lib/string_exp/utf8_no_index: Added new constructor for UnicodeChar

Signed-off-by: Lucas Bajolet <r4pass@hotmail.com>

diff --git a/lib/string_experimentations/utf8_noindex.nit b/lib/string_experimentations/utf8_noindex.nit
index d34e051..fd544bf 100644 (file)
--- a/lib/string_experimentations/utf8_noindex.nit
+++ b/lib/string_experimentations/utf8_noindex.nit
@@ -31,6 +31,21 @@ in "C Header" `{
 # UTF-8 char as defined in RFC-3629, e.g. 1-4 Bytes
 extern class UnicodeChar `{ uint32_t* `}
 
+       # Transforms a byte-variable char* character to its uint32_t equivalent
+       new from_ns(ns: NativeString, index: Int) `{
+               unsigned char* ret = calloc(1,4);
+               if((ns[index] & 0x80) == 0){ memcpy(ret + 3, ns + index, 1);  }
+               else if((ns[index] & 0xE0) == 0xC0) { memcpy(ret + 2, ns + index, 2); }
+               else if((ns[index] & 0xF0) == 0xE0) { memcpy(ret + 1, ns + index, 3); }
+               else if((ns[index] & 0xF7) == 0xF0) { memcpy(ret, ns + index, 4); }
+               else{ memcpy(ret + 3, ns + index, 1);}
+               if (!IS_BIG_ENDIAN) {
+                       uint32_t tmp = ntohl(*((uint32_t*)ret));
+                       memcpy(ret, &tmp, 4);
+               }
+               return (uint32_t*)ret;
+       `}
+
        # Real length of the char in UTF8
        #
        # As per the specification :