support available