Improve float number handling and conversion (#4820)

Fixes #4739.

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

jerry-core/lit/lit-char-helpers.c

@@ -335,6 +335,35 @@ lit_char_is_binary_digit (ecma_char_t c) /** code unit */
 } /* lit_char_is_binary_digit */
 #endif /* JERRY_ESNEXT */
 
+/**
+ * @return radix value
+ */
+uint8_t
+lit_char_to_radix (lit_utf8_byte_t c) /** code unit */
+{
+  switch (LEXER_TO_ASCII_LOWERCASE (c))
+  {
+    case LIT_CHAR_LOWERCASE_X:
+    {
+      return 16;
+    }
+#if JERRY_ESNEXT
+    case LIT_CHAR_LOWERCASE_O:
+    {
+      return 8;
+    }
+    case LIT_CHAR_LOWERCASE_B:
+    {
+      return 2;
+    }
+#endif /* JERRY_ESNEXT */
+    default:
+    {
+      return 10;
+    }
+  }
+} /* lit_char_to_radix */
+
 /**
  * UnicodeEscape abstract method
  *
@@ -370,14 +399,9 @@ lit_char_hex_to_int (ecma_char_t c) /**< code unit, corresponding to
   {
     return (uint32_t) (c - LIT_CHAR_ASCII_DIGITS_BEGIN);
   }
-  else if (c >= LIT_CHAR_ASCII_LOWERCASE_LETTERS_HEX_BEGIN && c <= LIT_CHAR_ASCII_LOWERCASE_LETTERS_HEX_END)
-  {
-    return (uint32_t) (c - LIT_CHAR_ASCII_LOWERCASE_LETTERS_HEX_BEGIN + 10);
-  }
-  else
-  {
-    return (uint32_t) (c - LIT_CHAR_ASCII_UPPERCASE_LETTERS_HEX_BEGIN + 10);
-  }
+
+  const uint32_t hex_offset = 10 - (LIT_CHAR_LOWERCASE_A % 32);
+  return (c % 32) + hex_offset;
 } /* lit_char_hex_to_int */
 
 /**

jerry-core/lit/lit-char-helpers.h

@@ -229,6 +229,7 @@ bool lit_char_is_hex_digit (ecma_char_t c);
 #if JERRY_ESNEXT
 bool lit_char_is_binary_digit (ecma_char_t c);
 #endif /* JERRY_ESNEXT */
+uint8_t lit_char_to_radix (lit_utf8_byte_t c);
 void lit_char_unicode_escape (ecma_stringbuilder_t *builder_p, ecma_char_t c);
 uint32_t lit_char_hex_to_int (ecma_char_t c);
 size_t lit_code_point_to_cesu8_bytes (uint8_t *dst_p, lit_code_point_t code_point);