Implement UnicodeEscape abstract method (#3959)

Also refactored ecma_builtin_json_quote to use the method above JerryScript-DCO-1.0-Signed-off-by: Adam Szilagyi aszilagy@inf.u-szeged.hu
2020-07-20 13:51:06 +02:00
parent b162e27418
commit 33359ac506
4 changed files with 66 additions and 22 deletions
@@ -331,6 +331,26 @@ lit_char_is_binary_digit (ecma_char_t c) /** code unit */
 } /* lit_char_is_binary_digit */
 #endif /* ENABLED (JERRY_ESNEXT) */

+/**
+ * UnicodeEscape abstract method
+ *
+ * See also: ECMA-262 v10, 24.5.2.3
+ */
+void
+lit_char_unicode_escape (ecma_stringbuilder_t *builder_p, /**< stringbuilder to append */
+                         ecma_char_t c) /**< code unit to convert */
+{
+  ecma_stringbuilder_append_raw (builder_p, (lit_utf8_byte_t *) "\\u", 2);
+
+  for (int8_t i = 3; i >= 0; i--)
+  {
+    int32_t result_char = (c >> (i * 4)) & 0xF;
+    ecma_stringbuilder_append_byte (builder_p, (lit_utf8_byte_t) (result_char + (result_char <= 9
+                                                                                 ? LIT_CHAR_0
+                                                                                 : (LIT_CHAR_LOWERCASE_A - 10))));
+  }
+} /* lit_char_unicode_escape */
+
 /**
 * Convert a HexDigit character to its numeric value, as defined in ECMA-262 v5, 7.8.3
 *